Breaker Health - GE 869 Instruction Manual

CHAPTER 4: SETPOINTS

Breaker Health

869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
The 869 relay provides breaker health information by monitoring and analyzing the
operation count, arcing energy of breaking current, arcing time, tripping time, closing time
and spring charging time if applicable. The breaker health status depends on many
factors, such as permissible operation number, magnitude of breaking current, mechanical
wear and contact wear.
The operation count is able to give direct information by comparing it with the permissible
operation number. The longer tripping time and closing time can provide an approximate
estimation of trip/close coils and mechanical wear. The increasing spring charging time
may imply developing problems in motor and spring mechanisms. Meanwhile, the
increase in arcing energy of the breaking current may reflect the possibility of contact
wear. Longer arcing time may suggest the loss of dielectric strength in the arc chamber. If
the arcing energy or any of the time intervals is above the related Pickup levels for the use-
defined times, the ALARM LED is lit.
The scheme is equipped with three incomplete sequence timers for Trip/Close time, arc
time and spring charge time respectively. So it automatically resets the related time
interval after the programmed delay.
A breaker operation function is also included, where breaker operation failure is caused by
either of the following conditions:
• The breaker does not respond to a Trip command within the programmed breaker
operation delay time.
• The breaker does not respond to a Close command within the programmed time.
Path:
Setpoints > Monitoring > Breaker 1 > Breaker Health
FUNCTION
Range: Disabled, Alarm, Latched Alarm, Configurable
Default: Disabled
MODE
Range: Detection, Monitoring
Default: Detection
The Breaker Health 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 set the Pickup settings based on the historical
true values. The operation count, arcing energy of the breaking current, arcing time,
tripping time, closing time and spring charging time are measured and displayed in
'Records/Breaker Health,' But the element does not pick up when in detection mode.
Monitoring mode is the normal mode, wherein measurements are analyzed and the
element may pick up accordingly.
PRESET TRIP COUNTER
Range: 0 to 100000 in steps of 1
Default: 0
This setting pre-sets the actual operation number when the relay is starting in service or
the record is cleared.
TRIP TRIGGER
Range: Off, Any FlexLogic operand
Default: Off
This setting assigns the trip initiation signal.
CLOSE TRIGGER
Range: Off, Any FlexLogic operand
Default: Off
This setting assigns the close initiation signal.
MONITORING
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