CN203133226U - Polarity testing instrument for current transformer - Google Patents

Abstract

The utility model discloses a current transformer loop polarity tester, which comprises an analog current generating unit and a transformer polarity determination unit; the analog current generating unit is respectively connected with the current input end of the primary side of the current transformer to be tested; The polarity judging unit of the transformer is connected with the current output terminal of the secondary side of the current transformer to be tested, and the polarity judging unit of the transformer detects the polarity of the secondary output current of the current transformer to be tested. The beneficial effect is that the test instrument is small, portable, simple to operate, and reliable in operation, which changes the original tedious operation. Before, only single-phase current transformers can be tested during detection. Now three-phase current transformers can be tested simultaneously, reducing The workload of reversing and wiring is reduced by nearly 70%, the working time is shortened by 50%, and the work efficiency is greatly improved. The DC current meter replaces the pointer multimeter, which reduces the cost and maintenance cost.

Description

Current Transformer Loop Polarity Tester

technical field

The utility model relates to a detection device used in the electric power industry, in particular to a tester for the polarity of the secondary side circuit of a current transformer.

Background technique

The current polarity of the secondary side circuit of the current transformer is measured by a pointer multimeter and a DC battery. There is no special detection instrument, and the detection method is single. In particular, only single-phase testing can be performed during operation. The artificial touch is not firm, and when the workload is heavy, the workload of the multimeter is very heavy, and it is easy to make mistakes, and the work efficiency is low.

Contents of the invention

The technical problem to be solved by the utility model is to provide a tester capable of measuring the polarity of the secondary circuit of a single-phase or three-phase current transformer.

The technical solution adopted by the utility model is: a current transformer loop polarity tester, including an analog current generating unit and a transformer polarity determination unit; the analog current generating unit is connected with the three-phase current transformer to be tested The A, B, and C three-phase current input ends of the primary side are connected; the transformer polarity determination unit is respectively connected with the A, B, and C three-phase current output ends of the secondary side of the current transformer to be tested, and the transformer The polarity determination unit detects the polarity of the secondary output current of the three-phase current transformer to be tested.

The analog current generating unit includes a battery, a main power switch, a conduction button and a connection terminal; the positive pole of the battery is connected to one end of the general power switch, and the other end of the general power switch is connected to the conduction button; the conduction button One end is connected to one end of the terminal, and the other end of the terminal is connected to the negative pole of the battery; the transformer polarity determination unit includes three DC current meter heads, three-phase terminal posts and three toggle switches; the three DC ammeters The heads are respectively connected in series with the secondary current output terminals of each phase of the current transformer to be tested, the three-phase binding posts and the three toggle switches.

The beneficial effect of the utility model is that the test instrument is small and portable as a whole, simple to operate, reliable in operation, and has changed the original tedious operation. In the past, only single-phase current transformers could be tested during detection. At the same time, the test has reduced the workload of wire reversing and wiring by nearly 70%, shortened the working time by 50%, and greatly improved the work efficiency. The DC current meter replaces the pointer multimeter, which reduces the cost and maintenance cost.

Description of drawings

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

Fig. 2 is a working principle diagram of the circuit polarity test of the current transformer of the present invention.

In the picture:

1. Terminal block 2. On button 3. Main power switch 4. Battery

5. Button switch 6. DC ammeter head 7. Binding post.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

As shown in Figures 1 to 2, the current transformer loop polarity tester of the present invention detects the secondary output current polarity of the three-phase current transformer, including an analog current generation unit 10 and a transformer polarity determination unit 20 ; The analog current generation unit 10 is connected with the A, B, and C three-phase current input ends of the primary side of the three-phase current transformer to be measured respectively; The A, B, and C three-phase current output terminals on the side are connected, and the transformer polarity determination unit 20 detects the secondary output current polarity of the three-phase current transformer to be tested. The analog current generating unit 10 includes a battery 4, a main power switch 3, a conduction button 2 and a connection terminal 1; the positive pole of the battery 4 is connected to one end of the main power switch 3, and the other end of the main power switch 3 is connected to the lead. The on-button 2 is connected; one end of the on-button 2 is connected to one end of the terminal 1, and the other end of the terminal 1 is connected to the negative pole of the battery 4; Terminal 7 and three button switches 5; the three DC current meters 6 are respectively connected in series with the secondary current output terminal of each phase of the current transformer to be tested, the three-phase terminal 7 and the three button switches 5 .

The working principle of this tester is: connect the transformer polarity determination unit and the secondary terminal of the current transformer in the switch cabinet according to the phases of the corresponding alternating current, and connect the analog current generation unit and the primary side of the current transformer according to the phases. The detection needs to be coordinated at the same time. When the conduction button of the analog current generating unit is pressed, the process of simulating the primary current flowing into the current transformer to be tested is simulated. At the same time, the pointer of the DC current meter of the transformer polarity determination unit swings, that is, In the process of outputting current from the secondary side of the current transformer, the positive and negative polarities of the secondary side of the current transformer to be tested are judged by the direction in which the pointer of the DC current meter swings.

This test instrument is small, portable, easy to operate, and reliable in operation, changing the original cumbersome operation. In the past, only single-phase current transformers could be tested during testing. Now, each phase of three-phase current transformers can be tested simultaneously. It has reduced the workload of reversing and wiring by nearly 70%, shortened the working time by 50%, and greatly improved the work efficiency. In the past, the price of each pointer multimeter was about 300 yuan, but now the price of each DC current meter is 30 yuan. The ammeter head replaces the pointer multimeter, which reduces the cost, and the maintenance cost is also reduced by 90%.

It is worth pointing out that the scope of protection of the present invention is not limited to the above-mentioned specific examples. According to the basic technical concept of the present invention, the polarity of the secondary output current of the single-phase current transformer can also be detected; as long as those skilled in the art do not need to go through Creative work, that is, conceivable implementation methods, all belong to the protection scope of the present invention.

Claims (2)

1. A current transformer loop polarity tester, characterized in that it includes an analog current generation unit (10) and a transformer polarity determination unit (20); the analog current generation unit (10) is connected to the tested The A, B, C three-phase current input ends of the primary side of the three-phase current transformer are connected; the transformer polarity determination unit (20) is respectively connected with the A, B, C three-phase current The output terminals are connected, and the transformer polarity determination unit (20) detects the secondary output current polarity of the three-phase current transformer to be tested. 2. The current transformer loop polarity tester according to claim 1, characterized in that the analog current generating unit includes a battery (4), a main power switch (3), a conduction button (2) and wiring terminal (1); the positive pole of the battery (4) is connected to one end of the main power switch (3), and the other end of the main power switch (3) is connected to the conduction button (2); one end of the conduction button (2) It is connected to one end of the terminal (1), and the other end of the terminal (1) is connected to the negative pole of the battery (4); the transformer polarity determination unit includes three DC current meter heads (6), three-phase terminal (7) ) and three button switches (5); the three DC current meters (6) are respectively connected to the secondary current output terminal of each phase of the current transformer to be tested, the three-phase terminal (7) and the three button switches (5) Connect in series respectively.

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