doble TDR9000 - Figure A.59 Reclose Trip Delay Operation; Figure A.60 O-C-O Contact 1 Make

TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 A-49
Monday, November 26, 2001 1:09 pm
The Instrument does not impose any special restrictions on Delay 1
Length, however, the following formula is useful:
Delay 1 Length < 55 ms + Trip Pulse
The default value is:
55 ms
The Delay 2 Length can be calculated as follows:
Delay 2 Length > 55 ms + (Trip pulse – Delay 1 Length)
The default value is:
Delay 2 Length = 55 ms + (66.6 ms – 55 ms) = 66.6 ms
Figure A.59 shows how the O-C-O Delay works.
Figure A.59 Reclose Trip Delay Operation
Contact 1 Make A trip command of a specified duration is applied to the circuit breaker at
time zero (Figure A.60). A close command of a specified duration is
applied to the circuit breaker delayed by a specified time (delay) after the
initiation of the trip command. The second trip command is initiated
when electrical closure is first detected on the Main Contact channel #1
(usually connected to contact #1 in Phase A) and is left on for the
duration of the test.
Figure A.60 O-C-O Contact 1 Make
delay2
delay 1
Trip C ommand
Close Command