CN110320395A - On-line monitoring high-precision capacitance-resistance parallel voltage divider - Google Patents
On-line monitoring high-precision capacitance-resistance parallel voltage divider Download PDFInfo
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- CN110320395A CN110320395A CN201910574941.9A CN201910574941A CN110320395A CN 110320395 A CN110320395 A CN 110320395A CN 201910574941 A CN201910574941 A CN 201910574941A CN 110320395 A CN110320395 A CN 110320395A
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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
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
Abstract
The present invention relates to power industry high-tension measurement fields, are related specifically to a kind of novel on-line monitoring high-precision capacitance-resistance parallel voltage divider.On-line monitoring high-precision capacitance-resistance parallel voltage divider, including pedestal, have been arranged vertically upwards composite insulator, composite insulator inner hollow, and be provided with high-voltage arm on the base；The upper end of the high-voltage arm is connected with the high-voltage connection terminal being arranged at the top of composite insulator, and lower end is connected with low-voltage arm, and is combined with shielding shell；Embedded with the output terminal being connect with low-voltage arm on the shielding shell.The present invention utilizes resistance capacitance voltage divider principle, the amplitude voltage signal for being difficult to measure is changed into the low amplitude value voltage signal convenient for observation, stray inductance can be reduced with the design of low pressure arm configuration to greatest extent by using a plurality of capacitance-resistance branch in parallel and choosing low sensing unit, measurement accuracy when measurement nanosecond Fast-Pulse Measuring can be improved, compensating unit is added between high-voltage arm and low-voltage arm, it can be with further expansion bandwidth.
Description
Technical field
The present invention relates to power industry high-tension measurement fields, are related specifically to a kind of novel on-line monitoring high-precision capacitance-resistance
Parallel voltage divider.
Background technique
Transient overvoltage in substation/converter station seriously threatens the safety of high-tension electricity equipment and secondary device.According to
Statistics, overvoltage are in space of top prominence in the inducement of electric power system fault.Transient overvoltage type in substation/converter station
Very much, including lightning surge, switching overvoltage, power-frequency overvoltage, very fast transient overvoltage etc..When electric system power transmission and transformation
When equipment or neighbouring object are by being struck by lightning, lightning surge can invade electric system directly or by induction；When in electric system
Breaker and disconnecting switch are operated, or when failure, will appear various switching overvoltages in the power system；Work as electricity
When Force system parameter configuration is improper or meets certain conditions, system is likely to occur resonance overvoltage；When gas-insulated metal-enclosed
When disconnecting switch acts in formula combined electrical apparatus (Gas Insulated Switchgears, GIS), it is possible to inside GIS, outside
On shell and adjacent power equipment formed very fast transient overvoltage (Very Fast Transient Over-voltage,
VFTO).These overvoltage not only threaten the insulation safety of high voltage installation, also due to overvoltage is propagated to secondary device,
Cause secondary equipment in power system failure, with the development of smart grid, GIS attached intelligent component is more and more, this
It threatens increasingly severe.Transient overvoltage in electric system is monitored and is recorded, Electric Power Equipment Insulation is not only contributed to and matches
It closes, has extremely important meaning to the safe and reliable operation for ensureing power equipment, also have product to the inhibition of overvoltage and protection
The effect of pole.
Before this, operation power department, power equipment manufacturer and scientific research department are for substation/converter station transient state electricity
Pressure detection and monitor log have carried out a large amount of research, develop the various transient voltage monitoring systems based on different principle, and
Carry out in the power system on probation.But the transient voltage measuring system of different principle is in safety, measurement frequency bandwidth, environment
Adaptability etc. respectively has advantage and disadvantage, it is difficult to carry out accurate evaluation.
Therefore, it needs to develop relevant detection device, school is carried out to the transient voltage measuring system frequency response in electric system
It tests and assesses.This has vital effect to accuracy that is accurate, quickly and safely understanding transient voltage measured value, is
A major issue of electric system Electric Measurement Technology at present.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of on-line monitoring high-precision capacitance-resistance parallel voltage divider, mention
The high precision of transient voltage detection.
The present invention is achieved through the following technical solutions: on-line monitoring high-precision capacitance-resistance parallel voltage divider, including pedestal,
It has been arranged vertically upwards composite insulator, the composite insulator inner hollow on the pedestal, and has been provided with high-voltage arm；It is described
The upper end of high-voltage arm be connected with the high-voltage connection terminal being arranged at the top of composite insulator, lower end is connected with low-voltage arm, and matches
Conjunction has shielding shell；Embedded with the output terminal being connect with low-voltage arm on the shielding shell.
