CN203561668U - Coupling capacitance voltage divider with potential gradient shielding - Google Patents
Coupling capacitance voltage divider with potential gradient shielding Download PDFInfo
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- CN203561668U CN203561668U CN201320713774.XU CN201320713774U CN203561668U CN 203561668 U CN203561668 U CN 203561668U CN 201320713774 U CN201320713774 U CN 201320713774U CN 203561668 U CN203561668 U CN 203561668U
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Abstract
The utility model provides a coupling capacitance voltage divider with potential gradient shielding. The voltage divider comprises a high voltage end shielding ring, an upper flange, a device body, a pedestal and a junction box. The high voltage end shielding ring is located on a top of the device body and is connected with the device body through the upper flange. A bottom of the device body is fixed on the pedestal. The junction box is arranged on the pedestal. On the basis of reducing a capacitance of the coupling capacitance voltage divider, a voltage division ratio of the voltage divider is not influenced by an external object and an electric field change. The utility model provides the coupling capacitance voltage divider with the potential gradient shielding. The voltage divider can be served as a coupling capacitor for EVT so as to increase a capability of tolerating a transient process of a secondary system of the EVT; the voltage divider can also be served as a supporting insulator possessing a voltage divider function and the insulator is used for monitoring a voltage of a transformer substation, measuring a power grid transient overvoltage and carrying out one-time voltage monitoring on the transformer substation and line system debugging; and the voltage divider can be used in a low-power-consumption CVT with a high insulating property.
Description
Technical field
The utility model relates to a kind of voltage divider, specifically relates to a kind of coupling capacitance voltage divider with electric potential gradient shielding.
Background technology
The remaining inductance of the stake resistance of transformer station and earth mat, more much bigger than the impedance ground of the High-Voltage Experimentation chamber of function admirable, even differ one to two order of magnitude.When transient overvoltage appears in electrical network, can cause that by the pulse current of capacitive apparatus current potential moment of capacitive apparatus earth terminal raises, this phenomenon, for the voltage divider kind equipment at the earthy secondary device of what is called, can produce great harm.
Feature of intelligent grid is originally away from the backstage secondary device of primary equipment, to move forward near primary equipment, and to comprise a large amount of state monitoring apparatus, to realize the intellectuality of the equipment such as transformer, switch, combined electrical apparatus (GIS).
Electrical secondary system, condition monitoring system etc. belong to weak electricity system.The grounded screen of transformer station is not at every moment in earth potential state, have remaining inductance, and DC ground resistance is also in ohm quantity between it and earth potential.When primary equipment (transformer, switch, when mutual inductors etc.) high-pressure side entrance equivalent capacity is larger, in electrical network generation transient state process (as Lightning Over-voltage, switching overvoltage etc.) under effect, due to the existence of the remaining inductance of grounded screen and stake resistance, may there is the phenomenon that instant electric potential raises in the earth terminal of primary equipment.The earth potential of this transient state process raises, for primary equipment, endanger itself and not quite, but earthy moment raise, very harmful near the weak electricity system of installing primary equipment.Because the rising of instant electric potential can produce larger potential difference (PD) between weak electricity system signal input part and the earth potential of working power.Past often notes improving the limited amplitude protection of signal input part, improves the dielectric level of signal input part and power supply, signal transmission, self components and parts, does not but note the inhibition of above earth potential moment rising.
For traditional mutual inductor; while meeting with this transient overvoltage; high-frequency interferencing signal is the secondary lead wires transmission to hundreds of meters through tens of rice; superpotential has all decayed substantially; protective relaying device, watt-hour meter, measuring instrument and aut.eq. that backstage is connected, the extent of injury of formation reduces greatly.
The digitizing of electronic mutual inductor or mutual inductor is key character of intelligent grid.Be with the difference of conventional electric power mutual inductor, near many digitizings of type electric power mutual-inductor or the electrical secondary system of electronic mutual inductor (weak current equipment) move forward to primary equipment from backstage.For digitized electric power mutual-inductor and electronic mutual inductor, electrical secondary system device is installed on the spot, various superpotential, the more superpotential of high fdrequency component that particularly isolator operation produces, causing the earth potential moment rising of primary equipment earth terminal,, there is the phenomenons such as mess code, deadlock, information dropout in the electrical secondary system of serious threat electronic mutual inductor, even cause secondary device damage, badly influence the development of intelligent grid.The EVT of capacitance partial pressure type of take is example, and electrical secondary system is connected with the low pressure end of coupling capacitance voltage divider, and the electric capacity of coupling capacitance voltage divider is larger, and transient state process causes coupling capacitance voltage divider earth potential moment raises more serious.If reduce the electric capacity of coupling capacitance voltage divider, external electric field is disturbed and can be caused again the error of coupling capacitance voltage divider to increase.
