CN102121948A - System for measuring transient shell voltage of gas insulated switchgear - Google Patents
System for measuring transient shell voltage of gas insulated switchgear Download PDFInfo
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- CN102121948A CN102121948A CN2010105774208A CN201010577420A CN102121948A CN 102121948 A CN102121948 A CN 102121948A CN 2010105774208 A CN2010105774208 A CN 2010105774208A CN 201010577420 A CN201010577420 A CN 201010577420A CN 102121948 A CN102121948 A CN 102121948A
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Abstract
In order to reduce disadvantageous influence caused by electromagnetic interference, improve the accuracy of measurement and provide a shielding device for measuring the transient shell voltage of a gas insulated switchgear (GIS) when the GIS is measured, the invention provides a system for measuring the transient shell voltage of the GIS. The system is characterized by comprising a measuring cable, a voltage measuring device and a measured data processing system, wherein the measuring cable is connected between a shell of the GIS and the voltage measuring device; the voltage measuring device is used for measuring the voltage of the shell of the GIS; the measured data processing system is used for processing the measured data from the voltage measuring device; and the measuring system comprises the shielding device which is used for wholly shielding the measuring cable, the voltage measuring device and the measured data processing system. Through the technical scheme, the shielding device for measuring the transient shell voltage of the GIS is provided; the influence of the electromagnetic interference is reduced; and the accuracy of measurement is improved.
Description
Technical field
The present invention relates to the measuring system of gas-insulated switchgear in the ultra-high voltage AC input transformation system (GIS) transient state sheath voltage (TEV), relate in particular to electromagnetic interference shield gas-insulated switchgear transient state sheath voltage measuring system.
Background technology
To have floor area little for gas-insulated switchgear in the ultra-high voltage AC input transformation system, good airproof performance, affected by environment little, the operational reliability height, time between overhauls(TBO) is long, and maintenance workload is few, the low remarkable advantage that waits of operating cost, electrical network has obtained widespread use in China, and successful Application to extra-high voltage experiment and demonstration engineering.When the disconnector among the GIS, grounding switch and breaker operator, produce the very steep capable ripple of wave head, catadioptric takes place repeatedly in these row ripples in GIS after, formation very fast transient overvoltage (VFTO).Propagate into positions such as earthing of casing lead-in wire junction, branch bar end as VFTO, because appearring in the impedance discontinuous GIS of making device housings over the ground, the transient state current potential raises, and will propagate along the transmission line of shell and the earth formation, further form TEV, this has very big harm to GIS device and contiguous equipment thereof, also can influence secondary device with the form of conduction and radiation.Therefore, be necessary GIS equipment transient state sheath voltage is effectively measured.
GB GB/T 18134.1-2000 " extremely fast impacting high-voltage test techniques-part 1: very-fast-front overvoltage measuring system in the gas insulated transformer substation " mentions for the measurement of transient state sheath voltage does not still have general measuring technique, only recommends to use electric field probe and resistive impedance voltage measuring apparatus to measure the transient state sheath voltage.At present domestic also do not have good measuring system to measure the transient state sheath voltage, used spherical electric field probe to measure the transient state sheath voltage both at home and abroad.
Yet, because the electric pressure height of ultra-high voltage AC input transformation system, GIS device structure complexity, electromagnetic interference (EMI) is brought very big interference to the resistive impedance partial pressure measuring apparatus of not considering electromagnetic shielding measure, the measurement result that obtains during serious interference can depart from actual actual value far away, cause measurement result insincere, therefore be necessary the resistive impedance partial pressure measuring apparatus is taked electromagnetic shielding measure.
Usually, use the electric field probe measurement to be applicable to the simple situation of GIS device structure, when GIS device structure complexity particularly was with branch bar, the electric field value that electric field probe is measured was difficult to obtain the transient state sheath voltage by the electric field inverting.Also the shielding of the measuring system of measuring GIS equipment transient state sheath voltage based on the resistive impedance dividing potential drop was not done at present both at home and abroad the introduction of system.
Summary of the invention
As mentioned above, the electromagnetic interference (EMI) adverse effect improves the accuracy of measuring when measuring GIS equipment in order to reduce, and it is a kind of for the shield assembly of measuring GIS equipment transient state sheath voltage system that expectation provides.
