GE P742

Commissioning
P74x/EN CM/Na7
MiCOM P741, P742, P743
(CM) 10-1
CM
CONTENTS
1. INTRODUCTION 3
2. SETTING FAMILIARISATION 4
3. EQUIPMENT REQUIRED FOR COMMISSIONING 5
3.1 Minimum equipment required 5
3.2 Optional equipment 5
4. PRODUCT CHECKS 6
4.1 With the relay de-energised 6
4.1.1 Visual inspection 7
4.1.2 Current transformer shorting contacts 7
4.1.3 Insulation 9
4.1.4 External wiring 9
4.1.5 Watchdog contacts 10
4.1.6 Auxiliary supply 10
4.2 With the relay energised 11
4.2.1 Watchdog contacts 11
4.2.2 Date and time 11
4.2.3 Light Emitting Diodes (LEDs) 12
4.2.4 Field voltage supply 14
4.2.5 Input opto-isolators 14
4.2.6 Output relays 14
4.2.7 Rear communications port 15
4.2.8 Second rear communications port 16
4.2.9 Current differential communications 19
4.2.10 Current inputs (P742, P743 only) 19
5. COMMISSIONING TEST MENU 21
5.1 Test mode 21
5.1.1 Test mode for PU 21
5.1.2 Test mode for CU 21
5.2 Busbar Monitoring (only in CU) 22
5.3 Busbar (BB) & Circuit Breaker Fail (CBF) Disable (only in CU) 22
6. SETTING CHECKS 23
6.1 Apply application-specific settings 23
6.2 How to measure the Burden Resistance (R
B
) 24
6.2.1 RB
ph
/ RB
N
is close to 1 25
6.2.2 RB
Ph
/ RB
N
is close to 3 26
6.3 Demonstrate Correct Relay Operation 26
6.3.1 Current Differential Bias Characteristic 26
6.3.2 Phase Overcurrent Protection (P742 and P743) 30
6.3.3 Breaker Failure Protection 31
6.4 Check Application Settings 34