Woodward
Manual MRI3 GB
4
DOK-TD-MRI3 Rev.A
5.4.19
Circuit breaker failure protection tCBFP ................................................................... 36
5.4.20
Adjustment of the slave address .............................................................................. 36
5.4.21
Setting of Baud-rate (applies for Modbus Protocol only) .......................................... 36
5.4.22
Setting of parity (applies for Modbus Protocol only) ................................................. 36
5.5
Fault recorder ................................................................................................................... 37
5.5.1
Adjustment of the fault recorder ................................................................................... 37
5.5.2
Number of the fault recordings ..................................................................................... 37
5.5.3
5.5.3 Adjustment of trigger occurrences ....................................................................... 37
5.5.4
Pre-trigger time (Tpre) .................................................................................................. 37
5.6
Adjustment of the clock ..................................................................................................... 38
5.7
Additional functions ........................................................................................................... 38
5.7.1
Blocking the protection functions and assignment of the output relays ....................... 38
5.8
Setting value calculation ................................................................................................... 40
5.8.1
Definite time overcurrent element ................................................................................. 40
5.8.2
Inverse time overcurrent element ................................................................................. 41
5.9
Indication of measuring and fault values .......................................................................... 41
5.9.1
Indication of measuring values ..................................................................................... 41
5.9.2
Units of the measuring values displayed ..................................................................... 42
5.9.3
Indication of fault data ................................................................................................... 44
5.9.4
Fault memory ................................................................................................................ 44
5.10
Reset ................................................................................................................................. 45
5.10.1
Erasure of fault storage ............................................................................................ 45
6.
Relay testing and commissioning ............................................................ 46
6.1
Power-On .......................................................................................................................... 46
6.2
Testing the output relays and LEDs ................................................................................. 46
6.3
Checking the set values .................................................................................................... 46
6.4
Secondary injection test .................................................................................................... 47
6.4.1
Test equipment ............................................................................................................. 47
6.4.2
Example of test circuit for MRI3 relays without directional feature ............................... 47
6.4.3
Checking the input circuits and measured values ........................................................ 48
6.4.4
Checking the operating and resetting values of the relay ............................................ 48
6.4.5
Checking the relay operating time ................................................................................ 48
6.4.6
Checking the high set element of the relay .................................................................. 48
6.4.7
Example of a test circuit for MRI3 relay with directional feature ................................... 49
6.4.8
Test circuit earth fault directional feature ...................................................................... 51
6.4.9
Checking the external blocking and reset functions ..................................................... 52
6.4.10
Testing the external blocking with Block/Trip function .............................................. 52
6.4.11
Test of the CB failure protection ............................................................................... 52
6.5
Primary injection test ........................................................................................................ 53
6.6
Maintenance ..................................................................................................................... 53
7.
Technical data ............................................................................................ 54
7.1
Measuring input circuits .................................................................................................... 54
7.2
Common data ................................................................................................................... 54
7.3
Setting ranges and steps .................................................................................................. 55
7.3.1
Time overcurrent protection (I-Type) ............................................................................ 55
7.3.2
Earth fault protection (SR/YR-Type) ............................................................................. 55
7.3.3
Earth fault protection (E/X-Type) .................................................................................. 55
7.3.4
Earth fault protection (ER/XR-Type) ............................................................................. 56
7.3.5
Block/Trip – time ........................................................................................................... 56
7.3.6
Switch failure protection ................................................................................................ 56
7.3.7
Interface parameter ...................................................................................................... 56
7.3.8
Parameter for the fault recorder ................................................................................... 56
7.3.9
Inverse time overcurrent protection relay ..................................................................... 57
7.3.10
Direction unit for phase overcurrent relay ................................................................. 58
7.3.11
Determination of earth fault direction (MRl3-ER/XR)................................................ 58
7.3.12
Determination of earth fault direction (MRl3-SR/YR)................................................ 58
7.4
Inverse time characteristics .............................................................................................. 59
7.5
Output contacts ................................................................................................................. 62
8.
Order form .................................................................................................. 63