Date Code 20001006 Breaker Monitor, Metering, and Load Profile Functions 8-1
SEL-351 Instruction Manual
SECTION 8: BREAKER MONITOR, METERING, AND LOAD
PROFILE FUNCTIONS
INTRODUCTION
The SEL-351 Relay monitoring functions include:
• Breaker Monitor
• Station DC Battery Monitor
In addition to instantaneous metering, the SEL-351 Relay metering functions include:
• Demand Metering
• Energy Metering
• Maximum/Minimum Metering
This section explains these functions in detail.
BREAKER MONITOR
The breaker monitor in the SEL-351 Relay helps in scheduling circuit breaker maintenance. The
breaker monitor is enabled with the enable setting:
EBMON = Y
The breaker monitor settings in Table 8.2 are available via the SET G and SET L commands (see
Table 9.1 in Section 9: Setting the Relay and also Settings Sheet 18 of 22 at the end of Section
9). Also refer to BRE Command (Breaker Monitor Data) and BRE n Command (Preload/Reset
Breaker Wear) in Section 10: Serial Port Communications and Commands.
The breaker monitor is set with breaker maintenance information provided by circuit breaker
manufacturers. This breaker maintenance information lists the number of close/open operations
that are permitted for a given current interruption level. The following is an example of breaker
maintenance information for a 25 kV circuit breaker.
Courtesy of NationalSwitchgear.com
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