CN106872752B - A kind of capacitance type potential transformer - Google Patents
A kind of capacitance type potential transformer Download PDFInfo
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- CN106872752B CN106872752B CN201510922605.0A CN201510922605A CN106872752B CN 106872752 B CN106872752 B CN 106872752B CN 201510922605 A CN201510922605 A CN 201510922605A CN 106872752 B CN106872752 B CN 106872752B
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- 239000003990 capacitor Substances 0.000 claims abstract description 41
- 238000005259 measurement Methods 0.000 claims abstract description 34
- 238000013016 damping Methods 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 7
- 230000005350 ferromagnetic resonance Effects 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 3
- 230000000994 depressogenic effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 38
- 230000000694 effects Effects 0.000 description 8
- 230000005611 electricity Effects 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
A kind of capacitance type potential transformer, including coaxial concatenated capacitive divider and electromagnetic unit, the capacitive divider is in series by top grading shield and concatenated three layers of ganged condenser, the electromagnetic unit includes compensation reactor, intermediate transformer and speed saturation damping reactor, three layers of ganged condenser is successively arranged from inside to outside: main capacitance (1), auxiliary capacitor (5) are used in internal layer shielding, internal layer ring-shaped shield electrode (4), outer shield is with auxiliary capacitor (3), compound inslation sleeve (7) and outer annular bucking electrode (2)；The voltage measurement accuracy of the voltage transformer, response are fast, can satisfy from superelevation and are depressed into the requirement that extra-high voltage level Grid power frequency ac voltage accurately measures；Measurement voltage divider is in good masked state, is not influenced by stray parameter, and intrinsic standoff ratio is stablized, and measurement accuracy is high, can be used as standard mutual inductor use.
Description
Technical field
The present invention relates to electric system transformer devices, and in particular to a kind of capacitive battery of bilayer Equipotential shield shield structure
Press mutual inductor.
Background technique
With the application of 1000kV and the above UHV transmission technology on power transmission engineering, accurate measurement extra-high voltage is proposed
The requirement of network voltage.The existing widely applied power frequency high voltage meter of electric system mainly has electromagnetic potential mutual
Sensor and two kinds of capacitance type potential transformer, the two belongs to passive voltage measuring system, these mutual inductors can substantially expire
The requirement of sufficient 500kV and following voltage class voltage measurement and relay protection.Belong to the photo-electric electricity of active voltage measuring system
Pressure mutual inductor, electronic type voltage transformer are also in during research and development and trial operation at present, are still had such as voltage measurement accuracy, are swashed
The problems such as light device service life, system reliability, need to further be researched and solved, to meet sizable application.
Since insulation is difficult, ultra-high/extra-high voltage grade seldom uses electromagnetic potential transformer.Since structure is simple, can
Lower by property height, cost, capacitance type potential transformer (CVT) is still the master applied in ultra-high/extra-high voltage level Grid voltage measurement
Want equipment.But the design of existing CVT is applied to extra-high voltage grid, encounters following technical difficulty:
1) stray capacitive currents influence accuracy of measurement
Since there are stray capacitance, traditional capacitors between capacitive divider high-voltage arm and the grounding body or electrical body of surrounding
Formula voltage transformer (CVT), under action of high voltage, stray capacitive currents outflow or inflow high-voltage arm cause voltage measurement to miss
Difference.This error is increased with increasing for voltage class.Testing result shows 750kV power grid capacitance type potential transformer reality
Measurement error caused by stray electrical current (including capacitance current and insulation sleeve surface leakage current) may be up to 0.2% or more.Electric field
Emulation shows the CVT of 1000kV, from divider high-voltage arm flow into the earth capacitance current up to 20mA, which results in significant
Measurement error.The measure of increasing divider main capacitance amount is generallyd use to reduce the influence of stray electrical current, even if capacitance increases
Arrive 10000pF greatly, the class of accuracy of the extra-high voltage CVT also difficult standard for reaching 0.1 grade.
2) live effect is difficult
Existing CVT measurement error is thus related with installation site by stray capacitance influences.After in-site installation, ultra-high/extra-high voltage
The CVT of voltage class needs to carry out live effect, is dispatched from the factory with amendment than difference and angular difference.Mutual inductor is carried out in ultra-high voltage transformer station
Live effect it is by no means easy.Other than extra-high voltage reference capacitor manufacture difficulty, the electromagnetic interference at ultra-high voltage transformer station scene
It is also the important restriction factor that the accurate effect in the scene of carrying out compares.