Application number is that 201080046212.3 patent discloses a kind of ground shield capacitor, comprises the first reference voltage that is coupled to the first metal layer and the second reference voltage that is coupled to the second metal level; The first finger type in a plurality of finger pieces is coupled to the first metal layer and is coupled to the first metal layer and the second metal level at second area in first area; The second finger type in a plurality of finger pieces is coupled to the second metal level in first area and is coupled to the first metal layer and the second metal level at second area; Other the first finger type and the second finger type positioned alternate are in side each other.Ground shield capacitor principal feature is: capacitor tundish, containing active device, finally reaches the capacitance of needs by the stack of electric capacity, and by center terminal ground connection, so be called ground shield capacitor.But this ground shield capacitor does not have active device, the stack of coupling capacitance amount that neither be by layer reaches final capacitance, and electric capacity just produces in capacitance shield pipe pressing process, not by outside stack.
Application number is that 201110189935.5 patent of invention discloses a kind of power capacitor with noise shielding device, and it comprises power capacitor and described housing; The bottom of housing is provided with bottom shield layer, and the shape of bottom shield layer and housing bottom matches; The top of housing is provided with top cover screen layer, and the end shape of top cover screen layer and housing matches.This invention bottom shield layer is installed on bottom outside housing or the bottom in housing, and top cover screen layer is installed on top outside housing or the top in housing; Bottom shield layer and top cover screen layer are all made by foamed aluminium, and the material of bottom shield layer and top cover screen layer is ultralight, can sound-absorbing sound insulation, the electromagnetic effect of energy-absorbing and electronic shield, the spectral range of absorption of noise is wide, and can not affect the ventilation and heat of power capacitor, can reduce the noise level of power capacitor, simple and compact for structure, easy to install, shield effectiveness is good, long service life, use cost is low, safe and reliable.
Its principal feature is: the physical Design of bottom shield layer and top cover screen layer, the outstanding material using is that foamed aluminium is made, material is ultralight, can sound-absorbing sound insulation, the electromagnetic effect of energy-absorbing and electronic shield, the spectral range of absorption of noise is wide, and can not affect the ventilation and heat of power capacitor, can reduce the noise level of power capacitor.Belong to the application of material.
Application number is that 201110451815.8 patent discloses a kind of separated inverted standard capacitor with voltage division shielding, provide a kind of high insulation resistance, can be under rated voltage unrestricted time operation, high precision, movably with the separated inverted standard capacitor of voltage division shielding.Comprise High Pressure Shell, insulating supporting sleeve pipe and band steamboat base.High Pressure Shell is the high-field electrode of capacitor, and high-field electrode and low-field electrode are all processed by aluminium alloy, and size is accurate, and electric capacity is stable; Insulating supporting sleeve pipe is the hollow combined insulator of integral injection molding, and inside installs bipolar voltage division shielding additional, has high electric insulation intensity; Heavy-duty universal wheel is installed on the base of bottom, can moves easily.It adopts the structural design EVT voltage divider part of inverted standard capacitor, can effectively improve the reliability of EVT, but for electric pressure, be greater than the situation of 220kV, inverted standard capacitor inside configuration Electric Field Distribution is not as good as coupling condenser even structure, accident rate is high, and cost is also expensive.
Application number is that the patent of invention of 201210069310.X discloses a kind of Portable double-shielding standard capacitor, and it can change measured sleeve pipe electric field in the past and disturb large, the poor drawback of processing safety, effectively improved the reliability of measurement data.Comprise capacitor and screen layer, be provided with internal shield in insulation burrel, internal shield inside is filled with SF
6insulating gas, is provided with capacitor group in internal shield; Grading shield is established on insulation burrel top, and insulator foot is established in insulation burrel bottom; Capacitor group one end leads to grading shield, and the other end leads to the measuring junction being located on insulation burrel; The outside bag of capacitor group is established polyester heat resistant adhesive tape.
