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Seg HighTECH MRG3 Manual

Generator protection with mains supervision, time overcurrent protection and earth current supervision
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MANUAL
HighTECH Line
MRG3
TIME OVERCURRENT PROTECTION AND EARTH CURRENT SUPERVISION
PROTECTION TECHNOLOGY
MADE SIMPLE
GENERATOR PROTECTION WITH MAINS
SUPERVISION, TIME OVERCURRENT PROTECTION
AND EARTH CURRENT SUPERVISION
GENERATOR PROTECTION WITH MAINS SUPERVISION,
Original document
English
Revision: D

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Summary of Contents for Seg HighTECH MRG3

  • Page 1 MANUAL HighTECH Line PROTECTION TECHNOLOGY MADE SIMPLE MRG3 GENERATOR PROTECTION WITH MAINS SUPERVISION, TIME OVERCURRENT PROTECTION AND EARTH CURRENT SUPERVISION GENERATOR PROTECTION WITH MAINS SUPERVISION, TIME OVERCURRENT PROTECTION AND EARTH CURRENT SUPERVISION Original document English Revision: D...
  • Page 2 SEG Electronics GmbH Manual MRG3 SEG Electronics reserves the right to update any portion of this publication at any time. Information provided by SEG Electronics is believed to be correct and reliable. However, no responsibility is assumed by SEG Electronics unless otherwise expressly undertaken.

  • Page 3: Table Of Contents

    Manual MRG3 SEG Electronics GmbH Inhalt Overview and Application ................6 Features and Characteristics ..............7 Design ......................8 Connections ........................8 3.1.1 Connection Diagrams ...................... 8 3.1.2 Analog input circuits ...................... 13 3.1.3 Output relays ......................... 13 3.1.4 Blocking input ........................ 13 3.1.5...
  • Page 4 SEG Electronics GmbH Manual MRG3 5.5.2 Time current characteristics for phase over current element ........46 5.5.3 Trip delay or time factor for phase over current element ..........46 5.5.4 Reset mode for all tripping characteristics in the phase current path......47 5.5.5...
  • Page 5 Manual MRG3 SEG Electronics GmbH Checking the external blocking and reset inputs .............. 70 6.7.1 Test of the CB failure protection ..................70 Primary injection test ......................70 Maintenance ........................70 Technical data .................... 71 Measuring input voltage ....................71 7.1.1...

  • Page 6: Overview And Application

    (ER/XR-relay type),  two-step protection for the residual voltage For applications where only individual protection functions are required SEG Electronics GmbH can, of course, also offer the following MR-relays as individual devices: ...

  • Page 7: Features And Characteristics

    Manual MRG3 SEG Electronics GmbH 2. Features and Characteristics  Microprocessor technology with watchdog function.  Effective analog low pass filter for suppressing harmonics when measuring frequency, df/dt and vector surge.  Digital filtering of the measured values by using discrete Fourier analysis to suppress higher harmonics and d.c.

  • Page 8: Design

    SEG Electronics GmbH Manual MRG3 3. Design Connections 3.1.1 Connection Diagrams Figure 3.1: Connection diagram “Mains decoupling” The measuring circuits can optionally be star- or delta connected (see chapter 4.3.1) Figure 3.2: MRG3-I Connection diagram “Mains decoupling with time over current protection...
  • Page 9 Manual MRG3 SEG Electronics GmbH Figure 3.3: MRG3-I Connection diagram “Mains decoupling with time over current protection” Figure 3.4: Connection diagram with time over current protection and earth fault protection Holmgreen circuit This connection can be used with three existing phase current transformers when combined phase and earth-current measuring is required.
  • Page 10 SEG Electronics GmbH Manual MRG3 Figure 3.5: Connection diagram with time over current protection and earth fault directional feature DOK-TD-MRG3, Rev. D...
  • Page 11 Manual MRG3 SEG Electronics GmbH Figure 3.6: Connection diagram with time over current protection and detection of the residual voltage For the unit version including the earth fault directional feature (ER unit type), the residual voltage U can be generated internally in the secondary measuring circuit. The device shall then be encod- ed as described in chapter 3.1.8.
  • Page 12 SEG Electronics GmbH Manual MRG3 Figure 3.7: Connection diagram with detection of the residual voltage DOK-TD-MRG3, Rev. D...