In conclusion the development of UHV transmission is to accuracy of measurement, the improvement response characteristic, release for improving existing CVT
Live effect proposes urgent need.
200710050439.5 a number Chinese patent application discloses a kind of whole shielding capacitor voltage transformer comprising set
In sealing full of in dielectric shell capacitance partial pressure part and calutron, the middle high-pressure electrode of capacitive divider with
Shell three is coaxial configuration, and under voltage effect, the electric field force generated between them is uniformly distributed on circumference and mutually supports
Disappear, the relative position between electrode will not shift, and the capacitor between electrode is extremely stable, improve the precision of mutual inductor.
The patent use full-shield structure, thus have excellent shield effectiveness, but also just because of use full-shield measure,
Cause its volume that can increase rapidly with the raising of measured signal voltage class, is limited, be not suitable in electric power by self structure
Engineering site uses, and the measurement that can not be used for megavolt high pressure uses, and the voltage transformer of this full frame shield structure compares
It is used suitable for High-Voltage Experimentation room alternate standard capacitor.
ZL201010163455.7 Chinese patent application discloses a kind of equal potential shielded capacitor voltage transformer,
Capacitive divider including the double-layer coaxial capacitor assembly with equivalent potential screen and press down with no energy-storage travelling wave tube ferromagnetic resonance
The electromagnetic unit of device and intermediate transformer processed can satisfy from super-pressure up to extra-high voltage level Grid power frequency ac voltage is accurate
The requirement of measurement and the fast and reliable movement of relay protection.Since measurement main capacitance is in good masked state, capacitance can be with
It is greatly lowered, thus, the weight of divider can be greatly lowered, and the shock-resistance features of the divider of thin and tall shape also improve therewith.
It is an object of the invention to by using the double-deck Equipotential shield shield structure, reduce extraneous stray capacitance and divider
Coupling reduces the electric current for flowing out or flowing by stray capacitance from main capacitance, further increases measurement accuracy；Furthermore, it is only necessary to
Want less mask capacitor number and lower capacitance, it will be able to reach measurement essence identical with single layer equivalent potential screen CVT
Degree.
Summary of the invention
The capacitance type potential transformer for the double-deck Equipotential shield shield structure that the present invention designs is based primarily upon equivalent potential screen skill
Art, the principle is as follows:
In measurement voltage divider high-voltage arm main capacitance periphery, a series of annular coaxial bucking electrode, each layer shielding electricity are set
Pole is connected with an auxiliary with shielding divider.It can be proved that if annular electrode uses master along the Potential distribution of axis and measurement
The Potential distribution of capacitor is consistent, then can block the electric current for flowing out or flowing by stray capacitance from main capacitance completely.Ring
The voltage's distribiuting of shape electrode can be adjusted with auxiliary with the parameter selection of shielding divider.Measure divider system and annular
Electrode and auxiliary with shield divider system between there is no any electrical connection.In this way, capacitance current and insulation sleeve table over the ground
The leakage current in face is provided by auxiliary shielding divider, without measuring main capacitance, has been in measurement divider
Kind masked state, to guarantee the high-precision of voltage measurement.
The present invention provides a kind of capacitance type potential transformer of double-deck Equipotential shield shield structure, including capacitive divider and electricity
Magnetic cell, the capacitive divider is from top to bottom by top grading shield three layers of ganged condenser of series connection, and three layers of ganged condenser are again
It is followed in series to form, compensation reactor, intermediate transformer and speed saturation damping reactor is included in the electromagnetic unit.
Further, three layers of ganged condenser is sequentially coaxially equipped with from inside to outside: main capacitance (1), internal layer shielding are used
Auxiliary capacitor (5), internal layer ring-shaped shield electrode (4), outer shield auxiliary capacitor (3), compound inslation sleeve (7), outer layer ring
Shape bucking electrode (2).
Further, the main capacitance (1) is placed on the inner axes of compound inslation sleeve (7), outer annular bucking electrode
(2) and internal layer ring-shaped shield electrode (4) is co-axially located at the upper lower flange outer of main capacitance (1), outer annular bucking electrode (2)
Diameter be greater than internal layer ring-shaped shield electrode (4) diameter.
