CN101251570A - Long wave front operation impulse voltage generator - Google Patents
Long wave front operation impulse voltage generator Download PDFInfo
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- CN101251570A CN101251570A CNA200810047117XA CN200810047117A CN101251570A CN 101251570 A CN101251570 A CN 101251570A CN A200810047117X A CNA200810047117X A CN A200810047117XA CN 200810047117 A CN200810047117 A CN 200810047117A CN 101251570 A CN101251570 A CN 101251570A
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Abstract
A long wavefront switching impulse voltage generator is characterized in that: a charging resistance 1, a main capacitor 3, an igniter 4, a wave tail resistance 9, a main capacitor 11 and a charging resistance 10 are connected in series and are used as the primary unit of an impulse generator; a charging switch 2 is connected between two stages and is respectively connected with one end of the charging resistance of each stage; moreover, both ends of each stage are respectively connected with a charging switch; one end of a wave head resistance 5 is connected between the wave tail resistance 9 and the main capacitor 11 of the current stage, while the other end is connected between the wave tail resistance 9 and the main capacitor 3; the units of the impulse generator have at least twelve stages. The generator can generate 1,000 to 2,500 mu s long wavefront time switching impulse voltage with the wavefront time and amplitude meeting the requirements of ultra-high voltage power transmission test. The application of the generator is of great significance to the research of the air insulation characteristics under various waveforms generated by switching overvoltage; moreover, the generator not only improves the transmission capacity of a circuit and reduces the wave impedance of the circuit, but also reduces the construction cost of the circuit.
Description
Technical field
The present invention relates to operation impulse voltage generator, can produce the operating impulse voltage that satisfies extra-high voltage test needs of wavefront times 250 μ s-2500 μ s, it is applicable to and carries out the electrical test of UHV transmission line clearance, equipment outer insulation test, the also extensible 750kV that is used in, the similar test of 500kV.
Background technology
Long apart from the large capacity transmission circuit, it is relevant with line parameter circuit value, length and system's constitution state to produce superpotential waveform during operation, especially the UHV transmission line of hundred ten thousand volts, the wavefront time of switching overvoltage may reach thousands of μ s, if at this moment still only continue to use the external insulation test that the switching impulse waveform of critical wavefront time carries out the clearance, with the actual conditions difference increasing of system.
For guaranteeing the reliability and the economy of UHV transmission line, the over-voltage waveform of generation is close in the waveform that trial voltage is wished in operating impulse voltage test and the system, the time operating impulse voltage just shows long importance apart from the test of UHV transmission line external insulation before the long wave, we can say that the preceding time operating impulse voltage test findings of long wave is the main foundation that clearance under the effect of extra-high voltage overhead transmission line switching overvoltage is selected in research.For UHV transmission line, air gap distance directly influences the circuit cost, reduce clearance distance, especially phase spacing, not only can improve the transmission capacity (reducing surge impedance of a line) of circuit, and can reduce the line construction cost, the air insulation characteristic is carried out extensive studies under these various waveforms that just require switching overvoltage is produced.
Existing impulse voltage generator can produce operating impulse voltage less than 1000 μ s with conventional method, and can produce the operating impulse voltage of wavefront time greater than 3000 μ s with cascade-connected transformer.There is certain difficulty in the operating impulse voltage that these two kinds of methods produce 2500 μ s.
Summary of the invention
For remedying conventional surge generator and using the cascade-connected transformer deficiency, the object of the invention is to provide a kind of long wave front operation impulse voltage generator, utilize the impulse voltage generator that improves design to produce the preceding time operating impulse voltage of long wave of 1000～2500 μ s, its wavefront time and amplitude can satisfy UHV transmission test needs.It comes into operation, and is significant to air insulation characteristic under the various waveforms of research switching overvoltage generation, not only can improve the transmission capacity (reducing surge impedance of a line) of circuit, and can reduce the line construction cost.
