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REF 610
4.1.7.
4.1.8.
4.1.9.
64
Feeder Protection Relay
Technical Reference Manual
In case of loss of auxiliary power when the trip lockout function is in use, the
contacts of PO3 will return to the same state as before the loss, provided that the
battery has been inserted and is charged. If no battery has been inserted, the trip
lockout function will be activated and the contacts of PO3 will remain open when
the auxiliary power is switched on again.
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 REF 610. Every time a stage generates a
trip signal, the corresponding counter value will be increased by one. The number of
trips is stored in the non-volatile EEPROM memory.
There are separate counters for the different protection stages because breaking the
current in different fault situations wears the circuit breaker differently. Each
overcurrent stage (I>, I>> and I>>>) has its own trip counter, whereas there is a
common trip counter for stages I
CB Command) 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 will roll over.
Note!
In case several stages trip during the same fault sequence, only the counter of the
stage which tripped first will be incremented.
Indicator LEDs and operation indication messages
The operation of REF 610 can be monitored via the HMI by means of LED
indications and text messages on the LCD. On the front panel of the relay there are
three indicator LEDs with fixed functionality: a green indicator LED (ready), a
yellow indicator LED (start/alarm) and a red indicator LED (trip). In addition, there
are eight programmable LEDs and an indicator LED for front communication. Refer
to the Operator's Manual for a more thorough presentation.
The messages on the LCD have a certain priority order. If different types of
indications are activated simultaneously, the message with the highest priority will
appear on the LCD.
The priority order of the messages:
1. CBFP
2. Trip
3. Start/Alarm
Demand values
REF 610 provides three different kinds of demand values. The first value shows the
average current of all three phases measured during one minute. The value is
updated once a minute. The second value shows the average current during an
adjustable time range, ranging from 0 to 999 minutes, with an accuracy of one
>>, ∆I>, θ> and ARC, the AR function (Open
>, I
0
0
1MRS 755310
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