A circuit breaker closing resistance energy absorption withstand test method and test device based on a double exponential inrush current wave

Abstract

The application discloses a circuit breaker closing resistance energy absorption resistance test method and test device based on a double exponential impulse current wave; the test device comprises a controllable high-voltage direct-current charging power supply, a double exponential impulse current generating unit, a closing resistance load and a computer measurement and control management system; based on transient analysis of an impulse current discharge loop, a correlation rule between energy absorbed by the closing resistance of the circuit breaker and the load resistance and loop parameters is obtained, a loop parameter design method suitable for closing energy resistance tests of different resistance values and different volume energy densities is established, and on this basis, the test device for the closing resistance energy absorption resistance of the circuit breaker is established, so that the problem that the existing high-voltage laboratory cannot perform energy absorption resistance tests on resistive closing resistances is solved, and standardized test technology for the operation safety of the circuit breaker and the power system is provided.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering technology, to ultra-high voltage equipment, and particularly to a method and apparatus for energy absorption withstand test of circuit breaker closing resistor based on double exponential impulse current wave. Background Technology

[0002] With the development of ultra-high voltage power transmission technology in my country, closing resistors are widely used in 330kV and above transmission lines to limit overvoltages generated during the opening and closing of high voltage circuit breakers and suppress arc reignition. They are the core protection for the development of ultra-high voltage and extra-high voltage power transmission and transformation equipment.

[0003] For the energy withstand test of surge arrester resistors, square wave currents with peak durations of 1ms to 3.2ms and different peak current values ​​are typically used. However, for the closing resistor of a circuit breaker, since the closing resistor is a linear resistor, using an impulse square wave current similar to that of the surge arrester resistor for testing would present the following problems: 1) The energy withstand capability of the closing resistor is mainly for the energy absorption of the circuit breaker at the moment of closing. The working time is generally based on the power frequency half-wave, and the duration can be between 8-11ms. However, for a well-designed inductor-capacitor LC square wave current chain, adjusting the duration is more complicated.

[0004] 2) The closing resistor is a linear resistor, and the resistance value of the closing resistor is different, making it difficult to form an impedance match with the impulse square wave circuit to generate a square wave.

[0005] If the square wave current loop is designed based on a closing resistor with a large resistance value, it will result in an excessively high operating voltage of the square wave current system, which may exceed the lightning withstand voltage or the operating withstand voltage of the closing resistor. When encountering a closing resistor with a small resistance value, one approach is to add a matching resistor in the circuit. However, this results in a significant energy loss due to the square wave current in the matching resistor. Another approach is to not add a matching resistor, which causes the reverse polarity current of the square wave to fail to extinguish, resulting in a certain energy density increase during the 8-11ms duration, which is difficult to control.

[0006] Therefore, the design of the test circuit for the energy absorption of circuit breaker closing resistor, the research on test technology, and the development of test equipment can promote the research on the formulation and process of carbon-ceramic linear closing resistors, accelerate their application in ultra-high voltage power transmission systems, and formulate test standards for circuit breaker closing resistors. All of these have important theoretical significance and engineering application value. Summary of the Invention

[0007] In view of the current situation that the LC chain square wave forming circuit cannot adapt to the energy absorption capacity of the closing resistor, the purpose of this invention is to provide a test method and test device for the energy absorption tolerance test of the circuit breaker closing resistor based on the double exponential impulse current wave, establish a test device for the energy absorption tolerance test of the circuit breaker closing resistor, and propose a control method for the energy absorption tolerance test of the circuit breaker closing resistor.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A circuit breaker closing resistor energy absorption withstand test device based on double exponential impulse current wave includes a controllable high voltage DC charging power supply, a double exponential impulse current generating unit, a closing resistor load, and a computer measurement and control management system. The controllable high-voltage DC charging power supply consists of a high-voltage DC charging power supply and a DC voltage divider. Its function is to charge the energy storage element of the double-exponential impulse current generating unit in the energy absorption test. The double-exponential impulse current generating unit includes an energy storage capacitor C, a discharge switch G, a waveform forming inductor L, and a protective resistor. R p and closing resistor R The function of z is to generate an energy absorption waveform that meets the standard requirements and apply it across the closing resistor load. The closing resistor load is the closing resistor Zr. The double-exponential impulse current generating unit is connected to the closing resistor Zr to form an energy absorption withstand voltage generation circuit. Through the analysis of the transient process of the energy absorption withstand voltage generation circuit, the closing resistor within 8-11ms is obtained. R z absorbs the impact energy and the closing resistance. R The relationship between the resistance value of z and the circuit parameters; The computer-based measurement and control management system is used to extract and record the energy absorption applied across the closing resistor Zr, thereby enabling control of the closing resistor energy absorption withstand voltage test and data processing of energy absorption.

