CN117074883A - Switching-on resistor operation impulse voltage loop parameter design method for circuit breaker and operation impulse tolerance test device - Google Patents
Switching-on resistor operation impulse voltage loop parameter design method for circuit breaker and operation impulse tolerance test device Download PDFInfo
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Abstract
The invention discloses a method for designing parameters of a switching-on resistor operation impulse voltage loop and an operation impulse tolerance test device for a circuit breaker, which are based on transient analysis of an operation impulse voltage generation loop, obtain the correlation rules between voltage characteristics at two ends of the switching-on resistor of the circuit breaker and load resistance and loop parameters, establish the design method suitable for the parameters of the switching-on operation impulse voltage generation loop with different resistance values, establish the operation impulse tolerance test device for the switching-on resistor of the circuit breaker on the basis of the design method, solve the problem that the conventional operation impulse high-voltage test system cannot perform operation impulse withstand voltage test on a resistive load, and provide standardized test technology for operation safety of the circuit breaker and a power system.
Description
Technical Field
The invention relates to the technical field of electrical engineering, in particular to a switching-on resistor operation impulse voltage loop parameter design method for a circuit breaker and an operation impulse tolerance test device.
Background
With the development of ultra-high voltage transmission technology in China, the switching-on resistor is widely used in 330kV and above transmission lines, is used for limiting overvoltage generated in the switching-on and switching-off process of a high-voltage circuit breaker and inhibiting arc reignition, and is core protection of ultra-high voltage transmission and transformation equipment.
Linear resistors are important protection devices for the closing process of circuit breakers and are also effective protection measures to limit operating overvoltages. At present, the switching-on resistance of a breaker used in a high-voltage transmission line in China almost completely depends on import. The preparation research of carbon-ceramic linear resistors, zinc oxide linear resistors and the like in China is started, but no substantial technological breakthrough exists, and particularly, the high-voltage test technology for the linear resistors in the ultra-high voltage transmission line is blank at home and abroad.
The operation impact withstand voltage test is a key test project of power equipment and the like, and has no reference to the related international electrotechnical commission and national standard for the operation impact withstand voltage test of the closing resistor of the circuit breaker. In the high-voltage insulation test, the MARX operation impact generator is widely applied to insulation performance tests of electric insulation materials and power equipment such as insulators, bushings and the like, but in the existing high-voltage test technology, the MARX operation impact generator is mainly aimed at test objects in high-resistance states of the electric insulation materials, the power equipment and the like, and operation impact withstand voltage tests of switching resistances and similar power equipment or power devices are not suitable, and the main reason is that the conventional state of the switching resistances of circuit breakers is low-resistance. The test results prove that: when the conventional MARX operation surge generator acts on the switching resistor, the surge voltage waveform applied to the switching resistor load will be significantly distorted. Therefore, the design of a circuit breaker switching-on resistor high-voltage operation impulse voltage tolerance test loop, the research of a test technology and the development of a test device are developed, the research of a carbon-ceramic linear switching-on resistor formula and a process can be promoted, the application of the carbon-ceramic linear switching-on resistor in an ultra-high voltage transmission system is accelerated, and the development of a test standard of the circuit breaker switching-on resistor has important theoretical significance and engineering application value.
Disclosure of Invention
The invention aims to provide a design method and an operation impact tolerance test device for a switching-on resistor operation impact voltage loop parameter for a circuit breaker, and a design method and a test device for establishing an impact generation loop suitable for switching-on resistors with different resistance values to operate impact tolerance voltage.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a design method of a closing resistor operation impulse voltage loop parameter for a circuit breaker is characterized by comprising the following steps of: according to the form of an operation impulse voltage generation loop, theoretical analysis of correlation rules between transient voltage waveforms at two ends of a closing resistor load and loop parameters is carried out, and the operation impulse voltage generation loop is formed by an energy storage capacitor C 1 The waveform forming inductor L and the first waveform forming or protecting resistor Rps and the second waveform forming or protecting resistor Rpo are formed; the relation between impulse voltage waveform parameters applied to two ends of the switching-on resistor Zr and the resistance value and the loop parameters of the switching-on resistor Zr is obtained through analysis of the transient process of the loop; and obtaining parameter design principles of the impulse voltage loop operated by the switching-on resistors with different resistance values.
