30kv 0.24kv-0.085kv 5000kVA Electric Arc Furnace Transformer Special Transformers for Furnace

1. Top three in China, advanced performance
2. CE, IEC, ANSI
3. ISO, OHSAS
4. Up to 150MVA

Brief specification
1)       Voltage class: 6~110 KV
2)       Capacity : 630 KVA to 120,000 KVA
3)       Short-circuit impedance : 4.5~21%
4)       Losses : No-load losses is fully comply with IEC standard requirements

Winding .

The winding must be especially protected – both against high electrical stress due to

external over voltages and against mechanical overloads by short circuits. They are made of copper or aluminum. Low-voltage windings are made of strip or flat wire while

high voltage windings are manufactured from round or profile wire. (“diamond-dotted paper”) bonds the winding into a compact block

while drying and increases the short-circuit capacity additionally.

Magnetic Core lamination.

The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel lamination insulated on both sides,

guaranteeing low losses and low noise. These values are even improved by laser treatment. It is protected on the surface with a

flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.

Test lab
Testing are conducted for every transformer before delivery.Tests are classified to be routine tests and type test.
A – Routine tests: According to IEC 60076 standard , the following tests must be carried out for all units of the transformers
a- Measurement of winding resistance .
b- Measurement of voltage ratio and check of phase displacement.
c- Measurement of short circuit impedance and load losses.
d-Measurement of no-load losses and current .
e-Dielectric routine tests including the separate source AC voltage withstanding test and short duration induced over voltage withstanding test ( ACSD ) .

C – Special tests :
a- Determination of noise level according to IEC 60551 .
b- Oil leakage test
c- Overload test at 150 % rated current for one hour after temperature rise test ( top oil temperature rise and winding temperature rise must be measured and recorded in the report test also hot spot temperature rise must be calculated and recorded on the report test ) .
d- Short Circuit Dynamic stability Test (test report from independent and accredited laboratory for similar transformer will be accepted).

Ville Electric Company will keep up with the century, the epoch,Sincerely look 

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