[0009] Furthermore, the energy storage capacitor in the energy absorption withstand voltage generation circuit C The high-voltage terminal of the discharge switch G is electrically connected to the high-voltage terminal of the discharge switch G, and the low-voltage terminal of the discharge switch G is connected to the waveform adjustment inductor. L Electrical connection at the high-voltage end, waveform adjustment inductor L Low voltage terminal and protection resistor R p Electrical connection at the high-voltage end, protective resistor R p The other end is connected to the closing resistor R One end of z is electrically connected; closing resistor R The other end of z is connected to the energy storage capacitor. C The low-voltage electrical connection.

[0010] Furthermore, the computer-based measurement and control management system includes a pulse voltage divider, a pulse current sensor, an oscilloscope, a control unit, and a computer; The energy absorption applied across the closing resistor is extracted and recorded by a pulse voltage divider, a pulse current sensor, and an oscilloscope. The control of the closing resistor energy absorption withstand voltage test and the data processing of energy absorption are realized through data communication between the computer and the oscilloscope. The computer automatically judges the result of the closing resistor Zr energy absorption test and gives the judgment result based on the voltage and current signal characteristics extracted by the pulse voltage divider and the pulse current sensor and acquired by the oscilloscope.

[0011] Furthermore, the control unit mainly consists of a charging voltage monitoring circuit and a programmable controller. The charging voltage monitoring circuit automatically monitors the charging process of the closing resistor energy absorption test; the programmable controller, in conjunction with a computer, automatically controls the process of the closing resistor energy absorption withstand test.

[0012] Furthermore, the charging voltage of the controllable high-voltage DC charging power supply is set through the human-machine interface, or controlled through the charging voltage monitoring circuit via communication between the computer measurement and control management system and the controllable high-voltage DC charging power supply.

[0013] Furthermore, the energy storage capacitor C and the waveform forming inductor L are high-voltage components that can be discretely adjusted.

[0014] The method for withstanding the energy absorption of circuit breaker closing resistors under double exponential impulse current surges includes the following steps: (1) Computer measurement and control management system for energy absorption and withstand test of double exponential impulse current wave energy of opening closing resistor; (2) In the closing resistor R The human-machine interface for the energy absorption withstand test allows setting information and test parameters for the closing resistor energy absorption withstand test. (3) Operating closing resistor Z r-energy absorption tolerance test monitoring and management software; (4) The computer-controlled measurement and control management system automatically controls the energy storage capacitor of the controllable high-voltage DC charging power supply to the double-exponential impulse current generating unit. C The charging process is monitored, and the energy storage capacitor is automatically tracked by the DC voltage divider of the controllable high-voltage DC charging power supply. C The real-time state of the charging voltage at both ends, when the energy storage capacitor... C When the charging voltage at both ends reaches the preset test conditions, the control unit sends a discharge pulse, causing the discharge switch G of the double exponential inrush current generating unit to break down and conduct. The generated inrush current then flows through the closing resistor. R Impact energy absorption is formed on z; (5) The computer measurement and control management system extracts and records pulse voltage dividers, pulse current sensors and oscilloscopes, and processes and analyzes the impact energy absorbed by the closing resistor through data transmission between the computer and the oscilloscope; (6) When applied to the closing resistor R When the current or voltage waveform across terminals z is distorted, the computer-controlled measurement and management system automatically provides the closing resistor. R The system uses control criteria to determine if surface flashover or explosion occurs, displays and stores test data and waveforms, and stops the closing resistor. R z Energy absorption tolerance test.

[0015] This invention presents a method and apparatus for testing the energy absorption withstand capability of circuit breaker closing resistors based on double-exponential impulse current waves. Based on transient analysis of the impulse current discharge circuit, it obtains the correlation between the energy absorbed by the circuit breaker closing resistor and the load resistance and circuit parameters, establishing a method for designing generation circuit parameters suitable for closing energy withstand tests with different resistance values ​​and volume energy densities. On this basis, a test apparatus for the energy absorption withstand capability of circuit breaker closing resistors is established, and a control method for the test is proposed. This solves the problem that existing high-voltage laboratories cannot perform energy absorption withstand tests on resistive closing resistors, providing standardized testing technology for the operational safety of circuit breakers and power systems. The test method and system for the energy absorption withstand capability of circuit breaker closing resistors in this invention can be used in similar scenarios such as resistive load energy withstand voltage tests in the power and communication fields.