According to an aspect of the present invention, provide a kind of system that is used for measurement gas insulated switching installation transient state sheath voltage, it is characterized in that comprising: measured cable, be connected between the shell and voltage measuring apparatus of described gas-insulated switchgear; Voltage measuring apparatus is used to measure the voltage at described gas-insulated switchgear shell place; The Measurement and Data Processing system is used to handle the measurement data from described voltage measuring apparatus; Wherein, described measuring system comprises the shield assembly that integrally shields described measurement cable, described voltage measuring apparatus and described Measurement and Data Processing system.
According to an aspect of the present invention, the shielded box that described shield assembly comprises the shielding box of the screen layer that shields described measurement cable, the described voltage measuring apparatus of shielding and shields described Measurement and Data Processing system, described screen layer, described shielding box and described shielded box are connected by the connector that has function of shielding.
According to an aspect of the present invention, described screen layer, described shielding box and described shielded box are integrally formed.
According to an aspect of the present invention, the described connector that has function of shielding is BNC connector, connector.
According to an aspect of the present invention, described Measurement and Data Processing system uses free-standing power supply.
According to an aspect of the present invention, described free-standing power supply comprises accumulator and the inverter that is connected with described accumulator.
According to an aspect of the present invention, described free-standing power supply comprises solar cell and the inverter that is connected with described accumulator.
According to an aspect of the present invention, described shield assembly is made of metallic shield net or metal screen layer.
According to an aspect of the present invention, described Measurement and Data Processing system also comprises: be used for measured transient voltage data storage in storer and CPU (central processing unit) that measured data are analyzed; The storer that is used for storage of measurement data; The telecommunication unit that is used for correspondence with foreign country; Wherein said CPU (central processing unit) is analyzed measured data, and sends signal in response to measured data by described telecommunication unit.
By technique scheme, provide for the shield assembly of measuring GIS equipment transient state sheath voltage, reduced the influence of electromagnetic interference (EMI), improved the accuracy of measuring.
Description of drawings
To describe the preferred embodiments of the present invention at this, please refer to the diagram of enclosing.In the appended diagram of the present invention, identical reference number is promptly represented identical structural element.
Fig. 1 shows the synoptic diagram of measuring the measurement mechanism of GIS equipment transient state sheath voltage based on the resistive impedance dividing potential drop;
Fig. 2 A and 2B show the overlapping edges of shielded box of Measurement and Data Processing system and the synoptic diagram that perforate is handled;
Fig. 3 A-3C shows use shield assembly according to the present invention and measures and do not use shield assembly to measure resulting measurement result and show the simulated measurement result.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, and be not that intention limits the scope of the invention and uses.
The present invention proposes a kind of measuring system of GIS equipment transient state sheath voltage in the ultra-high voltage AC input transformation system.Fig. 1 schematically shows the synoptic diagram based on the measuring system of the GIS equipment transient state sheath voltage of resistive impedance partial pressure measuring apparatus.In accompanying drawing 1, Reference numeral 110 expression GIS device housings, the shielding box of Reference numeral 111 expression voltage measuring apparatus, Reference numeral 112 expression voltage measuring apparatus, Reference numeral 113 expression earth terminals, Reference numeral 114 expression ground leads, Reference numeral 115 expression grounded screens, Reference numeral 116 expression connectors, cable is measured in Reference numeral 117 expressions, and the screen layer of cable is measured in Reference numeral 118 expressions.As shown in Figure 1, Reference numeral 120 expression Measurement and Data Processing systems, wherein Reference numeral 121 is represented CPU (central processing unit), Reference numeral 122 expression sampling apparatuses, Reference numeral 123 expression independent current sources, Reference numeral 124 expression storeies, Reference numeral 125 expression umbilical cable, Reference numeral 126 expression GIS switch boards, the shielded box of Reference numeral 127 expression Measurement and Data Processing systems, Reference numeral 128 expression telecommunication units.
Fig. 1 shows the schematic block diagram according to measuring system of the present invention.As shown in Figure 1, the input end that draws the voltage measuring apparatus 112 in a cable 117 that has a screen layer 118 and the shielding box 111 from the measurement point of GIS device housings 110 links to each other, and the output terminal of voltage measuring apparatus 112 links to each other with Measurement and Data Processing system 120.The earth terminal 113 of voltage measuring apparatus 112 links to each other with grounded screen ground lead 114.Earth terminal 113 is meant the end points on the ground lead 114 voltage measuring apparatus 112, that be wired to grounded screen 115.Earth terminal connects should be reliable, the lead between earth terminal and the ground lead preferably as far as possible short.Preferably, this section lead is also taked shielding measure, as adopting shielded cable.In order further to reduce effect of electromagnetic radiation, preferred conductor length is less than 15 centimetres.Under abominable space electromagnetic environment, lead is short more, and the current potential of earth terminal and the current potential of ground lead can be consistent more.
