CN201892694U - High-voltage large-capacity impact voltage generator - Google Patents

High-voltage large-capacity impact voltage generator Download PDF

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Publication number
CN201892694U
CN201892694U CN2010205829827U CN201020582982U CN201892694U CN 201892694 U CN201892694 U CN 201892694U CN 2010205829827 U CN2010205829827 U CN 2010205829827U CN 201020582982 U CN201020582982 U CN 201020582982U CN 201892694 U CN201892694 U CN 201892694U
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CN
China
Prior art keywords
voltage
wave
electric capacity
voltage generator
harmonic
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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CN2010205829827U
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Chinese (zh)
Inventor
万启发
徐涛
杨鹏程
谢梁
叶奇明
霍锋
周平
文志斌
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WUHAN HUAGAO HIGH VOLTAGE EQUIPMENT NEW TECHNOLOGY Co Ltd
State Grid Electric Power Research Institute
Original Assignee
WUHAN HUAGAO HIGH VOLTAGE EQUIPMENT NEW TECHNOLOGY Co Ltd
State Grid Electric Power Research Institute
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Priority to CN2010205829827U priority Critical patent/CN201892694U/en
Application granted granted Critical
Publication of CN201892694U publication Critical patent/CN201892694U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model relates to a high-voltage large-capacity impact voltage generator, comprising charging capacitors, wave-head resistors, wave-tail resistors, a voltage divider, a load and a sphere gap, wherein a plurality of impact voltage generating units, which is respectively formed by the charging capacitor, the wave-head resistor and the wave-tail resistor, are arranged; the wave-head resistors are arranged in a discharging circuit. The high-voltage large-capacity impact voltage generator is characterized in that in partially or wholly impact voltage generating units, the two ends of the wave-head resistors are provided with wave modulating capacitors in parallel. In the high-voltage large-capacity impact voltage generator, the defect that a wave modulating resistor in the traditional method can not generate standard lightning surge, the adverse effect generated due to stray inductance can be effectively restricted, and the standard lightning surge voltage is generated; and the high-voltage large-capacity impact voltage generator can generate standard lightning impact by only needing to add fewer elements on the basis of the existing equipment, and has the advantages that the volume is small, and the cost is low and the like.