Further, an energy storage capacitor C in the operation surge voltage generation circuit 1 The high-voltage end of the discharge switch G is electrically connected with the high-voltage end of the waveform adjusting inductor L, the low-voltage end of the waveform adjusting inductor L is electrically connected with the high-voltage end of the first waveform forming or protecting resistor Rps, and the other end of the first waveform forming or protecting resistor Rps is electrically connected with one end of the closing resistor Zr; the other end of the switching-on resistor Zr and the energy storage capacitor C 1 Is electrically connected with the low voltage end of the power supply; the electric connection part of the discharging switch G and the adjusting inductor L is connected with the energy storage capacitor C 1 Is connected in parallel with the second waveform between the low voltage ends of (a) to form or protectResistance Rpo.
Further, the current expression in the operating surge voltage generation loop is:
the voltage expression acting across the closing resistor Zr is:
in the method, in the process of the invention,U 0 to operate the energy-storage capacitor C in the surge voltage generation circuit 1 The charge/discharge voltage across the terminals.
A closing resistance operation impact tolerance test device for a circuit breaker comprises: the system comprises a controllable high-voltage direct-current charging power supply, an operation impact discharging unit, a closing resistor load and a computer measurement and control management system;
the controllable high-voltage direct-current charging power supply consists of an adjustable high-voltage direct-current charging power supply and a direct-current voltage divider, and is used for charging an energy storage capacitor element for operating the impact discharge unit;
the operation impulse discharging unit is an operation impulse voltage generating loop, the switching-on resistor Zr is a switching-on resistor load, and the energy storage capacitor C 1 The discharge switch G and the waveform forming inductor L, the first waveform forming or protecting resistor Rps and the second waveform forming or protecting resistor Rpo are used for generating operation impulse voltage when discharging the switching-on resistor Zr and applying the operation impulse voltage to two ends of a switching-on resistor load;
the computer measurement and control management system is used for automatically monitoring the charging process of the switching-on resistor operation impact tolerance test and automatically controlling the flow of the switching-on resistor operation impact tolerance test; the analysis and the discrimination of the impact tolerance test result of the switching-on resistor operation are realized; extracting, recording, storing, inquiring and outputting test report of the switching-on resistor impact withstand voltage test signals.
Further, the energy storage capacitor C 1 The two ends are connected in parallel with the high-voltage end and the low-voltage end of the adjustable high-voltage direct-current charging power supply, and the energy storage capacitor C 1 The high-voltage end of the discharge switch G is electrically connected with the high-voltage end of the waveform forming inductor L, the low-voltage end of the waveform forming inductor L is electrically connected with the high-voltage end of the first waveform forming or protecting resistor Rps, and the other end of the first waveform forming or protecting resistor Rps is electrically connected with one end of the closing resistor Zr; the other end of the load Zr is connected with the low-voltage end or the energy storage capacitor C of the controllable high-voltage direct-current charging power supply 1 A second waveform forming or protecting resistor Rpo connected in parallel with the energy storage capacitor C and at the electric connection point of the discharge switch G and the waveform forming inductor L 1 Is provided between the low voltage ends of the first and second electrodes.
Further, the energy storage capacitor C 1 The discharge switch G, the waveform forming inductor L, the first waveform forming or protecting resistor Rps and the second waveform forming or protecting resistor Rpo are components with discretely adjustable parameters.
Further, the computer measurement and control management system comprises a pulse voltage divider, an oscilloscope, a control unit and a computer; the control unit is composed of a charging voltage monitoring circuit and a programmable controller to realize the flow of an automatic control switching-on resistor operation impact tolerance test; the operation impulse voltage applied by the two ends of the switching-on resistor load is extracted and recorded by the pulse resistor voltage divider and the oscilloscope, and the control and the data processing of the switching-on resistor lightning impulse withstand voltage test are realized through the data communication between the computer and the oscilloscope.
