CN112345903A - A voltage generating device and method for power frequency superimposed impulse voltage - Google Patents
A voltage generating device and method for power frequency superimposed impulse voltage Download PDFInfo
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
本发明公开了一种用于工频叠加冲击电压的电压发生装置及方法，属于高电压技术领域。本发明装置，包括：冲击电压发生单元产生雷电/操作冲击电压；工频电压发生单元产生50Hz工频电压；隔离球隙、所述隔离球隙用于隔离工频电压；叠加电压分压器、所述叠加电压分压器将雷电/操作冲击电压与工频电压进行叠加，并将叠加后的电压以预设的比例转换为低电压信号；二次侧仪表、所述二次侧仪表接入低电压信号，对低电压信号进行测量，所述低电压信号即为所述装置发生的工频叠加冲击电压的电压。本发明电压叠加稳定性好，可以适用于工频电压和冲击电压的叠加电压的各类试验测试。
The invention discloses a voltage generating device and a method for superimposing impulse voltage of power frequency, belonging to the technical field of high voltage. The device of the present invention includes: the impulse voltage generating unit generates lightning/operation impulse voltage; the power frequency voltage generating unit generates 50Hz power frequency voltage; the isolation spherical gap is used to isolate the power frequency voltage; the superimposed voltage divider, The superimposed voltage divider superimposes the lightning/operation impulse voltage and the power frequency voltage, and converts the superimposed voltage into a low-voltage signal at a preset ratio; the secondary side meter and the secondary side meter are connected Low voltage signal, measure the low voltage signal, and the low voltage signal is the voltage of the power frequency superimposed impulse voltage generated by the device. The invention has good voltage superposition stability, and can be applied to various test tests of superimposed voltages of power frequency voltage and impulse voltage.
Description
Technical Field
The invention relates to the technical field of high voltage, in particular to a voltage generating device and method for power frequency superimposed impulse voltage.
Background
Transient voltage in the power grid fault process is a key evidence for revealing the true cause of the fault and is a main basis for reasonably designing insulation configuration.
The transient voltage in the power grid is various, including lightning overvoltage and operation overvoltage, how to accurately, quickly and safely measure the overvoltage of a power system has a crucial effect on understanding and inhibiting the damage of the overvoltage, and the method becomes a hot point problem concerned by the current power system.
Disclosure of Invention
In order to solve the above problems, the present invention provides a voltage generating apparatus for power frequency superimposed impulse voltage, comprising:
the impulse voltage generating unit generates lightning/operation impulse voltage, adjusts the amplitude and the polarity of the lightning/operation impulse voltage, and measures the lightning/operation impulse voltage with the amplitude and the polarity adjusted;
the power frequency voltage generating unit and the power frequency voltage generating unit generate 50Hz power frequency voltage, the amplitude of the power frequency voltage is adjusted, and the power frequency voltage with the amplitude adjusted is measured;
the isolation spherical gap is used for isolating power frequency voltage;
the controller is used for setting a phase angle formed by superposing the lightning/operation impulse voltage and the power frequency voltage, accurately superposing the lightning/operation impulse voltage on any phase angle in one period of the power frequency voltage, tracking the phase angle of the power frequency voltage by the lightning/operation impulse voltage and generating a trigger signal to control the spherical gap conduction of an impulse voltage generator of an impulse voltage generating unit after selecting the superposed phase angle, superposing the lightning/operation impulse voltage on the preset phase angle of the power frequency voltage, and outputting the superposed voltage;
the superposed voltage divider is used for measuring superposed voltage and converting the superposed voltage into a low-voltage signal according to a preset proportion;
and the secondary side instrument are connected with a low-voltage signal to measure the low-voltage signal, and the low-voltage signal converted by the voltage division ratio of the superposed voltage divider is the voltage of the power frequency superposed impulse voltage generated by the device.
