CN201877276U - Gas-insulating electronic voltage transformer - Google Patents

Gas-insulating electronic voltage transformer Download PDF

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Publication number
CN201877276U
CN201877276U CN 201020606808 CN201020606808U CN201877276U CN 201877276 U CN201877276 U CN 201877276U CN 201020606808 CN201020606808 CN 201020606808 CN 201020606808 U CN201020606808 U CN 201020606808U CN 201877276 U CN201877276 U CN 201877276U
Authority
CN
China
Prior art keywords
voltage divider
gas
copper foil
shielding cylinder
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201020606808
Other languages
Chinese (zh)
Inventor
封晓东
贺要锋
王玉学
刘四军
王来军
易永辉
路光辉
李栋
田志国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XJ Electric Co Ltd
Xuchang XJ Software Technology Co Ltd
Xuchang Power Supply Co of Henan Electric Power Co
Original Assignee
XJ Electric Co Ltd
Xuchang XJ Software Technology Co Ltd
Xuchang Power Supply Co of Henan Electric Power Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XJ Electric Co Ltd, Xuchang XJ Software Technology Co Ltd, Xuchang Power Supply Co of Henan Electric Power Co filed Critical XJ Electric Co Ltd
Priority to CN 201020606808 priority Critical patent/CN201877276U/en
Application granted granted Critical
Publication of CN201877276U publication Critical patent/CN201877276U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02BBOARDS, SUBSTATIONS, OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00Arrangements of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02Arrangements of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035Gas-insulated switchgear
    • H02B13/0356Mounting of monitoring devices, e.g. current transformers

Abstract

The utility model relates to a gas-insulating electronic voltage transformer, which comprises a capacitive voltage divider, a shielding box and a signal acquirer. The capacitive voltage divider is arranged at the head of the gas-insulating electronic voltage transformer, the shielding box is disposed at a base arranged at the bottom of the gas-insulating electronic voltage transformer, a signal outlet end of the capacitive voltage divider is connected with a signal inlet end of the signal acquire by a shielding cable, and the capacitive voltage divider is a coaxial capacitive voltage divider. The gas-insulating electronic voltage transformer adopts the coaxial capacitive voltage divider as a primary and secondary voltage converter and uses SF6 (sulfur hexafluoride 6) gas for main insulation, an extremely thin flexible circuit board is arranged inside the coaxial capacitive voltage divider, a slightly uneven concentric electric field is formed by the flexible circuit board, which is attached to the inner wall of a metal barrel, and a primary conducting rod, the slightly uneven concentric electric field does not affect main wave transmission on the primary conducting rod or distort tested waveforms, the coaxial capacitive voltage divider is positioned at the head of the transformer, so that the structure is compact, and influence of inconsistent temperature is smaller.