The technical solution adopted for the present invention to solve the technical problems is: long wave front operation impulse voltage generator is characterized in that: charging resistor 1, main capacitance 3, portfire 4, wave rear resistance 9, main capacitance 11, charging resistor 10 are connected as the primary unit of surge generator; Charge switch 2 is connected between the two-stage, links to each other with charging resistor one end of two-stage respectively, and every grade of two ends are connected to a charge switch; Wave front resistance 5 one terminates between the wave rear resistance 9 and main capacitance 11 at the corresponding levels, and the other end is connected between back one-level wave rear resistance 9 and the main capacitance 3; The unit of surge generator has 12 grades at least.
Aforesaid long wave front operation impulse voltage generator is characterized in that: the cell level of surge generator is 25 grades.
Characteristics of the present invention be the charging resistor of every two-stage for mutually in parallel, rather than as the series connection of traditional generator, inter-stage is connected by charging resistor and changes charge switch into and connect.Use improved bilateral charge circuit structure and introduce charge switch, the energy leakage when reducing to discharge produces time operating impulse voltage before the long wave of high efficiency 1000～2500 μ s.
Use improved charge circuit can reduce the influence of charging resistor, improve the speed and the efficient of charging the charging unevenness.Charge switch is closed in the generator charging, and neither influence charging also makes each grade charging voltage the same, and each step voltage difference is almost nil, and charge switch itself does not need very high withstand voltage level, only needs to bear certain through-flow level.When discharge, switch disconnects, and bears two capacitance voltages of one-level, and main capacitance can only reduce loss by wave front resistance and wave rear conductive discharge, has improved discharging efficiency, thereby can produce the preceding time switching impulse of high efficiency long wave.
Produce 2500 μ s wavefront time switching impulse output efficiencies more than 70% according to simulation calculation, extra-high voltage requires more than the long wave front operation blasting operation crest voltage 2200kV, total voltage minimum requirements 3150kV after the tandem of surge generator charging back needs 12 grades at least.
The invention has the beneficial effects as follows that can produce the preceding time operating impulse voltage of long wave of 1000～2500 μ s, its wavefront time and amplitude can satisfy UHV transmission test needs, amplitude reaches more than the 2500kV.
Description of drawings
Fig. 1 is the operation impulse voltage generator circuit theory diagrams of prior art.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
The explanation of label among Fig. 1: X1. charging resistor, X2. main capacitance, X3. wave rear resistance, X4. portfire, X5. impulse high voltage output terminal, X6. testing transformer, X7. silicon stack, X8. charging resistor, X9. charging resistor, X10. wave front resistance, X11. main capacitance.
The explanation of label among Fig. 2: 1. charging resistor, 2. charge switch, 3. main capacitance, 4. portfire, 5. wave front resistance, 6. impulse high voltage output terminal, 7. testing transformer, 8. silicon stack, 9. wave rear resistance, 10. charging resistor, 11. main capacitances.
The present invention is further described below in conjunction with drawings and Examples.
Embodiments of the invention as shown in Figure 2,10 series connection of charging resistor 1, main capacitance 3, portfire 4, wave rear resistance 9, main capacitance 11, charging resistor are as the one-level of surge generator; Charge switch 2 is connected between the two-stage, links to each other with charging resistor one end of two-stage respectively, and every grade of two ends are connected to a charge switch; Wave front resistance 5 one terminates between the wave rear resistance 9 and main capacitance 11 at the corresponding levels, and the other end is connected between back one-level wave rear resistance 9 and the main capacitance 3.Totally 25 grades of surge generators, every step voltage 300kV, two main capacitance maximum charging voltages are respectively ± 150kV, testing transformer 7 and silicon stack 8 are as the power supply of surge generator, adopt full-wave rectifying circuit, be connected on before the first order, two silicon stacks are connected with two charging resistors of the first order respectively.
