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M3 BREAKER MAINTENANCE
Breaker health
7–14
The 339 relay provides breaker health information by monitoring and analyzing the
tripping time, closing time and the spring charging time. The breaker health status
depends on many factors, such as number of permissible operations, magnitude of
breaking current, mechanical wear, and contact wear.
The operation count provides direct information when compared to the maximum number
of permissible breaker operations. Longer tripping times and closing times can provide an
estimation of trip/close coil mechanical wear. An increased spring charging time may give
early notice of developing problems in motor and spring mechanisms.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
MAINTENANCE > M3 BKR MAINTENANCE > BKR HEALTH
BREAKER HEALTH FUNCTION
Range: Disabled, Alarm, Latched Alarm
Default: Disabled
For details see
Common
BREAKER HEALTH MODE
Range: Detection, Monitoring
Default: Detection
The Breaker HEALTH function has two running modes, detection and monitoring. Since
the monitored time intervals differ for different breaker types and manufacturers, the
detection mode can be used to help users configure the pickup settings based on
historical true values. The tripping time, closing time, and spring charging time are
measured and displayed under
Counter element does not pick up when in detection mode. Monitoring mode is the
normal mode, where measurements are analyzed and the element picks up accordingly.
ALARM COUNTER LIMIT
Range: 0 to 100000 in steps of 1
Default: 0
This setting selects count limit for the alarm counter above which the Breaker Alarm
Counter function will pick up and produce an alarm.
The alarm counter is increased if any of the following conditions are present:
–
The actual breaker trip time is higher than the preset TRIP TIME PICKUP
–
The actual breaker closing time is higher than the preset CLOSE TIME PICKUP
–
The actual spring charging time is higher than the preset CHARGE TIME PICKUP
TRIP TIME PICKUP
Range: 0.00 to 10.00 s in steps of 0.01 s
Default: 0.05 s
This setting defines the pickup level of the Trip time. The Trip time interval is initiated by
the TRIP TRIGGER signal and stopped by OPEN STATUS signal.
The trip time of the breaker is detected based on the trip or open command issued by
the relay, and the detection of breaker open status.
CLOSE TIME PICKUP
Range: 0.00 to 10.00 s in steps of 0.01 s
Default: 0.05 s
This setting defines the pickup level of the Close time. The Close time interval is initiated
by the CLOSE TRIGGER signal and stopped by CLOSE STATUS signal.
The close time of the breaker is detected based on the close command issued by the
relay, and the detection of breaker close status.
setpoints.
MAINTENANCE > M4 BKR MONITOR
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: MAINTENANCE
. The Breaker Alarm
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