Further, to better implement the present invention, especially using such as following settings: being filled out inside the composite insulator
Dielectric filled with submergence high-voltage arm.
Further, to better implement the present invention, especially using such as following settings: the dielectric uses transformation
Device oil.
Further, to better implement the present invention, especially using such as following settings: the low-voltage arm includes successively connecting
The compensating unit and low sense PCB capacitance-resistance thin slice, the compensating unit connect is connect with high-voltage arm, and the low sense PCB capacitance-resistance is thin
Piece is connect with the output terminal.
Further, to better implement the present invention, especially using such as following settings: the high-voltage arm includes support
Frame, is connected with multiple capacitance-resistance branches from top to bottom on the support frame, and each capacitance-resistance branch includes the damping electricity being cascaded
Resistance and high-voltage capacitance, each the capacitance-resistance branch and a parallel connection direct resistor coupled in parallel.
Further, to better implement the present invention, especially using such as following settings: capacitance-resistance branch as described in each and simultaneously
A bucking electrode is connected after joining D.C. resistance parallel connection, and parallel connection direct resistance is placed in the center of the bucking electrode.
Further, to better implement the present invention, especially using such as following settings: the high-voltage capacitance uses low sense
Ceramic condenser.
Further, to better implement the present invention, especially using such as following settings: the damping resistance and parallel connection is straight
Leakage resistance is all made of low sense glaze resistance.
The present invention has the advantage that and the utility model has the advantages that the present invention is greatly reduced using measures such as low sensing units
The stray inductance of equipment improves measurement accuracy of the invention.Improving survey in such a way that low-voltage arm increases compensating unit
Measure result waveform, improve frequency bandwidth of the invention, can monitor on-line simultaneously express fast instantaneous voltage, lightning wave, operation wave,
The multiple voltages signal such as power-frequency voltage and DC voltage.The present invention utilizes resistance capacitance voltage divider principle, it may be difficult to the high-amplitude of measurement
Threshold voltage signal is changed into the low amplitude value voltage signal for being convenient for observation, and the damping resistance in every level-one high-voltage arm unit is to height
The response of frequency voltage signal optimizes, and uses a plurality of capacitance-resistance branch in parallel and chooses low sensing unit with low-voltage arm PCB construction
Design can reduce stray inductance to greatest extent, thus concussion problem when being obviously improved measurement high-frequency voltage signal.?
Compensating unit is added between high-voltage arm and low-voltage arm, measurement nanosecond fast pulse letter can be improved with further expansion bandwidth
Number when measurement accuracy.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.
Fig. 1 is a kind of structural schematic diagram that on-line monitoring of the invention uses high-precision capacitance-resistance parallel voltage divider；
Fig. 2 is the schematic cross-sectional view in Fig. 1 along A-A；
Fig. 3 is the circuit topological structure figure that on-line monitoring of the invention uses high-precision capacitance-resistance parallel voltage divider；
In figure, 1-grading ring, 2-high-voltage connection terminals, 3-composite insulators, 4-high-voltage arms, 5-dielectrics,
6-support frames, 7-bucking electrodes, 8-parallel connection direct resistance, 9-high-voltage capacitances, 10-damping resistances, 11-compensating units,
12-low-voltage arms, 13-low sense PCB capacitance-resistance thin slices, 14-metal shells, 15-output terminals, 16-pedestals.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment:
As shown in Figure 1 to Figure 3, on-line monitoring of the invention high-precision capacitance-resistance parallel voltage divider, including pedestal 16, at this
It has been arranged vertically upwards composite insulator 3,3 inner hollow of composite insulator on pedestal 16, and has been provided with high-voltage arm 4；
The upper end of the high-voltage arm 4 is connected with the high-voltage connection terminal 2 that 3 top of composite insulator is arranged in, and lower end is connected with low pressure
Arm 12, and it is combined with shielding shell 14；Embedded with the output terminal 15 being connect with low-voltage arm 12 on the shielding shell 14.
