zero and adjust the engine-generator set frequency for the maximum
attainable frequency. Record instrument readings. Adjust the
engine-generator set frequency for the minimum attainable frequency.
Record instrument readings. The data sheet shall show the maximum and
minimum frequencies attained at rated load, and at no load.
2.6.3.4
Transient Response Test
Drop the load to no load and re-apply rated load three times to ensure that
the no load and rated load voltage and frequency values are repeatable and
that the frequency and voltage regulation is within the limits specified.
Record generator terminal voltage and frequency using a high speed strip
chart recorder. The data sheet shall show the following results:
a.
Frequency
1.
Stability bandwidth or deviation in percent of rated frequency.
2.
Recovery time.
3.
Overshoot and undershoot.
b.
Voltage
1.
Stability bandwidth or deviation in percent of rated voltage.
2.
Recovery time.
3.
Overshoot and undershoot.
PART 3
EXECUTION
3.1
INSTALLATION
Installation shall conform to the applicable requirements of IEEE C2 NFPA 30,
NFPA 37, and NFPA 70.
3.2
GROUNDING
**************************************************************************
NOTE: Where rock or other soil conditions prevent
obtaining a specified ground value, other methods of
grounding should be specified. Where it is
impractical to obtain the indicated ground
resistance values, make every effort within reason
to obtain ground resistance values as near as
possible to the indicated values.
**************************************************************************
NFPA 70 and IEEE C2, except that grounding systems shall have a resistance
to solid earth ground not exceeding 5 ohms.
3.2.1
Grounding Electrodes
Provide driven ground rods as specified in[ Section 16302N UNDERGROUND
TRANSMISSION AND DISTRIBUTION][ and][ Section 16301N OVERHEAD TRANSMISSION
AND DISTRIBUTION]. Connect ground conductors to the upper end of ground
rods by exothermic weld or compression connector. Provide compression
connectors at equipment end of ground conductors.
SECTION 16237N
Page 39
Previous Page
