LB type 50Hz/60Hz IEC/IEEE Standard Current Transformer

LB type current transformer has an oil-immersed fully-sealed structure. The primary coil is U-shape, the main body is fixed on the bracket, the main insulation uses capacitor type oil-paper, use the high voltage cable paper to wrap the core of primary coil, and set up several capacitor shields among it, the internal shield is connected to high potential, and the external shield is connected to ground reliably.

There is a porcelain bushing at the upper part of oil tank, and an oil conservator is set up on top of porcelain bushing, primary outlet terminal is on the oil conservator, series-parallel connection uses an external switch device, i.e., the switching operation is carried out outside the oil conservator.

Use a stainless steel expander as the oil compensation device to ensure oil quality. Oil level is indicated by the pointer at the upper window of expander.

A nameplate is set up on the oil tank to show the technical data. There are four lifting lugs for hoisting, an oil-discharge valve and earthing bolts at the bottom of oil tank.

The product can have four to six secondary coils, the secondary measurement coil is made by microcrystalline alloy with high magnetic conductivity, thus can ensure that the measurement precision reaches up to 0.2 grade or 0.2S grade. current transformer has a pigtail at measurement secondary coil, in order to get two current ratios.

Use new technology and new materials such as hot galvanizing or stainless steel standard parts etc for outside of the product to make complete equipment rustless.

Reasonable and originative structure as well as advanced technology ensures that the product runs reliably, safely and durably.

Hunan Electric Union Corp. is a joint-stock enterprises established by Hua Xiang Xiang Neng Electric Power Co. Ltd., Huaxiang Power Transformer Co. Ltd., Hunan Xiang Neng Electric Power Automation Co., Ltd, and Hunan High Voltage Switchgear Co., Ltd . It is located in the China national high-tech Industrial Development Zone, ChangSha City, Hunan Province, and has two main manufacturing parks: Hua Xiang Xiang Neng in Yiyang City and Hunan High Voltage Switchgear in Changsha City.

In Yiyang, it covers 96,000 square meters, including building area 58,000 square meters, and also there are living area, office area, recreational area, a fully equipped facilities in the region. The leading products are 220KV class and below power transformer, 40.5kV and below high/low voltage switchgear. 40.5kV high and low voltage prefabricated substation, 12kV to 40.5kV cable branch box, outdoor switchgear station and so on.
In Changsha, It covers 220 acre of land. In 2009, It is invested 300 million RMB to construct the new-type and high precision electric transformation and transmission equipments' R&D Institute and manufacture factory. it mainly produce 72.5kV to 252kV GIS, 12kV to 252kV circuit breaker, 1100kV and below disconnector.

Hua Xiang Xiang Neng Electric Power Co. Ltd. has won the "brand-name products in Hunan province", "Hunan province's quality and credit grade AAA enterprise", "Hunan province Trustworthy Enterprises "," National quality inspection steady qualified product" and many other awards.
The company strict follows national standardized quality management system in the production process, and passed the ISO9001: 2008 quality system certification, ISO14001 environmental certification and GB/T 28001-2001 occupation health and safety management system certification, product standards are equivalent to the IEC standard. Company's standard management insures product quality and safe, truly provide customers with excellent quality products and services.


Hunan High Voltage Switchgear Co., Ltd is a large scale enterprise of developing and manufacturing the high voltage electric equipments. Established in 1950s, It has awarded as follows: The China electric Equipment Industrial Association Governing Units, The qualified supplier of State Grid and Southern Grid, the key-high tech enterprise of national torch plan and high tech enterprise of Hunan province. It has already passed the ISO9001, 2008 and PCCC quality system certification.
Over the fifty years, It has been adhered to the quality policy of All For The Customer and won the trust by the high quality products and perfect service.
All For Customer is the technology, quality and management. We aims to create the world first-class brand and become the largest professional electric equipment manufacturer in Asia.
We convinced that It can keep the pace with the times and attract the attention from the world.