Its principal feature is: comprise capacitor and screen layer, be provided with internal shield in insulation burrel, the inside of internal shield is filled with SF
6insulating gas, is provided with capacitor group in internal shield; Insulation burrel top is provided with grading shield, and insulation burrel bottom is provided with insulator foot; Capacitor group one end leads to grading shield, and the capacitor group other end leads to the measuring junction being located on insulation burrel; The outside bag of capacitor group is provided with polyester heat resistant adhesive tape.
Coupling capacitance voltage divider is mainly used in measuring alternating voltage, not only for indoor laboratory examination and substation field test, and also can be in CVT and EVT.Whether the interference source of external electric field is a lot, as charged in faced mutually equipment, the distributed capacitance that high-voltage connection produces, and the height that coupling capacitance voltage divider is settled and periphery object etc., all can have impact to the intrinsic standoff ratio of coupling capacitance voltage divider.When testing, northwest article one 750kV circuit switch finds, the CVT being formed by coupling capacitance voltage divider and electromagnetic unit, and the change of high-voltage connection position, makes graph of errors that 0.38% skew occur.In the past in order to reduce the disturbing effect of external electric field to CVT error characteristics, often adopt the method that increases coupling condenser electric capacity, this has not only increased manufacturing cost, technique and the test difficulty of equipment, also the design of unfavorable coupling capacitance voltage divider unit components field intensity.
Utility model content
On the basis of electric capacity that reduces coupling capacitance voltage divider, the intrinsic standoff ratio that guarantees voltage divider is not affected by external object and electric field change, the utility model provides a kind of coupling capacitance voltage divider with electric potential gradient shielding, can be used as coupling condenser for EVT, to improve the ability of EVT electrical secondary system tolerance transient state process; Also can be used as the support insulator with function of voltage divider, for the monitoring of transformer substation voltage and the measurement of electrical network transient overvoltage, for the primary voltage monitoring of transformer station and line system debugging; Can also be for the higher low-power consumption CVT of insulating property.
To achieve these goals, the utility model is taked following scheme:
The utility model provides a kind of coupling capacitance voltage divider with electric potential gradient shielding, and described voltage divider comprises high-pressure side shading ring, upper flange, device body, base and terminal box; Described high-pressure side shading ring is positioned at described device body top, by upper flange, is connected with described device body; Described device body bottom is fixed on described base, and described set of terminal box is on described base.
Described device body comprises sleeve pipe, device body body, band electric potential gradient shielding cylinder and low pressure end shading ring; Described band electric potential gradient shielding cylinder, low pressure end shading ring and sleeve pipe are from inside to outside set in turn in described device body body outside, and described band electric potential gradient shielding cylinder is parallel with described low pressure end shading ring, and perpendicular to described base setting.
Described device body body interior is full of insulating medium, and described insulating medium is oiliness insulating medium and gas-insulated medium.
Described sleeve pipe comprises epoxy fibreglass cylinder and cluster parachute; It is inner that described epoxy fibreglass cylinder is positioned at described cluster parachute, the fluid silicone rubber cluster parachute that described cluster parachute is integrated poured moulding; On described cluster parachute, the distance of every two umbrellas between stretching out is between 50～100mm.
The length of described sleeve pipe equates with the described height with electric potential gradient shielding cylinder.
Described band electric potential gradient shielding cylinder comprises splicing ear, ring shielding layer, cable paper and abutment ring; Described splicing ear is positioned at described ring shielding layer upper end, and it is outside that described cable paper is wrapped in described ring shielding layer, and described band electric potential gradient shielding cylinder is connected with upper flange by described splicing ear, and is connected with base by described abutment ring.
Described band electric potential gradient shielding cylinder is provided with 1～3, and adjacent is 15～25mm with the spacing between electric potential gradient shielding cylinder.
Described device body body comprises electric capacity and metal connecting sheet, connects, and fix with insulating support and binding strap between every two electric capacity by described metal connecting sheet.
Described high-pressure side shading ring and low pressure end shading ring all adopt grading ring.
