CN103543305B - Weak damping alternating-current high-voltage generator for partial discharge detection of power equipment - Google Patents
Weak damping alternating-current high-voltage generator for partial discharge detection of power equipment Download PDFInfo
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Abstract
The invention discloses a weak damping alternating current high voltage generator for detecting partial discharge of power equipment, which comprises: the high-power direct-current power supply is connected with the alternating-current power supply, the high-voltage semiconductor switch is connected with the direct-current power supply, the reactor unit is connected with the high-voltage semiconductor switch, the resistance-capacitance voltage divider is connected with the reactor in parallel, and the capacitance unit is connected with the resistance-capacitance voltage divider in parallel. The device can directly replace the reactor unit with inductive equipment such as a transformer, a reactor and the like; or the capacitance of a large-capacity test article such as a power cable replaces a capacitance unit, and partial discharge measurement can be carried out on various power equipment by adjusting inductance and capacitance elements in a main LC resonance circuit in the device. The whole set of device has the advantages of light weight, reliable work, high safety and the like, and belongs to a nondestructive partial discharge weak damping alternating current high-voltage testing device. The generator can be used for carrying out partial discharge test on various capacitive and inductive devices, and is suitable for field test of various power devices such as transformers, reactors, capacitors, cables and the like.
Description
Technical field
The present invention relates to Electric Power Equipment Insulation state inspection and application thereof, particularly relate to a kind of high pressure underdamping alternating-voltage generator for power equipment Partial Discharge Detection.
Background technology
Partial Discharge Detection and assignment test belong to the on-the-spot commissioning test of power cable and the important content of repair based on condition of component work.For the power equipment with high capacitance, the volume and weight of the frequency high voltage power supply needed for its site test is usually all very large, and transport difficult, is difficult to meet on-the-spot test demand.In the last few years, the dfamped alternating current voltage tester technology of a kind of advanced person obtained at electric power enterprise and applied more and more widely.This type of portable devices type is strong, easy to operate, has good equivalence, be applicable to the site test of all kinds of high capacitance power equipment with power frequency ac voltage.
But, also there is some technical matterss and wait to solve in current dfamped alternating current voltage tester technology: 1) the critical component high-voltage semi-conductor switch of dfamped alternating current voltage generator is among LC series resonant tank, and the through-current capability of semiconductor switch constrains the further genralrlization application of wave of oscillation measuring technology in actual applications.The performance of Simultaneous Switching and accessory circuit thereof also can have an impact to waveform and test effect; 2) traditional dfamped alternating current voltage testing system needs when testing to use high-voltage DC power supply to major loop electric capacity and Devices to test charging, this makes Devices to test standing damped oscillation wavefront and first must bear the high direct voltage of long period, have impact on the equivalence of damped oscillation wave voltage and power frequency ac voltage shelf depreciation test result.3) traditional topological structure requires that dfamped alternating current voltage testing system must have high-voltage DC power supply, and the two ends of air reactor all need higher insulating Design, these factors also increase the volume and weight of existing testing apparatus, reduce the portability of equipment.4) traditional dfamped alternating current voltage testing system is only applicable to the power equipment with high capacitance, cannot carry out shelf depreciation test job for low-voltage capacity or induction equipment.Therefore, how safe, portable, the efficient novel underdamping ac high voltage generator of designing and making one, solve at present based on the realistic problem that the power equipment partial discharge monitoring system of dfamped alternating current Voltage Technique faces, one of important subject of real genus current industry.
Summary of the invention
Technical matters to be solved by this invention is, a kind of underdamping ac high voltage generator with novel topological structure is provided, and there is the features such as security is high, portability strong, be widely used, to overcome the monitoring system deficiency that technical elements exists in the application practice of electric power enterprise and the difficulty of prior art.
For solving the problems of the technologies described above, the embodiment of the present invention provides a kind of power equipment Partial Discharge Detection underdamping ac high voltage generator, and this high pressure generator mainly comprises following unit:
High-power DC power supply S11, is connected with power frequency AC, powers for giving whole generator;
High-voltage semi-conductor K switch 11, is connected with direct supply, for controlling the charge circuit of generator;
Reactor unit L11, its one end is connected with high-voltage semi-conductor K switch 11, other end ground connection, is energy storage and the oscillating unit of whole generator;
RC divider V11, in parallel with reactor unit L11, for measuring the high pressure damped oscillation waveform at Devices to test two ends and corresponding local discharge signal;
Capacitor cell C11, in parallel with RC divider V11, participate in major loop and vibrate and regulate oscillation frequency.