As shown in the figure, cable and voltage measuring apparatus are all shielded, with the measuring error of avoiding outside electromagnetic interference (the particularly electromagnetic interference (EMI) of GIS equipment) to be brought.The screen layer of measuring cable can use metal level or wire netting to make, for example screen layer or the gauze screen made of metallic copper or zinc-plated metallic iron.The shielding box 111 of voltage measuring apparatus can for example, can use the galvanized iron of 2 millimeters thick to make shielding box by making with the screen layer identical materials of measuring cable, adopts solder technology at seam crossing.The shape of shielding box can adopt suitable shape arbitrarily, is used to hold measurement mechanism wherein.In one embodiment, shielding box is shaped as cuboid.
Also adopted shielding for Measurement and Data Processing system 120.In one embodiment, use 127 pairs of Measurement and Data Processing systems 120 of shielded box to shield.For example, designed shielded box 127 adopts the single-layer metal structures, and material is galvanized iron, the iron sheet of plating zinc on surface just, and thickness is 3 millimeters.Easy to carry in order to consider shielded box, seam crossing adopts overlapping technology, so detachable shielded box.The shape of shielded box 127 can be the rectangular parallelepiped type, is used to hold Measurement and Data Processing system 120 wherein, and in one embodiment, a kind of shielded box is of a size of the 700*600*900 millimeter, and another kind is the 550*500*650 millimeter.The casing place can perforate, so that directly link to each other with shielding box by connector, thereby avoids the space electromagnetic interference (EMI) to be radiated in the case by tapping.As shown in Figure 2, the door of shielded box adopts the overlap joint of invagination formula.When adopting invagination formula overlap joint, close the contact area that has increased metal behind the door, reduce the electromagnetic interference (EMI) that finedraw causes, improved shield effectiveness.In addition, can adopt various other connected modes, for example weld, rivet or the like.
As mentioned above, for shielding box and shielded box, the processing of the processing of each seam crossing, the processing of tapping and shielding chamber door is important for anti-electromagnetic interference (EMI).Shown in accompanying drawing 2A, for the edge of shielded box and shielding box, the structure that can adopt invagination strengthens the effect of shielding to increase contact area.In addition, although not shown in the accompanying drawing, also shielding box or shielded box can be designed to have the form of the shield door of being with draw-in groove.Accompanying drawing 2B shows the processing of the perforate when connecting by connector between the each several part of shield assembly.As shown in the figure, perforate can be passed the shielding box surface and be protruded from these surperficial both sides, and gauze screen or screen layer can be placed in the inboard of this bossing.Like this, between the connection of the each several part of shield assembly, also had appropriate shielding protection.Should be appreciated that the independent use of above-mentioned various measure all can promote the antijamming capability of this measuring system for radiation, and above-mentioned various measure can be used by independent assortment.
In one embodiment, the screen layer of cable 111 is connected with voltage measuring apparatus shielding box 116 by connector 116, and shielding box 116 is connected with shielded box 127 by connector 116.Connector 116 preferably has function of shielding and is used to resist extraneous electromagnetic interference.One embodiment of the present of invention have been used bnc connector.Bnc connector has guaranteed to have between screen layer, shielding box 111 and the shielded box 127 of shielded cable reliable connection and has been equipotential.Preferably, can be during fabrication that the shielding of cable and voltage measuring apparatus is one-body molded, thus seamless, omnibearing shielding are provided.For example, can form whole shield assembly by casting, and subsequently cable, voltage measuring apparatus and Measurement and Data Processing system be put into this bulk shielding facility.In another embodiment, integrally make the screen layer 118 of shielded cable, shielding box 111 and shielded box 127, and use this flexible material parcel total system to form shielding by in flexible insulating material, inserting and putting metallic shield net or metal screen layer.
As mentioned above, for whole measuring system provides shield assembly, this shield assembly comprises the screen layer that is used to measure cable, the shielded box that is used for the shielding box of voltage measuring apparatus and is used for data handling system.Above-mentioned screen layer, shielding box and shielded box integrally provide antijamming capability for electromagnetic radiation for the transient voltage measuring system of GIS equipment.