Description

A kind of gas-insulated electronic type voltage transformer
Technical field
The utility model belongs to the electric mutual inductor technical field, particularly relates to a kind of gas-insulating type voltage transformer.
Background technology
At present, develop rapidly for adapting to digital transformer substation, the development of electronic mutual inductor and application become suitable exigence.Electronic current mutual inductor and electronic type voltage transformer all have practical application, electronic type voltage transformer mainly contains optical type and all-electronin type, the basic principle of optical type is to utilize the physical effect of functional crystal material, carries out voltage measurement as Pockels effect, inverse piezoelectric effect etc.But because factor affecting certainty of measurement and long-time stability such as linear birefrigence that crystal itself exists, practical application is less, and the electronic type voltage transformer during engineering is used at present mainly is the electron type instrument transformer that the small voltage signal behind the capacitance partial pressure is sampled through signal picker.
The voltage transformer of independently installing for AIS type high pressure, capacitor voltage divider often adopts a plurality of capacitors in series to divide die pressing type, the series capacitance voltage divider is made up of 1 or several coupling capacitor series connection closed assembly, as shown in Figure 1, this series capacitance voltage divider is made up of loam cake 21, expander 22, impregnating agent 23, insulator 24, capacity cell 25, base 26 from top to bottom successively.This capacitance partial pressure structure of the many employings of electronic type voltage transformer at present.
The principle of series capacitance voltage divider as shown in Figure 2.C1, C2 are respectively the high and low pressure arm electric capacity of voltage divider, and Uc1, Uc2 are for being the voltage on the voltage-dividing capacitor.
According to Circuit theory, have
Uc2=k0*Uc1
In the formula: K0=C1/(C1+C2), be voltage ratio.
The series capacitance voltage divider has following deficiency: (1) variations in temperature is to the influence of capacitor voltage divider, capacitor voltage divider places outdoor, when variation of ambient temperature, if capacitor voltage divider temperature has difference up and down the time, the electric capacitance change of high and low pressure arm is inconsistent, thereby can exert an influence to voltage ratio, promptly can have influence on K0, therefore capacitor voltage divider filled with oil often, good with the temperature homogeneity that guarantees the capacitor string, it is minimum to make voltage divider save the difference of temperature up and down, but therefore causes the complicated of structure and insulation; (2) stray capacitance is bigger to the influence of capacitor voltage divider, capacitor voltage divider is combined by some capacitor cell connection in series-parallel, and volume is bigger, under the high voltage service condition, the stray capacitance over the ground of whole voltage divider can reach tens of pico farads to hundreds of pico farads, does not allow to ignore.Simultaneously, also there is stray capacitance in voltage divider to high-pressure side.The existence meeting of stray capacitance affects to the actual voltage ratio K0 of capacitor voltage divider self; (3) the common three-phase paired running of voltage transformer, owing to also there is not certain space stray capacitance between the homophase between the tandem type capacitor voltage divider, exists stronger electric field to influence each other between the capacitor voltage divider of threephase potential transformer and produce amplitude error and phase angle error; (4) series connection voltage-dividing capacitor volume is bigger, and complex structure must be demarcated again through dismounting or after reinstalling, and increases use cost; (5) the series connection voltage-dividing capacitor is difficult to realize the application demand of two second divided voltage devices.
The utility model content
The purpose of this utility model provides a kind of gas-insulated electronic type voltage transformer, and solves the complex structure of existing series connection voltage-dividing capacitor, problems such as volume is big, result of use is undesirable.
For achieving the above object, the utility model adopts following technical scheme: a kind of gas-insulated electronic type voltage transformer comprises shielded box and signal picker that the base position of capacitor voltage divider that its head is provided with, bottom is provided with; The signal output part of described capacitor voltage divider is connected with the signal input part of signal picker by shielded type cable, and described capacitor voltage divider is the coaxial capacitance voltage divider.
