CN108919020B - Puncture protector measuring system and puncture protector measuring instrument - Google Patents
Puncture protector measuring system and puncture protector measuring instrument Download PDFInfo
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- CN108919020B CN108919020B CN201811146524.6A CN201811146524A CN108919020B CN 108919020 B CN108919020 B CN 108919020B CN 201811146524 A CN201811146524 A CN 201811146524A CN 108919020 B CN108919020 B CN 108919020B
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- 230000001012 protector Effects 0.000 title claims abstract description 61
- 230000015556 catabolic process Effects 0.000 claims abstract description 54
- 238000007493 shaping process Methods 0.000 claims abstract description 45
- 238000005259 measurement Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 27
- 238000004088 simulation Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides a breakdown protector measuring system and a breakdown protector measuring instrument. The breakdown protector measuring system comprises a multi-waveform generator, a step-up transformer, a voltage doubling rectifying circuit and a shaping filter circuit; the step-up transformer, the voltage doubling rectifying circuit and the shaping filter circuit are connected in series; the high-voltage input end is connected with the multi-waveform generator, and the high-voltage output end is connected with the shaping filter circuit. The problem of the wave form that obtains when breakdown insurance detector detects the breakdown insurance simple, get the simulation actual overvoltage condition of method is solved. The step-up transformer, the voltage doubling rectifying circuit and the shaping filter circuit are connected in series, so that multi-wave simulation test high-voltage output is realized, the operation is simple and reliable, the waveform is complete and undistorted, the working state and the service life of the field breakdown protector are truly reflected, and the measured data are more accurate.
Description
Technical Field
The invention relates to the technical field of power detection equipment, in particular to a breakdown protector measuring system and a breakdown protector measuring instrument.
Background
The breakdown protector is one of lightning arresters, and is used for protecting the secondary side (low-voltage side) of the indoor and outdoor voltage transformer from overvoltage so as to prevent the secondary circuit from being connected with high voltage in series to cause voltage rise to cause damage to secondary equipment and human bodies; the high-voltage transformer can also be used for the low-voltage side of a power transformer to prevent the voltage of the low-voltage side from rising when breakdown occurs between a high-voltage coil and a low-voltage coil; or as an overvoltage protection gap of other electric equipment in the power grid, and is directly connected with the protected equipment in parallel when in use so as to limit the overvoltage on the protected equipment; the breakdown protector is generally connected between the non-grounded neutral point of the low-voltage side winding of the distribution transformer and the ground or between the phase line of the low-voltage power network and the ground, so as to prevent the potential rise of the low-voltage line caused by the lap joint of the 3-10KV high-voltage line and the low-voltage line under the fault and protect the personal safety.
The breakdown protector tester can detect whether the breakdown protector can work normally or not, judge whether the breakdown protector is qualified or not, and the existing breakdown protector tester obtains a simple alternating current high voltage through a step-up transformer to detect, and the result has no referential property because the waveform is simple and cannot completely simulate the complex overvoltage conditions (lightning stroke, coupling, spark, induction and the like) of the scene,
Disclosure of Invention
The invention aims to provide a breakdown protector measuring system, which is used for solving the problems that the waveform obtained when a breakdown protector detector detects a breakdown protector in the prior art is simple and the actual overvoltage condition is simulated by taking a method.
The invention aims to provide a breakdown protector measuring instrument, which solves the problem that a breakdown protector detector in the prior art cannot accurately simulate a complex overvoltage condition on site.
The invention provides a breakdown protector measuring system which comprises a multi-waveform generator, a step-up transformer, a voltage doubling rectifying circuit and a shaping filter circuit, wherein the step-up transformer is connected with the multi-waveform generator;
the step-up transformer, the voltage doubling rectifying circuit and the shaping filter circuit are connected in series;
The high-voltage input end is connected with the multi-waveform generator, and the high-voltage output end is connected with the shaping filter circuit.
Further, the multi-waveform generator further comprises a driving tube, wherein the driving tube is connected between the multi-waveform generator and the step-up transformer and used for amplifying and pushing the step-up transformer to step up.
Further, the turn ratio of the step-up transformer is 1:10 or 1:9 or 1:8.
