CN107271745A - A kind of broadband divider based on capacitance-resistance and series connection - Google Patents
A kind of broadband divider based on capacitance-resistance and series connection Download PDFInfo
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- CN107271745A CN107271745A CN201710685261.5A CN201710685261A CN107271745A CN 107271745 A CN107271745 A CN 107271745A CN 201710685261 A CN201710685261 A CN 201710685261A CN 107271745 A CN107271745 A CN 107271745A
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- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims description 66
- 229910052751 metal Inorganic materials 0.000 claims description 66
- 238000009413 insulation Methods 0.000 claims description 43
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 4
- 206010008469 Chest discomfort Diseases 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000004044 response Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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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
- G01R15/04—Voltage dividers
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a kind of broadband divider based on capacitance-resistance and series connection, including high-voltage arm and low-voltage arm；High-voltage arm is electrically connected with low-voltage arm；Low-voltage arm includes second partial pressure unit, and the second partial pressure unit includes tunable capacitor and second resistance, and tunable capacitor and second resistance are connected in parallel；Wherein, tunable capacitor is used to adjust its capacitance so that the product of its capacitance and second resistance resistance is equal with the product of the resistance of high-voltage arm and capacitance.The present invention solves the discreteness due to process conditions and component parameters, completes that the deviation between design load occurs after assembling, this deviation can not be corrected, and result in frequency response range can not still reach the technical problem of preferable design effect.
Description
Technical field
The present invention relates to power measurement field, more particularly to a kind of broadband divider based on capacitance-resistance parallel-serial.
Background technology
In general, high voltage is pressed certain ratio by divider using electromagnetic coupled principle or electric capacity series connection voltage divider principle
Example is converted to small voltage, exports to measurement, metering or protection device.
In recent years, with new energy power generation grid-connections such as solar energy, wind energies, and load end power mode variation, make
Direct current in power network and harmonic components increase, had a strong impact on conventional electromagnetic and the divider of capacitance-voltage-distributing type principle
Measurement accuracy.
In order to meet actual measurement request, divider should be able to accurately measure DC component and 0-3kHz harmonic component.But
Existing electromagnetic type divider is using silicon steel sheet as iron core, and its frequency response is limited in 10-400Hz；Traditional capacitive divider
Formula divider can introduce high pressure transient process due to retaining residual charge in electrode.Therefore, the divider of both common principles
Direct current and harmonic component measurement request can not be met.
The divider of divider principle based on capacitance-resistance parallel-serial, is theoretically obtainable broadband response, but in manufacture
During, due to process conditions and the discreteness of component parameters, complete that the deviation between design load occurs after assembling, this
One deviation can not be corrected, and result in frequency response range can not still reach the technical problem of preferable design effect.
The content of the invention
The invention provides a kind of broadband divider based on capacitance-resistance parallel-serial, solve due to process conditions and member
The discreteness of part parameter, completes that the deviation between design load occurs after assembling, this deviation can not be corrected, result in frequency
Rate response range can not still reach the technical problem of preferable design effect.
The invention provides a kind of broadband divider based on capacitance-resistance parallel-serial, including high-voltage arm and low-voltage arm；
The high-voltage arm is electrically connected with the low-voltage arm；
The low-voltage arm includes second partial pressure unit, and second partial pressure unit includes tunable capacitor and the second electricity
Resistance, the tunable capacitor and the second resistance are connected in parallel；
Wherein, the tunable capacitor be used for adjust its capacitance so that the product of its capacitance and second resistance resistance with
The resistance of the high-voltage arm and the product of capacitance are equal.
Preferably, the tunable capacitor includes metal polar plate, second time metal polar plate and distance adjusting mechanism on second；
Metal polar plate is parallel with second time metal polar plate on described second and is separated by preset distance setting；
The distance adjusting mechanism is used to adjust the preset distance.
Preferably, the distance adjusting mechanism includes：Insulated screw and insulation handwheel；
Metal polar plate and second time metal polar plate are circular pole plate on described second；
The insulated screw is vertical through metal polar plate, second time metal polar plate and the insulation on described second
Handwheel；
The insulation handwheel is provided with first through hole, and the insulation handwheel passes through the first through hole and the insulated screw
Threaded connection；
Metallic plate on the insulated screw and second.
Preferably, the two ends of the second resistance respectively with metal polar plate on described second and second time metal polar plate
Electrical connection.