  • Page 13: Analog Input Circuits

    Manual MRG3 SEG Electronics GmbH 3.1.2 Analog input circuits The protection unit receives the analog input signals of the phase currents IL1 (B3-B4), IL2 (B5- B6), IL3 B7-B8) and the current IE (B1-B2), phase voltages U (A3 - A4), U (A5 - A6);...

  • Page 14: Code Plugs

    SEG Electronics GmbH Manual MRG3 3.1.8 Code plugs The measuring range of phase and residual voltage can be adjusted via code plugs. For the meas- uring range from 0 – 150 V, the code plugs have to be adjusted to X-100V; for the measuring range 0 –...
  • Page 15 Manual MRG3 SEG Electronics GmbH Figure 3.9: Change over to/of measuring range for phase voltages phase l1 and L2 Figure 3.10: Change-over to/of measuring range for phase voltage Phase L3. Selection of the measuring method to be used for residual voltage.

  • Page 16: Low/High Range Of The Digital Inputs

    SEG Electronics GmbH Manual MRG3 There are three possibilities to measure the residual voltage:  directly in the star point  based on the open delta winding  based on star-connected phase voltages For detailed description of this function, refer to chapter 4.7.3.

  • Page 17: Front Plates

    Manual MRG3 SEG Electronics GmbH Front plates Figure 3.12: Front plate MRG3 Figure 3.13: Front plate MRG3-IE DOK-TD-MRG3, Rev. D...
  • Page 18 SEG Electronics GmbH Manual MRG3 Figure 3.14: Front plate MRG3-IU0 Figure 3.15: Front plate MRG3-I DOK-TD-MRG3, Rev. D...
  • Page 19 Manual MRG3 SEG Electronics GmbH Figure 3.16: Front plate MRG3-IER Figure 3.17: Front plate MRG3-UO DOK-TD-MRG3, Rev. D...

  • Page 20: Leds

    SEG Electronics GmbH Manual MRG3 LEDs All LEDs (except L1, L2, L3 and the clock symbol) are two colored. The LEDs on the left side, next to the alphanumerical display light up green during measuring and red after fault messages.

  • Page 21: Working Principle

    Manual MRG3 SEG Electronics GmbH 4. Working Principle Analog circuits The input voltages are galvanically insulated by the input transformers. Thereafter, the influence of noise signals caused by inductive and capacitive coupling is suppressed by an analog R-C filter circuit.

  • Page 22: Selection Of Star Or Delta Connection

    SEG Electronics GmbH Manual MRG3 4.3.1 Selection of star or delta connection All connections of the input voltage transformers are led to screw terminals. The nominal voltage of the device is relates to the nominal voltage of the input transformers. Dependent on the application the input transformers can be connected in either delta or star.

  • Page 23: Principle Of Frequency Supervision

    Manual MRG3 SEG Electronics GmbH Principle of frequency supervision The MRG3 is used to generally protect electrical generators, consumers or electrical operating equipment in general against over- or under frequency. For this purpose, the relay provides three frequency elements f with a free choice of parameters, with pickup values and delay times that can be independently adjusted.

  • Page 24: Mains Decoupling

    SEG Electronics GmbH Manual MRG3 Mains decoupling The MRG3 provides two different evaluation criteria for the mains decoupling: measurement of the frequency gradient and supervision of vector surge. By means of parameter setting, it is possible to select one of the two measurement methods.

  • Page 25: Vector Surge Supervision

    Manual MRG3 SEG Electronics GmbH 4.5.2 Vector surge supervision The vector surge supervision protects synchronous generators in mains parallel operation due to very fast decoupling in case of mains failure. Very dangerous are mains auto reclosing for synchronous generators. The mains voltage returning after 300 ms can hit the generator in asyn- chronous position.

