CN2126934Y

CN2126934Y - Current mutual-inductor

Info

Publication number: CN2126934Y
Application number: CN 92218268
Authority: CN
Inventors: 董澄裕
Original assignee: SUZHOU MUTUAL-INDUCTOR FACTORY
Current assignee: SUZHOU MUTUAL-INDUCTOR FACTORY
Priority date: 1992-07-02
Filing date: 1992-07-02
Publication date: 1993-02-10
Anticipated expiration: 2002-07-02

Abstract

The utility model relates to a current mutual-inductor used for measuring the current and power of high voltage circuits or used for relay protection circuits, comprising a primary coil, a secondary coil and an iron core. The primary coil is a ring copper rod penetrated through the inner hole of the annular iron core, the iron core is an annular belt of silicon steel sheets, the secondary coil is winded on the annular iron core, and the entire device is sealed by epoxy resin. The utility model is characterized in that the short edge of the rectangular section of the ring copper rod used as the primary coil is perpendicular to the ring plane, the outer surface of the copper rod is provided with a powder layer of the epoxy resin, and the outer ring of the annular iron core is added with a copper protection ring. The utility model enlarges the creepage distance, enhances the insulation performance and enhances the measuring precision and reliability.

Description

Current mutual-inductor

The utility model relates to a kind of current transformer that is used to measure high-tension line electric current and power or is used for relay protection circuit.

Before the utility model is made, existing current transformer is to be made of primary winding, secondary coil and iron core, primary winding adopts a copper bar along the long side direction of its square-section reel (flat around), the long limit of square-section that is the annular copper bar is perpendicular to planar annular, and pass from the endoporus of annular iron core, iron core is made annular with the silicon steel sheet roll coil of strip, and secondary coil is on the annular iron core.This current transformer can be used in electric current and the power of measuring high-tension line or is used for relay protection circuit.But the creepage distance of this current transformer is little, damages insulation easily, influences certainty of measurement and reliability.

The purpose of this utility model provides the current transformer that a kind of creepage distance is big, reliability is high.

The current transformer that the utility model proposes is to be made of primary winding, secondary coil and iron core, primary winding is an annular copper bar and passes from the endoporus of annular iron core, iron core is made annular with the silicon steel sheet roll coil of strip, secondary coil is on the annular iron core, whole device epoxy encapsulation, it is characterized in that minor face as the square-section of the annular copper bar of primary winding perpendicular to planar annular, and the copper rod outer surface there is the epoxy powder layer; The outer ring of annular iron core installs the copper guard ring additional.

The current transformer that the utility model proposes is rational in infrastructure, and is safe and reliable.Copper bar as primary winding adopts upright winding method to reel, and has improved the dynamic stability and the thermal stability of current transformer; Copper rod outer surface spray epoxy powder can weaken thermal expansion, the protection primary winding; The outer ring of annular iron core installs the copper guard ring additional can prevent that the epoxy resin that encapsulates is because of shrinking the stress influence that produces.In a word, increased creepage separation, improved insulation property, satisfied product the electric Field Optimization designing requirement through above-mentioned improved current transformer.

Followingly concrete enforcement of the present utility model is further described with reference to accompanying drawing, shown in Figure 1 is the structure chart of current transformer, shown in Figure 2 is the part drawing of primary winding copper bar, and shown in Figure 3 is the end view of copper bar, and shown in Figure 4 is the part drawing of secondary coil iron core.This current transformer is by primary winding (1), secondary coil (2) and (3) unshakable in one's determination constitute, primary winding (1) adopts a copper bar to reel and makes, and pass from the endoporus of annular iron core (3), (3) unshakable in one's determination make annular with the silicon steel sheet roll coil of strip, secondary coil (2) is on annular iron core (3), whole device epoxy encapsulation, it is characterized in that copper bar as primary winding (1) along its square-section minor face (BC limit) direction of (the rectangle ABCD among Fig. 3) reel (upright around), the minor face of square-section that is the annular copper bar is perpendicular to belt plane, and copper bar (1) outer surface spray epoxy powder; The outer ring of annular iron core (3) installs copper guard ring (4) (referring to Fig. 4) additional, and the thickness of copper ring (4) is 1～5 millimeter.According to instructions for use, select primary winding, secondary coil and the iron core of different size for use, this current transformer can be made series of products.

Claims

A kind of current transformer that is used to measure high-tension line electric current and power or is used for relay protection circuit, it is to be made of primary winding, secondary coil and iron core, primary winding is an annular copper bar, and pass from the endoporus of annular iron core, iron core is an annular silicon steel sheet band, secondary coil is on the annular iron core, whole device epoxy encapsulation, it is characterized in that minor face as the square-section of the annular copper bar of primary winding perpendicular to planar annular, and the copper rod outer surface there is the epoxy powder layer; The outer ring of annular iron core installs the copper guard ring additional.