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Arcteq AQ T3 Series Instruction Manual

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INSTRUCTION MANUAL
AQ T3xx
Transformer Protection IED

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Summary of Contents for Arcteq AQ T3 Series

  • Page 1 INSTRUCTION MANUAL AQ T3xx Transformer Protection IED...
  • Page 2 Instruction manual –AQ T3xx Transformer Protection IED 2 (165 Revision 1.00 Date November 2010 Changes The first revision. Revision 1.01 Date January 2011 Changes HW construction and application drawings revised Revision 1.02 Date February 2011 Changes AVR chapter added Synchrocheck chapter revised Voltage measurement module revised CPU module description added Binary input module description revised...
  • Page 3 Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. Local safety regulations should be followed. No responsibility is assumed by Arcteq for any consequences arising out of the use of this material. We reserve right to changes without further notice.

  • Page 4: Table Of Contents

    Instruction manual –AQ T3xx Transformer Protection IED 4 (165 TABLE OF CONTENTS 1 ABBREVIATIONS ......................7 2 GENERAL ......................... 8 3 SOFTWARE SETUP OF THE IED ..................9 Measurements ..................... 10 3.1.1 Current measurement and scaling .............. 10 3.1.2 Voltage measurement and scaling .............. 13 3.1.3 Connection example ...................
  • Page 5 Instruction manual –AQ T3xx Transformer Protection IED 5 (165 3.3.7 Switch on to fault logic ................120 3.3.8 Disturbance recorder ................123 3.3.9 Event recorder ..................124 3.3.10 Measured values ..................128 3.3.11 Status monitoring the switching devices ............ 129 3.3.12 Trip circuit supervision ................
  • Page 6 Instruction manual –AQ T3xx Transformer Protection IED 6 (165 7.1.4 Frequency protection functions ..............157 7.1.5 Other protection functions ................. 158 Control functions ....................159 Hardware ......................160 7.3.1 Power supply module ................160 7.3.2 Current measurement module ..............160 7.3.3 Voltage measurement module ..............

  • Page 7: Abbreviations

    Instruction manual –AQ T3xx Transformer Protection IED 7 (165 BBREVIATIONS CB – Circuit breaker CBFP – Circuit breaker failure protection CT – Current transformer CPU – Central processing unit EMC – Electromagnetic compatibility HMI – Human machine interface HW – Hardware IED –...

  • Page 8: General

    This manual describes the specific application of the AQ-T3xx transformer protection IEDs. Arcteq protection IED can be ordered in two mechanical sizes. The AQ-T35x comes in half of 19 inch rack arrangement and the AQ-T39x comes in full 19 inch rack arrangement...

  • Page 9: Software Setup Of The Ied

    Instruction manual –AQ T3xx Transformer Protection IED 9 (165 OFTWARE SETUP OF THE In this chapter are presented the protection and control functions as well as the monitoring functions. The implemented protection functions are listed in Table 3-1. The function blocks are described in details in following chapters.

  • Page 10: Measurements

    Instruction manual –AQ T3xx Transformer Protection IED 10 (165 Table 3-2 Available control and monitoring functions Name ANSI Description TRC94 Trip logic Voltage transformer supervision SYN25 SYNC Synchro-check function Δf, ΔU, Δφ Integrated voltage regulator (option) DREC Disturbance recorder EASUREMENTS 3.1.1 C URRENT MEASUREMENT AND SCALING If the factory configuration includes a current transformer hardware module, the current...
  • Page 11 Instruction manual –AQ T3xx Transformer Protection IED 11 (165 format and, naturally, accuracy. A small current is processed with finer resolution if 1A is selected. If needed, the phase currents can be inverted by setting the parameter Starpoint I1-3. This selection applies to each of the channels IL1, IL2 and IL3.
  • Page 12 Instruction manual –AQ T3xx Transformer Protection IED 12 (165 CT secondary 5A I0CT secondary 5A Phase currents are connected to summing “Holmgren” connection into the I0 residual input. The sampled values are available for further processing and for disturbance recording. The performed basic calculation results the Fourier basic harmonic magnitude and angle and the true RMS value.

  • Page 13: Voltage Measurement And Scaling

    Instruction manual –AQ T3xx Transformer Protection IED 13 (165 Table 3-5 Online measurements of the current input function NOTE1: The scaling of the Fourier basic component is such that if pure sinusoid 1A RMS of the rated frequency is injected, the displayed value is 1A. The displayed value does not depend on the parameter setting values “Rated Secondary”.
  • Page 14 Instruction manual –AQ T3xx Transformer Protection IED 14 (165 o True RMS value; provide the pre-calculated voltage values to the subsequent software modules, • deliver the calculated basic Fourier component values for on-line displaying. • The voltage input function block receives the sampled voltage values from the internal operating system.
  • Page 15 Instruction manual –AQ T3xx Transformer Protection IED 15 (165 Ph-N Voltage: Residual voltage: Rated Primary U1-3: 11.55kV (=20kv/√3) Rated Primary U4: 11.54A Range: Type 100 If phase-to-phase voltage is connected to the VT input of the device, then the Ph-Ph option is to be selected.
  • Page 16 Instruction manual –AQ T3xx Transformer Protection IED 16 (165 These modified sampled values are available for further processing and for disturbance recording. The function block also provides parameters for setting the primary rated voltages of the main voltage transformers. This function block does not need that parameter setting but these values are passed on to function blocks such as displaying primary measured values, primary power calculation, etc.
  • Page 17 Instruction manual –AQ T3xx Transformer Protection IED 17 (165 Table 3-9 On-line measured analogue values of the voltage input function NOTE1: The scaling of the Fourier basic component is such if pure sinusoid 57V RMS of the rated frequency is injected, the displayed value is 57V. The displayed value does not depend on the parameter setting values “Rated Secondary”.

  • Page 18: Connection Example

    Instruction manual –AQ T3xx Transformer Protection IED 18 (165 3.1.3 C ONNECTION EXAMPLE Figure 3-5 Connection example with current breaker open and close connection, CT and VT connection.
  • Page 19 Instruction manual –AQ T3xx Transformer Protection IED 19 (165 Figure 3-6 Example connection with two CT:s facing each other. Starpoint directions are both set to “Line”.
  • Page 20 Instruction manual –AQ T3xx Transformer Protection IED 20 (165 Figure 3-7 Connection example where the direction of the secondary sides starpoint direction has been inverted. Notice the inverted parameter Starpoint I1-3: “Bus”.

