Trip Counters For Circuit-Breaker Condition Monitoring; Target Leds And Operation Target Messages; Demand Values - ABB REF610 Technical Reference Manual

REF610 REF610
5.1.7.
5.1.8.
5.1.9.
76
Feeder Protection Relay
Technical Reference Manual - ANSI Version

Trip counters for circuit-breaker condition monitoring

The trip counters for circuit-breaker condition monitoring provide history data,
which can be used for circuit-breaker service scheduling. With this information, the
service cycle can be estimated for the future.
The monitoring function consists of four counters, which count the number of trip
signals generated to the circuit breaker by the relay. Every time an element generates
a trip signal, the corresponding counter value is increased by one. The number of
trips is stored in the non-volatile EEPROM memory.
There are separate counters for the different protection elements because breaking
the current in different fault situations wears the circuit breaker differently. Each
overcurrent element (51-P, 50P-1 and 50P-2) has its own trip counter, whereas there
is a common trip counter for elements 51N, 50N, 46, 49, ARC and the external trip.
The counters can be read via the HMI or SPA parameters V9...V12 and cleared via
SPA parameter V166. When a counter reaches its maximum value, it rolls over.
In case several elements trip during the same fault sequence, only the
counter of the element which tripped first is increased by one.

Target LEDs and operation target messages

The operation of the relay can be monitored via the HMI by means of LED targets
and text messages on the LCD. On the front panel of the relay there are three target
LEDs with fixed functionality:
Green target LED (ready)
*
Yellow target LED (pickup/alarm)
*
Red target LED (trip)
*
In addition, there are eight programmable LEDs and an target LED for front
communication. Refer to the Operator's Manual for a more thorough presentation.
The target messages on the LCD have a certain priority order. If different types of
targets are activated simultaneously, the message with the highest priority appears
on the LCD.
The priority order of the operation target messages:
1. CBFAIL
2. Trip
3. Pickup/Alarm

Demand values

The relay provides three different kinds of demand values.
1MRS755535