BE1-951
Testing and Maintenance
13-37
Step 2 Connect a 120 Vac, three-phase, 50 or 60-Hertz voltage source (depending on users nominal
frequency) to terminals C13 (A-phase), C14 (B-phase), C15 (C-phase) and C16 (Neutral). Refer
to Figure 13-1 for terminal locations.
Step 3
Apply A-phase voltage at nominal frequency and a value equal to the V/H multiple shown in Table
13-49 (example 1.0 V/H x 60 H = 60 volts x 1.4 = 84 volts). Measure the time between the
application of voltage and the closure of OUT1. Verify that the relay performs 2% of the
times shown in Table 13-49.
Step 4 Repeat the test for Time Dial 2.0 and 4.0.
Step 5 (Optional) Repeat Steps 2 through 4 for the B-phase and C-phase voltage inputs.
Step 6 (Optional) Repeat Steps 2 through 5 for setting groups 1, 2, and 3.
Over Excitation, Volts/Hertz Reset Time Verification
The following rest time test is an approximation. For a more precise test, use a computer driven test set and
the integration time equations found in Section 4,
Protection and Control, Voltage Protection, 24 Function.
Step 1 Using Table 13-47 as a guide, transmit the setting commands to the relay.
Table 13-47. 24 Reset Time Test Settings
Settings
Purpose
S0-24=1.0,0.5,0.1
Sets 24 PU at 1.0 V/H, Trip Time Dial=0.5, Reset Time Dial=0.1
Table 13-48. Reset Time
Multiple of
V/H Pickup
Time Dial 0.5
Time Dial 2.0
Time Dial 4.0
1.4
3.13 seconds
12.50 seconds
25 seconds
Step 2 Connect a 120 Vac, three-phase, 50 or 60-Hertz voltage source (depending on users nominal
frequency) to terminals C13 (A-phase), C14 (B-phase), C15 (C-phase) and C16 (Neutral). Refer
to Figure 13-1 for terminal locations.
Step 3
Apply A-phase voltage at nominal frequency and a value equal to the V/H multiple shown in Table
13-51. Measure the time between the application of voltage and the closure of OUT1. Remove the
test voltage and reapply after 5 seconds has elapsed.
With a Reset Time Dial setting of 0.1, the total time to reset, after trip is removed, will be
approximately 10 seconds (see Section 4,
Protection and Control, Voltage Protection, 24 Function
for more details). Reapplying the test voltage after 5 seconds will yield a trip time of approximately
1/2 its original value or 1.6 seconds for Time Dial 0.5, verifying that reset time delay is working.
Step 4 Repeat the test for Time Dial 2.0 and 4.0 (1/2 trip time is approximately 6.3 seconds for Time Dial
2.0, and 12.5 seconds for Time Dial 4.0
Step 5 (Optional) Repeat Steps 2 through 4 for the B-phase and C-phase voltage inputs.
Step 6 (Optional) Repeat Steps 2 through 5 for setting groups 1, 2, and 3.
Phase Undervoltage and Overvoltage Pickup Verification
Step 1
Prepare the 27P and 59P pickup functions for testing by transmitting the commands in Table 13-49
to the relay. Reset Targets.
Table 13-49. 27P and 59P Pickup Test Commands
Command
Purpose
A=
Gain write access
SL-N=NONE
Zero out custom logic settings. Overwrite with
logic=none settings.
Y
Confirm overwrite