  • Page 21: Line Measurement

    Instruction manual –AQ T3xx Transformer Protection IED 21 (165 3.1.4 L INE MEASUREMENT The input values of the AQ300 devices are the secondary signals of the voltage transformers and those of the current transformers. These signals are pre-processed by the “Voltage transformer input” function block and by the “Current transformer input”...
  • Page 22 Instruction manual –AQ T3xx Transformer Protection IED 22 (165 NOTE: the scaling values are entered as parameter setting for the “Voltage transformer input” function block and for the “Current transformer input” function block. 3.1.4.3 Measured values The measured values of the line measurement function depend on the hardware configuration.
  • Page 23 Instruction manual –AQ T3xx Transformer Protection IED 23 (165 Figure 3-8 Measured values in a configuration for compensated networks The available quantities are described in the configuration description documents. 3.1.4.4 Reporting the measured values and the changes For reporting, additional information is needed, which is defined in parameter setting. As an example, in a configuration for solidly grounded networks the following parameters are available:...
  • Page 24 Instruction manual –AQ T3xx Transformer Protection IED 24 (165 Table 3-11 The enumerated parameters of the line measurement function. The selection of the reporting mode items is explained in next chapters. 3.1.4.5 “Amplitude” mode of reporting If the “Amplitude” mode is selected for reporting, a report is generated if the measured value leaves the deadband around the previously reported value.
  • Page 25 Instruction manual –AQ T3xx Transformer Protection IED 25 (165 Table 3-12 The floating-point parameters of the line measurement function...
  • Page 26 Instruction manual –AQ T3xx Transformer Protection IED 26 (165 Figure 3-9 Reporting if “Amplitude” mode is selected 3.1.4.6 “Integral” mode of reporting If the “Integrated” mode is selected for reporting, a report is generated if the time integral of the measured value since the last report gets becomes larger, in the positive or negative direction, then the (deadband*1sec) area.
  • Page 27 Instruction manual –AQ T3xx Transformer Protection IED 27 (165 Figure 3-10 Reporting if “Integrated” mode is selected 3.1.4.7 Periodic reporting Periodic reporting is generated independently of the changes of the measured values when the defined time period elapses. Table 3-13 The integer parameters of the line measurement function If the reporting time period is set to 0, then no periodic reporting is performed for this quantity.

  • Page 28: Protection Functions

    Instruction manual –AQ T3xx Transformer Protection IED 28 (165 ROTECTION UNCTIONS 3.2.1 T > (87T) RANSFORMER DIFFERENTIAL The differential protection function provides main protection for transformers, generators or large motors, but it can also be applied for overhead lines and cables of solidly grounded networks or for the protection of any combination of the aforementioned protected objects.
  • Page 29 Instruction manual –AQ T3xx Transformer Protection IED 29 (165 Status signals The outputs of the function are: Binary output status signals Measured values for displaying The software modules of the differential protection function: Vector group: This module compensates the phase shift and turns ratio of the transformer. The results of this calculation are the “sampled values”...
  • Page 30 Instruction manual –AQ T3xx Transformer Protection IED 30 (165 Differential characteristics: This module performs the necessary calculations for the evaluation of the “percentage differential characteristics”. The result of this calculation is needed for the decision logic. Decision logic: The decision logic module decides if the differential current of the individual phases is above the characteristic curve of the differential protection function.
  • Page 31 Instruction manual –AQ T3xx Transformer Protection IED 31 (165 sequence current component, the differential protection generates a trip command in case of an external ground fault. If, however, the connection group of the current transformers on the Y side is delta, no zero sequence current flows out of the group. Thus the problem of zero sequence current elimination in case of an external ground fault is solved.
  • Page 32 Instruction manual –AQ T3xx Transformer Protection IED 32 (165 Table 3-14 Vector shift compensation with transformation to the delta side. Table 3-15 Vector shift compensation with transformation to the delta side...
  • Page 33 Instruction manual –AQ T3xx Transformer Protection IED 33 (165 The differential currents are calculated using the (RSTshift) values and the (TR primary) and (TR secondary) parameters, defined by the turns ratio of the transformer and that of the current transformers, resulting in the currents marked with an apostrophe (’). The tertiary...
  • Page 34 Instruction manual –AQ T3xx Transformer Protection IED 34 (165 side is processed similarly. (The positive direction of the currents is flowing IN on both sides.) The current measuring software modules process these momentary values of the differential currents and calculate values that are proportional to the RMS values. Operation with the zero sequence current in case of a phase-to-ground fault on the delta side On the secondary side of a high voltage /medium voltage transformer which is connected...
  • Page 35 Instruction manual –AQ T3xx Transformer Protection IED 35 (165 The differential current can be high in case of the over-excitation of the transformer due to the current distortion caused by the transformer iron core symmetrical saturation. In this case, the fifth harmonic content of the differential current is applied to disable the operation of the differential protection function.
  • Page 36 Instruction manual –AQ T3xx Transformer Protection IED 36 (165 This module evaluates the differential characteristics. It compares the magnitudes of the differential currents and those of the restraint currents. The restraint currents are calculated using the following formulas: Based on these values (generally denoted as “Ires”) and the values of the differential current magnitudes (generally denoted as “Id”), the differential protection characteristics is shown in following figure.
  • Page 37 Instruction manual –AQ T3xx Transformer Protection IED 37 (165 If the calculated differential current is very high, then the differential characteristic is not considered anymore because the separate status signals for the phases are set to “true” value if the differential currents in the individual phases are above the limit defined by parameter setting.
  • Page 38 Instruction manual –AQ T3xx Transformer Protection IED 38 (165 Yy0,Yy6,Yd1, Yd5,Yd7,Yd11, Yz1,Yz5,Yz7, Yz11 ZeroSequ.Elimination True Selection of the zero sequence current elimination. False Default setting is True. TR Primary comp. 20…500 % by step Parameters for the current magnitude compensation. TR Secondary comp.
  • Page 39 Instruction manual –AQ T3xx Transformer Protection IED 39 (165 1.1.1.1 Example setting calculation for AQ-300 IED differential protection As an example the transformer data: Sn = 125 MVA U1/U2 = 132/11.5 kV/kV Yd11 Current transformer: CT1 600/1 A/A • CT2 6000/1 A/A •...

  • Page 40: Restricted Earth Fault Ref (87N)

    Instruction manual –AQ T3xx Transformer Protection IED 40 (165 1.1.1.2 Fixed trip assignment into trip logic To ensure fast tripping required from differential functions the trip signal always has a factory fixed connection to the TRC94 trip logic blocks. See the picture of logic mentioning this. Figure 3-4.
  • Page 41 Instruction manual –AQ T3xx Transformer Protection IED 41 (165 Figure 3-5 Structure of the restricted earth fault protection algorithm. The inputs for the preparation are the sampled values of three primary phase currents, the sampled value of the neutral current. The outputs of the preparation are the RMS values of the fundamental Fourier components of the phase currents and that of the neutral current.
  • Page 42 Instruction manual –AQ T3xx Transformer Protection IED 42 (165 Directional decision: This module compares the direction of the neutral current and that of the calculated zero sequence current. In case of small zero sequence components of the high fault currents in the phases, this decision improves the stability of the function. Differential characteristics: This module performs the necessary calculations for the evaluation of the “percentage differential characteristics”...
  • Page 43 Instruction manual –AQ T3xx Transformer Protection IED 43 (165 Figure 3-7 Principal scheme of directional decision. The zero sequence differential characteristics This module performs the necessary calculations for the evaluation of the “percentage differential characteristics”, and decides if the differential current is above the characteristic curve of the zero sequence differential protection function.

