Date Code 20010719 701 Motor Protection Relay
Metering & Monitoring
Motor Operating Statistics
8.9
Motor Operating Statistics
The SEL-701 Relay retains useful information regarding the protected motor. The
serial port MOTOR command and front-panel Motor Statistics commands make the
stored data available. The data also appear in the Modbus memory map. Items included
in the report are shown below.
NOTE: While the relay power is off, the elapsed timers do not
advance. If relay power is off for a significant time, the elapsed
calendar time will not match the elapsed time recorded by the
relay.
Times & Totals
The relay records the total time that the motor is running and stopped, then divides
the running time by the total time to indicate a percent time running. These figures
provide an indication of the amount of use that the motor is receiving. The relay also
records the total megawatt-hours consumed by the motor and the total number of motor
starts that have taken place.
Average & Peak Data
To help you discern operational trends early, the relay records the average and
peak of a number of key measurements, listed below. Some of these measurements are
dependent on the presence of optional voltage inputs and RTD inputs. The relay stores
average and peak values of:
Starting time in seconds.
Starting current.
Minimum starting voltage.
Starting % Thermal Capacity.
Running % Thermal Capacity.
RTD % Thermal Capacity.
Running current.
Running kW, kVAR, and kVA.
Hottest winding RTD temperature.
Hottest bearing RTD temperature.
Ambient RTD temperature.
Hottest other RTD temperature.
To Next Page
Loading...
