CN204228940U - A kind of voltage transformer (VT) on-line testing system based on SF6 parallel plate capacitor - Google Patents
A kind of voltage transformer (VT) on-line testing system based on SF6 parallel plate capacitor Download PDFInfo
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- CN204228940U CN204228940U CN201420662528.0U CN201420662528U CN204228940U CN 204228940 U CN204228940 U CN 204228940U CN 201420662528 U CN201420662528 U CN 201420662528U CN 204228940 U CN204228940 U CN 204228940U
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Abstract
A kind of based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, comprises primary voltage sensing unit, digital collection unit, optical signal processing unit and intelligent processing unit, and primary voltage sensing unit adopts SF
6plane-parallel capacitor, as voltage sensor unit, obtains primary voltage signal by the electric current in Detection capacitance.SF
6plane-parallel capacitor is provided with the air pressure monitor device for gaseous tension in monitoring capacitor, and primary voltage sensing unit is connected with digital collection unit, and digital collection unit connects intelligent processing unit by optical signal processing unit.The utility model, greatly reduces the complexity of voltage transformer (VT) field-checking, simplifies operating process.
Description
Technical field
The utility model is a kind of based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, for electronic type voltage transformer in transformer station or conventional voltage transformer when circuit does not have a power failure, carry out real-time accuracy verification or monitoring running state.
Background technology
As one of crucial measuring equipment in electric system, the accuracy of mutual inductor and stability are the guarantees that power system safety and stability runs.In order to ensure the accuracy of mutual inductor, need to verify mutual inductor.
No matter be for traditional mutual inductor at present, or for electronic mutual inductor, verification mode mainly adopts off-line verification mode, that is: by the line outage at verification mutual inductor place, mutual inductor is out of service from electrical network, then utilize boosting, up-flow device to mutual inductor applying excitation, carry out the verification of accuracy.This verification mode cycle is long, and operation required during each verification is very complicated, needs out work ticket, the cooperation of multiple department etc., brings very large inconvenience to electric company and user.In addition, the utilization of electronic type mutual-inductor in digitalization transforming plant is had higher requirement to calibration technology.Compared with traditional mutual inductor, electronic mutual inductor has very large advantage in sensing principle, Optical Fiber Transmission etc., and application is more and more.But owing to being emerging technology, also occurred more problem in operational process, wherein accuracy problems accounts for larger specific gravity, outstanding behaviours is serious at accuracy off-gage phenomenon, error robustness is poor, accuracy problems occurrence frequency more high in.Therefore, the check-verifying period shortening electronic mutual inductor is needed.If adopt conventional offline verification mode, check-verifying period shortens and means and have a power failure frequently, brings inconvenience and loss of outage is large.Therefore, need research under circuit electriferous state, the device of on-line testing can be carried out to mutual inductor.
Fewer for the research of electronic type voltage transformer on-line testing technology at present, trace it to its cause mainly contain following some: one is that standard mutual inductor when verifying at present is generally electromagnetic transformer, along with the raising volume of electric pressure is very heavy, be unfavorable for on-the-spot use.Therefore, the New Sensing Technology that volume is little, lightweight, accuracy is high becomes the difficult point of research; Two is how in the charged situation of circuit, to obtain primary voltage signal online, and current hot line job adopts the form of insulating bar usually, and this action need operating personnel hand-held bar completes, and there is potential safety hazard when circuit is charged.Therefore, the safe acquisition technique of primary voltage signal is second Research Challenges.
Patent CN102645643A proposes a kind of electronic type voltage transformer on-line testing system, adopts conventional electromagnetic voltage transformer (VT) as standard mutual inductor.When electric pressure higher (more than 220kv), volume and the weight of electromagnetic potential transformer sharply increase, and be therefore unfavorable for onsite application, and insulation costs sharply rise.In addition, electromagnetic potential transformer, as induction equipment, likely produces resonance overvoltage when accessing charged bus, there is certain security risk.Patent CN102401889A and CN102313879A proposes the on-line testing method for electronic current mutual inductor, but can only be used for the verification of current transformer, can not be used for the verification of voltage transformer (VT).
Summary of the invention
For the deficiency that current voltage transformer (VT) calibration technology exists, the utility model provides a kind of based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, adopts SF
6parallel plate capacitor is as voltage sensor unit, obtain primary voltage signal by the current signal detected wherein, under equal electric pressure, greatly reduce the volume and weight of standard mutual inductor, insulating Design also becomes simple, thus makes the realization of on-line testing more simple.
The technical solution of the utility model is as follows:
A kind of based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, comprises primary voltage sensing unit, digital collection unit, optical signal processing unit and intelligent processing unit, and primary voltage sensing unit adopts SF
6plane-parallel capacitor, as voltage sensor unit, obtains primary voltage signal by the electric current in Detection capacitance;
SF
6plane-parallel capacitor is provided with the air pressure monitor device for gaseous tension in monitoring capacitor, and primary voltage sensing unit is connected with digital collection unit, and digital collection unit connects intelligent processing unit by optical signal processing unit.
