CN107462760A - A kind of high-voltage switch gear transient state earth testing system being used under forceful electric power magnetic environment - Google Patents
A kind of high-voltage switch gear transient state earth testing system being used under forceful electric power magnetic environment Download PDFInfo
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- CN107462760A CN107462760A CN201710470342.3A CN201710470342A CN107462760A CN 107462760 A CN107462760 A CN 107462760A CN 201710470342 A CN201710470342 A CN 201710470342A CN 107462760 A CN107462760 A CN 107462760A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
Abstract
Description
Technical field
The present invention relates to technical field of intelligent equipment, is pressed off more particularly, to a kind of height being used under forceful electric power magnetic environment Close transient state earth testing system.
Background technology
In recent years, deepening continuously with domestic intelligent grid construction process, existing more intelligent substations put into operation, with Conventional substation is compared, and intelligent electronic device (IED, Intelligent are employed on the basis of switchgear Electronic Device), the intelligent assembly such as electronic mutual inductor and its combining unit, switchgear controller, Ke Yi The critical performance parameters of line monitoring switch equipment, the intelligent Process of switchgear is realized, be week life-cycle of high-voltage switch gear Period management and operation maintenance provide technical guarantee.But the mode of site installation causes the adjacent high-voltage switch gear of intelligent assembly Equipment, be more nearly on electromagnetic disturbance source position, so that the electromagnetic compatibility problem of these electronic equipments compare with Toward more protruding, electronic equipment is in the very serious background environment of an electromagnetic pollution.
For the electromagnetic compatibility problem in power system, switchgear operation test operating mode is done to control system It is its main form of expression to disturb, due to presence being closely connected electrically and magnetically, the transient state mistake that intelligent substation primary circuit occurs Journey can enter intelligent assembly by various paths and various transient interferences are produced to it.Severe electromagnetic environment may Two kinds of influences can be caused on intelligent assembly, one is the insulation of destruction intelligent assembly, the chip even resulted on electronic circuit are burnt Ruin, form irreversible permanent damage；The second is the normal work of interference intelligent assembly, makes it the possibility of malfunction be present, And then cause or expand the failure of primary equipment side.Therefore the further investigation intelligent assembly reliability under running environment at the scene It is particularly important.As New Generation of Intelligent transformer station gradually promotes, the operational reliability of intelligent substation increasingly causes pass Note.The standard of traditional transformer station is still continued to use in the electromagnetic compatibility immunity requirement of secondary equipment of intelligent converting station at present, however, From the point of view of the installation site of secondary equipment of intelligent converting station, these requirements may be partially loose, and the intelligent substation that China puts into operation is Repeatedly there are the various electromagnetic interference problems such as transformer data distortion, communication packet loss, it is therefore necessary to intelligent substation two The electromagnetic compatibility immunity of secondary device requires to carry out corresponding analysis and research, to intelligent equipment progress reliability assessment, in intelligence The hidden danger of electromagnetic interference is eliminated in the design and operation of energy power network.At present due to the detection method and prevention hand of no ground potential Section, often causes in test the damage of intelligent assembly.
Therefore, it is necessary to a kind of technology, to solve to be used for asking for high-voltage switch gear transient state earth testing under forceful electric power magnetic environment Topic.
The content of the invention
The present invention provides a kind of high-voltage switch gear transient state earth testing system being used under forceful electric power magnetic environment, to solve such as What is under forceful electric power magnetic environment the problem of high-voltage switch gear transient state earth testing.
