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10 COMMISSIONING
10 COMMISSIONING 10.1 GENERAL
The procedures contained in this section can be used to verify the correct operation of the 745 Transformer
®
Management Relay
prior to placing it into service for the first time. These procedures may also be used to
verify the relay on a periodic basis. Although not a total functional verification, the tests in this chapter verify the
major operating points of all features of the relays. Before commissioning the relay, users should read Chapter
3: INSTALLATION, which provides important information about wiring, mounting, and safety concerns. The
user should also become familiar with the relay as described in Chapter 2: GETTING STARTED and Chapter
5: SETPOINTS.
Test personnel must be familiar with general relay testing practices and safety precautions to avoid personal
injuries or equipment damage.
This chapter is divided into several sections, as follows:
•
GENERAL: outlines safety precautions, conventions used in the test procedures.
•
TEST EQUIPMENT: the test equipment required.
•
GENERAL PRELIMINARY WORK
•
LOGIC INPUTS AND OUTPUT RELAYS: tests all digital and analog inputs, the A/D data acquisition sys-
tem, and relay and transistor outputs.
•
DISPLAY, METERING, COMMUNICATIONS, & ANALOG OUTPUTS: tests all values derived from the AC
current and voltage inputs.
•
PROTECTION SCHEMES: tests all features that can cause a trip, including differential, overcurrent, over
and underfrequency elements.
•
AUXILIARY PROTECTION/MONITORING FUNCTIONS
•
PLACING RELAY INTO SERVICE
The 745 is realized with digital hardware and software algorithms, using extensive internal monitoring. Conse-
quently, it is expected that, if the input circuits, CTs, VTs, power supply, auxiliary signals, etc., are functioning
correctly, all the protection and monitoring features inside the relay will also perform correctly, as per applied
settings. It is therefore only necessary to perform a calibration of the input circuits and cursory verification of
the protection and monitoring features to ensure that a fully-functional relay is placed into service.
Though tests are presented in this section to verify the correct operation of all features contained in the 745,
only those features which are placed into service need be tested. Skip all sections which cover features not
included or not enabled when the relay is in service, except for the proviso of the next paragraph.
Some features such as the Local/Remote Reset of targets, display messages and indications are common to
all the protection features and hence are tested only once. Testing of these features has been included with the
Harmonic Restraint Percent Differential, which will almost always be enabled. If, for some reasons, this ele-
ment is not enabled when the relay is in service, you will need to test the Local/Remote Reset when testing
another protection element.
GE Power Management
745 Transformer Management Relay
10.1 GENERAL
10.1.1 INTRODUCTION
10.1.2 TESTING PHILOSOPHY
10
10-1
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