CN202119860U - Current transformer polarity testing box - Google Patents

Abstract

The utility model relates to a polarity test box for a current transformer. It consists of a box body, on which a row of secondary wiring terminals is assembled. Under the row of secondary wiring terminals, there is a row of special pointer meters for polarity testing correspondingly connected to the secondary wiring terminals. There is an adjustable resistor connected to the special pointer meter for polarity test under the special pointer meter for testing. There are three-phase primary terminals of A, B, and C on the box body. There are A, B, and C three-phase cut-off switches corresponding to the A, B, and C three-phase primary terminals. There are test buttons under the A, B, and C three-phase cut-off switches, and there is an A in the box. , B, C three-phase primary terminal, A, B, C three-phase cut-off switch and test button matching power supply. The utility model can realize simultaneous testing of three phases, without carrying test lines, materials, instruments and other equipment on site, and has a high degree of integration.

Description

A current transformer polarity test box

technical field

The utility model relates to a polarity test box for a current transformer.

Background technique

The traditional current transformer polarity test uses a dry battery, the external test line is connected to the primary side of the current transformer, the secondary side is connected to the pointer meter, and the polarity test is realized by manually clicking the positive and negative poles of the battery. The wiring of this test method is cumbersome and disorderly, the work site is chaotic, and the personnel are not concentrated. Manually click the positive and negative poles of the battery, which is easy to generate electric sparks, which will cause harm to the test personnel and reduce the service life of the battery and the pointer watch. Moreover, only one loop can be verified at a time, and one wiring can only be tested separately, which does not meet the requirements of on-site standardized work.

Utility model content

The purpose of this utility model is to provide a current transformer polarity test box, which can realize simultaneous testing of three phases, prevent damage to the special pointer meter for current transformer polarity testing by adjusting the adjustable resistance, and operate the current transformer through the test button Instant on and off, no need to carry test lines, materials, instruments and other equipment on site, with high integration, it can be connected to the primary side of the current transformer through a special insulating rod. The battery is rechargeable, sturdy and beautiful, easy to operate, and the phase change can be completed at the test box.

The technical scheme of the utility model is: the utility model comprises a box body, a row of secondary connecting terminals is assembled on the box body, and a row of polarity terminals correspondingly connected with the secondary connecting terminals is arranged under the row of secondary connecting terminals. Special pointer meter for testing, under a row of special pointer meters for polarity test, there is an adjustable resistance correspondingly connected to the special pointer meter for polarity test, and three-phase primary terminals of A, B, and C are arranged on the box body, and in A , B, C three-phase primary connection terminals are equipped with A, B, C three-phase phase-specific cut-off switches corresponding to A, B, C three-phase primary connection terminals, and A, B, C three-phase phase-specific cut-off switches are set There is a test button, and the box is equipped with A, B, C three-phase primary terminals, A, B, C three-phase phase cut-off switches and a power supply for the test button.

In the utility model, a wiring slot for placing wiring can be arranged on the box body. The power supply is a rechargeable device, and is externally connected with an external plug for external power supply.

The current transformer polarity test box can realize simultaneous testing of A, B, and C three phases, and prevent the special pointer meter of current transformer polarity test from being damaged by excessive current by adjusting the adjustable resistance. The primary terminal is connected to the primary side of the current transformer through the lead wire, and the secondary terminal is connected to the secondary coil of the current transformer through the lead wire. The current is momentarily switched on and off through the test button, and the current transformer secondary is verified by the positive and negative of the pointer meter. Correct polarity of wiring.

The beneficial effects of the utility model are: the utility model can realize simultaneous testing of three phases, prevent damage to the special pointer meter for polarity testing of the current transformer by adjusting the adjustable resistance, operate the current on and off instantaneously through the test button, and do not need to carry the test on site Wires, materials, instruments and other equipment are highly integrated and can be connected to the primary side of the current transformer through a special insulating rod. The battery is rechargeable, sturdy and beautiful, easy to operate, and the phase change can be completed at the test box.