In order to solve the above problems, the invention provides a kind of survey of the high-voltage switch gear transient state ground potential under forceful electric power magnetic environment Test system, the system include：High-tension switch gear, high-voltage probe, attenuator, build-out resistor R4, oscillograph, ups power, First coaxial cable, the second coaxial cable, triaxial cable, the first earth point O1, the second earth point O2, the 3rd earth point O3；
The high-voltage probe includes the 0th noninductive resistance R0, the input of the high-voltage probe is connected to the height and presses off Close the surface of shell of equipment；The input phase that the output end of the high-voltage probe passes through the first coaxial cable and the attenuator Connection；The high-voltage probe is used for the ground potential voltage signal for obtaining the surface of shell of the high-tension switch gear；
It is the first noninductive resistance R inside the attenuator1, the second noninductive resistance R2, the 3rd noninductive resistance R3, described first Noninductive resistance R1, the second noninductive resistance R2, the 3rd noninductive resistance R3Shielding is realized by the metal shell of attenuator； The voltage signal that the attenuator is used to input the input of the attenuator carries out first time partial pressure；The attenuator The build-out resistor R that output end is inputted at the oscillograph port by the second coaxial cable4；The build-out resistor R4For By the build-out resistor R4Input voltage signal carry out second of partial pressure；The build-out resistor R4Output end and institute Oscillograph is stated to be connected；The oscillograph is used to monitor the ground potential voltage waveform for being input to the oscillograph；
The high-tension switch gear and the first earth point O1It is connected；
The output end housing of the high-voltage probe passes through the triaxial cable and the second earth point O2It is connected；It is described The shell of high-voltage probe is connected with the screen layer of first coaxial cable；
The second earth point O2Away from the first earth point O1, the second earth point O2With the first earth point O1Extremely 15 meters are spaced less.
Preferably, the 0th noninductive resistance R0Resistance be 5k Ω, power 25W, maximum measurement transient voltage is 50kV。
Preferably, the wave impedance of first coaxial cable, second coaxial cable and the triaxial cable is 50Ω；
In order to prevent wave reflection of the high frequency transient voltages in coaxial cable communication process, dynamic response is improved, design is same The wave impedance of shaft cable is identical with load impedance, is all 50 Ω；
In terms of from the first coaxial cable to attenuator, impedance is 50 Ω, i.e. R1//(R2+R4//R3The Ω of)=50；
Second coaxial cable sees that impedance is 50 Ω, i.e. (R to attenuator0//R1+R2)//R3=50 Ω；
Second coaxial cable sees that impedance is 50 Ω, i.e. R to oscillograph4=50 Ω.
Preferably, the screen layer of the triaxial cable and the signal wire of the triaxial cable are in the high pressure Opened a way at the shell of probe；The signal wire of the screen layer and the triaxial cable of the triaxial cable connects second Place O2Short circuit.
Preferably, it is closely to lay between first coaxial cable and second coaxial cable, with no more than 2 meters Interval fix first coaxial cable and second coaxial cable with insulating materials.
Preferably, the first time partial pressure no-load voltage ratio k1For 100, second of partial pressure no-load voltage ratio k2For 10, the system is total Partial pressure no-load voltage ratio k is 1000, k=k1×k2。
Preferably, the first time partial pressure no-load voltage ratio k1=[R0+R1//(R2+R4//R3)]：[R1// (R2+R4//R3)]= 100:1, wherein R0For the 0th noninductive resistance R0Resistance, R1For the first noninductive resistance R1Resistance, R2For the second noninductive resistance R2 Resistance, R3For the 3rd noninductive resistance R3Resistance, R4For build-out resistor R4Resistance.
Preferably, second of partial pressure no-load voltage ratio k2=(R2+R4//R3):R4//R3=10:1, wherein R2It is noninductive for second Resistance R2Resistance, R3For the 3rd noninductive resistance R3Resistance, R4For build-out resistor R4Resistance.
Preferably, including UPS independent current sources, it is powered for the oscillograph.
Preferably, including generating means is tested, it is described to test generating means and the 3rd earth point O3It is connected.
