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Trip Circuit Supervision; Trip Circuit Supervision Scheme; Resistor Values - GE MiCOM P40 Agile Technical Manual

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Chapter 15 - Supervision
4

TRIP CIRCUIT SUPERVISION

In most protection schemes, the trip circuit extends beyond the IED enclosure and passes through components
such as links, relay contacts, auxiliary switches and other terminal boards. Such complex arrangements may
require dedicated schemes for their supervision.
There are two distinctly separate parts to the trip circuit; the trip path, and the trip coil. The trip path is the path
between the IED enclosure and the CB cubicle. This path contains ancillary components such as cables, fuses and
connectors. A break in this path is possible, so it is desirable to supervise this trip path and to raise an alarm if a
break should appear in this path.
The trip coil itself is also part of the overall trip circuit, and it is also possible for the trip coil to develop an open-
circuit fault.
This product supports a number of trip circuit supervision (TCS) schemes.
4.1

TRIP CIRCUIT SUPERVISION SCHEME 1

This scheme provides supervision of the trip coil with the CB open or closed, however, it does not provide
supervision of the trip path whilst the breaker is open. The CB status can be monitored when a self-reset trip
contact is used. However, this scheme is incompatible with latched trip contacts, as a latched contact will short out
the opto-input for a time exceeding the recommended Delayed Drop-off (DDO) timer setting of 400 ms, and
therefore does not support CB status monitoring. If you require CB status monitoring, further opto-inputs must be
used.
Note:
A 52a CB auxiliary contact follows the CB position. A 52b auxiliary contact is the opposite.
+ve
Trip Output Relay
V01214
Figure 177: TCS Scheme 1
When the CB is closed, supervision current passes through the opto-input, blocking diode and trip coil. When the
CB is open, supervision current flows through the opto-input and into the trip coil via the 52b auxiliary contact.
This means that Trip Coil supervision is provided when the CB is either closed or open, however Trip Path
supervision is only provided when the CB is closed. No supervision of the trip path is provided whilst the CB is open
(pre-closing supervision). Any fault in the trip path will only be detected on CB closing, after a 400 ms delay.
4.1.1

RESISTOR VALUES

The supervision current is a lot less than the current required by the trip coil to trip a CB. The opto-input limits this
supervision current to less than 10 mA. If the opto-input were to be short-circuited however, it could be possible for
the supervision current to reach a level that could trip the CB. For this reason, a resistor R1 is often used to limit the
current in the event of a short-circuited opto-input. This limits the current to less than 60mA. The table below
shows the appropriate resistor value and voltage setting for this scheme.
Trip Circuit Voltage
48/54
350
Trip path
Blocking diode
R1
Opto-input
Opto Voltage Setting with R1 Fitted
24/27
Trip coil
52A
52B
Circuit Breaker
Resistor R1 (ohms)
1.2k
P14x
-ve
P14xEd1-TM-EN-1

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