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MANUAL
HighTECH Line
MRI1
DIGITAL MULTIFUNCTIONAL RELAY FOR TIME-OVERCURRENT PROTECTION
PROTECTION TECHNOLOGY
MADE SIMPLE
DIGITAL MULTIFUNCTIONAL RELAY FOR
TIME-OVERCURRENT PROTECTION
Original document
English
Revision: A

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Summary of Contents for Seg HighTECH Line

  • Page 1 MANUAL HighTECH Line PROTECTION TECHNOLOGY MADE SIMPLE MRI1 DIGITAL MULTIFUNCTIONAL RELAY FOR TIME-OVERCURRENT PROTECTION DIGITAL MULTIFUNCTIONAL RELAY FOR TIME-OVERCURRENT PROTECTION Original document English Revision: A...
  • Page 2 5.2.15 Current setting for high set element of earth 1 Introduction and application fault supervision (I E>> 2 Features and characteristics 5.2.16 Trip delay for high set element of earth fault supervision (t 3 Design IE>> Connections 5.2.17 COS/SIN Measurement (ER/XR-relay type) 3.1.1 Analog input circuits 5.2.18 SOLI/RESI changeover (SR-relay type)
  • Page 3 7 Technical data Measuring input circuits Common data Setting ranges and steps 7.3.1 Time overcurrent protection (I-Type) 7.3.2 Earth fault protection (SR-Type) 7.3.3 Earth fault protection (E/X-Type) 7.3.4 Earth fault protection (ER/XR-Type) 7.3.5 Switch failure protection 7.3.6 Interface parameter 7.3.7 Inverse time overcurrent protection relay 7.3.8 Direction unit for phase overcurrent relay...
  • Page 4 ) of eight failure events CBFP • Free assignment of output relays • Serial data exchange via RS485 interface possible; alternatively with SEG RS485 Pro-Open Data Proto- col or Modbus Protocol • Suppression of indication after an activation (LED flash)
  • Page 5 Design Connections Phase and earth current measuring: Figure 3.3: Phase current measuring and earth-current Figure 3.1: Measuring of the phase currents for over-current- detection by means of Holmgreen-circuit. and short-circuit protection (I>,I>>) This connection can be used with three existing phase current transformers when combined phase and earth- current measuring is required.
  • Page 6 Voltage measuring for the directional detection: 3.1.1 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 U1 (A3), U2 (A5), U3 (A7) with A2 as star point, each via separate input transformers.
  • Page 7 Relay output contacts Contacts at MRI1: To prevent that the C.B. trip coil circuit is interrupted by the MRI1 first, i.e. before interruption by the C.B. auxiliary contact, a dwell time is fixed. This setting ensures that the MRI1 remains in self hold- ing for 200ms after the fault current is interrupted.
  • Page 8 3.2.1 Parameter settings (see chapter 5) Relay-type MRI1- IRER IRSR IRXR I> CHAR I> I> 0s / 60s I>> I>> 1:1 / 3 pha / e-n E> warn/trip CHAR I 0s/60 s E>> IE>> sin/cos soli/resi tCBFP 50/60 Hz LED-Flash RS485/Slaveaddress Baud-Rate Parity-Check...
  • Page 9 L1 L2 L3 L1 L2 L3 DISPLAY DISPLAY SELECT/RESET SELECT/RESET ENTER ENTER I> I> CHAR I> CHAR I> TRIP TRIP I> I> I>> I>> I>> I>> PHASE PHASE MRI1-I MRI1-IR Figure 3.7: Front panel MRI1-I Figure 3.9 Front panel MRI1-IR DISPLAY DISPLAY SELECT/RESET...
  • Page 10 LEDs The LEDs left from the display are partially bi-colored, the green indicating measuring, and the red fault indi- cation. MRI1 with directional addition have a LED (green- and red arrow) for the directional display. At pickup/trip DISPLAY and parameter setting the green LED lights up to indi- cate the forward direction, the red LED indicates the reverse direction.
  • Page 11 Working principle Analog circuits The calculated actual current values are compared The incoming currents from the main current transform- with the relay settings. If a phase current exceeds the ers on the protected object are converted to voltage pickup value, an alarm is given and after the set trip signals in proportion to the currents via the input trans- delay has elapsed, the corresponding trip relay is ac- formers and burden.
  • Page 12 Figure 4.3: TRIP/NO-TRIP region for directional element in MRI1. In this case the advance direction is defined as TRIP region and the reverse direction as NO-TRIP region. If line impedance and internal resistance of the gen- By means of accurate hardware design and by using erator is only ohmic: an efficient directional algorithm a high sensitivity for the voltage sensing circuit and a high accuracy for...