  • Page 44: Three-Phase Instantaneous Overcurrent I>>> (50)

    Instruction manual –AQ T3xx Transformer Protection IED 44 (165 function is not blocked and the operation of the function is enabled by parameter setting. Blocking can be caused by the directional decision if it is enabled by parameter setting and the angle of the currents is in the blocking area or the user has composed a blocking graphic equation, and the conditions result a TRUE value for the blocking.
  • Page 45 Instruction manual –AQ T3xx Transformer Protection IED 45 (165 Figure 11: Operating characteristics of the instantaneous overcurrent protection function, where tOP (seconds) Theoretical operating time if G> GS (without additional time delay), Measured peak value or Fourier base harmonic of the phase currents Pick-up setting value The structure of the algorithm consists of following modules.
  • Page 46 Instruction manual –AQ T3xx Transformer Protection IED 46 (165 Figure 12: Structure of the instantaneous overcurrent algorithm. The algorithm generates a trip command without additional time delay based on the Fourier components of the phase currents or peak values of the phase currents in case if the user set pick-up value is exceeded.

  • Page 47: Residual Instantaneous Overcurrent I0>>> (50N)

    Instruction manual –AQ T3xx Transformer Protection IED 47 (165 3.2.4 R I0>>> (50N) ESIDUAL INSTANTANEOUS OVERCURRENT The residual instantaneous overcurrent protection function operates according to instantaneous characteristics, using the residual current (IN=3Io). The setting value is a parameter, and it can be doubled with dedicated input binary signal. The basic calculation can be based on peak value selection or on Fourier basic harmonic calculation, according to the parameter setting.

  • Page 48: Three-Phase Time Overcurrent I>, I>> (50/51)

    Instruction manual –AQ T3xx Transformer Protection IED 48 (165 Figure 14: Structure of the instantaneous residual overcurrent algorithm. The algorithm generates a trip command without additional time delay based on the Fourier components of the phase currents or peak values of the phase currents in case if the user set pick-up value is exceeded.
  • Page 49 Instruction manual –AQ T3xx Transformer Protection IED 49 (165 In the figure below is presented the structure of the time overcurrent algorithm. Figure 3-15 Structure of the time overcurrent algorithm. The algorithm generates a start signal based on the Fourier components of the phase currents or peak values of the phase currents in case if the user set pick-up value is exceeded.
  • Page 50 Instruction manual –AQ T3xx Transformer Protection IED 50 (165 Pick-up setting value IDMT operating characteristics depend on the selected curve family and curve type. All of the available IDMT characteristics follow Equation 3-1 IDMT characteristics equation. t(G)(seconds) Theoretical operate time with constant value of G k, c constants characterizing the selected curve α...
  • Page 51 Instruction manual –AQ T3xx Transformer Protection IED 51 (165 Table 3-20 Parameters and operating curve types for the IDMT characteristics. In following figures the characteristics of IDMT curves are presented with minimum and maximum pick-up settings in respect of the IED measuring range.
  • Page 52 Instruction manual –AQ T3xx Transformer Protection IED 52 (165 Figure 3-17: IEC Normally Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 53 Instruction manual –AQ T3xx Transformer Protection IED 53 (165 Figure 3-18: IEC Very Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 54 Instruction manual –AQ T3xx Transformer Protection IED 54 (165 Figure 3-19: IEC Extremely Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 55 Instruction manual –AQ T3xx Transformer Protection IED 55 (165 Figure 3-20: IEC Long Time Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 56 Instruction manual –AQ T3xx Transformer Protection IED 56 (165 Figure 3-21: ANSI/IEEE Normally Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 57 Instruction manual –AQ T3xx Transformer Protection IED 57 (165 Figure 3-22: ANSI/IEEE Moderately Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 58 Instruction manual –AQ T3xx Transformer Protection IED 58 (165 Figure 3-23: ANSI/IEEE Very Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 59 Instruction manual –AQ T3xx Transformer Protection IED 59 (165 Figure 3-24: ANSI/IEEE Extremely Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 60 Instruction manual –AQ T3xx Transformer Protection IED 60 (165 Figure 3-25: ANSI/IEEE Long Time Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 61 Instruction manual –AQ T3xx Transformer Protection IED 61 (165 Figure 3-26: ANSI/IEEE Long Time Very Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20.
  • Page 62 Instruction manual –AQ T3xx Transformer Protection IED 62 (165 Figure 3-27: ANSI/IEEE Long Time Extremely Inverse operating curves with minimum and maximum pick up settings and TMS settings from 0.05 to 20. Resetting characteristics for the function depends on the selected operating time characteristics.
  • Page 63 Instruction manual –AQ T3xx Transformer Protection IED 63 (165 tr(G)(seconds) Theoretical reset time with constant value of G constants characterizing the selected curve α constants characterizing the selected curve measured value of the Fourier base harmonic of the phase currents pick-up setting TMS Time dial setting / preset time multiplier The parameters and operating curve types follow corresponding standards presented in the...

  • Page 64: Residual Time Overcurrent I0>, I0>> (51N)

    Instruction manual –AQ T3xx Transformer Protection IED 64 (165 Table 3-22: Setting parameters of the time overcurrent function Parameter Setting value, range Description and step Operation Operating mode selection of the function. Can be disabled, DefinitTime Definite time or IDMT operation based into IEC or ANSI/IEEE IEC Inv standards.
  • Page 65 Instruction manual –AQ T3xx Transformer Protection IED 65 (165 Figure 3-28: Operating characteristics of the residual time overcurrent protection function. tOP (seconds) Theoretical operating time if G> GS (without additional time delay), Measured value of the Fourier base harmonic of the residual current Pick-up setting The structure of the algorithm consists of following modules.

  • Page 66: Current Unbalance (60)

    Instruction manual –AQ T3xx Transformer Protection IED 66 (165 The function includes a blocking signal input which can be configured by user from either IED internal binary signals or IED binary inputs through the programmable logic. Table 3-23: Setting parameters of the residual time overcurrent function Parameter Setting value, range Description...
  • Page 67 Instruction manual –AQ T3xx Transformer Protection IED 67 (165 Figure 3-30: Structure of the current unbalance protection algorithm. The analogue signal processing principal scheme is presented in the figure below. Figure 3-31: Analogue signal processing for the current unbalance function. The signal processing compares the difference between measured current magnitudes.