Preferably, described high-power DC power supply comprises further:
Big current rectifier bridge B21, two input end is connected with alternating current 220V, one end ground connection of output terminal;
First electric capacity C21, its two ends are in parallel with two output terminals of rectifier bridge respectively;
High speed electronic switch K21, its one end is connected with the first electric capacity C21, and the other end is connected with the second electric capacity C22;
Second electric capacity C22, its one end is connected with described electronic switch K21's, other end ground connection;
Inductance L 21, its one end is connected with described second electric capacity C22, and the other end is connected with the 3rd electric capacity C23;
3rd electric capacity C23, its one end is the output terminal of direct supply, is connected with described inductance L 21, other end ground connection.
Preferably, when scene is without power frequency AC, the high-power DC power supply S11 in generator can be replaced by jumbo rechargeable battery.
Preferably, described reactor unit L11 is in parallel with Devices to test, and has the low internal resistance value of the slow-decay ensureing dfamped alternating current voltage waveform.
Preferably, described reactor unit L11 winding is wound on epoxy skeleton by enamel covered wire segmentation, and it is fixing to use insulation barrier to isolate between adjacent two sections of windings, has good withstand voltage properties.
Preferably, described high-voltage semi-conductor K switch 11 is formed by the block coupled in series of multiple low-voltage-grade, and each unit module is connected and composed successively by high voltage isolating transformer, IGBT drive plate, IGBT module and corresponding buffer protection circuit respectively.
Preferably, the input end of described high-voltage semi-conductor K switch 11 exchanges with 220V and is connected, and the drive plate of IGBT is by optical fiber transfer control signal.
Preferably, described high-voltage semi-conductor K switch 11 only works in charge circuit, does not participate in the vibration of major loop.
The present invention is compared with device in the past, high-voltage semi-conductor switch does not participate in the oscillatory process of major loop, and charge circuit is without the need to high-voltage DC power supply, the initial time of the dfamped alternating current HT waveform produced is close to earth potential, whole system is had, and device is light, reliable operation, security advantages of higher, belongs to harmless shelf depreciation underdamping ac high-voltage proving installation.Simultaneously by the inductance in adjusting gear main oscillations loop and capacitor cell, this generator can carry out shelf depreciation test to various capacitive and induction equipment, is applicable to the on-the-spot test of the multiple power equipments such as transformer, reactor, capacitor and cable.
Implement embodiments of the invention, there is following beneficial effect:
1, the underdamping ac high voltage generator in the present invention adopts novel main circuit topological structure, whole device reliable operation, easy to operate, and portability is strong, is applicable to the Partial Discharge Testing on Site of all kinds of power equipment;
2, high-voltage semi-conductor switch of the present invention is only in current supply circuit, does not participate in the oscillatory process of high pressure dfamped alternating current voltage major loop, is conducive to the serviceable life extending switch, also improves system testing capacity simultaneously and improves test effect;
3, the air reactor in this test macro is in parallel with Devices to test, the direct ground connection in one end, does not need two ends all to carry out meeting the High-Voltage Insulation design of system requirements, greatly simplifies design and the using method of reactor;
4, the underdamping ac high voltage generator of the embodiment of the present invention is when carrying out on-the-spot partial discharge monitoring, under having a lot of situation, scene does not have AC power to use, the lithium battery direct supply that now only need access 30V/10A can carry out test job, and use-pattern is flexible;
5, the underdamping ac high voltage generator of the embodiment of the present invention is when carrying out on-the-spot partial discharge monitoring, and operating personnel only need control charge circuit in low-pressure side can produce required dfamped alternating current high pressure.Compared with existing proving installation: in the energy storage charging stage of major loop, be applied to the DC voltage at Devices to test two ends close to earth potential, can better equivalent power frequency ac voltage, especially some are not suitable for carrying out the test product of HVDC TEST (such as, twisted polyethylene cable), there is obvious advantage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the main circuit structure schematic diagram of an embodiment of a kind of power equipment Partial Discharge Detection of the present invention underdamping ac high voltage generator.
