Page 269 - Water Standards
P. 269
Table 4 2 13-1 (Continue)
No Item Provisions Explanation
(1 ) Before rotor assembly,
voltage tests shall be done ac⁃
cording to this specification; AC
voltage tests shall not be done
before the generator unit s
voltage has been raised;
(2) AC voltage tests shall be
done by phase. The starting
voltage should not be larger than
1 / 3 of the test voltage. The volt⁃
age shall be gradually raised to
the test voltage and the process
( 1 ) Test voltage shall
should take about 10 to 15s;
be 0 8 times the test
(3) All the temperature re⁃
voltage in the factory;
Stator coil AC sistances in the stator coils shall
5 ( 2 ) Corona onset
voltage test be short circuited and grounded
voltage of the whole unit
before testing;
shall be no less than the
(4) Insulation resistance and
rated line voltage
polarization indices shall be
measured and the DC voltage
test shall be done before the
test;
(5) During the voltage tests,
there shall be no obvious golden
light spots and connected corona
belts at the stator ends under the
rated line voltage. When the ele⁃
vation is above 1000m, the
starting voltage shall be revised
according to JB / T 8439
2 The items and requirements of rotor coil tests shall meet the provisions of Table
4 2 13-2
2 6 2