LB7-220 Outdoor oil-immersed type 220kV current transformer

1,stable, reliable performance of insulation, rich successful experience 2, low loss, low noise 3, 220kV current transformer

LB7-220 Outdoor oil-immersed type 220kV current transformer

It is oil insulation system, the primary insulation is would from high voltage cable paper, and is placed several capacitor screen of voltage division in the primary insulation, which can improve electric field distributing and decrease the consumption of insulation material. It will be immersed with transformer oil after desiccating under vacuum. It has advantage of stable and reliable performance of insulation, rich successful experience, a long life time and convenient maintenance.

Perfect fluidity performance of transformer oil is good for heat dissipation, it also has self recover ability for the failure of partial discharge caused by air bubble and dust.

The current ratio can be changed easily by change the connection method of connecting plate on series or parallel connection.

Hermetically sealed stainless steel metallic bellows is stalled on the top, which protects the transformer oil from moisture and extend the life time, also there is a oil level gauge on the bellows for observing the changing of oil volume.

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

Technical data

Rated primary voltage	220kv
Highest voltage for equipment	252kv
Rated frequency	50 or 60 Hz
Rated current ratio	2×300-2×1000/5or 1A
Number of secondary windings	1-8
Accuracy of measuring winding	0.2, 0.2s, 0.5, 0.5s
Accuracy of production winding	5p or 10p
Rated secondary output	20-50VA
Accuracy limit factor	15, 20, 25, 30
Instrument security factor	≤5 or 10
Partial discharge under 1.2Um/√3Kv	≤5Pc
Dielectric dissipation factor tg under 10KV-Um/3Kv	≤0.005
Power frequency withstand voltage on primary windings	395kv rms
Rated lightning impulse withstand voltage	950kv peak
Power frequency withstand voltage between primary sections	3kv rms
Power frequency withstand voltage on earth screen to earth	5kv rms
Power frequency withstand voltage on secondary windings and secondary windings to earth	3kv rms
secondary winding inter-turn withstand voltage	4.5kv peak
Mechanical strength(three direction)	2500N

LB7-220 Outdoor oil-immersed type 220kV current transformer