Further, along compound inslation sleeve (7), inner wall circumference has outer shield auxiliary capacitor (3), described outer
Layer shielding is reliably connected with the positive electrode and negative electrode of auxiliary capacitor (3) with outer annular bucking electrode；In internal layer ring-shaped shield electrode
(4) inside has been arranged symmetrically internal layer shielding auxiliary capacitor (5), the internal layer shielding anode and cathode of auxiliary capacitor (5)
It is reliably connected with internal layer ring-shaped shield electrode,
Further, the main capacitance (1), internal layer shielding use auxiliary capacitor (5) with internal layer ring-shaped shield electrode (4), outside
Layer shielding is used between auxiliary capacitor (3) and outer annular bucking electrode (2) three mutually without any electric link, and insulation is passed through
Material (6) keeps good insulation.
Further, the main circuit of the voltage transformer are as follows: high-voltage arm main capacitance C1Connect low-voltage arm main capacitance C2It is followed by
Ground G is tested high voltage through terminals V and accesses mutual inductor, divides compensation reactor and centre of the resulting measured signal F through concatenating
It is grounded after transformer, the secondary inductive signal access load of intermediate transformer measures, the speed saturation damping in parallel with load
Reactor is ferromagnetic resonance suppressor.
Further, the high-voltage arm main capacitance C1With low-voltage arm main capacitance C2By the main electricity in three layers of ganged condenser axle center
Hold (1) to be composed in series.
Further, measurement divider is in series by the main capacitance (1) of multiple three layers of ganged condensers.
Further, auxiliary with shielding divider by the outer shield of multiple three layers of ganged condensers with auxiliary capacitor (3)
It is in series respectively with auxiliary capacitor (5) with internal layer shielding.
Further, auxiliary is directly grounded with shielding divider, constitutes the double-deck Equipotential shield shield structure of measurement divider；
Measure divider output end by compensation reactor access intermediate transformer armature winding end of incoming cables, intermediate transformer primary around
Group leading-out terminal ground connection；The speed saturation damping reactor in parallel between intermediate transformer secondary windings leading-out terminal and ground；It is intermediate simultaneously
Transformer secondary output winding terminal is through carrying ground.
Compared with the latest prior art, the present invention has following excellent effect:
(1) voltage measurement accuracy of capacitance type potential transformer of the invention, response are fast, can satisfy from superelevation and are depressed into spy
The requirement that high pressure level power grid power frequency ac voltage accurately measures；
(2) measurement voltage divider is in good masked state, is not influenced by stray parameter, and intrinsic standoff ratio is stablized, measurement
Precision is high, can be used as standard mutual inductor use；
(3) when being used as engineering site mutual inductor, without carrying out live effect, mask capacitor and main capacitance magnitude are small, if
Standby overall weight is light, the good mechanical properties such as wind resistance, antidetonation.
Detailed description of the invention
Fig. 1 is the capacitance type potential transformer appearance schematic diagram of the double-deck Equipotential shield shield structure,
Wherein, grading shield at the top of A-, tri- layers of ganged condenser of B-, C- electromagnetic unit；
Fig. 2 is three layers of ganged condenser schematic cross section,
Wherein, 1, measurement main capacitance, 2, outer annular bucking electrode, 3, outer shield auxiliary capacitor, 4, inner layer ring
Shape bucking electrode, 5, internal layer shielding auxiliary capacitor, 6, insulating materials, 7, compound inslation sleeve；
Fig. 3 is three layers of coaxial capacitance device assembly profilograph,
Fig. 4 is novel voltage mutual inductor main circuit diagram according to the present invention.
Specific embodiment
The following further describes the present invention with reference to the drawings.
It is of the invention mainly by the capacitive divider and biography of the coaxial capacitance device assembly with the double-deck Equipotential shield shield structure
The electromagnetic unit of system forms.
As shown in Figure 1, for the capacitance type potential transformer appearance schematic diagram of the double-deck Equipotential shield shield structure, from top to bottom respectively
Component and connection relationship are as follows: part A is top grading shield, and four part Bs of lower series connection, part B is three layers of coaxial capacitance
Device then reconnects C portion electromagnetic unit.
It is illustrated in figure 2 the capacitor assembly diagrammatic cross-section of the double-deck Equipotential shield shield structure, three layers of equivalent potential screen
Coaxial capacitance device assembly is core of the invention component, internal structure: places measurement with master in 7 inner axes of compound inslation sleeve
Coaxial outer annular bucking electrode 2 is arranged in the upper lower flange outer of main capacitance in capacitor 1, along compound inslation sleeve inner wall circle
It is arranged symmetrically several outer shield auxiliary capacitors 3 week, its two poles of the earth are reliably connected with the shielding of upper and lower outer annular, in outer layer
Internal layer ring-shaped shield electrode 4 is set between the electrode of mask capacitor 3 and the electrode of main capacitance 1, along internal layer ring-shaped shield electrode
Side is arranged symmetrically several internal layer shielding auxiliary capacitors 5 again, main capacitance, internal layer mask capacitor and internal layer ring-shaped shield electrode,
It is mutually not allow for any electric link between outer shield capacitor and outer annular bucking electrode three, uses gas insulating material
Or foamed insulation material 6 keeps the good insulation between three.