  • Page 26: Measuring Principle Of Vector Surge Supervision

    SEG Electronics GmbH Manual MRG3 4.5.3 Measuring principle of vector surge supervision When a synchronous generator generates power, the so-called rotor displacement angle is built between the terminal voltage (mains voltage U1) and the synchronous internal voltage (Up). This rotor angle produces a voltage difference U is built between Up and U1 (Fig. 4.4).
  • Page 27 Manual MRG3 SEG Electronics GmbH Figure 4.6: Equivalent circuit for mains failure In case of mains failure or auto reclosing the generator suddenly feeds a very high consumer load. The rotor displacement angle is suddenly increases and the voltage vector U1 changes its direction (U1') (Fig.
  • Page 28 SEG Electronics GmbH Manual MRG3 Figure 4.8: Voltage Vector surge As shown in the voltage/time diagram the instantaneous value of the voltage jumps to another value and the phase position changes. This instance is generally called phase or vector surge.

  • Page 29: Voltage Threshold Value For Frequency, Df/Dt And Vector Surge Measuring

    Manual MRG3 SEG Electronics GmbH In case of an undetected mains failure, i.e. with the mains coupling C.B. closed, the vector surge relay re-acts upon the first load change causing a vector surge and disconnects the mains C.B. Another possibility to detect high resistance mains failures is to apply a zero current relay with an adjustable trip delay can be used.

  • Page 30: Earth Fault Protection

    SEG Electronics GmbH Manual MRG3 Earth fault protection 4.7.1 Generator stator earth fault protection With the generator neutral point earthed as shown in Figure 4.9, the MRG3 picks up only to phase earth faults between the generator and the location of the current transformers supplying the relay.

  • Page 31: Earth-Fault Directional Feature

    Manual MRG3 SEG Electronics GmbH 4.7.3 Earth-fault directional feature A built-in earth-fault directional element is available for applications to power networks with isolated or with arc suppressing coil compensated neutral point. For earth-fault direction detection it is mainly the question to evaluate the power flow direction in zero sequence system.
  • Page 32 SEG Electronics GmbH Manual MRG3 Figure 4.11: Phase position between the residual voltage and zero sequence current for faulted and non-faulted  lines in case of isolated systems (sin -residual voltage -zero sequence current -capacitive component of zero sequence current -resistive component of zero sequence current By calculating the reactive current component (sin ...

  • Page 33: Residual Voltage

    Manual MRG3 SEG Electronics GmbH In compensated mains the earth fault direction cannot be determined from the reactive current components because the reactive part of the earth current depends upon the compensation level of the mains. The ohmic component of the total current (calculated by cos  adjustment) is used in order to determine the direction.

  • Page 34: Fault Recorder

    SEG Electronics GmbH Manual MRG3 Fault recorder The MRG3 has a fault value recorder which records the measured analog values as instantaneous values. The instantaneous values for star connection for delta connection are scanned at a raster of 1.25 ms (at 50 Hz) and 1.041 ms (at 60 Hz) and saved in a cyclic buffer.
  • Page 35 Manual MRG3 SEG Electronics GmbH Figure 4.14: Basic set-up of the fault recorder Each memory segment has a specified storage time which permits setting of a time prior to the trigger event. Via the interface RS485 the data can be read and processed by means of a PC (HTL/PL-Soft4).

  • Page 36: Operation And Settings

    SEG Electronics GmbH Manual MRG3 5. Operation and Settings Display The table below shows the different special symbols used. Detailed information on the functions can be taken from the appropriate chapters, not all the functions, however, are described in all de- vices.
  • Page 37 Manual MRG3 SEG Electronics GmbH Function Display shows Pressed pushbuttons Correspond- Chap- required ing LED voltage for residual SEK.. setting value in kV U+E+3 5.10.4 voltage Primary rated genera- tor residual voltage Method used to meas- 3PHA, E:N, 1:1 <SELECT/RESET><+><->...
  • Page 38 SEG Electronics GmbH Manual MRG3 Function Display shows Pressed pushbuttons Correspond- Chap- required ing LED time factor for the without unit characteristics Reset- Mode 0s/60s <SELECT/RESET><+> <-> I + 1 + > + t> 5.5.4 Short circuit I>> Setting value in % <SELECT/RESET><+><->...
  • Page 39 Manual MRG3 SEG Electronics GmbH Function Display shows Pressed pushbuttons Correspond- Chap- required ing LED relay assignment _ _ _ _ . .1_3_ <SELECT/RESET><+><-> L1; L2; L3; U; f; 5.7.1 /df; I; I 2 3 4 one time for each value ;...