[0016] This invention proposes a circuit with extremely low characteristic impedance that relies primarily on the closing resistor to operate in an overdamped state for energy absorption withstand voltage generation. This avoids surface flashover caused by excessively high discharge voltage or voltage across the closing resistor, and generates a double exponential wave impulse current with a duration greater than 8-11 ms. Through theoretical analysis of the correlation between the transient voltage waveform across the closing resistor and the circuit parameters, design principles for circuit parameters for energy absorption withstand tests of closing resistors with different resistance values ​​and volume energy densities are obtained. By implementing and controlling discretely adjustable components such as energy storage capacitors, discharge switches, waveform adjustment inductors, and resistors, the requirements for energy absorption tests of closing resistors with different resistance values ​​and volume energy densities can be met.

[0017] To prevent surface flashover or rupture of the closing resistor from interfering with and damaging the energy storage capacitor, measurement system, and computer management system, protective measures are installed in the double-exponential energy absorption withstand voltage generation circuit to prevent surface flashover or explosion of the closing resistor. This avoids damage caused by overcurrent in the double-exponential energy absorption withstand voltage generation circuit and the measurement and control system, or by the inability to release stored energy, or operational accidents of the closing resistor energy absorption withstand test system. Attached Figure Description

[0018] Figure 1 This invention relates to an energy absorption withstand voltage generation circuit for a circuit breaker closing resistor energy absorption withstand test. Figure 2 This is a waveform diagram of the test voltage and current flowing through the closing resistor during the energy absorption withstand voltage test of the closing resistor of the present invention. Figure 3 This is a schematic diagram of the energy absorbed and remaining energy within a specified time during an energy absorption withstand test of the closing resistor of a circuit breaker according to the present invention. Figure 4 This is a structural block diagram of the energy absorption withstand test device for closing resistors of circuit breakers according to the present invention; Figure 5 This is a flowchart of the measurement and control process for the energy absorption withstand test of the closing resistor for a circuit breaker according to the present invention. In the diagram: 1-Controllable high-voltage DC charging power supply, 1-1-High-voltage DC charging power supply, 1-2-DC voltage divider, 2-Double exponential impulse current generating unit, 3-Closing resistor load, 4-Computer measurement and control management system, 5-Pulse voltage divider, 6-Pulse current sensor, 7-Oscilloscope, 8-Control unit, 8-1-Charging voltage monitoring circuit, 8-2-Programmable controller, 9-Computer. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0020] See Figure 1 This invention discloses a double-exponential energy absorption withstand voltage generating circuit for the energy absorption withstand test of the closing resistor of a circuit breaker, mainly composed of an energy storage capacitor. C Waveform forming inductance L and protective resistor R p and closing resistor R The z-composition is based on the transient process of the energy absorption withstand voltage generation circuit, which yields the closing resistance within 8-11ms. R z absorbs the impact energy and the closing resistance. R The relationship between the resistance value of z and the circuit parameters.

[0021] Electrical connections of the energy absorption withstand voltage generation circuit: Energy storage capacitor C The high-voltage terminal of the discharge switch G is electrically connected to the high-voltage terminal of the discharge switch G, and the low-voltage terminal of the discharge switch G is connected to the waveform adjustment inductor. L Electrical connection at the high-voltage end, waveform adjustment inductor L Low voltage terminal and protection resistorR p Electrical connection at the high-voltage end, protective resistor R p The other end is connected to the closing resistor R One end of z is electrically connected; closing resistor R The other end of z is connected to the energy storage capacitor. C The low-voltage electrical connection.

[0022] The principle of the energy absorption withstand voltage generation circuit is to utilize a charged energy storage capacitor. C When the discharge switch G is turned on, an inductance is instantaneously formed through the waveform. L and protective resistor R p For closing resistor R z is released, thus in the closing resistor R The absorbed energy in z is generated to meet the energy density requirements of the closing resistor.

