Schweitzer Engineering Laboratories SEL-701, Instruction Manual

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701 Motor Protection Relay
Date Code 20010719
Metering & Monitoring
Motor Start Trending
8.14
Motor Start Trending
Each time the relay stores a motor start report, it adds the motor start summary
data (described in Summary Data ) to the motor start trending buffer. The motor start
trending function tracks motor start summary data for the past eighteen 30-day periods.
For each 30-day interval, the relay records the date the interval began, the total number
of starts in the interval, and the averages of the following quantities:
Motor Acceleration Time.
Starting % Thermal Capacity.
Maximum Starting Current.
Minimum Starting Voltage (if voltages are present).
View the motor start trending data using the serial port MST command.
NOTE
: All the trend data collected each day are added to
nonvolatile memory at midnight. If relay power is removed,
the information collected between midnight and power
removal is lost.
Figure 8.5 shows data from an example Motor Start Trend Report.
=>mst
SEL-701 Date: 08/27/1999 Time: 10:35:49.755
MOTOR RELAY
Began Number Accel Starting Maximum Minimum
Record on of Time % Thermal Current Voltage
Number Date Starts (s) Capacity (A pri) (VL-L pri)
1 08/02/1999 25 9.8 73 3002 4706
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Figure 8.5 Motor Start Trending Report Example.