CN103235166B - Hand-hole type capacitive voltage divider - Google Patents

Hand-hole type capacitive voltage divider Download PDF

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Publication number
CN103235166B
CN103235166B CN201310134226.6A CN201310134226A CN103235166B CN 103235166 B CN103235166 B CN 103235166B CN 201310134226 A CN201310134226 A CN 201310134226A CN 103235166 B CN103235166 B CN 103235166B
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China
Prior art keywords
hand
induction electrode
cover plate
insulcrete
hole cover
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Expired - Fee Related
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CN201310134226.6A
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Chinese (zh)
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CN103235166A (en
Inventor
岳功昌
陈维江
刘卫东
戴敏
关永刚
张高潮
张友朋
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Tsinghua University
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Henan Pinggao Electric Co Ltd
Original Assignee
Tsinghua University
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Henan Pinggao Electric Co Ltd
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Application filed by Tsinghua University, State Grid Corp of China SGCC, China Electric Power Research Institute Co Ltd CEPRI, Henan Pinggao Electric Co Ltd filed Critical Tsinghua University
Priority to CN201310134226.6A priority Critical patent/CN103235166B/en
Publication of CN103235166A publication Critical patent/CN103235166A/en
Application granted granted Critical
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Abstract

The invention provides a kind of Hand-hole type capacitive voltage divider, comprise induction electrode, hand hole cover plate and cable splice, induction electrode is fixedly mounted on hand hole cover plate, and induction electrode is electrically connected with cable splice, insulation film is provided with between induction electrode and hand hole cover plate, insulate between induction electrode and hand hole cover plate, Hand-hole type capacitive voltage divider also comprises: insulcrete, is arranged between induction electrode and hand hole cover plate; First O-ring seal, is arranged between insulcrete and the surface of contact of induction electrode to carry out air seal between insulcrete and induction electrode; Second O-ring seal, to carry out air seal between insulcrete and hand hole cover plate between the surface of contact being arranged on insulcrete and hand hole cover plate.Present invention efficiently solves the problem that in prior art, Hand-hole type capacitive voltage divider low-voltage arm parallel resistance is low, and then meet the low frequency characteristic of Hand-hole type capacitive voltage divider.

Description

Hand-hole type capacitive voltage divider
Technical field
The present invention is specifically related to a kind of Hand-hole type capacitive voltage divider.
Background technology
Gas insulation metal seal combined electrical apparatus (Gas Insulated Substation, be called for short GIS) be a large amount of substation equipment used in electric system, it is integrated for the power equipment elements such as isolating switch, disconnector, grounding switch, voltage transformer (VT), current transformer, lightning arrester and bus and be sealed in a metal enclosed container, fills the SF with high pressure 6gas, realizes facility compact and safe reliability.
When isolating switch in GIS and disconnector carry out closing with breaking operation, prebreakdown and the repeated breakdown in switch contact gap can be there is.Puncturing of switch contact gap can produce high steepness and high-frequency electro-magnetic transient in GIS inside, is called very fast transient (Very Fast Transient is called for short VFT).The voltage of VFT considerably beyond the normal operating voltage of converting station electric power equipment, can cause apparatus insulated damage; VFT can also be coupled into the Control protection system of transformer station, the normal work of interference Control protection system, and may cause device damage.Therefore need to measure the VFT of transformer station and analyze, and take measures to suppress.In GIS, the measurement of VFT needs wide measurement frequency band.The frequency of VFT can up to several 10MHz; VFT is superimposed upon on power-frequency voltage, and the measurement of VFT needs to measure power-frequency voltage component simultaneously.Therefore, VFT measurement needs the measurement frequency band of several Hz to hundred MHz.
