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18
Field Testing and Commissioning
18.8
Energizing the
Protected Object
Place test switch in the operating position.
Prior to energizing the protected object, all relay
protection is placed in service. All secondary test sets
and equipment must be removed; all required CTs
connected.
18.8.1
In
Service Readings
-
In-service readings are taken to ensure system
reliability and security after the protected object is
energized and loaded.
1. Read and record the current magnitude and
phase angles in all leads and windings.
2. Check balance with meter. Trace any
abnormalities.
3. Verify all measurable quantities (inputs) through
the relay.
18.8.2
Operational Measured
Values
Check the steady state rms operating values to verify
that the relay is functioning properly. This information
is accessed directly in Address Blocks 5700 and 5900
and compared with actual known values. Compare the
known current values with the displayed test currents.
Figure 18.6
WinDIGSI Metering Data Screen
206
18.8.3
Measured Current Tests –
Address Block 4100
All current circuits were checked in the previous tests;
however the use may want to perform the measured
current test again under normal operating conditions.
Note: The differential protection and restricted
ground-fault protection are not effective during
the test. Backup protection must be present.
The relay measurement of all currents and phase
angles can be read through test Address Block 4100:
See Section 18.1 on page 195 through Section 18.6
on page 205 for detailed information related to the
measured current tests that follow.
Differential Current Test
Verify that the measured currents in each phase on
each side of the protected object, displayed in
Address 4101, are accurate. Note that the current is
referred to the rated current of the protected object.
Line Phase Angle Relations
Verify that the angle differences of the three currents
of Side 1, 2, and 3 are correct.
Differential and Stabilizing Current Check
Verify that the values in Address 4161 for the line
current differential, and the restraining currents are
accurate. The differential value should be negligible
against the magnitude of the line currents. The
stabilizing (restraint) value should be approximately
twice the line or test current value. Note that the
differential and stabilizing values are referred to the
rated current of the protected object.
Stop Test Operation- Address Block 4800
1. Access Address 4800 – COMMISSION TEST
STOP
2. Page to Address 4801 – Test Stop?
3. Enter the YES key
7UT51 v3
PRIM-2330C
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