The unit of surge generator of the present invention has 12 grades at least, and the progression of its cell level is relevant with following factors:
1) the wavefront time of switching impulse is influential to generator efficiency: the generation efficient of times 250 μ s is 70%-80% before the standard switching impulse, produces 2500 μ s wavefront time switching impulse output efficiencies 70%;
2) test product requires: extra-high voltage testing requirements impact output function impact peak value voltage is minimum should be more than 1700kV, and peak value reaches 2500kV could satisfy the test needs fully.
Therefore the unit of surge generator has 12 grades at least.
In the present embodiment, generator has 25 grades of compositions, every grade of maximum charging voltage 300kV, total maximum charging voltage 7500kV.The charge switch conductive material, resistance is very little during conducting, and insulation can tolerate the above voltage of 300kV when cut-offfing, and cut-offs or Closing Switch by the insulating material transferring power between at different levels.
Claims (2)
1, long wave front operation impulse voltage generator is characterized in that: charging resistor (1), main capacitance (3), portfire (4), wave rear resistance (9), main capacitance (11), charging resistor (10) are connected as the primary unit of surge generator; Charge switch (2) is connected between the two-stage, links to each other with charging resistor one end of two-stage respectively, and every grade of two ends are connected to a charge switch; Wave front resistance (5) one terminates between the wave rear resistance (9) and main capacitance (11) at the corresponding levels, and the other end is connected between back one-level wave rear resistance (9) and the main capacitance (3); The unit of surge generator has 12 grades at least.
2, long wave front operation impulse voltage generator as claimed in claim 1 is characterized in that: the cell level of surge generator is 25 grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810047117XA CN101251570A (en) | 2008-03-21 | 2008-03-21 | Long wave front operation impulse voltage generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810047117XA CN101251570A (en) | 2008-03-21 | 2008-03-21 | Long wave front operation impulse voltage generator |
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| CN101251570A true CN101251570A (en) | 2008-08-27 |
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| CNA200810047117XA Pending CN101251570A (en) | 2008-03-21 | 2008-03-21 | Long wave front operation impulse voltage generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243935A (en) * | 2011-05-03 | 2011-11-16 | 湖北工业大学 | Tension spring isolating switch of surge generator charging resistor |
| CN101639507B (en) * | 2009-07-16 | 2012-06-13 | 中国电力科学研究院 | Controllable metal oxide arrester action characteristic testing device and method therefor |
| CN109709425A (en) * | 2018-12-29 | 2019-05-03 | 国网冀北电力有限公司电力科学研究院 | A kind of distribution transformer bears the pilot system and method for short-circuit capacity |
-
2008
- 2008-03-21 CN CNA200810047117XA patent/CN101251570A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639507B (en) * | 2009-07-16 | 2012-06-13 | 中国电力科学研究院 | Controllable metal oxide arrester action characteristic testing device and method therefor |
| CN102243935A (en) * | 2011-05-03 | 2011-11-16 | 湖北工业大学 | Tension spring isolating switch of surge generator charging resistor |
| CN102243935B (en) * | 2011-05-03 | 2014-01-22 | 湖北工业大学 | Tension spring isolating switch of surge generator charging resistor |
| CN109709425A (en) * | 2018-12-29 | 2019-05-03 | 国网冀北电力有限公司电力科学研究院 | A kind of distribution transformer bears the pilot system and method for short-circuit capacity |
| CN109709425B (en) * | 2018-12-29 | 2020-05-22 | 国网冀北电力有限公司电力科学研究院 | System and method for testing short circuit bearing capacity of distribution transformer |
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Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE Free format text: FORMER OWNER: WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID Effective date: 20091120 |
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Effective date of registration: 20091120 Address after: Nanjing City, Jiangsu Province, South ruilu No. 8 post encoding: 210003 Applicant after: State Grid Electric Power Research Insititute Address before: Hubei province Wuhan city Hongshan District Luoyu Road No. 143 post encoding: 430074 Applicant before: Guowang Wuhan High Voltage Inst |
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Open date: 20080827 |