13-36 BE1-951 Testing and Maintenance 9328900990 Rev L
Step 3: Apply A-phase voltage at nominal frequency and a value equal to the V/Hz multiple shown in
Table 13-46 (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 within ±2% of the
times shown in
Table 13-46.
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.
Overexcitation, 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.
Step 1: Using
Table 13-47 as a guide, transmit the setting commands to the relay.
Table 13-47. 24 Reset Time Test Settings
Setting 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
Step 2: Connect a 120 Vac, three-phase, 50 or 60-hertz voltage source (depending on user’s 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/Hz multiple shown in
Table 13-48. 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 Volts
per Hertz Overexcitation Protection, for more details). Reapplying the test voltage after 5
seconds will yield a trip time of approximately ½ its original value or 1.6 seconds for Time Dial
0.5, verifying that reset time delay is working.
Table 13-48. Reset Time
Multiple of V/Hz
Pickup
Time Dial 0.5 Time Dial 2.0 Time Dial 4.0
1.4 3.13 seconds 12.50 seconds 25 seconds
Step 4: Repeat the test for Time Dial 2.0 and 4.0 (½ 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 and Auxiliary Undervoltage/Overvoltage (27/59)
Purpose: To verify the operating accuracy of the 27P, 27X, 59P, 59X, and 159X protection elements.
Reference Commands: SL-27P, SL-27X, SL-59P, SL-59X, SL-159X, SL-VO, SL-GROUP, RG-STAT
Phase Undervoltage/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.
To Next Page
Loading...
Need help?
General