Voltage measuring apparatus 112 in the accompanying drawing 1 can comprise polytype voltage measuring apparatus.In one embodiment, can use the resistive impedance partial pressure measuring apparatus.Schematically illustrated as accompanying drawing 1, this resistive impedance partial pressure measuring apparatus is made of the resistance that is connected in series.Resistance R 1 and R2 have constituted bleeder circuit, and have determined intrinsic standoff ratio.Voltage signal in input is under the high frequency situations because the influence of the spuious emotional resistance that resistance, connecting line bring, preferably need for divider resistance configuration shunt capacitance to compensate the influence that spuious emotional resistance brings, improve the bandwidth of voltage divider.The rising edge of the transient state sheath voltage (TEV) of GIS equipment be nanosecond rank, frequency can reach tens high-voltage signal, can be this equipment disposition building-out capacitor.The value of building-out capacitor is generally 7～49pF, also can use into tunable capacitor.In one embodiment, the major parameter of the voltage divider that can select is: maximum high-voltage: 20kV DC/40kV peak value (just direct current is 20kV, and transient voltage peak is 40kV), bandwidth: 100MHz, rise time: 3.5nS.In another embodiment, can directly use can the commercial voltage probe that obtains, and for example: Tyke (Tektronix) P6015A high-voltage probe, product cause (pintech) P6039A high-voltage probe.Voltage measuring apparatus 112 can also comprise that other suitable being used to measure the type of device of GIS device housings voltage, for example, and the capacitive partial pressure measurement mechanism.
Measurement and Data Processing system 120 can comprise CPU (central processing unit) 121.CPU (central processing unit) 121 is used to handle the data from voltage measuring apparatus 112.In one embodiment, Measurement and Data Processing system 120 comprises sampling apparatus 122.Sampling apparatus can be the signal form that CPU (central processing unit) 121 can be handled with the conversion of signals of measuring from voltage measuring apparatus 112.Sampling apparatus 122 is ad/da converter optionally.In addition, sampling apparatus 122 can also be a data collecting card.In one embodiment, Measurement and Data Processing system 120 can comprise storer 124.Storer 124 is used for storing data according to the result of central processing unit for processing.In one embodiment, the Measurement and Data Processing system also comprises the display device (not shown), is used to show the result of measurement.In another embodiment, Measurement and Data Processing system 120 also comprises remote communication interface 128, be used for and PERCOM peripheral communication, so that for example the position of handled data, GIS equipment, GIS equipment mark symbol (for example, unique identifier) are transferred to remote location.In one embodiment, CPU (central processing unit) 121 in storer 124, and is analyzed measured transient voltage data storage to the transient voltage data of record, and take action when measurement data satisfies specified conditions.For example, when the shell transient voltage of GIS equipment surpasses a certain threshold value or the measurement result that in measurement result repeatedly, surpasses certain threshold level when surpassing some, by external communication interface 128, Measurement and Data Processing system 120 can send to long-range position with the structure of analyzing.Thus, the staff who is positioned at remote location will know situation and this residing position of GIS equipment of the sheath voltage of this GIS equipment.In case of necessity, the staff can handle to the scene rapidly, avoids dangerous generation.Although explained in detail not can be taked various suitable forms yet those skilled in the art are to be understood that communication herein, for example utilize wire communication, radio communication of various communication protocols or the like here.In one embodiment, Measurement and Data Processing system 120 comprise oscillograph and can with the matching used data collecting card of oscillograph.
In order further to reduce the influence of radiation, in the Measurement and Data Processing system, used free-standing power supply 123.In one embodiment, as shown in Figure 1, use accumulator to provide power supply as the Measurement and Data Processing system through inverter.In another embodiment, use solar cell to provide power supply as the Measurement and Data Processing system through inverter.In addition, jumbo independent current source can be provided by independent generator.In the prior art, use the conventional electric cabinet that connects to provide power supply as oscillograph.Yet there is shortcoming in such way, and the space electromagnetic interference (EMI) can be coupled on the power lead that connects between electric cabinet and the oscillograph, enters the oscillograph power port with conductive form, influences oscillographic operate as normal.Use independent current source then can reduce even eliminate this Conduction Interference greatly.