  • Page 40: Setting Procedure

    SEG Electronics GmbH Manual MRG3 Setting procedure In this paragraph the settings for all relay parameters are described in detail. For parameter setting a password has to be entered first (please refer to 4.4 of description "MR-Digital Multifunctional Re- lays").

  • Page 41: Voltage Transformer Connection For Residual Voltage Measuring (3Pha/E-N/1:1)

    Manual MRG3 SEG Electronics GmbH The generator has a rated voltage of 180 A. Voltage transformers with a rating of 200 A/5A shall be applied. Resulting from this, the parameter settings are as follows: rated primary CT current: 0.20 kA rated generator current: 0.18 kA...

  • Page 42: Parameter Changeover Switch/External Triggering Of The Fault Recorder

    SEG Electronics GmbH Manual MRG3 5.3.9 Parameter changeover switch/external triggering of the fault recorder By means of the parameter-change-over switches it is possible to activate two different parameter sets. Switching over of the parameter sets can either be done by means of software or via the ex- ternal inputs RESET or blocking input.

  • Page 43: Protection Parameter "Mains Decoupling

    Manual MRG3 SEG Electronics GmbH Protection parameter “Mains decoupling” 5.4.1 Parameter setting of “Over- and under voltage functions” The setting procedure is guided by two colored LEDs. During setting of the voltage thresholds the LEDs U<, U<<, U> and U>> will be flashing up as follows: U<...

  • Page 44: Threshold Values Of Frequency Supervision

    SEG Electronics GmbH Manual MRG3 5.4.3 Threshold values of frequency supervision The frequency supervision of MRG3 has three frequency elements that are independent from each other. Dependening on whether the pick-up value was set above or below the nominal frequency, these elements can be used for over- or for under frequency supervision.
  • Page 45 Manual MRG3 SEG Electronics GmbH The recommended setting of the vector surge angle  in an efficient mains is 4 - 6 degrees. This setting is sufficient in most cases, because low impedance mains never have a vector surge great- er than this value.

  • Page 46: Settable Threshold

    SEG Electronics GmbH Manual MRG3 5.4.6 Settable threshold Correct frequency measuring or vector surge measuring cannot be obtained if the system voltage is very low, for instance during generator start up or voltage failure. False tripping of the MRG3 in such cases is prevented by an adjustable voltage threshold U .

  • Page 47: Reset Mode For All Tripping Characteristics In The Phase Current Path

    Manual MRG3 SEG Electronics GmbH 5.5.4 Reset mode for all tripping characteristics in the phase current path To ensure tripping, even with recurring fault pulses shorter than the set trip delay, the reset mode for in-verse time tripping characteristics can be switched over. If the adjustment I + 1 + > = 60s, the tripping time is only reset after 60 s of faultless condition.

  • Page 48: Parameter Protection Earth Fault Supervision

    SEG Electronics GmbH Manual MRG3 Parameter protection earth fault supervision 5.6.1 Pick-up value for residual voltage Regardless of the preset earth current, an earth fault is only identified if the residual voltage ex- ceeds the set reference value. This value is indicated in % of the generator rated voltage.

  • Page 49: Trip Delay Or Time Multiplier For Earth Fault Element

    Manual MRG3 SEG Electronics GmbH 5.6.6 Trip delay or time multiplier for earth fault element (Similar to chapter 5.5.3). Flashing of the LEDs IE + 1 + > + t> upon this setting. Relay version MRG3-IER: This version including directional feature allows different adjustment of the tripping time for forward and backward faults.

  • Page 50: More Settings

    SEG Electronics GmbH Manual MRG3 More Settings 5.7.1 Circuit breaker failure protection The CB failure protection is based on supervision of phase currents during tripping events. Only af- ter tripping this protective function becomes active. The test criterion is whether all phase currents are dropped to <...