[0023] Unlike traditional high-voltage testing techniques that test the impulse current or impulse energy of nonlinear loads such as surge arresters or surge arrester resistors, the closing resistor of a circuit breaker is a linear resistor. The voltage across it increases with the increase of the peak impulse current. Therefore, the energy absorption test of the closing resistor must be carried out under the condition that the withstand voltage across the closing resistor does not exceed a certain limit. In particular, the voltage across the resistor during the energy absorption test must not exceed its lightning impulse withstand voltage or energy absorption withstand voltage. The maximum value of the discharge voltage should correspond to the peak value of the power frequency rated voltage of the closing resistor. Otherwise, surface flashover breakdown of the closing resistor may occur.

[0024] The double-exponential energy absorption withstand voltage generation circuit of the closing resistor adopts a mesh circuit composed of capacitors, inductors, and resistors. Through circuit analysis of the impulse discharge process, a mathematical expression of the correlation between the voltage and current flowing through the closing resistor and the circuit parameters and load resistance can be obtained. This allows for the calculation of the energy absorbed by the closing resistor within the specified time of 8-11 ms in the power frequency half-wave, providing a theoretical basis for establishing double-exponential energy absorption withstand voltage generation circuits with different load resistances and determining the test method.

[0025] Closing resistor R Circuit analysis for energy absorption in z: Closing resistor R The energy absorbed by the slewing resistor is obtained by integrating the current flowing through it and the voltage across its terminals over the 8-11 ms duration of the impulse current. Therefore, before calculating the energy absorbed by the closing resistor, it is necessary to obtain the analytical expression for the impulse current flowing through the closing resistor.

[0026] for Figure 1 The energy absorption withstand voltage generation circuit shown is configured as follows: ,get Figure 1 The differential equation of the circuit shown is: (1) Solving equation (1) yields the characteristic roots of equation (1): (2) Therefore, the solution to equation (1) (the current in the impact discharge circuit) is: (3) Based on the initial conditions of the impulse discharge circuit: (4) The coefficients in equation (3) can be obtained as follows: (5) Therefore, the current in the impulse discharge circuit is: (6) Under overdamped conditions, the expression for the double-exponential current generated by the impulse current discharge circuit 2 is: (7) Then it acts on the closing resistor R The voltage expression across z is: (8) In the formula, , This is the charging / discharging voltage across the energy storage capacitor in the double-exponential impulse current generating unit 2. Next, according to expressions (7) and (8), the voltage acting on the closing resistor can be calculated numerically. R The impact energy at z is: (9) Based on the structural dimensions and volumetric energy density of the closing resistor, as well as formula (7) or formula (8), the duration of the 10%-10% peak time of the current flowing through the closing resistor or the time from the apparent origin to the current dropping to 10-50% can be calculated, which is not less than 8-11 ms.

[0027] There are no international electrotechnical commission or national standards to refer to for the waveform parameters of energy absorption. In other words, the waveform parameters of the inrush current loop output by the closing resistor energy absorption do not specify the rise time, but the duration must meet the parameter requirement of greater than 8-11ms.

[0028] Based on the resistance value of the closing resistor and the energy calculation formula (9), the parameters of each component in the energy absorption withstand voltage generation circuit that satisfy the given closing resistor resistance value and energy density can be obtained. However, since the resistance value of the closing resistor cannot remain exactly constant during the duration of the impact current, that is, the closing resistor is not a time-invariant linear resistor, the accurate energy calculation also needs to be obtained by integrating the product of the actual impact current flowing through the closing resistor and the voltage across it over time.

[0029] See Figure 2 The waveform of the current flowing through the closing resistor when it is not damaged. In the energy withstand test, the volumetric energy density that the closing resistor is required to withstand within 8-11 ms can be calculated based on the current flowing through it and its resistance value. Since the double exponential wave current theoretically only decays to zero when the time approaches infinity, the current flowing through the closing resistor does not decay to zero at 8 ms or 11 ms. Therefore, the current is divided into the effective calculated current (the effective time region I for calculating the energy absorbed by the closing resistor within the specified time) and the residual current (the current region II not considered in the calculation of the energy absorbed by the closing resistor within the specified time). If a surface flashover breakdown occurs in the closing resistor during the energy absorption withstand voltage test of the circuit breaker, a large impulse voltage will flow through the double exponential energy absorption withstand voltage generation circuit.