To the measurement of VFT in GIS, prior art mainly adopts Hand-hole type capacitive voltage divider, as depicted in figs. 1 and 2, the metal shell 2 of the central conductor leader 1 that GIS bus comprises and ground connection is coaxial configuration to the basic structure of GIS, and VFT appears between central conductor leader and metal shell.The Hand-hole type capacitive voltage divider that VFT measures is made up of the hand hole 3 on GIS metal shell, hand hole cover plate 4, induction electrode 5, insulation film 6, set bolt 7, bolt washer 8 and cable splice 9, induction electrode 5 is arranged on hand hole cover plate 4, insulation film 6 is had between induction electrode 5 and hand hole cover plate 4, the set bolt 7 of induction electrode has insulating washer 8, makes to insulate between induction electrode and hand hole cover plate.Stray capacitance between induction electrode 5 and central conductor leader 1 forms the high voltage arm capacitor of capacitive divider, electric capacity between induction electrode 5 and hand hole cover plate 4 forms the low-voltage arm electric capacity of capacitive divider, it is external that voltage division signal on induction electrode outputs to GIS by cable splice 9, inputs to survey record equipment.
Between induction electrode 5 and hand hole cover plate 4, have employed O-ring seal 10, solve the air seal problem of cable end position, avoid the high pressure SF in GIS 6gas leaks from cable end 9.
For the Hand-hole type capacitive voltage divider structure of the prior art shown in Fig. 3, the insulation resistance between induction electrode 5 and hand hole cover plate 4 is subject to the restriction of O-ring seal 10.In figure 3, insulation film 6, insulating washer 8 and O-ring seal 10 are depended in the insulation between induction electrode 5 and hand hole cover plate 4.The SF of GIS 6air seal mainly uses nitrile rubber and ethylene-propylene-diene rubber at present, and the resistivity of these two kinds of elastomeric materials is lower, is difficult to obtain enough large insulation resistance, creates restriction to the low frequency characteristic of Hand-hole type capacitive voltage divider.
Summary of the invention
The present invention aims to provide a kind of Hand-hole type capacitive voltage divider, to solve the problem that in prior art, Hand-hole type capacitive voltage divider low-voltage arm parallel resistance is low, and then meets the low frequency characteristic of Hand-hole type capacitive voltage divider.
To achieve these goals, the invention provides a kind of Hand-hole type capacitive voltage divider, comprise induction electrode, hand hole cover plate and cable splice, induction electrode is fixedly mounted on hand hole cover plate, and induction electrode is electrically connected with cable splice, between induction electrode and hand hole cover plate, be provided with insulation film, insulate between induction electrode and hand hole cover plate, Hand-hole type capacitive voltage divider also comprises: insulcrete, is arranged between induction electrode and hand hole cover plate; First O-ring seal, is arranged between insulcrete and the surface of contact of induction electrode to carry out air seal between insulcrete and induction electrode; Second O-ring seal, to carry out air seal between insulcrete and hand hole cover plate between the surface of contact being arranged on insulcrete and hand hole cover plate.
Further, hand hole cover plate is provided with the first ring groove for fitting insulating panels on the side of induction electrode, and insulcrete is arranged in the first ring groove.
Further, induction electrode is provided with the second ring groove for fitting insulating panels on the side of hand hole cover plate, and insulcrete is arranged in the second ring groove.
Further, hand hole cover plate is provided with the first ring groove for fitting insulating panels on the side of induction electrode, induction electrode is provided with the second ring groove for fitting insulating panels on the side of hand hole cover plate, first ring groove and the second ring groove surround container cavity jointly, and insulcrete is arranged in container cavity.
Further, induction electrode is fixedly mounted on hand hole cover plate by set bolt, is provided with insulating washer to make to insulate between induction electrode and hand hole cover plate between induction electrode and set bolt.
Further, the first O-ring seal and the second O-ring seal are elasticity resistant material.
