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TD_MRI1_06.05_GB

6.4.8

Test circuit earth fault directional feature

Figure 6.3:

Test circuit

For testing relays with earth fault directional feature,
current and voltage input signals with adjustable
phase shifting are required. Figure 6.3 shows an ex-
ample of a single phase test circuit with adjustable
voltage and current energizing the

MRI1

relay under

test.
For testing a relay with earth fault directional feature,
one of the input energizing quantity (voltage) shall be
applied to the relay with a constant value within its ef-
fective range. The other input energizing quantity (cur-
rent) and phase angle shall be appropriately varied.

With the aid of phase angle indicated on the display
the correct function of the relay can be checked (ER-
relay type).

Parameters I

E>

and I

E>>

should be set to EXIT.

The following measured values are shown:

Measured value

LED

Earth current

E, I

E>

Active share

E, I

P

reactive share

E, I

Q

Earth voltage

E, U

E>

Angel E,

I

E>

, U

E>

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Содержание HighTECH Line

Страница 1: ...CTION TECHNOLOGY MADE SIMPLE DIGITAL MULTIFUNCTIONAL RELAY FOR TIME OVERCURRENT PROTECTION HighTECH Line DIGITAL MULTIFUNCTIONAL RELAY FOR TIME OVERCURRENT PROTECTION Revision A Original document Engl...

Страница 2: ...for earth fault element tIE 5 2 14 Reset mode for inverse time tripping in earth current path 5 2 15 Current setting for high set element of earth fault supervision IE 5 2 16 Trip delay for high set...

Страница 3: ...h 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 p...

Страница 4: ...e measured values by using dis crete Fourier analysis to suppress the high frequence harmonics and DC components induced by faults or system operations Selectable protective functions between definite...

Страница 5: ...the connection has to be realized as per Figure 3 1 and Figure 3 2 Figure 3 3 Phase current measuring and earth current detection by means of Holmgreen circuit This connection can be used with three...

Страница 6: ...inally fed to the analog digital converter For the unit type with earth fault directional features ER XR relay type the residual voltage UE in the sec ondary circuit of the voltage transformers is int...

Страница 7: ...t 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...

Страница 8: ...X soli resi X X X tCBFP X X X X X X X X X X X 50 60 Hz X X X X X X X X X X X LED Flash X X X X X X X X X X X RS485 Slaveaddress X X X X X X X X X X X Baud Rate 3 X X X X X X X X X X X Parity Check 3...

Страница 9: ...RESET ENTER TRIP t I I E CHAR I t E I I E tI E EARTH E RS E DISPLAY Figure 3 8 Front panel MRI1 E X SELECT RESET ENTER TRIP t I I CHAR I tI I tI PHASE MRI1 IR L1 L2 L3 RS Q I P I DISPLAY Figure 3 9 F...

Страница 10: ...display At pickup trip and parameter setting the green LED lights up to indi cate the forward direction the red LED indicates the reverse direction The LED marked with letters RS lights up during sett...

Страница 11: ...induced transients or other system dis turbances The calculated actual current values are compared with the relay settings If a phase current exceeds the pickup value an alarm is given and after the s...

Страница 12: ...s at least 2 periods 40 ms at 50 Hz are evaluated For the MRI1 overcurrent relays with directional feature different time delays or time multipliers can be set for forward and backward faults ref to c...

Страница 13: ...ing the relay Earth faults beyond the current transformers i e on the consumer or line side will not be detected Figure 4 4 Generator stator earth fault protetion 4 4 2 System earth fault protection W...

Страница 14: ...n be measured in three different ways depending on the voltage transformer connec tions refer to Table 4 1 Total current can be measured by connecting the unit either to a ring core C T or to cur rent...

Страница 15: ...e current for faulted and non faulted lines in case of compensated systems cos UE residual voltage IE zero sequence current IL inductive component of zero sequence current caused by Petersen coil IC c...

Страница 16: ...earthed system are pre dominantly ohmic in character with a small inductive part The characteristic angle for these types of system has therefore been set at 170 in relation to the zero sequence volta...

Страница 17: ...E changeover of isolated sin or compensated cos networks for ER XR type SIN COS SELECT RESET Change over of solidly resistance earthed networks SR type SOLI RESI SELECT RESET Switch failure protection...

Страница 18: ...play The new setting value can then be changed by using push buttons If through a new setting another relay characteristic other than the old one has been chosen e g from DEFT to NINV but the time del...

Страница 19: ...cedure for forward or backward faults described in chapter 5 2 3 is also valid for the trip ping time of the high set element 5 2 7 Relay characteristic angle RCA The characteristic angle for directio...

Страница 20: ...rrents have dropped to 1 xIN within this time CB failure is detected and the related relay activated The CB failure protection function is deactivated again as soon as the phase currents have dropped...

Страница 21: ...ignment mode is selected The relays are assigned as follows LEDs I I IE IE are two coloured and light up green when the out put relays are assigned as alarm relays and red as tripping relays In additi...

