GE MiCOM P40 Agile User Manual

10.4.1 Fifth Harmonic Blocking 119
10.5 Logic for Feeders with In-Zone Transformers 120
10.6 Second Harmonic Blocking Logic 121
10.7 Fifth Harmonic Blocking Logic 122
11 Current Differential Intertripping 123
12 Stub Bus Differential Protection 124
13 Application Notes 125
13.1 Setting Up the Phase Differential Characteristic 125
13.2 Sensitivity Under Heavy Loads 126
13.3 Permissive Intertripping 127
13.4 CT Ratio Correction Setting Guidelines 127
13.5 Feeders with Small Tapped Loads 128
13.6 Setting a Two-Terminal Phase Current Differential Element 128
13.7 Setting a Three-Terminal Phase Current Differential Element 129
Chapter 7 Distance Protection 133
1 Chapter Overview 135
2 Introduction 136
2.1 Distance Protection Principle 136
2.2 Performance Influencing Factors 136
2.3 Impedance Calculation 137
2.4 Implementation with Comparators 137
2.5 Polarization of Distance Characteristics 137
3 Distance Measuring Zones Operating Principles 138
3.1 Mho Characteristics 139
3.1.1 Directional Mho Characteristic for Phase Faults 139
3.1.2 Offset Mho Characteristic for Phase Faults 139
3.1.3 Directional Self-Polarized Mho Characteristic for Earth Faults 140
3.1.4 Offset Mho Characteristic for Earth Faults 142
3.1.5 Memory Polarization of Mho Characteristics 144
3.1.6 Dynamic Mho Expansion and Contraction 144
3.1.7 Cross Polarization of Mho Characteristics 147
3.1.8 Implementation of Mho Polarization 148
3.2 Quadrilateral Characteristic 149
3.2.1 Directional Quadrilaterals 150
3.2.2 Earth Fault Quadrilateral Characteristics 154
3.3 Quadrilateral Characteristic for Phase Faults 162
3.3.1 Phase Fault Impedance Reach Line 163
3.3.2 Phase Fault Reverse Impedance Reach Line 163
3.3.3 Phase Fault Resistive Reach Line 164
3.3.4 Phase Fault Reverse Resistive Reach Line 166
3.3.5 Phase Fault Quadrilateral Characteristic Summary 166
4 Phase and Earth Fault Distance Protection Implementation 168
4.1 Phase Fault Characteristics 168
4.2 Earth Fault Characteristics 168
4.3 Distance Protection Tripping Decision 168
4.4 Distance Protection Phase Selection 169
4.4.1 Faulted Phase Selection 169
4.5 Biased Neutral Current Detector 170
4.6 Distance Element Zone Settings 171
4.6.1 Directionalizing the Distance Elements 171
4.6.2 Advanced Distance Zone Settings 172
4.6.3 Distance Zone Sensitivities 172
4.7 Capacitor VT Applications 173
4.7.1 CVTs with Passive Suppression of Ferroresonance 173
4.7.2 CVTs with Active Suppression of Ferroresonance 173
4.8 Load Blinding 174
Contents P543i/P545i
iv P54x1i-TM-EN-1

GE MiCOM P40 Agile Specifications

General

Brand	GE
Model	MiCOM P40 Agile
Category	Control Unit
Language	English