CN202495330U

CN202495330U - Reliable grounding structure of secondary winding of voltage transformer

Info

Publication number: CN202495330U
Application number: CN2012200324083U
Authority: CN
Inventors: 贾建华; 刘松; 郭锋; 王雨凡; 王丰
Original assignee: Dalian No1 Instrument Transformer Co Ltd
Current assignee: Dalian No1 Instrument Transformer Co Ltd
Priority date: 2012-02-02
Filing date: 2012-02-02
Publication date: 2012-10-17
Anticipated expiration: 2022-02-02

Abstract

The utility model discloses a reliable grounding structure of a secondary winding of a voltage transformer. The reliable grounding structure comprises a terminal box, copper lug plates, a metal baseplate, grounding screws and a body; the terminal box and the body are integrally molded; the body and the terminal box are arranged on the metal baseplate; the tail ends of a primary winding and a secondary winding are led out through the copper lug plates to be cast in the terminal box; circular holes are arranged on the copper lug plates, the terminal box is correspondingly provided with long through holes, and screwed holes are correspondingly arranged on the metal baseplate; and after the grounding screws are sequentially penetrated through the circular holes and the long through holes, the grounding screws are screwed into the screwed holes of the metal baseplate, simultaneously the grounding screws are pressed and connected on the copper lug plates and are communicated with the metal baseplate, the copper lug plates are respectively connected with wiring terminals at the tail ends of the primary winding and the secondary winding, and the metal baseplate is grounded. The reliable grounding structure can enable wire leading-out terminals at the tail ends of the primary winding and the secondary winding to be reliably grounded so as to increase the safety of the voltage transformer.

Description

A kind of voltage transformer secondary winding reliable ground structure

Technical field

The utility model relates to a kind of ground structure of voltage transformer, refers in particular to a kind of voltage transformer secondary winding reliable ground structure.

Background technology

In the prior art, like Fig. 1 and shown in Figure 2, three single-phase earthing voltage transformers are formed the Y-Y wiring, and the voltage transformer of prior art generally comprises body 60, terminal box 70 and metal base plate 50; Body 60 is installed on the metal base plate 50 with terminal box 70, and terminal box 70 electrically connects terminal box 70 and body 60 one poured with epoxy resin moulding with body 60; Terminal box 70 is provided with a winding end (N) binding post 10 and the terminal binding post 30 of secondary winding; The terminal binding post 10 of its winding and terminal (n) binding post 30 of secondary winding are drawn ground connection connecting line (20,40) usually respectively; Then ground connection connecting line (20,40) is installed the switch cubicle terminal board ground connection of voltage transformer at metal base plate 50 earth stud place (not shown)s or warp; Its earth point requires reliable, must not multipoint earthing.

Because 30 distances of terminal (n) binding post of secondary winding are less; Use multiple conducting wires might cause the top line and the terminal line short circuit of secondary winding; Thereby the damage voltage transformer, even produce potential safety hazard, close between further lead and the lead; Be easy to take place magnetic interference, thereby influence the accuracy of voltage transformer.And lead too much causes complex structure, and lead is intertwined.

In view of the above-mentioned defective of voltage transformer secondary winding earth structure in the prior art, the inventor develops a kind of voltage transformer secondary winding reliable ground structure that overcomes above-mentioned defective, and this case produces thus.

The utility model content

The purpose of the utility model is to provide a kind of and makes winding end and the terminal reliable ground of secondary winding and improve the voltage transformer secondary winding reliable ground structure of fail safe.

For reaching above-mentioned purpose, the solution of the utility model is:

A kind of voltage transformer secondary winding reliable ground structure comprises terminal box, lug, metal base plate, earthing screw and body; Terminal box and this body by integral forming, body and terminal box are installed on the metal base plate; Winding end and secondary winding end are drawn through lug and are cast in the terminal box; Circular hole is set on the lug, and the terminal box correspondence is provided with long through-hole, and correspondence is provided with screwed hole on the metal base plate; After earthing screw passes circular hole, long through-hole successively; Be screwed in the metal base plate screwed hole, earthing screw is crimped on the lug simultaneously, and with the metal base plate conducting; And lug is connected metal base plate ground connection with terminal binding post of winding and the terminal binding post of secondary winding respectively.

Further, terminal box and the moulding of body one poured with epoxy resin.