Technical solution of the present invention provides one kind and is used for high-voltage switch gear transient state earth testing system under forceful electric power magnetic environment, fills Point using the transient state ground potential duration it is short the characteristics of, using small valued resistor as the high-voltage arm of divider can reduce due to Time delay caused by low-voltage arm distribution capacity, the dynamic responding speed of test signal is improved, while noninductive resistance further carries High dynamic response.Technical scheme prevents high-frequency signal from reflecting using impedance match technique.The technical side of the present invention Case is connected the interference of signal wire using single-point grounding technology solution spatial electromagnetic interference signal with distal reference to measurement point.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is to be used for high-voltage switch gear transient state earth testing under forceful electric power magnetic environment according to one kind of embodiment of the present invention System construction drawing；And
Fig. 2 is to be used for high-voltage switch gear transient state earth testing under forceful electric power magnetic environment according to one kind of embodiment of the present invention Systematic schematic diagram.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical Reference.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field Have and common understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that with The linguistic context of its association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is to be used for high-voltage switch gear transient state earth testing under forceful electric power magnetic environment according to one kind of embodiment of the present invention System construction drawing.Embodiment of the present invention proposes a kind of for high-voltage switch gear transient state earth testing system under forceful electric power magnetic environment System, for testing the level of the high-tension switch gear housing transient state ground potential under forceful electric power magnetic environment, high-voltage switch gear can be achieved in thunder and lightning Impulse withstand voltage, short circuit current such as cut-off at the accurate measurement of ground potential transient voltage in experiment, are the intelligent assembly magnetic environment of resistance to forceful electric power Design foundation is provided, to improve the overall reliability of Intellectualized Switchgear.As shown in figure 1, system 100 includes：Height presses off Close equipment 101, high-voltage probe 102, attenuator 103, build-out resistor R4, oscillograph 104, the first coaxial cable, the second coaxial electrical Cable, triaxial cable.
High-voltage probe 102 includes the 0th noninductive resistance R0, the input of high-voltage probe 102 is connected to high-tension switch gear Surface of shell；The output end of high-voltage probe 102 is connected by the first coaxial cable with the input of attenuator 103；High pressure Probe 102 is used for the voltage signal for obtaining the ground potential of the surface of shell of high-tension switch gear.
The inside of attenuator 103 is the first noninductive resistance R1, the second noninductive resistance R2, the 3rd noninductive resistance R3, first is noninductive Resistance R1, the second noninductive resistance R2, the 3rd noninductive resistance R3Shielding is realized by the metal shell of attenuator 103；Attenuator 103 For the voltage signal of the input input of attenuator 103 to be carried out into first time partial pressure；The output end of attenuator 103 passes through Build-out resistor R at two coaxial cables input oscillograph 104 port4；Build-out resistor R4For by build-out resistor R4Input Voltage signal carry out second of partial pressure；Build-out resistor R4Output end be connected with oscillograph 104；Oscillograph 104 is used to supervise Survey the ground potential voltage waveform for being input to oscillograph 104.
High-tension switch gear and the first earth point O1It is connected, to reduce the interference of above earth potential signal.
The output end housing of high-voltage probe 102 passes through triaxial cable and the second earth point O2It is connected；High-voltage probe 102 shell is connected with the screen layer of the first coaxial cable；The shell of high-voltage probe 102, the first coaxial cable, attenuator 103rd, the second coaxial cable and the earth point O of oscillograph 104 and second2It is connected.
The second earth point O2Away from the first earth point O1, the second earth point O2With the first earth point O1At least it is spaced 15 Rice.
First earth point O of embodiment of the present invention1, the second earth point O2And the 3rd earth point O3It is grounded to be flat Copper cash.Second earth point O2Should be away from high-tension switch gear major loop experiment generating means the 3rd earth point O3Set with high-voltage switch gear First earth point O of standby 101 shells1, to reduce the interference of above earth potential signal.
Preferably, the 0th noninductive resistance R0Resistance be 5k Ω, power 25W, maximum measurement transient voltage is 50kV.
Preferably, the wave impedance of the first coaxial cable, the second coaxial cable and triaxial cable is 50 Ω.First is same The wave impedance of shaft cable, the second coaxial cable and triaxial cable matches with low-voltage arm resistance value, prevents wave reflection from causing letter Number distortion.
