CN101521103A

CN101521103A - Grounding method of primary coil N end of relatively semi-insulating electromagnetic voltage transformer and iron core

Info

Publication number: CN101521103A
Application number: CN200810072163A
Authority: CN
Inventors: 王继元; 李静; 惠兆鹏; 符祥强
Original assignee: Dalian No1 Instrument Transformer Co Ltd
Current assignee: Dalian No1 Instrument Transformer Co Ltd
Priority date: 2008-11-14
Filing date: 2008-11-14
Publication date: 2009-09-02

Abstract

The invention discloses a grounding method of a primary coil N end of a relatively semi-insulating electromagnetic voltage transformer and an iron core. An outgoing line of the primary coil N end is connected with the iron core inside a casting body, and the N end is then led out of the iron core and subjected to operational grounding with a connecting sheet. In the method, when the product does not operate, neither of the N end and the iron core is grounded; and when the product operates, the N end and the iron core are grounded simultaneously, and the iron core is connected with an insert of an installation base plate. When malfunction occurs, the electric potential of the iron core and the N end which are connected together is the same, electric potential difference does not exist at the grounding point inside the casting body, the product can not be damaged, and the insulation safety performance and normal use of the transformer are ensured.

Description

Relatively semi-insulating electromagnetic voltage transformer primary winding N holds and earthing method unshakable in one's determination

Technical field

The present invention relates to the technical field of electromagnetic potential transformer, with relatively semi-insulating electromagnetic voltage transformer primary winding N end is relevant with earthing method unshakable in one's determination.

Background technology

In the prior art, relatively semi-insulating electromagnetic voltage transformer as shown in Figure 1, the N of its primary winding 10 end 20 is to adopt independent outlet and brace 50 operation ground connection, inside is not connected with iron core 30.This makes N end 20 not reach the insulation level that secondary coil has 3KV or 5KV over the ground under the ruuning situation.And iron core 30 is connected with installation base plate inserts 40, no matter whether product moves, unshakable in one's determination 30 all guarantee effective grounding always, when this state adopts the non-effective earthing method when the N of product primary winding 10 end 20, promptly as shown in Figure 2, the N end 20 of primary winding 10 is through excessive resistance R earthing method, be not direct ground connection, if resonance or other faults (over the ground single-phase) occur such as circuit, N end 20 and unshakable in one's determination 30 produces the maximum potential difference that reaches phase voltage, this potential difference influences the product insulation property during greater than 3KV or 5KV, and serious can burn instrument transformer.

In view of this, the inventor improves for the earthing method of existing voltage transformer primary winding N end with iron core, and this case produces thus.

Summary of the invention

The object of the present invention is to provide the earthing method of a kind of relatively semi-insulating electromagnetic voltage transformer primary winding N end and iron core, to guarantee the insulating properties of product, guarantee the normal use of transformer.

In order to reach above-mentioned purpose, solution of the present invention is:

Relatively semi-insulating electromagnetic voltage transformer primary winding N end and earthing method unshakable in one's determination, with the N of primary winding bring out line at pour mass inner and unshakable in one's determination the connection, draw the N end again from iron core, N end and brace operation ground connection, iron core is connected with installation base plate inserts.

Described N end of drawing again from iron core adopts effective grounding or through excessive resistance eutral grounding.

Described primary winding N end and tie point unshakable in one's determination and draw again the leading point that N holds from iron core and overlap.

Described primary winding N end and tie point unshakable in one's determination and to draw the leading point of N end from iron core spaced apart again.

After adopting said structure, the present invention is because directly link together the N end in pour mass inside with iron core, and when product did not move, the N end was all earth-free with iron core, when product moves, and N end and simultaneously ground connection unshakable in one's determination.When breaking down, the iron core that links together is identical with the current potential of N end, and there is not potential difference in pour mass internal interface place, can not damage product, guarantees insulation safety performance and normal use of transformer.

Description of drawings

Fig. 1 is prior art primary winding N end and earthing method schematic diagram unshakable in one's determination;

Fig. 2 is that prior art N end adopts non-effective earthing method schematic diagram;

Fig. 3 is a structural representation of the present invention.

Specific implementation method

As shown in Figure 3, be preferable case study on implementation of the present invention.

The present invention has disclosed a kind of primary winding of semi-insulating electromagnetic voltage transformer relatively N end and earthing method unshakable in one's determination, be that N with primary winding 1 holds 2 outlets to be connected with iron core 3 in that pour mass is inner, then, draw N end 21 again from unshakable in one's determination 3, specifically can be with the N of primary winding 1 end 2 and unshakable in one's determination 3 tie point and draw N again from unshakable in one's determination 3 and hold 21 leading points to overlap, perhaps as shown in Figure 3, with the N of primary winding 1 end 2 and unshakable in one's determination 3 tie point with to draw the leading point of N end 21 again from unshakable in one's determination 3 spaced apart, then, with this N end 21 and brace 5 operation ground connection, this N end 21 can adopt effective grounding or through excessive grounding through resistance (as shown in Figure 2).Unshakable in one's determination 3 still are connected with mounting base inserts 4.

The present invention compared with prior art because directly the N of primary winding 1

end

2,21 is linked together with unshakable in one's determination 3 in pour mass inside, like this, when product did not move, N end 21 was all earth-free with unshakable in one's determination 3, when product move, N end 21 and 3 while of iron core ground connection.When breaking down, the iron core 3 that links together is identical with the current potential of N end 21, does not have potential difference, can not damage product, guarantees the safety of transformer.

Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present invention to its suitable variation or modification of doing.

Claims

1, relatively semi-insulating electromagnetic voltage transformer primary winding N holds and earthing method unshakable in one's determination, it is characterized in that: the N of primary winding is brought out line in pour mass inside and unshakable in one's determination the connection, draw again the N end from iron core, N end and brace operation ground connection, iron core is connected with the mounting base inserts.

2, as claimed in claim 1 relatively semi-insulating electromagnetic voltage transformer primary winding N end and earthing method unshakable in one's determination is characterized in that: described N end of drawing again from iron core adopts effective grounding or through excessive resistance eutral grounding.

3, as claimed in claim 1 relatively semi-insulating electromagnetic voltage transformer primary winding N end and earthing method unshakable in one's determination is characterized in that: described primary winding N end and tie point unshakable in one's determination and draw the leading point that N holds from iron core again and overlap.

4, as claimed in claim 1 relatively semi-insulating electromagnetic voltage transformer primary winding N end and earthing method unshakable in one's determination is characterized in that: described primary winding N end and tie point unshakable in one's determination and to draw the leading point of N end from iron core spaced apart again.