According to the design method of the circuit parameters of the switching-on resistor operation impulse voltage for the circuit breaker, theoretical analysis of correlation rules between transient voltage waveforms at two ends of a switching-on resistor load and the circuit parameters is carried out according to the designed operation impulse voltage generation circuit form, a circuit parameter design principle aiming at the switching-on resistor operation impulse tolerance test with different resistance values is obtained, and components and parts can be discretely adjusted through an energy storage capacitor, a discharge switch, a waveform adjusting inductor and a resistor to realize and control, so that the requirements of the switching-on resistor operation impulse voltage test waveforms with different resistance values are met. The problem that the existing operation impact high-voltage test system cannot perform operation impact withstand voltage test on a resistive load is solved, and a standardized test technology is provided for operation safety of a circuit breaker and a power system.
On the basis, an operation impact tolerance test device of the switching-on resistor of the circuit breaker is established, a control method of the operation impact tolerance test of the switching-on resistor of the circuit breaker is provided, and the test method and the test device can be used for similar scenes such as resistive load operation impact withstand voltage tests in the fields of power, communication and the like.
In order to prevent the interference and damage of the on-line flashover breakdown or the broken open circuit on the energy storage capacitor, the measuring system and the computer management system, a protection measure for preventing the on-line flashover or the explosion open circuit of the on-line resistance load is arranged in the operation impulse voltage generation loop, so that the damage caused by the occurrence of overcurrent of the loop and the measurement and control system or the incapability of releasing the energy storage electric energy or the operation accident of the on-line resistance operation impulse tolerance test system is avoided.
Drawings
FIG. 1a is a schematic diagram of a surge voltage generation circuit for a closing resistor operating surge tolerance test for a circuit breaker according to the present invention;
FIG. 1b is an equivalent circuit diagram of the surge voltage generation circuit of FIG. 1a of the surge withstand test of the closing resistor operation for the circuit breaker of the present invention;
fig. 2a is a voltage waveform diagram of two ends of a closing resistor at a first moment in a closing resistor operation surge withstand voltage test process for a circuit breaker when a planar flashover breakdown occurs;
fig. 2b is a voltage waveform diagram of two ends of the closing resistor at the second moment when the closing resistor generates a planar flashover breakdown in the process of the closing resistor operation surge withstand voltage test for the circuit breaker;
FIG. 2c is a waveform diagram of the current through the closing resistor when the closing resistor is flashed at different times during an operational shock tolerance test;
FIG. 3 is a graph of the range of selection of loop parameters for the surge withstand voltage test of the switching-on resistors with different resistance values;
FIG. 4 is a block diagram showing the constitution of a closing resistance operation impact resistance test device for a circuit breaker according to the present invention;
FIG. 5 is a measurement and control flow chart of a closing resistor operation impact tolerance test for a circuit breaker according to the present invention;
in the figure: the system comprises a 1-controllable high-voltage direct-current charging power supply, a 1-2-direct-current voltage divider, a 2-operation impact discharge unit, a 3-closing resistance load, a 4-computer measurement and control management system, a 5-pulse voltage divider, a 6-oscilloscope, a 7-control unit, an 8-computer, a 7-1-charging voltage monitoring circuit and a 7-2-programmable controller.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
Referring to fig. 1a and 1b, the switching-on resistor operation impact tolerance test device for a circuit breaker of the invention is characterized in that an operation impact voltage wave mainly comprises an energy storage capacitor C 1 The waveform forming inductance L and the first waveform forming or protecting resistor Rps, the second waveform forming or protecting resistor Rpo. And obtaining the relation between the impulse voltage waveform parameters applied to the two ends of the switching-on resistor Zr and the resistance value and the loop parameters of the switching-on resistor Zr through analysis of the transient process of the loop.