After adopting such scheme, the utility model compared with prior art has the following advantages:

One, a winding end of the utility model (N) and secondary winding terminal (n) electrically connect through earthing screw and metal base plate respectively; As long as a point of metal base plate ground connection can be realized a winding end (N) and secondary winding terminal (n) ground connection simultaneously; Reduce the earth point of voltage transformer; Further avoid a plurality of leads, can avoid earth connection many and cause short circuit, thereby guarantee the fail safe of voltage transformer.

Two, the utility model utilizes earthing screw to substitute traditional earth lead, not only makes the utility model simple in structure, and can avoid between lead and the lead distance too small and produce and disturb.

Description of drawings

Fig. 1 is the three-dimensional combination figure of prior art;

Fig. 2 is the sectional drawing of the terminal box of prior art;

Fig. 3 is the three-dimensional combination figure of the utility model;

Fig. 4 is the utility model terminal box sketch map

Fig. 5 is the sectional drawing of the utility model terminal box;

Fig. 6 is the circuit diagram of the utility model body;

Fig. 7 is another circuit diagram of the utility model body;

Fig. 8 is a circuit diagram again of the utility model body.

Label declaration

A winding end (N) binding post 10 connecting lines 20

Terminal (n) binding post 30 connecting lines 40 of secondary winding

Base plate 50 bodies 60

Terminal box 70

The utility model

Terminal box 1

A winding end (N) binding post 11

Terminal (n) binding post 12 of secondary winding

Long through-hole 13

Lug 2 circular holes 21

Metal base plate 3 screwed holes 31

Earthing screw 4 bodies 5.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is done detailed explanation.

Consult Fig. 3 and Fig. 4, a kind of voltage transformer secondary winding reliable ground structure that the utility model discloses comprises terminal box 1, lug 2, metal base plate 3, earthing screw 4 and body 5.

Terminal box 1 is installed on the metal base plate 3 with body 5, and terminal box 1 is one-body molded with body 5, can be one-body molded for poured with epoxy resin, and body 5 is the body of voltage transformer in the prior art, the utility model is with voltage transformer body shown in Figure 6; Certainly, body 5 also can be like Fig. 7 and shown in Figure 8, and body 5 is a prior art, does not give unnecessary details here.

Terminal box 1 is provided with a winding end (N) binding post 11 and secondary winding end 12, winding ends of (n) binding post (N) binding post 11 and terminal (n) binding post 12 of secondary winding and respectively connects lug 2; Circular hole 21 is set on the lug 2, and terminal box 1 correspondence is provided with long through-hole 13, and correspondence is provided with screwed hole 31 on the metal base plate 3; Earthing screw 4 is screwed into screwed hole 31 with lug 2 and metal base plate 3 connections after passing circular hole 21, long through-hole 13 successively; Thereby a winding end (N) is communicated with respectively with lug 2 and metal base plate 3 with secondary winding terminal (n); Metal base plate 3 ground connection, i.e. voltage transformer winding reliable ground.Metal base plate 3 is a common technology, connects with ground as long as realize.

During use,, reduce the earth point of voltage transformer, avoid a plurality of leads and cause short circuit as long as 3 one points of metal base plate ground connection can be realized a winding end (N) and secondary winding terminal (n) ground connection simultaneously.Simultaneously, can avoid between lead and the lead distance too small and produce and disturb.

The embodiment that the above is merely the utility model is not the restriction to this case design, and all equivalent variations of doing according to the design key of this case all fall into the protection range of this case.

Claims

1. a voltage transformer secondary winding reliable ground structure is characterized in that: comprise terminal box, lug, metal base plate, earthing screw and body; Terminal box and this body by integral forming, body and terminal box are installed on the metal base plate; Winding end and secondary winding end are drawn through lug and are cast in the terminal box; Circular hole is set on the lug, and the terminal box correspondence is provided with long through-hole, and correspondence is provided with screwed hole on the metal base plate; After earthing screw passes circular hole, long through-hole successively; Be screwed in the metal base plate screwed hole, earthing screw is crimped on the lug simultaneously, and with the metal base plate conducting; And lug is connected metal base plate ground connection with terminal binding post of winding and the terminal binding post of secondary winding respectively.

2. a kind of voltage transformer secondary winding reliable ground structure as claimed in claim 1 is characterized in that: terminal box and the moulding of body one poured with epoxy resin.