Product categories

Dry capacitive current transformer

No oil filled, no air filled, fireproof, explosion proof, environment friendly, maintenance free, strong pollution resistance.

Standard: IEC61869, GB20840
Rated voltage：35~220kV
Rated frequency：50Hz、60Hz
Rated primary current：25~5000A
Rated secondary current：1A、5A
Measuring winding accuracy class：0.2S, 0.2, 0.5S, 0.5, etc.
Protective winding accuracy class：5P,10P,
Installation environment: indoor or outdoor
Temperature：-40~+50℃
Altitude：1000m（conferring with consumer if above 1000m）
Pollution class： Ⅱ、Ⅲ、Ⅳ

Description

Dry capacitive current transformer

LGB dry composite capacitive current transformer is a completely independent and innovative current transformer in China. The internal insulation is a composite film capacitor, external insulation is high-temperature vulcanized silicone rubber composite sheds. The CT is a U-shaped structure, Inside the U-shaped structure is the primary current-carrying conductor. The thin film capacitor core is wound on the contactor, and the bottom is the transformer shell with built-in secondary winding. There is a measuring terminal on the bottom of the shell, which is opened for partial discharge and dielectric loss factor measurement and should be reliably grounded during normal operation.

Features:

No oil filled, no air filled, fireproof, explosion proof, environment friendly, maintenance free, strong pollution resistance.

Parameters

Standard: IEC61869, GB20840
Rated voltage：35~220kV
Rated frequency：50Hz、60Hz
Rated primary current：25~5000A
Rated secondary current：1A、5A
Measuring winding accuracy class：0.2S, 0.2, 0.5S, 0.5, etc.
Protective winding accuracy class：5P,10P,
Installation environment: indoor or outdoor
Temperature：-40~+50℃
Altitude：1000m（conferring with consumer if above 1000m）
Pollution class： Ⅱ、Ⅲ、Ⅳ

Rated insulation level and partial discharge level

Highest	Rated insulation level			Partial discharge level
voltage	Rated insulation level			Partial discharge level
Um(kV)	Power	Lightning	Operation	Partial	Partial
	Frequency	impulse	impulse	discharge	discharge(pC)
	withstand voltage	withstand	withstand	test
	(kV)	voltage	voltage	voltage
		(kV)	(kV)	(kV)
40.5	95	185	--	40.5/28	10/5
72.5	160	350	--	72.5/50	10/5
126（123）	230	550	--	126/87	10/5
145	275	650	--	145/101	10/5
252（245）	460	1050	--	252/175	10/5

Dielectric loss factor is ≤ 0.005 under 10kV and 1.05Um/√3 (ambient air temperature 10~40℃).
The highest temperature rising of winding is not greater than 75K.
Rated short-time thermal current is twenty-five times the rated current when time keeps up 1 second.