Compared with prior art, the beneficial effects of the utility model are:
1. compared with prior art, electric capacity in the utility model just produces in capacitance shield pipe pressing process, not by outside stack, adopt gradient to roll technology, electric field is around shielded, by the band electric potential gradient shielding cylinder rolling, allow in capacitor and form one or more layers equipotential region, finally reach the effect of shielding;
2. can greatly reduce the electric capacity of coupling capacitance voltage divider, reduced the pulse current amplitude by voltage divider, thereby reduced the voltage divider Ground Potential Rise Phenomenon that electrical network transient overvoltage causes, can improve the safety and reliability of electronic type voltage transformer (EVT) electrical secondary system;
3. the utility model has significantly reduced the electric field intensity of coupling capacitance voltage divider capacity cell, and this makes coupling capacitance voltage divider inside to substitute conventional condenser oil (mineral oil), SF with environmental protection insulating medium (as nitrogen, carbon dioxide etc.)
6gas etc. have the insulating medium of harm to environment;
4. the utility model can be used as coupling condenser for EVT, to improve the ability of EVT electrical secondary system tolerance transient state process; Also can be used as the support insulator with function of voltage divider, for the monitoring of transformer substation voltage and the measurement of electrical network transient overvoltage, for the primary voltage monitoring of transformer station and line system debugging; Can also be for the higher low-power consumption CVT of insulating property.
Accompanying drawing explanation
Fig. 1 is the coupling capacitance voltage divider schematic diagram of single-stage band electric potential gradient shielding;
Fig. 2 is the coupling capacitance voltage divider schematic diagram of bipolar charging potential gradient shielding;
Fig. 3 is three grades of coupling capacitance voltage divider schematic diagram that shield with electric potential gradient;
Fig. 4 is the band electric potential gradient shielding cylinder schematic diagram of single step arrangement;
Fig. 5 is the band electric potential gradient shielding cylinder schematic diagram that adopts the first single-stage wave structure;
Fig. 6 is the band electric potential gradient shielding cylinder schematic diagram that adopts the second single-stage wave structure;
Fig. 7 is the band electric potential gradient shielding cylinder schematic diagram that adopts the first twin-stage level wave structure;
Fig. 8 is the band electric potential gradient shielding cylinder schematic diagram that adopts the second twin-stage level wave structure;
Fig. 9 is band electric potential gradient shielding cylinder internal capacitance schematic diagram;
Wherein, 1-high-pressure side shading ring, 2-upper flange, 3-sleeve pipe, 4-first order band electric potential gradient shielding cylinder, 5-insulating medium, 6-device body body, 7-low pressure end shading ring, 8-base, 9-terminal box, 10-second level band electric potential gradient shielding cylinder, 11-third level band electric potential gradient shielding cylinder, 12-splicing ear, 13-ring shielding layer, 14-cable paper, 15-abutment ring, 16-interelectrode capacity.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
In order to reduce low capacity coupling capacitance voltage divider, be subject to the degree of factor to intrinsic standoff ratio error effect such as periphery object, electric field change, in low capacity coupling capacitance voltage divider device body body outside, settle the band electric potential gradient shielding cylinder (as Fig. 1-Fig. 3) of one or more coaxial configurations, play and alleviate the interference of external electric field to device body body.Band electric potential gradient shielding cylinder quantity is more, and the larger shielding protection effect of distance is each other better, therefore will be according to the quantity of the shielding cylinder of class of accuracy Location of requirement band electric potential gradient.
The Potential distribution direction of equipotential gradient shielding cylinder is from top to down, and the device body body of installing with middle part is identical, and corresponding capacitive divider element is played to shielding protection effect.
When outside distributed capacitance and periphery electric field exert an influence to capacitive divider, first impact is the shielding cylinder with electric potential gradient, and then affects low capacity coupling capacitance voltage divider device body.The shielding cylinder of coaxial configuration equipotential gradient, plays and alleviates the outside distributed capacitance of buffering and the impact of periphery electric field on low capacity coupling capacitance voltage divider intrinsic standoff ratio.The several coaxial configuration equipotential gradients shieldings of many arrangements, the effect of " shielding " extraneous distributed capacitance and periphery electric field can be better.
Integral capacitor amount and the guarded electrode quantity of the electric potential gradient shielding of coaxial configuration, also have impact to the intrinsic standoff ratio of low capacity coupling capacitance voltage divider device body.Integral capacitor amount is larger, and " shielding " effect is better, but the volume of the electric potential gradient of coaxial configuration shielding can increase.The electric potential gradient guarded electrode number of coaxial configuration is more, and electric potential gradient is finer and close.
Electric pressure is higher, accuracy requirement is higher, and the shielding cylinder of the coaxial configuration band electric potential gradient of employing is more, and the electric capacity value of low capacity coupling capacitance voltage divider device body is higher.