  • Page 51: Fault Recorder

    Manual MRG3 SEG Electronics GmbH Fault recorder 5.8.1 Adjustment of the fault recorder The MRG3 is equipped with a fault recorder (see chapter 4.8. Three parameters can be adjusted. 5.8.2 Number of the fault recordings The max. recording time is 20 s at 50 Hz or 16,66 s at 60 Hz.

  • Page 52: Adjustment Of The Clock

    SEG Electronics GmbH Manual MRG3 5.8.5 Adjustment of the clock When adjusting the date and time, LED  lights up. The adjustment method is as follows: Date : year y=00 month m=00 d=00 Time : hour h=00 minute m=00 second s=00 The clock starts with the set date and time as soon as the supply voltage is switched on.

  • Page 53: Additional Functions

    Manual MRG3 SEG Electronics GmbH Additional functions 5.9.1 Blocking of protection functions and assignment of the output relays The blocking function of the MRG3 can be set according to requirement. By applying the aux. volt- age to D8/E8, the functions chosen by the user are blocked. Setting of the parameter should be done as follows: ...
  • Page 54 SEG Electronics GmbH Manual MRG3 Note: The function of jumper J2 that is described in the general description "MR Digital Multifunctional Relays" does not apply to the MRG3. For relays without assignment mode this jumper is used for parameter setting of alarm relays (activation at pickup or tripping).

  • Page 55: Indication Of Measuring Values

    Manual MRG3 SEG Electronics GmbH 5.10 Indication of measuring values 5.10.1 Measuring indication for mains decoupling In normal operation the following measuring values for mains decoupling can be displayed: In star connection:  Voltage in phase L1 LED: U + L1 ...

  • Page 56: Unit Of The Measuring Values Displayed

    SEG Electronics GmbH Manual MRG3 As to operation: After each reset (refer to 5.10.9) the min./max. storages are cleared. As from this instant there is no time limit for the min./max. storage until the next reset By repeatedly pressing the <SELECT/RESET>...

  • Page 57: Units Of The Measuring Values

    Manual MRG3 SEG Electronics GmbH 5.10.5 Units of the measuring values The measuring values can optionally be shown in the display as a multiple of the "sek" rated value or as primary current. According to this the units of the display change as follows:...

  • Page 58: Indication Of Fault Data

    SEG Electronics GmbH Manual MRG3 5.10.6 Indication of fault data All faults occurrences detected by the relay are indicated on the front plate optically. For this pur- pose, the MRG3 is equipped with the three LEDs (L1, L2, L3) and the function LEDs U, f, I, IE, U0, 1, 2, 3, <, >, t>...

  • Page 59: Erasure Of Fault Storage

    Manual MRG3 SEG Electronics GmbH Recorded fault data: Measuring Displayed value Corresponding LED Voltage U_L1 U + L1 U_L2 U + L2 U_L3 in star connection U + L3 U_L1/L2 U_L2/L3 U + L1 + L2 U_L3/L1 in delta connection...

  • Page 60: Reset

    SEG Electronics GmbH Manual MRG3 5.10.9 Reset All relays have the following four possibilities to reset the display of the unit and the output relay at jumper position J3=ON. (see also the description MR – Digital Multifunctional relay in chapter: 4.2.1...

  • Page 61: Maintenance And Commissioning

    Manual MRG3 SEG Electronics GmbH 6. Maintenance and Commissioning The test instructions following below help to verify the protection relay performance before or dur- ing commissioning of the protection system. To avoid a relay damage and to ensure a correct relay operation, make sure that: ...

  • Page 62: Checking The Set Values

    SEG Electronics GmbH Manual MRG3 Checking the set values By repeatedly pressing the push button <SELECT>, all relay set values may be checked. Set value modification can be done with the push button <+><-> and <ENTER>. (For detailed information about that, please refer to chapter 4.5 of the description “MR – Digital multifunctional relays”.

  • Page 63: Test Circuit

    Manual MRG3 SEG Electronics GmbH 6.4.2 Test circuit For testing the voltage functions of the MRG3-relay a three phase voltage source with adjustable voltage and frequency is required. Figure 6.1 shows an example of a three-phase test circuit ener- gising the MRG3 relay during test. The three phase voltages are connected to the relay in Y- connection.