[0030] See Figure 3 The voltage waveform and current waveform flowing through the closing resistor when the sample is damaged (body breakdown or surface flashover discharge) during the energy absorption test. Figure 3 It can be seen that the closing resistor may experience surface flashover breakdown near the peak of the impulse current waveform, or at the wavefront or tail of the impulse current. In this case, a very large impulse current will flow through the impulse current loop, which brings more considerations to the selection of parameters of components in the energy absorption loop.

[0031] Energy storage capacitors not only need to have a high withstand voltage, the rated value of which is determined by the maximum discharge voltage of the energy absorption test of the tested closing resistor element or proportional unit, but also need to withstand nearly 100% reverse polarity current. This is especially important to consider when selecting dry-type metallized film capacitors with poor reverse polarity withstand performance.

[0032] To limit the peak current in the energy absorption withstand voltage generation circuit when the closing resistor experiences surface flashover breakdown, a protective resistor is added to the energy absorption withstand voltage generation circuit in the energy absorption withstand test. R pThe circuit design effectively prevents the energy absorption withstand voltage generation circuit from evolving into a deeply underdamped oscillating circuit when the closing resistor undergoes surface flashover breakdown, thus avoiding high-voltage test accidents.

[0033] See Figure 4 The present invention discloses a method and apparatus for energy absorption withstand test of closing resistor for circuit breaker. The energy absorption withstand test apparatus for closing resistor of circuit breaker mainly consists of a controllable high voltage DC charging power supply 1, a double exponential impulse current generating unit 2, a closing resistor load 3, and a computer measurement and control management system 4.

[0034] The controllable high-voltage DC charging power supply 1 mainly consists of a high-voltage DC charging power supply 1-1 and a DC voltage divider 1-2. Its function is to charge the energy storage element of the double-exponential impulse current generating unit 2 in the energy absorption test. Its charging voltage can be set on its own human-machine interface, or it can be realized through the communication control and DC high-voltage charging monitoring unit between the computer measurement and control management system 4 and the controllable high-voltage DC charging power supply 1.

[0035] The dual-exponential impulse current generating unit 2 mainly includes an energy storage capacitor C, a discharge switch G, a waveform forming inductor L, and a protective resistor. R p and closing resistor R The system consists of components, the main feature of which is that the energy storage capacitor C and the waveform forming inductor L are discretely adjustable high-voltage components to meet the energy absorption withstand test requirements of closing resistors with different resistance values. The main function of the double exponential impulse current generating unit 2 is to generate an energy absorption waveform that meets the standard requirements. The energy storage capacitor of the double exponential impulse current generating unit 2 is charged by the controllable high-voltage DC charging power supply 1; then, the electrical energy stored in the energy storage capacitor is discharged through the waveform forming inductor and waveform forming resistor to the closing resistor during the conduction of the discharge switch, and the resulting energy absorption is applied to both ends of the load.

[0036] The computer-controlled measurement and management system 4 mainly consists of a pulse voltage divider 5, a pulse current sensor 6, an oscilloscope 7, a control unit 8, and a computer 9. The energy absorption applied across the closing resistor is extracted and recorded by the pulse voltage divider, pulse current sensor, and oscilloscope. Data communication between the computer and the oscilloscope enables control of the closing resistor energy absorption withstand voltage test and data processing of the energy absorption (integration of the voltage across the resistor and the current flowing through it over time). The system can automatically determine the results of the closing resistor Zr energy absorption test and provide a judgment criterion based on the characteristics of the voltage and current signals extracted by the pulse voltage divider and pulse current sensor and acquired by the oscilloscope.

[0037] The measurement and control management of the closing resistor energy absorption withstand test is carried out by a computer measurement and control management system. The system controls the process of the energy absorption withstand test, as well as analyzes, processes and manages the test data and waveforms. Through the extraction of pulse voltage dividers and pulse current sensors, the acquisition of data by oscilloscopes and the analysis of computer management software, the process control of the closing resistor Zr energy absorption test can be realized, and the test criteria and the withstand value of the absorbed energy that the closing resistor can withstand can be given.

[0038] The control unit 8 mainly consists of a charging voltage monitoring circuit 8-1 and a programmable controller 8-2. The main functions of the computer measurement and control management system 4 include: ① automatically monitoring the charging process of the closing resistor energy absorption test; ② cooperating with the computer to automatically control the process of the closing resistor energy absorption withstand test; ③ realizing the analysis and judgment of the closing resistor energy absorption withstand test results; ④ extracting, recording, storing, querying and outputting test reports of the closing resistor impulse withstand voltage test signal.

