MIL-HDBK-1003/11
provide some type of power conditioning for many precise voltage and
frequency applications. The upgrading of the performance requirements for
generator sizes covered by NFGS-16208 to utility company requirements should
be justified by citing the reason, such as telecommunication, data
processing, hospital service, or utility company paralleling requirements.
Table 9
Speed Governing Performance Requirements
Electric Service Application
Performance Requirement
Industrial
Public
Precise
Commercial
Utility
Power
Specification Number
NFGS-16208
NFGS-16202,
None
Thru 16205
Basis for Specification
IEEE 126
IEEE 126
None
Section II
Section III,
As Upgraded
Steady-State
+/- 0.5%
+/- 0.25%
+/- 0.10%
Governing Speed Band
Recovery Time
4 Seconds
3 Seconds
1.5 Seconds
7.3 Controls. Monitoring and shutdown controls are necessary for unit
protection. Also needed are devices to start and stop the unit and to
select the operational mode when more than one method of operation is
provided.
7.3.1 Engine Fault Monitoring and Shutdown Controls. The minimum
requirements for protection of any diesel generator set incorporate the
following shutdown devices monitoring the engine:
a)
low lube-oil pressure with pre-alarm before shutdown,
b)
high water temperature with pre-alarm before shutdown, and
c)
overspeed.
Depending on the size of unit and the type of duty, additional
monitoring and shutdown controls, such as: monitoring cooling water
pressure, lube oil pressure of engine and turbocharger, high lube oil
temperature to engine and day tank level may be provided. The designer
should specify at least the devices recommended by the manufacturer of the
engine.
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