CN203133226U

CN203133226U - Polarity testing instrument for current transformer

Info

Publication number: CN203133226U
Application number: CN 201320163236
Authority: CN
Inventors: 刘杰; 杨辉; 季云杰; 王鑫峰; 杨雪莹; 郭凯
Original assignee: State Grid Corp of China SGCC; Tianjin Electric Power Corp
Current assignee: State Grid Corp of China SGCC; Tianjin Electric Power Corp
Priority date: 2013-04-03
Filing date: 2013-04-03
Publication date: 2013-08-14
Anticipated expiration: 2023-04-03

Abstract

The utility model discloses a polarity testing instrument for a current transformer, which comprises a simulated current generating unit and a mutual inductor polarity determination unit. The simulated current generating unit is connected with current input ends at a primary side of the current transformer to be tested. The mutual inductor polarity determination unit is connected with a current output end at a secondary side of the current transformer to be tested. The mutual inductor polarity determination unit determines secondary output current polarity of the current transformer to be tested. The polarity testing instrument for the current transformer has the following beneficial effects: small overall size, high portability, simple operation, and high operation reliability. Tedious operation in the prior-art similar device is changed. Previously, only single phase of the current transformer can be tested, and now three phases of the current transformer can be simultaneously tested. The workload in wire reversing and wire connection is reduced for about 70%. The operation time is shortened for 50%, and the operation efficiency is greatly improved. A pointer type universal meter is replaced by a DC meter head, thereby reducing cost and simultaneously reducing maintenance cost.

Description

Current transformer loop polarity tester

Technical field

The utility model relates to a kind of power industry pick-up unit; The tester that particularly relates to a kind of Current Transformer Secondary side loop polarity.

Background technology

Existing measurement Current Transformer Secondary side loop polarity is to be used by pointer multimeter and direct current first kind battery, there is not special-purpose detecting instrument, detection means is single, particularly can only carry out single-phase test during operation, the battery contact will be touched insecure artificially, and when workload was big, the workload of multimeter line falling, wiring was very big, and easy misconnection, work efficiency is lower.

Summary of the invention

Technical problem to be solved in the utility model is, provide a kind of can be to tester single-phase or threephase current transformer secondary circuit polarity measurement.

The technical scheme that the utility model adopts is: a kind of current transformer loop polarity tester comprises analog current generation unit and mutual inductor polarity identifying unit; Described analog current generation unit is connected with A, B, the C three-phase current input end of threephase current transformer primary side to be measured respectively; Described mutual inductor polarity identifying unit is connected with A, B, the C three-phase current output terminal of Current Transformer Secondary side to be measured respectively, and described mutual inductor polarity identifying unit detects the secondary output current polarity of threephase current transformer to be measured.

Described analog current generation unit comprises, battery, total power switch, conducting button and connection terminal; The positive pole of described battery is connected with an end of total power switch, and the other end of total power switch is connected with the conducting button; One end of conducting button is connected with connection terminal one end, and the connection terminal other end is connected with battery cathode; Described mutual inductor polarity identifying unit comprises, three DC current gauge outfits, three-phase binding post and three toggle switchs; Described three DC current gauge outfits are connected in series respectively with every phase secondary current output terminal, three-phase binding post and three toggle switchs of current transformer to be measured respectively.

The beneficial effects of the utility model are that this testing tool integral body is little, portable, and is simple to operate, reliable operation, it is loaded down with trivial details to have changed original operation, in the past, can only test the single-phase current mutual inductor during detection, now threephase current transformer can be tested simultaneously, and it is nearly 70% to have reduced line falling, wiring workload, shortens working hours 50%, increase substantially work efficiency, replace pointer multimeter by the DC current gauge outfit, reduced cost, maintenance cost also reduces simultaneously.

Description of drawings

Fig. 1 is the wiring diagram of the utility model current transformer loop polarity tester;

Fig. 2 is the fundamental diagram of the utility model current transformer loop polarity test.

