A rail potential limiting operation overvoltage suppression experimental verification device

Abstract

The utility model discloses an experimental verification device for overvoltage suppression of rail potential limiting operation, including an overvoltage suppression circuit, an autotransformer, a DC contactor, a rectifier bridge, a resistor, and an inductor. The overvoltage suppression circuit is connected in series with the DC contactor, the rectifier bridge, the resistor, and the inductor: wherein, overvoltage suppression devices of rail potential limiting devices are connected in parallel on both sides of the DC contactor. The utility model realizes the experiment of the suppression performance of the overvoltage suppression device of the rail potential limiting device in the laboratory by setting the overvoltage suppression circuit, the autotransformer, the DC contactor, the rectifier bridge, the resistor, and the inductor, quantitatively evaluates the suppression effect of the overvoltage suppression device of the rail potential limiting device, measures the recovery voltage and overvoltage size of the overvoltage suppression device of the rail potential limiter, and reduces the leakage of stray current in urban rail transit.

Description

Technical Field

[0001] The utility model relates to the technical field of rail potential limitation, in particular to a rail potential limitation operation overvoltage suppression experimental verification device. Background Art

[0002] Aiming at the problem that the 2nd and 3rd stage voltage protection of the rail potential limiting device often malfunctions during operation, the analysis based on the working principle of OVPD and measured data shows that the malfunction of OVPD is caused by the high-order oscillation circuit formed in the transient process of its operation, which generates an operating overvoltage.

[0003] In the urban rail transit power supply system, when the rail potential limiter is reset, the DC contactor cuts off the inductive current on the line rails. Due to the instability of the arc, it brings about a cut-off overvoltage. The operating overvoltage of the rail potential limiter reset will be transmitted to the nearby station through the rails and detected by the sensors of the rail potential limiters of other nearby stations, causing the OVPD II protection of nearby stations to frequently operate. For the personal safety of the station personnel, the rail potential limiter is eventually locked and grounded for a long time, causing a large amount of stray current to be injected into the earth through the rail potential limiter, causing the stray current corrosion of the urban rail transit system to intensify. In order to control the stray current problem of urban rail transit, installing an overvoltage suppression device on the rail potential limiter has become a future development trend.

[0004] There are many inconveniences in using the rail potential limiter at the station to conduct the cut-off overvoltage experiment. At present, there is no experimental device that can simulate the cut-off overvoltage of the rail potential limiter in the laboratory. Utility Model Content

[0005] Therefore, the purpose of the utility model is to provide a rail potential limiting operation overvoltage suppression experimental verification device. By setting up the overvoltage suppression circuit, autotransformer, DC contactor, rectifier bridge, resistor, and inductor, it is possible to conduct experiments on the suppression performance of the rail potential limiting device overvoltage suppression device in the laboratory, quantitatively evaluate the suppression effect of the rail potential limiting device overvoltage suppression device, measure the recovery voltage and overvoltage size of the rail potential limiter overvoltage suppression device, and reduce the leakage of stray current in urban rail transit.

[0006] To solve the above technical problems, according to one aspect of the utility model, the utility model provides the following technical solutions: a rail potential limiting operation overvoltage suppression experimental verification device, comprising an overvoltage suppression circuit, an autotransformer, a DC contactor, a rectifier bridge, a resistor, and an inductor, wherein the overvoltage suppression circuit is connected in series with the DC contactor, the rectifier bridge, the resistor, and the inductor:

[0007] Wherein, overvoltage suppression devices of rail potential limiting devices are connected in parallel on both sides of the DC contactor.

[0008] As a preferred solution of the rail potential limiting operation overvoltage suppression experimental verification device described in the utility model, a 380V AC power supply generates a DC current through an autotransformer and a three-phase rectifier bridge to simulate the DC current generated after the rail potential limiter is connected to the rail and the earth.

[0009] As a preferred solution of the rail potential limiting operation overvoltage suppression experimental verification device described in the utility model, wherein the resistor affects the recovery voltage after the DC contactor is disconnected, and the inductor simulates the rail inductance;

[0010] Among them, the resistance parameter is 1Ω and the inductance parameter is 5mH.

[0011] As a preferred solution of the rail potential limiting operation overvoltage suppression experimental verification device described in the utility model, the resistor affects the recovery voltage after the DC contactor is disconnected, and the inductor simulates the inductance of the rail.

[0012] As a preferred solution of a rail potential limiting operation overvoltage suppression experimental verification device described in the utility model, in the circuit, K1 is a DC contactor of the rail potential limiting device, and OSD-VLD is an operation overvoltage suppression circuit of the rail potential limiting device.

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] By setting up the overvoltage suppression circuit, autotransformer, DC contactor, rectifier bridge, resistor, and inductor, it is possible to carry out experiments on the suppression performance of the rail potential limiting device overvoltage suppression device in the laboratory, quantitatively evaluate the suppression effect of the rail potential limiting device overvoltage suppression device, measure the recovery voltage and overvoltage size of the rail potential limiter overvoltage suppression device, and reduce the leakage of stray current in urban rail transit.

