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66kV SF6 Gas Inductive Current Transformer

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66kV SF6 Gas Inductive Current Transformer

LVQB-72.5W3

Category

SF6 gas CT

Keyword:

Live tank

Oil immersed

SF6

Current transformer

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66kV SF6 Gas Inductive Current Transformer

Product description

Scope

◆It is outdoor, single phase and SF6 insulated top-head type current transformer, which is used for metering and relay protection of 33~230kV, 50 or 60Hz system.

Standards

◆IEC 61869-1; IEC 61869-2

Service conditions

◆Ambient temperature: -40~+45℃

◆Altitude: ≤1000m (If above 1000m,the product will be customized according to user’s request)

◆Pollution level: II, III, IV

Design features

◆It is SF6 gas insulated live tank structure. Primary winding is penetrating type conducting rod structure, maximum short-time withstand current can reach 63kA/3s (in case of series connection of primary winding)

◆The upper enclosure is processed by 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 shield through organic materials, hence secondary circuit won’t suffer electric shock caused by insulation breakdown. The electrode structure of optimum design improves the distribution of internal and external electric field, achieving excellent insulating property.

◆Optimized designs for external insulation make inner and external electric field distribute evenly without discharge. Two type insulators are offered for user.

1. Composite insulator

2. High strength porcelain insulator

◆Density meter is mounted on the base which can show the transformer internal gas pressure (display value automatically converted to internal gas pressure at 20 ℃) and density, when transformer internal pressure drops down to alarm level, gas should be replenished.

◆Sealing ring adopts special material for SF6 gas which is applicable to a area with large temperature difference and harsh environment , annual leakage rate is less than 0.5%.

◆There is a multi function oil drain valve on the base, which makes it more convenient for sampling, draining and refilling.

◆All adopted insulation parts are environmental protection material.

◆The base uses spray painting or hot galvanizing, which gives a high degree of corrosion resistance.