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Sep
25 2024PERFORMANCE STANDARD FOR GOVERNORS ON ENGINE GENERATOR SETS
1. SCOPE
This standard covers mechanical, hydraulic and electric governors used for controlling speed and/or
loading of engine-driven generator systems. The system may involve a single unit or multiple units
operating in parallel. It may serve as a prime or emergency standby power source. Operation may or may
not be in conjunction with an external power bus.
2. REFERENCE STANDARDS.0 REFERENCE STANDARDS
MIL.-STD.-705 B
Frequency and voltage regulation, stability and transient
response tests.
IEEE 100—1988
Standard Dictionary of Electrical and Electronic terms.
EGSA-101E—1984
Glossary of Standard Industry Terminology and
Definitions, Electrical.
EGSA-101M—1984
Glossary of Standard Industry Terminology and
Definitions, Mechanical.
EGSA-100M—1992
Performance Standard for Multiple Engine Generator Set
Control Systems.
3. DEFINITIONS.0 DEFINITIONS
3.1 Speed Governing System.
A speed governing system consists of a speed governor and fuel metering device which controls
the fuel supply to the engine. The speed governing system senses speed and perhaps load, and
meters the engine fuel supply such that speed tends to remain constant or to vary with load in a predetermined manner.
3.1.1 Speed Governor. The speed governor includes those elements which are directly
responsive to speed and/or load and which position or influence the action of a fuel
metering device to maintain the operating speed. When operating in parallel with an
independent power source such as the utility company, the governor will act to regulate
load.
3.1.2 Fuel Metering Device. A fuel metering device is an element directly or indirectly
positioned by the speed governor; e.g., variable displacement pumps, fuel metering pumps,
carburetors and other devices that meter fuel into the combustion system.
3.1.2 Fuel Metering Device. A fuel metering device is an element directly or indirectly
positioned by the speed governor; e.g., variable displacement pumps, fuel metering pumps,
carburetors and other devices that meter fuel into the combustion system.