Filling the insulating gas of establishing between the Primary Conductor that described coaxial capacitance voltage divider is worn by shielding cylinder and center thereof and shielding cylinder and the Primary Conductor forms; The inwall of described shielding cylinder at least one single-sided flexible circuit board that has been sticked, each flexible PCB is made up of the flexible parent metal that set bottom Copper Foil of inner surface and bottom Copper Foil outside are sticked; The inwall and the flexible parent metal of described shielding cylinder fit tightly; As dielectric first capacitor, the bottom Copper Foil of described shielding cylinder inwall and flexible PCB constitutes with flexible parent metal as dielectric second capacitor the bottom Copper Foil formation of described Primary Conductor and flexible PCB with insulating gas.
Filling the insulating gas of establishing between the Primary Conductor that described coaxial capacitance voltage divider is worn by shielding cylinder and center thereof and shielding cylinder and the Primary Conductor forms; The inwall of described shielding cylinder at least one double-sided flex circuit plate that has been sticked, described each flexible PCB is made up of inner surface set bottom Copper Foil, outer surface set top layer Copper Foil and the middle flexible parent metal that is sticked thereof; The inwall of shielding cylinder and top layer Copper Foil fit tightly and ground connection; As dielectric first capacitor, the top layer Copper Foil of described flexible PCB and bottom Copper Foil constitute with flexible parent metal as dielectric second capacitor the bottom Copper Foil formation of described Primary Conductor and flexible PCB with insulating gas.
From top to bottom be provided with first flange, high-tension insulating bushing and second flange between the head of described voltage transformer and the base successively; Described coaxial capacitance voltage divider is installed on by insulating part on first flange that is connected with high-tension insulating bushing; Described shielded type cable is located in the high-tension insulating bushing.
Gas-insulated electronic type voltage transformer of the present utility model adopts the coaxial capacitance voltage divider as a secondary voltage converter, utilize SF6 gas as main insulation, and the flexible PCB of establishing in the coaxial capacitance voltage divider, Hen is thin, be attached to metallic cylinder inwall and primary conductive bar and form concentrically ringed non-uniform electric field slightly, it does not influence the main ripple transmission on the primary conductive bar, and tested waveform does not distort; The position relative fixed of Primary Conductor and shielding cylinder guarantees that the capacitance of capacitor voltage divider is constant, does not need after system's dismounting to demarcate again; This coaxial capacitance voltage divider simple in structure, volume is little, can two easily cover configurations; Shielding cylinder also plays the electric field shielding effect in the passive while, greatly reduces the electric field influence of adjacent phase; By the structure of suitable adjustment coaxial capacitance voltage divider, can make stray capacitance influences less; The coaxial capacitance voltage divider is positioned at the instrument transformer head, compact conformation, and the inconsistent influence of temperature is less.
Description of drawings
Fig. 1 is a series capacitance voltage divider arrangement schematic diagram;
Fig. 2 is a series capacitance voltage divider schematic diagram;
Fig. 3 is the schematic diagram of a kind of gas-insulated electronic type voltage transformer of the utility model embodiment;
Fig. 4 is a radially schematic diagram of coaxial capacitance voltage divider;
Fig. 5 is the gas-insulated electronic type voltage transformer schematic diagram of a kind of pair of coaxial capacitance voltage divider arrangement;
Fig. 6 is the gas-insulated electronic type voltage transformer schematic diagram of upright structures;
Fig. 7 is the external gas-insulated electronic type voltage transformer schematic diagram of signal picker.
Embodiment
Below in conjunction with specific embodiment the utility model is done further introduction.
Be illustrated in figure 3 as the schematic diagram of a kind of gas-insulated electronic type voltage transformer of the utility model embodiment, as seen from the figure, this instrument transformer comprises the coaxial capacitance voltage divider that is positioned at instrument transformer head 2, the shielded box 14 that is positioned at instrument transformer base 12, the coaxial capacitance voltage divider comprises the Primary Conductor 1 that shielding cylinder 4 and center thereof wear, and the inwall of shielding cylinder 4 is glued with flexible PCB 3; Signal picker 11 is positioned at shielded box 14.
Be provided with first flange 5, high-tension insulating bushing 7 and second flange 13 between the head 2 of instrument transformer and the base 12 successively, the signal output part of coaxial capacitance voltage divider and signal picker 11 inputs adopt special shielded type cable 9, and shielded type cable 9 is loaded in the secondary guide wire 8; Secondary lead wires pipe 8 is positioned at high-tension insulating bushing 7; Be provided with high-tension shielding cover 6 in the high-pressure side of high-tension insulating bushing 7, its low-pressure side is provided with silicon rubber full skirt 10 outward; Also be provided with annexes 17 such as SF6 gas density controller, supervision, inflation on the base.