  • Page 64: Checking Of The Input Circuits And Measuring Functions

    SEG Electronics GmbH Manual MRG3 6.4.3 Checking of the input circuits and measuring functions Apply three voltages of rated value to the voltage input circuits (terminals A3 - A8) of the relay. Check the measured voltages, frequency and vector surge on the display by pressing the push but- ton <SELECT/RESET>...

  • Page 65: Checking Of The Pick-Up And Release Values For Over/Under Frequency

    Manual MRG3 SEG Electronics GmbH 6.4.6 Checking of the pick-up and release values for over/under frequency Note! Due to frequency changes, vector surge tripping or df/dt - tripping can occur during frequency tests. In order to ensure a trouble-free test procedure, the vector surge function or df/dt function of the re- lay have to be blocked before tests are started.

  • Page 66: Test With Transformer Secondary Current (Secondary Injection Test)

    SEG Electronics GmbH Manual MRG3 Figure 6.2: Test circuit for the vector surge function Test with transformer secondary current (Secondary injection test) 6.5.1 Equipment required to test voltage functions  Amperemeter and voltmeter, class 1 or higher,  auxiliary voltage source supply with the voltage corresponding to the rated data pn the type plate, ...

  • Page 67: Test Circuit For The Current Function

    Manual MRG3 SEG Electronics GmbH 6.5.2 Test circuit for the current function Only an adequate power source is required to test the MRG3-I. The below figure shows a simple example of a single-phase test circuit with controllable power source. Figure 6.3: Test circuit for phase current test 6.5.3 Checking the input circuits and measured values...

  • Page 68: Checking The Operating And Resetting Values Of The Relay

    SEG Electronics GmbH Manual MRG3 6.5.4 Checking the operating and resetting values of the relay Impress a current which is less than the relay set values in phase 1 of the relay and gradually in- crease the cur-rent until the relay starts, i.e. at the moment when the LED I> and L1 light up or the alarm output relay I>...

  • Page 69: Example Of A Test Circuit For Mrg3-Ier-Relay With Earth Current Directional Feature

    Manual MRG3 SEG Electronics GmbH Example of a test circuit for MRG3-IER-relay with earth current directional feature Figure 6.4: Test circuit for the testing of the earth directional element For testing relay MRG3-IER with earth current directional feature, current and voltage source sup- plies with adjustable phase shifting are required.

  • Page 70: Checking The External Blocking And Reset Inputs

    SEG Electronics GmbH Manual MRG3 Checking the external blocking and reset inputs By means of the external blocking input, it is possible to block all protective functions. To give an example, the blocking function of the phase current high set element is described.

  • Page 71: Technical Data

    Manual MRG3 SEG Electronics GmbH 7. Technical data Measuring input voltage Rated data: Nominal voltage 100 V or 400 V see chapter 3.1.8 Code plugs Nominal frequency 50/60 Hz 0 – 1.5 x U Measuring range: Measuring accuracy: % from measuring value or 0.5% from rated value Power consumption in: <...

  • Page 72: Measuring Input: Phase Current

    SEG Electronics GmbH Manual MRG3 Measuring input: phase current Rated data: Nominal current I 1A or 5A Nominal frequency f 50/60 Hz adjustable 0 – 40 x I Measuring range: Measuring accuracy: ±3% from measuring value or ±20mA Power consumption in:...

  • Page 73: Measuring Input: Earth Current

    Manual MRG3 SEG Electronics GmbH Measuring input: Earth current Rated data: Nominal current I 1A or 5A Nominal frequency f 50/60 Hz adjustable 0 – 4.0 x I Measuring range: MRG3-IE: 0 – 0.5 x I MRG3-IER: Measuring accuracy: ±3% from measuring value or ±20mA...