In order to prevent wave reflection of the high frequency transient voltages in coaxial cable communication process, dynamic response is improved, design is same The wave impedance of shaft cable is identical with load impedance, is all 50 Ω.
In terms of from the first coaxial cable to attenuator, impedance is 50 Ω, i.e. R1//(R2+R4//R3The Ω of)=50；
Second coaxial cable sees that impedance is 50 Ω, i.e. (R to attenuator0//R1+R2)//R3=50 Ω；
Second coaxial cable sees that impedance is 50 Ω, i.e. R to oscillograph4=50 Ω.
Preferably, the shell of the screen layer of triaxial cable and the signal wire of triaxial cable in high-voltage probe 102 Place's open circuit；The screen layer of triaxial cable and the signal wire of triaxial cable are in the second earth point O2Short circuit.
Preferably, it is closely to lay between the first coaxial cable and the second coaxial cable, is used with the interval no more than 2 meters Insulating materials fixes the first coaxial cable and the second coaxial cable.Embodiments of the present invention the first coaxial cable L1 and the 3rd It is closely to lay between coaxial cable L3, is fastened every about 2 meters with insulating tape, reduces test signal conducting path shape Into area, reduce exterior space and radiate influence to test signal.
Preferably, first time partial pressure no-load voltage ratio k1For 100, second of partial pressure no-load voltage ratio k2For 10, system total score buckling is than k 1000, k=k1×k2。
Preferably, first time partial pressure no-load voltage ratio k1=[R0+R1//(R2+R4//R3)]：[R1//(R2+ R4//R3)]=100:1, Wherein R0For the 0th noninductive resistance R0Resistance, R1For the first noninductive resistance R1Resistance, R2For the second noninductive resistance R2Resistance Value, R3For the 3rd noninductive resistance R3Resistance, R4For build-out resistor R4Resistance.
Preferably, second of partial pressure no-load voltage ratio k2=(R2+R4//R3):R4//R3=10:1, wherein R2For the second noninductive resistance R2Resistance, R3For the 3rd noninductive resistance R3Resistance, R4For build-out resistor R4Resistance.
Preferably, including UPS independent current sources, it is powered for oscillograph 104.Embodiments of the present invention oscillograph leads to The power supply of UPS independent current sources is crossed, it is completely isolated with experiment power supply, avoid power supply disturbance test system.
Preferably, including generating means is tested, tests generating means and the 3rd earth point O3It is connected.
Embodiments of the present invention, based on the characteristics of transient voltage duration is short, peak value is high, carried out in high-voltage switch gear During the experiments such as lightning impulse is pressure-resistant, short circuit current cut-offs, using the fast noninductive small valued resistor of dynamic response as partial pressure The high-voltage probe of device, is connected to the shell of high-tension switch gear 101, and the shell of high-tension switch gear 101 includes SF6 gas sensors Mount point, electronic mutual inductor housing, Intelligent component cabinet shell etc., high-voltage probe 102 passes through the first coaxial cable and attenuator 103 connections, the output end of attenuator 103 pass through the second coaxial cable and build-out resistor R4Connection, embodiment of the present invention are adopted Prevent high-frequency signal from reflecting with impedance match technique, and be ultimately attached to oscillograph 104, oscillograph 104 passes through UPS independent electricals Source 105 powers.Embodiment of the present invention solves spatial electromagnetic interference signal to high-tension switch gear using single-point grounding technology 101 measurement point is connected the interference of signal wire with distal reference, and the support earth point of high-pressure switchgear 101 is first Earth point O1, experiment generating means earth point is the 3rd earth point O3, ground potential signal is along high-voltage switch gear shell, high-voltage probe 102 internal resistance R0For 5k Ω resistance, the first coaxial coaxial cable L1 inner cores, attenuator 103, the second coaxial cable L2 Inner core, oscillograph 104, the second coaxial cable L2 outer layers, the shell of attenuator 103, the output end housing of high-voltage probe 102 and Two earth point O2Connection.Transmission function with reference to electronic mutual inductor etc., it can further analyze SF6 gas sensors, electronic type The electromagnetic interference influence that transformer collecting unit and intelligent assembly are subject to, so as to propose to intelligent assembly reliability have compared with The typical switch test operating mode influenceed greatly, the intelligent high-voltage switchgear performance detection scheme more rigorous according to this formulation, is carried Rise the networking reliability of intelligent high-voltage switchgear.
