Test Plan Items
A-48 72A-1898 Rev. A 11/01
Monday, November 26, 2001 1:09 pm
The delay value is calculated as follows:
The default values are:
Figure A.57 shows how the O-C-O with a Standing Delay works.
Figure A.57 O-C-O Delay Operation
Delay A trip command of a specified duration is applied to the circuit breaker
at time zero (Figure A.58). A close command of a specified duration is
applied to the circuit breaker delayed by a specified time interval
(Delay 1 Length) after the initiation of the trip command. The second trip
command is applied to the circuit breaker that is delayed by a specified
time interval (Delay 2 Length) after the initiation of the close command,
and is left on for the remainder of the test.
Figure A.58 Reclose Trip Delay
For 60 Hz Delay > 55 ms + (Trip pulse – 8.3 ms)
For 50 Hz Delay > 55 ms + (Trip pulse – 10 ms)
60 Hz 50 Hz
Trip Pulse 66.6 ms 80 ms
Close Pulse 133.3 ms 160 ms
Delay 55 ms + (66.6 ms – 8.3 ms) = 113.3ms 55 ms + (80 ms – 10 ms) = 125 ms
delay
Trip C ommand
Close Command
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