CN106872752A - A kind of capacitance type potential transformer - Google Patents

A kind of capacitance type potential transformer Download PDF

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Publication number
CN106872752A
CN106872752A CN201510922605.0A CN201510922605A CN106872752A CN 106872752 A CN106872752 A CN 106872752A CN 201510922605 A CN201510922605 A CN 201510922605A CN 106872752 A CN106872752 A CN 106872752A
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CN
China
Prior art keywords
transformer
voltage
internal layer
shield
divider
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CN201510922605.0A
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Chinese (zh)
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CN106872752B (en
Inventor
郑健超
高冲
董巍
谢剑
张娟娟
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
China EPRI Electric Power Engineering Co Ltd
Original Assignee
State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
China EPRI Electric Power Engineering Co Ltd
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Application filed by State Grid Corp of China SGCC, Global Energy Interconnection Research Institute, China EPRI Electric Power Engineering Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201510922605.0A priority Critical patent/CN106872752B/en
Priority to PCT/CN2016/098251 priority patent/WO2017101530A1/en
Publication of CN106872752A publication Critical patent/CN106872752A/en
Application granted granted Critical
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
    • 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, capacitive divider and electromagnetic unit including coaxial series connection, the capacitive divider is in series with the three layers of ganged condenser connected by top grading shield, the electromagnetic unit includes compensation reactor, intermediate transformer and fast saturation damping reactor, and three layers of ganged condenser is sequentially provided with from inside to outside：Main capacitance (1), internal layer shielding auxiliary capacitor (5), internal layer ring-shaped shield electrode (4), outer shield 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 meet from superelevation and be depressed into the requirement that extra-high voltage level Grid power frequency ac voltage is accurately measured；Measurement voltage divider is in good masked state, is not influenceed by stray parameter, and intrinsic standoff ratio stabilization, certainty of measurement is high, can be used as standard mutual inductor.

