Phase change-over switch based on harmonic current detection

Abstract

The utility model provides a phase change-over switch based on harmonic current detection, which comprises a three-phase electric plug work head and a multi-head jack type socket row which are electrically connected with each other, and is characterized in that the three-phase electric plug work head is provided with a special joint extension socket which can be connected with any single-phase live wire; the three-phase power supply plug work head is electrically connected with the multi-head jack type seat row and the extension socket, a power lead is connected to one multi-head jack type seat row by using the three-phase power supply plug work head, and a fixed zero line socket corresponds to an optional jack of an A / B / C phase live wire in three-phase power supply; and the other end is provided with an extension socket which is provided with a ground wire plug, a null line plug and a special joint which can be independently connected with a live wire of any single phase, and can be used for rapidly and conveniently detecting and comparing the measured value deviation value of each single phase to a sample in the existing three-phase harmonic current test system.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of harmonic current detection, and particularly relates to a phase switching switch based on harmonic current detection. BACKGROUND

[0002] Due to the large use of switching power supplies in electronic products, harmonic currents and harmonic current test systems can inject a large amount of harmonic currents into a power grid while improving the efficiency of the power supply, and due to the nonlinear power conversion, the harmonic currents not only interfere with other devices in the same power grid, but also overload the neutral line current of the power grid, affecting the power transmission capacity. In addition, the phase control of the power supply can also cause the effective value current of the power grid to change, resulting in fluctuations in the effective value voltage on the load side and causing the light of the lighting lamp to flicker. Harmonic testing mainly measures the harmonic currents injected into the power grid by the tested device when the device is working. In the harmonic measurement circuit, a phase switching switch based on harmonic current detection for quickly and conveniently detecting and comparing the measurement value deviation of each individual phase of the existing three-phase harmonic current test system to the sample is urgently needed. CONTENT OF THE INVENTION

[0003] The application provides a phase switching switch based on harmonic current detection for quickly and conveniently detecting and comparing the measurement value deviation of each individual phase of the existing three-phase harmonic current test system to the sample.

[0004] A phase switching switch based on harmonic current detection, comprising a three-phase electric plug head and a multi-head jack seat row which are electrically connected to each other, wherein a special plug row for connecting a zero line is arranged on the three-phase electric plug head, and the three-phase electric plug head, the multi-head jack seat row and the plug row are electrically connected.

[0005] The phase switching switch based on harmonic current detection as described above, wherein the three-phase electric plug head and the plug row can be connected to a single-phase device under test for comparison data.

[0006] The phase switching switch based on harmonic current detection as described above, wherein the multi-head jack seat row comprises a zero line socket and a plurality of jacks corresponding to A / B / C phase live wires in three-phase power supply arranged on the zero line socket.

[0007] Compared with the prior art, the application has the following beneficial effects:

[0008] The application provides a phase switching switch based on harmonic current detection. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced.

[0010] Figure 1 is a three-dimensional schematic view of the phase switching switch based on harmonic current detection. DETAILED DESCRIPTION

[0011] The utility model will be further described in connection with the drawings:

[0012] As Figure 1 shown, a phase switching switch based on harmonic current detection includes a three-phase plug head 1, a multi-head jack seat row 2, a row plug 3, a zero line socket 20, and a jack 21.

[0013] A phase switching switch based on harmonic current detection includes a three-phase plug head 1 and a multi-head jack seat row 2 that are electrically connected to each other. The three-phase plug head 1 is provided with a special plug row 3 for connecting a zero line. The three-phase plug head 1, the multi-head jack seat row 2, and the plug row 3 are electrically connected. A three-phase power plug head is used to connect a power lead to a multi-head jack seat row. A fixed zero line socket and optional jacks corresponding to A / B / C phase live wires in three-phase power supply are used. The other end is a row plug with a ground wire, a zero line plug, and a special joint that can be individually connected to any single phase live wire. It can be used to quickly and conveniently detect and compare the measurement value deviation of each single phase to the sample in the existing three-phase harmonic current test system. More preferably, the row plug can use a three-phase five-wire plug.

[0014] Preferably, the row plug 3 can be connected to a single-phase device under test for comparison data. By connecting a single-phase device under test for comparison data, each phase is tested and the difference between the comparison results is compared. The purpose of this technology is to quickly and conveniently detect and compare the measurement value deviation of each single phase to the sample in the existing three-phase harmonic current test system.

[0015] Preferably, the multi-head jack type socket row 2 comprises a zero line socket 20, and a plurality of jacks 21 corresponding to A / B / C phase live wires in the three-phase power supply on the zero line socket 20.

[0016] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A phase commutated switch based on harmonic current detection, characterized by: The utility model relates to a three-phase electric plug head (1) and a multi-head socket seat row (2) which are electrically connected to each other, wherein the three-phase electric plug head (1) is provided with a special socket row (3) for connecting a zero line, and the three-phase electric plug head (1), the multi-head socket seat row (2) and the socket row (3) are electrically connected.

2. The phase commutated switch based on harmonic current detection according to claim 1, characterized in that: The three-phase electric plug head (1) and the socket row (3) can be connected to a single-phase device to be tested for comparison data.

3. The phase commutated switch based on harmonic current detection according to claim 1, characterized in that: The multi-head socket seat row (2) comprises a zero line socket (20) and a plurality of sockets (21) corresponding to A / B / C phase live wires in three-phase power supply arranged on the zero line socket (20).

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