The utility model provides the utility model that a kind of coupling capacitance voltage divider with electric potential gradient shielding is provided, and as Fig. 4-Fig. 9, voltage divider comprises high-pressure side shading ring 1, upper flange 2, device body, base 8 and terminal box 9; Described high-pressure side shading ring 1 is positioned at described device body top, by upper flange 2, is connected with described device body; Described device body bottom is fixed on described base 8, and described terminal box 9 is arranged on described base 8.
Described device body comprises sleeve pipe 3, device body body 6, band electric potential gradient shielding cylinder 4 and low pressure end shading ring 7; Described band electric potential gradient shielding cylinder 4, low pressure end shading ring 7 and sleeve pipe 3 are from inside to outside set in turn in described device body body 6 outsides, and described band electric potential gradient shielding cylinder 4 is parallel with described low pressure end shading ring 7, and arrange perpendicular to described base 8.
Described device body body 6 inside are full of insulating medium 5, and described insulating medium 5 is oiliness insulating medium and gas-insulated medium.
Described sleeve pipe 3 comprises epoxy fibreglass cylinder and cluster parachute; It is inner that described epoxy fibreglass cylinder is positioned at described cluster parachute, the fluid silicone rubber cluster parachute that described cluster parachute is integrated poured moulding; On described cluster parachute, the distance of every two umbrellas between stretching out is between 50～100mm.
The length of described sleeve pipe 3 equates with the described height with electric potential gradient shielding cylinder 4.
Described band electric potential gradient shielding cylinder 4 comprises splicing ear 12, ring shielding layer 13, cable paper 14 and abutment ring 15; Described splicing ear 12 is positioned at described ring shielding layer 13 upper end, described cable paper 14 is wrapped in described ring shielding layer 13 outside, described band electric potential gradient shielding cylinder 4 is connected with upper flange 2 by described splicing ear 12, and is connected with base 8 by described abutment ring 15.
Described band electric potential gradient shielding cylinder is provided with 1～3, is respectively 4,10 and 11, and adjacent is 15～25mm with the spacing between electric potential gradient shielding cylinder 4.
Described device body body 6 comprises electric capacity and metal connecting sheet, connects, and fix with insulating support and binding strap between every two electric capacity by described metal connecting sheet.
Described high-pressure side shading ring 1 and low pressure end shading ring 7 all adopt grading ring.
The material that described upper flange 2 adopts is 0Cr13Al, it is with the alloy preparation that carbon content is 0.075%, silicone content is 0.94%, manganese content is 0.97%, phosphorus content is 0.035%, sulfur content is 0.025%, chromium content is 14.0%, surplus is iron, and described percentage is percent by weight.
The electric pressure of the low capacity coupling capacitance voltage divider of band shielding is 220kV, and its class of accuracy is 0.2 grade.Sleeve pipe 3 adopts silicon rubber composite insulation structure, height 2200mm, internal diameter 355mm.The inner insulating medium 5 choice for use carbon dioxides that adopt of sleeve pipe 3, its nominal operation pressure is 0.5MPa.Device body body 6 adopts traditional the capacitor core coiling of CVT coupling capacitance voltage divider and binder structure, electric capacity 150pF.Capacitor core adopts mylar as layer insulation.The low capacity coupling capacitance voltage divider of band shielding adopts two structures with the shielding cylinder of electric potential gradient, sees Fig. 2.Wherein be with electric potential gradient shielding cylinder 5, adopt the equivalent potential screen cylinder of wave structure, see Fig. 6; With the shielding cylinder of electric potential gradient, adopt the equivalent potential screen cylinder of twin-stage wave structure, see Fig. 8.Low pressure end shading ring 7 height 220mm, external diameter 335mm.
The utility model can greatly reduce the electric capacity of coupling capacitance voltage divider, reduced the pulse current amplitude by voltage divider, thereby reduced the voltage divider Ground Potential Rise Phenomenon that electrical network transient overvoltage causes, can improve the safety and reliability of electronic type voltage transformer (EVT) electrical secondary system.The utility model has significantly reduced the electric field intensity of coupling capacitance voltage divider capacity cell, and this makes coupling capacitance voltage divider inside to substitute conventional condenser oil (mineral oil), SF with environmental protection insulating medium (as nitrogen, carbon dioxide etc.)