Страница 22: ...R tripping X 1 _ _ _ tI red IE V alarm X _ _ _ 4 IE green tIE V tripping X 1 _ _ _ tIE green IE R alarm X _ _ _ 4 IE red tIE R tripping X 1 _ _ _ tIE red IE V alarm X _ _ _ 4 IE green tIE V tripping X...

Страница 23: ...multiplier setting for inverse time overcurrent is a scale factor for the selected characteristics The characteristics for two adjacent relays should have a time interval of about 0 3 0 4 s High set e...

Страница 24: ...indicate that it is not a current fault LEDs which were blinking blinking dur ing trip conditions element had picked up just briefly flash If the relay is still in trip condition and not yet reset TR...

Страница 25: ...cond part of the soft ware version of the relay e g 4 01 The software version should be quoted in all correspondence Press ing the TRIP button once more the display shows PSW Please enter the correct...

Страница 26: ...In By using an RMS metering instrument a greater deviation may be observed if the test current contains harmonics Be cause the MRI1 relay measures only the fundamental component of the input signals...

Страница 27: ...o times IS The tripping time may be red from the characteristic curve diagram or calculated with the equations given under technical data Please observe that during the secondary injection test the te...

Страница 28: ...directional feature of the relay and the current source is connected to phase 1 current input B3 B4 then the voltage source should be connected to relay terminals A5 A7 In order to test the directiona...

Страница 29: ...to red Relay 2 drops and relay 3 responds This test must be repeated for current inputs 12 and 13 In order to determine the direction in the earth current circuit SR version refer to Fig 8 with the ch...

Страница 30: ...ng a relay with earth fault directional feature one of the input energizing quantity voltage shall be applied to the relay with a constant value within its ef fective range The other input energizing...

Страница 31: ...e current and voltage transformers with the primary side energized Since the cost and poten tial hazards are very high for such a test primary in jection tests are usually limited to very important pr...

Страница 32: ...ly 4 x IN Thermal withstand in voltage circuit continuously 1 5 x UN 7 2 Common data Dropout to pickup ratio 97 Returning time 30 ms Time lag error class index E 10 ms Minimum operating time 30 ms Tra...

Страница 33: ...01 0 02 0 05 0 1 0 2 5 from set value or 0 3 IN 3 or 20 ms 3 of the measuring value of the current or 20ms see EN60255 3 IE tIE 0 01 15 x IN EXIT 0 03 2 0 s EXIT 0 001 0 002 0 005 0 01 0 02 0 05 0 1 0...

Страница 34: ...05 0 01x IN 0 01 0 02 0 05 0 1 x IN 0 01 s 0 02 s 0 05 s 5 from set value or 0 3 IN ER 0 03 IN XR 3 or 15 ms UE UN 100 V 3 PHA e n 1 70 V 1 1 1 120 V UN 230 V 3 PHA e n 2 160 V 1 1 2 300 V UN 400 V 3...

Страница 35: ...at I 1 x IN Connection angle 90 Characteristic angle 15 27 38 49 61 72 83 Effective angle 78 related to relay characteristic angle at UN 7 3 9 Determination of earth fault direction MRl1 ER XR Measure...

Страница 36: ...5 0 6 0 8 1 0 1 4 Figure 7 2 Extremely Inverse 1 2 3 4 5 6 7 8 910 20 I IS 0 1 1 10 100 1000 t s tI 10 0 8 0 6 0 4 0 3 0 2 0 0 05 0 1 0 2 0 3 0 4 0 5 0 6 0 8 1 0 1 4 Figure 7 3 Very Inverse 1 10 I IN...

Страница 37: ...X Rated current 1 A in earth circuits 5 A 1 5 Housing 12TE 19 rack Flush mounting A D RS485 Alternatively with Modbus Protocol M Earth fault current relay with directional feature MRI1 R Earth curren...

Страница 38: ...M Combinated time overcurrent and earth fault current relay with earth current directional feature MRI1 I R 3 phase measuring I I Rated current 1 A 5 A 1 5 Phase fault directional feature R Rated vol...

Страница 39: ...X X 0 01 x IN E 0 1 IN X WARN TRIP X X X X X X TRIP CHAR IE X X X X X X DEFT tIE V tIE R X X X X X X X X X 0 05 s ER XR 0 04 s others 0s 60 s earth X X X X X X 0 s IE X X X X X X X X X 0 01 x IN E 0 1...

Страница 40: ...y 4 Default setting Actual setting Default setting Actual setting Default setting Actual setting Default setting Actual setting I alarm V X tI tripping V X I alarm R X tI tripping R X I alarm V X t tr...

Страница 41: ...IE X TCBFP X 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 I E IE IR SR IRE ISR IRSR Modbus Version numbe...

Страница 42: ...D 47884 Kempen Germany Telephone 49 0 21 52 145 1 Internet www SEGelectronics de Sales Telephone 49 0 21 52 145 331 Fax 49 0 21 52 145 354 E mail info SEGelectronics de Service Telephone 49 0 21 52 14...

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