According to the requirement of voltage class, multiple above-mentioned three layers of ganged condenser component series connection can be selected, form equipotential
The capacitive divider of shielding.
It is illustrated in figure 4 the main electricity of the extra-high-voltage equal potential shielded capacitor voltage transformer according to this invention design
Road, C in figure1For high-voltage arm main capacitance, C2For low-voltage arm main capacitance, Cs is that stray capacitance, V point are to connect tested high voltage over the ground
Terminals, G point are ground connection, and F point is to divide resulting measured signal, and the compensated reactor of the signal and intermediate transformer carry out letter
Access load measures after number conditioning, and speed saturation damping reactor is in parallel with load as ferromagnetic resonance suppressor.
The capacitor of three layers of coaxial capacitance device assembly internal layer is composed in series measurement high-voltage arm main capacitance C1With the main electricity of low-voltage arm
Hold C2, pass through low-voltage arm main capacitance C2Ground connection constitutes measurement divider；Shielding is straight after being connected step by step with auxiliary shielding divider
Ground connection constitutes the equivalent potential screen of measurement divider；The output end of divider accesses intermediate transformer by compensation reactor
Armature winding；Damping reactor is saturated in intermediate transformer secondary parallel speed；Electromagnetic unit outlet is connected to load.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described the invention in detail referring to above-described embodiment, it should be understood by those ordinary skilled in the art that: still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equivalent replacement, should all cover in present claims range.
Claims (8)
1. a kind of capacitance type potential transformer, including coaxial concatenated capacitive divider and electromagnetic unit, which is characterized in that described
Capacitive divider is in series by the concatenated three layers of ganged condenser of top grading shield, and the electromagnetic unit includes compensating reactance
Device, intermediate transformer and speed saturation damping reactor；
What three layers of ganged condenser was arranged from inside to outside: main capacitance (1), internal layer shielding auxiliary capacitor (5), internal layer annular
Bucking electrode (4), outer shield auxiliary capacitor (3), compound inslation sleeve (7) and outer annular bucking electrode (2).
2. voltage transformer as described in claim 1, which is characterized in that the both ends of the main capacitance (1), which are respectively arranged with, puts
Outer annular bucking electrode (2) and internal layer ring-shaped shield electrode (4) flange are set, the diameter of outer annular bucking electrode (2) is greater than
The diameter of internal layer ring-shaped shield electrode (4).
3. voltage transformer as described in claim 1, which is characterized in that the anode of outer shield auxiliary capacitor (3)
It is reliably connected with cathode and outer annular bucking electrode；The internal layer shielding positive and cathode and internal layer of auxiliary capacitor (5)
Ring-shaped shield electrode is reliably connected.
4. voltage transformer as claimed in claim 3, which is characterized in that auxiliary capacitor is used in the main capacitance (1), internal layer shielding
(5) it is set with internal layer ring-shaped shield electrode (4), outer shield between auxiliary capacitor (3) and outer annular bucking electrode (2) three
There are insulating materials (6).
5. voltage transformer as described in claim 1, which is characterized in that the main circuit of the voltage transformer are as follows: low-voltage arm
Main capacitance C2Respectively with high-voltage arm main capacitance C1It is connected with ground, is tested high voltage through terminals V and accesses mutual inductor, divide resulting
Measured signal F is grounded after the compensation reactor and intermediate transformer that concatenate, and the secondary inductive signal access of intermediate transformer is negative
Load measures, and the speed saturation damping reactor in parallel with load is ferromagnetic resonance suppressor.
6. voltage transformer as described in claim 1, which is characterized in that measurement divider is by multiple three layers of ganged condensers
Main capacitance (1) is in series.
7. voltage transformer as described in claim 1, which is characterized in that auxiliary is with shielding divider by multiple three layers of coaxial electricals
The outer shield of container auxiliary capacitor (3) and internal layer shielding are in series respectively with auxiliary capacitor (5).
