CN2706845Y - Current transformer - Google Patents

Abstract

The utility model provides a current mutual inductor which is composed of an iron core 6, a primary coil 4, a secondary coil 5, insulative material 3, a primary lead wire 1 and a high voltage lead wire insulating bush 2. The secondary coil 5 of the utility model is directly winded on the iron core 6. The primary coil 4 is hung on the secondary coil 5. The iron core and the coil are cast with the insulative material by a fully enclosed mode. The performance of the magnitude of partial discharge (key technology index) is improved. The surface of the casting body adopts an umbrella skirt shaped structure, which can increase the corresponding specific creepage distance. The high voltage lead wire insulating bush 2 is made of insulated material with high compressive strength and good flexibility, which can avoid the break of the primary high voltage lead wire during the mounted process for the product. The disability rate of the completed product is decreased.

Description

Current transformer

Affiliated technical field

The utility model relates to the pouring current transformer that a kind of combination transformer is used, the insulating coating of a high-voltage connection adopts insulation, compressive resistance height and the good material of pliability, iron core and coil carry out totally-enclosed cast with insulating material and form, and have improved partial discharge quantity (key technical index) performance.

Background technology

At present, employed current transformer all is to adopt half casting insulated structure in the similar combination transformer: what iron core adopted is common lamination, be exposed to the pour mass outside, cause product in use iron core very easily make moist, cause its partial discharge quantity excessive; Mostly the profile of pour mass is to adopt cylindrical shape, creepage more too small than distance; Mostly the exterior insulation of high-voltage connection end is to adopt epoxy resin directly to pour into a mould, and is easy to rupture in the process of installing and causes a large amount of waste products.

Summary of the invention

In order to overcome the shortcoming of existing similar current transformer (the above).The current transformer that a kind of combination transformer that the utility model provides is used, not only improved partial discharge quantity, and iron core and coil all adopt the totally-enclosed castable of insulating material, also adopted insulation, compressive resistance height and the good material of pliability to make the insulating coating of high-voltage connection simultaneously.

The technical scheme that its technical problem that solves the utility model adopts is: core structure adopts annular core, secondary coil is directly on iron core, primary winding is sleeved on the secondary coil outside turns to the suspension ring type, then iron core and coil are all adopted the epoxy resin mixed glue castable.The structure of full skirt shape is adopted on the pour mass surface, to increase its corresponding creepage distance that compares.On the insulation measures of high-voltage connection end, adopt be the good four fluorine tube of insulation, compressive resistance height and pliability as its insulating coating, avoided product in the process of installing because wire breaking, and scrapping of causing or damage improved the qualification rate of product.

The beneficial effects of the utility model are, have not only improved the partial discharge quantity performance of product, have increased that it is corresponding creepage than distance, and have avoided product a high-voltage connection fracture to occur in installation process, have reduced the scrappage of finished product.

Description of drawings

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is a front view of the present utility model

Fig. 2 is an end view of the present utility model

As shown in Figure 1 and Figure 2, primary winding 4 is sleeved on secondary coil 5 and the iron core 6 and (forms the suspension ring type), what iron core 6 adopted is loop configuration, once goes between 1 directly to be welded on the leading-out terminal of primary winding 4 and at its table and to adopt the good four fluorine tube of insulation, compressive resistance height and pliability as its insulating coating 2.All adopt epoxy resin mixed glue 3 to water into fully closed pour mass at primary winding 4 and secondary coil 5 and iron core 6 and carry out insulation protection.

Claims (3)

1. a current transformer comprises: by annular core (6), primary winding (4), secondary coil (5), insulating material (3), once lead-in wire (1) and high-voltage connection insulating case (2) are formed, it is characterized in that: annular core (6) is in secondary coil (5) inside, and primary winding (4) becomes the suspension ring shape with secondary coil (5); Annular core (6), primary winding (4) and secondary coil (5) are insulated material (3) and wrap up fully, form full-closed structure.

2. a current transformer as claimed in claim 1 is characterized in that: the insulating case (2) of high-voltage connection (1) adopts insulation, compressive resistance height and the good material of pliability.

3. a current transformer as claimed in claim 1 is characterized in that: the surface of pour mass becomes full skirt shape structure.

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