Further, the shaping filter circuit includes an RLC filter circuit for adjusting the circuit R, L, C values to obtain different waveforms.
Further, the shaping filter circuit comprises a plurality of filter loops connected in parallel, so that different filter loops realize different waveform filtering shaping.
Further, the voltage doubling rectifying circuit comprises a transformer and N rectifying circuits which are connected in parallel;
the rectifying circuit comprises a rectifying diode and a capacitor which are connected in series and is used for rectifying the circuit doubly.
Further, the voltage doubling rectifying circuit further comprises a selection switch for adjusting the voltage doubling stage of the voltage passing through the voltage doubling rectifying circuit.
Further, the voltage doubling stage number of the voltage doubling rectifying circuit is 10.
Further, the multi-waveform generator is a single chip microcomputer.
The invention provides a breakdown protector measuring instrument, which comprises the breakdown protector measuring system.
According to the breakdown protector measuring system provided by the invention, the step-up transformer, the voltage doubling rectifying circuit and the shaping filter circuit are connected in series; the high-voltage input end is connected with the multi-waveform generator, and the high-voltage output end is connected with the shaping filter circuit; the step-up transformer, the voltage doubling rectifying circuit and the shaping filter circuit are connected in series, so that multi-wave simulation test high-voltage output is realized, the operation is simple and reliable, the waveform is complete and undistorted, the working state and the life expectancy of the field breakdown protector are truly reflected, and the measurement data are more accurate; the multi-waveform generator and the step-up transformer are arranged, so that the testing high-voltage adjustable range is wide, the waveform is rich and complete, the testing voltage and the testing current can be accurately adjusted, and the multi-waveform generator and the step-up transformer are suitable for various breakdown protectors with different types and grades; the test high voltage is output to the protector to be tested through the voltage doubling rectifying circuit and the shaping filter circuit, has higher impedance, can limit high-voltage current, can avoid accidental damage of the protector caused by the test high voltage under certain conditions (such as current protection failure, too slow response speed and the like), and has small high-voltage output internal resistance of a general tester, and is easy to damage caused by out-of-control test current; the breakdown protector measuring system has practical functions, simple circuit and strong anti-interference performance, and is suitable for complex electromagnetic environments of electric power.
The breakdown protector measuring instrument provided by the invention comprises the step-up transformer, the voltage doubling rectifying circuit and the shaping filter circuit of the breakdown protector measuring system which are connected in series, so that the multi-wave simulation test high-voltage output is realized, the operation is simple and reliable, the waveform is complete and undistorted, the working state and the service life of the on-site breakdown protector are truly reflected, and the measuring data are more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a breakdown protector measurement system provided by an embodiment of the present invention;
Fig. 2 is a circuit diagram of a breakdown protector measurement system according to an embodiment of the present invention.
Icon: 11-a multi-waveform generator; 12-step-up transformers; 13-voltage-doubler rectifying circuit; 14-shaping filter circuits; 15-driving tube; 131-rectifying circuit.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, as the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience in describing the present invention and simplifying the description based on the azimuth or positional relationship shown in the drawings, it should not be construed as limiting the present invention, but rather should indicate or imply that the devices or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.
In the description of the present invention, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
FIG. 1 is a block diagram of a breakdown protector measurement system provided by an embodiment of the present invention; fig. 2 is a circuit diagram of a breakdown protector measurement system according to an embodiment of the present invention.
1-2, The breakdown protector measuring system provided by the invention comprises a multi-waveform generator 11, a step-up transformer 12, a voltage doubling rectifying circuit 13 and a shaping filter circuit 14; the step-up transformer 12, the voltage doubling rectifying circuit 13 and the shaping filter circuit 14 are connected in series; the high voltage input end is connected with the multi-waveform generator 11, and the high voltage output end is connected with the shaping filter circuit 14.