Apply technical scheme of the present invention, Hand-hole type capacitive voltage divider comprises induction electrode, hand hole cover plate and cable splice, induction electrode is fixedly mounted on hand hole cover plate, and induction electrode is electrically connected with cable splice, insulation film is provided with between induction electrode and hand hole cover plate, insulate between induction electrode and hand hole cover plate, Hand-hole type capacitive voltage divider also comprises: insulcrete, is arranged between induction electrode and hand hole cover plate; First O-ring seal, is arranged between insulcrete and the surface of contact of induction electrode to carry out air seal between insulcrete and induction electrode; Second O-ring seal, to carry out air seal between insulcrete and hand hole cover plate between the surface of contact being arranged on insulcrete and hand hole cover plate.An insulcrete is set between induction electrode and hand hole cover plate, the first O-ring seal is set respectively in the two sides of insulcrete and the second O-ring seal carries out air seal, ensure that high pressure SF by the first O-ring seal and the second O-ring seal 6under the prerequisite that gas cannot leak from cable splice, because insulcrete material can select the material that resistivity is very high, insulation resistance between induction electrode and hand hole cover plate is obtained increase, and then improve low-voltage arm parallel resistance R, meet the low frequency characteristic of Hand-hole type capacitive voltage divider.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows Hand-hole type capacitive voltage divider structural representation of the prior art;
Fig. 2 shows the side-looking structural representation of the Hand-hole type capacitive voltage divider of Fig. 1;
Fig. 3 shows the structure for amplifying schematic diagram of the Hand-hole type capacitive voltage divider of Fig. 1;
Fig. 4 shows the schematic equivalent circuit of Hand-hole type capacitive voltage divider;
Fig. 5 shows the inner structure schematic diagram of the first embodiment of Hand-hole type capacitive voltage divider of the present invention;
Fig. 6 shows the inner structure schematic diagram of the second embodiment of Hand-hole type capacitive voltage divider of the present invention;
Fig. 7 shows the inner structure schematic diagram of the 3rd embodiment of Hand-hole type capacitive voltage divider of the present invention.
Reference numeral in above accompanying drawing is specific as follows:
10, induction electrode; 20, hand hole cover plate; 30, cable splice; 40, insulcrete; 50, the first O-ring seal; 60, the second O-ring seal; 70, set bolt; 80, insulating washer; 91, the first ring groove; 92, the second ring groove.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The equivalent electrical circuit of Hand-hole type capacitive voltage divider as shown in Figure 4, wherein: C hbeing high voltage arm capacitor, is the stray capacitance between induction electrode and central conductor leader; C lbeing low-voltage arm electric capacity, is the electric capacity between induction electrode and hand hole cover plate; R is the parallel resistance of low-voltage arm electric capacity, and it depends on the insulation resistance between induction electrode and hand hole cover plate, and the input impedance of survey record equipment.For the bleeder circuit shown in Fig. 4, Amplitude Frequency Characteristic is:
| H ( jω ) | = | U OUT U IN | = ω RC H 1 + ω 2 R 2 C L 2
This formula shows, when frequency is very high, and ω RC lduring >>1, Amplitude Frequency Characteristic is approximately constant | H (j ω) | and=C hc l; Along with frequency reduces, Amplitude Frequency Characteristic reduces, and 3dB frequency of fadings is:
f 3 dB = 1 2 π RC L
As can be seen here, the frequency characteristic of the Hand-hole type capacitive voltage divider that extend downwards, needs to improve low-voltage arm electric capacity C l, or improve low-voltage arm Capacitance parallel connection resistance R.
C lbe the electric capacity between induction electrode and hand hole cover plate, depend on the specific inductive capacity of the area of induction electrode, the thickness of insulation film and insulating film material, be difficult to accomplish very large.Be connected in parallel between induction electrode and hand hole cover plate according to lumped parameter capacitor, then easily cause the parasitic higher-order of oscillation.Therefore, low-voltage arm electric capacity C is significantly improved lhave difficulties, the low-voltage arm parallel resistance R improving Hand-hole type capacitive voltage divider must be managed.
Hand-hole type capacitive voltage divider low-voltage arm parallel resistance R is decided by the insulation resistance between induction electrode and hand hole cover plate, and the input impedance of survey record equipment.Adopt impedance inverter circuit, the input impedance of survey record equipment can be brought up to the G Ω order of magnitude.Main difficulty comes from cable end place SF 6the O-ring seal of air seal.