Optionally, the impulse voltage generating unit includes:
the impulse voltage generator generates lightning/operation impulse voltages with different time parameters;
the different time parameters are generated by changing the loop parameters of the impulse voltage generator;
the industrial personal computer is used for adjusting the amplitude and polarity of the generated lightning/operation impact voltage;
and the impulse voltage divider is a weak damping capacitive voltage divider and is used for measuring the lightning/operation impulse voltage with the amplitude and the polarity adjusted.
Optionally, the power frequency voltage generating unit includes:
the power frequency voltage generator and the power frequency voltage generator generate 50Hz power frequency voltage;
the industrial personal computer adjusts the amplitude of the power frequency voltage;
and the power frequency voltage divider is a pure capacitance voltage divider and is used for measuring the power frequency voltage with the amplitude and the polarity adjusted.
Optionally, the apparatus further includes a protection resistor, where the protection resistor includes:
the power frequency side protection resistor is used for preventing lightning/operation impact voltage from damaging equipment on the power frequency side when voltage is superposed;
and the power frequency source protection resistor is used for preventing the power frequency voltage from damaging the power frequency voltage generator when the voltage is superposed.
Optionally, the ball distance of the isolation ball gap is adjusted according to the voltage level of the power frequency voltage.
Optionally, the apparatus further comprises:
and the protection lightning arrester is connected between the impulse voltage generating unit and the isolation ball gap in series and is used for protecting the isolation ball gap.
Optionally, the superimposed voltage divider is a resistor-capacitor series voltage divider;
the rated voltage of the power frequency voltage accessed when the superposed voltage divider superposes the voltage is 1/3 of the rated voltage of the lightning/operation impact voltage accessed.
Optionally, the impulse voltage generation unit, the power frequency voltage generation unit and the superimposed voltage divider are all connected to the ground.
The invention also provides a voltage generation method for power frequency superimposed impulse voltage, which comprises the following steps:
the operation impact generation unit generates lightning/operation impact voltage, adjusts the amplitude and the polarity of the lightning/operation impact voltage, and measures the lightning/operation impact voltage with the amplitude and the polarity adjusted;
operating the power frequency voltage generating unit to generate 50Hz power frequency voltage, adjusting the amplitude of the power frequency voltage, and measuring the power frequency voltage with the amplitude adjusted;
isolating the power frequency voltage by using an isolation spherical gap;
setting a superposed phase angle of the lightning/operation impulse voltage and the power frequency voltage by using a controller, accurately superposing the lightning/operation impulse voltage on any phase angle in one period of the power frequency voltage, after the superposed phase angle is selected, tracking the phase angle of the power frequency voltage by the lightning/operation impulse voltage and generating a trigger signal to control the spherical gap conduction of an impulse voltage generator of an impulse voltage generating unit, superposing the lightning/operation impulse voltage on the preset phase angle of the power frequency voltage, and outputting superposed voltage;
controlling a superposed voltage divider to measure superposed voltage, and converting the superposed voltage into a low-voltage signal according to a preset proportion;
and controlling a secondary side instrument to access a low-voltage signal, and measuring the low-voltage signal, wherein the low-voltage signal converted by the partial pressure ratio of the superposed voltage divider is the voltage of the power frequency superposed impulse voltage generated by the device.
The invention has good voltage superposition stability, can be suitable for various test tests of the superposed voltage of the power frequency voltage and the impulse voltage, ensures that the power frequency voltage cannot break down the spacing ball gap by the combination of the spacing ball gap and the lightning arrester, and greatly improves the stability of the superposed voltage. Different power frequency voltage amplitudes, amplitudes and polarities of impact voltages and power frequency voltage superposition phase angles can be selected according to different test required voltages.