  • Page 68: Thermal Overload T>, (49L)

    Instruction manual –AQ T3xx Transformer Protection IED 68 (165 The trip command is generated after the set defined time delay. Table 3-24: Setting parameters of the current unbalance function Parameter Setting value, range Description and step Operation Selection for the function enabled or disabled. Default setting is “On”...
  • Page 69 Instruction manual –AQ T3xx Transformer Protection IED 69 (165 Figure 3-9. The principal structure of the thermal overload function. In the Figure 3-9 is presented the principal structure of the thermal overload function. The inputs of the function are the maximum of TRMS values of the phase currents, ambient temperature setting, binary input status signals and setting parameters.

  • Page 70: Over Voltage U>, U>> (59)

    Instruction manual –AQ T3xx Transformer Protection IED 70 (165 In the table below are presented the setting parameters for the thermal overload function. Temperature degrees in the table are presented in Celsius temperature scale. Table 3-25: Setting parameters of the thermal overload function Parameter Setting value, range Description...

  • Page 71: Under Voltage U<, U<< (27)

    Instruction manual –AQ T3xx Transformer Protection IED 71 (165 Figure 3-32: The principal structure of the overvoltage function. The general start signal is set active if the voltage in any of the three measured voltages is above the level defined by pick-up setting value. The function generates a trip command after the definite time delay has elapsed.
  • Page 72 Instruction manual –AQ T3xx Transformer Protection IED 72 (165 Figure 3-33: The principal structure of the undervoltage function. The general start signal is set active if the voltage of any of the three measured voltages is below the level defined by pick-up setting value. The function generates a trip command after the definite time delay has elapsed.

  • Page 73: Residual Over Voltage U0>, U0>> (59N)

    Instruction manual –AQ T3xx Transformer Protection IED 73 (165 3.2.11 R U0>, U0>> (59N) ESIDUAL OVER VOLTAGE The residual definite time overvoltage protection function operates according to definite time characteristics, using the RMS values of the fundamental Fourier component of the zero sequence voltage (UN=3Uo).

  • Page 74: Over Frequency F>, F>>, (81O)

    Instruction manual –AQ T3xx Transformer Protection IED 74 (165 3.2.12 O >, >>, (81O) VER FREQUENCY F The deviation of the frequency from the rated system frequency indicates unbalance between the generated power and the load demand. If the available generation is large compared to the consumption by the load connected to the power system, then the system frequency is above the rated value.

  • Page 75: Under Frequency F<, F<<, (81U)

    Instruction manual –AQ T3xx Transformer Protection IED 75 (165 Table 3-29 Setting parameters of the over frequency protection function Parameter Setting value, range Description and step Operation Operating mode selection for the function. Operation can be either disabled “Off” or enabled “On”. Default setting is enabled.

  • Page 76: Rate Of Change Of Frequency Df/Dt>, Df/Dt>> (81R)

    Instruction manual –AQ T3xx Transformer Protection IED 76 (165 Table 3-30: Setting parameters of the under-frequency function Parameter Setting value, range Description and step Operation Operating mode selection for the function. Operation can be either disabled “Off” or enabled “On”. Default setting is enabled.

  • Page 77: Over Excitation V/Hz (24)

    Instruction manual –AQ T3xx Transformer Protection IED 77 (165 30% of the rated voltage value. The rate of change of frequency protection function generates a start signal if the df/dt value is above the setting vale. The rate of change of frequency is calculated as the difference of the frequency at the present sampling and at three cycles earlier.
  • Page 78 Instruction manual –AQ T3xx Transformer Protection IED 78 (165 Note: the overexcitation protection function is intended to be applied near the generator, where the voltage is expected to be pure sinusoidal, without any distortion. Therefore, a continuous integration of the voltage and a simple peak detection algorithm can be applied. The effect of high flux values is the symmetrical saturation of the iron core of the generator or that of the unit transformer.
  • Page 79 Instruction manual –AQ T3xx Transformer Protection IED 79 (165 characteristic is of inverse type (so called IEEE type): If the overexcitation increases, the operating time decreases. To meet the requirements of application, a definite-time characteristic is also offered in this protection function as an alternative. The supervised quantity is the calculated U/f value as a percentage of the nominal values (index N): The over-dimensioning of generators in this respect is usually about 5%, that of the transformer...
  • Page 80 Instruction manual –AQ T3xx Transformer Protection IED 80 (165 Reset time...
  • Page 81 Instruction manual –AQ T3xx Transformer Protection IED 81 (165 Figure 3-36: IEEE standard dependent time characteristics The maximum delay time is limited by the parameter VPH24_MaxDel_TPar_ (Max.Time Delay). This time delay is valid if the flux is above the preset value VPH24_EmaxCont_IPar_ (Start U/f LowSet).
  • Page 82 Instruction manual –AQ T3xx Transformer Protection IED 82 (165 Figure 3-37: IEEE standard dependent time characteristics (enlarged) This inverse type characteristic is also combined with a minimum time delay, the value of which is set by user parameter VPH24_MinDel_TPar_ (Min. Time Delay). This time delay is valid if the flux is above the setting value VPH24_Emax_IPar_ (Start U/f HighSet).
  • Page 83 Instruction manual –AQ T3xx Transformer Protection IED 83 (165 As overexcitation is a phenomenon which is typical if the generator or the generator transformer unit is not connected to the network, the voltage drop does not need any compensation. If the voltage is measured at the supply side of the unit transformer, then the voltage is higher then the voltage of the magnetization branch of the transformer’s equivalent circuit.
  • Page 84 Instruction manual –AQ T3xx Transformer Protection IED 84 (165 Flux saturation This module integrates the voltage to obtain the flux time-function and determines the magnitude of the flux. Figure 3-39: Principal scheme of the flux calculation The inputs are the sampled values of a line-to-line voltage (ULL). The output is the magnitude of the flux (FluxMagn), internal signal.

  • Page 85: Breaker Failure Protection Function Cbfp, (50Bf)

    Instruction manual –AQ T3xx Transformer Protection IED 85 (165 Binary status signals Figure 3-41: The function block of the overexcitation protection function Table 3-32: Setting parameters of the df/dt function Parameter Setting value, range Description and step Operation Operating mode selection for the function. Operation can be either disabled “Off”...
  • Page 86 Instruction manual –AQ T3xx Transformer Protection IED 86 (165 The starting signal of the breaker failure protection function is usually the trip command of any other protection function defined by the user. Dedicated timers start at the rising edge of the start signals, one for the backup trip command and one for the repeated trip command, separately for operation in the individual phases.
  • Page 87 Instruction manual –AQ T3xx Transformer Protection IED 87 (165 Figure 3-42: Operation logic of the CBFP function Table 3-33: Setting parameters of the CBFP function Parameter Setting value, range Description and step Operation Operating mode selection for the function. Operation can be Current either disabled “Off”...

