Isolation power transformers for excitation systems 640–4000 VA, primary voltage up to 13.8 kV
Isolation power transformers rated from 640 to 4000 VA supply voltage regulators and generator excitation systems. The primary voltage ranges from 80 V to 13,800 V, with a frequency of 50–400 Hz in the low-voltage versions. They galvanically isolate the power circuits of the regulator from the generator network.
- Power
- 640–4000 VA
- Primary voltage
- 80 V; 208/240, 416/480, 600 V; 2400/4160, 3300/6600, 7200, 13,800 V
- Frequency
- 50–400 Hz (LV versions); 50–60 Hz (HV versions)
- Built-in fuses
- primary, for some 5 kV class versions
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Isolation power transformers are designed to work together with voltage regulators and excitation systems in low and high voltage generator installations. They convert the generator voltage into the voltage required to power the regulator and at the same time galvanically isolate the power circuits of the regulator from the generator network. The transformers have been manufactured since the 1960s in a wide range of voltage configurations.
The low-voltage versions cover 640 VA with primary voltages of 240/480, 416/480 and 600 V (50–400 Hz), 720 VA with a primary of 80 V (50–400 Hz) or 240/480 and 600 V (50–60 Hz), 900 VA and 2400 VA with primaries of 240/480 and 600 V, and 1000, 1200 and 2000 VA with primaries of 208/240 and 416/480 V or 600 V (50–400 Hz). The high-voltage versions are rated 1000 and 1680 VA with a primary of 2400/4160 V, 2000 VA with a primary of 3300/6600 V, and 4000 VA with a primary of 2400/4160 V, 7200 V or 13,800 V (50–60 Hz).
The frequency range of 50–400 Hz allows the transformers to be used in installations with increased frequency, for example on aviation and military generators. Certain versions of the 5 kV class have built-in primary fuses, so separate high-voltage fuses do not have to be bought and installed, and installation is simpler. The transformers are compatible with the DECS-150, DECS-250 and DECS-250N regulators, the SGC-250 and SGC-250N synchronous generator controllers and the analog regulators APR63-5, AVC63-12 and AVC125-10. The transformer is selected by the generator voltage and by the power consumed by the regulator or excitation system. For stationary 50–60 Hz installations standard versions are sufficient, and for increased frequency the 50–400 Hz versions are used.
Medium-size transformers and Class 2 transformers are made at the plant in Piedras Negras (Mexico) using automated processes. In addition to the standard range, transformers can be made to individual orders. Applications include excitation systems of generators in diesel and gas-piston stations, small hydropower plants and industrial CHP plants, synchronous motors, and the modernization of voltage regulators on generators of 2.4–13.8 kV.
Technical specifications
| Power | 640–4000 VA |
|---|---|
| Primary voltage | 80 V; 208/240, 416/480, 600 V; 2400/4160, 3300/6600, 7200, 13,800 V |
| Frequency | 50–400 Hz (LV versions); 50–60 Hz (HV versions) |
| Built-in fuses | primary, for some 5 kV class versions |
| Purpose | power supply of voltage regulators and excitation systems |
Replacement for
isolating transformers ОСМ1, ТСЗИ; ТСП (for excitation systems)
selected by purpose and main parameters, please confirm with our manager
Request a price and lead time
Isolation power transformers for excitation systems 640–4000 VA, primary voltage up to 13.8 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What power and primary voltage range do these transformers have?
Power ranges from 640 to 4000 VA. Primary voltage ranges from 80 V in the low-voltage versions to 13,800 V in the high-voltage versions.
Which frequencies are the low-voltage and high-voltage versions intended for?
Low-voltage versions operate at 50–400 Hz, and for some configurations at 50–60 Hz. High-voltage versions are rated for 50–60 Hz.
Are there built-in fuses?
Yes, certain versions of the 5 kV class have built-in primary fuses, so separate high-voltage fuses are not needed.
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