BHEL Hyderabad is equipped with all modern test facilities including data loggers and signal analyzers to carryout tests as specified by IEEE-115, IEC 60034, IS-7132 & IS-7306. Facilities for maintaining rated hydrogen pressure in case of hydrogen cooled generators are also available.
Following are the routine tests generally carried out on all the generators
- Over speed test of rotor before assembly at 120% rated speed for 2 minutes in balancing tunnel as in-process test
- Measurement of Capacitance and tan δ of stator winding as in-process test
- Mechanical run and measurement of mech. losses & vibrations at rated speed
- Measurement of mech. losses, short circuit characteristic up to 100% In & Cu. losses
- Measurement of mech. losses, open circuit characteristic up to 120% En & core losses
- Evaluation of Efficiency by separation of losses method
- Measurement of shaft voltage
- Checking of phase sequence
- Measurement of rotor impedance (rotor inside stator)
- Measurement of DC resistances of Stator and Rotor Windings in cold condition
- Measurement of DC resistances and insulation resistance of RTDs
- Measurement of Polarisation Index of stator winding
- Measurement of insulation resistance of stator and rotor windings before and after High Voltage test (M/c at rest)
- High Voltage test of stator and rotor windings (M/c at rest)
Following are the prototype tests carried out on 1st machine of a new design
- Heat run tests (No load, 110% OCC & 100% SCC)
- Harmonics in Line-Line voltage
- 3-Phase sudden short circuit test at 30% En
- Line to Line sustained short circuit test
- Line to Line to Neutral sustained short circuit test
- Retardation test
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