Preferably, the high-voltage arm includes at least two first metal polar plates, and adjacent the first metal polar plate described two-by-two leads to
Insulating supporting intercolumniation is crossed every the second preset distance, and adjacent the first metal polar plate described two-by-two is parallel with first resistor.
Preferably, the outer of first metal polar plate is fixedly installed grading ring.
Preferably, a kind of broadband divider based on capacitance-resistance parallel-serial that the present invention is provided also includes Insulating A High-Voltage chamber
With insulation low pressure chamber；
The Insulating A High-Voltage chamber is fixedly connected with the insulation low pressure chamber by the insulating supporting post；
The high-voltage arm is arranged at the Insulating A High-Voltage intracavitary；
The low-voltage arm is arranged in the insulation low pressure chamber；
The bottom of the Insulating A High-Voltage chamber is provided with seal socket, and the high-voltage arm extraction wire passes through the seal socket
It is electrically connected with the low-voltage arm.
Preferably, it is full of insulating gas in the high pressure chest and the low pressure chamber.
Preferably, a kind of broadband divider based on capacitance-resistance parallel-serial that the present invention is provided also includes insulation umbrella cover, institute
State Insulating A High-Voltage chamber and the insulation low pressure chamber is arranged in the insulation umbrella cover.
Preferably, a kind of broadband divider based on capacitance-resistance parallel-serial that the present invention is provided also includes base, the bottom
Seat is fixedly connected with the bottom of the insulating sleeve；
The insulated screw is run through behind the top of the base vertically by air seal set, is passed through in the inside of the base
The first through hole is threadedly coupled with the insulation handwheel.
From above technical scheme, the present invention has advantages below：
The invention provides a kind of broadband divider based on capacitance-resistance parallel-serial, including high-voltage arm and low-voltage arm；It is described
High-voltage arm is electrically connected with the low-voltage arm；The low-voltage arm includes second partial pressure unit, the second partial pressure unit bag
Tunable capacitor and second resistance are included, the tunable capacitor and the second resistance are connected in parallel；Wherein, the tunable capacitor is used for
Adjust its capacitance so that the resistance and capacitance of the product of its capacitance and second resistance resistance and the high-voltage arm
Product is equal.
The present invention is by adjusting the tunable capacitor of low-voltage arm or changing the second resistance of low-voltage arm so that high-voltage arm and low
The relation of the capacitance resistance of pressure arm, meets the resistance of high-voltage arm and product and the tunable capacitor of capacitance and second resistance
Product is equal, you can causes divider to accomplish that broadband is corresponding after the completion of assembling, have modified deviation, solve due to technique bar
The discreteness of part and component parameters, completes that the deviation between design load occurs after assembling, this deviation can not be corrected, led
Frequency response range has been caused still to reach the technical problem of preferable design effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of the broadband divider based on capacitance-resistance parallel-serial provided in an embodiment of the present invention；
Fig. 2 is capacitance-resistance parallel-serial divider schematic diagram；
Fig. 3 is the front view of the first partial pressure unit in Fig. 1；
Fig. 4 is the upward view of the first partial pressure unit in Fig. 1；
Fig. 5 is the equivalent circuit diagram of the first partial pressure unit in Fig. 1；
Fig. 6 is the structural representation of the second partial pressure unit in Fig. 1；
Wherein, marked in figure as follows：
1st, high-voltage arm；2nd, low-voltage arm；3rd, metal polar plate on second；4th, second time metal polar plate；5th, insulated screw；6th, insulate
Handwheel；7th, the first metal polar plate；8th, insulating supporting post；9th, first resistor；10th, grading ring；11st, insulate umbrella cover；12nd, base；R1、
The resistance of high-voltage arm；C1, high-voltage arm capacitance；C2, tunable capacitor；R2, second resistance.
Embodiment
Fig. 1 to Fig. 6 is referred to, the invention provides an a kind of reality of the broadband divider based on capacitance-resistance parallel-serial
Apply example.
The embodiments of the invention provide a kind of broadband divider based on capacitance-resistance parallel-serial, including high-voltage arm 1 and low pressure
Arm 2；
High-voltage arm 1 is electrically connected with the low-voltage arm 2；
Low-voltage arm 2 includes second partial pressure unit, and the second partial pressure unit includes tunable capacitor C2With second resistance R2, can
Adjust electric capacity C2With second resistance R2It is connected in parallel；
Wherein, tunable capacitor C2For adjusting its capacitance so that its capacitance and second resistance R2The product of resistance and height
The resistance R of pressure arm 11With capacitance C1Product it is equal.
