CN201549358U

CN201549358U - High-capacity voltage transformer capable of reducing local electric discharge

Info

Publication number: CN201549358U
Application number: CN2009202204046U
Authority: CN
Inventors: 隋广君; 柳全仁; 隋国成; 尹丽丽
Original assignee: Dalian Zhongguang Instrument Transformer Co Ltd
Current assignee: Dalian Zhongguang Instrument Transformer Co Ltd
Priority date: 2009-10-28
Filing date: 2009-10-28
Publication date: 2010-08-11
Anticipated expiration: 2019-10-28

Abstract

The utility model discloses a high-capacity voltage transformer capable of reducing local electric discharge, which comprises a primary coil, a secondary coil, an iron core, a shielding layer, electrostatic shields, a pouring body and a wiring terminal. The electrostatic shields are arranged at two ends of the iron core, the shielding layer is lapped on a half of the outer side of the iron core, the primary coil and the secondary coil are both wound on the iron core and are in coupling connection through the iron core, the primary coil, the secondary coil and the iron core are all poured inside epoxy oxygen resin to form the closed pouring body, and leads of the primary coil and the secondary coil are respectively electrically connected with terminals of the wiring terminal. The electrostatic shields are disposed at two ends of the voltage transformer, and the shielding layer is arranged on the half of the outer side of the iron core, thereby effectively shielding medium easy to discharge out of an electric field, such as burrs at the tip of the iron core, effectively reducing local discharge quantity of the formed voltage transformer, and increasing safety and stability of the voltage transformer.

Description

Reduce the big capacity voltage transformer of partial discharge

Technical field

The utility model relates to the electrical installation that uses in the transmission line, particularly relates to a kind of big capacity voltage transformer that reduces partial discharge.

Background technology

Voltage transformer generally is used in the power network line, as the equipment of voltage measurement and protection.Existing voltage transformer generally is made of primary winding, secondary coil, iron core and insulation; first and second coil is coupled by iron core; primary winding is connected with the high-pressure side; secondary coil is connected with measuring instrument or relay protection device, realizes that high pressure is converted into the low pressure that can be convenient for measuring or is used to drive the low pressure of relay protection device by iron core coupling.The iron core of present voltage transformer adopts cold-reduced silicon sheet to reel and forms, be divided into Pyatyi, and in iron core, be not provided with the electrostatic screen device, therefore cause the big problem of partial discharge quantity, and many most advanced and sophisticated burrs are often arranged on the iron core surface, these most advanced and sophisticated burrs can produce point discharge during use, have also increased the partial discharge quantity of product, cause present voltage transformer Product Safety, less stable.

The utility model content

Based on above-mentioned existing in prior technology problem, the utility model embodiment provides a kind of big capacity voltage transformer that reduces partial discharge, and its partial discharge quantity is little, can improve security of products and stability.

The utility model is achieved through the following technical solutions:

The utility model embodiment provides a kind of big capacity voltage transformer that reduces partial discharge, comprising:

Primary winding, secondary coil, iron core, screen, electrostatic shielding, pour mass and binding post;

Described iron core two ends are provided with electrostatic shielding, iron core outside half lap one deck screen, first and second coil all is wrapped on the iron core, first and second coil is of coupled connections by iron core, first and second coil and iron core all are cast in and form closed pour mass in the epoxy resin, and the lead-in wire of first and second coil is electrically connected with each terminal of binding post respectively.

By above-mentioned embodiment of the present utility model as can be seen, in the utility model embodiment, electrostatic shielding is set by two ends at voltage transformer, and at iron core outside half lap one deck screen, thereby effectively with the most advanced and sophisticated burr of iron core etc. easily the dielectric shielding of discharge outside electric field, thereby effectively reduce the partial discharge quantity of the voltage transformer product of formation.Voltage transformer security of products and stability have been increased.

Description of drawings

The structural representation of the voltage transformer that Fig. 1 provides for the utility model embodiment;

The structural representation of the iron core of the voltage transformer that Fig. 2 provides for the utility model embodiment;

The application electrical schematic diagram of the voltage transformer that Fig. 3 provides for the utility model embodiment.

Each label is among the figure:

1. top electrostatic shielding; 2. terminal electrostatic shielding; 3. primary winding; 4. secondary coil; 5. screen; 6. pour mass; 7. primary connection terminal; 8. iron core.

Embodiment

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

Embodiment

Present embodiment provides a kind of big capacity voltage transformer that reduces partial discharge, and the equipment that can be used in the power circuit as voltage measurement and relaying protection uses, and as shown in Figure 1, this voltage transformer comprises:

Primary winding 3, secondary coil 4, iron core 8, screen 5, electrostatic shielding (top electrostatic shielding 1 and terminal electrostatic shielding 2) pour mass 6 and binding post 7;

Described iron core 8 two ends are provided with electrostatic shielding, promptly top electrostatic shielding 1 and terminal electrostatic shielding 2 are set at iron core 8 two ends, iron core 8 outside half lap one deck screens 5, promptly at the outside of iron core 8 half lap one deck semiconductive crimped paper, first and

second coil

3 and 4 all is wrapped on the iron core, first and

second coil

3,4 is of coupled connections by iron core 8, first and

second coil

3,4 and iron core 8 all are cast in and form closed pour mass in the epoxy resin, and the lead-in wire of first and

second coil

3,4 is electrically connected with each terminal of binding post 7 respectively.

In the voltage transformer, the amount of capacity of effective sectional area of iron core and voltage transformer has direct relation, the iron core that present existing most voltage transformer products use generally is divided into 3 grades or 4 grades, exist segment space to slattern, cause not increasing under the prerequisite of volume, the capacity of voltage transformer can't improve.The structure of the iron core of the voltage transformer among the utility model embodiment as shown in Figure 2, the iron core of the loop configuration form for being reeled by cold-reduced silicon sheet is divided into 5 grades.The sheet of described iron core is wide to be 30～75mm; The sheet of iron core is thick to be 29～74mm, the iron core of this structure is through after reasonably selecting the wide and sheet of lamination thick, make the effective cross-section of iron core more approach circle, increased the net sectional area of iron core, make it possible to the voltage transformer product and under identical overall dimensions, can accomplish bigger capacity.

The wiring schematic diagram of voltage transformer in application that Fig. 3 provides for the utility model embodiment, general three voltage transformers are measured three-phase line A, B, C after using simultaneously and being electrically connected.

In sum, voltage transformer among the utility model embodiment, by the iron core two ends top electrostatic shielding 1 and terminal electrostatic shielding 2 are set, and under the effect of outside half lap one deck as the semiconductive crimped paper of screen of iron core, can be effectively with the most advanced and sophisticated burr of iron core etc. easily the dielectric shielding of discharge outside electric field, reduce the partial discharge quantity of voltage transformer product effectively, thereby improved voltage transformer security of products and stability.

The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claims.

Claims

1. a big capacity voltage transformer that reduces partial discharge is characterized in that, comprising:

2. the big capacity voltage transformer that reduces partial discharge as claimed in claim 1 is characterized in that, the annular core of described iron core for being wound into by cold-reduced silicon sheet.

3. the big capacity voltage transformer that reduces partial discharge as claimed in claim 2 is characterized in that the sheet of described iron core is wide to be 30～75mm, and the sheet of iron core is thick to be 29～74mm.

4. the big capacity voltage transformer that reduces partial discharge as claimed in claim 1 is characterized in that, described screen adopts semiconductive crimped paper.