GE Power Management 750/760 Feeder Management Relay 17-
3
17 COMMISSIONING 17.2 PRELIMINARIES
17
17.2.3 TEST EQUIPMENT REQUIRED
Excluding the tests which check the data acquisition of AC system currents and voltages, tests may be per-
formed using the powerful simulation feature of the relay, without the need of external AC voltage and current
inputs. System parameters, such as current and voltage phasor information, are entered as setpoints. When
placed in simulation mode, the relay suspends reading actual AC inputs, and uses the programmed phasors to
generate sample values which are placed in the Trace Memory. All metering calculations and logic associated
with protection, monitoring, and control, are performed normally, using phasors calculated from the samples
placed in the memory instead of phasors generated from the input parameter data acquisition system. The
advantage of using simulation is that all metering calculations can be proven without the inaccuracies associ-
ated with current and voltage sources.
Assuming that the simulation feature is not used, the following equipment is necessary to perform any test
included in this chapter:
General Purpose:
•3
φ
variable AC current and voltage source (V, A,
φ
, Hz)
•3
φ
power multimeter (V, A,
φ
, Hz, W, var, VA, Wh, varh, PF)
• variable DC mA source
• accurate timing device
• multimeters
Specific Purpose:
• Synchrocheck requires two single phase variable voltage sources with adjustable frequency and phase.
• Underfrequency requires a dynamic relay test set with at least two preset modes.
• Distance-to-fault: requires a dynamic relay test set with at least three preset modes.
• Analog Input Rate-of-Change requires a DC current generator with the capacity to generate current ramps
adjustable for duration’s from 1 minute to 2 hours, from 0-20 mA.
Optional:
• PC running the 750/760 PC program.
17.2.4 INSTALLATION CHECKS
1. Check that the relay phase current inputs, specified on the nameplate, are correct for the connected cur-
rent transformers.
2. Check that the relay ground current input, specified on the nameplate, is correct for the connected current
transformer (if applicable).
3. Check that the relay auxiliary voltage, specified on the nameplate, is correct for the supplied voltage.
4. Check that the installed relay agrees with the drawings, particularly the Analog Output range.
5. Check that the external wiring is correct.
6. Check
that all grounding terminals of the relay are properly connected to the ground bus.
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