CN203242489U

CN203242489U - Measuring current transformer with tap for ultra-high voltage power system

Info

Publication number: CN203242489U
Application number: CN 201320223287
Authority: CN
Inventors: 张树华; 林永洪; 张丽珍
Original assignee: GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd
Current assignee: GUANGDONG SIHUI INSTRUMENT TRANSFORMER WORKS CO Ltd
Priority date: 2013-04-26
Filing date: 2013-04-26
Publication date: 2013-10-16
Anticipated expiration: 2023-04-26

Abstract

The utility model provides a measuring current transformer with a tap for an ultra-high voltage power system. The measuring current transformer with the tap for the ultra-high voltage power system is mainly composed of two iron cores, three coils, three outgoing line terminals and the like. One coil is wound on one iron core, and after the wound coil is overlapped with the second iron core, the rest coils are wound. Different working states are used for enabling the measuring current transformer to meet the accuracy class requirement in the measuring process of a large current span and also meet the requirement of an instrument security coefficient.

Description

The Verification of Measuring Current Transformer with tap that a kind of ultrahigh voltage power system uses

Technical field

The utility model relates to a kind of current transformer, especially relates to the Verification of Measuring Current Transformer with tap that a kind of ultrahigh voltage power system uses, and belongs to the technical field of High-Voltage Electrical Appliances, is measuring current transformer in a kind of electric power system.

Background technology

In high pressure, ultrahigh voltage power system, Verification of Measuring Current Transformer has requirement to accuracy class and instrument safety coefficient at present.

Verification of Measuring Current Transformer is a kind of special transformer that the information of large electric current is delivered to the measuring instrument of secondary side, is the contact element of primary system and electrical secondary system, its winding access electrical network, and secondary winding and measuring instrument etc. are connected.Accuracy class for Verification of Measuring Current Transformer is more high better, and the instrument safety coefficient is then the smaller the better, and in China 500kV and above electric power system, it is 0.2S that the current transformer of measuring level has the standard code precision, and the instrument safety coefficient is FS5.In same current transformer, improve accuracy class and will reduce magnetic flux density, but the reduction of magnetic flux density can make saturated multiple unshakable in one's determination increase, the instrument safety coefficient also can increase thereupon, so when same current transformer has a plurality of tap, need two or more current transformers could satisfy simultaneously this two requirements.

Summary of the invention

Problem to be solved in the utility model is: for the problem of prior art existence, the Verification of Measuring Current Transformer with tap that provides a kind of ultrahigh voltage power system to use, solve the accuracy class of existing Verification of Measuring Current Transformer and the contradiction between the instrument safety coefficient, make it to reach requirement.

In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:

The Verification of Measuring Current Transformer with tap that a kind of ultrahigh voltage power system uses mainly is comprised of two iron cores, three coils and three outlet terminals, and described second coil is identical with the number of turn of the 3rd coil winding, around on the contrary.

Described first coil winding is on second iron core, and second, third coil is wound on first, second iron core simultaneously.

Described second iron core winds behind first coil unshakable in one's determination overlapping with first again.

The beneficial effects of the utility model are: Verification of Measuring Current Transformer each current ratio in large electric current span band tap Verification of Measuring Current Transformer winding with tap that a kind of ultrahigh voltage power of the utility model system uses can separately design, and satisfies simultaneously high accuracy grade and the requirement of instrument safety coefficient; The function that realizes from the two or more current transformers of original needs is to only needing a current transformer just can realize, thereby reduced the input of power equipment.

Description of drawings

Fig. 1 is schematic diagram of the present utility model;

Fig. 2 is structural representation of the present utility model.

First iron core of T1-; Second iron core of T2-; First coil of N1-; Second coil of N2-; The 3rd coil of N3-; First outlet terminal of S1-; Second outlet terminal of S2-; The 3rd outlet terminal of S3-.

Embodiment

The Verification of Measuring Current Transformer with tap that a kind of ultrahigh voltage power system uses, mainly formed by two T1 unshakable in one's determination and T2, three coil N1, N2 and N3 and three outlet terminal S1, S2 and S3, described second coil N2 is identical with the number of turn of the 3rd coil N3 coiling, around on the contrary.

Described first coil N1 is wound on second T2 unshakable in one's determination, and second coil N2, the 3rd coil N3 are wound on the first T1 unshakable in one's determination, the second T2 unshakable in one's determination simultaneously.

Described second T2 unshakable in one's determination winds behind first coil N1 overlapping with first T1 unshakable in one's determination again.

When Verification of Measuring Current Transformer is operated in rated current, secondary terminals and outlet terminal S1, S3 connects, the coil total number of turns is three coil N1, N2, the total number of turns of N3, again because second coil N2 is identical with the number of turn of the 3rd coil N3 coiling, around on the contrary, so the actual number of turn of coil is the number of turn of first coil N1, and first coil N1 is only on second T2 unshakable in one's determination, so iron core only considers on second T2 unshakable in one's determination, can second T2 unshakable in one's determination and first coil N1 meet the requirement of accuracy class and instrument safety coefficient when design only needed to consider current transformer by rated current.

When operation of current transformers during at the tap electric current, secondary terminals is connected with outlet terminal S1, S2.The coil total number of turns of this moment only has second coil N2, and iron core equals the stack of first T1 unshakable in one's determination, second T2 unshakable in one's determination.The tap electric current is less than rated current, and the less magnetic flux density of electric current is larger, and error does not often reach desirable requirement, so can reduce by the sectional area of adjusting first T1 unshakable in one's determination magnetic flux density unshakable in one's determination when designing, makes the precision of current transformer reach requirement.

Claims

1. the Verification of Measuring Current Transformer with tap that the ultrahigh voltage power system uses mainly is comprised of two iron cores, three coils and three outlet terminals, and it is characterized in that: described second coil is identical with the number of turn of the 3rd coil winding, around on the contrary.

2. the Verification of Measuring Current Transformer with tap used of a kind of ultrahigh voltage power according to claim 1 system, it is characterized in that: described first coil winding is on second iron core, and second, third coil is wound on first, second iron core simultaneously.

3. the Verification of Measuring Current Transformer with tap used of a kind of ultrahigh voltage power according to claim 1 system is characterized in that: described second iron core winds behind first coil unshakable in one's determination overlapping with first again.