  • Page 13 Earth fault protection 4.4.1 Generator stator earth fault protection With the generator neutral point earthed as shown in figure 4.4 the MRI1 picks up only to phase earth faults between the generator and the location of the current transformers supplying the relay. Earth faults beyond the current transformers, i.e.
  • Page 14 Earth-fault directional feature (ER/XR-relay type) The residual voltage U required for determining earth A built-in earth-fault directional element is available for fault direction can be measured in three different applications to power networks with isolated or with ways, depending on the voltage transformer connec- arc suppressing coil compensated neutral point.
  • Page 15 Figure 4.6: Phase position between the residual voltage and zero sequence current for faulted and non-faulted lines in case of isolated ϕ systems (sin By calculating the reactive current component (sin ϕ - residual voltage - zero sequence current adjustment) and then comparing the phase angle in - capacitive component of zero sequence cur- relation to the residual voltage U , the ER/XR-relay...
  • Page 16 Determining earth short-circuit fault direction The SR-relay type is used in solidly-earthed or resis- tance-earthed systems for determining earth short-circuit fault direction. The measuring principle for determining the direction is based on phase angle measurement and therefore also on the coincidence-time measure- ment between earth current and zero sequence volt- age.
  • Page 17 Operation and setting Display Function Display shows Pressed push button Corresponding LED Normal operation Measured operating values Actual measured values, <SELECT/RESET> L1, L2, L3, E, U E> E> (related to I one time for each (XR-type related to % I Measuring range overflow max.
  • Page 18 Setting procedure After push button <SELECT/RESET> has been pressed, If, through a new setting, another relay characteristic always the next measuring value is indicated. Firstly other than the old one has been chosen (e.g. from the operating measuring values are indicated and then DEFT to NINV), but the time delay setting has not been the setting parameters.
  • Page 19 5.2.4 Reset setting for inverse time 5.2.8 Voltage transformer connection for tripping characteristics in the phase residual voltage measuring current path (3pha/e-n/1:1) To ensure tripping, even with recurring fault pulses Depending on the connection of the voltage trans- shorter than the set trip delay, the reset mode for in- former of ER/XR-relay types three possibilities of the verse time tripping characteristics can be switched residual voltage measurement can be chosen...
  • Page 20 5.2.15 Current setting for high set element 5.2.20 Nominal frequency of earth fault supervision (I E>> The adapted FFT-algorithm requires the nominal fre- quency as a parameter for correct digital sampling (Similar to chapter 5.2.5) The pickup value of X and XR-relay type relates to % I and filtering of the input currents.
  • Page 21 5.2.25 Blocking the protection functions and assignment of the output relays Blocking the protection functions: The relays are assigned as follows: LEDs I>, I>>, I E> The blocking function of the MRI1 can be set accord- are two-coloured and light up green when the out- E>>...
  • Page 22 Relay function Output relays Display- Lighted LED indication →← green I> (V) alarm _ 2 _ _ I>; →← green tI> (V) tripping 1 _ _ _ I> →← red I>> (R) alarm _ 2 _ _ I>>; →← red tI>...
  • Page 23 Setting value calculation Indication of measuring and fault values 5.3.1 Definite time overcurrent element 5.4.1 Indication of measuring values Low set element I> The pickup current setting is determined by the load The following measuring quantities can be indicated capacity of the protected object and by the smallest on the display during normal service: •...
  • Page 24 5.4.3 Fault memory (not for ER/XR types) When the relay is energized or trips, all fault data are Recorded fault values: stored in a non-volatile memory manner. The MRI1 is provided with a fault value recorder for max. eight Value displayed Relevant LED fault occurrences.
  • Page 25 Checking the set values Relay testing and commissioning By repeatedly pressing the push button <SELECT>, all relay set values may be checked. Set value modifica- The test instructions following below help to verify the tion can be done with the push button <+><-> and protection relay performance before or during commis- <ENTER>.
  • Page 26 6.4.2 Example of test circuit for MRI1 relays without directional feature For testing MRI1 relays without directional feature, only current input signals are required. Figure 6.1 shows a simple example of a single phase test circuit with adjustable current energizing the MRI1 relay un- der test.
  • Page 27 6.4.5 Checking the relay operating time 6.4.6 Checking the high set element of the relay To check the relay operating time, a timer must be connected to the trip output relay contact. The timer Set a current above the set operating value of I>>. In- should be started simultaneously with the current injec- ject the current instantaneously and check that the tion in the current input circuit and stopped by the trip...
