1. General

applying to highland area, wet/dry tropical zone, reinforced insulation, with protective class, dry type, current transformer

It is outdoor, single phase and organic insulation dry-type current transformer, which is used for metering and relay protection of 35kv, 50 or 60 HZ system.

2. Standards

IEC standard: IEC 60044-1<Current Transformer>

National Standard:

GB1208<Current Transformer>

GB311.1<Insulaiton co-ordination for high voltage transmission and distribution equipment>

3. Service Condition

Ambient Temperature: -40^oC~+40^oC

Altitude: less than 1000m(above 1000m, technical conditions should be separatedly negotiated by both sides)

4. System Conditions

System Neutral Earthing Method: non-effectively earthed

5. Structure Feature

• It is organic insulation type product. The external insualtion is silicone rubber petticoat.
• Electric field evnely distributed, partial discharge small amount and stable, small dielectric loss.
• The current ratio can be changed easily by changing the connection method in shielding enclosure to facilitate the realization to series or parallel connection.
• The grading cover which is aluminum alloy casting formed and the cabinet which is stainless steel plate drawing formed, use DACRAL(Zinc/Chromate coatings) for resistance to corrosion, which gives a high degree of corrosion resistance.
• All parts, such as stainless bolts, nameplate are rust-free all the time.
• The product has no oil, no ceramic, no gas.
• Barely need for maintenance. Just need to measure once capacitance and dielectric loss factor every 2~3 years.

Dalian North Instrument Transformer Group Co., Ltd.

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