Circuit Breaker Condition Monitoring Sscbr; Identification; Application - ABB Relion 650 Series Applications Manual

Section 15
Monitoring
15.11

Circuit breaker condition monitoring SSCBR

15.11.1

Identification

Function description
Circuit breaker condition monitoring
15.11.2

Application

SSCBR includes different metering and monitoring subfunctions.
Circuit breaker status
Circuit breaker status monitors the position of the circuit breaker, that is, whether the breaker
is in an open, closed or intermediate position.
Circuit breaker operation monitoring
The purpose of the circuit breaker operation monitoring is to indicate that the circuit breaker
has not been operated for a long time. The function calculates the number of days the circuit
breaker has remained inactive, that is, has stayed in the same open or closed state. There is
also the possibility to set an initial inactive day.
Breaker contact travel time
High travelling times indicate the need for maintenance of the circuit breaker mechanism.
Therefore, detecting excessive travelling time is needed. During the opening cycle operation,
the main contact starts opening. The auxiliary contact A opens, the auxiliary contact B closes,
and the main contact reaches its opening position. During the closing cycle, the first main
contact starts closing. The auxiliary contact B opens, the auxiliary contact A closes, and the
main contact reaches its close position. The travel times are calculated based on the state
changes of the auxiliary contacts and the adding correction factor to consider the time
difference of the main contact's and the auxiliary contact's position change.
Operation counter
Routine maintenance of the breaker, such as lubricating breaker mechanism, is generally
based on a number of operations. A suitable threshold setting, to raise an alarm when the
number of operation cycle exceeds the set limit, helps preventive maintenance. This can also
be used to indicate the requirement for oil sampling for dielectric testing in case of an oil
circuit breaker.
The change of state can be detected from the binary input of the auxiliary contact. There is a
possibility to set an initial value for the counter which can be used to initialize this
functionality after a period of operation or in case of refurbished primary equipment.
Accumulation of I
Accumulation of I
current exponent. The factor y depends on the type of the circuit breaker. For oil circuit
breakers the factor y is normally 2. In case of a high-voltage system, the factor y can be 1.4...1.5.
234
IEC 61850
identification
SSCBR
y
t
y
t calculates the accumulated energy ΣI
© Copyright 2011 ABB Power Grids. All rights reserved
GUID-0FC081B2-0BC8-4EB8-9529-B941E51F18EE v5
IEC 60617 ANSI/IEEE C37.2
identification device number
- -
GUID-45572680-3A39-4B3C-8639-4E4C5A95AA26 v4.1.1
y
t where the factor y is known as the
Transformer protection RET650
1MRK 504 124-UEN B
Application manual