The step-up transformer 12, the voltage doubling rectifying circuit 13 and the shaping filter circuit 14 are connected in series; the high-voltage input end is connected with the multi-waveform generator 11, and the high-voltage output end is connected with the shaping filter circuit 14; the step-up transformer 12, the voltage doubling rectifying circuit 13 and the shaping filter circuit 14 are connected in series, so that multi-wave simulation test high-voltage output is realized, the work is simple and reliable, the waveform is complete and undistorted, the working state and life expectancy of the field breakdown protector are truly reflected, and the measured data are more accurate; the multi-waveform generator 11 and the step-up transformer 12 are arranged, so that the wide adjustable range of the test high voltage is realized, the waveform is rich and complete, the test voltage and the current can be accurately adjusted, and the device is suitable for various breakdown protectors with different types and grades; the test high voltage is output to the protector to be tested through the voltage doubling rectifying circuit 13 and the shaping filter circuit 14, has higher impedance, can limit high-voltage current, can avoid accidental damage of the protector caused by the test high voltage under certain conditions (such as current protection failure, too slow response speed and the like), and has small high-voltage output internal resistance of a general tester, and is easy to damage caused by out-of-control test current; the breakdown protector measuring system has practical functions, simple circuit and strong anti-interference performance, and is suitable for complex electromagnetic environments of electric power.
The measuring waveform can simulate the field complex overvoltage waveform (sine wave, square wave, triangular wave, composite wave and the like) instead of the pure alternating current high voltage, so that the working state and the life expectancy of the field breakdown protector are reflected more truly.
The voltage-controllable waveform problem required in the test is solved through the step-up transformer 12 and the voltage-multiplying rectifying circuit 13, so that the test voltage and current can be accurately regulated, and the precision and the working efficiency are improved.
Further, a driving tube 15 is further included, and the driving tube 15 is connected between the multi-waveform generator 11 and the step-up transformer 12, and is used for amplifying and pushing the step-up transformer 12 to step up.
Through setting up drive tube 15 between multi-waveform generator 11 and step-up transformer 12, the amplification promotes step-up transformer 12 and steps up, reduces the influence of step-up transformer 12 inductance to the wave form, and step-up transformer primary side turns is less, and required drive power is big, has the isolation effect to make the wave form that obtains more complete, so that measurement accuracy is high.
Further, the turn ratio of the step-up transformer 12 is 1:10 or 1:9 or 1:8.
By setting the turn ratio of the step-up transformer 12 to 1:10 or 1:9 or 1:8, avoiding the situation that the number of turns of the secondary side is more and the inductance is large due to the fact that the purity of the waveform is seriously affected and distortion is generated.
The preferable turn ratio is 1:10, the inductance effect is reduced, the insufficient voltage is supplemented by the voltage doubling rectifying circuit 13, the optimal waveform is ensured, and the measurement accuracy is improved.
Further, the shaping filter circuit 14 includes an RLC filter circuit for adjusting the circuit R, L, C values to obtain different waveforms.
The RLC filter circuit is selected from the shaping filter circuit 14, so that the RLC filter circuit is reliable and simple in operation, is more suitable for being applied to a high-voltage circuit, achieves the purpose of shaping pulse multi-waveform high voltage after voltage doubling rectification, and is finely adjusted to R, L, C values of the RLC filter circuit to obtain different waveforms.
Further, the shaping filter circuit 14 includes a plurality of filter loops connected in parallel, so that different filter loops implement different waveform filtering shaping.
Different waveforms are shaped by the multiple parallel filter loops included in the shaping filter circuit 14; for different waveforms, different parallel loops (such as inverted L-shaped, LC filtering, LC & p-shaped filtering, RC pi-shaped filtering, different RLC values and the like) are arranged at the shaping filter circuit 14, and the filter circuit is selectively connected with the different loops to realize different waveform filtering shaping and increase the waveform restoring effect.
Wherein, the shaping filter can design independent filter loops for different waveforms (sine wave, square wave, triangular wave, composite wave and the like) so as to realize better waveform simulation.
Further, the voltage doubling rectifying circuit 13 includes a transformer and N rectifying circuits 131 connected in parallel; the rectifying circuit 131 includes a rectifying diode and a capacitor connected in series for double rectifying the circuit.
The voltage doubling rectifying circuit 13 includes a transformer and N rectifying circuits 131 connected in parallel; the rectifying circuit 131 includes a rectifying diode and a capacitor connected in series for double rectifying the circuit; the voltage of the step-up transformer 12 is doubly rectified by the transformer and the plurality of parallel rectifying circuits 131 including rectifying diodes and capacitors, and by the rectifying and guiding actions of the diodes, the voltages are respectively stored in the respective capacitors.