Description

The high voltage large capcity impulse voltage generator
Technical field
The utility model belongs to the high voltage large capcity impulse voltage generator in High-Voltage Experimentation Technology field, is specifically related to the harmonic problem of its lightning impulse voltage.
Background technology
Along with China's rapid development of economy, power industry needs constantly to build to satisfy the demand of economic development, and for reaching the target of national energy-saving and emission-reduction, the electric pressure of operation of power networks has risen to the extra-high voltage grade by UHV (ultra-high voltage) simultaneously.At present, the extra-high voltage alternating current-direct current engineering of China is in Rapid development stage, and extra-high voltage means higher working voltage, need carry out a large amount of experiment works to electrical network and the normal operation of equipment, for actual engineering provides design reference and support.Because extra-high voltage poles and towers is higher, be very easy to be struck by lightning, therefore the research that line thunder protection is hit flashover property has crucial meaning in extra-high voltage engineering design and process of construction.The relevant operating experience of extra-high voltage system is in the world all seldom carried out a large amount of lightning impulse tests so need set up the high-tension experimental provision of a cover to extra-high voltage equipment.But China does not also have to produce the equipment of the above standard lightning impulse voltage of 5000kV at present, has caused bigger obstacle for the propelling of extra-high voltage engineering design.
The principle of work of impulse voltage generator is multistage electric capacity charged in parallel, and discharged in series then is to reach the purpose that produces impacting with high pressure.If produce the above lightning impulse of 5000kV, need to install tens groups of electric capacity in the surge generator, the size of whole generator can be very big.Excessive equipment size has caused that stray parameter impact waveform has very big influence in the discharge loop, and especially for lightning impulse, stray inductance can produce comparatively serious vibration in discharge process, can not produce to meet the waveform that GB requires.In traditional lightning impulse generator, the lightning impulse waveform that normally utilizes the adjustment of wave head wave rear resistance to produce, and this method can't suppress because the vibration that stray inductance produces, so this method and inapplicable in the large-sized lightning impulse generator of present high voltage can't only utilize wave regulating resistor to produce standard lightning impulse.For example the 7200kV of Chinese DianKeYuan impacts generating means, has adopted traditional resistance harmonic method, and the lightning impulse wavefront time of its generation is 2.3 μ s, far above required standard lightning impulse wavefront time in the GB (1.2 μ s ± 30%).
Summary of the invention
Widespread use along with high voltage large capcity lightning impulse generator, stray inductance becomes the principal element that influences the lightning impulse waveform, and the resistance harmonic method of traditional lightning impulse voltage can't suppress the adverse effect that stray inductance is brought, so can't produce standard lightning impulse in this kind equipment.The utility model purpose is to provide a kind of new high voltage large capcity impulse voltage generator, by harmonic, effectively suppresses the vibration that stray inductance produces, and produces to meet GB required standard lightning impulse.
The technical scheme that its technical matters that solves the utility model adopts is: the high voltage large capcity impulse voltage generator, it comprises charging capacitor, wave front resistance, wave rear resistance, voltage divider, load and ball crack, a plurality of surge voltage generating units that are made of charging capacitor, wave front resistance, wave rear resistance are arranged, wave front resistance is installed in the discharge loop, it is characterized in that: in part or all of surge voltage generating unit, be installed in parallel harmonic electric capacity at the wave front resistance two ends.
Harmonic electric capacity can effectively compensate stray inductance in the discharge loop to the influence of lightning impulse waveform, suppresses because the vibration of the generation of stray inductance and effectively reducing the wavefront time.After harmonic electric capacity is installed, can utilizes large scale to impact generating means and produce the standard lightning impulse that meets GB.
Aforesaid high voltage large capcity impulse voltage generator, it is characterized in that: the harmonic electric capacity of employing can be pure capacitance, the assembly that also can be electric capacity and resistance (for example is fitted together electric capacity and resistive seal, whole as an adjusting component for impulse) or electric capacity and other combination of elements bodies (for example combination of combination between the electric capacity of two groups of different capabilities or electric capacity and voltage divider, its effect is the same with the independent capacitive effect of installing).
Aforesaid high voltage large capcity impulse voltage generator is characterized in that: the harmonic electric capacity of employing can use dry type electric capacity, or oil immersed type electric capacity, perhaps other forms of electric capacity.(for example MKK, MKP capacitor, effect is the same with preceding two kinds of electric capacity)
Adopt above-mentioned high voltage large capcity impulse voltage generator, the impact voltage generator carries out the thunder and lightning harmonic, and concrete steps are as follows:
1) technical scheme by invention makes up the high voltage large capcity impulse voltage generator;
2) check that whether site safety measure and the wiring of impact generating means be correct, checks whether wave front resistance, wave rear resistance and the installation of harmonic electric capacity be correct, checks whether ground wire connects fully;
3) insert power supply, examine the on-the-spot back of installing and prepare pressurization.
4) set charging voltage, carry out impulse test.If test waveform does not meet standard-required, adjust wave front resistance and harmonic electric capacity after the step-down ground connection; As the requirement of test waveform conformance with standard, setting voltage carries out the standard lightning impulse test to test product.
Beneficial effect: after adopting this harmonic apparatus and method, can utilize high capacity high voltage surge generator to produce standard lightning impulse voltage, can provide the support of standard lightning impulse experimental technique to the extra-high voltage engineering.This device volume is little, and cost is low, only needs to increase a small amount of harmonic electric capacity and can produce standard lightning impulse voltage on existing Equipment Foundations.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Fig. 2 is the positive polarity lightning impulse waveform that the utility model is implemented generation.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Description of symbols among Fig. 1: main capacitance 1, harmonic electric capacity 2, wave front resistance 3, wave rear resistance 4, voltage divider 5, load 6, ball crack 7.
Referring to Fig. 1, harmonic electric capacity 2 is in parallel with wave front resistance 3, and discharge loop links to each other with load 6 one ends with voltage divider 5.After main capacitance 1 charging finishes, utilize direct current to trigger ball crack 7 is punctured synchronously, main capacitance 1 discharges to voltage divider 5 and load 6 by wave front resistance 3, wave rear resistance 4 and harmonic electric capacity 2.
Below be to utilize thunder and lightning harmonic device and method of the present utility model that state's net DianKeYuan 7500kV impulse voltage generator is carried out the test of thunder and lightning harmonic.
According to the initial stage design proposal, original wave regulating resistor is 17 in this thunder and lightning harmonic, and 50 of main capacitances are newly made 50 of wave regulating resistors, 25 of harmonic electric capacity, thunder and lightning wave front resistance 18 Ω * 42 wherein, harmonic electric capacity 17nF * 25, wave rear resistance 100 Ω * 25.On existing Equipment Foundations, design multiple harmonic scheme, 7500kV surge generator lightning impulse waveform is adjusted optimization.
Debug in uneasiness that the impact generator carries out the thunder and lightning harmonic under the situation of ripple electric capacity, after whole wave head wave rear resistance are installed, the lightning impulse wavefront time is 2.6 μ s, adjust the wave front resistance value, the minimum 1.54 μ s that reduce to of wavefront time, produce but have bigger vibration in the loop, overshoot has surpassed the GB requirement.Only utilize wave head wave rear resistance can't produce the standard lightning impulse shape that meets GB.
Carry out impact experiment after being mounted to harmonic electric capacity on the surge generator, the value that changes harmonic electric capacity and wave front resistance is to seek best harmonic effect.The result is as shown in table 1
Table 1 thunder and lightning harmonic data
Scheme Harmonic electric capacity quantity Wavefront time/μ s Overshoot
1 25 1.88 7%
2 23 1.54 10%
3 21 1.51 10%
4 20 1.38 10%
5 17 1.60 8%
6 15 1.40 5%
The result of several debugging schemes is comparatively satisfied, chooses scheme 4 at last as final harmonic scheme.
Utilize the harmonic result of scheme 4 to carry out the lightning impulse experiment, 20 groups of lightning impulse experiments are carried out in lead tower leg 7m gap, 20 groups of experimental waveforms all satisfy the GB requirement.

