CN201340796Y

CN201340796Y - Measuring current transformer

Info

Publication number: CN201340796Y
Application number: CNU2009201013959U
Authority: CN
Inventors: 薛晚道; 王文娣; 赵颜真; 董洪革; 张伟明; 刘秀凤
Original assignee: Baoding Tianwei Group Co Ltd
Current assignee: Baoding Tianwei Group Co Ltd
Priority date: 2009-02-02
Filing date: 2009-02-02
Publication date: 2009-11-04
Anticipated expiration: 2019-02-02

Abstract

The utility model provides a measuring current transformer, and relates to the technical field of current transformers. The measuring current transformer comprises a measuring current transformer body, and is characterized in that a secondary circuit of the current transformer body is connected with a reactor in parallel and used integrally with the reactor. The utility model has the positive effects that the current transformer not only can meet the specified accuracy class requirements under the normal working condition, but also when meeting the high current impulse, the secondary current cannot strictly be increased proportionally, and the impact on the apparatuses and instruments are decreased, thereby ensuring the requirements of security coefficients for the instruments. The measuring current transformer can be widely used in the field of current transformers.

Description

A kind of Verification of Measuring Current Transformer

Technical field

The utility model relates to the current transformer technical field.

Background technology

The very big overcurrent that often has the current transformer that uses in the electric power system flows through its winding, be the unlikely impact that is subjected to big electric current of instrument, the instrument of avoiding transformer secondary circuit, wish Verification of Measuring Current Transformer under overcurrent situations secondary current no longer strictness increase in proportion, therefore the requirement of instrument safety coefficient has been proposed.So-called instrument safety coefficient (FS) is meant the ratio of instrument security personnel's electric current and rated primary current.Instrument security personnel electric current is meant Verification of Measuring Current Transformer under specified secondary load, and its composite error is not less than 10% minimum primary current.And the conventional current transformer made from the silicon steel iron core generally can not satisfy this requirement.

Summary of the invention

The purpose of this utility model provides a kind of Verification of Measuring Current Transformer, not only under normal operation, can satisfy the class of accuracy requirement of regulation, and when heavy current impact, secondary current no longer strictness increases in proportion, impact to instrument, instrument reduces, and can guarantee the requirement of instrument safety coefficient.

Main technical schemes of the present utility model is: a kind of Verification of Measuring Current Transformer, comprise the Verification of Measuring Current Transformer body, and it is characterized in that the secondary circuit of current transformer body is parallel with reactor, one is used.

Described reactor preferred construction is: have unshakable in one's determination 1, iron core can be shapes such as annular, rectangle, oblateness, bar shaped, core material can be materials such as electrical steel strip, ultracrystallite, permalloy, on unshakable in one's determination 1, be wound with copper cash winding 2, the outside of copper cash winding 2 is provided with insulating barrier 3, and copper cash winding 2 has two or more leading-out ends.

Principle of the present utility model is: at the secondary circuit of current transformer reactor in parallel, under normal operation, the resistance value Z of reactor is very big, and is very little to the shunting action of load branch circuit, can satisfy the class of accuracy requirement of regulation, when primary current reaches certain value, iron core of electric reactor is saturated, and the Z value reduces rapidly, and shunting action obviously increases, the growth rate of load branch circuit electric current is slowed down, thereby guarantee the requirement of instrument safety coefficient.

Good effect of the present utility model is: compared with prior art, not only under normal operation, can satisfy the class of accuracy requirement of regulation, and when heavy current impact, secondary current no longer strictness increases in proportion, impact to instrument, instrument reduces, and can guarantee the requirement of instrument safety coefficient.Can be widely used in the current transformer field.

Be described further below in conjunction with drawings and Examples, but not as to qualification of the present utility model.

Description of drawings

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is the structural representation of piece number 5 reactors in the utility model.

Fig. 3 is the vertical view of Fig. 2.

Among Fig. 1～Fig. 3, the implication of each label is: 1---iron core, 2---copper cash, 3---insulation, 4---Verification of Measuring Current Transformer, 5---reactor.

Embodiment

Referring to Fig. 1～Fig. 3, this Verification of Measuring Current Transformer comprises Verification of Measuring Current Transformer body 4, is that the secondary circuit of current transformer body 4 is parallel with reactor 5.Described reactor has iron core 1, is wound with copper cash winding 2 on unshakable in one's determination 1, and the outside of copper cash winding 2 is provided with insulating barrier 3, and copper cash winding 2 has two or more leading-out ends.The leading-out end of reactor and Verification of Measuring Current Transformer body 4 corresponding secondary leading-out ends are connected in parallel to use and get final product.

Claims

1, a kind of Verification of Measuring Current Transformer comprises Verification of Measuring Current Transformer body (4), it is characterized in that the secondary circuit of current transformer body (4) is parallel with reactor (5).

2, according to the described Verification of Measuring Current Transformer of claim 1, it is characterized in that described reactor has iron core (1), is wound with copper cash winding (2) on (1) unshakable in one's determination, the outside of copper cash winding (2) is provided with insulating barrier (3), and copper cash winding (2) has two or more leading-out ends.