Date Code 20010719
701 Motor Protection Relay
Section 10
Maintenance & Troubleshooting
Routine Maintenance Checks
Because the SEL-701 Relay is equipped with extensive self-tests, the most
effective maintenance task is to monitor the relay ALARM contact. The ALARM
output contact closes when the relay is deenergized or when relay self-tests fail. If you
are monitoring the ALARM contact, you know immediately if the relay is deenergized
or detects a failure. In addition, we recommend review of relay event reports following
faults. This review frequently reveals problems with equipment external to the relay
such as voltage transformers and control wiring.
The SEL-701 Relay does not require specific routine tests, but your operational
standards may require some periodic relay verification. If you need or wish to perform
periodic relay verification, we recommend the following checks.
Relay Status Verification
Use the front-panel Status of Relay or serial port
STATUS
command to verify that
the relay self-tests have not detected any out-of-tolerance conditions.
Meter Verification
Verify that the relay is measuring current signals and, if included, voltage signals
by comparing the relay meter reading to the reading of a separate meter connected in
series (for current circuits) or parallel (for voltage circuits) with the relay input.
Contact Input Verification
With the relay and motor off-line, short-circuit the individual relay contact inputs
using a wire jumper or the connected switch or contact. Using the front-panel View
Relay Word\Row 9 function, check the contact input status in the relay front-panel
display. As you short-circuit each input, its label (IN1, IN2, IN3, etc.) should appear in
the front-panel display.
Содержание SEL-701
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