Claims (3)

1. high voltage large capcity impulse voltage generator, it comprises charging capacitor, wave front resistance, wave rear resistance, voltage divider, load and ball crack, a plurality of surge voltage generating units that are made of charging capacitor, wave front resistance, wave rear resistance are arranged, wave front resistance is installed in the discharge loop, it is characterized in that: in part or all of surge voltage generating unit, be installed in parallel harmonic electric capacity at the wave front resistance two ends.
2. high voltage large capcity impulse voltage generator according to claim 1 is characterized in that: the harmonic electric capacity of employing can be single electric capacity, or the combination between the electric capacity of two groups of different capabilities, perhaps the combination of electric capacity and voltage divider.
3. high voltage large capcity impulse voltage generator according to claim 1 and 2 is characterized in that: the harmonic electric capacity of employing is dry type electric capacity, or oil immersed type electric capacity, or MKK, MKP capacitor.
CN2010205829827U 2010-10-29 2010-10-29 High-voltage large-capacity impact voltage generator Expired - Lifetime CN201892694U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN201892694U true CN201892694U (en) 2011-07-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101988933A (en) * 2010-10-29 2011-03-23 国网电力科学研究院 High-voltage high-capacity impulse voltage generator
CN105137136A (en) * 2015-09-17 2015-12-09 湖北工业大学 High-voltage high-capacity impulse voltage generator with low structure inductance
CN105353279A (en) * 2015-11-12 2016-02-24 中国电力科学研究院 Self-support fast-assembling type impact voltage generator and installation method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101988933A (en) * 2010-10-29 2011-03-23 国网电力科学研究院 High-voltage high-capacity impulse voltage generator
CN105137136A (en) * 2015-09-17 2015-12-09 湖北工业大学 High-voltage high-capacity impulse voltage generator with low structure inductance
CN105137136B (en) * 2015-09-17 2017-12-08 湖北工业大学 A kind of high-voltage high-capacity impulse of low structure inductance
CN105353279A (en) * 2015-11-12 2016-02-24 中国电力科学研究院 Self-support fast-assembling type impact voltage generator and installation method thereof
CN105353279B (en) * 2015-11-12 2021-04-30 中国电力科学研究院 Self-supporting quick-mounting impulse voltage generator and mounting method thereof

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Granted publication date: 20110706