  • Page 88: Inrush Current Detection (Inr2), (68)

    Instruction manual –AQ T3xx Transformer Protection IED 88 (165 3.2.17 I (INR2), (68) NRUSH CURRENT DETECTION The current can be high during transformer energizing due to the current distortion caused by the transformer iron core asymmetrical saturation. In this case, the second harmonic content of the current is applied to disable the operation of the desired protection function(s).
  • Page 89 Instruction manual –AQ T3xx Transformer Protection IED 89 (165 • The device is booting while the protection functions are operable • No time synchron signal is received • There are some setting errors such as the rated frequency setting does not correspond to the measured frequency, mismatch in vector group setting in case of transformer with three voltage levels, etc.
  • Page 90 Instruction manual –AQ T3xx Transformer Protection IED 90 (165 5. FixFalse/True can be used to write continuous 0 or 1 into an input of a function block or a logic gate. The Common function block has binary input signals. The conditions are defined by the user applying the graphic logic editor.

  • Page 91: Trip Logic (94)

    Instruction manual –AQ T3xx Transformer Protection IED 91 (165 Table 3-36: The binary input status of the common function block The Common function block has a single Boolean parameter. The role of this parameter is to enable or disable the external setting of the Local/Remote state. Table 3-37: Setting parameters of the Common function Parameter Setting value, range...
  • Page 92 Instruction manual –AQ T3xx Transformer Protection IED 92 (165 Figure 3-10 Operation logic of the trip logic function. The trip requirements can be programmed by the user. The aim of the decision logic is to define a minimal impulse duration even if the protection functions detect a very short-time fault.
  • Page 93 Instruction manual –AQ T3xx Transformer Protection IED 93 (165 Figure 3-12 Trip logic block #1 has been assigned as HV side trip to activate trip contact E02. Trip logic block #2 has been assigned as MV side trip to activate trip contact E04. The trip contact assignments can be modified or the same trip logic can activate multiple contacts by adding a new trip assignment.

  • Page 94: Voltage Transformer Supervision Vts (60)

    Instruction manual –AQ T3xx Transformer Protection IED 94 (165 Table 3-38 Setting parameters of the trip logic function Parameter Setting value, range Description and step Operation Operating mode selection for the function. Operation can be either disabled “Off” or enabled “On”. Default setting is enabled. Min pulse 50…60000 ms by Minimum duration of the generated tripping impulse.
  • Page 95 Instruction manual –AQ T3xx Transformer Protection IED 95 (165 The voltage transformer supervision function can be triggered if “Live line” status is detected for at least 200 ms. The purpose of this delay is to avoid mal-operation at line energizing if the poles of the circuit breaker make contact with a time delay.
  • Page 96 Instruction manual –AQ T3xx Transformer Protection IED 96 (165 The voltage transformer supervision logic operates through decision logic presented in the following figure. Figure 3-45: Decision logic of the voltage transformer supervision function. NOTE: For the operation of the voltage transformer supervision function the “ Dead line detection function”...

  • Page 97: Current Transformer Supervision (Cts)

    Instruction manual –AQ T3xx Transformer Protection IED 97 (165 Table 3-39 The binary input signal of the voltage transformer supervision function Binary status signal Explanation Output status defined by the user to disable the voltage transformer VTS_Blk_GrO_ supervision function Table 3-40The binary output signal of the voltage transformer supervision function Binary status signal Title Explanation...
  • Page 98 Instruction manual –AQ T3xx Transformer Protection IED 98 (165 The function can be disabled by parameter setting, and by an input signal programmed by the user. The failure signal is generated after the defined time delay. The function block of the current transformer supervision function is shown in figure bellow. This block shows all binary input and output status signals that are applicable in the AQtivate 300 software.

  • Page 99: Synchrocheck Du/Df (25)

    Instruction manual –AQ T3xx Transformer Protection IED 99 (165 3.3.5 S (25) YNCHROCHECK DU Several problems can occur in the power system if the circuit breaker closes and connects two systems operating asynchronously. The high current surge can cause damage in the interconnecting elements, the accelerating forces can overstress the shafts of rotating machines or the actions taken by the protective system can result in the eventual isolation of parts of the power system.
  • Page 100 Instruction manual –AQ T3xx Transformer Protection IED 100 (165 The function processes the signals of the voltage transformer supervision function and enables the close command only in case of plausible voltages. The synchrocheck function monitors three modes of conditions: • Energizing check: •...
  • Page 101 Instruction manual –AQ T3xx Transformer Protection IED 101 (165 RelA SwStA SYN25_Eva CancelA (aut) SynSWA InProgA UlineFour(3ph) UOKA FrOKA Ubus1Four AngOKA Ubus2Four SYN25_Com Bus Sel VTS Blk RelM Bus1 VTS Blk Bus2 VTS Blk SYN25_Eva (man) SynSWM InProgM SwStM UOKM CancelM FrOKM AngOKM...
  • Page 102 Instruction manual –AQ T3xx Transformer Protection IED 102 (165 SYN25_Com -U_diff UlineFour (3ph) Calc -f_diff Ubus1Four U_bus -fi_ diff Ubus2Four -U_bus -U_line BusSel 1000ms VTS Blk Bus1 VTS Blk U_bus Bus2 VTS Blk Parameters Figure 3-49: Synchrocheck common difference calculation function structure. If the active bus section changes the function is dynamically blocked for 1000ms and no release signal or switching command is generated.
  • Page 103 Instruction manual –AQ T3xx Transformer Protection IED 103 (165 Figure 3-50: Synchrocheck evaluation function structure. This evaluation software block is used for two purposes: for the automatic reclosing command (the signal names have the suffix “A”) and for the manual close request (the signal names have the suffix “M”).
  • Page 104 Instruction manual –AQ T3xx Transformer Protection IED 104 (165 possible if: the voltage difference is within the defined limits (Udiff SynSW Auto /Manual)) the frequency difference is within the defined limits (FrDiff SynSW Auto). These parameters are independent of those for the synchro check function. If the conditions for synchro check are not fulfilled and the conditions for synchro switch are OK, then the relative rotation of the voltage vectors is monitored.
  • Page 105 Instruction manual –AQ T3xx Transformer Protection IED 105 (165 Table 3-45 The binary input signal of the synchro check / synchro switch function Binary status signal Title Explanation If this signal is logic TRUE, then the voltage SYN25_BusSel_GrO_ Bus Select of Bus2 is selected for evaluation Blocking signal of the voltage transformer supervision function evaluating the line...
  • Page 106 Instruction manual –AQ T3xx Transformer Protection IED 106 (165 Table 3-46 The binary output status signals of the synchro check / synchro switch function Binary status signal Title Explanation Releasing the close command initiated by SYN25_RelA_GrI_ Release Auto the automatic reclosing function Switching procedure is in progress, initiated by the automatic reclosing SYN25_InProgA_GrI_...
  • Page 107 Instruction manual –AQ T3xx Transformer Protection IED 107 (165 Table 3-47 Setting parameters of the synchro check / synchro switch function Parameter Setting value, range Description and step Voltage select L1-N Reference voltage selection. The function will monitor the L2-N selected voltage for magnitude, frequency and angle L3-N differences.

