36-550kV Oil immersed current transformer, Live tank type（Top core type）

Oil-immersed current transformers is applied for metering and protect in 36~550kV High-voltage power transmission system.Oil paper insulated.

Oil-immersed current transformers is applied for metering and protect in 36~550kV High-voltage power transmission system.Oil paper insulated.

Current transformer LVB-product range is based on top core design. It is an oil-paper insulated type with a metallic expansion bellow, Connection between components uses argon-arc welding, fill in high pressure nitrogen to detect leakage after assembly is complete, so oil penetration and oil leakage caused by oil-immersed products are resolved at root. Use an aluminum alloy cast case, all components including the base, connection box, stainless steel expander, and nameplate etc do not rust forever. It is outdoor, single phase, and oil-immersed to-head type, which is used for metering and relay protection, 50 or 60Hz system. It is a reliable product with minimum maintenance and suitable for wide range of environmental conditions.

This product is light and handy with a small volume and light weight and meets the requirement of horizontal transportation.

Main Technical parameters 

• Standards: IEC61869-2, ANSI(IEEE)C57.13, AS,BS and etc

• Highest system voltage: 36~550kV

• Rated power frequency: 50Hzor60 Hz

• Polarity：Negative

• Rated primary current: Up to 8000A

• Rated secondary current: 1A or 5A

• Primary continuous current: 1.2~2.0Uncontinuous

• No. of the secondary windings: 1~8

• Accuracy class of the windings for measurement:

   IEC CL0.15, 0.2S, 0.2, 0.5S, 0.5, 1,

   ANSI 0.15S, 0.15

• Accuracy class of the windings for protect: 5P, 10P, 5PR, 10PR,PS, C400,C800,TPY, TPS, TPX, TPZ, PX

• Rated output: 5~200VA,others on request

• Security factor of the instrument (Fs):5, 10

• Short-time thermal current and dynamic stable current:

   36~72.5kV :Ith=31.5kA( 3s); Idyn=80kA (peak)

   123~765kV: Ith=40-63kA (3s); Idyn=100~160kA (peak)

• Partial discharge:≤5pC under the voltage 1.2Um/√3

• The dielectric loss factor:≤0.005 (10kV and um/√3)

•Temperature rise limit: ≤60K

• Ambient temperature:-50~+50°C

• Altitude: Standard design is less than 2000mOr highervalues onrequest

• Creepage distance ratio:25 or 31(mm/kV)

• Earthquake standard design: up to 0.5g

• Accuracy limit coefficient：5, 10，15，20，25，30，40

• Accuracy limit conditions of the TPY class:

   a. Symmetrical multiple of the short time current Kssc=20 or 25

   b. Time constant of primary windings Tp: 100ms

   c. Direct Current Amount of short circuit current 100% (full migration)

   d. Stipulated operating cycle 

       C-0.1S-O-0.5S-C-0.1S-O or C-0.1S-O-0.4S-C-0.1S-O

   e. The guaranteed transient error time during reclosing：40ms or 50ms

   f. Remanence coefficient≤0.1 

550kV 525kV 420kV 362kV 300kV 245kV 170kV 145kV 123kV 72.5kV 52kV 36kV 24kV Oil immersed current transformer, Oil CT