CN202676780U - Cvt transient overvoltage sampling device - Google Patents
Cvt transient overvoltage sampling device Download PDFInfo
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- CN202676780U CN202676780U CN 201220345867 CN201220345867U CN202676780U CN 202676780 U CN202676780 U CN 202676780U CN 201220345867 CN201220345867 CN 201220345867 CN 201220345867 U CN201220345867 U CN 201220345867U CN 202676780 U CN202676780 U CN 202676780U
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- sampling
- transient overvoltage
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- voltage
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Abstract
The utility model relates to a voltage sampling device, and particularly relates to a CVT transient overvoltage sampling device which is structurally characterized in that the CVT transient overvoltage sampling device comprises a voltage dividing capacitor Cs, an impedance matching resistor R1, an impedance matching resistor R2, and a sample output circuit, wherein the voltage dividing capacitor is connected between a grounding circuit and a grounding electrode of CVT equipment in series; sampling terminals are introduced from both ends of the Cs respectively; the sampling terminals are connected to a wave form test circuit through the impedance matching resistors respectively and then through the sample output circuit. The CVT transient overvoltage sampling circuit has the advantages that voltage diving sampling is carried out without a need of a high-voltage resistance-capacitance divider which is huge in volume and heavy, and sampling of transient overvoltage signals of electric transmission lines can be realized by applying the existing CVT equipment and adopting the low-voltage voltage diving capacitor; the device is highly accurate in sampling data, simple in structure, small in volume, and convenient in transportation and carrying; the assembly and disassembly are fast and convenient; and the safety and the reliability are high.
Description
Technical field
The utility model relates to a kind of voltage sampling device, particularly a kind of CVT transient overvoltage sampler.
Background technology
In the electric system of 500kV electric pressure, when transmission line of electricity carries out switching manipulation, transient overvoltage will occur on the circuit, will threaten the insulation of the converting equipment that is attached thereto when serious, therefore, new line starts need carry out the transient overvoltage test when putting into operation.In order to obtain over-voltage waveform on the circuit and amplitude size, generally need to the superpotential sampler be installed at ultra-high-tension power transmission line, traditional means is at line end special integrated RC divider to be installed to obtain transient overvoltage signal on the circuit.
Because special integrated voltage divider is directly to be connected on the ultra-high-tension power transmission line, transient voltage can reach the hundreds of thousands volt, therefore needs to adopt multistage high-pressure resistance-capacitance arm to carry out dividing potential drop, then carries out efficient sampling at safe and reliable voltage node.Yet multistage high-pressure resistance-capacitance voltage divider arrangement has the following disadvantages: owing to be directly connected on the high-tension line, Insulation Problems is comparatively outstanding, need larger physical dimension and fill more insulating medium, so equipment is very heavy, floor area is large, mounts and dismounts all very inconvenient; Equipment is interim access, causes its security not high, and the multistage protection measure need to be arranged.Therefore restriction is a lot of in actual applications.
The utility model content
The purpose of this utility model be according to existing integrated voltage divider use the upper deficiency that exists provide a kind of simple in structure, carry convenient transportation, quick, safe and reliable, the accurately CVT transient overvoltage sampler of sampling of dismounting.
The purpose of this utility model realizes by following approach:
CVT transient overvoltage sampler, its structural feature is: include dividing potential drop capacitor C s, build-out resistor R1 and R2 and sampling output circuit, wherein dividing potential drop capacitor C s is plugged between CVT equipment ground loop and the earthing pole, and draw respectively the sampling terminal at the Cs two ends, each sampling terminal is connected to the sampling output circuit by a build-out resistor respectively, is connected on the difference measurement equipment by the sampling output circuit again.
CVT is capacitance type potential transformer, and its structure mainly generally is made of two joints high-voltage capacitance C1(500kV electric pressure), intermediate capacitance C2, intermediate transformer, current limiting reactor etc. form.Because the electric capacity of high-voltage capacitance C1 is less, terminal at intermediate capacitance C2, after serial connection enters suitable dividing potential drop capacitor C S on the node that namely voltage is lower, can obtain comparatively ideal intrinsic standoff ratio, simultaneously can guarantee that voltage waveform has preferably transient response, so the sampled data accuracy is high.