Fig. 2 is the electrical block diagram of high-power DC power supply in an embodiment of a kind of power equipment Partial Discharge Detection of the present invention underdamping ac high voltage generator.
Fig. 3 is an embodiment hollow core reactor winding construction schematic diagram of a kind of power equipment Partial Discharge Detection of the present invention underdamping ac high voltage generator.
Fig. 4 is an embodiment mesohigh semiconductor switch composition block diagram of a kind of power equipment Partial Discharge Detection of the present invention underdamping ac high voltage generator.
Fig. 5 is the high-voltage signal oscillogram at Devices to test two ends in an embodiment of a kind of power equipment Partial Discharge Detection of the present invention underdamping ac high voltage generator.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, be described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, be an embodiment of a kind of power equipment Partial Discharge Detection of the present invention underdamping ac high voltage generator.This generator mainly comprises: high-power DC power supply S11, high-voltage semi-conductor K switch 11, reactor unit L11, RC divider V11 and capacitor cell C11.
Wherein, high-power DC power supply S11 is connected with power frequency AC, and for powering to whole system, its highest output DC voltage is less than 500V in one embodiment, and output current is less than 50A.
High-voltage semi-conductor K switch 11, its two ends are connected with the non-ground-end of air reactor with DC source respectively, for controlling the charge circuit of whole device, protect the low-pressure side elements such as direct supply when major loop produces dfamped alternating current high pressure simultaneously.In one embodiment, switching speed is less than 1 μ s, is withstand voltagely greater than 25kV, and rated current is greater than the semiconductor switch module of 80A.
Reactor unit L11 adopts air reactor, and its one end is connected with high-voltage semi-conductor K switch 11, other end ground connection, is energy storage and the oscillating unit of whole device.Namely when high-voltage semi-conductor K switch 11 closes, flow through certain DC current in reactor, size of current is determined by the internal resistance of charging voltage, the internal resistance of source and reactor; After high-voltage semi-conductor K switch 11 disconnects, reactor, by the capacitor resonance in parallel with it, produces dfamped alternating current high pressure.Air reactor can select internal resistance to be 2 Ω in one embodiment, and inductance value is 600mH, and instantaneous through-current capability is greater than the fine rule air reactor of 50A.
RC divider V11, in parallel with air reactor L11, for measuring the dfamped alternating current voltage waveform at Devices to test two ends.In one embodiment, can select withstand voltage 50kV, intrinsic standoff ratio is the high-pressure resistance-capacitance voltage divider of 1:10000, and total series capacitance of electric capacity arm is less than 1nF, and total resistance in series of resistive arm is 50M Ω.
Capacitor cell C11 selects low-loss high pressure bulky capacitor, in parallel with RC divider V11, its one end is the output terminal of device, participates in oscillation circuit and also regulates oscillation frequency, and choosing of C11 determined by the frequency of the equivalent electric of power equipment to be measured perhaps inductance and test voltage.In one embodiment, C11 can select 1uF, the noninductive polypropylene screen of low-loss (CBB) electric capacity of withstand voltage 30kV.
Its specific works process is: first closed high semiconductor switch K11, increase the output voltage of high-power DC power supply S11 gradually, when the electric current in reactor unit L11 reaches preset value, disconnect high-voltage semi-conductor K switch 11, then reactor unit L11 and capacitor cell C11 will form LC resonant tank.When reactor unit L11 and the internal resistance of LC resonant tank less time, Devices to test or RC divider V11 two ends will produce underdamping ac high-voltage.By the inductance in LC resonant tank main in regulating device and capacity cell, this generator can carry out measurement of partial discharge to multiple power equipment.Specifically, for the induction equipment such as transformer and reactor, Devices to test directly can be replaced the reactor unit L11 in generator, then according to oscillation frequency requirement, select suitable capacitor cell C11; When Devices to test is the Large Copacity test products such as power cable, the electric capacity of available test product self replaces the capacitor cell C11 in generator, reactor unit then selects the air reactor of low internal resistance value, and when the electric capacity of test product is less, then can also engages suitable building-out capacitor and regulate oscillation frequency.
