1. General
It is outdoor type, SF6 gas insulation, single phase, inverted type, applying to highland area, wet/ dry tropical zone, with protective class, invert type, which is used for metering and relaying protection of 110kv, 50HZ or 60HZ system.
2. Standard
IEC Standard:IEC 60044-1<Current Transformer>
National Standard:
GB1208<Current Transformer>
GB311.1<Insulation co-ordination for high voltage transmission and distribution equipment>
3. Service Condition
Ambient Temperature: -30oC~+40oC
Altitude:
LVQB6-220(W1,W2,W3) less than 1000m
LVQB6-220GY(W1,W2,W3) less than 3500m
Environment Pollution Level: ii, iii, iv
4. System Condition
System Neutral Earthing Method: Effectively Earthed
5. Structure Feature
- This product is of SF6 gas insulation inverted structure. Primary winding is of penetrating type conducting rod structure; maximum short-time withstand current reaches 63KA/3s( in case of series connection of primary winding)
- Primary winding runs through the center, free of the influence of leakage flux, with measuring accuracy reaching Class 0.1 and Class 0.2S.
- The upper enclosure is processed from welded aluminum alloy, with metal bursting disc installed at the top. If spark discharge happens inside, the bursting disc will rapidly release pressure after internal pressure rises to 0.85Mpa, hence improve the product safety and prevent the danger of explosion.
- Secondary winding is cast in aluminum shielding case by use of organic materials, hence the secondary circuit will not suffer electric shock caused by insualtion breakdown. The electrode structure of optimum design improves the distribution of internal and external electric fields, achieving excellent insulating property.
- There are two types of external insulating bushings available for user choice: Fiberglass bushing with silicon rubber umnrella skirt; High-strength porcelain property.
- Seal ring, made from imported fluorine rubber, is applicable to the regoins with change in high/low temperature or rigorous ambient temperature; its annual leakage rate is less than 0.5%.
- The enclosure is processed form welded rustproof alumimum plate; the pedestal is of double-layer anticorrosion protection; stainless steel fasteners, nameplate and all other parts are guarateed to be rust-free all the time. The pedestal is equipped with density meter which can display internal gas pressure (displayed value automatically converts to internal gas pressure at 20 degree C) and send out singal when internal pressure of transformer reduces to alarm pressure, requesting gas supply.
