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G60 Training

This document provides guidelines for testing the G60 protection relay used for generator protection. It describes the G60's functions including differential protection, over/under voltage and frequency protection, and voltage transformer failure protection. The guidelines give steps to test the digital inputs and outputs, current inputs, and specific protection elements. Developing an optimized testing procedure and documentation will help utilities verify their generator protection systems are operating safely and reliably.

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amir ghasemifare
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1K views2 pages

G60 Training

This document provides guidelines for testing the G60 protection relay used for generator protection. It describes the G60's functions including differential protection, over/under voltage and frequency protection, and voltage transformer failure protection. The guidelines give steps to test the digital inputs and outputs, current inputs, and specific protection elements. Developing an optimized testing procedure and documentation will help utilities verify their generator protection systems are operating safely and reliably.

Uploaded by

amir ghasemifare
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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G60 protection relay testing guide

1. Introduction

GENERATORS are the one of the most expensive components of the power system, as well as,
important components for stable and reliable operation of a power system. Functionality, settings and
equipment defects undetected by protective relays may lead to outages of generators that impose
unnecessary costs to power utilities, and stress the power system network for no reason.

Modern, microprocessor-based generator protection relays integrate many functions into a single
package. Each protection element is designed to detect a specific abnormal condition in the system
and to initiate a particular tripping sequence.

Therefore, the generator protection system needs to be tested carefully considering dependability,
reliability (operate reliably and fast during internal faults) and security (does not mis-operate for
external faults) aspects of the protective relaying system.

Periodic relay testing is, first and foremost, preventive maintenance. Thus, procedures and records
should be designed with preventive maintenance as the guide. The frequency of testing is subject to
many variables, including type of relay, environment, and of course, history and experience (every 3
years for digital relays and every year for static and electro mechanical relays). However, an annual
schedule of maintenance is a good starting point.

This policy describe the necessary steps to check the G60 protection relay. This type of protection is
mainly user for GE units. An interactive test sheet give the possibility to record all the test result and
existing setting.

This guide give the user all necessary steps to check the following function:

 Digital Output Test


 Digital Input Test
 AC System Input Test
 Generator Differential, 87G
 Current Unbalance , 46
 Loss of Excitation, 40

Prepared by: Engr. Anis ALHABIB BEN HAMMOUDA -QPP & Engr.Shams Ullah Dilawar Shah-GTSD 2
G60 protection relay testing guide

 Anti-Motoring with Accidental Energization and Sequential Trip Supervision, 32


 Time Overcurrent with Voltage Restraint, 51V
 Stator Ground , 64G
 Over-excitation (Volts/Hz), 24
 Overvoltage, 59
 Under-frequency, 81-U
 Over-frequency, 81-O
 Voltage Transformer Fuse Failure, VTFF
 Under-voltage, 27

Figure 1. G60 connection diagram

Part of the thesis is to create a user manual, which will guide the user in how to set up the test and in
how to test the G60 protective relay protective functions in a reliable and safe approach. The newly
developed procedure should result in optimization of time and in obtaining a test result, a test
document, which can guarantee the customer that their system is equipped with a safe and working
protection system

Prepared by: Engr. Anis ALHABIB BEN HAMMOUDA -QPP & Engr.Shams Ullah Dilawar Shah-GTSD 3

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