[0039] Therefore, it can be concluded that the circuit breaker closing resistor energy absorption withstand test device includes multiple functions such as high voltage charging, discharging, measurement and management, and can perform type tests and sampling tests on the closing resistor for energy absorption withstand voltage.

[0040] See Figure 5 The present invention discloses a method for energy absorption withstand test of closing resistor for circuit breakers, and the measurement and control process is as follows: (1) The computer measurement and control management system for the energy absorption and withstand energy test of the double exponential impulse current wave of the starting closing resistor includes the power supply for turning on the control unit oscilloscope 7, control unit 8 and computer 9, and also includes the power supply for turning on the controllable high voltage DC charging power supply 1 and the double exponential impulse current generating unit 2.

[0041] (2) In the closing resistor R The human-machine interface for the energy absorption withstand test is used to set information and test parameters for the closing resistor energy absorption withstand test, including but not limited to: 1) Set the test environment information, including date, temperature, humidity, test personnel, etc.

[0042] 2) Set the product information of the tested closing resistor, which may include production batch, specifications, etc.

[0043] 3) Based on the tested closing resistance R Choose or prepare a suitable test circuit based on the resistance value of z.

[0044] 4) Set the mode of the energy absorption test, including the number of discharges in the energy absorption test.

[0045] 5) Based on the closing resistor RThe system absorbs energy and meets the requirements for energy density, and automatically calculates the discharge voltage of the energy absorption discharge circuit based on the output current expression of the energy absorption discharge circuit.

[0046] 6) Set the scale factor for the impulse current sensor for the energy absorption withstand test of the closing resistor and the impulse voltage sensor for measuring the voltage across the closing resistor; 7) Set the scale of the oscilloscope for energy absorption measurement. The computer measurement and control system will also automatically set the oscilloscope scale according to the amplitude of the impulse voltage across the set closing resistor.

[0047] (3) Operating closing resistor Z r Energy absorption tolerance test monitoring and management software.

[0048] (4) The computer measurement and control management system 4 automatically controls the energy storage capacitor of the controllable high voltage DC charging power supply 1 to the double exponential impulse current generating unit 2. C The charging process is controlled by the DC voltage divider 1-2 of the controllable high-voltage DC charging power supply 1, which automatically tracks the energy storage capacitor. C The real-time state of the charging voltage at both ends, when the energy storage capacitor... C When the charging voltage at both ends reaches the preset test conditions, the control unit 8 sends a discharge pulse, causing the discharge switch G of the double exponential impulse current generating unit 2 to break down and conduct. The generated impulse current then flows through the closing resistor. R Impact energy is absorbed on the z-axis.

[0049] (5) The computer measurement and control management system 4 extracts and records the pulse voltage divider, pulse current sensor and oscilloscope, and processes and analyzes the impact energy absorbed by the closing resistor through data transmission between the computer and the oscilloscope.

[0050] (6) When applied to the closing resistor R When the current or voltage waveform across terminals z is distorted, the computer-controlled measurement and management system 4 automatically provides the closing resistor. R The system uses control criteria to determine if surface flashover or explosion occurs, displays and stores test data and waveforms, and stops the closing resistor. R z Energy absorption tolerance test.

[0051] If the closing resistor R If the energy absorption tolerance test is passed, the computer measurement and control unit 4 displays and stores the test data and waveforms, and starts the next energy absorption test under preset conditions.

[0052] The present invention has been described in detail with reference to the above embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and such modifications or equivalent substitutions should be covered within the scope of the claims of this patent.