Description

A kind of capacitance type potential transformer
Technical field
The present invention relates to power system transformer device, and in particular to a kind of electric capacity of double-deck Equipotential shield shield structure Formula voltage transformer.
Background technology
With the application of 1000kV and above UHV transmission technology on power transmission engineering, it is proposed that accurate measurement The requirement of extra-high voltage grid voltage.The existing wide variety of power frequency high voltage meter of power system is main There are two kinds of electromagnetic potential transformer and capacitance type potential transformer, both belong to passive voltage measuring system, These transformers substantially disclosure satisfy that the requirement of 500kV and following voltage class voltage measurement and relay protection. Optical Potential Transformer, the electronic type voltage transformer for belonging to active voltage measuring system are also in research and development at present Need to enter during trial operation, the problems such as still have such as voltage measurement accuracy, laser life-span, system reliability One step is researched and solved, to meet sizable application.
Because insulation is difficult, ultra-high/extra-high voltage grade seldom uses electromagnetic potential transformer.Due to structure letter Single, reliability is high, cost is relatively low, and capacitance type potential transformer (CVT) is still ultra-high/extra-high voltage level Grid The capital equipment applied in voltage measurement.But, the design of existing CVT is applied to extra-high voltage grid, runs into Following technical difficulty：
1) stray capacitive currents influence accuracy of measurement
It is traditional due to there is stray capacitance between capacitive divider high-voltage arm and the grounding body or electrical body of surrounding Capacitance type potential transformer (CVT), under action of high voltage, stray capacitive currents flow out or flow into high-voltage arm, Cause voltage measurement error.This error is increased with increasing for voltage class.Testing result shows 750kV The real stray electrical current (including capacitance current and insulation sleeve surface leakage current) of power network capacitance type potential transformer draws The measurement error for rising may be up to more than 0.2%.Electric Field Simulation shows, the CVT of 1000kV, from divider high pressure Arm flows into the capacitance current of the earth up to 20mA, which results in significant measurement error.Generally using increasing point The measure of depressor main capacitance amount reduces the influence of stray electrical current, even if capacitance increases to 10000pF, special The class of accuracy of the high pressure CVT also difficult standard for reaching 0.1 grade.
2) live effect is difficult
Existing CVT measurement errors by stray capacitance influences thus it is relevant with installation site.After in-site installation, surpass/ The CVT of extra-high voltage grade is dispatched from the factory than difference and angular difference with correcting, it is necessary to carry out live effect.Extra-high The live effect that buckling power station carries out transformer is by no means easy.In addition to extra-high voltage reference capacitor manufacture difficulty, The electromagnetic interference at ultra-high voltage transformer station scene is also to carry out the important restriction factor that live accurate effect is compared.
In sum, the development of UHV transmission is to improving the accuracy of measurement of existing CVT, improving response spy Property, exempt live effect and propose active demand.
No. 200710050439.5 Chinese patent applications disclose a kind of whole shielding capacitor voltage transformer, its bag Include be placed in sealing full of the capacitance partial pressure part in dielectric housing and calutron, capacitive divider Middle high-pressure electrode is coaxial configuration with housing three, and under voltage effect, the electric field force produced between them is equal Even to be distributed on circumference and cancel out each other, the relative position between electrode will not shift, the electricity between electrode Hold and extremely stablize, improve the precision of transformer.The patent employs the structure of full-shield, thus with excellent Shield effectiveness, but also just because of full-shield measure is employed, cause its volume can be with measured signal voltage etc. Level rising and increase rapidly, limited by self structure, be not suitable in power engineering onsite application, can not Measurement for megavolt high pressure is used, and the voltage transformer ratio of this full frame shield structure is more suitable for high pressure Laboratory alternate standard capacitor is used.
ZL201010163455.7 Chinese patent applications disclose a kind of equal potential shielded capacitor voltage mutual inductance Device, its capacitive divider for including the double-layer coaxial capacitor assembly with equivalent potential screen and with without energy storage unit Part ferromagnetic resonance suppressor and the electromagnetic unit of intermediate transformer, can meet from super-pressure up to extra-high voltage grade Power network power frequency ac voltage accurately measures the requirement with the fast and reliable action of relay protection.At measurement main capacitance In good masked state, capacitance can be greatly lowered, thus, the weight of divider can be greatly lowered, The shock-resistance features of the divider of thin and tall shape also improve therewith.
It is an object of the invention to pass through, using double-deck Equipotential shield shield structure, to reduce extraneous stray capacitance and partial pressure The coupling of device, reduces the electric current for being flowed out or being flowed into by stray capacitance from main capacitance, certainty of measurement is further carried It is high；In addition, it is only necessary to less mask capacitor number and lower capacitance, it becomes possible to reach and the electricity such as individual layer Bit mask CVT identical certainties of measurement.
The content of the invention
The capacitance type potential transformer of the double-deck Equipotential shield shield structure of present invention design is based primarily upon Equipotential shield Technology is covered, its principle is as follows：
In measurement voltage divider high-voltage arm main capacitance periphery, a series of annular coaxial bucking electrode, each layer screen are set Electrode is covered to be connected with an auxiliary shielding divider.May certify that, if annular electrode is along the current potential point of axis Cloth is consistent with the Potential distribution of measurement main capacitance, then can completely block from main capacitance and pass through stray capacitance Outflow or the electric current for flowing into.The parameter that the voltage's distribiuting of annular electrode can shield divider with auxiliary selects to add To adjust.There is no any electric between measurement divider system and annular electrode and auxiliary shielding divider system Connection.So, over the ground capacitance current and the leakage current on insulation sleeve surface is carried by auxiliary shielding divider For without measuring main capacitance, making measurement divider be in perfect masked state, so as to ensure voltage The high accuracy of measurement.
The present invention provides a kind of capacitance type potential transformer of double-deck Equipotential shield shield structure, including capacitive divider And electromagnetic unit, the capacitive divider is from top to bottom by top grading shield three layers of ganged condenser of series connection, three layers Ganged condenser is followed in series to form again, in the electromagnetic unit comprising compensation reactor, intermediate transformer and Fast saturation damping reactor.
