Key attributes

Usage：Power

Phase：Three

Coil Structure:TOROIDAL

Coil Number:Three-phase Two-winding

Place of Origin:Zhejiang, China

Model Number:SFZ11-20000/30-10

Type:Two winding

Service Condition:Indoor/Outdoor

Tap Changer:Nltc/Oltc

Cooling Type:Ofwf/Onan

Core Structure:Toroidal

High Voltage Range:30-110kv

Iron Core:Silicon Sheet

Frequency:50Hz/60Hz

Bushing:Porcelain

Winding Material:Copper

Product Description

30KV power transformer is popular world wide in different industry. It is impact and cost-effient.

Transformer and reactor in lab

Reactor under test

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 ) .

B - Type tests : The following tests shall be carried out

a- Temperature rise test

b- Lightning impulse test

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).

Test Procedure sample

1.Leak testing with pressure for liquid-immersed transformers Oil test

1) Color/Appearance

2) Oil dielectric loss tanδ

3) Break down voltage of oil

4) Dissolved gas analysis in oil

2.Measurement of voltage ratio and check of phase displacement

3.Measurement of winding resistance

4.Measurement of dissipation factor (tanδ) of the insulation system capacitances, and determination of capacitances

5.windings-to-earth and between windings.

6.Measurement of d. c. insulation resistance between each winding to earth and between windings

7.Measurement of no-load loss and current at 90%, 100%, 110% of rated voltage

8.Measurement of short-circuit impedance and load loss

9.Applied voltage test

10.Induced voltage test

11.Frequency response analysis-FRA test

12.Temperature-rise test

13.Sound level/noise test

14.Lighting impulse test

15.Operation impulse test

Packing&Shipping

Wooden cases/crates iron structure

Accessories are packed in a welded steel structure before packing on wood plates.

Polywood crates.

Polywood crates are applied for packing to accessories and small distribution transformers.

Loading transformer to truck

SHENDA has 75 tons and 50 tons crane for lifting transformers.

Steel structures protection

Small distribution transformers are packed in a welded steel structure before packing on wood plates.

Nude transformer mainbody

All drivers and truck have certificate to drive in China.Lashing chains are fixed at trucks robustly.Nitrogen or oil is filled for main body.

Transport to port.

All trucks are approved and certified to carry heavy cargos in china, transport from Jiangshan to shanghai or ningbo takes 6 hours.

Transformer oil tank

Oil tank filled with oil for filling after arrival on site.This tank is made by shenda and can be reused on site.

Terminal box and tap changer control box wood protection

Wood box are applied to protection HV or LV terminal box and tap changer control box or any other parts easy to get collision.

Transformer unloading at Shanghai port.

Transformer loading at Shanghai port

Tranformer loading on ship