6gas etc. have the insulating medium of harm to environment.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although the utility model is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not depart from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (9)
1. with a coupling capacitance voltage divider for electric potential gradient shielding, it is characterized in that: described voltage divider comprises high-pressure side shading ring, upper flange, device body, base and terminal box; Described high-pressure side shading ring is positioned at described device body top, by upper flange, is connected with described device body; Described device body bottom is fixed on described base, and described set of terminal box is on described base.
2. the coupling capacitance voltage divider with electric potential gradient shielding according to claim 1, is characterized in that: described device body comprises sleeve pipe, device body body, band electric potential gradient shielding cylinder and low pressure end shading ring; Described band electric potential gradient shielding cylinder, low pressure end shading ring and sleeve pipe are from inside to outside set in turn in described device body body outside, and described band electric potential gradient shielding cylinder is parallel with described low pressure end shading ring, and perpendicular to described base setting.
3. the coupling capacitance voltage divider with electric potential gradient shielding according to claim 2, is characterized in that: described device body body interior is full of insulating medium, and described insulating medium is oiliness insulating medium and gas-insulated medium.
4. the coupling capacitance voltage divider with electric potential gradient shielding according to claim 2, is characterized in that: described sleeve pipe comprises epoxy fibreglass cylinder and cluster parachute; It is inner that described epoxy fibreglass cylinder is positioned at described cluster parachute, the fluid silicone rubber cluster parachute that described cluster parachute is integrated poured moulding; On described cluster parachute, the distance of every two umbrellas between stretching out is between 50～100mm.
5. according to the coupling capacitance voltage divider with electric potential gradient shielding described in claim 2 or 4, it is characterized in that: the length of described sleeve pipe equates with the described height with electric potential gradient shielding cylinder.
6. the coupling capacitance voltage divider with electric potential gradient shielding according to claim 5, is characterized in that: described band electric potential gradient shielding cylinder comprises splicing ear, ring shielding layer, cable paper and abutment ring; Described splicing ear is positioned at described ring shielding layer upper end, and it is outside that described cable paper is wrapped in described ring shielding layer, and described band electric potential gradient shielding cylinder is connected with upper flange by described splicing ear, and is connected with base by described abutment ring.
7. the coupling capacitance voltage divider with electric potential gradient shielding according to claim 6, is characterized in that: described band electric potential gradient shielding cylinder is provided with 1～3, and adjacent is 15～25mm with the spacing between electric potential gradient shielding cylinder.
8. the coupling capacitance voltage divider with electric potential gradient shielding according to claim 2, it is characterized in that: described device body body comprises electric capacity and metal connecting sheet, between every two electric capacity, by described metal connecting sheet, connect, and fix with insulating support and binding strap.
9. the coupling capacitance voltage divider with electric potential gradient shielding according to claim 1 and 2, is characterized in that: described high-pressure side shading ring and low pressure end shading ring all adopt grading ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320713774.XU CN203561668U (en) | 2013-11-13 | 2013-11-13 | Coupling capacitance voltage divider with potential gradient shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320713774.XU CN203561668U (en) | 2013-11-13 | 2013-11-13 | Coupling capacitance voltage divider with potential gradient shielding |
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| CN203561668U true CN203561668U (en) | 2014-04-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575951A (en) * | 2013-11-13 | 2014-02-12 | 国家电网公司 | Coupling capacitive voltage divider with electric potential gradient shielding |
| CN106872752A (en) * | 2015-12-14 | 2017-06-20 | 全球能源互联网研究院 | A kind of capacitance type potential transformer |
-
2013
- 2013-11-13 CN CN201320713774.XU patent/CN203561668U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575951A (en) * | 2013-11-13 | 2014-02-12 | 国家电网公司 | Coupling capacitive voltage divider with electric potential gradient shielding |
| CN103575951B (en) * | 2013-11-13 | 2016-09-21 | 国家电网公司 | A kind of coupling capacitive divider of band electric potential gradient shielding |
| CN106872752A (en) * | 2015-12-14 | 2017-06-20 | 全球能源互联网研究院 | A kind of capacitance type potential transformer |
| WO2017101530A1 (en) * | 2015-12-14 | 2017-06-22 | 全球能源互联网研究院 | Capacitive voltage transformer |
| CN106872752B (en) * | 2015-12-14 | 2019-08-06 | 全球能源互联网研究院 | A kind of capacitance type potential transformer |
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