GE 745 Instruction Manual page 239

GE
Grid Solutions
7.1 General
7.1.1 Introduction
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
745 Transformer Protection
Chapter 7: Commissioning
Commissioning
The procedures contained in this section can be used to verify the correct operation of the
745 Transformer Protection System 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 the installation
chapter, which provides important information about wiring, mounting, and safety
concerns. The user should also become familiar with the relay as described in the setpoints
and actual values chapters.
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
analog-to-digital data acquisition system, 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
• SETPOINT TABLES
System
7–1