Further, three layers of ganged condenser is sequentially coaxially provided with from inside to outside：Main capacitance (1), internal layer It is shielding auxiliary capacitor (5), internal layer ring-shaped shield electrode (4), outer shield auxiliary capacitor (3), compound Insulating sleeve (7), outer annular 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) are co-axially located at outside the upper lower flange of main capacitance (1) Edge, the diameter with diameter greater than internal layer ring-shaped shield electrode (4) of outer annular bucking electrode (2).
Further, there is outer shield auxiliary capacitor (3) along compound inslation sleeve (7) inwall circumference, The positive pole of the outer shield auxiliary capacitor (3) is reliably connected with negative pole with outer annular bucking electrode；Including Layer ring-shaped shield electrode (4) inner side has been arranged symmetrically internal layer shielding auxiliary capacitor (5), and the internal layer shielding is used Positive pole and negative pole and the internal layer ring-shaped shield electrode of auxiliary capacitor (5) are reliably connected,
Further, the main capacitance (1), internal layer shielding with auxiliary capacitor (5) with internal layer ring-shaped shield electrode (4), Outer shield is not any electric with mutually between auxiliary capacitor (3) and outer annular bucking electrode (2) three Knot, good insulation is kept by insulating materials (6).
Further, the main circuit of the voltage transformer is：High-voltage arm main capacitance C1The connection main electricity of low-voltage arm Hold C2After be grounded G, be tested high voltage through terminals V access transformer, obtained by partial pressure measured signal F warp Be grounded after the compensation reactor and intermediate transformer of concatenation, the secondary induced signal of intermediate transformer access load into Row measurement, the fast saturation damping reactor in parallel with load is ferromagnetic resonance suppressor.
Further, the high-voltage arm main capacitance C1With low-voltage arm main capacitance C2By three layers of ganged condenser axle center Main capacitance (1) be composed in series.
Further, measurement divider is in series by multiple three layers of main capacitances of ganged condenser (1).
Further, auxiliary shielding divider is by multiple three layers of outer shield auxiliary capacitors of ganged condenser (3) shield and use auxiliary capacitor (5) in series respectively with internal layer.
Further, auxiliary shielding divider is directly grounded, and constitutes the double-deck equivalent potential screen of measurement divider Structure；The output end for measuring divider accesses intermediate transformer armature winding end of incoming cables by compensation reactor, in Between transformer armature winding leading-out terminal ground connection；Speed in parallel is full between intermediate transformer secondary windings leading-out terminal and ground And damping reactor；Intermediate transformer secondary windings leading-out terminal is through carrying ground simultaneously.
With immediate prior art ratio, the present invention is with following excellent effect：
(1) voltage measurement accuracy of capacitance type potential transformer of the invention, response are fast, can meet from super The requirement that high pressure is accurately measured to extra-high voltage level Grid power frequency ac voltage；
(2) measurement voltage divider is in good masked state, is not influenceed by stray parameter, and intrinsic standoff ratio is steady Fixed, certainty of measurement is high, can be used as standard mutual inductor；
(3) when as engineering site transformer, without carrying out live effect, mask capacitor and main capacitance amount Value is small, and equipment overall weight is light, the good mechanical property such as wind resistance, antidetonation.
Brief description of the drawings
Fig. 1 is the capacitance type potential transformer appearance schematic diagram of double-deck Equipotential shield shield structure,
Wherein, A- tops grading shield, tri- layers of ganged condensers of B-, C- electromagnetic units；
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, 4th, internal layer ring-shaped shield electrode, 5, internal layer shielding auxiliary capacitor, 6, insulating materials, 7, compound insulation sleeve Cylinder；
Fig. 3 is three layers of coaxial capacitance device assembly profilograph,
Fig. 4 is according to novel voltage mutual inductor main circuit diagram of the invention.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
The main capacitive divider by the coaxial capacitance device assembly with double-deck Equipotential shield shield structure of the invention Constituted with traditional electromagnetic unit.
As shown in figure 1, be the capacitance type potential transformer appearance schematic diagram of double-deck Equipotential shield shield structure, from upper And lower each part and annexation are：Part A is top grading shield, and four part Bs, B are connected in series under it Part is three layers of ganged condenser, then reconnects C portion electromagnetic unit.
The capacitor assembly generalized section of double-deck Equipotential shield shield structure is illustrated in figure 2, equivalent potential screen Three layers of coaxial capacitance device assembly are core component of the invention, its internal structure：In the interior axle of compound inslation sleeve 7 The heart places measurement main capacitance 1, and coaxial outer annular bucking electrode is set in the upper lower flange outer of main capacitance 2, it is arranged symmetrically several outer shield auxiliary capacitors 3, its two poles of the earth along compound inslation sleeve inwall circumference It is reliably connected with the shielding of upper and lower outer annular, between the electrode of outer layer mask capacitor 3 and the electrode of main capacitance 1 Internal layer ring-shaped shield electrode 4 is set, and being arranged symmetrically several internal layers again along internal layer ring-shaped shield electrode inner side shields With auxiliary capacitor 5, main capacitance, internal layer mask capacitor and internal layer ring-shaped shield electrode, outer shield electric capacity with it is outer Any electric link is mutually not allow between layer ring-shaped shield electrode three, it is exhausted with gas insulating material or foam Edge 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, composition etc. are can select The capacitive divider of potential screen.
It is illustrated in figure 4 according to the extra-high-voltage equal potential shielded capacitor voltage transformer of this invention design Main circuit, C in figure1It is high-voltage arm main capacitance, C2It is low-voltage arm main capacitance, Cs is stray capacitance, V over the ground To connect tested high-tension terminals, G points are ground connection to point, and F points are the measured signal obtained by partial pressure, the signal Access load is measured after compensated reactor and intermediate transformer carry out signal condition, and fast saturation damps reactance Device 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 C1And low-voltage arm Main capacitance C2, by low-voltage arm main capacitance C2Ground connection, constitutes measurement divider；Shielding auxiliary shielding point Depressor is directly grounded after connecting step by step, constitutes the equivalent potential screen of measurement divider；The output end of divider passes through Compensation reactor accesses intermediate transformer armature winding；In the speed saturation damping reactance of intermediate transformer secondary parallel Device；Electromagnetic unit outlet is connected to load.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention rather than it is limited System, although being described in detail to the present invention with reference to above-described embodiment, those of ordinary skill in the art should Work as understanding：Specific embodiment of the invention can still be modified or equivalent, and without departing from this Any modification of spirit and scope or equivalent, it all should cover in the middle of present claims scope.

