High-voltage switch equipment opening and closing loop current measuring device for testing

Abstract

The utility model discloses a high-voltage switch equipment opening and closing loop current measuring device for testing. The high-voltage switch equipment opening and closing loop current measuring device comprises a Hall sensor for sensing current change, a resistor for converting current change into voltage change, an output line, a power supply device for supplying power to the Hall sensor and the resistor, and a data processing device. According to the device, one Hall sensor and one data processing device are arranged, a connecting line on one side of a to-be-detected opening coil and one side of a to-be-detected closing coil penetrate through the primary side input end of the Hall sensor at the same time, detection of the performance of the opening coil and the performance of the closing coil under a direct-current power source or an alternating-current power source is considered, and measurement of various performance parameters is achieved; the structure is simple, the size is small, the anti-interference capability is strong, the current overload capability is good, and the manufacturing cost is greatly reduced; different performance parameters are displayed on one curve, so that the performance parameters such as opening time, breaking time, closing time, closing time and arcing time of the switch equipment can be conveniently and quantitatively calculated and analyzed; operation is simple, testing is simple, and accuracy is high.

Description

Technical Field

[0001] The utility model relates to a laboratory current detection device for measuring switch equipment, in particular to a current measuring device for a closing and opening circuit of a high-voltage switch equipment for testing. Background Art

[0002] In the power system, switch equipment is very important and irreplaceable equipment, and the stability and reliability of its performance directly affect the safe operation of the power system. The performance test of switch equipment includes using different operating power supplies such as the highest, rated, and lowest, and collecting the current size and duration of the opening and closing coils to quantitatively calculate the performance parameters of the switch equipment such as the opening time, breaking time, closing time, closing time, and arcing time. The opening and closing control power supplies of switch equipment often have AC and DC. Therefore, during the testing and production of switch equipment, the current measurement of the opening and closing coils needs to meet the collection of AC and DC currents at the same time. The current measurement device for the opening and closing coils of switch equipment is one of the special key equipment in the laboratory, which is used to record the corresponding coil current size and duration of the switch equipment during the opening and closing actions. At present, in the process of testing switchgear, domestic large-capacity laboratories use separate measurement and separate recording methods to collect the current of the opening and closing coils. Testing different performance parameters requires different measurement components and data acquisition channels. In addition, when the operating power supply is divided into AC and DC, it is also necessary to consider the switching problem of the AC current measurement circuit and the DC current measurement circuit, and test the current and voltage at the same time. The data acquisition lines are numerous and complex. Equipment manufacturers generally only measure the opening and closing time. Generally, the opening and closing time of the switchgear are read according to the opening and closing currents through the change of a break signal. The test performance is relatively single and cannot fully analyze the performance of switchgear. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to conveniently and accurately test the performance of high-voltage switch equipment and provide a current measuring device for the closing and opening circuit of high-voltage switch equipment for testing.

[0004] Technical solution: The utility model discloses a device for measuring the current of the opening and closing circuit of a high-voltage switchgear for testing, comprising a Hall sensor for sensing current changes, a resistor for converting current changes into voltage changes, an output line, a power supply device for supplying power to the Hall sensor and the resistor, and a data processing device; the Hall sensor is provided with one, the connecting lines on one side of the opening coil and the closing coil to be tested pass through the primary input end of the Hall sensor at the same time, the resistor is connected to the output end of the Hall sensor, one end of the output line is respectively connected to the two ends of the resistor, and the other end is connected to the data processing device.

[0005] Furthermore, the data processing device shares one channel, which simplifies the data detection and collection devices of the device and reduces the cost of the equipment. On this basis, the performance of the opening coil and the closing coil under DC power supply or AC power supply is detected at the same time, realizing the measurement of multiple performance parameters.

[0006] Furthermore, the Hall sensor is a non-contact current Hall sensor, the primary side and the secondary side of the non-contact current Hall sensor are insulated and isolated, and has the advantages of good linearity, wide-band response, strong anti-interference ability, good current overload capacity, and small size, which improves the reliability and accuracy of various performance parameter detection.

[0007] Furthermore, the power supply of the opening coil and the closing coil is an AC power supply or a DC power supply, so that the same detection device can test the performance parameters under different conditions.

[0008] Furthermore, the number of turns of the opening coil and the closing coil passing through the primary input end of the Hall sensor is set according to the transformation ratio of the Hall sensor, and the number of turns of the opening coil and the closing coil can be adjusted according to the volatility of the performance parameters of the high-voltage switchgear, thereby improving the measurement accuracy.

