Motor-generator sets for power transformer test laboratories
Motor-generator sets are intended for high-voltage and high-power test laboratories, primarily for factory test benches for power transformers.
- Output voltage frequency
- 50 / 60 / 200 Hz
- Purpose
- induced-voltage test (ACSD), partial discharge, short-circuit power
- Transformers under test
- three-phase and single-phase, power up to ≈20× the generator power
- Features
- reinforced damper winding, very low total harmonic distortion (THD)
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Motor-generator sets are intended for high-voltage and high-power test laboratories, primarily for factory test benches for power transformers. They serve as a power source at a frequency of 50, 60 or 200 Hz for induced-voltage testing and partial discharge measurement, for obtaining short-circuit power during transformer tests and, on request, circuit breaker tests, and in special cases for storing kinetic energy with an additional flywheel. Short-duration induced-voltage testing (ACSD) and partial discharge measurement are the most important checks of the insulation integrity of a transformer. They require a voltage as close as possible to sinusoidal and a frequency usually about twice the rated one, so that the magnetic core does not saturate at a test voltage above the rated one. The main requirement for the generators is therefore the lowest achievable total harmonic distortion (THD), so that the measurement results reflect the properties of the transformer rather than the harmonics of the source. The generators operate in a mode close to that of a synchronous compensator, which provides the necessary reactive power and voltage regulation quality; operating experience shows that transformers with a power about 20 times the rated power of the generator can be tested. For tests of both three-phase and single-phase transformers on one bench, the damper winding is reinforced: with a single-phase load the negative-sequence stator current induces in it a current of double frequency, much larger than under symmetrical load. The standard scope of supply includes a group of rotating machines with drive motor and generator, an oil system, a frequency converter with step-up and/or step-down transformers, excitation electronics, protection relays, current transformers, installation of the machines and commissioning of the excitation and protection systems. The design is adapted to the existing laboratory configuration; 3D design and modelling, factory tests of the generator and on-site measurement support are carried out. The Intelligent Solutions monitoring system and round-the-clock service are available.
Technical specifications
| Output voltage frequency | 50 / 60 / 200 Hz |
|---|---|
| Purpose | induced-voltage test (ACSD), partial discharge, short-circuit power |
| Transformers under test | three-phase and single-phase, power up to ≈20× the generator power |
| Features | reinforced damper winding, very low total harmonic distortion (THD) |
| Scope of supply | drive motor, generator, oil system, frequency converter with transformers, excitation, protection relays, current transformers |
| Options | flywheel for storing kinetic energy |
Request a price and lead time
Motor-generator sets for power transformer test laboratories. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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