  • Page 74: Common Data

    SEG Electronics GmbH Manual MRG3 Common data Fault recorder Recorded traces: ,Ue, frequency, 3*vector surge or 1*df/dt Sample time: 1.25 ms at 50 Hz 1.041 ms at 60 Hz Storage capacity: 10 s (at 50 Hz) resp. 8.33 s (at 60 Hz) Number occurrences: 1 occurrence from 5s (4.16s)

  • Page 75: Setting Ranges And Steps

    Manual MRG3 SEG Electronics GmbH Setting ranges and steps 7.8.1 System parameter Setting range Step (range) Tolerance Interlinking of the voltage transformers Y= star connection D= delta connection (0.05…0.20) 0.001 U_L1 L2 L3_prim (sek) 0.05...500kV (0.20…0.50) 0.002 Primary nominal trans- (0.50…1.00)
  • Page 76 SEG Electronics GmbH Manual MRG3 Setting range Step (range) Tolerance Measured range 0 – 150V U0_sek 100V.. 600V 1 (100...150) Measured range 150 – 600 V Secondary nominal (150... 600) Change-over via coding plugs transformer voltage (see chapter 3.1.8) for residual voltage (sek.) 0.05…500kV...

  • Page 77: Parameter Protection: Voltage, Frequency, Df/Dt Protection

    Manual MRG3 SEG Electronics GmbH 7.8.2 Parameter protection: Voltage, Frequency, df/dt protection Setting range Step (range) Tolerance 1% of the set value or 0.5 % (1…150) U< 1...150 % (EXIT) U<< from U 1% or 25ms 0.02 (0.04...1.0) tU< 0.04...300 s (EXIT) 0.05...
  • Page 78 SEG Electronics GmbH Manual MRG3 Important Information on the Vector Surge Supervision: Single Phase Vector Supervision "1-of-3" ("1Ph" on the Display) Within the Area „Safe Area“ the trip decision depends on the set Angle „Delta phi“ only (please re- fer to figure Single Phase Vector Surge Supervision).

  • Page 79: Time Over Current Protection

    Manual MRG3 SEG Electronics GmbH 7.8.3 Time over current protection Setting range Step (range) Tolerance 3% of the set value or I> 20...400 % (EXIT) (20...50) 20mA (50...100) (100...200) (200...400) I_Char Definite Time DEFT 3% or 20 ms tI> 0.04 - 260 s (EXIT) 0.02...

  • Page 80: Earth Fault Supervision

    SEG Electronics GmbH Manual MRG3 7.8.4 Earth fault supervision Setting range Step (Range) Tolerance > Warn or trip of I > element trip; warn 3% of the set value > 1...200 % (EXIT) (1...5) or. 0.3% I (5...10) (10...20) (20...50) (50...100)

  • Page 81: Earth Fault Supervision With Directional Feature

    Manual MRG3 SEG Electronics GmbH 7.8.5 Earth fault supervision with directional feature Setting range Step (range) Tolerance 2% of the set value or 1 % 3pha: 1 – 86% U0> (1...150) e-n: 1 - 86 % from U 1:1: 1 - 150 % 3% of the set value...

  • Page 82: Residual Voltage Protection

    SEG Electronics GmbH Manual MRG3 7.8.7 Residual voltage protection Setting range Step Tolerance 2% of the set value or 1 % > e-n: 1 - 86% (1...150) 1:1: 1 - 150 % from U > Warning or tripping of the trip;...

  • Page 83: Parameter For The Fault Recorder

    Manual MRG3 SEG Electronics GmbH 7.8.10 Parameter for the fault recorder Function Parameter Number of recordings Rated frequency 1*/2 3*/4 7*/8 Applicable for MRG3; MRG3-U0 20.00 s 10.00 s 5.00 s 2.50 s 50 Hz 16.66 s 8.33 s 4.16 s 2.08 s 60 Hz 0.1 s –...

  • Page 84: Inverse Time Over Current Protection Relay

    SEG Electronics GmbH Manual MRG3 7.8.12 Inverse time over current protection relay According to IEC 255-4 or BS 142 Normal Inverse (Type A) 0.14 > [ �� ] �� = ∙ �� �� 0.02 �� − 1 �� �� Very Inverse (Type B) 13.5...