Drawings
FIG. 1 is a structural diagram of a voltage generation device for power frequency superimposed impulse voltage according to the present invention;
FIG. 2 is a schematic diagram of a withstand test of a superimposed voltage of a voltage generating device for power frequency superimposed impulse voltage on a tested object according to the present invention;
fig. 3 is a flowchart of a voltage generation method for power frequency superimposed impulse voltage according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a voltage generating device for power frequency superimposed impulse voltage, which comprises:
the impulse voltage generating unit generates lightning/operation impulse voltage, adjusts the amplitude and the polarity of the lightning/operation impulse voltage, and measures the lightning/operation impulse voltage with the amplitude and the polarity adjusted;
the power frequency voltage generating unit and the power frequency voltage generating unit generate 50Hz power frequency voltage, the amplitude of the power frequency voltage is adjusted, and the power frequency voltage with the amplitude adjusted is measured;
the isolation spherical gap is used for isolating power frequency voltage;
the controller is used for setting a phase angle formed by superposing the lightning/operation impulse voltage and the power frequency voltage, accurately superposing the lightning/operation impulse voltage on any phase angle in one period of the power frequency voltage, tracking the phase angle of the power frequency voltage by the lightning/operation impulse voltage and generating a trigger signal to control the spherical gap conduction of an impulse voltage generator of an impulse voltage generating unit after selecting the superposed phase angle, superposing the lightning/operation impulse voltage on the preset phase angle of the power frequency voltage, and outputting the superposed voltage;
the superposed voltage divider is used for measuring superposed voltage and converting the superposed voltage into a low-voltage signal according to a preset proportion;
and the secondary side instrument are connected with a low-voltage signal to measure the low-voltage signal, and the low-voltage signal converted by the voltage division ratio of the superposed voltage divider is the voltage of the power frequency superposed impulse voltage generated by the device.
A protection resistor, the protection resistor comprising:
the power frequency side protection resistor is used for preventing lightning/operation impact voltage from damaging equipment on the power frequency side when voltage is superposed;
and the power frequency source protection resistor is used for preventing the power frequency voltage from damaging the power frequency voltage generator when the voltage is superposed.
And the protection lightning arrester is connected between the impulse voltage generating unit and the isolation ball gap in series and is used for protecting the isolation ball gap.
Wherein, the impulse voltage generator and the impulse voltage generator generate lightning/operation impulse voltages with different time parameters;
the different time parameters are generated by changing the loop parameters of the impulse voltage generator;
the industrial personal computer is used for adjusting the amplitude and polarity of the generated lightning/operation impact voltage;
and the impulse voltage divider is a weak damping capacitive voltage divider and is used for measuring the lightning/operation impulse voltage with the amplitude and the polarity adjusted.
Wherein, power frequency voltage generation unit includes:
the power frequency voltage generator and the power frequency voltage generator generate 50Hz power frequency voltage;
the industrial personal computer adjusts the amplitude of the power frequency voltage;
and the power frequency voltage divider is a pure capacitance voltage divider and is used for measuring the power frequency voltage with the amplitude and the polarity adjusted.
And the ball distance of the isolation ball gap is adjusted according to the voltage grade of the power frequency voltage.
The superposed voltage divider is a resistance-capacitance series voltage divider;
the rated voltage of the power frequency voltage accessed when the superposed voltage divider superposes the voltage is 1/3 of the rated voltage of the lightning/operation impact voltage accessed.
The impulse voltage generating unit, the power frequency voltage generating unit and the superposed voltage divider are all connected with the ground in common.
The device can be connected with a tested product, the principle is shown in figure 2, the withstand test of superimposed voltage is carried out on the tested product, and the voltage waveform of power frequency superimposed impulse voltage is required to be generated for test analysis.
A positive polarity surge voltage having a time parameter of 1.2/50 μ s and a peak of 200kV is superimposed on a 110kV power frequency voltage, and the phase angle at the time of superimposing is 90 °.
The circuit of the power frequency superposition impulse voltage generating device is connected, the ball distance of the isolation ball gap is set to be slightly larger than the 110kV power frequency voltage breakdown ball distance, and the power frequency voltage can not be transmitted to the impulse voltage generating complete device.
The peak value of impulse voltage is set to be 200kV in the industrial personal computer of the impulse voltage generating complete device, the impulse polarity is positive, and the loop parameter of the impulse voltage generator is changed into the loop parameter capable of generating 1.2/50 mu s waveform. And the impulse voltage generator is started through the industrial personal computer, is gradually charged to a state to be triggered, and can be triggered and released through control software at any time.
