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Generator Protection Application Guide
Introduction
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| Generator Protection Application Guide |
This guide was developed to assist in the selection of relays to protect a generator. The purpose of each relay is described and related to one or more power system configurations. A large number of relays is available to protect for a wide variety of conditions. These relays protect the generator or prime mover from damage. They also protect the external power system or the processes it supplies. The basic principles offered here apply equally to individual relays and to multifunction numeric packages.
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The engineer must balance the expense of applying a particular relay against the consequences of losing a generator. The total loss of a generator may not be catastrophic if it represents a small percentage of the investment in an installation. However, the impact on service reliability and upset to loads supplied must be considered. Damage to and loss of product in continuous processes can represent the dominating concern rather than the generator unit.
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Table Of Contents
Introduction
Ground Fault Protection
Loss-of-Field Protection
Thermal Protection
Loss of VT Detection
Overexcitation and Over/Under Voltage Protection
Off-Frequency Operation
Inadvertent Energization Protection
Negative Sequence Protection
Selective Tripping and Sequential Tripping
Out of Step Protection
Synchronism Check and Auto Synchronizing
Integrated Application Examples
Application of Numerical Programmable Relays
Typical Settings and Relays
Generator Protection Application Guide
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