Oil Immersed Distribution Transformer - Chinaprice: contact company for price
distribution transformers. SCE manufacture these transformers under a
licensing agreement with IEC 60076. The standard manufacturing range is
from 10 kVA to 20000 kVA with a maximum voltage of 35kV.
The core is manufactured from cold-rolled grain oriented (CRGO) silicon steel. The silicon steel is either conventional or laser treated and the choice depends on the desired loss level. The steel sheets are cut into required dimensions on automated machines thereby ensuring reduced air gap, low exciting current and low noise. Each lamination is insulated from each other to ensure a long trouble-free lifetime of the core. Suitably designed core clamping system ensures vibration free operation.
The windings are made of high-grade electrolytic cooper and are concentrically positioned. Usually copper foil is used for the low voltage windings. Round shaped, enamel insulated wire is used for the high voltage windings. It is exclusively of layered construction and is wound directly onto the low voltage winding, giving a maximum mechanical strength, rigidity and compactness.
The tap changer is fixed on the high voltage winding for voltage regulation.
Off-load tap changer.
It is basically a 3, 5 positions switch, which helps to adjust the voltage at a desired level. The tap changer handle is either on the top cover or sidewall and acts directly on the switching mechanism. As the name indicates, the off-load tap changer must only be operated when the transformer is de-energized.
On-load tap changer.
For higher ratings power transformer, it is basically 7, 9, 11, 17 positions switch which can be operated with energized. Brand of MR, ABB or Huaming are our options for on-load tap changer.
The tank is of hermetically sealed design and is made from corrugated steel sheets. This type of construction allows a degree of flexibility that is needed to accommodate the expansion and contraction of oil due to varying service conditions. The tank cover is bolted to the body of the tank. The surface is shot blasted first to eliminate all signs of rust, welding spatters, greese, oil and mill scale to achieve a good abrasive surface for the paint to hold for a long period of time. The two coats of primer paint are applied followed by one coat of standard “Cement Gray” (RAL 7033). (Colour Code can be customized）
Several types can be provided depending on the requirement and applications. Porcelain bushings are used on the HV side as a norm while on the LV side porcelain or polyamide bushings are provided.
Other designs are also available on request.
The regular accessories would include:
Oil conservator（available on request, usually used for ratings above 2000kVA）
Pressure release valve
Oil level indicator
Oil drain valve
Oil sample valve
Cable box (available on request)
All the manufactured units undergo the following tests in the factory as described in IEC-60076.
Transformer ratio and connection
Measurement of load losses and short circuit impedance.
Measurement of no-load losses.
Separate source withstand voltage test
Induced over-voltage test
On-load tap changer test (only for on-load power transformer)
Transformer oil test
Sealing test of tank
Temperature rise test
Lighting impulse withstand voltage test
Measurement of partial discharge
- Posted By: South China Electric(Xiamen) Co.,Ltd
- Phone: 865926295719
- Address: No.47,Huanzhu Road,Jimei North Industrial Zone, Xiamen, China
Published date: June 19, 2013 -
- Business Description: South China Electric Development Limited, a wholly foreign owned enterprise of South China Group, established in 1992 with a registered capital of HKD 220 million, is engaged in manufacturing of power equipments including transformers, switchgears, compact substations and circuit breakers etc. So far, it has acquired ISO9001, ISO14001 and OHSAS18001 certificates, and was awarded as China Famous Brand, also is the authorized partner of ABB, GE and Siemens.
Boasting high quality talents and powerful scientific research and development capacity, South China Electric Development Limited continuously launches energy saving, low noise, and environment friendly new power products. In addition to the constant products innovation, the company invests huge amount of fund in technology introducing and improvement. It introduced Hedrich fully automatic vacuum casting equipment from Germany and the up to date equipments of metal processing system from Japan Murata; upgraded the critical equipments including GEORG transformer lamination cutting line, foil winder, micro processor monitoring system for transformer test, partial discharge, noise level tester, coating and painting assembly line. Our transformers has passed the type test by the State Transformer Quality Control and Examination Center (CTQC), the medium voltage switchgear has passed the type test by the State High Voltage Apparatus Quality Supervision and Examination Center, the low voltage complete set of equipment has passed the China Compulsory Certification and the vacuum cast resin transformer has got KEMA certification of Netherland.
The core competitive advantage of South China Electric Development Limited lies in its constant pursuit of technology innovation, better quality and its human oriented corporate culture. Presently, South China Electric Development Limited is rapidly stepping forward to be collectivized.
South China Electric Development Limited, targeted for distributing green energy for better world, will constantly enhance itself and persistently innovate.
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