Broadband divider provided in an embodiment of the present invention based on capacitance-resistance parallel-serial is to be based on capacitance-resistance parallel-serial partial pressure
The principle of device, intrinsic standoff ratio K can be obtained by formula (1)：
In formula (1)：K is intrinsic standoff ratio；U1、U2Difference primary voltage and secondary voltage；R1、C1And R2、C2Respectively high and low pressure
The all-in resistance of arm and total capacitance in parallel；ω is the frequency of voltage source.
It can be seen that by formula (1)：The no-load voltage ratio K of divider, depends not only on resistance value, capacitance (R1、R2、C1、C2), and
And be also the function of frequencies omega, that is to say, that it is nonlinear to frequency, is a complex variable.This does not meet linear sensing will
Ask, in order to obtain fixed no-load voltage ratio, control resistance, the configuration of appearance parameter, make to meet formula (2) condition in the design：
R1C1=R2C2 (2)
Formula (2) is substituted into formula (1), no-load voltage ratio relation is reduced to formula (3)：
Formula (3) shows that divider is purely resistive, and intrinsic standoff ratio K is only dependent upon R1、R2Configuration, it is no longer related to frequency, it is reason
The broadband divider based on capacitance-resistance parallel-serial thought.This is present invention ensure that voltage transformer has wideband response characteristic
Theoretical foundation.
Formula (2) is the condition that formula (3) is set up, and is also to ensure that the key technology condition of divider broadband properties, but due to
In practical operation, the otherness of component parameters and assembly technology is inevitable, can cause actual value will not with calculated value
Strict Compliance, i.e. formula (2) are untenable.Solution of the present invention is as follows：
It can be tried to achieve by formula (2)：
C2=(R1/R2)C1 (4)
Formula (4) shows, as long as fine setting C2Or change R2, so that it may formula (4) establishment, formula (2) formula (3) is also reverted to automatically
It is vertical.
The embodiment of the present invention is by C2It is designed to a kind of trimmable structure, or by R2Conveniently replaced structure is designed as, with
Ensure that divider parameter after assembling is completed remains to be corrected, to keep broadband response characteristic.
Further, the tunable capacitor C2Including metal polar plate 3, second time metal polar plate 4 on second and apart from adjustment
Mechanism；
Metal polar plate 3 is parallel with second time metal polar plate 4 on second and is separated by preset distance setting；
Distance adjusting mechanism is used to adjust preset distance.
In the embodiment of the present invention, in order to by C2Capacitance it is adjustable, then under the metal polar plate 3 and second on second
One distance adjusting mechanism is set in the structure that metal polar plate 4 is constituted, passes through metal polar plate 3 in distance adjusting mechanism adjustment second
C is adjusted with the distance between second time metal polar plate 42Capacitance.
Further, distance adjusting mechanism includes：Insulated screw 5 and insulation handwheel 6；
Metal polar plate 3 and second time metal polar plate 4 are circular pole plate on second；
Insulated screw 5 is vertical through metal polar plate on second 3, second time metal polar plate 4 and insulation handwheel 6；
Insulation handwheel 6 is provided with first through hole, and insulation handwheel 6 is threadedly coupled by first through hole with insulated screw 5；
Second time metal polar plate 4 is provided with the second through hole, and second time metal polar plate 4 passes through the second through hole and insulated screw 5
Threaded connection；
Metal polar plate 3 is connected through a screw thread fixation on insulated screw 5 and second.
In the embodiment of the present invention, by the rotation for the handwheel 6 that insulate, insulated screw 5 is driven reversely to turn relative to insulation handwheel 6
It is dynamic, meanwhile, second time metal polar plate 4 is rotate in same direction with insulation handwheel 6, and second time metal polar plate 4 is moved down on insulated screw 5
It is dynamic, so as to adjust on second the distance between metal polar plate 3 and second time metal polar plate 4, change tunable capacitor C2Capacitance,
Reach the purpose of the deviation between amendment and design load.
Further, second resistance R2Two ends be electrically connected respectively with metal polar plate on second 3 and second time metal polar plate 4
Connect.
In embodiments of the present invention, second resistance R2Typically without changing, if the deviation after assembling between design load
It is larger, can be by second resistance R2Changed to meet formula (2).
