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GE P642 User Manual

GE P642
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3.2.3 APPLICATION NOTES
3.2.3.1 SETTING GUIDELINES
Following changes on the network caused by faults or other operational requirements, it is possible that various
subsystems will be formed within the pow
er network. It is likely that these subsystems will suffer from a
generation/load imbalance. The "islands" where generation exceeds the existing load will be subject to
overfrequency conditions. Severe over frequency conditions may be unacceptable to many industrial loads, since
running speeds of motors will be affected. The overfrequency element can be suitably set to sense this
contingency.
P64x Chapter 12 - Frequency Protection Functions
P64x-TM-EN-1.3 261

Table of Contents

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GE P642 Specifications

General IconGeneral
BrandGE
ModelP642
CategoryRelays
LanguageEnglish

Summary

MiCOM P40 Agile Technical Manual

Chapter 1 Introduction

Product Scope

Details the capabilities and models within the MiCOM P64x range of devices.

Chapter 2 Safety Information

Health and Safety

Outlines personnel qualifications and general safety practices for operating the equipment.

Installation, Commissioning and Servicing

Covers hazards related to lifting, electrical safety, and general installation procedures.

Chapter 4 Software Design

Protection and Control Functions

Explains the processing of protection elements and measurement functions by the software.

Chapter 5 Configuration

Using the HMI Panel

Details how to navigate menus, change settings, and use keypad functions via the HMI.

Configuring the Data Protocols

Explains how to configure communication settings for various protocols like Courier, DNP3, IEC 60870-5-103, Modbus, and IEC 61850.

Chapter 6 Transformer Differential Protection

Transformer Differential Protection Principles

Explains the current differential principle, through-fault stability, and bias current compensation.

Implementation

Details defining the power transformer, selecting current inputs, phase correction, and ratio correction.

Chapter 7 Transformer Condition Monitoring

Thermal Overload Protection

Details thermal overload protection, including the thermal model and bias current calculations.

Loss of Life Statistics

Explains the implementation and calculation of loss of life statistics based on thermal models.

Chapter 8 Restricted Earth Fault Protection

REF Protection Principles

Explains winding-to-core faults and the principles of REF protection for delta and star windings.

Restricted Earth Fault Protection Implementation

Details enabling REF protection, selecting current inputs, and low/high impedance REF principles.

Chapter 9 Current Protection Functions

Overcurrent Protection Principles

Explains the job of IEDs in protecting power systems from faults and IDMT characteristics.

Phase Overcurrent Protection

Details phase overcurrent protection implementation, including stages and directional elements.

Negative Sequence Overcurrent Protection

Explains the use of negative sequence overcurrent elements for unbalanced fault conditions.

Chapter 10 CB Fail Protection

Circuit Breaker Fail Protection

Explains the role of CBF protection in monitoring circuit breakers and ensuring fault isolation.

Application Notes

Provides setting guidelines for CB Fail timers and undercurrent elements.

Chapter 11 Voltage Protection Functions

Undervoltage Protection

Details undervoltage conditions and their implementation and logic.

Overvoltage Protection

Explains overvoltage conditions, implementation, logic, and setting guidelines.

Chapter 12 Frequency Protection Functions

Overfluxing Protection

Explains overfluxing conditions, implementation, logic, and setting guidelines.

Frequency Protection

Details underfrequency and overfrequency protection implementation and logic.

Chapter 14 Supervision

Voltage Transformer Supervision

Details the VTS function for detecting AC voltage input failures and blocking dependent protection.

Current Transformer Supervision

Explains CTS function for detecting AC current input failures and its impact on protection.

Trip Circuit Supervision

Describes TCS schemes for supervising trip coil and trip path status.

Chapter 16 Communications

Data Protocols

Lists supported data protocols including Courier, MODBUS, IEC 60870-5-103, DNP 3.0, and IEC 61850.

Chapter 17 Cyber-Security

Cyber-Security Implementation

Details current cyber-security measures at IED and external levels.

Chapter 19 Commissioning Instructions

Product Checks

Details product checks to ensure no physical damage, correct functionality, and tolerance compliance.

Chapter 20 Maintenance and Troubleshooting

Maintenance

Covers periodic checks, alarm status, opto-isolators, output relays, and measurement accuracy.

Troubleshooting

Guides on identifying error conditions, power-up errors, and mal-operation during testing.

Chapter 21 Technical Specifications

Performance of Transformer Differential Protection and Monitoring Functions

Provides accuracy specifications for transformer differential protection and monitoring functions.

Performance of Current Protection Functions

Details accuracy specifications for overcurrent, directional, and negative sequence protection.

Performance of Voltage Protection Functions

Specifies accuracy for undervoltage, overvoltage, residual overvoltage, and negative sequence voltage protection.

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