Date Code 20020129
Testing and Troubleshooting
10-11
SEL-387E Instruction Manual
Frequency Metering
Step 1.
Purpose: Verify frequency metering.
Method: Use
the
METER
command to measure the frequency applied in Voltage
Metering Step 1. The displayed frequency should equal the applied
frequency ±0.01 Hz
.
Volts/Hertz Metering
Step 1.
Purpose: Verify volts/hertz metering
Method: Use
the
METER
command to measure the volts/hertz applied in Voltage
Metering Step 1. The displayed volts/hertz should equal the following
±1%:
nom
sec
V
•
freq
•
10
NFREQ
•
PTR
•
V
•
3
Hertz
/
Volts
=
V
sec
=
Secondary Voltage (applied)
PTR
=
Potential transformer ratio (Setting)
Freq =
Frequency
(applied)
NFREQ
=
Nominal Frequency (Setting)
V
nom
=
Nominal Voltage in kV (Setting)
Winding Overcurrent
Each winding overcurrent element that is to be tested must be enabled. Enable the overcurrent
elements for a particular winding with the EOC1, EOC2, and EOC3 settings for Windings
1, 2, and 3, respectively. Setting these to “Y” enables the overcurrent elements for the
corresponding winding. The pickup settings for each overcurrent element must also be set to a
pickup value. If they are not set to a value, but are set to “OFF,” that particular overcurrent
element is disabled.
Instantaneous Overcurrent Elements
Note:
This example tests the Winding 1 50P11 phase overcurrent element. Use the same
procedure to test all instantaneous overcurrent elements for each winding.
Содержание SEL-387E
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