ABB Relion 670 Series Applications Manual page 259

1MRK 511 407-UUS Rev. J
tResetTempLO : This is used for the temperature lockout indication to reset after a set time delay
in s.
tResetTempAlm : This is used for the temperature alarm indication to reset after a set time delay in
s.
16.4 Breaker monitoring SSCBR
16.4.1 Identification
Function description
Breaker monitoring
16.4.2 Application
The circuit breaker maintenance is usually based on regular time intervals or the number of
operations performed. This has some disadvantages because there could be a number of
abnormal operations or few operations with high-level currents within the predetermined
maintenance interval. Hence, condition-based maintenance scheduling is an optimum solution in
assessing the condition of circuit breakers.
Circuit breaker contact travel time
Auxiliary contacts provide information about the mechanical operation, opening time and closing
time of a breaker. Detecting an excessive traveling time is essential to indicate the need for
maintenance of the circuit breaker mechanism. The excessive travel time can be due to problems
in the driving mechanism or failures of the contacts.
Circuit breaker status
Monitoring the breaker status ensures proper functioning of the features within the protection
relay such as breaker control, breaker failure and autoreclosing. The breaker status is monitored
using breaker auxiliary contacts. The breaker status is indicated by the binary outputs. These
signals indicate whether the circuit breaker is in an open, closed or error state.
Remaining life of circuit breaker
Every time the breaker operates, the circuit breaker life reduces due to wear. The wear in a breaker
depends on the interrupted current. For breaker maintenance or replacement at the right time, the
remaining life of the breaker must be estimated. The remaining life of a breaker can be estimated
using the maintenance curve provided by the circuit breaker manufacturer.
Circuit breaker manufacturers provide the number of make-break operations possible at various
interrupted currents. An example is shown in figure 95.
Phasor measurement unit RES670
Application manual
IEC 61850
identification
SSCBR
© Copyright 2017 Hitachi Power Grids. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
- -
Section 16
Monitoring
GUID-0FC081B2-0BC8-4EB8-9529-B941E51F18EE v7
GUID-45572680-3A39-4B3C-8639-4E4C5A95AA26 v10
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