Date Code 20151029 Protection Manual SEL-411L Relay
Section 9
P.Protection Manual
Monitoring and Metering
The relay provides extensive capabilities for monitoring substation
components and metering important power system parameters. The relay
provides the following useful features:
➤ Circuit Breaker Monitor on page P.9.1
➤ Station DC Battery System Monitor on page P.9.20
➤ Metering on page P.9.25
This section explains each of these features and gives practical examples for
applying these features in the power system.
Circuit Breaker Monitor
The relay features advanced circuit breaker monitoring.
This subsection is organized as follows.
➤ Overview on page P.9.1
➤ Enabling the Circuit Breaker Monitor on page P.9.2
➤ Circuit Breaker Contact Wear Monitor on page P.9.3
➤ Other Circuit Breaker Monitor Functions on page P.9.9
➤ BREAKER Command on page P.9.16
Overview
The relay features advanced circuit breaker monitoring. Figure 9.1 shows that
the relay processes phase currents, circuit breaker auxiliary contacts, and the
substation dc battery voltages to detect out-of-tolerance and maximum life
circuit breaker parameters. These parameters include current interrupted,
operating times, and contact wear. By using relay monitoring, maintenance
personnel can determine the extent of a developing circuit breaker problem
and select an appropriate response to correct the problem. These monitoring
features are available online in real-time; you can detect impending problems
immediately. The result is better power system reliability and improved circuit
breaker life expectancy.
One of the many circuit breaker monitor features is the circuit breaker contact
wear monitor. The relay tracks the number of circuit breaker close-open
operations and respective fault interrupting levels for each of two circuit
breakers. The relay uses data from the circuit breaker manufacturer to
compare the recorded operational data with the manufacturer’s recommended
maintenance requirements. The relay notifies you when each set of circuit
breaker pole contacts exceeds preset wear thresholds. Using this information,
you can operate your substation more economically by accurately scheduling
circuit breaker maintenance.
NOTE: This section lists settings for
Circuit Breaker 1; settings for Circuit
Breaker 2 are similar; replace 1 in the
setting with 2.
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