CN105527538A - Polarity test device of current transformer - Google Patents

Abstract

The invention provides a polarity testing device for a current transformer, comprising: a power supply, having a negative pole for connecting the ground terminal of the primary side coil of the current transformer; a plurality of primary side switches, each of which is connected to the power supply Between the positive pole of the current transformer and the access terminal of one phase of the primary side coil for connecting the current transformer; the polarity test part has a first terminal and a second terminal, wherein the first terminal and the terminal for connecting the current transformer The access terminal of the ground terminal of the secondary side coil is connected; a plurality of secondary side switches, each secondary side switch is connected to the second terminal and the input terminal of one phase of the secondary side coil for connecting the current transformer Among them, the number of primary side switches is the same as the number of secondary side switches. By setting the primary side coil corresponding to each current transformer and the corresponding secondary side coil to the on state, the polarity of the current transformer can be detected, which effectively improves the efficiency of current transformer polarity detection .

Description

Polarity test device for current transformers

technical field

The invention relates to a polarity testing device for a current transformer.

Background technique

Fig. 1 shows a circuit diagram of a method for testing the polarity of a current transformer by a direct current method in the prior art. Connect the positive pole of the 1.5~3V dry battery to the primary coil L1 of the transformer, the negative pole of the battery to L2, the secondary side K1 of the transformer to the positive pole of the mA meter, and the negative pole to K2. After connecting the wires, close K to the mA meter The pointer of the meter is positively biased, and the pointer of the mA meter is negatively biased after pulling it apart, indicating that the terminal connected to the positive terminal of the battery and the terminal connected to the positive terminal of the mA meter are of the same polarity, that is, L1 and K1 are of the same polarity. If the pointer swing is opposite to the above, it is the reverse polarity.

In the testing method of the prior art, after the polarity of a current transformer is measured, its wiring is removed and moved to another current transformer for testing, which requires a lot of manpower and a large workload, which is cumbersome.

Contents of the invention

The invention aims to provide a polarity testing device of a current transformer which improves testing efficiency.

In order to achieve the above object, the present invention provides a polarity testing device for a current transformer, comprising: a power supply having a negative pole for connecting the ground terminal of the primary side coil of the current transformer; a plurality of primary side switches, each primary side The switches are respectively connected between the positive pole of the power supply and the access terminal for connecting one phase of the primary side coil of the current transformer; the polarity test component has a first terminal and a second terminal, wherein the first terminal and the The access terminal connected to the ground terminal of the secondary side coil of the current transformer; a plurality of secondary side switches, each secondary side switch is connected to the second terminal and one of the secondary side coils for connecting the current transformer Between the input terminals of the phases, the number of primary side switches is the same as the number of secondary side switches.

Further, the polarity testing device further includes a controller, and the controller has a plurality of output terminals for outputting switch on-off control signals, wherein each output terminal is connected to a primary-side switch or a secondary-side switch.

Further, the polarity testing device further includes a communication component, which is connected to the input end of the controller for receiving the on-off control signal of the switch.

Further, the communication component is a wireless communication component.

Further, the number of the multiple primary side switches is three corresponding to the three phases of the power line.

Further, the number of secondary side switches is three corresponding to the three phases of the power line.

Further, the polarity testing component includes an ammeter.

Further, the polarity testing component includes a light emitting diode.

Applying the technical solution of the present invention, by putting the primary side coil corresponding to each current transformer and the corresponding secondary side coil in the on state, the polarity of the current transformer can be detected, effectively improving the current Efficiency of transformer polarity detection.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 shows the wiring diagram of the polarity testing device of the current transformer and the primary side coil of the current transformer according to the embodiment of the present invention;

Fig. 2 shows the connection diagram of the polarity testing device of the current transformer and the secondary side coil of the current transformer according to the embodiment of the present invention.

Reference signs: 1. Power supply; 2. Primary side switch; 3. Polarity testing component; 31. First terminal; 32. Second terminal; 4. Secondary side switch.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in Fig. 1 and Fig. 2, the polarity test device of the current transformer of the embodiment of the present invention comprises: a power supply 1, has a negative pole for connecting the ground terminal of the primary side coil of the current transformer; a plurality of primary side switches 2, Each primary side switch 2 is respectively connected between the positive pole of the power supply and the access terminal for connecting one phase of the primary side coil of the current transformer; the polarity testing part 3 has a first end 31 and a second end 32, Wherein, the first end is connected to the access end for connecting the ground end of the secondary side coil of the current transformer; a plurality of secondary side switches 4, each secondary side switch 4 is respectively connected to the second end and used for connecting Between the access terminals of one phase of the secondary side coil of the current transformer, the number of primary side switches 2 is the same as the number of secondary side switches 4 .