Electrical connection of the circuit occurs:
energy storage capacitor C 1 The high-voltage end of the discharge switch G is electrically connected with the high-voltage end of the waveform adjusting inductor L, the low-voltage end of the waveform adjusting inductor L is electrically connected with the high-voltage end of the first waveform forming or protecting resistor Rps, and the other end of the first waveform forming or protecting resistor Rps is electrically connected with one end of the closing resistor Zr; the other end of the switching-on resistor Zr and the energy storage capacitor C 1 Is electrically connected with the low voltage end of the power supply; at the same time, the electric connection part of the discharging switch G and the adjusting inductance L is connected with the energy storage capacitor C 1 A second waveform forming or protection resistor Rpo is also connected in parallel between the low voltage terminals of (a).
The principle of operating the surge withstand voltage generating circuit is to use the charged energy storage capacitor C 1 In the followingWhen the discharge switch G is turned on, the inductor L and the first waveform forming or protecting resistor Rps and the second waveform forming or protecting resistor Rpo are instantaneously formed by waveforms, and the switching resistor Zr is released, so that an operation impulse is generated at both ends of the switching resistor Zr.
Circuit analysis of voltage at two ends of switching-on resistor Zr
In order to obtain an analytical expression of the voltages across the closing resistor Zr, the generating loop of fig. 1a may be equivalent to and analyzed by the series branch shown in fig. 1b at the moment when the discharging switch G is turned on. In FIG. 1b, the storage capacitor C 1 The parallel branch with the second waveform forming or protection resistor Rpo may be equivalent to the energy storage capacitor C 1 And waveform forming resistor R' po Is a series branch of (c). Wherein,
and (3) making: r=r' po +R ps +Z r Thus, the differential equation for the circuit shown in FIG. 2b is obtained as:
solving equation 1 may result in the feature root of equation 1 as:
thus, the current in the solving operation surge voltage generation loop of equation 1 is:
according to the initial conditions of the operating impulse voltage generation circuit:
the coefficients in equation 3 can be found as:
further, the current in the operating surge voltage generation circuit was obtained as:
according to the waveform parameters of the operation impulse voltage of 250/2500 mu s and the pure resistance characteristic of the switching-on resistor Zr, the impulse current wave flowing through the switching-on resistor Zr is consistent with the waveform parameters of the voltages at two ends, and the impulse current wave is unipolar double-exponential wave with fast rise time and slow fall time, namely the impulse generation loop 2 is in an over-damped oscillation state.
The current expression in the operating surge voltage generation loop is:
the voltage expression acting across the closing resistor Zr is:
next, according to expression 8, the peak time and half-peak time of the surge voltage waveform acting on both ends of the closing resistor Zr can be calculated by numerical calculation. Wherein the peak time T P Half-peak time T is the time interval between the apparent origin of the impulse voltage waveform and the voltage peak 2 Is the time interval between the apparent origin of the impulse voltage waveform and the moment when the voltage drops to 50% of the peak value.
In the method, in the process of the invention,U 0 to operate the charge/discharge voltage across the storage capacitor in the surge voltage discharge unit 2.
Referring to fig. 2a, 2b, 2c and 3, the present invention provides a closing resistance operation impact tolerance test method and test apparatus for a circuit breaker. Referring to fig. 2a, if the switching resistor breaks down by the planar flashover during the test of the operation surge withstand voltage of the switching resistor load for the circuit breaker, a larger surge voltage flows in the operation surge voltage generation circuit, which is greatly different from the current flowing in the Marx generation circuit in the conventional high voltage test technology. Fig. 2b and fig. 2c show current waveforms of the circuit when the switching resistor applies different moments to the operating surge voltage, so that it can be seen that when the switching resistor generates a flashover breakdown along a plane near a peak of the operating surge voltage waveform, the circuit has a surge current with a larger amplitude and the surge current continuously oscillates for a longer time, which brings about a relatively large consideration to the parameter selection of components in the operating surge voltage circuit.
The energy storage capacitor not only has higher withstand voltage, the rated value of the energy storage capacitor is determined by the maximum withstand voltage of the tested switching resistance element or the proportion unit, but also bears nearly 100% of reverse polarity current, and the important consideration is needed when a dry metallized film capacitor with weak reverse polarity withstand performance is selected.
