Monitoring - ABB REU 610 Technical Reference Manual

1MRS755972
5.1.7.
5.1.8.
Voltage 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. The
overvoltage elements (59P-1, 59P-2 and 47), undervoltage elements (27P-1,
27P-2 and 27D) and residual overvoltage elements (59N-1 and 59N-2) have a
common trip counter each, whereas there is an own trip counter for 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
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