Be illustrated in figure 4 as radially schematic diagram of the utility model coaxial capacitance voltage divider, as seen from the figure, by Primary Conductor 1, the coaxial capacitance voltage divider that flexible double-sided PCB 3 and shielding cylinder 4 are formed is positioned at the instrument transformer head; Flexible PCB 3 from inside to outside is made up of bottom Copper Foil 31, flexible circuit plate substrate 32, top layer Copper Foil 33 successively.
The coaxial capacitance voltage divider requires Primary Conductor 1 to pass from cylinder center, cylinder inner wall is close to one deck flexible PCB, thereby Primary Conductor 1, flexible PCB 3, shielding cylinder 4 become the capacitor voltage divider of concentric co-axial, constitute by equivalent condenser C1 and C2, the first capacitor high-voltage capacitance C1 is made of the bottom Copper Foil 31 of Primary Conductor and flexible PCB, the outer surface equivalence of Primary Conductor is a pole plate, and the equivalence of the bottom Copper Foil of flexible PCB is another pole plate, and the SF6 insulating gas is as dielectric; The second capacitor low-voltage capacitance C2 is made of flexible PCB and shielding cylinder 4, for the double-sided flex circuit plate, the top layer Copper Foil 33 of flexible PCB and the equivalence of bottom Copper Foil are 2 pole plates, cylinder inner wall links to each other with the top layer Copper Foil and reliable ground, and the base material of flexible PCB such as polyimides are as dielectric; For the single-sided flexible circuit board, cylinder inner wall and the equivalence of bottom Copper Foil are 2 pole plates, and the base material of flexible PCB such as polyimides are as dielectric.Primary Conductor 1 is fixed on the instrument transformer head 2, the two equipotential, and shielding cylinder 4 is fixed on the instrument transformer head 2 through insulating part 15.Instrument transformer head 2 is connected with high-tension insulating bushing 7 by first flange 5, coaxial capacitance voltage divider secondary voltage lead-out wire adopts private mask cable 9, via insulating part 15 with guide wire, first flange 5 and secondary lead wires pipe 8, cause the signal input part that is positioned at secondary shield case 14 signal pickers 11, signal picker 11 provides the connector of fiber-optic signal output, can be connected to combiner by optical fiber stern fast or optical cable.Signal picker based on electronic component is positioned at the secondary low-voltage side and the earthing of casing, easy access and maintenance, and cable is directly powered simultaneously, and reliability greatly improves.
The characteristics of coaxial capacitance voltage divider are: (1) flexible PCB Hen is thin, is attached to the shielding cylinder inwall, forms concentrically ringed non-uniform electric field slightly with Primary Conductor, and it does not influence the main ripple transmission on the Primary Conductor, and tested waveform does not distort; (2) Primary Conductor and shielding cylinder position relative fixed guarantee that the voltage divider capacitance is constant, do not need after system's dismounting to demarcate again; (3) this coaxial capacitance voltage divider arrangement is simple, and volume is little, can dispose by two easily covers; (4) shielding cylinder plays the electric field shielding effect simultaneously, greatly reduces the electric field influence of adjacent phase; (5) by suitably adjusting the structure of coaxial voltage divider, make stray capacitance influences less; (6) the coaxial capacitance voltage divider is positioned at the instrument transformer head, compact conformation, and the inconsistent influence of temperature is less.
As shown in Figure 5, coaxial capacitance voltage divider arrangement of the present utility model is simple, and volume is little, can two easily cover configurations, the i.e. two cover of configuration flexible PCB in shielding cylinder.
As shown in Figure 6, coaxial capacitance voltage divider of the present utility model is positioned at the instrument transformer head, can cooperate inverted installation (coaxial capacitance voltage divider parallel axes is in horizontal plane) with T type instrument transformer head, also can cooperate vertical type (coaxial capacitance voltage divider axis normal is in horizontal plane) to install with bell-jar instrument transformer head, the support and the location of adopting second insulating part 16 to install with one heart in the second way as Primary Conductor.
As shown in Figure 7, signal picker 11 of the present utility model both can be arranged in the shielded box 14, also can leave the voltage transformer body, installed at external cabinet (as convergence control cabinet), thereby can further improve the running environment of electronic loop, improve useful life and reliability.
In addition, signal picker 11 of the present utility model can insert information such as the SF6 density of SF6 gas-monitoring device 17 and pressure, and the capacitance partial pressure ratio of coaxial capacitance voltage divider is revised to improve certainty of measurement; Can insert instrument transformer head temperature information, the voltage ratio by real-time feedback modifiers coaxial capacitance voltage divider further improves precision, and the state of coaxial capacitance voltage divider running environment is monitored in real time; Can export digital quantity or analog quantity, take the ormal station power supply.