The N parallel rectifying circuits 131 rectify the voltage of the step-up transformer 12N times, meet the high voltage requirement, and realize the working state of the real reaction field breakdown protector.
The low transformation ratio step-up transformer 12 (the turn ratio should be less than 1:10) ensures that the secondary turns inductance effect is small without affecting the waveform integrity, the required high voltage is realized by voltage doubling rectification (generally 8-10 stages), and the shaping filter circuit 14 shapes the pulse multi-waveform high voltage after the voltage doubling rectification, so that the required complete analog test high voltage is obtained.
Further, the voltage doubler rectifying circuit 13 further includes a selection switch for adjusting the voltage doubler passing through the voltage doubler rectifying circuit 13.
A selector switch is arranged on the voltage doubling rectifying circuit 13 and is used for adjusting the voltage doubling stage of the voltage passing through the voltage doubling rectifying circuit 13; the selection switch of the voltage doubling stage is actually a selection switch of the voltage doubling rectification stage, so that the determination of 8 times voltage or 10 times voltage is conveniently carried out (the diode-capacitor boosting units of a plurality of groups of parallel rectification circuits 131 are disconnected), the multi-waveform simulation test high voltage in a larger range is realized, and the use effect is improved.
Further, the voltage doubling stage number of the voltage doubling rectifying circuit 13 is 10.
The voltage doubling stage number of the voltage doubling rectifying circuit 13 is selected to be 10, so that the shaping filter circuit 14 is used for shaping the pulse multi-waveform high voltage after voltage doubling rectification to obtain the required complete simulation test high voltage, and the measurement effect is improved.
The voltage doubling stage number of the voltage doubling rectifying circuit 13 is generally 8-10, and 10 stages are the preferred scheme.
Further, the multi-waveform generator 11 is a single chip microcomputer.
The multi-waveform generator 11 is composed of a single chip microcomputer, which is an integrated circuit chip, and integrates the functions of a central processing unit CPU, a random memory RAM, a read-only memory ROM, various I/O and terminal systems, a timer/counter and the like with data processing capacity onto a silicon chip by adopting a super-large-scale integrated circuit technology to form a small and perfect microcomputer system, and the multi-waveform generator has the advantages of small volume, powerful functions and capability of realizing the storage of various waveforms.
The multi-waveform generator 11 may be implemented by an application specific integrated chip or a separate element, and is preferably a single chip microcomputer.
The invention provides a breakdown protector measuring instrument, which comprises the breakdown protector measuring system.
The breakdown protector measuring instrument comprises a step-up transformer 12, a voltage doubling rectifying circuit 13 and a shaping filter circuit 14 which are connected in series, so that multi-wave simulation test high-voltage output is realized, the operation is simple and reliable, the waveform is complete and undistorted, the working state and life expectancy of the on-site breakdown protector are truly reflected, and the measured data are more accurate.