The present invention proposes a kind of embodiment of Hand-hole type capacitive voltage divider, specifically see Fig. 5, the Hand-hole type capacitive voltage divider of the present embodiment can improve low-voltage arm parallel resistance R, eliminate the low impact on Hand-hole type capacitive voltage divider low-voltage arm parallel resistance of O-ring seal insulation resistance, and then extension Hand-hole type capacitive voltage divider low frequency characteristic, the concrete structure of the Hand-hole type capacitive voltage divider of the present embodiment is as follows:
Hand-hole type capacitive voltage divider comprises induction electrode 10, hand hole cover plate 20 and cable splice 30, induction electrode 10 is fixedly mounted on hand hole cover plate 20, and induction electrode 10 is electrically connected with cable splice 30, insulation film is provided with between induction electrode 10 and hand hole cover plate 20, insulate between induction electrode 10 and hand hole cover plate 20, Hand-hole type capacitive voltage divider also comprises insulcrete 40, first O-ring seal 50 and the second O-ring seal 60, insulcrete 40 is arranged between induction electrode 10 and hand hole cover plate 20, to carry out air seal between insulcrete 40 and induction electrode 10 between the surface of contact that first O-ring seal 50 is arranged on insulcrete 40 and induction electrode 10, to carry out air seal between insulcrete 40 and hand hole cover plate 20 between the surface of contact that second O-ring seal 60 is arranged on insulcrete 40 and hand hole cover plate 20.Hand hole cover plate 20 be provided with pass for cable splice 30 dodge hole, insulcrete, the first O-ring seal and the second O-ring seal are all ringwise to be set on cable splice 30.
An insulcrete is set between induction electrode and hand hole cover plate, the first O-ring seal is set respectively in the two sides of insulcrete and the second O-ring seal carries out air seal, ensure that high pressure SF by the first O-ring seal and the second O-ring seal 6under the prerequisite that gas cannot leak from cable splice, because insulcrete material can select the material that resistivity is very high, insulation resistance between induction electrode and hand hole cover plate is obtained increase, and then improve low-voltage arm parallel resistance R, meet the low frequency characteristic of Hand-hole type capacitive voltage divider.
Further preferably, hand hole cover plate 20 is provided with the first ring groove 91 for fitting insulating panels 40 to the present embodiment on the side of induction electrode 10, and insulcrete 40 is arranged in the first ring groove 91.And hand hole cover plate 20 is also provided with the first mounting groove of placement first O-ring seal accordingly according to the position of the first ring groove 91, induction electrode 10 is provided with the second mounting groove according to the second O-ring seal equally, even if make to be provided with the first insulcrete and two O-ring seals, between induction electrode 10 and hand hole cover plate 20, sealing effectiveness can be reached by being sealed and matched of insulation film.Induction electrode 10 is fixedly mounted on hand hole cover plate 20 by set bolt 70, is provided with insulating washer 80 to make to insulate between induction electrode 10 and hand hole cover plate 20 between induction electrode 10 and set bolt 70.First O-ring seal 50 and the second O-ring seal 60 are elasticity resistant material.
Present invention also offers the second embodiment of Hand-hole type capacitive voltage divider, specifically see Fig. 6, the Hand-hole type capacitive voltage divider of the second embodiment is substantially identical with the structure of the first embodiment, include induction electrode 10, hand hole cover plate 20, cable splice 30, insulcrete 40, first O-ring seal 50 and the second O-ring seal 60, and the annexation between parts is substantially identical with the first embodiment, the difference of the second embodiment and the first embodiment is only, induction electrode 10 is provided with the second ring groove 92 for fitting insulating panels 40 on the side of hand hole cover plate 20, insulcrete 40 is arranged in the second ring groove 92.The Hand-hole type capacitive voltage divider technique effect of the second embodiment is basically the same as those in the first embodiment.
