6-2
Metering and Monitoring
Date Code 20010731
SEL-352-1, -2 Instruction Manual
Three-phase power is calculated based on the following:
P =
Real part of (IA•VXA + IB•VXB + IC•VXC) • (XPTR) • (CTR) / 1,000,000
Q
= Imaginary part of (IA•VXA + IB•VXB + IC•VXC) • (XPTR) • (CTR) / 1,000,000
Note
: Analog input angles must be considered for all phase-to-phase, power, and dV
calculations. Refer to
Section 1: Introduction and Specifications
for metering
accuracy.
B
REAKER
M
ONITOR
The SEL-352 Relay breaker monitor provides the following functions:
Electrical operate time
Mechanical operate time
Trip and close energy
Trip and close current
Breaker contact wear percentage (SEL-352-2 Relay)
Numerous alarms
Use the
BRE
(breaker monitor report) or
BRE S
(breaker monitor summary report) commands
to display breaker operation information on a per-pole basis, a breaker operation summary, and a
listing of breaker alarms. The operations and summary are stored in nonvolatile memory so the
relay retains these if power is removed from the relay. Loss of relay power causes erasure of
breaker alarms. Use the breaker operation report to analyze specific operations. Use the
summary to identify a breaker that may be slowing down or is ready for maintenance. The
breaker alarms report summarizes any occurrence of abnormal breaker conditions. An example
breaker report follows:
Содержание SEL-352-1
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