  • Page 108: Integrated Automatic Voltage Regulator (Avr)

    Instruction manual –AQ T3xx Transformer Protection IED 108 (165 FrDiff SynSW 0.10…1.00 Hz by Frequency difference checking of the automatic synchroswitch Auto step of 0.01 Hz mode. If the measured phase difference is below this setting the condition applies. Default setting is 0.2 Hz. Operation Man Operation mode for manual switching.
  • Page 109 Instruction manual –AQ T3xx Transformer Protection IED 109 (165 The voltage control function can be performed automatically or, in manual mode of operation, the personnel of the substation can set the network voltage according to special requirements. Depending on the selected mode of operation this version of the controller can be applied to regulate a single transformer or to control parallel transformers.
  • Page 110 Instruction manual –AQ T3xx Transformer Protection IED 110 (165 UL1L2 Line-to-line voltage of the controlled secondary side of the transformer IL1L2 Difference of the selected line currents of the secondary side of the transformer for voltage drop compensation Maximum of the phase currents of the primary side of the transformer for limitation purposes The parameter “U Correction”...
  • Page 111 Instruction manual –AQ T3xx Transformer Protection IED 111 (165 Figure 3-52 The logic schema of the automatic tap changer controller 3.3.6.5 Automatic control mode Voltage compensation in automatic control mode The module “AUT” in Figure 3-52 gets the Fourier components of the busbar voltage and those of the current: UL1L2 and UL1L2...
  • Page 112 Instruction manual –AQ T3xx Transformer Protection IED 112 (165 If the parameter “Compensation” is set to “AbsoluteComp”, the calculation method • is as follows: In this simplified method the vector positions are not considered correctly, the formula above is approximated with the magnitudes only: |Ucontrol|=|Ubus-Udrop|≈|Ubus|-|Udrop|≈|Ubus|-|I|*(R)CompoundFactor , where (R) Compound Factor is a parameter value.
  • Page 113 Instruction manual –AQ T3xx Transformer Protection IED 113 (165 The method is based on the estimated complex impedance between the busbar and the “load center”. The parameter “(R) Compound Factor” means in this case the voltage drop in percent, caused by the real component of the rated current. The parameter “X Compound Factor”...
  • Page 114 Instruction manual –AQ T3xx Transformer Protection IED 114 (165 Figure 3-53 Voltage level settings Time delay in automatic control mode In automatic control mode the first and every subsequent control command is processed separately. For the first control command: The voltage difference is calculated: If this difference is above the “U Deadband”...
  • Page 115 Instruction manual –AQ T3xx Transformer Protection IED 115 (165 o Min Delay minimum time delay “2powerN” • The binary parameters “Fast Lower Enable” and/or “Fast Higher Enable” enable fast command generation if the voltage is above the parameter value “U High Limit” or below the “U Low Limit”.
  • Page 116 Instruction manual –AQ T3xx Transformer Protection IED 116 (165 enumerated parameter “CodeType”, the values of which can be: Binary, BCD or Gray. During switchover, for the transient time defined by the parameter “Position Filter”, the position is not evaluated. The parameters “Min Position” and “Max Position” define the upper and lower limits. In the upper position, no further increasing command is generated and the output “Max Pos Reached”...
  • Page 117 Instruction manual –AQ T3xx Transformer Protection IED 117 (165 3.3.6.9 Symbol of the function in AQtivate300 software Figure 3-54 Function block of the automatic tap-changer controller Table 3-48 Outputs of the ATCC function block Title Explanation AutoBlocked Automatic control blocked Manual Signaling the manual mode of operation Higher Command...
  • Page 118 Instruction manual –AQ T3xx Transformer Protection IED 118 (165 Table 3-49 Inputs of the ATCC function block Title Explanation Local Local state of the manual operation Remote Remote state of the manual operation Blocking of the function AutoBlk Blocking of the automatic function Manual Manual mode of operation ManHigher...
  • Page 119 Instruction manual –AQ T3xx Transformer Protection IED 119 (165 Boolean Default Boolean parameter description parameter name Fast Higher Enabling fast higher control command Enable Fast Lower Enabling fast lower control command Enable Integer parameter name Step Default Integer parameter description Min Position Code value of the minimum position Max position...

  • Page 120: Switch On To Fault Logic

    Instruction manual –AQ T3xx Transformer Protection IED 120 (165 Float parameter name Unit Digits Default Float parameter description U Correction 0.950 1.050 1.000 Factor for fine tuning the measured voltage U Set 80.0 115.0 100.0 Set-point for voltage regulation, related to the rated voltage (Valid at I=0) U Deadband Dead band for voltage regulation,...
  • Page 121 Instruction manual –AQ T3xx Transformer Protection IED 121 (165 voltage and the current. In case of close-in faults, however, the voltage of the faulty loop is near zero: it is not sufficient for a directional decision. If there are no healthy phases, then the voltage samples stored in the memory are applied to decide if the fault is forward or reverse.
  • Page 122 Instruction manual –AQ T3xx Transformer Protection IED 122 (165 The binary input signals of the “switch-onto-fault” detection function are: CBClose Manual close command to the circuit breaker, • DeadLine Dead line condition detected. This is usually the output signal of the DLD •...

  • Page 123: Disturbance Recorder

    This procedure assures that the three component files (.cfg, .dat and .inf) are stored in the same location. The evaluation can be performed using any COMTRADE evaluator software, e.g. Arcteq’s AQview software. Consult your nearest Arcteq representative for availability. The symbol of the function block in the AQtivate 300 software The function block of the disturbance recorder function is shown in figure bellow.

  • Page 124: Event Recorder

    Instruction manual –AQ T3xx Transformer Protection IED 124 (165 Figure 3-3: The function block of the disturbance recorder function The binary input and output status signals of the dead line detection function are listed in tables below. Table 3-54 The binary input signal of the disturbance recorder function Binary status signal Explanation Output status of a graphic equation defined by the user to start...
  • Page 125 Instruction manual –AQ T3xx Transformer Protection IED 125 (165 Health of device Health of device Three-phase instantaneous overcurrent protection function (IOC50) Trip L1 Trip command in phase L1 Trip L2 Trip command in phase L2 Trip L3 Trip command in phase L3 General Trip General trip command Residual instantaneous overcurrent protection function (IOC50N)
  • Page 126 Instruction manual –AQ T3xx Transformer Protection IED 126 (165 Low General Trip Low setting stage general trip command High Start L1 High setting stage start signal in phase L1 High Start L2 High setting stage start signal in phase L2 High Start L3 High setting stage start signal in phase L3 High General Start...
  • Page 127 Instruction manual –AQ T3xx Transformer Protection IED 127 (165 Close_Auto Close command in automatic mode of operation Released Man The function releases manual close command In progress Man The manual close command is in progress Close_ Man Close command in manual mode of operation Automatic reclosing function (REC79) Blocked Blocked state of the automatic reclosing function...