Used for high-voltage switch in the present invention is Cubicle Gas-Insulated Switchgear (referred to as " GIS ").
Fig. 2 is to be used for high-voltage switch gear transient state earth testing under forceful electric power magnetic environment according to one kind of embodiment of the present invention Systematic schematic diagram.As shown in Fig. 2 high-voltage probe 201 is connected by the first coaxial cable L1 with attenuator 202, attenuator 202 Output end pass through the second coaxial cable L2 and build-out resistor R4Connection, embodiment of the present invention are prevented using impedance match technique Only high-frequency signal is reflected, and is ultimately attached to oscillograph 203, and oscillograph 203 is powered by UPS independent current sources.High-voltage probe 201 include the 0th noninductive resistance R0, the input of high-voltage probe 201 is connected to high-tension switch gear body；High-voltage probe 201 Output end be connected by the first coaxial cable L1 with the input of attenuator 202；High-voltage probe 201 is used to obtain high pressure The intrinsic voltage signal of switchgear.The inside of attenuator 202 is the first noninductive resistance R1, the second noninductive resistance R2, the 3rd nothing Sensing resistor R3, the first noninductive resistance R1, the second noninductive resistance R2, the 3rd noninductive resistance R3Pass through the metal shell of attenuator 202 Realize shielding.The voltage signal that attenuator 202 is used to input the input of attenuator 202 carries out first time partial pressure；Decay The build-out resistor R that the output end of device 202 is inputted at the port of oscillograph 204 by the second coaxial cable L24；Build-out resistor R4For By build-out resistor R4Input voltage signal carry out second of partial pressure；Build-out resistor R4Output end and the phase of oscillograph 203 Connection；Oscillograph 203 is used to monitor the voltage signal for being input to oscillograph 203.
Preferably, first time partial pressure no-load voltage ratio k1For 100, second of partial pressure no-load voltage ratio k2For 10, system total score buckling is than k 1000, k=k1×k2。
Preferably, first time partial pressure no-load voltage ratio k1=[R0+R1//(R2+R4//R3)]：[R1//(R2+ R4//R3)]=100:1, Wherein R0For the 0th noninductive resistance R0Resistance, R1For the first noninductive resistance R1Resistance, R2For the second noninductive resistance R2Resistance Value, R3For the 3rd noninductive resistance R3Resistance, R4For build-out resistor R4Resistance.
Preferably, second of partial pressure no-load voltage ratio k2=(R2+R4//R3):R4//R3=10:1, wherein R2For the second noninductive resistance R2Resistance, R3For the 3rd noninductive resistance R3Resistance, R4For build-out resistor R4Resistance.
The output end housing of high-voltage probe 201 passes through triaxial cable L3 and the second earth point O2It is connected；High pressure is visited First 201 shell is connected with the first coaxial cable L1 screen layer；The shell of high-voltage probe 201, the first coaxial cable L1, decline Subtract device 202, the second coaxial cable L2 and the earth point O of oscillograph 203 and second2It is connected.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, just As subsidiary Patent right requirement is limited, except the present invention other embodiments disclosed above equally fall in this hair In bright scope.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field Release, unless clearly being defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened Ground is construed at least one example in described device, component etc., unless otherwise expressly specified.Any side disclosed herein The step of method, need not all be run with disclosed accurately order, unless explicitly stated otherwise.
Claims (10)
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