Description of drawings

Fig. 1 is the front view of the current transformer polarity test box described in the embodiment of the present invention;

Fig. 2 is a schematic diagram of the wiring on the back of the polarity test box of the current transformer described in the embodiment of the present invention;

Fig. 3 is a schematic diagram of on-site wiring of the current transformer polarity test box described in the embodiment of the present invention.

In the figure, 1 is the test wire slot, 2 is the secondary terminal, 3 is the primary terminal, 4 is the special pointer meter for polarity test, 5 is the adjustable resistance, 6 is the cut-off switch for each phase, 7 is the test button, 8 is the power supply, and 9 is the external plug .

Detailed ways

As shown in the accompanying drawings 1 and 2, the utility model embodiment includes a box body 10, on which a row of secondary connection terminals 2 is assembled, and a row of secondary connection terminals 2 is provided with a box corresponding to the secondary connection terminal. A row of special pointer meters 4 for polarity testing is connected, and an adjustable resistor 5 correspondingly connected to the special pointer meter for polarity testing is arranged under the row of special pointer meters 4 for polarity testing, and A, B, C three-phase primary connection terminal 3, under the A, B, C three-phase primary connection terminal 3 is provided with A, B, C three-phase phase cut-off switch 6 corresponding to A, B, C three-phase primary connection terminal, in A There is a test button 7 under the three-phase cut-off switches of , B, and C, and the three-phase primary terminals of A, B, and C, the three-phase cut-off switches of A, B, and C, and the supporting power supply for the test buttons are arranged in the box. 8. In this embodiment, the power source 8 is a rechargeable battery, which is connected with an external plug 9 for an external power source. A wiring groove for placing wiring is arranged on the front front of the box body. The current transformer polarity test box can realize simultaneous testing of A, B, and C three phases, and prevent the special pointer meter of current transformer polarity test from being damaged by excessive current by adjusting the adjustable resistance. Label 3 is connected to the primary side of the current transformer through the lead wire, label 2 is connected to the secondary coil of the current transformer through the lead wire, and the current switch is operated by the test button of label 7, and the secondary wiring of the current transformer is verified by the positive and negative of the pointer meter polarity correctness.

When used in the field as shown in Figure 3, it is connected to the primary side of the current transformer through the primary terminal 3, and the corresponding phases are A phase, B phase, and C phase as shown in Figure 3 . The secondary wiring side of the current transformer is connected to the secondary terminal 2, and the corresponding phases are shown in the figure. The phase cut-off switch 6 is to cut off the battery 8 and the primary wiring. If the cut-off switch is turned on, the three phases A, B, and C are respectively connected to the positive and negative poles of the battery, and the test button 7 is used to realize the function of testing the polarity of the three phases at the same time. The wiring on the secondary side of the current transformer is connected to the secondary terminal 2 of the new current transformer polarity test box, and the secondary terminal 2 is connected to the adjustable resistor 5 and the special pointer meter 4 through its internal wiring. During the on-off process of the test button 7, the pointer meter 4 will be turned up or down, so as to realize the polarity test of the current transformer. The instantaneous current is controlled by adjusting the adjustable resistor 5 to prevent the pointer meter from being burnt due to excessive current.

Claims (3)

1. current transformer polarity test case; It is characterized in that: comprise a casing; On casing, be equipped with row's secondary connection terminal; Have the corresponding row's polarity test dedicated pointer table that connects at row's secondary connection terminal with the secondary connection terminal; Be arranged with the adjustable resistance with the corresponding connection of polarity test dedicated pointer table at row's polarity test dedicated pointer table, casing is provided with A, B, C three-phase primary connection terminal, has the separate cut-out switch of A, B, C three-phase of corresponding A, B, C three-phase primary connection terminal at A, B, C three-phase primary connection terminal; Have test button at A, B, the separate cut-out switch of C three-phase, in casing, be provided with A, B, C three-phase primary connection terminal, A, B, the separate cut-out switch of C three-phase and the supporting power supply of test button.

2. a kind of current transformer polarity test case according to claim 1 is characterized in that: on casing, be provided with and be used for placing the connecting groove of wiring.

3. a kind of current transformer polarity test case according to claim 1, it is characterized in that: said power supply is a rechargeable devices, and is connected to the external plug that is used for external power supply.

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