GE P643 User Manual

3.9 Differential Biased Trip Logic 116
4 Harmonic Blocking 117
4.1 2nd Harmonic Blocking 117
4.2 2nd Harmonic Blocking Logic 118
4.3 5th Harmonic Blocking Implementation 118
4.4 5th Harmonic Setting Guideline 119
4.5 Geomagnetic Disturbances 119
4.6 Overall Harmonic Blocking Logic 119
5 Application Notes 121
5.1 Setting Guidelines 121
5.2 Example 1: Two-winding Transformer - No Tap Changer 122
5.3 Example 2: Autotransformer with Loaded Delta Winding 124
5.4 Example 3: Autotransformer with Unloaded Delta Winding 127
5.5 Setting Guidelines for Short-Interconnected Biased Differential Protection 130
5.6 Setting Guidelines for Shunt Reactor Biased Differential Protection 133
5.7 Setting Guidelines for using Spare CT Inputs 135
5.8 Setting Guidelines for Reference Vector Group 136
5.9 Stub Bus Application 137
5.9.1 Stub Bus Implementation 137
5.9.2 Stub Bus Scheme 138
5.10 Transformer Differential Protection CT Requirements 138
5.10.1 CT Requirements - Transformer Application 138
5.10.2 CT Requirements - Small Busbar Application 139
Chapter 7 Transformer Condition Monitoring 141
1 Chapter Overview 143
2 Thermal Overload Protection 144
2.1 Thermal Overload Implementation 144
2.1.1 Thermal Overload Bias Current 145
2.2 The Thermal Model 146
2.2.1 Top Oil Temperature Caculations 146
2.2.2 Hotspot Caculations 146
2.2.3 Thermal State Measurement 147
2.3 Application Notes 147
2.3.1 Alstom Recommendations 147
2.3.2 IEEE Recommendations 147
2.3.3 Data Provided by Transformer Manufacturers 148
3 Loss of Life Statistics 150
3.1 Loss of Life Implementation 150
3.1.1 Loss of Life Calculations 150
3.2 Application Notes 152
3.2.1 LOL Setting Guidelines 152
3.2.2 Example 152
4 Through Fault Monitoring 154
4.1 Through Fault Monitoring Implementation 154
4.2 Through Fault Monitoring Logic 155
4.3 Application Notes 155
4.3.1 TFM Setting Guidelines 155
5 RTD Protection 157
5.1 RTD Protection Implementation 157
5.2 RTD Logic 158
5.3 Application Notes 158
5.3.1 Setting Guidelines for RTD Protection 158
6 CLIO Protection 159
6.1 Current Loop Input Implementation 159
6.2 Current Loop Input Logic 161
Contents P64x
iv P64x-TM-EN-1.3

GE P643 Specifications

General

Brand	GE
Model	P643
Category	Relays
Language	English