Because the point of CVT place transmission line of electricity is the low voltage node, also just so that its ground loop is low tension loop, the dividing potential drop electric capacity of a needs access low pressure can be realized the effective dividing potential drop to transient overvoltage at this moment, finish sampling to the transient overvoltage signal by impedance matching resistance and sampling output circuit again, eliminated the factor that equipment is heavy, floor area is large of bringing because of Insulation Problems, so that device described in the utility model can be simple in structure, volume is small and exquisite, carry convenient transportation, dismounting is quick, and low-pressure side is installed, and is safe and reliable.
The utility model can further be specially:
Dividing potential drop capacitor C s is composed in parallel by a plurality of monomer capacity cells.
Like this, can improve the reliability of sampling dividing potential drop electric capacity.
This monomer capacity cell is a kind of type metal foil type polypropylene capacitor.
This type metal foil type polypropylene capacitor can the Effective Raise sampler shock resistance.
Monomer capacity cell in parallel is 10-20, and the electric capacity of each capacity cell is 20-50 μ F.
Because the selection of dividing potential drop capacitance parameter will be considered the sensitivity of signal amplitude, transmission range, harvester, and on the impact of capacitance type potential transformer no-load voltage ratio value etc., generally its value can be taken as about 3000～10000 times of coupling condenser.Like this, the magnitude of voltage (effectively) that needs dividing potential drop electric capacity to collect is about about 20～40V.
Impedance matching resistance R 1=R2, concrete numerical value is selected according to the actual measurement wave impedance of transmission coaxial-cable.
The sampling output circuit includes heart yearn output cable and ground wire output cable, wherein ground wire output line conductor wire and shield equal reliable ground.
Further, can also be:
Heart yearn output cable and ground wire output cable are the coaxial paired cable of difference.
The coaxial paired cable of this difference can transfer to the overvoltage signal of sampling the distant signal receiver and finish sampling to the transient overvoltage signal.
In sum, the utility model provides a kind of CVT transient overvoltage sampler, utilizes the existing CVT equipment of transformer station, adopts the realization of low pressure dividing potential drop electric capacity to the sampling of transient overvoltage signal.Through laboratory power frequency and the comparison of lightning impulse voltage waveform, the sampled data accuracy is high, frequency response characteristic is better, the demand of transient overvoltage test in the time of can satisfying the debugging of 50kV transmission line of electricity start-up system.This sampler is simple in structure, and volume is small and exquisite, transports easy to carry, safe and reliable.
Description of drawings
Figure 1 shows that the operating circuit theory structure synoptic diagram of CVT transient overvoltage sampler described in the utility model; Be depicted as the circuit theory diagrams of superpotential sampler in the dotted line frame.
Below in conjunction with embodiment the utility model is described further.
Specific embodiment
Most preferred embodiment:
With reference to accompanying drawing 1, among the figure, C1 is the equivalent capacity of high pressure primary equipment, and C2 and secondary output T are the equivalent ground loop of CVT.
CVT transient overvoltage sampler, include dividing potential drop capacitor C s, impedance matching resistance R 1 and R2 and sampling output circuit, wherein impedance matching resistance R 1=R2, dividing potential drop capacitor C s is serially connected between CVT equipment ground loop and the earthing pole, and draw respectively the sampling terminal at the Cs two ends, each sampling terminal is connected to test loop by a build-out resistor by the sampling output circuit respectively.
Dividing potential drop capacitor C s is composed in parallel by 10-20 monomer capacity cell, and the electric capacity of each capacity cell is 20-50 μ F.The monomer capacity cell that adopts is a kind of type metal foil type polypropylene capacitor.
The sampling output circuit includes heart yearn output cable L1 and ground wire output cable L2, wherein ground wire output cable L2 should be reliably ground connection nearby, and heart yearn output cable L1 and ground wire output cable L2 are the coaxial paired cable of difference, and the coaxial paired cable of this difference can transfer to the overvoltage signal of sampling distance measuring device and finish record and measurement to the transient overvoltage signal.