The industrial personal computer of the power frequency voltage generation complete device sets the effective value of the power frequency voltage to be 110kV, the industrial personal computer starts the power frequency voltage generator, the power frequency voltage generation complete device gradually boosts at the moment, the power frequency voltage of 110kV is finally output, and the output power frequency voltage of 110kV is applied to the resistance-capacitance voltage divider and the tested object.
Setting the phase angle of voltage superposition to be 90 degrees in control software, reading the relation between the power frequency voltage phase angle and time generated by a power frequency voltage generator by the control software, and performing the following calculation:
and delta t is the delay time of triggering, a trigger key is pressed in the control software, the control software is triggered by delta t (0.005s) after the first zero crossing point in one period of the power frequency voltage, at the moment, the spherical gap of the impulse voltage generator is conducted and discharged to generate impulse voltage, the impulse voltage passes through the protective lightning arrester and the isolation spherical gap and is finally applied to the resistance-capacitance voltage divider and the tested product, and the impulse voltage and the previously applied 110kV power frequency voltage form the required superposed voltage waveform. One path of the superposed voltage is applied to a tested product, the other path of the superposed voltage passes through the resistance-capacitance voltage divider and is input into the secondary side instrument through the secondary side output port, and the superposed voltage waveform generated by analysis can be observed in the secondary side instrument.
The invention also provides a voltage generation method for power frequency superimposed impulse voltage, as shown in fig. 3, comprising:
the operation impact generation unit generates lightning/operation impact voltage, adjusts the amplitude and the polarity of the lightning/operation impact voltage, and measures the lightning/operation impact voltage with the amplitude and the polarity adjusted;
operating the power frequency voltage generating unit to generate 50Hz power frequency voltage, adjusting the amplitude of the power frequency voltage, and measuring the power frequency voltage with the amplitude adjusted;
isolating the power frequency voltage by using an isolation spherical gap;
setting a superposed phase angle of the lightning/operation impulse voltage and the power frequency voltage by using a controller, accurately superposing the lightning/operation impulse voltage on any phase angle in one period of the power frequency voltage, after the superposed phase angle is selected, tracking the phase angle of the power frequency voltage by the lightning/operation impulse voltage and generating a trigger signal to control the spherical gap conduction of an impulse voltage generator of an impulse voltage generating unit, superposing the lightning/operation impulse voltage on the preset phase angle of the power frequency voltage, and outputting superposed voltage;
controlling a superposed voltage divider to measure superposed voltage, and converting the superposed voltage into a low-voltage signal according to a preset proportion;
and controlling a secondary side instrument to access a low-voltage signal, and measuring the low-voltage signal, wherein the low-voltage signal converted by the partial pressure ratio of the superposed voltage divider is the voltage of the power frequency superposed impulse voltage generated by the device.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. A voltage generation device for power frequency superimposed surge voltage, the device comprising:
the impulse voltage generating unit generates lightning/operation impulse voltage, adjusts the amplitude and the polarity of the lightning/operation impulse voltage, and measures the lightning/operation impulse voltage with the amplitude and the polarity adjusted;
the power frequency voltage generating unit and the power frequency voltage generating unit generate 50Hz power frequency voltage, the amplitude of the power frequency voltage is adjusted, and the power frequency voltage with the amplitude adjusted is measured;
the isolation spherical gap is used for isolating power frequency voltage;
the controller is used for setting a phase angle formed by superposing the lightning/operation impulse voltage and the power frequency voltage, accurately superposing the lightning/operation impulse voltage on any phase angle in one period of the power frequency voltage, tracking the phase angle of the power frequency voltage by the lightning/operation impulse voltage and generating a trigger signal to control the spherical gap conduction of an impulse voltage generator of an impulse voltage generating unit after selecting the superposed phase angle, superposing the lightning/operation impulse voltage on the preset phase angle of the power frequency voltage, and outputting the superposed voltage;
the superposed voltage divider is used for measuring superposed voltage and converting the superposed voltage into a low-voltage signal according to a preset proportion;
and the secondary side instrument are connected with a low-voltage signal to measure the low-voltage signal, and the low-voltage signal converted by the voltage division ratio of the superposed voltage divider is the voltage of the power frequency superposed impulse voltage generated by the device.
