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8.2 PRELIMINARY WORK
8.2PRELIMINARY WORK
1.
Review appropriate sections of this manual to familiarize yourself with the relay. Confidence in the commissioning pro-
cess comes with knowledge of the relay features and methods of applying settings.
2.
Verify the installation to ensure correct connections of all inputs and outputs.
3.
Review the relay settings and/or determine features and settings required for your installation. In large utilities a central
group is often responsible for determining which relay features will be enabled and which settings are appropriate. In a
small utility or industrial user, the on-site technical person is responsible both for the settings and also for the complete
testing of the relay.
4.
Set the relay according to requirements. Ensure that the correct relay model has been installed. A summary table is
available in this manual for users to record all the relay settings. When the testing is completed, users should verify the
applied relay settings, and verify that all desired elements have been enabled, using the 745PC software or the relay
front panel.
5.
Verify that the relay rated AC current matches the CT secondary value.
6.
Verify that the relay rated AC voltage matches the VT secondary value.
7.
Verify that the relay rated frequency setting matches the power system frequency.
8.
Open all blocking switches so as not to issue an inadvertent trip signal to line breakers.
9.
Verify that the auxiliary supply matches relay nameplate. Turn the auxiliary supply ON.
10. Verify that all grounding connections are correctly made.
To facilitate testing it is recommended that all functions be initially set to Disabled. Every feature which will be used in the
application should be set per desired settings, enabled for the specific commissioning test for the feature, then returned to
Disabled at completion of its test. Each feature can then be tested without complications caused by operations of other fea-
tures. At the completion of all commissioning tests all required features are then Enabled.
It is necessary to keep track of modifications/changes made to settings during the course of these com-
missioning steps and ensure that all settings are returned to the "in-service" values at the end of the tests,
prior to placing the relay into service.
CAUTION
8
8-4
Courtesy of NationalSwitchgear.com
745 Transformer Management Relay
8 COMMISSIONING
8.2.1 DESCRIPTION
GE Multilin
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