Further, high-voltage arm 1 includes at least two first metal polar plates 7, and adjacent first metal polar plate 7 two-by-two is by exhausted
Edge support column 8 is spaced the second preset distance, and adjacent first metal polar plate 7 two-by-two is parallel with first resistor 9.
The circular metal plate that the first metal polar plate 7 in the embodiment of the present invention is thickness 2mm, adjacent the first metal pole two-by-two
Plate 7 is parallel with first resistor, and the high-voltage arm 1 of divider is divided into some sections in vertical direction, and every section is all a partial pressure list
Member.Partial pressure unit according to being equidistantly spaced from, accesses high voltage U in vertical direction1Afterwards, uniform electricity can be formed inside divider
Potential gradient lands, and is conducive to preventing the too high generation electric discharge phenomena of local voltage.Meanwhile, the shunt capacitance being made up of metal polar plate,
Possess more preferable temperature stability and time stability than fabricated capacitors, overcome in the market sell capacity cell temperature drift and when
Float the influence to the degree of accuracy.
Further, the outer of first metal polar plate is fixedly installed grading ring 10.
The outer position of each piece of the first metal polar plate 7 is all installed with grading ring 10, grading ring 10 play uniformly, point
The effect of electric field is dissipated, edge, the wedge angle flashover electric discharge under elevated pressure conditions of hardware is prevented.
Further, a kind of broadband divider based on capacitance-resistance parallel-serial provided in an embodiment of the present invention also includes exhausted
Edge high pressure chest and insulation low pressure chamber；
Insulating A High-Voltage chamber is fixedly connected with insulation low pressure chamber by insulating supporting post；
High-voltage arm 1 is arranged at Insulating A High-Voltage intracavitary；
Low-voltage arm 2 is arranged in insulation low pressure chamber；
The bottom of Insulating A High-Voltage chamber is provided with seal socket, and the extraction wire of high-voltage arm 1 passes through seal socket and the electricity of low-voltage arm 2
Gas is connected.
It should be noted that Insulating A High-Voltage chamber is independent sealedly cavity, high-voltage arm 1 and low-voltage arm with insulation low pressure chamber
2, in order to realize electrical connection, it is necessary to set seal socket in the bottom of Insulating A High-Voltage chamber, are drawn high-voltage arm 1 using seal socket
The wire gone out is connected in low-voltage arm 2.
Further, it is full of insulating gas in Insulating A High-Voltage chamber and insulation low pressure chamber.
In embodiments of the present invention, insulating gas is sulfur hexafluoride gas, but among actual application, according to different
Voltage requirements, the insulating gas that other can be selected different, will not be described here.
Further, a kind of broadband divider based on capacitance-resistance parallel-serial provided in an embodiment of the present invention also includes exhausted
Edge umbrella cover 11, Insulating A High-Voltage chamber and insulation low pressure chamber are arranged in insulation umbrella cover 11.
Further, a kind of broadband divider based on capacitance-resistance parallel-serial provided in an embodiment of the present invention also includes bottom
Seat 12, the base 12 is fixedly connected with the bottom for the umbrella cover 11 that insulate；
Insulated screw 5 runs through the top of base 12 by air seal set vertically, and first through hole is passed through in the inside of base 12
It is threadedly coupled with insulation handwheel 6.
In the present embodiment, the actual operation insulation handwheel 6 in base 12, because low pressure chamber needs to keep sealing, insulation
Screw 5 runs through the top of base 12 by air seal set, when manually operating, and insulation handwheel 6 is rotated in base 12, insulation is driven
Screw 5 is rotated, and second time metal polar plate 4 in low pressure chamber is rotated backward because of the rotation of insulated screw 5 so that under second
Metal polar plate 4 is moved up and down in the part that insulated screw 5 remains in low pressure chamber, changes metal polar plate 3 and second time gold on second
Belong to the distance between pole plate 4, so as to change tunable capacitor C2。
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a kind of broadband divider based on capacitance-resistance parallel-serial, it is characterised in that including high-voltage arm and low-voltage arm；
The high-voltage arm is electrically connected with the low-voltage arm；
The low-voltage arm includes second partial pressure unit, and second partial pressure unit includes tunable capacitor and second resistance, institute
State tunable capacitor and the second resistance is connected in parallel；
Wherein, the tunable capacitor be used for adjust its capacitance so that the product of its capacitance and second resistance resistance with it is described
The resistance of high-voltage arm and the product of capacitance are equal.
