CN203432994U - Phase sequence conversion device of three-phase alternating current tester - Google Patents

Abstract

A phase sequence switching device for a three-phase AC tester, which includes an AC tester, the three-phase voltage or current output of the AC tester is connected to a switch with auxiliary contacts of different gears, the output of the switch Connected to the relay protection device; the output of the three-phase AC tester is fixed as the ABC phase sequence, and the switch switches the ABC phase sequence to include at least the CAB, BCA phase sequence and Connected to the relay protection device; it has high reliability, maintenance-free, wide application range, can realize the fast conversion of the phase sequence, greatly shortens the debugging time, improves the work efficiency, and is suitable for various three-phase AC test instruments The output has good versatility and other characteristics.

Description

Phase sequence conversion device of three-phase AC tester

technical field

The utility model relates to a device capable of converting the output three-phase AC voltage and current phase sequence of a testing instrument, which is applicable to the fields of power systems, automation and the like.

Background technique

At present, in order to achieve the purpose of simulating various actual faults during the debugging of relay protection devices in power systems, testers need to simulate faults for each phase or between phases of relay protection devices. However, for the same section of protection, the amount of faults between different phases or between phases is the same, and the testers must manually change the settings to achieve the purpose of changing the phase sequence; this method is inefficient and wastes a lot of time, and when the setting It is even more effective when things go wrong.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a phase sequence switching device for a three-phase AC tester that can greatly shorten the debugging time, improve the working efficiency of the debugging personnel, and can quickly switch the phase sequence.

The purpose of this utility model is accomplished through the following technical solutions, which includes an AC tester, the three-phase voltage or current output of the AC tester is connected to a switch with auxiliary contacts of different gears, the switch of the switch The output is connected to a protective relay.

The output of the three-phase AC tester is fixed as the A-B-C phase sequence, and the switching switch switches the A-B-C phase sequence to include at least the C-A-B and B-C-A phase sequences and is connected to the relay protection device after the auxiliary contacts of different gears are turned on and off.

Compared with the prior art, the utility model has the following characteristics:

1. The utility model adopts the traditional switching handle, which is simple to implement, high in reliability, free of maintenance, wide in application range, and can be used for switching of voltage and current.

2. The utility model can realize fast conversion of the phase sequence, greatly shortens the debugging time and improves the work efficiency.

3. The utility model is suitable for the output of various three-phase AC test instruments, and has good versatility.

Description of drawings

Fig. 1 is a schematic diagram of the application structure of the utility model.

Fig. 2 is a schematic circuit diagram of the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings: shown in Figures 1 and 2, the utility model includes an AC tester 1, and the three-phase voltage or current output of the AC tester 1 is connected to a The switch 2 of the auxiliary contact, the output of the switch 2 is connected to the relay protection device 3 .

The output of the three-phase AC tester 1 is fixed as the A-B-C phase sequence, and the switch 2 switches the A-B-C phase sequence to include at least the C-A-B, B-C-A phase sequence and connects to the relay protection device 3.

The utility model is realized by switching on and off the auxiliary contacts of different gear positions of the switch. The three-phase voltage or current output of the AC tester is connected to the switch, and the output of the switch is connected to the relay protection device. The different gears of the switch can realize the conversion of the phase sequence. The output of the three-phase AC tester is fixed in the order of A-B-C, and can be converted to C-A-B, B-C-A, etc. after switching. In this way, no matter which phase fault needs to be simulated by the relay protection device, it only needs to pass It's quick and easy with the flip of a switch.

Example

In this embodiment, taking the debugging of a set of 110kV line relay protection device as an example, the utility model and the non-adoption of the two methods are compared, and the use time is as follows:

The above example is based on the verification of the typical protection section fixed value. For the debugging of other complex functions of the protection device, such as voltage disconnection and overcurrent protection, distance and zero-sequence post-acceleration protection, etc., multiple state sequences are required to cooperate with the debugging. At this time The superiority of the phase sequence conversion device of the utility model in debugging can be fully reflected.

As shown in Figure 1, the phase sequence conversion device described in the utility model is connected to the tested equipment such as the three-phase AC tester and the relay protection device, and the three-phase voltage and current sequence output by the three-phase AC tester are fixed in the order of A-B-C, After the phase sequence conversion, the phase sequences felt by the relay protection device are: A-B-C (gear position 1), C-A-B (gear position 2), B-C-A (gear position 3). If the three-phase AC tester sets the fault phase to phase A, the fault phases felt by the relay protection device are: phase A (gear position 1), phase B (gear position 2), and phase C (gear position 3).

The circuit principle wiring diagram of the phase sequence conversion device of the utility model is shown in Fig. 2 . Through gear switching, the on-off of different auxiliary contacts can be realized, the switching between different phases can be realized, and finally the conversion of phase sequence can be realized.

Claims (2)

1. the phase-sequence changed device of a three-phase alternating current test instrument; it comprises an ac test instrument; the three-phase voltage or the electric current output that it is characterized in that described ac test instrument are connected in a change-over switch with different gear auxiliary contacts, and the output of this change-over switch is connected to protective relaying device.

2. the phase-sequence changed device of three-phase alternating current test instrument according to claim 1; it is characterized in that described three-phase alternating current test instrument output is fixed as A-B-C phase sequence; after the break-make of described change-over switch by different gear auxiliary contacts, A-B-C phase sequence is switched to and at least comprises C-A-B, B-C-A phase sequence and be connected to protective relaying device.

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