In summary, in the breakdown protector measuring system provided by the invention, the step-up transformer 12, the voltage doubling rectifying circuit 13 and the shaping filter circuit 14 are connected in series; the high-voltage input end is connected with the multi-waveform generator 11, and the high-voltage output end is connected with the shaping filter circuit 14; the step-up transformer 12, the voltage doubling rectifying circuit 13 and the shaping filter circuit 14 are connected in series, so that multi-wave simulation test high-voltage output is realized, the work is simple and reliable, the waveform is complete and undistorted, the working state and life expectancy of the field breakdown protector are truly reflected, and the measured data are more accurate; the multi-waveform generator 11 and the step-up transformer 12 are arranged, so that the wide adjustable range of the test high voltage is realized, the waveform is rich and complete, the test voltage and the current can be accurately adjusted, and the device is suitable for various breakdown protectors with different types and grades; the test high voltage is output to the protector to be tested through the voltage doubling rectifying circuit 13 and the shaping filter circuit 14, has higher impedance, can limit high-voltage current, can avoid accidental damage of the protector caused by the test high voltage under certain conditions (such as current protection failure, too slow response speed and the like), and has small high-voltage output internal resistance of a general tester, and is easy to damage caused by out-of-control test current; the breakdown protector measuring system has practical functions, simple circuit and strong anti-interference performance, and is suitable for complex electromagnetic environments of electric power.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. The breakdown protector measuring system is characterized by comprising a multi-waveform generator, a step-up transformer, a voltage doubling rectifying circuit and a shaping filter circuit;
the step-up transformer, the voltage doubling rectifying circuit and the shaping filter circuit are connected in series;
the high-voltage input end is connected with the multi-waveform generator, and the high-voltage output end is connected with the shaping filter circuit;
The driving pipe is connected between the multi-waveform generator and the step-up transformer and is used for amplifying and pushing the step-up transformer to step up;
The turn ratio of the step-up transformer is 1:10 or 1:9 or 1:8, 8;
The multi-waveform generator is a singlechip;
The shaping filter circuit comprises a plurality of parallel filter circuits so that different filter circuits realize different waveform filtering shaping, the parallel filter circuits comprise inverted L-shaped, LC filtering, LC & p-shaped filtering, RC pi-shaped filtering and RLC filtering circuits, and different waveforms comprise sine waves, square waves, triangular waves and composite waves.
2. The breakdown protector measurement system of claim 1, wherein the voltage doubler rectifier circuit comprises a transformer and N rectifier circuits connected in parallel;
the rectifying circuit comprises a rectifying diode and a capacitor which are connected in series and is used for rectifying the circuit doubly.
3. The breakdown protector measurement system of claim 2, wherein the voltage doubler rectification circuit further comprises a selector switch for adjusting the voltage doubler across the voltage doubler rectification circuit.
4. The breakdown protector measurement system of claim 2, wherein the voltage doubling stage number of the voltage doubling rectifying circuit is 10 stages.
5. A breakdown protector measurement instrument comprising a breakdown protector measurement system according to any one of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811146524.6A CN108919020B (en) | 2018-09-28 | 2018-09-28 | Puncture protector measuring system and puncture protector measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811146524.6A CN108919020B (en) | 2018-09-28 | 2018-09-28 | Puncture protector measuring system and puncture protector measuring instrument |
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| CN108919020A CN108919020A (en) | 2018-11-30 |
| CN108919020B true CN108919020B (en) | 2024-07-02 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08140351A (en) * | 1994-11-08 | 1996-05-31 | Canon Inc | Dc high voltage generator |
| CN204556748U (en) * | 2015-03-26 | 2015-08-12 | 张杨 | A kind of novel discharge protector detection system |
| CN208921802U (en) * | 2018-09-28 | 2019-05-31 | 广东电网有限责任公司 | Discharge protector measuring system and discharge protector measuring instrument |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100595597C (en) * | 2008-03-07 | 2010-03-24 | 中国电力科学研究院 | Lightning arrester various waveform aging test device |
| CN102355132B (en) * | 2011-09-06 | 2013-12-25 | 中国电子科技集团公司第二十四研究所 | Switching voltage doubling rectifier circuit with low-voltage input/high-voltage output in discontinued current mode |
| CN203872060U (en) * | 2014-04-02 | 2014-10-08 | 深圳市贵晶集成科技有限公司 | High voltage generator |
| CN104588215A (en) * | 2014-05-28 | 2015-05-06 | 吴镇海 | Method for applying high voltage through intelligently-controlled air purification apparatus, and air purification apparatus |
| CN107394999A (en) * | 2017-08-18 | 2017-11-24 | 广东美的制冷设备有限公司 | Method for controlling frequency conversion, frequency-converting control device and ion generator |
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2018
- 2018-09-28 CN CN201811146524.6A patent/CN108919020B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08140351A (en) * | 1994-11-08 | 1996-05-31 | Canon Inc | Dc high voltage generator |
| CN204556748U (en) * | 2015-03-26 | 2015-08-12 | 张杨 | A kind of novel discharge protector detection system |
| CN208921802U (en) * | 2018-09-28 | 2019-05-31 | 广东电网有限责任公司 | Discharge protector measuring system and discharge protector measuring instrument |
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