BE1-951
Testing and Maintenance
13-25
Command
Purpose
SL-51Q=1,0
Enables 51Q, disables blocking
SL-VO1=51PT
Enables OUT1 to close for 51P trip
SL-VO2=51NT
Enables OUT2 to close for 51N trip
SL-VO3=51QT
Ena bles OUT3 to close for 51Q trip
SG-CT=1
Sets CT ratio at 1
SG-TRIG=51PT+51NT+51QT,51PPU+51NPU+
51QPU,0
Enable 51PT or 51NT or 51QT to log and trigger
fault recording
EXITY;Y
Exit and save settings
Step 2 Transmit the appropriate commands in Table 13-24 for your sensing input type.
Table 13-24. 51 Pickup Commands
Sensing Type
Phase Commands
Neutral Commands
Negative Sequence
Commands
1 A
S0-51P=0.1,0.5,I2,N
S0-51N=0.1,0.5,I2,N
S0-51Q=0.1,0.5,I2,N
5 A
S0-51P=0.5,0.5,I2,N
S0-51N=0.5,0.5,I2,N
S0-51Q=0.5,0.5,I2,N
Step 3 Connect a current source to relay terminals D1 and D2 (A-phase). Using the values listed in Table
13-25 (Table value x3 for 51Q), apply the appropriate current values and measure the time between
the application of current and the closure of OUT1, OUT2 and OUT3. Verify that the relay performs
within the specified limits.
Table 13-25. 51 Timing Values
Sensing
Type
Time
Dial
Applied Current
Relay Trip Limits
Lower Limit
Higher Limit
1 A
0.5
0.15 A
0.748 seconds
0.827 seconds
0.50 A
0.19 seconds
0.24 seconds
2.5 A
0.1 seconds
0.15 seconds
5.0
0.15 A
7.244 seconds
8.007 seconds
0.50 A
1.798 seconds
1.988 seconds
2.5 A
0.944 seconds
1.044 seconds
9.9
0.15 A
14.318 seconds
15.825 seconds
0.50 A
3.535 seconds
3.907 seconds
2.5 A
1.844 seconds
2.038 seconds