  • Page 128: Measured Values

    Instruction manual –AQ T3xx Transformer Protection IED 128 (165 Enable Open Open command is enabled Local Local mode of operation Operation counter Operation counter DC OPCap Disconnector Bus Status value Status of the bus disconnector Enable Close Close command is enabled Enable Open Open command is enabled Local...

  • Page 129: Status Monitoring The Switching Devices

    Instruction manual –AQ T3xx Transformer Protection IED 129 (165 Current Ch - I2 RMS value of the Fourier fundamental harmonic current component in phase Angle Ch - I2 Phase angle of the Fourier fundamental harmonic current component in phase Current Ch - I3 RMS value of the Fourier fundamental harmonic current component in phase Angle Ch - I3 Phase angle of the Fourier fundamental harmonic current component in phase...

  • Page 130: Trip Circuit Supervision

    Instruction manual –AQ T3xx Transformer Protection IED 130 (165 3.3.12 T RIP CIRCUIT SUPERVISION All four fast acting trip contacts contain build-in trip circuit supervision function. The output voltage of the circuit is 5V(+-1V). The pickup resistance is 2.5kohm(+-1kohm). Note: Pay attention to the polarity of the auxiliary voltage supply as outputs are polarity dependent.

  • Page 131: System Integration

    Instruction manual –AQ T3xx Transformer Protection IED 131 (165 YSTEM INTEGRATION The AQ T3xx contains two ports for communicating to upper level supervisory system and one for process bus communication. The physical media or the ports can be either serial fiber optic or RJ 45 or Ethernet fiber optic.

  • Page 132: Connections

    Instruction manual –AQ T3xx Transformer Protection IED 132 (165 ONNECTIONS AQ-T352 LOCK DIAGRAM MINIMUM OPTIONS Figure 5-1 Block diagram of AQ-T352 with minimum options installed.

  • Page 133: Block Diagram Aq-T352 All Options

    Instruction manual –AQ T3xx Transformer Protection IED 133 (165 AQ-T352 LOCK DIAGRAM ALL OPTIONS Figure 5-2 Block diagram of AQ-T352 with all options installed. If voltage measurement option is installed into the IED, voltage based protection functions are available. For the E and F slots can be installed either DI or DO options.

  • Page 134: Connection Example Of Aq-T352

    Instruction manual –AQ T3xx Transformer Protection IED 134 (165 AQ-T352 ONNECTION EXAMPLE OF Figure 5-3 Connection example of AQ-T352 transformer protection IED.

  • Page 135: Block Diagram Aq-T392 Minimum Options

    Instruction manual –AQ T3xx Transformer Protection IED 135 (165 AQ-T392 LOCK DIAGRAM MINIMUM OPTIONS...

  • Page 136: Block Diagram Aq-T392 All Options

    Instruction manual –AQ T3xx Transformer Protection IED 136 (165 AQ-T392 LOCK DIAGRAM ALL OPTIONS...

  • Page 137: Block Diagram Aq-T393 Minimum Options

    Instruction manual –AQ T3xx Transformer Protection IED 137 (165 AQ-T393 LOCK DIAGRAM MINIMUM OPTIONS Figure 5-4 Block diagram of AQ-T393 with minimum options installed...

  • Page 138: Block Diagram Aq-T393 All Options

    Instruction manual –AQ T3xx Transformer Protection IED 138 (165 AQ-T393 LOCK DIAGRAM ALL OPTIONS Figure 5-5 Block diagram of AQ-T393 with all options installed. IED has six spare slots available for option cards which are not used in this example.

  • Page 139: Connection Example Of Aq-T393

    Instruction manual –AQ T3xx Transformer Protection IED 139 (165 AQ-T393 ONNECTION EXAMPLE OF Figure 5-1 Connection example of AQ-T393 Transformer protection IED.

  • Page 140: Construction And Installation

    AQ-T352 ONSTRUCTION AND INSTALLATION OF The Arcteq AQ-T352 Transformer protection IED consists of hardware modules. Due to modular structure optional positions for the slots F, G, H and I can be user defined in the ordering of the IED to include I/O modules and other types of additional modules. An example module arrangement configuration of the AQ-T352 IED is shown in the figure below.

  • Page 141: Construction And Installation Of Aq-T392

    AQ-T392 ONSTRUCTION AND INSTALLATION OF The Arcteq AQ-T392 Transformer protection IED consists of hardware modules. Due to modular structure optional positions for the slots J, K, L, M, N, O, P, R, S and T can be user defined in the ordering of the IED to include I/O modules and other types of additional modules.

  • Page 142: Construction And Installation Of Aq-T393

    AQ-T393 ONSTRUCTION AND INSTALLATION OF The Arcteq AQ-T393 Transformer protection IED consists of hardware modules. Due to modular structure optional positions for the slots J, K, L, M, N, O, P, R, S and T can be user defined in the ordering of the IED to include I/O modules and other types of additional modules.

  • Page 143: Cpu Module

    Instruction manual –AQ T3xx Transformer Protection IED 143 (165 MODULE The CPU module contains all the protection, control and communication functions of the AQ 3xx device. Dual 500 MHz high- performance Analog Devices Blackfin processors separates relay functions (RDSP) from communication and HMI functions (CDSP). Reliable communication between processors is performed via high- speed synchronous serial internal bus (SPORT).

  • Page 144: Power Supply Module

    Instruction manual –AQ T3xx Transformer Protection IED 144 (165 OWER SUPPLY MODULE The power supply module converts primary AC and/or DC voltage to required system voltages. Redundant power supply cards extend system availability in case of the outage of any power source and can be ordered separately if required Figure 6-1 Connector allocation of the 30W power supply unit "A"...

  • Page 145: Binary Input Module

    Instruction manual –AQ T3xx Transformer Protection IED 145 (165 INARY INPUT MODULE The inputs are galvanic isolated and the module converts high-voltage signals to the voltage level and format of the internal circuits. This module is also used as an external IRIG-B synchronization input.

  • Page 146: Binary Output Modules For Signaling

    Instruction manual –AQ T3xx Transformer Protection IED 146 (165 INARY OUTPUT MODULES FOR SIGNALING The signaling output modules can be ordered as 8 relay outputs with dry contacts. "H" R8+/80 No. Name 1 BOut_H01 Common 2 BOut_H01 NO 3 BOut_H02 Common 4 BOut_H02 NO 5 BOut_H03 Common 6 BOut_H03 NO...

