N U M E R I C A L O C / E F P R O T E C T I O N R E L AY AD R 1 4 1 C / 2 4 1 C
ASHIDA Electronics Pvt. Ltd.
Ref: Manual / ADR141C / 241C
Issue: 04D
Date : 10.07.2014
Page
10/86
4.3
Trip circuit Supervision:-
The ADR141C is having 2 separate digital opto-coupler status input which can be used to
continuously monitor continuity of trip-circuit. The general scheme is as shown in fig. 4.
Relay monitor Trip coil continuity through CB NO during close condition and through CB NC
during Trip condition. If any discontinuity observed it generate Alarm signal.
The output can be assigned to any of 4 relay RL1 to RL4, The Trip circuit supervision logic
set reset PROTH (Protection healthy) bit, it normally ON and become OFF at following
condition
9
When DC supply is not sufficient (DC fail)
9
When CB NO and CB NC both active or both inactive. CB NO as well as CB NC are both
close or open.
9
Relay detects any internal hard ware Error.
B+
B-
TC
CB NO
CB NC
To Relay CPU
To Relay CPU
TCCOM
B+
B-
TC
CB NO
CB NC
Trip Circuit Logic
-
CB NO
-
1
2
1
2
6
6
B+
B-
TC
CB NO
CB NC
To Relay CPU
To Relay CPU
TCCOM
B+
B-
TC
CB NO
CB NC
Trip Circuit Logic
-
CB NO
-
1
2
1
2
6
6
4.4
Breaker Failure Detection:-
Normally after tripping current should become Zero within 100 – 200ms time depend upon
type of fault and breaker mechanism. After Fault ADR141C trigger internal timer (settable
from 50ms to 800ms) if fault is not cleared during this time then relay declare as Breaker fail
(LBB function) and set BF bit. This bit can be assigned to any of the output relay.
Breaker Fail Logic
OPERATION
BF
&
&
DELAY
50ms to 800ms
TRIP
GENERAL
BF ENABLE
Breaker Fail Logic
OPERATION
BF
&
&
DELAY
50ms to 800ms
TRIP
GENERAL
BF ENABLE