As shown in Figure 2, be the electrical block diagram of high-power DC power supply in one embodiment of the invention.Preferably, high-power DC power supply comprises further: big current rectifier bridge B21, and its input end is connected with alternating current 220V, one end ground connection of output terminal; First electric capacity C21, its two ends are in parallel with two output terminals of rectifier bridge respectively; High speed electronic switch K21, its one end is connected with the first electric capacity C21's, and the other end is connected with the second electric capacity C22's; Second electric capacity C22, its one end is connected with described electronic switch K21's, other end ground connection; Inductance L 21, its one end is connected with described second electric capacity C22, and the other end is connected with the 3rd electric capacity C23; 3rd electric capacity C23, its one end is the output terminal of direct supply, is connected with described inductance L 21, other end ground connection.
In one embodiment, the parameter value of above-mentioned each element is chosen as: B21 is withstand voltagely not less than 500V(AC), the through-flow high-voltage rectifier bridge being not less than 50A; Electric capacity C21=C22=C23=100uF, and be withstand voltagely greater than 500V; Inductance L 21=100uH, is through-flowly not less than 50A; High speed electronic switch K21 wherein adopts MOSFET power electronic devices, is withstand voltagely not less than 500V, and electric current is not less than 100A, and its control signal is provided by corresponding pulse-length modulation (PWM) circuit.
When test site is without power frequency AC, the high-power DC power supply S11 in generator is replaced by jumbo rechargeable battery.
As shown in Figure 3, be one embodiment of the invention hollow core reactor winding construction schematic diagram.In figure, 1 is reactor winding, and 2 is graded insulation baffle plate.Preferably, described air reactor adopts on enamel covered wire segmentation coiling and epoxy skeleton, uses insulation barrier to isolate fixing between adjacent two sections of windings, and this kind of winding construction can make reactor have less volume under the prerequisite ensureing electric property.
In one embodiment, the winding of reactor adopts the enamel covered wire of diameter 2mm, and divide 4 sections and carry out coiling, winding overall height is 30cm, and total number of turns is 1500 circles.Thickness is adopted to be that the polyfluortetraethylene plate of 10mm is isolated between each sectional wind.
Reactor is withstand voltage, and the 30kV(of reaching partial discharge quantity is less than 10pC).
Reactor unit L11 is in parallel with Devices to test, and has the low internal resistance value of the slow-decay ensureing dfamped alternating current voltage waveform.
As shown in Figure 4, be one embodiment of the invention mesohigh semiconductor switch composition block diagram.Preferably, described high-voltage semi-conductor K switch 11 only works in charge circuit, does not participate in the vibration of major loop.Its concrete structure is formed by the block coupled in series of multiple low-voltage-grade, and each module is connected and composed successively by high voltage isolating transformer, IGBT drive plate, IGBT module and corresponding buffer protection circuit respectively.The input end of high voltage isolating transformer exchanges with 220V and is connected, and the drive plate of IGBT is by optical fiber transfer control signal.
In one embodiment, 10 low-grade switch modules can be used to connect, the withstand voltage 3.3kV of IGBT that each unit module is selected, electric current is not less than the module of 100A; High voltage isolating transformer selects isolation voltage 30kV, power 20w; For ensureing the consistance of switch, the optical fiber transfer control signal of equal length (2m) is selected on each road; Buffer protection circuit can select RCD type circuit to protect, and design parameter is: R=10 Ω, C=1nF(are withstand voltage is not less than 4kV), D selects the fast recovery schottky diode series connection of 3 1.2kV.
As shown in Figure 5, be the output waveform of underdamping ac high-voltage of (specifically see Fig. 1 introduction) in one embodiment of the invention.As can be seen from this figure, after the parameter by embodiment described in Fig. 1 is chosen, generator of the present invention can produce the high pressure damp oscillatory wave that amplitude reaches 20kV, and this waveform initial time initial value is close to earth potential, oscillation period is ms level, can equivalent industrial frequency AC high pressure.
Above disclosed is only preferred embodiment of the present invention; so can not limit interest field of the present invention with this; those skilled in the art utilize the technology contents of above-mentioned exposure to make a little simple modification, equivalent variations or modification, still belong within protection scope of the present invention.