In order to limit the current peak value in the impulse generation loop when the closing resistor generates the surface flashover breakdown, a circuit design mode that a first waveform is formed or a protection resistor Rps is compatible with the current limiting resistor is added in the operation voltage impulse generation loop, so that the situation that the impulse generation loop evolves into a deep under-damped oscillation loop when the closing resistor generates the surface flashover breakdown is effectively avoided, and a high voltage test accident occurs.
Meanwhile, in order to prevent the switching-on resistor from being cracked and opened in the operation impact voltage-resistant process, electric field energy on the energy storage capacitor cannot be released, and a second waveform forming or protecting resistor Rpo is further designed in the operation impact generating circuit.
Operating a shock voltage waveThe shape parameters are defined by the international electrotechnical commission or the national standard: peak time T of operating surge voltage waveform 1 And the tolerance deviation is 250 mu s plus or minus 20 percent, namely the peak time of the operation impulse voltage can be 200 to 300 mu s; the half-peak time and its tolerance are 2500 μs + -60%, i.e. the half-peak time of the operating surge voltage can be 1000-4000 μs. Thus, a parameter design selection method for a surge withstand voltage test surge generation loop operated by switching-on resistors Zr with different resistance values is obtained, and is shown in figure 3. Energy storage capacitor C for switching-on resistor Zr loads with different resistance values 1 And the waveform tuning inductance L should be selected within the range of the upper and lower envelopes.
Referring to fig. 4, the invention relates to a breaker closing resistor operation impulse voltage tolerance test device which mainly comprises a controllable high-voltage direct-current charging power supply 1, an operation impulse discharging unit 2, a closing resistor load 3 and a computer measurement and control management system 4.
1) The controllable high-voltage direct-current charging power supply 1 mainly comprises an adjustable controllable high-voltage direct-current charging power supply 1-1 and a direct-current voltage divider 1-2, and is used for charging an energy storage capacitor element of the operation impact discharging unit 2.
2) The operation impact discharge unit 2 mainly comprises an energy storage capacitor C 1 The discharging switch G, the waveform forming inductance L, the first waveform forming or protecting resistor Rps, the second waveform forming or protecting resistor Rpo and the closing resistor Zr3 are composed, and the main characteristics are that the capacitor C can be used 1 And the waveform forming inductance L is a high-voltage component which can be adjusted in a discrete mode, and the main function of the operation impulse discharging unit 2 is to generate an operation impulse voltage waveform meeting the standard requirement.
3) The computer measurement and control management unit 4 mainly comprises a pulse voltage divider 5, an oscilloscope 6 control unit 7 and a computer 8. The control unit 7 mainly comprises a charging voltage monitoring circuit 7-1 and a programmable controller 7-2. The main functions of the computer measurement and control management unit 4 include: (1) automatically monitoring the charging process of a closing resistor operation impact test; (2) the flow of the impact tolerance test of the switching-on resistor operation is automatically controlled by matching with a computer; (3) the analysis and the discrimination of the impact tolerance test result of the switching-on resistor operation are realized; (4) extracting, recording, storing, inquiring and outputting test report of the switching-on resistor impact withstand voltage test signals.
From this, it can be derived that: the breaker closing resistor operation impulse voltage tolerance test device comprises multiple functions of high-voltage charging, discharging, measuring, managing and the like, and can be used for operation impulse voltage withstanding type test and sampling test of the closing resistor.
Referring to fig. 5, the method for testing the impact tolerance of the switching-on resistor operation for the circuit breaker according to the invention has the following measurement and control flow of the impact withstand voltage test of the switching-on resistor operation
(1) The computer measurement and control management system for starting the switching-on resistance operation impact tolerance test comprises a power supply for starting a control unit oscilloscope 6, a control unit 7 and a computer 8, and also comprises a power supply for starting a controllable high-voltage direct-current charging power supply 1 and an impact discharge unit 2.
(2) Setting information and test parameters of a switching-on resistor operation impulse tolerance test on a measurement and control human-computer interaction interface of the switching-on resistor circuit Zr operation impulse voltage tolerance test, including but not limited to:
1) Test environment information is set, including date, temperature, humidity, test personnel and the like.
2) The product information for setting the on-off resistance may include production lot, specification, etc.