Claims (4)

1. gas-insulated electronic type voltage transformer comprises shielded box and signal picker that the base position of capacitor voltage divider that its head is provided with, bottom is provided with; The signal output part of described capacitor voltage divider is connected with the signal input part of signal picker by shielded type cable, it is characterized in that: described capacitor voltage divider is the coaxial capacitance voltage divider.
2. gas-insulated electronic type voltage transformer according to claim 1 is characterized in that: fill the insulating gas of establishing between the Primary Conductor that described coaxial capacitance voltage divider is worn by shielding cylinder and center thereof and shielding cylinder and the Primary Conductor and form; The inwall of described shielding cylinder at least one single-sided flexible circuit board that has been sticked, each flexible PCB is made up of the flexible parent metal that set bottom Copper Foil of inner surface and bottom Copper Foil outside are sticked; The inwall and the flexible parent metal of described shielding cylinder fit tightly; As dielectric first capacitor, the bottom Copper Foil of described shielding cylinder inwall and flexible PCB constitutes with flexible parent metal as dielectric second capacitor the bottom Copper Foil formation of described Primary Conductor and flexible PCB with insulating gas.
3. gas-insulated electronic type voltage transformer according to claim 1 is characterized in that: fill the insulating gas of establishing between the Primary Conductor that described coaxial capacitance voltage divider is worn by shielding cylinder and center thereof and shielding cylinder and the Primary Conductor and form; The inwall of described shielding cylinder at least one double-sided flex circuit plate that has been sticked, described each flexible PCB is made up of inner surface set bottom Copper Foil, outer surface set top layer Copper Foil and the middle flexible parent metal that is sticked thereof; The inwall of shielding cylinder and top layer Copper Foil fit tightly and ground connection; As dielectric first capacitor, the top layer Copper Foil of described flexible PCB and bottom Copper Foil constitute with flexible parent metal as dielectric second capacitor the bottom Copper Foil formation of described Primary Conductor and flexible PCB with insulating gas.
4. according to claim 2 or 3 described gas-insulated electronic type voltage transformers, it is characterized in that: from top to bottom be provided with first flange, high-tension insulating bushing and second flange between the head of described voltage transformer and the base successively; Described coaxial capacitance voltage divider is installed on by insulating part on first flange that is connected with high-tension insulating bushing; Described shielded type cable is located in the high-tension insulating bushing.
CN 201020606808 2010-11-15 2010-11-15 Gas-insulating electronic voltage transformer Expired - Fee Related CN201877276U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201020606808 CN201877276U (en) 2010-11-15 2010-11-15 Gas-insulating electronic voltage transformer

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Application Number Priority Date Filing Date Title
CN 201020606808 CN201877276U (en) 2010-11-15 2010-11-15 Gas-insulating electronic voltage transformer

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354598A (en) * 2011-06-30 2012-02-15 中国西电电气股份有限公司 Capacitive divider with medium voltage positioned at high-voltage side
CN103187158A (en) * 2011-12-30 2013-07-03 陈永山 Electronic type voltage transformer
CN103207300A (en) * 2013-03-21 2013-07-17 许继集团有限公司 Post-type gas insulation electronic voltage transformer
CN103323641A (en) * 2013-05-27 2013-09-25 河南省电力公司鹤壁供电公司 Electronic transformer and implementation method thereof
CN109725193A (en) * 2019-02-25 2019-05-07 云南电网有限责任公司红河供电局 It is a kind of for running the suspension type neutral point undervoltage detection means for doing anti-defect diagonsis

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354598A (en) * 2011-06-30 2012-02-15 中国西电电气股份有限公司 Capacitive divider with medium voltage positioned at high-voltage side
CN102354598B (en) * 2011-06-30 2013-04-10 中国西电电气股份有限公司 Capacitive divider with medium voltage positioned at high-voltage side
CN103187158A (en) * 2011-12-30 2013-07-03 陈永山 Electronic type voltage transformer
CN103187158B (en) * 2011-12-30 2016-12-21 陈永山 A kind of electronic type voltage transformer
CN103207300A (en) * 2013-03-21 2013-07-17 许继集团有限公司 Post-type gas insulation electronic voltage transformer
CN103207300B (en) * 2013-03-21 2016-08-03 许继集团有限公司 A kind of column support type gas-insulating electronic voltage transformer
CN103323641A (en) * 2013-05-27 2013-09-25 河南省电力公司鹤壁供电公司 Electronic transformer and implementation method thereof
CN103323641B (en) * 2013-05-27 2015-12-02 国家电网公司 The implementation method of electronic mutual inductor and electronic mutual inductor
CN109725193A (en) * 2019-02-25 2019-05-07 云南电网有限责任公司红河供电局 It is a kind of for running the suspension type neutral point undervoltage detection means for doing anti-defect diagonsis

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110622

Termination date: 20191115