  • Page 147: Tripping Module

    Instruction manual –AQ T3xx Transformer Protection IED 147 (165 RIPPING MODULE The tripping module applies direct control of a circuit breaker. The module provides fast operation rated heavy duty controlling. "E" TRIP+/2101 No. Name 1 Trip1 + 2 Trip1 - 3 Trip1 NO 4 Trip 2 + 5 Trip 2 -...

  • Page 148: Voltage Measurement Module

    Instruction manual –AQ T3xx Transformer Protection IED 148 (165 OLTAGE MEASUREMENT MODULE For voltage related functions (over- /under -voltage, directional functions, distance function, power functions) or disturbance recorder functionality this module is needed. This module also has capability for frequency measurement. For capacitive voltage measurement of the synchrocheck reference, the voltage measurement module can be ordered with reduced burden in channel VT4.

  • Page 149: Current Measurement Module

    Instruction manual –AQ T3xx Transformer Protection IED 149 (165 6.10 C URRENT MEASUREMENT MODULE Current measurement module is used for measuring current transformer output current. Module includes three phase current inputs and one zero sequence current input. The nominal rated current of the input can be selected with a software parameter either 1 A or 5 A.

  • Page 150: Ma Input Module

    Instruction manual –AQ T3xx Transformer Protection IED 150 (165 6.11 INPUT MODULE The analog input module accepts transducers current outputs. The AIC module can measure unipolar and bipolar current values in wide ranges. "T" AIC+/0200 No. Name 1 NU 2 Tr. TC Pos. IN 3 Tr.

  • Page 151: Installation And Dimensions

    Instruction manual –AQ T3xx Transformer Protection IED 151 (165 6.12 I NSTALLATION AND DIMENSIONS Figure 6-2: Dimensions of AQ-35x IED.
  • Page 152 Instruction manual –AQ T3xx Transformer Protection IED 152 (165 Figure 6-3: Panel cut-out and spacing of AQ-35x IED.
  • Page 153 Instruction manual –AQ T3xx Transformer Protection IED 153 (165 Figure 6-4: Dimensions of AQ-39x IED.
  • Page 154 Instruction manual –AQ T3xx Transformer Protection IED 154 (165 Figure 6-5: Panel cut-out and spacing of AQ-39x IED.

  • Page 155: Technical Data

    Instruction manual –AQ T3xx Transformer Protection IED 155 (165 ECHNICAL DATA ROTECTION FUNCTIONS 7.1.1 D IFFERENTIAL PROTECTION FUNCTIONS Differential protection (87) Operating characteristic 2 breakpoint Characteristics inaccuracy <2% Reset ratio 0,95 Operate time, unrestrained Typically 20ms Reset time, unrestrained Typically 25ms Operate time, restrained Typically 30ms Reset time, restrained...
  • Page 156 Instruction manual –AQ T3xx Transformer Protection IED 156 (165 Residual instantaneous overcurrent protection I0>>> (50N) Operating characteristic Instantaneous Picku-up current inaccuracy <2% Reset ratio 0.95 Operate time at 2*In Peak value calculation <15 ms Fourier calculation <25 ms Reset time 16 –...

  • Page 157: Voltage Protection Functions

    Instruction manual –AQ T3xx Transformer Protection IED 157 (165 7.1.3 V OLTAGE PROTECTION FUNCTIONS Overvoltage protection function U>, U>> (59) Pick-up starting inaccuracy < 0,5 % Reset time U> → Un 50 ms U> → 0 40 ms Operation time inaccuracy + 15 ms Undervoltage protection function U<, U<<...

  • Page 158: Other Protection Functions

    Instruction manual –AQ T3xx Transformer Protection IED 158 (165 Underfrequency protection function f<, f<<, (81U) Operating range 40 - 60 Hz Operating range inaccuracy 30mHz Effective range inaccuracy 2mHz Minimum operating time 100ms Operation time inaccuracy + 10ms Reset ratio 0,99 Rate of change of frequency protection function df/dt>, df/dt>>...

  • Page 159: Control Functions

    Instruction manual –AQ T3xx Transformer Protection IED 159 (165 Inrush current detection function INR2, (68) Current inaccuracy <2 % Reset ratio 0,95 Operating time Approx. 20 ms Overexcitation/volts per hertz protection V/Hz, (24) Frequency range 10…70Hz Voltage range 10…170V secondary Voltage measurement inaccuracy <1% (0.5 –...

  • Page 160: Hardware

    Instruction manual –AQ T3xx Transformer Protection IED 160 (165 Automatic tap changer controller Function Range Accuracy Voltage measurement 50% < U < 130% <1% Definite time delay <2% or +/-20ms, whichever is greater Inverse and “2powerN” 12% < DU < 25% <5% time delay 25% <...

  • Page 161: Voltage Measurement Module

    Instruction manual –AQ T3xx Transformer Protection IED 161 (165 7.3.3 V OLTAGE MEASUREMENT MODULE Rated voltage Un 100/√3, 100V, 200/√3, 200V (parameter settable) Number of channels per module Rated frequency 50Hz 60Hz (ordering option) Burden <1VA at 200V Voltage withstand 250V (continuous) Voltage measurement range 0.05-1.2xUn...

  • Page 162: Tests And Environmental Conditions

    Instruction manual –AQ T3xx Transformer Protection IED 162 (165 ESTS AND ENVIRONMENTAL CONDITIONS 7.4.1 D ISTURBANCE TESTS CE approved and tested EMC test according to EN 50081-2, EN 50082-2 Emission 0.15 - 30MHz - Conducted (EN 55011 class A) 30 - 1 000MHz - Emitted (EN 55011 class A) Immunity - Static discharge (ESD) (According to IEC244-22-2...

  • Page 163: Environmental Conditions

    Instruction manual –AQ T3xx Transformer Protection IED 163 (165 7.4.5 E NVIRONMENTAL CONDITIONS Specified ambient service temp. range -10…+55°C Transport and storage temp. range -40…+70°C...

  • Page 164: Ordering Information

    Instruction manual –AQ T3xx Transformer Protection IED 164 (165 RDERING INFORMATION Visit https://configurator.arcteq.fi/ to build a hardware configuration, define an ordering code and get a module layout image.

  • Page 165: Reference Information

    Instruction manual –AQ T3xx Transformer Protection IED 165 (165 EFERENCE INFORMATION Manufacturer information: Arcteq Ltd. Finland Visiting and postal address: Wolffintie 36 F 11 65200 Vaasa, Finland Contacts: Phone, general and commercial issues (office hours GMT +2): +358 10 3221 370...

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