The present invention is greatly reduced the stray inductance of equipment, is improved survey of the invention using measures such as low sensing units
Accuracy of measurement.Improving measurement result waveform, improving bandwidth of the invention in such a way that low-voltage arm increases compensating unit
Degree can monitor the multiple voltages letters such as express fast instantaneous voltage, lightning wave, operation wave, power-frequency voltage and DC voltage on-line simultaneously
Number.The present invention utilizes resistance capacitance voltage divider principle, it may be difficult to which the amplitude voltage signal of measurement is changed into convenient for observation by a narrow margin
Threshold voltage signal, the damping resistance in every level-one high-voltage arm unit are optimized to the response to high-frequency voltage signal, are adopted
Stray inductance can be reduced to greatest extent with the design of low pressure arm configuration with a plurality of capacitance-resistance branch in parallel and selection low sensing unit, from
And it is obviously improved concussion problem when measuring high-frequency voltage signal.Compensating unit is added between high-voltage arm and low-voltage arm, it can
With further expansion bandwidth, measurement accuracy when measurement nanosecond Fast-Pulse Measuring can be improved.
When specifically used, this patent equipment, first pedestal 16 are installed in substation, can be carried out by foundation bolt
It is fixed, then the devices such as low-voltage arm 12, high-voltage arm 4 and composite insulator 3 are installed, be installed rear high-voltage connection terminal 2 with
High-voltage end connection to be measured, it is real by 15 connecting detection equipment of output terminal after being depressured by devices such as high-voltage arm 4, low-voltage arms 12
Now detect.The amplitude voltage signal for being difficult to measure is changed into the low amplitude value voltage signal convenient for observation, every level-one high-voltage arm
Damping resistance in unit is optimized to the response to high-frequency voltage signal, using a plurality of capacitance-resistance branch in parallel and selection
Low sensing unit can reduce stray inductance with the design of low pressure arm configuration to greatest extent, to be obviously improved measurement high-frequency voltage
Concussion problem when signal, improves detection accuracy.It is worth noting that, the detection device can be using oscillograph, record
Wave instrument or other equipment.
Preferably, on the basis of the above embodiments, for the more preferable low implementation present invention, the composite insulator 3
Dielectric 5 of the inside filled with submergence high-voltage arm 4, plays preferable insulating effect, reduces stray inductance, improve inspection
Survey precision.The dielectric 5 generally uses transformer oil.
Preferably, on the basis of the above embodiments, for the more preferable low implementation present invention, the low-voltage arm 12 includes
Sequentially connected compensating unit 11 and low sense PCB capacitance-resistance thin slice 13, the compensating unit 11 is connect with high-voltage arm 4, described
Low sense PCB capacitance-resistance thin slice 13 is connect with the output terminal 15.It is thin in high-voltage arm 4 and low sense PCB capacitance-resistance after designing in this way
Compensating unit 11 is added between piece 13, can be with further expansion bandwidth, measurement essence when improving measurement nanosecond Fast-Pulse Measuring
Degree.
Preferably, on the basis of the above embodiments, for the more preferable low implementation present invention, the high-voltage arm 4 includes
Support frame 6 is connected with multiple capacitance-resistance branches from top to bottom on the support frame 6, and each capacitance-resistance branch includes being cascaded
Damping resistance 10 and high-voltage capacitance 9, each capacitance-resistance branch are in parallel with a parallel connection direct resistance 8.By capacitance-resistance branch,
The effect of parallel connection direct resistance 8 etc., it may be difficult to the letter of threshold voltage by a narrow margin that the amplitude voltage signal of measurement is changed into convenient for observation
Number, the damping resistance in every level-one capacitance-resistance branch is optimized to the response to high-frequency voltage signal, improves detection essence
Degree.
Further, a bucking electrode 7 is connected after each capacitance-resistance branch is in parallel with parallel connection direct resistance 8, and
Parallel connection direct resistance 8 is placed in the center of the bucking electrode 7, greatly reduces the stray inductance of equipment after design in this way, mentions
High measurement accuracy of the invention.
Preferably, the high-voltage capacitance 9 uses low sense ceramic condenser to greatly reduce after designing in this way
The stray inductance of equipment improves measurement accuracy of the invention.
