701 Motor Protection Relay Date Code 20010719
Metering & Monitoring
Motor Operating Statistics
8.10
Learned Parameters
The SEL-701 Relay can learn two protection parameters of the protected motor.
When you connect the relay to monitor at least one motor winding RTD and the
ambient temperature, the relay can learn the cooling time of the protected motor when
it is stopped. The relay can also learn the thermal element thermal capacity used when
the motor starts. The motor statistics report includes both of these learned parameters.
Alarm and Trip Counters
The relay records the number and type of element alarms and trips that occur for
the protected motor. The reported trip counter types are listed below. If the relay does
not include optional voltage or RTD inputs, the motor statistics report does not include
counter types for those elements. Those items marked with an (
A
) also have alarm
counters.
Thermal Element
A
Locked Rotor
A
Load Loss
A
Load Jam
Unbalance Current
A
Phase Fault
Ground Fault
Speed Switch
Undervoltage
Overvoltage
Underpower
A
Power Factor
A
Reactive Power
A
Phase Reversal
Underfrequency
Overfrequency
RTD
A
Total
A
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