Those skilled in the art utilize the high-voltage capacitance conduct minute pressure arm of the capacitance type potential transformer (CVT) of on-the-spot intrinsic configuration, have developed the transient overvoltage sampler of special construction, and have verified the technical validity of sampler.
It is same as the prior art that the utility model is not stated part.
Claims (7)
1.CVT transient overvoltage sampler, it is characterized in that, include dividing potential drop capacitor C s, impedance matching resistance R 1 and R2 and sampling output circuit, wherein dividing potential drop capacitor C s is serially connected between CVT equipment ground loop and the earthing pole, and draw respectively the sampling terminal at the Cs two ends, each sampling terminal is connected to the sampling output circuit by a build-out resistor respectively, is connected on the difference measurement equipment by the sampling output circuit again.
2. CVT transient overvoltage sampler according to claim 1 is characterized in that, dividing potential drop capacitor C s is composed in parallel by a plurality of monomer capacity cells.
3. CVT transient overvoltage sampler according to claim 2 is characterized in that, this monomer capacity cell is a kind of type metal foil type polypropylene capacitor.
4. CVT transient overvoltage sampler according to claim 2 is characterized in that, monomer capacity cell in parallel is 10-20, and the electric capacity of each capacity cell is 20-50 μ F.
5. CVT transient overvoltage sampler according to claim 1 is characterized in that, impedance matching resistance R 1=R2.
6. CVT transient overvoltage sampler according to claim 1 is characterized in that, the sampling output circuit includes heart yearn output cable and ground wire output cable, and wherein ground wire output cable is connected in the earthing pole.
7. CVT transient overvoltage sampler according to claim 6 is characterized in that, heart yearn output cable and ground wire output cable are the coaxial paired cable of difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220345867 CN202676780U (en) | 2012-07-16 | 2012-07-16 | Cvt transient overvoltage sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220345867 CN202676780U (en) | 2012-07-16 | 2012-07-16 | Cvt transient overvoltage sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202676780U true CN202676780U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220345867 Expired - Fee Related CN202676780U (en) | 2012-07-16 | 2012-07-16 | Cvt transient overvoltage sampling device |
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| CN (1) | CN202676780U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106537157A (en) * | 2014-07-18 | 2017-03-22 | 西门子公司 | Redundant solution of outputs on a rc voltage divider |
-
2012
- 2012-07-16 CN CN 201220345867 patent/CN202676780U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106537157A (en) * | 2014-07-18 | 2017-03-22 | 西门子公司 | Redundant solution of outputs on a rc voltage divider |
| CN106537157B (en) * | 2014-07-18 | 2019-03-26 | 西门子公司 | The redundancy solution of output on RC divider |
| US10630074B2 (en) | 2014-07-18 | 2020-04-21 | Siemens Aktiengesellschaft | Redundant solution of outputs on a RC voltage divider |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID FUJIAN ELECTRIC POWER CO., LTD. Effective date: 20141226 Owner name: STATE GRID FUJIAN ELECTRIC POWER CO., LTD. ELECTRI Effective date: 20141226 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee |
Owner name: ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID FUJI Free format text: FORMER NAME: FUJIAN ELECTRIC POWER CO., LTD., ELECTRIC POWER RESEARCH INSTITUTE |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 350007 FUZHOU, FUJIAN PROVINCE TO: 100031 XICHENG, BEIJING |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 350007 No. 48, Garden Road, Cangshan District, Fujian, Fuzhou Patentee after: STATE GRID FUJIAN ELECTRIC POWER Research Institute Address before: 350007 No. 48, Garden Road, Cangshan District, Fujian, Fuzhou Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF FUJIAN ELECTRIC POWER Co.,Ltd. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20141226 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. Patentee after: STATE GRID FUJIAN ELECTRIC POWER Research Institute Address before: 350007 No. 48, Garden Road, Cangshan District, Fujian, Fuzhou Patentee before: STATE GRID FUJIAN ELECTRIC POWER Research Institute |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20190716 |
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| CF01 | Termination of patent right due to non-payment of annual fee |