High Voltage power transformer portable test system (using power
electronic frequency converter notion)
With the ability to perform the following tests:
circuit loss test
on on-load tap changers
Role and importance of this test:
Tests and measurements with sine wave high voltage has a vital role
in guaranteeing the health and quality of power transformers.
Normally these tests are performed in the frame of routine tests or
type tests after the installation and repairs and also for detecting the faults
of power transformers
Induced voltage test
This test is aimed at proving the electrical resistance of each
terminal of the line and the connected wiring to the ground and other wirings.
This test also proves the electrical resistance between phases and along the
windings under test (loop to loop installation).
Short circuit loss test
This test is conducted with the aim of proving matching of the
design of the winding with its manufacture.
On-load tap changers test
This test is conducted with the aim of control of the correct
performance of on-load tap changers.
No-load current and loss test
These losses are guaranteed by manufacturer and their compatibility
is proved by testing.
The references of these tests include:
disadvantages of the regular diesel-generator system (M/G) for use in the
in the diesel-generator system comes with a lot of limitations now that
according to standard, frequency should be doubled for level insulation
generators get self-excitation problem and their voltage is increased
uncontrollably. Maintenance, transportation and operation of Diesel-generators
come with more problems than the new system.
advantages of using the new system with the notion of utilizing power
electronic frequency converter
control and performing test in a simple way and the instant disconnection of
voltage in the case of probable accidents
frequency from 0 to 200 Hz
of increase of test voltage through exciting LN winding of transformer unders
test using intermediate transformer
wave form of test voltage with THD<%5
power compensation required for the test by varying the frequency
novel tests for power transformers that Akhtar Bargh Company is capable of.