IEEE C37.106 : 2003

GUIDE FOR ABNORMAL FREQUENCY PROTECTION FOR POWER GENERATING PLANTS

Institute of Electrical & Electronics Engineers

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1 Overview
  1.1 Scope
2 References
3 Definitions
4 Generator-transformer abnormal frequency capabilities and
  protection
  4.1 General background
  4.2 Generator over/underfrequency capability
  4.3 Generator and transformer overexcitation capability
  4.4 Generator-transformer volts per Hertz protection
5 Turbine abnormal frequency capabilities
  5.1 Turbine over/underfrequency capability
  5.2 Steam turbine over/underfrequency capabilities
  5.3 Combustion turbine over/underfrequency capabilities
  5.4 Over/underfrequency capabilities of combined cycle units
  5.5 Hydraulic turbine over/underfrequency capabilities
  5.6 Over/underfrequency operational limits for a steam turbine
6 Turbine abnormal frequency protection
  6.1 Underfrequency protection methods for steam turbines
  6.2 Load-shedding based underfrequency protection
  6.3 Protective system philosophy and criteria
  6.4 Turbine underfrequency protection relay schemes
  6.5 Combustion turbine underfrequency protection philosophy,
      relay settings, and guidelines
  6.6 Underfrequency protection considerations for combined-cycle
      generating units
7 Impact of abnormal frequencies on power plant auxiliaries
  7.1 Power plant auxiliaries - underfrequency considerations
  7.2 Bus transfer issues
  7.3 Nuclear plants - general background
8 System-wide issues
  8.1 System natural response
  8.2 Automatic generation control
  8.3 Islanding and underfrequency load shedding
  8.4 Generator underfrequency tripping
  8.5 Regional criteria
Annex A (informative) Bibliography
Annex B (informative) Regional criteria

Abstract

Helps the protection engineer in applying relays for the protection of generating plant equipment from damage caused by operation at abnormal frequencies including overexcitation. Emphasis is placed on the protection of the major generating station components at fossil steam generating stations, nuclear stations, and on combustion turbine installations.