Claims (7)
1. a power equipment Partial Discharge Detection underdamping ac high voltage generator, is characterized in that, this high pressure generator mainly comprises following unit:
High-power DC power supply S11, is connected with power frequency AC, powers for giving whole generator;
High-voltage semi-conductor K switch 11, is connected with direct supply, for controlling the charge circuit of generator;
Reactor unit L11, its one end is connected with high-voltage semi-conductor K switch 11, other end ground connection, is energy storage and the oscillating unit of whole generator;
RC divider V11, in parallel with reactor unit L11, for measuring the high pressure damped oscillation waveform at Devices to test two ends and corresponding local discharge signal;
Capacitor cell C11, in parallel with RC divider V11, participate in major loop and vibrate and regulate oscillation frequency;
Described high-power DC power supply S11 comprises further:
Big current rectifier bridge B21, two input end is connected with alternating current 220V, one end ground connection of output terminal;
First electric capacity C21, its two ends are in parallel with two output terminals of big current rectifier bridge B21 respectively;
High speed electronic switch K21, its one end is connected with the first electric capacity C21, and the other end is connected with the second electric capacity C22;
Second electric capacity C22, its one end is connected with described electronic switch K21's, other end ground connection;
Inductance L 21, its one end is connected with described second electric capacity C22, and the other end is connected with the 3rd electric capacity C23;
3rd electric capacity C23, its one end is the output terminal of direct supply, is connected with described inductance L 21, other end ground connection.
2. a kind of power equipment Partial Discharge Detection underdamping ac high voltage generator as claimed in claim 1, it is characterized in that, when test site is without power frequency AC, the high-power DC power supply S11 in generator is replaced by jumbo rechargeable battery.
3. a kind of power equipment Partial Discharge Detection underdamping ac high voltage generator according to claim 1, it is characterized in that, described reactor unit L11 is in parallel with Devices to test, and has the low internal resistance value of the slow-decay ensureing dfamped alternating current voltage waveform.
4. a kind of power equipment Partial Discharge Detection underdamping ac high voltage generator according to claim 3, it is characterized in that, described reactor unit L11 section of winding is wound on epoxy skeleton, and fixing with insulation barrier isolation between adjacent two sections of windings.
5. a kind of power equipment Partial Discharge Detection underdamping ac high voltage generator according to claim 1; it is characterized in that; described high-voltage semi-conductor K switch 11 is formed by the block coupled in series of multiple low-voltage-grade, and each unit module is connected and composed successively by high voltage isolating transformer, IGBT drive plate, IGBT module and corresponding buffer protection circuit respectively.
6. a kind of power equipment Partial Discharge Detection underdamping ac high voltage generator according to claim 5, is characterized in that, the input end of described high-voltage semi-conductor K switch 11 exchanges with 220V and is connected, and the drive plate of IGBT is by optical fiber transfer control signal.
7. a kind of power equipment Partial Discharge Detection underdamping ac high voltage generator according to claim 5, it is characterized in that, described high-voltage semi-conductor K switch 11 only works in charge circuit, does not participate in the oscillatory process of major loop.
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| CN104965160B (en) * | 2015-05-29 | 2018-01-23 | 广西电网有限责任公司电力科学研究院 | A kind of cable local discharge detection method and detection means |
| CN106018894B (en) * | 2016-05-03 | 2019-01-11 | 苏州泰思特电子科技有限公司 | EMC test attenuation oscillasion impulse voltage generator |
| CN108964468B (en) * | 2016-05-03 | 2020-07-17 | 苏州泰思特电子科技有限公司 | High voltage generator for multiple voltage classes |
| CN109581161B (en) * | 2018-12-18 | 2021-01-19 | 西安交通大学 | Portable partial discharge detection system of 10kV transformer based on oscillatory wave |
| CN111693919A (en) * | 2020-06-17 | 2020-09-22 | 南方电网科学研究院有限责任公司 | Test circuit and device of thyristor voltage monitoring board |
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| CN202693739U (en) * | 2012-06-19 | 2013-01-23 | 扬州市双宝电力设备有限公司 | Series resonance voltage withstand test device |
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| US3781667A (en) * | 1972-03-17 | 1973-12-25 | Gen Electric | High voltage resonant testing circuit |
| CN101349734A (en) * | 2008-09-02 | 2009-01-21 | 薛建仁 | Apparatus for generating oscillating wave for electrical apparatus test |
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