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BHEL,
Hyderabad is equipped with all modern facilities for testing
of Generators and exciters. At different stages of manufacturing,
process tests are conducted on the Generator and Exciter components
and after completion of manufacturing of generators and exciters,
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The
following tests on Turbogenerators and Exciters are performed
for healthiness of insulation.
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1)
Insulation resistance measurement.
2) DC High voltage tests.
3) Interturn insulation test by comparison of RLC waveform.
4) Interstrip insulation test on Stator half coils.
5) 50 Hz AC high voltage test.
6) Capacitance and tan delta measurement on stator bars and
stator winding.
7) DLA measurement on stator winding.
8) Partial Discharge measurement on stator winding.
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In
addition to the above Ring flux on stator core for ascertaining
no interlaminar short. .DC resistance measurement of the windings
is measured for healthiness of brazing and connections.
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All
the machines manufactured are tested for routine tests .Prototype
test are performed on the first machine of the type machine.
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following are routine tests on GENERATOR. |
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1)
Mechanical run test and vibration measurement.
2) Short circuit characteristic and losses measurement.
3) Open circuit characteristic and loses measurement
4) Phase sequence check.
5) Shaft voltage measurement
6) Impedance measurement at standstill, at 1/3,2/3 and 3/3
of rated speeds.
7) Insulation Resistance measurement on stator and Rotor winding.
8) PI value measurement.
9) High Voltage Test on stator and rotor winding.
10) RTDs Checks.
11) DC Resistance measurement on stator and rotor winding.
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following additional tests are performed on the prototype machine
in addition to routine tests. |
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(1)
Mechanical Heat run test.
(2) Short circuit heat run test.
(3) Open Circuit heat run test.
(4) Wave form Analysis and THF measurement
(5) Line to Line sustained short circuit test for evaluation
of -ve sequence reactance.
(6) Line to line and neutral sustained Short Circuit test
for evaluation of Zero sequence reactance.
(7) Residual voltage measurement.
(8) Retardation test for determination of GD
(9) 3-phase sudden short circuit test and evaluation of machine
parameters ( Reactances and time constants).
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facilities are available for testing of the machines. |
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1)
Three numbers of ward - Leonard sets and three numbers of
Thyristor convertor systems for DC source for Driving motors
used for Driving Generators and for excitation during testing.
2) Four DC Drive motors with Step up gear boxes.
3) Lube Oil system for lubrication of bearings and gear boxes
and cooling water system for coolers.
4) Seal oil system for Hydrogen cooled machines.
5)
Water load resistance bank for Load test of Brushless Exciters
6) 60 Hz AC source testing.
7) Three numbers of maintenance free battery stations for
DC voltage requirements during testing.
8) 3-phase resistance load bank for testing of permanent Magnet
Generators.
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