2. the broadband divider according to claim 1 based on capacitance-resistance parallel-serial, it is characterised in that the adjustable electric
Appearance includes metal polar plate on second, second time metal polar plate and distance adjusting mechanism；
Metal polar plate is parallel with second time metal polar plate on described second and is separated by preset distance setting；
The distance adjusting mechanism is used to adjust the preset distance.
3. the broadband divider according to claim 2 based on capacitance-resistance parallel-serial, it is characterised in that the distance is adjusted
Complete machine structure includes：Insulated screw and insulation handwheel；
Metal polar plate and second time metal polar plate are circular pole plate on described second；
The insulated screw is vertical through metal polar plate, second time metal polar plate and the insulation hand on described second
Wheel；
The insulation handwheel is provided with first through hole, and the insulation handwheel passes through the first through hole and the insulated screw screw thread
Connection；
Second time metal polar plate is provided with the second through hole, second time metal polar plate by second through hole with it is described
Insulated screw is threadedly coupled；
Metal polar plate is connected through a screw thread fixation on the insulated screw and second.
4. the broadband divider according to claim 3 based on capacitance-resistance parallel-serial, it is characterised in that second electricity
The two ends of resistance are electrically connected with metal polar plate on described second and second time metal polar plate respectively.
5. the broadband divider according to claim 4 based on capacitance-resistance parallel-serial, it is characterised in that the high-voltage arm
Including at least two first metal polar plates, adjacent the first metal polar plate described two-by-two by insulating supporting intercolumniation every second it is preset away from
From, and adjacent the first metal polar plate described two-by-two is parallel with first resistor.
6. the broadband divider according to claim 5 based on capacitance-resistance parallel-serial, it is characterised in that first gold medal
The outer of category pole plate is fixedly installed grading ring.
7. the broadband divider according to claim 6 based on capacitance-resistance parallel-serial, it is characterised in that also including insulation
High pressure chest and insulation low pressure chamber；
The Insulating A High-Voltage chamber is fixedly connected with the insulation low pressure chamber by the insulating supporting post；
The high-voltage arm is arranged at the Insulating A High-Voltage intracavitary；
The low-voltage arm is arranged in the insulation low pressure chamber；
The bottom of the Insulating A High-Voltage chamber is provided with seal socket, and the high-voltage arm extraction wire passes through the seal socket and institute
State low-voltage arm electrical connection.
8. the broadband divider according to claim 7 based on capacitance-resistance parallel-serial, it is characterised in that the insulation is high
Press and insulating gas is full of in chamber and the insulation low pressure chamber.
9. the broadband divider according to claim 8 based on capacitance-resistance parallel-serial, it is characterised in that also including insulation
Umbrella cover, the Insulating A High-Voltage chamber and the insulation low pressure chamber are arranged in the insulation umbrella cover.
10. the broadband divider according to claim 9 based on capacitance-resistance parallel-serial, it is characterised in that also the bottom of including
Seat, the base is fixedly connected with the bottom of the insulating sleeve；
The insulated screw is run through behind the top of the base vertically by air seal set, is passed through in the inside of the base described
First through hole is threadedly coupled with the insulation handwheel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710685261.5A CN107271745A (en) | 2017-08-11 | 2017-08-11 | A kind of broadband divider based on capacitance-resistance and series connection |
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| CN201710685261.5A CN107271745A (en) | 2017-08-11 | 2017-08-11 | A kind of broadband divider based on capacitance-resistance and series connection |
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Cited By (5)
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| CN108181493A (en) * | 2018-03-06 | 2018-06-19 | 浙江天际互感器有限公司 | A kind of resistance-capacitance differential pressure type residual voltage sensor |
| CN108957095A (en) * | 2018-06-13 | 2018-12-07 | 贵州电网有限责任公司 | A kind of DC voltage transformer and its voltage test method |
| CN112051434A (en) * | 2020-08-31 | 2020-12-08 | 国网山东省电力公司电力科学研究院 | Precise alternating current-direct current broadband voltage dividing device and method |
| CN112712949A (en) * | 2020-12-17 | 2021-04-27 | 中国电力科学研究院有限公司 | Resistance unit of high-voltage arm of resistance-capacitance voltage divider |
| CN113109615A (en) * | 2021-04-30 | 2021-07-13 | 国网陕西省电力公司电力科学研究院 | Voltage divider for measuring high-voltage harmonic |
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