Inverted Structure with Oil-Immersed Paper Insulation of Current Transformers

Introduction:

LVB (T) series current transformer has an inverted structure with oil-immersed paper insulation (Please see the

left figure).

It is connected in series with electric energy measurement, measuring, relay protection and transient protection

functions.

Primary coil has a through-type conducting rod structure with good dynamic and thermal stability; its maximum

thermal current can be up to 63kA/3s (when primary coil is connected in series).

Primary coil passes through the center of secondary coil without flux leakage. Measurement precision can be up

to 0.1and 0.2S grades.

Secondary coil is fixed in an aluminum shielded-case by casting organic materials; secondary measurement and

protection circuits cannot be damaged by insulation breakdown.

Optimal capacitor screen bushing is made of a complete piece of imported broadsheet cable paper; it is coiled

by an automatic wrapping machine which is controlled by a computer with high performance. It has a

technological de-centrality and an excellent insulation property. Partial discharge test is carried out under power

frequency test voltage.

Use the automatic vacuum drying treatment system produced by LEYBOLD in Germany, carry out pressure-

changing vacuum drying treatment and oiling after a product is assembled completely, and all insulation

materials are imported from foreign countries. All these ensure that the dielectric dissipation factor of complete

product tan is less than 0.3%.

External insulation uses a porcelain cover with high strength, optimal surface field intensity together with lower

field intensity of internal bushing make the porcelain cover avoid explosion.

Secondary outlet box is a complete structure by casting the aluminum alloy; its sealing structure meets the

requirement of IP55, which is dust proof, water proof and air permeable; secondary terminal for wiring uses

Phoenix special terminal; it is more convenient for operations such as plug-in, pull-out and wiring etc.

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 light and handy with a small volume and light weight.

This product is free-maintenance.

Symbol Explanation

Note:1 The parameters in the table are not changeless; the Company reserves the right to change them.

2 When the parameters required by the customer are different from that in the table, they can be negotiated

according to the requirement of the customer.

3 There are several current ratios for one-time switch of the transformer.

4 We also can provide with products which meet the requirement of IEC and ANSI.

Outline and Dimensional Drawing

Our advantages:

Quality Assurance

–From the very beginning, VILLE ensures quality in every step to achieve the best quality.

 Experience Sharing

–With more than 30 years’ experience in power industry, VILLE brings you an optimized solution.

 Global Service

–Wherever you are, VILLE global network will support and provide you with value.

 Quick Response

–In response to your needs without delay, VILLE  knows the value of your time.

Thanks for choosing VILLE as your reliable partner and
please trust both of us will create a brilliant future!
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