Described SF
6plane-parallel capacitor includes high-field electrode, low-field electrode and insulating sleeve, and high-field electrode, low-field electrode and insulating sleeve form a closed, and inside is filled with SF
6insulating gas or N
2and SF
6mixed gas.Both can ensure the insulating property of capacitor, inner this environment can form a kind of gas capacitor again.
Be provided with air pressure monitor device, grading ring above described high-field electrode, high-field electrode and grading ring form a metal cage.Capacitor is connected with a wire by grading ring, and grading ring plays the effect connecting wire, the electric field around capacitor can also be made to become even, prevent point discharge disturbed test result.
Be provided with digital collection unit below primary voltage sensing unit, digital collection unit is connected with primary voltage sensing unit by shielded cable.
Described digital collection unit with between optical signal processing unit by synchronous optical fiber, data Fiber connection.Optical signal processing unit connects intelligent processing unit by USB transmission line.
Primary voltage sensing unit is arranged on hoistable platform, and described hoistable platform connects telechiric device.Hoistable platform is positioned on mobile trolley.
Described intelligent processing unit is desk-top computer or notebook.
The utility model relates to a kind of based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, technique effect is as follows:
1), gas monitoring apparatus is used for the gaseous tension of Real-Time Monitoring inside.When air pressure is less than a certain numerical value, alert is inflated, to ensure the accuracy of measurement result.After apply excitation in capacitor high-field electrode, have current signal in electric capacity and produce, by detecting the size of electric current and carrying out certain computing, the size of primary voltage can be drawn.Electric current in electric capacity exports and directly enters digital collection unit, current signal is converted to voltage signal, and after carrying out A/D conversion, is carried out the framing process of data by FPGA.Current signal is connected with digital collection unit by shielded cable.
2), digital collection unit is positioned at below capacitor low-field electrode, its effect is after the electric current in capacitor is converted to voltage, carry out A/D conversion and become digital quantity, then carry out framing process through FPGA by certain form, and by the downward Primary Transmit of optical fiber.Digital collection unit adopts precision resistance to realize current/voltage-converted, and adopts high-precision 24 A/D converters to realize the digitizing of simulating signal, and digitized signal directly enters FPGA and carries out processing and sending.
3), described optical signal processing unit, be optical fiber with the connected mode of digital collection unit, after row format that the data receiver in digital collection unit is gone forward side by side conversion, be transferred to intelligent processing unit and carry out analyzing and processing.
4), SF is adopted in the utility model
6plane-parallel capacitor is as standard potential transformer, and volume is little, lightweight.Along with the raising of line voltage distribution grade, the change of its volume and weight is little, is very applicable to onsite application.The such as capacitor of 220kV grade, its weight is no more than 10kg, and the electromagnetic potential transformer of ad eundem, weight is more than 100kg.
5), SF
6plane-parallel capacitor is fixed on hoistable platform when using, and is fixed on moveable small handcart, forms an entirety, ensures mobility during on-the-spot on-line testing.During execute-in-place, first small handcart is pushed into by the below of verification mutual inductor place wire, the line of system various piece is connected.Operator controls the landing of hoistable platform a long way off by telepilot, be connected by the grading ring above capacitor with a wire, then starts verification.After completing verification, remote pilot hoistable platform, exits by capacitor from a wire.
6), the utility model on-line testing system, when circuit does not have a power failure, the on-line testing of voltage transformer (VT) can be completed, simplifies checking process, shorten check-verifying period, avoid the loss that line outage causes.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of the utility model on-line testing system.
Fig. 2 is SF of the present utility model
6the enlarged diagram on plane-parallel capacitor top.
Fig. 3 is digital collection unit of the present utility model and SF
6the connection diagram of plane-parallel capacitor.
Embodiment
As shown in Figure 1, a kind of based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, by SF
6the part such as plane-parallel capacitor, digital collection unit 6, hoistable platform 7, small handcart 8, optical signal processing unit 11 and intelligent processing unit 13 is formed.SF
6be connected by shielded cable between plane-parallel capacitor with digital collection unit 6; Be connected by optical fiber 9 between digital collection unit 6 with optical signal processing unit 11; Be connected by USB transmission line 12 between optical signal processing unit 11 and intelligent processing unit 13.