Present invention also offers the 3rd embodiment of Hand-hole type capacitive voltage divider, specifically see Fig. 7, the Hand-hole type capacitive voltage divider of the 3rd embodiment is substantially identical with the structure of the first embodiment, include induction electrode 10, hand hole cover plate 20, cable splice 30, insulcrete 40, first O-ring seal 50 and the second O-ring seal 60, and the annexation between parts is substantially identical with the first embodiment, the difference of the 3rd embodiment and the first embodiment is only, hand hole cover plate 20 is provided with the first ring groove 91 for fitting insulating panels 40 on the side of induction electrode 10, induction electrode 10 is provided with the second ring groove 92 for fitting insulating panels 40 on the side of hand hole cover plate 20, first ring groove 91 and the second ring groove 92 surround container cavity jointly, insulcrete 40 is arranged in container cavity.The Hand-hole type capacitive voltage divider technique effect of the 3rd embodiment is basically the same as those in the first embodiment.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a Hand-hole type capacitive voltage divider, comprise induction electrode (10), hand hole cover plate (20) and cable splice (30), described induction electrode (10) is fixedly mounted on described hand hole cover plate (20), and described induction electrode (10) is electrically connected with described cable splice (30), insulation film is provided with between described induction electrode (10) and described hand hole cover plate (20), insulate between described induction electrode (10) and described hand hole cover plate (20), it is characterized in that, described Hand-hole type capacitive voltage divider also comprises:
Insulcrete (40), is arranged between described induction electrode (10) and described hand hole cover plate (20);
First O-ring seal (50), to carry out air seal between described insulcrete (40) and described induction electrode (10) between the surface of contact being arranged on described insulcrete (40) and described induction electrode (10);
Second O-ring seal (60), to carry out air seal between described insulcrete (40) and described hand hole cover plate (20) between the surface of contact being arranged on described insulcrete (40) and described hand hole cover plate (20).
2. Hand-hole type capacitive voltage divider according to claim 1, it is characterized in that, described hand hole cover plate (20) is provided with the first ring groove (91) for installing described insulcrete (40) on the side of described induction electrode (10), and described insulcrete (40) is arranged in described first ring groove (91).
3. Hand-hole type capacitive voltage divider according to claim 1, it is characterized in that, described induction electrode (10) is provided with the second ring groove (92) for installing described insulcrete (40) on the side of described hand hole cover plate (20), and described insulcrete (40) is arranged in described second ring groove (92).
4. Hand-hole type capacitive voltage divider according to claim 1, it is characterized in that, described hand hole cover plate (20) is provided with the first ring groove (91) for installing described insulcrete (40) on the side of described induction electrode (10), described induction electrode (10) is provided with the second ring groove (92) for installing described insulcrete (40) on the side of described hand hole cover plate (20), described first ring groove (91) and described second ring groove (92) surround container cavity jointly, and insulcrete (40) is arranged in described container cavity.
5. Hand-hole type capacitive voltage divider according to claim 1, it is characterized in that, described induction electrode (10) is fixedly mounted on described hand hole cover plate (20) by set bolt (70), is provided with insulating washer (80) to make to insulate between described induction electrode (10) and hand hole cover plate (20) between described induction electrode (10) and described set bolt (70).
6. Hand-hole type capacitive voltage divider according to claim 1, is characterized in that, described first O-ring seal (50) and described second O-ring seal (60) are elasticity resistant material.
CN201310134226.6A 2013-04-17 2013-04-17 Hand-hole type capacitive voltage divider Expired - Fee Related CN103235166B (en)

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CN105200517A (en) * 2015-10-29 2015-12-30 江苏美科硅能源有限公司 Heightening device for increasing feeding amount of polycrystal furnace
CN106199120B (en) * 2016-06-22 2018-10-26 西北核技术研究所 Interpolation type thin-film capacitor voltage divider
CN106019199B (en) * 2016-06-30 2019-12-27 中国电力科学研究院 Annular capacitive voltage divider for linearity calibration of impulse voltage divider
CN107064590B (en) * 2016-12-23 2019-08-06 芜湖国睿兆伏电子有限公司 A kind of Portable dry capacitive divider
CN106645876A (en) * 2016-12-29 2017-05-10 国家电网公司 Measurement system and measurement method for high-frequency transit voltage in GIS
CN110441575B (en) * 2019-05-28 2022-09-27 中国电力科学研究院有限公司 GIS electronic voltage transformer of common-box type gas-insulated metal-enclosed switchgear
CN110426547B (en) * 2019-06-24 2022-09-27 中国电力科学研究院有限公司 Broadband GIS electronic voltage transformer device and measuring method

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