Ashida ADR233B - CB CONTROL Operation (W1;W2)

ADR233B
Doc ID : ADR233B/IM/01
Ref ID : ADR233B/IM/PS
Rev No. : 05
Page No. : 124 of 479
CB Open
Time
W1CBOpnSp
CB Trip
Protection Trip
W1CB
(52B)
AND
Gate
Figure 3: Logic Diagram for W1 CB Open Supervision Alarm
W2CBOpnSp is also asserted same as the winding 2 side
4.4.3.2 CB Open Operation Alarm (W1/W2):
For each circuit breaker trip operation, the relay records statistics. CB Operations Displays the
number of opening commands executed by the CB. Every operation of a circuit breaker results
in some degree of wear for its components. Thus, routine maintenance, such as oiling of
mechanisms, may based upon the number of CB operations. The relay ADR233B monitor the
circuit breaker operation maintain by two type of counters, one is TC “Breaker Trip counter”
which will increment when relay provide trip command based on operation of protection function
and second one is W1 BOC / W2 BOC “Breaker Opening Counter” will increment when the state
CB W1CB (52B) Opto I/P change low to high (which is connected to CB NC Contact). The relay
compare winding 1 “Breaker Opening counter” with “CB Open operations” setting when counter
cross the set value relay generate CB Open Operation ALARM “W1CBOprAL”, indicating when
preventative maintenance is due. An Alarm message is displayed on LCD display and the start
LED starts blinking & event is stored in Event Record.
4.4.4 CB CONTROL Operation (W1/W2):
The Circuit Breaker (CB) can be control either locally through Relay HMI or remotely through
SCADA system Type of Control operation can be set from “CB Control ” menu (i.e. Disable,
Local, Remote or Local + Remote) in the “W1 CB CONTROL menu” .
For CB OPEN command:
Once CB Open command is received from locally or remotely, the assigned relay contact to the
W1 CB (52B) will operate, simultaneously the relay starts monitoring Status of opto input CB
TRIP, if the status of W1 CB (52B) is not active within “tCB open pulse time” (settable in the
range of 0.1 to 50 sec), then relay generate “W1OpnFail” on LCD display and event will be
stored in Event Record. The ALARM can be assign to any LED or relay output.
The operation of Open Fail is explained in following diagram: