CN104297647A - Controllable power frequency superposition impulse testing device and testing method thereof - Google Patents
Controllable power frequency superposition impulse testing device and testing method thereof Download PDFInfo
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- CN104297647A CN104297647A CN201410550645.2A CN201410550645A CN104297647A CN 104297647 A CN104297647 A CN 104297647A CN 201410550645 A CN201410550645 A CN 201410550645A CN 104297647 A CN104297647 A CN 104297647A
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Abstract
The invention discloses a controllable power frequency superposition impulse testing device and a testing method of the testing device. The testing device is characterized by being composed of an impulse voltage generator (1), a power frequency voltage generating device (2), a coupling capacitor (3), a tested object (4) and an automatic ignition device (5). The output end of the impulse voltage generator (1) is connected with the input end of the coupling capacitor (3). The output end of the coupling capacitor (3) is connected with the output end of the power frequency voltage generating device (2) and the high-voltage end of the tested object (4). The input end of the automatic ignition device (5) is connected with the one-time side of a power frequency side voltage adjusting device (17). The output end of the automatic ignition device (5) is connected with the grounding end of an ignition sphere gap (10) of the impulse voltage generator (1). According to the method, actual overvoltage occurring in an electrical power system can be simulated, it can be ensured that waveforms of impulse voltage acting on the high-voltage end of the tested object do not distort, the phase position impacted and superposed to power frequency can be controlled and adjusted, and the power frequency voltage can be prevented from jumping to the impulse voltage generator.
Description
Technical field
The present invention relates to a kind of controlled industrial frequency superimposed impact test apparatus and test method thereof, belong to high-voltage insulation technique field.
Background technology
Due to the implementation of urban distribution network robotization, switching manipulation is more and more frequent, electric system and intrasystem various equipment frequently suffer the impact of switching overvoltage, there is the joint line of overhead transmission line and underground cable in the net of part city simultaneously, also can suffer lightning surge, all will bring serious harm to underground cable and electrical equipment.
Chinese patent 201210195050.0 " method for high altitude localities power frequency and impulse superposition voltage test " adopts high_voltage isolation ball gap by Impulse Voltage to test specimen, realizes superposing of power frequency and impact; Chinese patent 201110108141.1 " interchange of High aititude Transmission level, direct current, combined impulse repeated addition voltage test method " adopts protection ball gap by Impulse Voltage to test specimen, and realization is impacted and exchanged, impacts with direct current, impacts and direct current and the superposition exchanged; Chinese patent 201220626064.9 " anti-power-frequency voltage scurries into impulse voltage generator system " adopts two batching sphere gaps to add a fan to prevent power-frequency voltage from scurrying into impulse voltage generator; But above-mentioned technology has following deficiency: (1), when ball gap does not puncture by surge voltage, surge voltage cannot pass through ball gap, makes waveform distort to some extent; (2) adopting two batching sphere gaps to add a fan prevents power-frequency voltage from scurrying into impulse voltage generator, and synchronously puncturing of two ball gaps is more difficult; (3) phase place not realizing impacting the power frequency that is added to controlled, adjustable.
Summary of the invention
A kind of controlled industrial frequency superimposed impact test apparatus that theres is provided for the deficiencies in the prior art and test method thereof are provided, be characterized in that the surge voltage being applied to test specimen high-pressure side is undistorted, the phase place of impacting the power frequency that is added to is controlled, adjustable, prevents power-frequency voltage from scurrying into impulse voltage generator.
Object of the present invention is realized by following technical measures
Controlled industrial frequency superimposed impact test apparatus is made up of impulse voltage generator, power-frequency voltage generation device, coupling capacitance, test specimen, automatic ignition device, impulse voltage generator output terminal is connected with coupling capacitance input end, coupling capacitance output terminal is connected with power-frequency voltage generation device output terminal and test specimen high-pressure side, automatic ignition device input end is connected with power frequency side pressure regulator primary side, and automatic ignition device output terminal is connected with the earth terminal of the ignition pill gap of impulse voltage generator.
Impulse voltage generator by impacting side pressure regulator, impact side Industrial Frequency Transformer, impact side protective resistance, high voltage silicon rectifier stack, ignition pill gap, impact electric capacity, wave terminal resistance, wave front resistance, load capacitance formed; power-frequency voltage generation device is by power frequency side pressure regulator, and power frequency side Industrial Frequency Transformer, power frequency side protective resistance formed.
Automatic ignition device is made up of voltage acquisition unit, signal processing unit, single-chip microcomputer, signaling control unit, high-voltage pulse generation unit.
The method that controlled industrial frequency superimposed impact test apparatus carries out testing comprises the following steps:
1) selected required power-frequency voltage and surge voltage amplitude and impact are added to the phase place of power frequency, are connected to by voltage divider-oscillograph the voltage waveform that test specimen high-pressure side monitors test specimen high-pressure side;
2) power frequency side protective resistance and power frequency side Industrial Frequency Transformer are disconnected, meet by the distance of point of adjustment fireball gap the surge voltage amplitude being applied to test specimen high-pressure side;
3) connecting line of disconnection is connected again, the amplitude of power-frequency voltage is adjusted to certain amplitude, then the distance of the ignition pill gap of impulse voltage generator is adjusted to ignition pill gap automatically puncture and the critical voltage do not punctured;
4) automatic ignition device power supply is connected, regulate trigger delay angle to make it to meet and impact the phase requirements of power frequency of being added to by single-chip microcomputer, the high level time of regulable control signal controls duration that high-voltage pulse generation unit produces high-voltage pulse to be made it to meet ignition pill gap single and triggers igniting;
5) after having tested, first disconnect the power supply of automatic ignition device, then by the pressure regulator back to zero of impulse voltage generator, the pressure regulator back to zero of power-frequency voltage generation device, bleeds off the residual charge impacting electric capacity.
Tool of the present invention has the following advantages:
Be connected by coupling capacitance between impulse voltage generator with power-frequency voltage generation device, can ensure that the High Voltage Impulse Waveform that impulse voltage generator produces does not distort after coupling capacitance, thus act on test specimen high-pressure side.
Build impulse voltage generator voluntarily, facilitate coordinating between load capacitance with coupling capacitance, prevent power-frequency voltage from scurrying into impulse voltage generator.
The output terminal contact fireball gap earth terminal of automatic ignition device, can avoid surge voltage to invade in automatic ignition device, thus protection automatic ignition device.
Automatic ignition device by mcu programming, thus controls high-tension pulse and brings trigger point fireball gap and automatically puncture, and realizes the controlled, adjustable of the phase place of impacting the power frequency that is added to.
Accompanying drawing explanation
Fig. 1 is the controlled industrial frequency superimposed impact test apparatus schematic diagram of the present invention
Fig. 2 is the structured flowchart of the automatic ignition device in the controlled industrial frequency superimposed impact test apparatus of the present invention
1, impulse voltage generator, 2, power-frequency voltage generation device, 3, coupling capacitance, 4, test specimen, 5, automatic ignition device, 6, impact side pressure regulator, 7, impact side Industrial Frequency Transformer, 8, impact side protective resistance, 9, high voltage silicon rectifier stack, 10, ignition pill gap, 11, impact electric capacity, 12, wave terminal resistance, 13, wave front resistance, 14, load capacitance, 15, power frequency side protective resistance, 16, power frequency side Industrial Frequency Transformer, 17, power frequency side pressure regulator, 18, voltage acquisition unit, 19, signal processing unit, 20, single-chip microcomputer, 21, signaling control unit, 22, high-voltage pulse generation unit.
Embodiment
Below by embodiment, the present invention is specifically described: what be necessary to herein means out is that the present embodiment is only used to further illustrate the present invention, and can not be interpreted as limiting the scope of the invention.The person skilled in the art in this field can make some nonessential improvement and adjustment according to the content of the invention described above.
Embodiment
Controlled industrial frequency superimposed impact test apparatus as shown in Figure 1, this device is made up of impulse voltage generator 1, power-frequency voltage generation device 2, coupling capacitance 3, test specimen 4, automatic ignition device 5, wherein impulse voltage generator 1 output terminal is connected with coupling capacitance 3 input end, coupling capacitance 3 output terminal is connected with power-frequency voltage generation device 2 output terminal, test specimen 4 high-pressure side, automatic ignition device 5 input end is connected with power frequency side pressure regulator 17 primary side, and automatic ignition device 5 output terminal is connected with the earth terminal of the ignition pill gap 10 of impulse voltage generator 1.
Impulse voltage generator 1 is made up of impact side pressure regulator 6, impact side Industrial Frequency Transformer 7, impact side protective resistance 8, high voltage silicon rectifier stack 9, ignition pill gap 10, impact electric capacity 11, wave terminal resistance 12, wave front resistance 13, load capacitance 14, and power-frequency voltage generation device 2 is made up of power frequency side pressure regulator 17, power frequency side Industrial Frequency Transformer 16, power frequency side protective resistance 15.
Automatic ignition device 5 is made up of voltage acquisition unit 18, signal processing unit 19, single-chip microcomputer 20, signaling control unit 21, high-voltage pulse generation unit 22.
The wave head that this device uses, wave terminal resistance are noninductive resistance; the electric capacity used is for impacting electric capacity; the protective resistance used is water resistance; the pressure regulator used, transformer, single-chip microcomputer etc. are mill run, and wherein the parameter of various element requires and the decision of test specimen parameter according to the amplitude of the impact of test and power-frequency voltage.It is specifically intended that change surge voltage amplitude, i.e., during the distance of point of adjustment fireball gap, ensure that the residual charge impacting electric capacity bleeds off.
The method that controlled industrial frequency superimposed impact test apparatus carries out testing comprises the following steps:
1) selected required power-frequency voltage and surge voltage amplitude and impact are added to the phase place of power frequency, are connected to by voltage divider-oscillograph the voltage waveform that test specimen 4 high-pressure side monitors test specimen high-pressure side;
2) power frequency side protective resistance 15 and power frequency side Industrial Frequency Transformer 16 are disconnected, meet by the distance of point of adjustment fireball gap 10 the surge voltage amplitude being applied to test specimen 4 high-pressure side;
3) connecting line of disconnection is connected again, by regulating power frequency side pressure regulator 17 that the amplitude of power-frequency voltage is adjusted to selected amplitude, more automatically puncture and the critical voltage value do not punctured by regulating impact side pressure regulator 6 that the distance of the ignition pill gap 10 of impulse voltage generator 1 is adjusted to it;
4) automatic ignition device 5 power supply is connected, trigger delay angle is regulated to make it to meet the phase requirements impacting the power frequency that is added to by single-chip microcomputer 20, the high level time of regulable control signal controls the duration that high-voltage pulse generation unit 22 produces high-voltage pulse, makes it to meet ignition pill gap 10 single and triggers igniting;
5) after having tested, first disconnect the power supply of automatic ignition device 5, then side pressure regulator 6 back to zero will be impacted, power frequency side pressure regulator 17 back to zero, the residual charge impacting electric capacity 11 is bled off.
Claims (4)
1. controlled industrial frequency superimposed impact test apparatus, it is characterized in that this device is by impulse voltage generator (1), power-frequency voltage generation device (2), coupling capacitance (3), test specimen (4), automatic ignition device (5) is formed, impulse voltage generator (1) output terminal is connected with coupling capacitance (3) input end, coupling capacitance (3) output terminal is connected with power-frequency voltage generation device (2) output terminal and test specimen (4) high-pressure side, automatic ignition device (5) input end is connected with power frequency side pressure regulator (17) primary side, automatic ignition device (5) output terminal is connected with the earth terminal of the ignition pill gap (10) of impulse voltage generator (1).
2. industrial frequency superimposed impact test apparatus controlled as claimed in claim 1, is characterized in that impulse voltage generator (1) is made up of impact side pressure regulator (6), impact side Industrial Frequency Transformer (7), impact side protective resistance (8), high voltage silicon rectifier stack (9), ignition pill gap (10), impact electric capacity (11), wave terminal resistance (12), wave front resistance (13), load capacitance (14).
3. industrial frequency superimposed impact test apparatus controlled as claimed in claim 1, is characterized in that automatic ignition device (5) is made up of voltage acquisition unit (18), signal processing unit (19), single-chip microcomputer (20), signaling control unit (21), high-voltage pulse generation unit (22).
4. use industrial frequency superimposed impact test apparatus controlled as described in one of claims 1 to 3 to carry out the method tested, it is characterized in that the method comprises the following steps:
1) selected required power-frequency voltage and surge voltage amplitude and impact are added to the phase place of power frequency, are connected to by voltage divider-oscillograph the voltage waveform that test specimen (4) high-pressure side monitors test specimen high-pressure side;
2) power frequency side protective resistance (15) and power frequency side Industrial Frequency Transformer (16) are disconnected, meet by the distance of point of adjustment fireball gap (10) the surge voltage amplitude being applied to test specimen (4) high-pressure side;
3) connecting line of disconnection is connected again, by regulating power frequency side pressure regulator (17) that the amplitude of power-frequency voltage is adjusted to selected amplitude, more automatically puncture and the critical voltage value do not punctured by regulating impact side pressure regulator (6) that the distance of the ignition pill gap (10) of impulse voltage generator (1) is adjusted to it;
4) automatic ignition device (5) power supply is connected, trigger delay angle is regulated to make it to meet the phase requirements impacting the power frequency that is added to by single-chip microcomputer (20), the high level time of regulable control signal controls the duration that high-voltage pulse generation unit (22) produces high-voltage pulse, makes it to meet ignition pill gap (10) single and triggers igniting;
5) after having tested, first disconnect the power supply of automatic ignition device (5), then will impact side pressure regulator (6) back to zero, power frequency side pressure regulator (17) back to zero, bleeds off the residual charge impacting electric capacity (11).
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372463A (en) * | 2015-11-25 | 2016-03-02 | 国家电网公司 | Capacitive graded compact impulse voltage generator |
| CN105589019A (en) * | 2016-01-25 | 2016-05-18 | 西安交通大学 | Study of SF under AC superimposed impulse voltage6Gas discharge characteristic method and apparatus |
| CN106526476A (en) * | 2016-12-21 | 2017-03-22 | 国家电网公司 | Power-flow current breaking capacity test synthetic circuit synchronous control device and method |
| CN107121626A (en) * | 2017-05-27 | 2017-09-01 | 哈尔滨理工大学 | A kind of production method of peak values of ac superimposed pulse Resonant High Voltage |
| CN107271739A (en) * | 2017-07-19 | 2017-10-20 | 国网湖南省电力公司 | A kind of primary side protection circuit of 10kV power frequency continued flows experimental rig |
| CN107505553A (en) * | 2017-08-29 | 2017-12-22 | 国网湖南省电力公司 | A kind of power frequency continued flow experimental rig and its application method |
| CN108152686A (en) * | 2017-12-12 | 2018-06-12 | 山东电力设备有限公司 | A kind of low voltage impulse experimental rig of transformer coil |
| CN108169640A (en) * | 2017-12-29 | 2018-06-15 | 中国电力科学研究院有限公司 | One kind is based on gas isolated combined high-voltage generating means and method |
| CN108387827A (en) * | 2018-04-23 | 2018-08-10 | 天津大学 | A kind of electric branch characteristic test device under industrial frequency superimposed harmonic voltage and method |
| CN108896882A (en) * | 2018-06-28 | 2018-11-27 | 四川大学 | Overhead transmission line icing flashover influence factor appraisal procedure under impact and industrial frequency superimposed voltage |
| CN108896883A (en) * | 2018-06-28 | 2018-11-27 | 四川大学 | Arcing fault simulator and analogy method of the overhead transmission line under surge voltage |
| CN108896870A (en) * | 2018-06-28 | 2018-11-27 | 四川大学 | Fault recognition method for electric transmission line under power frequency and combined impulse effect |
| CN109581113A (en) * | 2018-12-11 | 2019-04-05 | 武汉水院电气有限责任公司 | A kind of multi-chamber clearance lightning-proof device power frequency continued flow breaking capacity test circuit |
| CN110398675A (en) * | 2019-07-17 | 2019-11-01 | 中国电力科学研究院有限公司 | A kind of method and system for the measurement to power frequency and impact superimposed voltage waveform |
| CN111830299A (en) * | 2019-04-16 | 2020-10-27 | 段小嬿 | Novel cascade protection device of coupling test power frequency transformer |
| CN112345903A (en) * | 2020-10-29 | 2021-02-09 | 中国电力科学研究院有限公司 | Voltage generating device and method for power frequency superimposed impulse voltage |
-
2014
- 2014-10-16 CN CN201410550645.2A patent/CN104297647B/en active Active
Non-Patent Citations (5)
| Title |
|---|
| 周凯: "中压电缆终端高频电热老化试验装置的研制及分析", 《电工电能新技术》 * |
| 张小福: "工频电压对污秽玻璃绝缘子冲击闪络特性影响的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 徐肖伟: "绝缘子工频叠加冲击电压下的放电特性", 《云南电力技术》 * |
| 朱胜龙: "36kV标准雷电波冲击电压发生器的研制", 《电工技术杂志》 * |
| 陈文鍼，黄镜明: "用冲击电压发生器产生操作冲击电压波的若干问题", 《高压电技术》 * |
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| CN105372463B (en) * | 2015-11-25 | 2017-11-24 | 国家电网公司 | Capacitance grading formula compact impulse voltage generator |
| CN105372463A (en) * | 2015-11-25 | 2016-03-02 | 国家电网公司 | Capacitive graded compact impulse voltage generator |
| CN105589019A (en) * | 2016-01-25 | 2016-05-18 | 西安交通大学 | Study of SF under AC superimposed impulse voltage6Gas discharge characteristic method and apparatus |
| CN106526476A (en) * | 2016-12-21 | 2017-03-22 | 国家电网公司 | Power-flow current breaking capacity test synthetic circuit synchronous control device and method |
| CN106526476B (en) * | 2016-12-21 | 2023-11-10 | 国家电网公司 | Synchronous control device and method for power frequency follow current interruption capability test synthesis loop |
| CN107121626B (en) * | 2017-05-27 | 2019-10-25 | 哈尔滨理工大学 | A kind of production method of peak values of ac superimposed pulse Resonant High Voltage |
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| CN107505553A (en) * | 2017-08-29 | 2017-12-22 | 国网湖南省电力公司 | A kind of power frequency continued flow experimental rig and its application method |
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| CN108169640A (en) * | 2017-12-29 | 2018-06-15 | 中国电力科学研究院有限公司 | One kind is based on gas isolated combined high-voltage generating means and method |
| CN108387827A (en) * | 2018-04-23 | 2018-08-10 | 天津大学 | A kind of electric branch characteristic test device under industrial frequency superimposed harmonic voltage and method |
| CN108896882A (en) * | 2018-06-28 | 2018-11-27 | 四川大学 | Overhead transmission line icing flashover influence factor appraisal procedure under impact and industrial frequency superimposed voltage |
| CN108896870A (en) * | 2018-06-28 | 2018-11-27 | 四川大学 | Fault recognition method for electric transmission line under power frequency and combined impulse effect |
| CN108896882B (en) * | 2018-06-28 | 2019-11-12 | 四川大学 | Overhead transmission line icing flashover influence factor appraisal procedure under impact and industrial frequency superimposed voltage |
| CN108896883A (en) * | 2018-06-28 | 2018-11-27 | 四川大学 | Arcing fault simulator and analogy method of the overhead transmission line under surge voltage |
| CN109581113A (en) * | 2018-12-11 | 2019-04-05 | 武汉水院电气有限责任公司 | A kind of multi-chamber clearance lightning-proof device power frequency continued flow breaking capacity test circuit |
| CN111830299A (en) * | 2019-04-16 | 2020-10-27 | 段小嬿 | Novel cascade protection device of coupling test power frequency transformer |
| CN110398675A (en) * | 2019-07-17 | 2019-11-01 | 中国电力科学研究院有限公司 | A kind of method and system for the measurement to power frequency and impact superimposed voltage waveform |
| JP2022538874A (en) * | 2019-07-17 | 2022-09-06 | 中国電力科学研究院有限公司 | Method and system for measuring superimposed voltage waveform of commercial voltage and impulse voltage |
| JP7308306B2 (en) | 2019-07-17 | 2023-07-13 | 中国電力科学研究院有限公司 | Method and system for measuring superimposed voltage waveform of commercial voltage and impulse voltage |
| CN112345903A (en) * | 2020-10-29 | 2021-02-09 | 中国电力科学研究院有限公司 | Voltage generating device and method for power frequency superimposed impulse voltage |
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