NR Electric PCS-9611, Instruction Manual, Page: 282 / 300

12 Commissioning
PCS-9611 Feeder Relay
12-10
Date: 2014-04-08
NOTE! The IDMT overcurrent protection with other characteristic inverse curves can be
checked through the same method. Note to set the relevant characteristic and logic
settings correctly.
12.5.3.4 Zero Se quence Overcurrent Protection Check
This check, performed the No.1 stage 1 zero sequence overcurrent protection function in the No.1
setting group, demonstrates that the relay is operating correctly at the application -specific settings.
1. Enable the No.1 stage 1 zero sequence overcurrent protection.

Set the logic setting [50/51G1.En
] as “1” in the submenu “
EF1 Settings
”.

Set the setting [50/51G1.OutMap
] as “0x0001” in the submenu “
EF1 Settings
”.
 Set other logic settings as “0” in the submenu “
EF1 Settings
”.

Set the setting [Opt_3I0
] as “0” in the submenu “
System Settings
”.
2. De-energize all the binary inputs of this relay.
3. Simulate a normal condition, the external input current of the zero sequence CT is less than
0.95 × [50/51G1.3I0_Set].
4. Simulate a single-phase earth fault, the external input current of the zero sequence CT is
greater than 1.05 × [50/51G1.3I0_Set].
5. After the period of [50/51G1.t_Op], the No.1 stage 1 zero sequence overcurrent protection will
operate and issue the trip command. The “
TRIP
” LED indicator will be on; a relevant report
will be shown on the LCD.
6. After the fault is disappeared, this relay will restore the No.1 stage 1 zero sequence
overcurrent protection automatically. Restore the “
TRIP
” indicator and the LCD manually.
NOTE! Another way for testing the zero sequence overcurrent protection is using the
self-calculated zero sequence current.
12.5.3.5 Sensitive Earth Fault Protection Check
This check, performed the stage 1 sensitive earth fault protection function in the No.1 setting
group, demonstrates that the relay is operating correctly at the application -specific settings.
1. Enable the stage 1 sensitive earth fault protection.

Set the logic setting [50/51SEF1.En
] as “1” in the submenu “
SEF Settings
”.

Set the setting [50/51SEF1.OutMap
] as “0x0001” in the submenu “
SEF Settings
”.
 Set other logic settings as “0” in the submenu “
SEF Settings
”.
2. De-energize all the binary inputs of this relay.
3. Simulate a normal condition, the external input current of the sensitive zero sequence CT is