In this embodiment, a plurality of current transformers are connected to the power supply 1 in selectable on-off states. When measuring the polarity of the current transformer, one of the multiple primary side switches 2 is in the conduction state, and the power supply 1 is the primary side of the current transformer connected to the primary side switch 2 in the conduction state. The side coil is powered, and at the same time, the secondary side switch corresponding to the energized current transformer is turned on, and the polarity of the current transformer is detected by using a polarity test component. The polarity of each current transformer is tested by controlling multiple current transformers to be sequentially connected to the power supply 1 . The efficiency of testing the current transformer is effectively improved. The labor intensity of testers is reduced.

Preferably, the polarity testing device further includes a controller, and the controller has a plurality of output terminals for outputting switch on-off control signals, wherein each output terminal is connected to a primary-side switch or a secondary-side switch. The controller can be used to sequentially control one side coil of a current transformer to be energized, and control the conduction of the secondary side switch corresponding to the energized current transformer to detect the polarity of the energized current transformer, and further improved detection efficiency.

The polarity testing device also includes a communication part, which is connected to the input end of the controller for receiving the on-off control signal of the switch. The corresponding primary side switch 2 and the corresponding secondary side switch 4 can be artificially controlled to be turned on through the communication component, so as to detect the polarity of the corresponding current transformer.

Preferably, the communication means is a wireless communication means. It can be realized that the corresponding primary side switch 2 and the corresponding secondary side switch 4 are turned on through the remote control, so as to detect the polarity of the corresponding current transformer.

Preferably, the number of the plurality of primary side switches is three corresponding to the three phases of the power line.

The current transformer polarity testing device in this embodiment is used to test the polarity of the three current transformers corresponding to the three live wires A, B and C. The three primary side switches 2 correspond to the three live wires A, B and C respectively. The primary side coils of the current transformers corresponding to the three live wires A, B and C are all electrically connected to the positive pole of the power supply 1 in a selectable on-off state. The negative pole of the power supply is electrically connected to the ground wire N.

Also preferably, the polarity testing device includes a plurality of power supplies 1 arranged in one-to-one correspondence with a plurality of current transformers, each power supply 1 is electrically connected to a corresponding current transformer, and each primary side switch 2 is connected in series to a corresponding Between the current transformer and the corresponding power supply 1.

Preferably, the number of the plurality of secondary side switches is three corresponding to the three phases of the power line.

The secondary side coils of the three current transformers corresponding to the three live wires A, B and C are all connected to the polarity testing component 3 . The three secondary side switch units are all arranged between the secondary side coil of the corresponding current transformer and the first end connection of the polarity testing component 3 . The second end of the polarity testing component 3 is electrically connected to the ground N. The three secondary side switches 4 are respectively arranged between the corresponding current transformers and the polarity testing component 3 .

In this embodiment, the polarity testing device is an ammeter. It can also be preferred to use a light-emitting diode or a voltmeter as the polarity-measuring component of the measuring current transformer.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. a polarity test device for current transformer, is characterized in that, comprising:

Power supply (1), has the negative pole of the earth terminal of the first siding ring for connecting current transformer;

Multiple primary side switch (2), each described primary side switch (2) is connected between the positive pole of described power supply and the incoming end for a phase of the first siding ring that connects described current transformer;

Polarity test parts (3), have first end (31) and the second end (32), and wherein, described first end connects with the incoming end of the earth terminal of the second siding ring for being connected described current transformer;

Multiple secondary side switches (4), each described secondary side switches (4) is connected between described second end and the incoming end for a phase of the second siding ring that connects described current transformer, wherein, the number of described primary side switch (2) is identical with the number of described secondary side switches (4).

2. polarity test device according to claim 1, it is characterized in that, described polarity test device also comprises controller, described controller has multiple output terminal for output switch break-make control signal, wherein, each described output terminal is connected with a described primary side switch or a described secondary side switches.

3. polarity test device according to claim 2, is characterized in that, described polarity test device also comprises communication component, and described communication component is connected for the input end receiving described switch on and off control signal with described controller.

4. polarity test device according to claim 3, is characterized in that, described communication component is wireless communication unit.

5. polarity test device according to claim 1, is characterized in that, described multiple primary side switch number is and the three-phase of line of electric force three one to one.

6. polarity test device according to claim 5, is characterized in that, described multiple secondary side switches number is and the three-phase of line of electric force three one to one.

7. polarity test device according to any one of claim 1 to 6, is characterized in that, described polarity test parts (3) comprise reometer.

8. polarity test device according to any one of claim 1 to 6, is characterized in that, described polarity test parts (3) comprise light emitting diode.