Ashida ADR233B - Trip Circuit Supervision Alarm (W1;W2)

ADR233B
Doc ID : ADR233B/IM/01
Ref ID : ADR233B/IM/PS
Rev No. : 05
Page No. : 122 of 479
circuit breaker and trip circuit monitoring function, giving an indication of the position of the
circuit breaker contacts and trip circuit healthiness. This indication is available either on the relay
front panel or via the communications network.
The circuit breaker state monitoring function is available in CB CONTROL menu.
4.4.2 Trip Circuit Supervision Alarm (W1/W2):
The trip circuit supervision is used to monitor healthiness of circuit breaker. The trip circuit
extends beyond the relay enclosure and passes through more components, such as fuse, wires,
relay contacts, auxiliary switch contact and so on. The failure of any component results in to
bypassing the protection. The relay is provide with special trip circuit supervision function which
continuously monitor continuity of trip circuit and generate ALARM to take appropriate action.
The figure1 represents the logic implementation of Trip Circuit Supervision , It monitor continuity
of trip circuit through either normally open (NO) or normally close (NC) contact of CB connected
to opto isolator digital input assigned to TCS Trigger. If any discontinuity is observed, then the
relay generates TCS Alarm (W1 TCSAlm / W2 TCSAlm) after a set time delay an Alarm
message is displayed on LCD display and Event is stored in the Event Record.
-Ve
CBNO
CBNC
Circuit Breaker
+Ve
IN 1
IN 2
Trip Output Relay
Figure 1: Trip Circuit Supervision Principle Diagram
TCS
Trigger
TCS
Alarm
TCS
Timer
-Ve
Circuit Breaker
CB Status
Figure 2: Logic Diagram for Trip Circuit Supervision