Accompanying drawing 3A-3C shows measuring system and the schematic representation of apparatus that proposes according to the present invention, arrange test on Wuhan state net extra-high-voltage alternating current demonstration 1000kV GIS test loop, base, the terminal housing of GIS equipment branch bar is to the transient state sheath voltage of grounded screen ground lead when measuring isolator operation.Seeing also accompanying drawing 3A, is 68.1kV at the transient state sheath voltage peak value of not considering to measure under the electromagnetic shielding measure situation of measurement mechanism.According to the present invention,, see also accompanying drawing 3B considering that the transient state sheath voltage peak value that measures under the measurement mechanism electromagnetic shielding measure situation is 10.8kV.And the simulation value of transient state sheath voltage is 12.4kV, shown in accompanying drawing 3C.When measurement mechanism has been considered electromagnetic shielding measure, can reduce the influence of electromagnetic interference (EMI) to measurement mechanism as can be seen, its measurement result more approaches simulation result; In conjunction with simulation result, the measuring system and the measurement mechanism that use the present invention to propose can be measured GIS equipment transient state sheath voltage, the correctness of confirmatory measurement method and the practicality of measurement mechanism accurately in conjunction with shield assembly.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. a system that is used for measurement gas insulated switching installation transient state sheath voltage is characterized in that, comprising:
Measure cable, be connected between the shell and voltage measuring apparatus of described gas-insulated switchgear;
Voltage measuring apparatus is used to measure the voltage at described gas-insulated switchgear shell place;
The Measurement and Data Processing system is used to handle the measurement data from described voltage measuring apparatus;
Wherein, described measuring system comprises the shield assembly that integrally shields described measurement cable, described voltage measuring apparatus and described Measurement and Data Processing system.
2. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 1, it is characterized in that, the shielded box that described shield assembly comprises the shielding box of the screen layer that shields described measurement cable, the described voltage measuring apparatus of shielding and shields described Measurement and Data Processing system, described screen layer, described shielding box and described shielded box are connected by the connector that has function of shielding.
3. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 2 is characterized in that described screen layer, described shielding box and described shielded box are integrally formed.
4. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 2 is characterized in that the described connector that has function of shielding is a BNC connector.
5. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 1 is characterized in that, described Measurement and Data Processing system uses free-standing power supply.
6. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 5 is characterized in that, described free-standing power supply comprises accumulator and the inverter that is connected with described accumulator.
7. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 5 is characterized in that, described free-standing power supply comprises solar cell and the inverter that is connected with described accumulator.
8. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 1 is characterized in that, described shield assembly constitutes by insert and put the metallic shield network in flexible insulating material.
9. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 1 is characterized in that described shield assembly constitutes by insert and put metal screen layer in flexible insulating material.
10. the system that is used for measurement gas insulated switching installation transient state sheath voltage as claimed in claim 1 is characterized in that, described Measurement and Data Processing system also comprises:
Be used for measured transient voltage data storage in storer and CPU (central processing unit) that measured data are analyzed;
The storer that is used for storage of measurement data;
The telecommunication unit that is used for correspondence with foreign country;
Wherein said CPU (central processing unit) is analyzed measured data, and sends signal in response to measured data by described telecommunication unit.
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| CN2010105774208A CN102121948A (en) | 2010-12-07 | 2010-12-07 | System for measuring transient shell voltage of gas insulated switchgear |
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| CN2010105774208A CN102121948A (en) | 2010-12-07 | 2010-12-07 | System for measuring transient shell voltage of gas insulated switchgear |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102590678A (en) * | 2012-02-27 | 2012-07-18 | 华北电力大学 | Electromagnetic disturbance measurement system for secondary system of alternating current power transmission line series compensation device platform |
| CN102608401A (en) * | 2012-03-06 | 2012-07-25 | 华北电力大学 | Measurement system and measurement method for disturbance voltage and disturbance current of GIS (gas insulated switchgear) secondary system |
| CN104360192A (en) * | 2014-11-12 | 2015-02-18 | 华北电力大学 | Electromagnetic disturbance waveform feature extracting method for transformer substation gas insulation switch |
| CN104897947A (en) * | 2015-06-11 | 2015-09-09 | 西安交通大学 | High-voltage differential measurement device |
| CN105067976A (en) * | 2015-08-05 | 2015-11-18 | 国家电网公司 | Cable GIS terminal integral prefabricated AC withstand voltage testing device |
| CN105160172A (en) * | 2015-08-31 | 2015-12-16 | 国家电网公司 | Calculation method for electromagnetic disturbance of intelligent component ports of GIS substation |
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| CN112449677A (en) * | 2018-11-20 | 2021-03-05 | Abb瑞士股份有限公司 | Device for monitoring the temperature and voltage of a cable joint of a cable connected to a gas-insulated switchgear and associated manufacturing method |
| CN112730951A (en) * | 2020-12-29 | 2021-04-30 | 国网陕西省电力公司电力科学研究院 | Method for measuring TEV and TGPR in gas insulated substation |
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