220KV Current Transformer
Place of Origin : Liaoning, China (Mainland)
Brand Name : DLBF
Usage : Metering and Relay Protection
Phase : Single
Coil Structure : Winding Type
Installation Method : Outdoor
Highest Voltage : 252kv
Rated Voltage : 220kv
It is Outdoor, Oil-immersed type ,used for metering and relay protection, with protective class, hair-pin type, applying to highland area, wet/dry tropical zone, which is used for metering and relay protection of 220kv, 50HZ or 60HZ system.
IEC Standard: IEC 60044-1<Current Transformer>
GB311.1<Insulation co-ordination for high voltage transmission and distribution equipment>
3. Service Condition
LB7-220(W1,W2,W3) less than 1000m
LB7-220GY(W1,W2,W3) less than 3500m
Environment Pollution Level: ii, iii, iv
4. System Condition
System Rated Voltage:220kv
System Highest Voltage:252kv
System Rated Frequency: 50HZ or 60HZ
System Neutral Earthing Method: Effectively Earthed
5. Structure Feature
- It is oil/paper insulation system, the primary insulation is wound from high voltage cable paper, and is placed several capacitor screen of voltage division in the primary insulation, which can improve electric field distributing and decrease the consumption of insulation material. It will be immersed with transformer oil after desiccating under vacuum. It has advantages of stable and reliable performance of insulation, rich successful experience, a long life time and convenient maintenance.
- Perfect fluidity performance of transformer oil is good for heat dissipation, it also has self recover ability for the failure of partial discharge caused by air bubble and dust.
- The current ratio can be changed easily by change the connection method of connecting plate on oil conservator to series or parallel connection
- Hermetically sealed stainless steel metallic bellows is installed on the top, which protect the transformer oil from moisture and extend the life time, also there is a oil level gauge on the bellows for observing the changing of oil volume.
- There is a multi function oil drain valve on the base, which make it more convenient for sampling, draining and refilling
- The primary terminal and secondary terminal board are made of epoxy casting, the seal performance is more reliable
- There is a individual terminal of earth screen on the tank
- The oil conservator and base etc use DACRAL(Zinc/Chromate coatings) for resistance to corrosion, which gives a high degree of corrosion resistance
- The primary over-voltage protection device and secondary open circuit over-voltage protection device can be provided according to the requirements of user.
Dalian North Instrument Transformer Group Co., Ltd. was established in the end of the year 1997. Our company covers a land area of 400,000 square meters, and a building area of 120,000 square meters, located in Fengrong Industrial Park, Pulandian, Dalian, P.R. China. NORIT Group is constituted by one Parent Company-Dalian North Instrument Transformer Group Co., Ltd. (NORIT) and two subsidiary companies: Dalian North Vacuum Switch Co., Ltd. and Dalian North Arrester Co., Ltd. Now the Group has more than 1400 employees including 296 technicians and 45 experienced senior engineers.
NORIT Group mainly independently develops and manufactures 0.22-35KV dry type instrument transformers, 35-500KV oil-insulated and gas-insulated Instrument transformers, 10-40.5 vacuum switches and 220KV below classes of composite insulation arresters. Our products sell well all over the country and sales occupy 15% of the national market. NORIT Group's products have been widely used in the Three Gorges Project, Qinghai-Tibet Railway, and Olympic Venus and Electrified Railways. Parts of our products are also exported to many countries and regions in Africa, Asia, the Middle East, and South America. Presently NORIT Group owns 580 sets of advanced production equipment and 168 sets of precise test instrument to meet the requirements of mass production and ex-factory full inspection.
NORIT Group has acquired different honorary titles of more than 50 items. In the year 2005-2007, NORIT was one of the China Top Three Instrument Transformer Enterprise during 3 year. In March 2008, our brand DLBF and figure were classified as "Chinese Famous Trademark" by National Administration Bureau of Industry and Commerce.
NORIT Group holds enterprise spirit of "Personal character determines product quality" and business philosophy of "Produce the best product & serve the whole world". We are sincerely looking forward to co-operating with worldwide friends, to create a glorious future!