2. The apparatus of claim 1, the surge voltage generation unit, comprising:
the impulse voltage generator generates lightning/operation impulse voltages with different time parameters;
the different time parameters are generated by changing the loop parameters of the impulse voltage generator;
the industrial personal computer is used for adjusting the amplitude and polarity of the generated lightning/operation impact voltage;
and the impulse voltage divider is a weak damping capacitive voltage divider and is used for measuring the lightning/operation impulse voltage with the amplitude and the polarity adjusted.
3. The apparatus of claim 1, the power frequency voltage generation unit comprising:
the power frequency voltage generator and the power frequency voltage generator generate 50Hz power frequency voltage;
the industrial personal computer adjusts the amplitude of the power frequency voltage;
and the power frequency voltage divider is a pure capacitance voltage divider and is used for measuring the power frequency voltage with the amplitude and the polarity adjusted.
4. The apparatus of claim 1, further comprising, a protection resistor comprising:
the power frequency side protection resistor is used for preventing lightning/operation impact voltage from damaging equipment on the power frequency side when voltage is superposed;
and the power frequency source protection resistor is used for preventing the power frequency voltage from damaging the power frequency voltage generator when the voltage is superposed.
5. The apparatus of claim 1, the isolation ball gap having a ball pitch that is adjusted according to a voltage class of the power frequency voltage.
6. The apparatus of claim 1, the apparatus further comprising:
and the protection lightning arrester is connected between the impulse voltage generating unit and the isolation ball gap in series and is used for protecting the isolation ball gap.
7. The apparatus of claim 1, the superimposed voltage divider being a resistive-capacitive series divider;
the rated voltage of the power frequency voltage accessed when the superposed voltage divider superposes the voltage is 1/3 of the rated voltage of the lightning/operation impact voltage accessed.
8. The apparatus of claim 1, wherein the surge voltage generation unit, the power frequency voltage generation unit and the superimposed voltage divider are all connected in common.
9. A voltage generation method for power frequency superimposed surge voltage using any of the apparatus of claims 1-8, the method comprising:
the operation impact generation unit generates lightning/operation impact voltage, adjusts the amplitude and the polarity of the lightning/operation impact voltage, and measures the lightning/operation impact voltage with the amplitude and the polarity adjusted;
operating the power frequency voltage generating unit to generate 50Hz power frequency voltage, adjusting the amplitude of the power frequency voltage, and measuring the power frequency voltage with the amplitude adjusted;
isolating the power frequency voltage by using an isolation spherical gap;
setting a superposed phase angle of the lightning/operation impulse voltage and the power frequency voltage by using a controller, accurately superposing the lightning/operation impulse voltage on any phase angle in one period of the power frequency voltage, after the superposed phase angle is selected, tracking the phase angle of the power frequency voltage by the lightning/operation impulse voltage and generating a trigger signal to control the spherical gap conduction of an impulse voltage generator of an impulse voltage generating unit, superposing the lightning/operation impulse voltage on the preset phase angle of the power frequency voltage, and outputting superposed voltage;
controlling a superposed voltage divider to measure superposed voltage, and converting the superposed voltage into a low-voltage signal according to a preset proportion;
and controlling a secondary side instrument to access a low-voltage signal, and measuring the low-voltage signal, wherein the low-voltage signal converted by the partial pressure ratio of the superposed voltage divider is the voltage of the power frequency superposed impulse voltage generated by the device.
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Cited By (1)
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| CN115047301A (en) * | 2022-06-29 | 2022-09-13 | 中国电力科学研究院有限公司 | Method and system for measuring power frequency superposition operation impulse voltage signal |
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