3) According to the resistance value of the tested switching resistor Zr, a proper test loop is selected or prepared.
4) The mode of operating the surge voltage test is set, including the polarity of the surge pulse and the number of surges.
5) According to the voltage amplitude of the tolerance test of the switching-on resistor Zr, and according to the output efficiency of the operation impulse discharging unit, the voltage is automatically converted into the discharging voltage of the operation impulse voltage generating circuit.
6) Setting a scale factor of a pulse voltage sensor for a switching-on resistance operation impact tolerance test;
7) The scale of the oscilloscope for operating impulse voltage measurement is set, and the computer measurement and control system can automatically set the scale of the oscilloscope according to the set discharge voltage amplitude.
(3) And running the measurement and control management software of the switching-on resistor Zr operation impact tolerance test.
(4) The computer measurement and control management unit 4 automatically controls the energy storage capacitor C of the controllable high-voltage direct-current charging power supply 1 to operate the impact discharging unit 2 1 And can automatically track the energy storage capacitor C 1 The real-time state of the charging voltage at two ends, when the energy storage capacitor C 1 When the charging voltage at both ends reaches the preset test condition, the control unit 7 sends out a discharging pulse to cause the discharging switch G of the operation impact discharging unit 2 to break down and conduct. The generated operation shock pulse is applied to the closing resistor Zr.
(5) The computer measurement and control management unit 4 extracts and records the operation impact waveform through the pulse voltage divider and the oscilloscope, and processes and analyzes the operation impact waveform through data transmission between the computer and the oscilloscope.
(6) When the operation impulse voltage applied to the two ends of the switching-on resistor Zr is distorted, the computer measurement and control management unit 4 automatically gives out a control criterion of the surface flashover breakdown of the switching-on resistor Zr, displays and stores test data and waveforms, and stops the operation impulse tolerance test of the switching-on resistor Zr.
(7) If the switching-on resistance Zr operation surge tolerance test passes, the computer measurement and control unit 4 displays and stores test data and waveforms, and starts an operation surge voltage test under the next preset condition.
Repeating the processes 5) to 7) until the switching-on resistor generates the surface flashover breakdown, and recording the maximum operation impulse voltage value of the switching-on resistor Zr without flashover as the operation impulse voltage tolerance value.
The present invention has been described in detail with reference to the above embodiments, and it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (7)
1. A design method for the parameters of a closing resistor operation impulse voltage loop for a circuit breaker is characterized in thatThe method is characterized in that: according to the form of an operation impulse voltage generation loop, theoretical analysis of correlation rules between transient voltage waveforms at two ends of a closing resistor load and loop parameters is carried out, and the operation impulse voltage generation loop is formed by an energy storage capacitor C 1 The waveform forming inductor L and the first waveform forming or protecting resistor Rps and the second waveform forming or protecting resistor Rpo are formed; the relation between impulse voltage waveform parameters applied to two ends of the switching-on resistor Zr and the resistance value and the loop parameters of the switching-on resistor Zr is obtained through analysis of the transient process of the loop; and obtaining parameter design principles of the impulse voltage loop operated by the switching-on resistors with different resistance values.
2. The method for designing a closing resistor operation surge voltage loop parameter for a circuit breaker according to claim 1, wherein: energy storage capacitor C in operation impulse voltage generation loop 1 The high-voltage end of the discharge switch G is electrically connected with the high-voltage end of the waveform adjusting inductor L, the low-voltage end of the waveform adjusting inductor L is electrically connected with the high-voltage end of the first waveform forming or protecting resistor Rps, and the other end of the first waveform forming or protecting resistor Rps is electrically connected with one end of the closing resistor Zr; the other end of the switching-on resistor Zr and the energy storage capacitor C 1 Is electrically connected with the low voltage end of the power supply; the electric connection part of the discharging switch G and the adjusting inductor L is connected with the energy storage capacitor C 1 And a second waveform forms or protects resistor Rpo between the low voltage terminals of the capacitor.