Claims

1. A circuit breaker closing resistor energy absorption withstand test device based on double exponential impulse current wave, characterized in that: It includes a controllable high-voltage DC charging power supply (1), a double exponential impulse current generating unit (2), a closing resistor load (3), and a computer measurement and control management system (4). The controllable high-voltage DC charging power supply (1) consists of a high-voltage DC charging power supply (1-1) and a DC voltage divider (1-2), and its function is to charge the energy storage element of the double exponential impulse current generating unit (2) of the energy absorption test. The double-exponential impulse current generating unit (2) includes an energy storage capacitor C, a discharge switch G, a waveform forming inductor L, and a protection resistor. R p and closing resistor R z, its function is to generate an energy absorption waveform that meets the standard requirements and apply it to both ends of the closing resistor load (3); the closing resistor load (3) is the closing resistor Zr, and the double exponential impulse current generating unit (2) is connected to the closing resistor Zr to form an energy absorption withstand voltage generating circuit. Through the analysis of the transient process of the energy absorption withstand voltage generating circuit, the closing resistor within 8-11ms is obtained. R z absorbs the impact energy and the closing resistance. R The relationship between the resistance value of z and the circuit parameters; The computer measurement and control management system (4) is used to extract and record the energy absorption applied across the closing resistor Zr, and realize the control of the closing resistor energy absorption withstand voltage test and the data processing of energy absorption. The energy storage capacitor in the energy absorption withstand voltage generation circuit C The high-voltage terminal of the discharge switch G is electrically connected to the high-voltage terminal of the discharge switch G, and the low-voltage terminal of the discharge switch G is connected to the waveform adjustment inductor. L Electrical connection at the high-voltage end, waveform adjustment inductor L Low voltage terminal and protection resistor R p Electrical connection of high voltage end, protection resistor R p The other end is connected to the closing resistor. R One end of z is electrically connected; closing resistor R The other end of z is connected to the energy storage capacitor. C Low-voltage electrical connection; The computer measurement and control management system (4) includes a pulse voltage divider (5), a pulse current sensor (6), an oscilloscope (7), a control unit (8), and a computer (9). The energy absorption applied across the closing resistor is extracted and recorded by a pulse voltage divider, a pulse current sensor, and an oscilloscope. The control of the closing resistor energy absorption withstand voltage test and the data processing of energy absorption are realized through data communication between the computer (9) and the oscilloscope (7). The computer (9) automatically judges the results of the energy absorption test of the closing resistor Zr based on the characteristics of the voltage and current signals extracted by the pulse voltage divider and pulse current sensor and collected by the oscilloscope, and gives the judgment results; The control unit (8) consists of a charging voltage monitoring circuit (8-1) and a programmable controller (8-2). The charging voltage monitoring circuit (8-1) automatically monitors the charging process of the closing resistor energy absorption test; the programmable controller (8-2) cooperates with the computer to automatically control the process of the closing resistor energy absorption withstand test.

2. The circuit breaker closing resistor energy absorption withstand test device based on double exponential impulse current wave as described in claim 1, characterized in that: The charging voltage of the controllable high-voltage DC charging power supply (1) is set through the human-machine interface, or controlled by the charging voltage monitoring circuit (8-1) through communication between the computer measurement and control management system (4) and the controllable high-voltage DC charging power supply (1).

3. The circuit breaker closing resistor energy absorption withstand test device based on double exponential impulse current wave as described in claim 2, characterized in that: The energy storage capacitor C and the waveform forming inductor L are high-voltage components that can be discretely adjusted.

4. A method for energy absorption withstand test of circuit breaker closing resistor based on the double exponential impulse current wave of the test device as described in claim 3, characterized in that... Includes the following steps: (1) Computer measurement and control management system for energy absorption and withstand test of double exponential impulse current wave energy of opening closing resistor; (2) In the closing resistor R The human-machine interface for the energy absorption withstand test allows setting information and test parameters for the closing resistor energy absorption withstand test. (3) Operating closing resistor Z r-energy absorption tolerance test monitoring and management software; (4) Computer measurement and control management system (4) Automatically controls the controllable high voltage DC charging power supply (1) to the energy storage capacitor of the double exponential impulse current generating unit (2). C The charging process is carried out, and the energy storage capacitor is automatically tracked by the DC voltage divider (1-2) of the controllable high-voltage DC charging power supply (1). C The real-time state of the charging voltage at both ends, when the energy storage capacitor... C When the charging voltage at both ends reaches the preset test conditions, the control unit (8) sends a discharge pulse, causing the discharge switch G of the double exponential impulse current generating unit (2) to break down and conduct. The generated impulse current passes through the closing resistor. R Impact energy absorption is formed on z; (5) Computer measurement and control management system (4) Extracts and records the pulse voltage divider, pulse current sensor and oscilloscope, and processes and analyzes the impact energy absorbed by the closing resistor through data transmission between the computer and the oscilloscope; (6) When applied to the closing resistor R When the current or voltage waveform across z is distorted, the computer measurement and control management system (4) automatically provides the closing resistor. R The system uses control criteria to determine if surface flashover or explosion occurs, displays and stores test data and waveforms, and stops the closing resistor. R z Energy absorption tolerance test.

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