ABB REF610 Technical Reference Manual

Also see for RELION REF610: Technical reference manual Operator's manual Technical reference manual Product guide

Contents

ABB REF610 Technical Reference Manual Manual pdf 76 page image

5.1.7. Trip counters for circuit-breaker condition monitoringThe trip counters for circuit-breaker condition monitoring provide history data,which can be used for circuit-breaker service scheduling. With this information, theservice cycle can be estimated for the future.The monitoring function consists of four counters, which count the number of tripsignals generated to the circuit breaker by the relay. Every time an element generatesa trip signal, the corresponding counter value is increased by one. The number oftrips is stored in the non-volatile EEPROM memory.There are separate counters for the different protection elements because breakingthe current in different fault situations wears the circuit breaker differently. Eachovercurrent element (51-P, 50P-1 and 50P-2) has its own trip counter, whereas thereis 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 viaSPA parameter V166. When a counter reaches its maximum value, it rolls over.In case several elements trip during the same fault sequence, only thecounter of the element which tripped first is increased by one.5.1.8. Target LEDs and operation target messagesThe operation of the relay can be monitored via the HMI by means of LED targetsand text messages on the LCD. On the front panel of the relay there are three targetLEDs 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 frontcommunication. 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 oftargets are activated simultaneously, the message with the highest priority appearson the LCD.The priority order of the operation target messages:1. CBFAIL2. Trip3. Pickup/Alarm5.1.9. Demand valuesThe relay provides three different kinds of demand values.76REF610REF610 Feeder Protection RelayTechnical Reference Manual - ANSI Version1MRS755535