CN203535165U - Portable current transformer polarity tester - Google Patents

Abstract

The utility model discloses a portable current transformer polarity tester, which comprises an outer casing, a DC power supply E, primary connection terminals P1, P2, secondary connection terminals P1*, P2*, and is characterized in that the secondary connection terminal P1 A pointer ammeter or voltmeter A is provided in the voltage circuit of * and P2*, and the pointer ammeter or voltmeter A is a two-way pointer type, that is, a two-way pointer ammeter or voltmeter that can indicate the direction of current or the polarity of voltage , Between the DC power supply E and the primary terminals P1 and P2, a dual polarity switching device ZK is provided, and the dual polarity switching device ZK is a switching switch with 4 pairs of contact points. Compared with the prior art, the utility model can test the polarity of the current transformer through a simple device, and the operation is very simple, and the polarity can be displayed accurately and visually.

Description

Portable Current Transformer Polarity Tester

technical field

The utility model relates to a test tool, in particular to a portable current transformer polarity tester.

It belongs to the polarity test of current transformers in substations, factories and mines, especially related to the polarity test of current transformers in high-voltage systems.

Background technique

The current transformer is an important electrical equipment in the power system. It is responsible for the isolation between high and low voltage systems and the conversion of high voltage to low voltage.

In actual use, if the polarity and wiring of the current transformer are incorrect, it will cause the protection device to malfunction or refuse to operate, and seriously cause an accident.

When installing a new current transformer and replacing the secondary cable of the current transformer, using the polarity test method to check the correctness of the current transformer wiring is already an indispensable work procedure for relay protection personnel.

The existing transformer comprehensive tester has the function of testing the polarity of the current transformer, but it can only test the polarity of the current winding of the current transformer body, and cannot be equipped with an external secondary circuit, and cannot determine the correctness of the polarity of the entire system.

The existing test method is: three people are needed, one person uses dry batteries in series at the current transformer body to manually control the positive and negative point operation, one person uses the walkie-talkie to contact the indoor personnel, and the indoor personnel use the pointer universal transformer to test the poles of each current winding. sex. Hidden dangers of this test method: 1. The human control factor is relatively strong, which is easy to cause misoperation; 2. The test equipment is scattered, the operation is unreliable, and does not meet the requirements of safe production; 3. The test time is long and the test personnel are many.

The current transformer polarity testing devices disclosed in CN201548652U and CN202421408U can test the polarity of the current transformer through a simple device, but its operation is still relatively troublesome, and only one state can be displayed, which is not intuitive enough.

Contents of the invention

The purpose of the utility model is to provide a portable current transformer polarity tester with simpler and more convenient operation and intuitive display.

The purpose of this utility model is achieved by the following structure: including the outer casing, DC power supply E, primary terminal P1, P2, secondary terminal P1*, P2*, characterized in that: secondary terminal P1*, P2* A pointer ammeter or voltmeter A is provided in the voltage circuit of the device, and the pointer ammeter or voltmeter A is a two-way pointer, that is, a two-way pointer ammeter or voltmeter that can indicate the direction of current or the polarity of voltage. There is a double-connected polarity switching device ZK between E and the primary terminals P1 and P2, and the double-connected polarity switching device ZK is a switching switch with 4 pairs of contact points.

As an improvement, the above-mentioned primary connection terminals P1, P2 and secondary connection terminals P1*, P2* are preferably provided with wire clamps (8), so as to make it easier and faster to connect the current transformer during testing.

Compared with the prior art, the utility model can test the polarity of the current transformer through a simple device, and the operation is very simple, and the polarity can be displayed accurately and visually.

Description of drawings

Fig. 1 is the circuit diagram of the utility model embodiment 1.

Fig. 2 is a schematic structural view of Embodiment 1 of the present utility model.

Fig. 3 is a circuit diagram of Embodiment 2 of the present utility model.

Fig. 4 is a schematic structural view of Embodiment 3 of the present utility model.

As shown in the figure: A is an ammeter or voltmeter, D is an indicator light, E is a DC power supply, K is a power switch, P1, P2, P1*, P2* are wiring terminals, TA is a current transformer, ZK is a double Polarity switching device.

1 is a connection terminal, 2 is an indicator light, 3 is an ammeter or a voltmeter A, 4 is a power supply opening, 5 is a double-connected polarity conversion device, 6 is a handle, 7 is an outer shell, and 8 is a wire clip.

Detailed ways

Embodiment 1: Referring to Fig. 1, Fig. 2 is a structural schematic diagram of Embodiment 1 of the present utility model, including an outer casing 8, a DC power supply E, primary terminals P1, P2, secondary terminals P1*, P2*, the above-mentioned terminal P1, P2, P1*, P2* use nut rotating terminals, and the voltage loops of secondary terminals P1*, P2* are equipped with pointer ammeters, and the pointer ammeters are bidirectional pointers, which can indicate the direction of current , between the DC power supply E and the primary terminals P1, P2 is provided with a double-connected polarity switching device ZK, and the double-connected polarity switching device ZK is a rotary switch with 4 pairs of contact points, through the rotary switch The turning handle realizes the polarity conversion of terminals P1 and P2.

Embodiment 2: Referring to FIG. 3, it is a circuit diagram of Embodiment 2 of the present invention. Compared with Embodiment 1, the difference of this embodiment is that the dual polarity conversion device ZK is a device with 4 pairs of contact points. The slide-push transfer switch realizes the polarity conversion of the terminals P1 and P2 once by pushing the slider.

Embodiment 3: Referring to FIG. 4, it is a structural schematic diagram of Embodiment 3 of the present utility model. Compared with Embodiment 2, the difference of this embodiment is that: the primary connection terminals P1, P2 and the secondary connection terminals P1*, There is a wire clamp 8 on P2* to make it easier and quicker to connect the current transformer during the test.

Embodiment 4: Compared with Embodiment 1, the difference of this embodiment is that: the primary connection terminals P1, P2 and the secondary connection terminals P1*, P2* are provided with wire clips 8, so that when testing Connecting current transformers is easier and faster.

Claims (2)

1. a low voltage drawing-out switching carbinet avoiding misinsertion drawer, comprise shell body, direct supply E, primary connection terminals P 1, P2, secondary wiring terminals P1*, P2*, it is characterized in that: secondary wiring terminals P1*, in the voltage circuit of P2*, be provided with indicator type current meter or voltage table A, and described indicator type current meter or voltage table A are two direction pointer type, can indicator current direction or two direction pointer type reometer or the voltage table of polarity of voltage, in direct supply E and primary connection terminals P 1, between P2, be provided with duplex polar converter ZK, and described duplex polar converter ZK is the switch with 4 butt contacts.

2. low voltage drawing-out switching carbinet avoiding misinsertion drawer according to claim 1, is characterized in that: described primary connection terminals P 1, P2 and secondary wiring terminals P1*, P2* are provided with wire clamp (8), so that it is more simple and efficient to connect current transformer during test.

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