[0009] Furthermore, the data processing device also includes a data acquisition module and a data output module for collecting and comparing changes in voltage signals. The data acquisition module continuously collects and compares changes in the current of the opening coil and the closing coil. The data output module displays the numerical changes collected by the data acquisition module on the same curve, which is convenient for quantitative calculation, analysis and display of performance parameters such as the opening time, breaking time, closing time, closing time and arcing time of the switching equipment. It is easy to operate, simple to test and highly accurate.

[0010] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. It takes into account the detection of the performance of the opening coil and the closing coil under DC power supply or AC power supply, and realizes the measurement of various performance parameters; 2. The device is equipped with one Hall sensor and one data acquisition channel for testing, which has a simple structure, small size, strong anti-interference ability, good current overload capacity, and greatly reduces the production cost; 3. Different performance parameters are displayed on a curve, which is convenient for quantitative calculation, analysis and display of performance parameters such as the opening time, breaking time, closing time, closing time and arcing time of the switching equipment; 4. It is easy to operate, simple to test and high in accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the installation test of the utility model. DETAILED DESCRIPTION

[0013] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0014] like Figure 1 A current measuring device for the closing and opening circuit of a high-voltage switchgear for testing is shown, comprising a Hall sensor 1 for sensing current changes, a resistor 3 for converting current changes into voltage changes, an output line 4, a power supply device 2 for supplying power to the Hall sensor 1 and the resistor 3, and a data processing device; the resistor 3 is connected to the output end of the Hall sensor 1, one end of the output line 4 is respectively connected to the two ends of the resistor 3, and the other end is connected to the data processing device, the data processing device shares a channel, and the Hall sensor 1 is a non-contact current Hall sensor; the data processing device also includes a data acquisition module and a data output module for comparing voltage signal changes.

[0015] like Figure 2 As shown, a method for measuring the current of a high-voltage switchgear opening and closing circuit using the above device for testing includes the following steps:

[0016] (S1) Pass the connecting wires on one side of the opening coil 5 and the closing coil 6 through the primary input end of the non-contact current Hall sensor 1 at the same time, and adjust the number of turns of the opening coil 5 and the closing coil 6 according to the transformation ratio of the non-contact current Hall sensor 1;

[0017] (S2) adjusting the opening power supply 7 and the closing power supply 8 to provide different power supply signals such as maximum, rated, minimum or DC, AC, etc. to the opening coil 5 and the closing coil 6 respectively;

[0018] (S3) The data acquisition module continuously acquires and compares the current changes of the opening coil 5 and the closing coil 6. The data output module displays the value changes acquired by the data acquisition module on the same curve, and quantitatively calculates, analyzes and displays the performance parameters of the switchgear such as the opening time, breaking time, closing time, closing time and arcing time.

Claims

1. A device for measuring the current of a high-voltage switchgear opening and closing circuit for testing, comprising a Hall sensor (1) for sensing current changes, a resistor (3) for converting current changes into voltage changes, an output line (4), a power supply device (2) for supplying power to the Hall sensor (1) and the resistor (3), and a data processing device; characterized in that: The Hall sensor (1) is provided with a connection line on one side of the opening coil (5) and the closing coil (6) to be tested simultaneously pass through the primary input end of the Hall sensor (1), the resistor (3) is connected to the output end of the Hall sensor (1), one end of the output line (4) is respectively connected to the two ends of the resistor (3), and the other end is connected to the data processing device.

2. The device for measuring the current of the closing and opening circuit of the high-voltage switchgear for testing according to claim 1 is characterized in that: The data processing devices share one channel.

3. The device for measuring the current of the closing and opening circuit of the high-voltage switchgear for testing according to claim 1 is characterized in that: The Hall sensor (1) is a non-contact current Hall sensor.

4. The device for measuring the current of the closing and opening circuit of the high-voltage switchgear for testing according to claim 1 is characterized in that: The power supply of the opening coil and the closing coil is an AC power supply or a DC power supply.

5. The device for measuring the current of the closing and opening circuit of the high-voltage switchgear for testing according to claim 1, characterized in that: The number of turns of the opening coil and the closing coil passing through the primary input end of the Hall sensor (1) is set according to the transformation ratio of the Hall sensor (1).

6. The device for measuring the current of the closing and opening circuit of the high-voltage switchgear for testing according to claim 1, characterized in that: The data processing device also includes a data acquisition module and a data output module for acquiring and comparing voltage signal changes.

7. The device for measuring the current of the closing and opening circuit of the high-voltage switchgear for testing according to claim 6, characterized in that: The data output module displays the value changes collected by the data collection module on the same curve.

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