  • Page 85: Inverse Time Characteristics

    Manual MRG3 SEG Electronics GmbH Inverse time characteristics 1000 I> 10.0 t[s] 0.05 5 6 7 8 910 Figure 7.1: Normal Inverse (Typ A) 1000 I> t[s] 10.0 0.05 5 6 7 8 910 Figure 7.2: Very Inverse (Typ B)
  • Page 86 SEG Electronics GmbH Manual MRG3 1000 t[s] I> 10.0 0.05 0.05 0.01 5 6 7 8 910 Figure 7.3: Extremely Inverse (Typ C) I> 10.0 t[s] 0.05 5 6 7 8 910 Figure 7.4: RI-Inverse DOK-TD-MRG3, Rev. D...
  • Page 87 Manual MRG3 SEG Electronics GmbH 10000 1000 I> t[s] 10.0 0.05 5 6 7 8 910 Figure 7.5: Long Time Inverse I> t[s] 0.01 4 5 6 7 8 910 30 40 506070 Figure 7.6: RXIDG-characteristic DOK-TD-MRG3, Rev. D...

  • Page 88: Order Form

    SEG Electronics GmbH Manual MRG3 8. Order form Generator protection relay with voltage, fre- MRG3- quency, vector surge- and df/dt-supervision Time overcurrent protection Phase current 1 A rated current 5 A rated current Earth fault protection Earth current 1 A rated current...
  • Page 89 Manual MRG3 SEG Electronics GmbH Setting list MRG3 Note ! All settings must be checked at site and should the occasion arise, adjusted to the object/item to be protected. Project: Job.-no.: Function group: = Location: + Relay code: - Relay functions:...
  • Page 90 SEG Electronics GmbH Manual MRG3 System parameter Relay type Default Actual settings set- tings Symbol Function Unit /Y U+L1+L2+L3 Input voltage correction dependent X X X X X X on the connection of the input transformer U_L1 L2 U+L1+L2+L3 Primary nominal transformer...
  • Page 91 Manual MRG3 SEG Electronics GmbH Protection parameters: Mains decoupling Relay type Default Actual settings settings Symbol Function Unit Set 1 Set1 Set 2 Set 2 U< U+1+< Pickup value for the X X X X X X 90 under voltage element (low set) <...
  • Page 92 SEG Electronics GmbH Manual MRG3 Protection parameters: Phase and earth fault protection Relay type Default set- Actual tings settings Symbol Function Unit Set 1 Set1 Set 2 Set 2 I> I+1+> Pickup value for phase X X X 20 over current element I>...
  • Page 93 Manual MRG3 SEG Electronics GmbH Parameter for the fault recorder Relay type Default Actual settings settings Symbol/ Function Unit Number of recordings X X X X X X 4 Saving of the recording at the X X X X X X TRIP...
  • Page 94 SEG Electronics GmbH Manual MRG3 Assignment of the output relays Device type Default settings Actual settings Symbol U< Alarm U+1+< U< Ausl. U+1+<+t> U<< Alarm U+2+< U<< Ausl. U+2+<+t> U> Alarm U+1+> U> Ausl. U+1+>+t> U>> Alarm U+2+> U>> Ausl.
  • Page 95 Manual MRG3 SEG Electronics GmbH Setting of code jumpers Front plate Code jumper Default Actual Default Actual Default Actual settings settings settings settings settings settings Plugged Not plugged No function Digital inputs Code jumper Low/High-range for the DI_1 in- Low/High-range for the DI_2 input...
  • Page 96 SEG Electronics GmbH Manual MRG3 This technical manual is valid for Software-Version: MRG3 D01-1.00 mit ProOpenData-Protokoll MRG3- I D02-1.00 MRG3-U0 D03-1.00 MRG3-IE D04-1.00 MRG3-IU0 D05-1.00 MRG3-IER D06-1.00 MRG3-M D51-1.00 mit Modbus Protokoll MRG3-I-M D52-1.00 MRG3-U0-M D53-1.00 MRG3-IE-M D54-1.00 MRG3-IU0-M D55-1.00 MRG3-IER-M D56-1.00...
  • Page 97 SEG Electronics GmbH reserves the right to update any portion of this publication at any time. Information provided by SEG Electronics GmbH is believed to be correct and reliable. However, SEG Electronics GmbH assumes no responsibility unless otherwise expressly undertaken.

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