  • Page 28 6.4.7 Example of a test circuit for MRI1 relay with directional feature Figure 6.2: Test circuit For testing relays with directional feature, current and In order to test the directional feature, all activation voltage input signals with adjustable phase shifting are points should first be set to “EXIT”.
  • Page 29 Current input Terminals Reference Terminals Display voltage S2/S1 Phase B3/B4 A5/A7 1.00 ±3% ±0.0 ±3% In +1.0 ±3% In B5/B6 A3/A7 1.00 ±3% ±0.0 ±3% In +1.0 ±3% In B7/B8 A3/A5 1.00 ±3% ±0.0 ±3% In +1.0 ±3% In B1/B2 A3/A2 1.00 ±5% +1.0 ±5% In...
  • Page 30 6.4.8 Test circuit earth fault directional feature Figure 6.3: Test circuit For testing relays with earth fault directional feature, With the aid of phase angle indicated on the display current and voltage input signals with adjustable the correct function of the relay can be checked (ER- phase shifting are required.
  • Page 31 6.4.9 Checking the external blocking and reset functions The external blocking input inhibits e. g. the function of Because of its powerful combined indicating and the high set element of the phase current. To test the measuring functions, the MRI1 relay may be tested in blocking function apply auxiliary supply voltage to the the manner of a primary injection test without extra ex- external blocking input of the relay (terminals E8/D8).
  • Page 32 Technical data Measuring input circuits Rated data: Nominal current I 1A or 5A Nominal voltage U 100 V, 230 V, 400 V Nominal frequency f 50 Hz; 60 Hz adjustable Power consumption in current circuit: at I = 1 A 0.2 VA at I = 5 A...
  • Page 33 Setting ranges and steps 7.3.1 Time overcurrent protection (I-Type) Setting range Step Tolerance ±3 % from set value or I> 0.2...6.0 x I 0.01; 0.02; 0.05; 0.1 x I min. ±2 % In ±3 % or ±10 ms tI> 0.03 - 260 s 0.01;...
  • Page 34 7.3.4 Earth fault protection (ER/XR-Type) Setting range Step Tolerance ±5 % from set value or > 0.01...0.45 x I (EXIT) 0.001; 0.002; 0.005; 0.01 x I ±0.3 % I (ER); ±0.03 % I (ER) 0.01%; 0.02%; 0.05%; 0.1% x I (XR) ±3 % or ±15 ms >...
  • Page 35 7.3.7 Inverse time overcurrent protection relay According to IEC 255-4 or BS 142 > Normal Inverse 0 02   −     > Very Inverse    −    > Extremely Inverse   ...
  • Page 36 Inverse time characteristics 1000 1000 I> 10.0 I> t[s] t[s] 10.0 0.05 0.05 5 6 7 8 9 10 5 6 7 8 9 10 Figure 7.3: Very Inverse Figure 7.1: Normal Inverse 1000 I> 0.02 t[s] t[s] > I> 10.0 0.03 I>>...
  • Page 37 Order form Time overcurrent relay MRI1- 3-phase meauring I>, I>> Rated current Phase fault directional feature Rated voltage 100 V 230 V 400 V Housing (12TE) 19”-rack Flush mounting RS485 Alternatively with Modbus Proto- Earth fault current relay MRI1- Earth current measuring standard very sensitive Rated current in earth circuits...
  • Page 38 Combinated time overcurrent and earth fault current relay MRI1- 3-phase measuring I>, I>> Rated current Phase fault directional feature Rated voltage 100 V 230 V 400 V Earth current measuring standard very sensitive Rated current in earth circuits Housing (12TE) 19”-rack Flush mounting RS485...
  • Page 39 Setting list MRI1 Note ! All settings must be checked at site and should the occasion arise, adjusted to the object / item to be protected. Project: SEG job.-no.: Function group: = Location: + Relay code: - Relay functions: Password:...
  • Page 40 Setting of code jumpers Code jumper Default setting Actual setting Default setting Actual setting Default setting Actual setting Plugged Not plugged Assignment of the output relays: Function Relay 1 Relay 2 Relay 3 Relay 4 Default Actual Default Actual Default Actual Default Actual...
  • Page 41 Assignment of the blocking function: Default setting Actual setting Function Blocking Not blocking Blocking Not blocking I> I>> E> E>> CBFP This technical manual is valid for software version: D01-8.10 (MRI1-ER; -IER; -IRER) D20-2.00 (MRI1-XR; -IXR; -IRXR) D24-1.00 (MRI1-X; -IX; -IXR) D00-8.10 (MRI1;...
  • Page 42 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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Mri1