3. The method for designing a closing resistor operation surge voltage loop parameter for a circuit breaker according to claim 1, wherein: the current expression in the operating surge voltage generation loop is:
the voltage expression acting across the closing resistor Zr is:
in the method, in the process of the invention,U 0 to operate the energy-storage capacitor C in the surge voltage generation circuit 1 The charge/discharge voltage across the terminals.
4. A closing resistance operation impact tolerance test device for a circuit breaker comprises: the system comprises a controllable high-voltage direct-current charging power supply (1), an operation impact discharging unit (2), a closing resistance load (3) and a computer measurement and control management system (4);
the controllable high-voltage direct-current charging power supply (1) consists of an adjustable high-voltage direct-current charging power supply (1-1) and a direct-current voltage divider (1-2), and the controllable high-voltage direct-current charging power supply (1) is used for charging an energy storage capacitor element for operating the impact discharging unit (2);
the operation impulse discharging unit (2) is an operation impulse voltage generation loop, the switching-on resistor Zr is a switching-on resistor load (3), and the energy storage capacitor C 1 The discharge switch G and the waveform forming inductor L, the first waveform forming or protecting resistor Rps and the second waveform forming or protecting resistor Rpo are used for generating operation impulse voltage when discharging the switching-on resistor Zr and applying the operation impulse voltage to two ends of a switching-on resistor load;
the computer measurement and control management system (4) is used for automatically monitoring the charging process of the switching-on resistor operation impact tolerance test and automatically controlling the flow of the switching-on resistor operation impact tolerance test; the analysis and the discrimination of the impact tolerance test result of the switching-on resistor operation are realized; extracting, recording, storing, inquiring and outputting test report of the switching-on resistor impact withstand voltage test signals.
5. The switching-on resistance operation impact resistance test device for a circuit breaker according to claim 4, wherein: the energy storage capacitor C 1 The two ends are connected in parallel with the high-voltage end and the low-voltage end of the adjustable high-voltage direct-current charging power supply (1), and the energy storage capacitor C 1 Is electrically connected with the high voltage end of the discharge switch G, and dischargesThe low-voltage end of the switch G is electrically connected with the high-voltage end of the waveform forming inductor L, the low-voltage end of the waveform forming inductor L is electrically connected with the high-voltage end of the first waveform forming or protecting resistor Rps, and the other end of the first waveform forming or protecting resistor Rps is electrically connected with one end of the switching-on resistor Zr; the other end of the load Zr is connected with the low-voltage end or the energy storage capacitor C of the controllable high-voltage direct-current charging power supply (1) 1 A second waveform forming or protecting resistor Rpo connected in parallel with the energy storage capacitor C and at the electric connection point of the discharge switch G and the waveform forming inductor L 1 Is provided between the low voltage ends of the first and second electrodes.
6. The switching-on resistance operation impact resistance test device for a circuit breaker according to claim 4 or 5, wherein: the energy storage capacitor C 1 The discharge switch G, the waveform forming inductor L, the first waveform forming or protecting resistor Rps and the second waveform forming or protecting resistor Rpo are components with discretely adjustable parameters.
7. The switching-on resistance operation impact resistance test device for a circuit breaker according to claim 6, wherein: the computer measurement and control management system (4) comprises a pulse voltage divider (5), an oscilloscope (6), a control unit (7) and a computer (8); the control unit (7) is composed of a charging voltage monitoring circuit (7-1) and a programmable controller (7-2) to realize a process of automatically controlling the operation impact tolerance test of the closing resistor; the operation impulse voltage applied by the two ends of the switching-on resistor load (3) is extracted and recorded by the pulse resistor voltage divider (5) and the oscilloscope (6), and the control and the data processing of the switching-on resistor lightning impulse withstand voltage test are realized through the data communication between the computer (8) and the oscilloscope (6).
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|---|---|---|---|
| CN202311047235.1A CN117074883A (en) | 2023-08-18 | 2023-08-18 | Switching-on resistor operation impulse voltage loop parameter design method for circuit breaker and operation impulse tolerance test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311047235.1A CN117074883A (en) | 2023-08-18 | 2023-08-18 | Switching-on resistor operation impulse voltage loop parameter design method for circuit breaker and operation impulse tolerance test device |
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