Preferably, the damping resistance 10 and parallel connection direct resistance 8 is all made of low sense glaze resistance, set in this way
After meter, the stray inductance of equipment is further reduced, improves measurement accuracy of the invention.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (8)
1. on-line monitoring high-precision capacitance-resistance parallel voltage divider, it is characterised in that: including pedestal (16), erected on the pedestal (16)
It has directly set up composite insulator (3), the composite insulator (3) inner hollow, and has been provided with high-voltage arm (4)；It is described
The upper end of high-voltage arm (4) be connected with high-voltage connection terminal (2) at the top of composite insulator (3) be set, lower end is connected with low
Pressure arm (12), and it is combined with shielding shell (14)；Embedded with the output being connect with low-voltage arm (12) on the shielding shell (14)
Terminal (15).
2. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 1, it is characterised in that: described is compound
Dielectric (5) filled with submergence high-voltage arm (4) inside insulator (3).
3. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 2, it is characterised in that: the insulation
Medium (5) uses transformer oil.
4. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 1, it is characterised in that: the low pressure
Arm (12) includes sequentially connected compensating unit (11) and low sense PCB capacitance-resistance thin slice (13), the compensating unit (11) and high
Pressure arm (4) connection, the low sense PCB capacitance-resistance thin slice (13) connect with the output terminal (15).
5. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 4, it is characterised in that: the high pressure
Arm (4) includes support frame (6), is connected with multiple capacitance-resistance branches from top to bottom on the support frame (6), and each capacitance-resistance branch includes
The damping resistance (10) and high-voltage capacitance (9) being cascaded, each the capacitance-resistance branch and a parallel connection direct resistance (8)
It is in parallel.
6. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 5, it is characterised in that: described in each
A bucking electrode (7) is connected after capacitance-resistance branch is in parallel with parallel connection direct resistance (8), and parallel connection direct resistance (8) is placed in the screen
Cover the center of electrode (7).
7. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 6, it is characterised in that: the high pressure
Capacitor (9) uses low sense ceramic condenser.
8. on-line monitoring high-precision capacitance-resistance parallel voltage divider according to claim 6, it is characterised in that: the damping
Resistance (10) and parallel connection direct resistance (8) are all made of low sense glaze resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910574941.9A CN110320395A (en) | 2019-06-28 | 2019-06-28 | On-line monitoring high-precision capacitance-resistance parallel voltage divider |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910574941.9A CN110320395A (en) | 2019-06-28 | 2019-06-28 | On-line monitoring high-precision capacitance-resistance parallel voltage divider |
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| CN201910574941.9A Pending CN110320395A (en) | 2019-06-28 | 2019-06-28 | On-line monitoring high-precision capacitance-resistance parallel voltage divider |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884739A (en) * | 2021-08-20 | 2022-01-04 | 中国电力科学研究院有限公司 | Broadband voltage divider device and scale factor calibration method |
| CN114509592A (en) * | 2022-04-20 | 2022-05-17 | 山东泰开互感器有限公司 | Capacitor voltage transformer with electric energy quality monitoring function |
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| DE102015106090A1 (en) * | 2015-04-21 | 2016-10-27 | Dipl.-Ing. H. Horstmann Gmbh | Method and. Device for setting a capacitive voltage test system |
| CN107179429A (en) * | 2017-05-09 | 2017-09-19 | 西安交通大学 | A kind of new capacitance-resistance parallel voltage divider |
| CN206618791U (en) * | 2016-11-10 | 2017-11-07 | 许继电气股份有限公司 | A kind of wide-band capacitor compensating formula resitstance voltage divider |
| CN207164120U (en) * | 2017-09-11 | 2018-03-30 | 信电电器集团有限公司 | Capacitance partial pressure electronic type voltage transformer with phase compensation device |
| CN109324216A (en) * | 2018-11-13 | 2019-02-12 | 中国电力科学研究院有限公司 | Low-voltage arm and transient voltage measuring device |
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2019
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Patent Citations (6)
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| CN103323640A (en) * | 2013-06-25 | 2013-09-25 | 中国西电电气股份有限公司 | Extra-high-voltage direct-voltage voltage divider with heat dissipation device |
| DE102015106090A1 (en) * | 2015-04-21 | 2016-10-27 | Dipl.-Ing. H. Horstmann Gmbh | Method and. Device for setting a capacitive voltage test system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884739A (en) * | 2021-08-20 | 2022-01-04 | 中国电力科学研究院有限公司 | Broadband voltage divider device and scale factor calibration method |
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| CN114509592A (en) * | 2022-04-20 | 2022-05-17 | 山东泰开互感器有限公司 | Capacitor voltage transformer with electric energy quality monitoring function |
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Application publication date: 20191011 |