8. voltage transformer as claimed in claim 7, which is characterized in that auxiliary is directly grounded with shielding divider, is constituted and is surveyed
Measure the double-deck Equipotential shield shield structure of divider；Compensation reactor respectively with measurement divider output end and intermediate transformer at the beginning of
The connection of grade winding end of incoming cables, intermediate transformer armature winding leading-out terminal ground connection；In intermediate transformer secondary windings leading-out terminal through negative
Ground connection is carried, speed saturation damping reactor in parallel is in parallel with load.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510922605.0A CN106872752B (en) | 2015-12-14 | 2015-12-14 | A kind of capacitance type potential transformer |
| PCT/CN2016/098251 WO2017101530A1 (en) | 2015-12-14 | 2016-09-06 | Capacitive voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510922605.0A CN106872752B (en) | 2015-12-14 | 2015-12-14 | A kind of capacitance type potential transformer |
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| Publication Number | Publication Date |
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| CN106872752A CN106872752A (en) | 2017-06-20 |
| CN106872752B true CN106872752B (en) | 2019-08-06 |
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| CN201510922605.0A Active CN106872752B (en) | 2015-12-14 | 2015-12-14 | A kind of capacitance type potential transformer |
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| Country | Link |
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| CN (1) | CN106872752B (en) |
| WO (1) | WO2017101530A1 (en) |
Families Citing this family (11)
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|---|---|---|---|---|
| CN107728096B (en) * | 2017-09-28 | 2024-03-22 | 山东泰开互感器有限公司 | Capacitive voltage transformer test system |
| CN107731488B (en) * | 2017-11-10 | 2024-02-23 | 江苏思源赫兹互感器有限公司 | Multisection voltage transformer convenient to adjust error |
| CN109935460A (en) * | 2017-12-15 | 2019-06-25 | 大连北方互感器集团有限公司 | A kind of capacitance type potential transformer |
| CN108710020B (en) * | 2018-08-16 | 2023-12-08 | 江苏靖江互感器股份有限公司 | Energy-taking and measuring capacitive dual voltage sensor for power distribution equipment |
| CN110850139B (en) * | 2018-08-21 | 2022-02-01 | 西安西电高压开关有限责任公司 | Voltage measuring device |
| CN109254236A (en) * | 2018-11-14 | 2019-01-22 | 国家电网有限公司 | The field test of frequency conversion resonance vibration pressure-proof experimental rig wideband standard voltage divider and its application method |
| CN109254190A (en) * | 2018-11-20 | 2019-01-22 | 江苏思源赫兹互感器有限公司 | A kind of residual voltage sensor based on capacitance partial pressure |
| CN109669090A (en) * | 2019-02-25 | 2019-04-23 | 云南电网有限责任公司红河供电局 | Anti- defect diagnostic method is done in a kind of operation monitored based on carrier general branch electric current and neutral point voltage |
| AT523120B1 (en) * | 2019-11-14 | 2023-10-15 | Greenwood Power Gmbh | Voltage sensor and voltage dividing device |
| CN112180162A (en) * | 2020-09-27 | 2021-01-05 | 江苏思源赫兹互感器有限公司 | Harmonic detection system based on capacitive voltage transformer |
| CN113156359B (en) * | 2021-04-16 | 2024-01-26 | 中国电力科学研究院有限公司 | Method and system for determining metering error of capacitive voltage transformer |
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| CN1508819A (en) * | 2002-12-17 | 2004-06-30 | 王日新 | Dry capacitor type voltage transformer |
| CN101819868A (en) * | 2010-05-04 | 2010-09-01 | 中国电力科学研究院 | Extra-high-voltage equal potential shielded capacitor voltage transformer |
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2015
- 2015-12-14 CN CN201510922605.0A patent/CN106872752B/en active Active
-
2016
- 2016-09-06 WO PCT/CN2016/098251 patent/WO2017101530A1/en active Application Filing
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| CN1508819A (en) * | 2002-12-17 | 2004-06-30 | 王日新 | Dry capacitor type voltage transformer |
| CN101819868A (en) * | 2010-05-04 | 2010-09-01 | 中国电力科学研究院 | Extra-high-voltage equal potential shielded capacitor voltage transformer |
| CN201804696U (en) * | 2010-05-04 | 2011-04-20 | 中国电力科学研究院 | Ultra-high voltage isoelectric shielding CVT |
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| CN203561668U (en) * | 2013-11-13 | 2014-04-23 | 国家电网公司 | Coupling capacitance voltage divider with potential gradient shielding |
| CN204228794U (en) * | 2014-11-14 | 2015-03-25 | 国家电网公司 | A kind of coupling capacitance voltage divider with mask capacitor fuse |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017101530A1 (en) | 2017-06-22 |
| CN106872752A (en) | 2017-06-20 |
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