[0015] In specific use, the AC power supply is connected to the autotransformer and the three-phase rectifier bridge to generate DC current, simulating the DC current generated after the rail potential limiter is connected to the rail and the earth. The resistance affects the recovery voltage after the DC contactor is disconnected. The inductance simulates the inductance of the rail, simulating the recovery voltage and operating overvoltage of the rail potential limiter. By measuring the recovery voltage and operating overvoltage of the DC contactor in this device, the performance of the overvoltage suppression device of the rail potential limiting device can be verified in the laboratory. During operation, 380V, AC power supply generates DC current through the autotransformer and the three-phase rectifier bridge. R affects the recovery voltage Udc after the DC contactor is disconnected, and L simulates the rail inductance, where the parameters are R=1Ω, L=5mH, close the DC contactor K1, adjust the autotransformer voltage, and adjust the DC side current to 100A. When the DC contactor K1 is disconnected, when the recovery voltage Udc is below 100V, the operating overvoltage does not exceed 150V. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation of the utility model, the utility model will be described in detail below in combination with the drawings and detailed implementation. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0017] Figure 1 This is a schematic diagram of the laboratory verification device of the utility model. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0020] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0021] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] The utility model provides a rail potential limiting operation overvoltage suppression experimental verification device. By arranging an overvoltage suppression circuit, an autotransformer, a DC contactor, a rectifier bridge, a resistor and an inductor, an experiment on the suppression performance of an overvoltage suppression device of a rail potential limiting device is carried out in a laboratory, the suppression effect of the overvoltage suppression device of the rail potential limiting device is quantitatively evaluated, the recovery voltage and the overvoltage size of the overvoltage suppression device of the rail potential limiter are measured, and the leakage of stray current in urban rail transit is reduced.

[0023] Figure 1 The utility model is a schematic diagram of the overall structure of a rail potential limiting operation overvoltage suppression test verification device of an embodiment, please refer to Figure 1 , a rail potential limiting operation overvoltage suppression experimental verification device of this embodiment includes an overvoltage suppression circuit, an autotransformer, a DC contactor, a rectifier bridge, a resistor, and an inductor. The overvoltage suppression circuit is connected in series with the DC contactor, the rectifier bridge, the resistor, and the inductor:

[0024] Wherein, an overvoltage suppression device of a rail potential limiting device is connected in parallel on both sides of the DC contactor;

[0025] During specific use, the AC power supply is connected to the autotransformer and the three-phase rectifier bridge to generate DC current, simulating the DC current generated after the rail potential limiter is connected to the rail and the earth. The resistance affects the recovery voltage after the DC contactor is disconnected. The inductance simulates the inductance of the rail, simulating the recovery voltage and operating overvoltage of the rail potential limiter. By measuring the recovery voltage and operating overvoltage of the DC contactor in this device, the performance of the overvoltage suppression device of the rail potential limiting device can be verified in the laboratory. During operation, 380V, AC power supply generates DC current through the autotransformer and the three-phase rectifier bridge. R affects the recovery voltage Udc after the DC contactor is disconnected, and L simulates the rail inductance, where the parameters are R=1Ω, L=5mH, close the DC contactor K1, adjust the autotransformer voltage, and adjust the DC side current to 100A. When the DC contactor K1 is disconnected, when the recovery voltage Udc is below 100V, the operating overvoltage does not exceed 150V.

[0026] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rail potential limiting operation overvoltage suppression experimental verification device, comprising an overvoltage suppression circuit, an autotransformer, a DC contactor, a rectifier bridge, a resistor, and an inductor, characterized in that: The overvoltage suppression circuit is connected in series with the DC contactor, the rectifier bridge, the resistor, and the inductor: Wherein, overvoltage suppression devices of rail potential limiting devices are connected in parallel on both sides of the DC contactor.

2. A rail potential limiting operation overvoltage suppression test verification device according to claim 1, characterized in that: The 380V AC power supply generates a DC current through an autotransformer and a three-phase rectifier bridge to simulate the DC current generated after the rail potential limiter connects the rail and the ground.

3. A rail potential limiting operation overvoltage suppression test verification device according to claim 2, characterized in that: The resistance affects the recovery voltage after the DC contactor is disconnected, and the inductance simulates the rail inductance; Among them, the resistance parameter is 1Ω and the inductance parameter is 5mH.

4. A rail potential limiting operation overvoltage suppression test verification device according to claim 3, characterized in that: The resistance affects the recovery voltage after the DC contactor is disconnected, and the inductance simulates the inductance of the rail.

5. The rail potential limiting operation overvoltage suppression test verification device according to claim 4 is characterized in that: In the circuit, K1 is the DC contactor of the rail potential limiting device, and OSD-VLD is the operating overvoltage suppression circuit of the rail potential limiting device.

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