Claims (9)

1. the capacitive divider and electromagnetic unit of a kind of capacitance type potential transformer, including coaxial series connection, its feature It is that the capacitive divider is in series with the three layers of ganged condenser connected by top grading shield, the electricity Magnetic cell includes compensation reactor, intermediate transformer and fast saturation damping reactor.
2. voltage transformer as claimed in claim 1, it is characterised in that three layers of ganged condenser by It is interior to outer setting：Main capacitance (1), internal layer shielding with auxiliary capacitor (5), internal layer ring-shaped shield electrode (4), Outer shield auxiliary capacitor (3), compound inslation sleeve (7) and outer annular bucking electrode (2).
3. voltage transformer as claimed in claim 2, it is characterised in that the two ends of the main capacitance (1) It is respectively arranged with placement outer annular bucking electrode (2) and internal layer ring-shaped shield electrode (4) flange, outer layer ring The diameter with diameter greater than internal layer ring-shaped shield electrode (4) of shape bucking electrode (2).
4. voltage transformer as claimed in claim 2, it is characterised in that outer shield auxiliary electricity The positive pole and negative pole for holding (3) are reliably connected with outer annular bucking electrode；The internal layer shielding auxiliary capacitor (5) Positive pole and negative pole be reliably connected with internal layer ring-shaped shield electrode.
5. voltage transformer as claimed in claim 4, it is characterised in that the main capacitance (1), internal layer screen Cover with auxiliary capacitor (5) and internal layer ring-shaped shield electrode (4), outer shield auxiliary capacitor (3) and outer annular screen Cover and be provided with insulating materials (6) between electrode (2) three.
6. voltage transformer as claimed in claim 1, it is characterised in that the main circuit of the voltage transformer For：Low-voltage arm main capacitance C2Respectively with high-voltage arm main capacitance C1With ground connection, high voltage is tested through terminals V Transformer is accessed, the measured signal F obtained by partial pressure is grounded after the compensation reactor and intermediate transformer through concatenating, The secondary induced signal of intermediate transformer accesses load and measures, the fast saturation damping reactor in parallel with load It is ferromagnetic resonance suppressor.
7. voltage transformer as claimed in claim 2, it is characterised in that measurement divider is by multiple three layers The main capacitance (1) of ganged condenser is in series.
8. voltage transformer as claimed in claim 2, it is characterised in that auxiliary shielding divider is by more The outer shield auxiliary capacitor (3) of individual three layers of ganged condenser and internal layer shielding auxiliary capacitor (5) are connected respectively Constitute.
9. voltage transformer as claimed in claim 8, it is characterised in that auxiliary shielding divider directly connects Ground, constitutes the double-deck Equipotential shield shield structure of measurement divider；Compensation reactor is defeated with measurement divider respectively Go out end and the connection of intermediate transformer armature winding end of incoming cables, intermediate transformer armature winding leading-out terminal ground connection；In Between transformer secondary windings leading-out terminal through carrying ground, speed saturation damping reactor in parallel is in parallel with load.
CN201510922605.0A 2015-12-14 2015-12-14 A kind of capacitance type potential transformer Active CN106872752B (en)

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PCT/CN2016/098251 WO2017101530A1 (en) 2015-12-14 2016-09-06 Capacitive voltage transformer

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* Cited by examiner, † Cited by third party
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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
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
CN112997086A (en) * 2018-11-16 2021-06-18 Abb瑞士股份有限公司 Voltage sensor and device
CN114761813A (en) * 2019-11-14 2022-07-15 格林伍德电力有限责任公司 Voltage sensor and voltage divider

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Publication number Priority date Publication date Assignee Title
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
CN112997086A (en) * 2018-11-16 2021-06-18 Abb瑞士股份有限公司 Voltage sensor and device
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
CN114761813A (en) * 2019-11-14 2022-07-15 格林伍德电力有限责任公司 Voltage sensor and voltage divider
CN114761813B (en) * 2019-11-14 2023-08-15 格林伍德电力有限责任公司 Voltage sensor and voltage divider

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