Among the figure:

1. connection terminal 2. conducting buttons 3. total power switch 4. batteries

5. toggle switch 6. DC current gauge outfits 7. binding posts.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:

Extremely shown in Figure 2 as Fig. 1, the utility model current transformer loop polarity tester, the secondary output current polarity of detection threephase current transformer comprises analog current generation unit 10 and mutual inductor polarity identifying unit 20; Described analog current generation unit 10 is connected with A, B, the C three-phase current input end of threephase current transformer primary side to be measured respectively; Described mutual inductor polarity identifying unit 20 is connected with A, B, the C three-phase current output terminal of Current Transformer Secondary side to be measured respectively, and described mutual inductor polarity identifying unit 20 detects the secondary output current polarity of threephase current transformer to be measured.Described analog current generation unit 10 comprises, battery 4, total power switch 3, conducting button 2 and connection terminal 1; The positive pole of described battery 4 is connected with an end of total power switch 3, and the other end of total power switch 3 is connected with conducting button 2; One end of conducting button 2 is connected with connection terminal 1 one ends, and connection terminal 1 other end is connected with battery 4 negative poles; Described mutual inductor polarity identifying unit 20 comprises, three DC current gauge outfits 6, three-phase binding post 7 and three toggle switchs 5; Described three DC current gauge outfits 6 are connected in series respectively with every phase secondary current output terminal, three-phase binding post 7 and three toggle switchs 5 of current transformer to be measured respectively.

The principle of work of this tester is: with the separate respectively wiring of Current Transformer Secondary terminal in mutual inductor polarity identifying unit and the switch cubicle cell according to corresponding alternating current, the analog current generation unit is connected according to separate with the current transformer primary side, need during detection to cooperate simultaneously, when pressing analog current generation unit conducting button, just simulate the process that primary current flows into current transformer to be measured, simultaneously, the DC current meter pointer of mutual inductor polarity identifying unit is swung, the process of Current Transformer Secondary side output current just, the positive-negative polarity of the direction determining Current Transformer Secondary side to be measured by the swing of DC current meter pointer.

This testing tool integral body is little, portable, simple to operate, reliable operation, it is loaded down with trivial details to have changed original operation, in the past, and during detection, can only test the single-phase current mutual inductor, now, every phase of threephase current transformer can be tested simultaneously, has reduced line falling, wiring workload nearly 70%, shorten working hours 50%, increase substantially work efficiency, in the past, every price of pointer multimeter was about 300 yuan, every DC current gauge outfit price is at 30 yuan now, replace pointer multimeter by the DC current gauge outfit, reduced cost, maintenance cost also reduces by 90% simultaneously.

It is worthy of note that protection scope of the present invention is not limited to above-mentioned instantiation mode, according to basic fundamental design of the present invention, also can detect the secondary output current polarity of single-phase current mutual inductor; As long as those of ordinary skills need not through creative work, the embodiment that can associate all belongs to protection scope of the present invention.

Claims

1. a current transformer loop polarity tester is characterized in that, comprises analog current generation unit (10) and mutual inductor polarity identifying unit (20); Described analog current generation unit (10) is connected with A, B, the C three-phase current input end of threephase current transformer primary side to be measured respectively; Described mutual inductor polarity identifying unit (20) is connected with A, B, the C three-phase current output terminal of Current Transformer Secondary side to be measured respectively, and described mutual inductor polarity identifying unit (20) detects the secondary output current polarity of threephase current transformer to be measured.

2. current transformer loop polarity tester according to claim 1 is characterized in that, described analog current generation unit comprises, battery (4), total power switch (3), conducting button (2) and connection terminal (1); The positive pole of described battery (4) is connected with an end of total power switch (3), and the other end of total power switch (3) is connected with conducting button (2); One end of conducting button (2) is connected with connection terminal (1) one end, and connection terminal (1) other end is connected with battery (4) negative pole; Described mutual inductor polarity identifying unit comprises, three DC current gauge outfits (6), three-phase binding post (7) and three toggle switchs (5); Described three DC current gauge outfits (6) are connected in series respectively with every phase secondary current output terminal, three-phase binding post (7) and three toggle switchs (5) of current transformer to be measured respectively.