Described SF
6plane-parallel capacitor is formed primarily of high-field electrode 3, insulating sleeve 4 and low-field electrode 5, and inside is filled with SF
6gas or SF
6gaseous mixture.Be air pressure monitor device 2 and grading ring 1 above high-field electrode 3.Grading ring 1 and high-field electrode 3 entirety form a metal cage, playing good shielding action, ensureing that it can be monitored air pressure accurately, as shown in Figure 2 to being in inner air pressure monitor device 2.SF
6plane-parallel capacitor is positioned on hoistable platform 7 and mobile trolley 10, and hoistable platform 7 can regulate according to the difference of on-the-spot line levels, thus can be used for the on-line testing of the voltage transformer (VT) of multiple voltage grade.During execute-in-place, first mobile trolley 10 is pushed into by the below of verification mutual inductor place wire, the line of system various piece is connected.Operator controls the landing of hoistable platform 7 a long way off by telepilot, be connected by the grading ring 1 above capacitor with a wire, then starts verification.After having verified, remote pilot hoistable platform 7, exits by capacitor from a wire.
Digital collection unit 6 is positioned at below low-field electrode 5, is attached thereto by shielded cable.Connecting fiber 9 between digital collection unit 6 and optical signal processing unit 11 has two, is respectively synchronous optical fiber and data optical fiber.Intelligent processing unit 13 controls optical signal processing unit 11 pairs of digitizing collecting units 6 and sends synchronous sampling signal, after digital collection unit 6 receives synchronizing signal, to from SF
6the signal of plane-parallel capacitor carries out high-precision synchronized sampling.
The light signal that digital collection unit 6 transmits by optical signal processing unit 11 carries out certain process, and is converted to the electric signal of applicable USB transmission line 12 transmission, transfers to intelligent processing unit 13 by USB transmission line 12.Intelligent processing unit 13 Main Function calculates to standard mutual inductor with by the data analysis of verification mutual inductor.
The utility model is a kind of based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, owing to adopting SF
6plane-parallel capacitor, as voltage sensor unit, has principle and structure is simple, volume is little, the advantage such as lightweight, is applicable to very much on-the-spot on-line testing and uses.Meanwhile, based on SF
6the standard potential transformer of plane-parallel capacitor, it is measured frequency band and wants wide many compared with conventional electromagnetic voltage transformer (VT), except can verifying the basic accuracy of voltage transformer (VT), can also carry out the verification of harmonic measure accuracy to it.
Claims (9)
1. one kind based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, comprises primary voltage sensing unit, digital collection unit (6), optical signal processing unit (11) and intelligent processing unit (13), it is characterized in that, primary voltage sensing unit adopts SF
6plane-parallel capacitor, as voltage sensor unit, obtains primary voltage signal by the electric current in Detection capacitance;
SF
6plane-parallel capacitor is provided with the air pressure monitor device (2) for gaseous tension in monitoring capacitor, primary voltage sensing unit is connected with digital collection unit (6), and digital collection unit (6) connects intelligent processing unit (13) by optical signal processing unit (11).
2. one according to claim 1 is based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, is characterized in that, described SF
6plane-parallel capacitor includes high-field electrode (3), low-field electrode (5) and insulating sleeve (4), and high-field electrode (3), low-field electrode (5) and insulating sleeve (4) form a closed, and inside is filled with SF
6insulating gas or N
2and SF
6mixed gas.
3. one according to claim 2 is based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, is characterized in that, described high-field electrode (3) top is provided with air pressure monitor device (2), grading ring (1), and high-field electrode (3) and grading ring (1) form a metal cage.
4. one according to claim 1 is based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, is characterized in that, is provided with digital collection unit (6) below primary voltage sensing unit, and digital collection unit (6) is connected with primary voltage sensing unit by shielded cable.
5. one according to claim 1 is based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, is characterized in that, described digital collection unit (6) is connected by optical fiber (9) with between optical signal processing unit (11).
6. one according to claim 1 is based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, is characterized in that, optical signal processing unit (11) connects intelligent processing unit (13) by USB transmission line (12).
7. voltage transformer (VT) on-line testing system according to claim 1, is characterized in that: primary voltage sensing unit is arranged on hoistable platform (7), and described hoistable platform (7) connects telechiric device.
8. voltage transformer (VT) on-line testing system according to claim 7, is characterized in that: hoistable platform (7) is positioned on mobile trolley (10).
9. one according to claim 1 is based on SF
6the voltage transformer (VT) on-line testing system of parallel plate capacitor, is characterized in that: intelligent processing unit (13) is desk-top computer or notebook.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420662528.0U CN204228940U (en) | 2014-11-07 | 2014-11-07 | A kind of voltage transformer (VT) on-line testing system based on SF6 parallel plate capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420662528.0U CN204228940U (en) | 2014-11-07 | 2014-11-07 | A kind of voltage transformer (VT) on-line testing system based on SF6 parallel plate capacitor |
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| Publication Number | Publication Date |
|---|---|
| CN204228940U true CN204228940U (en) | 2015-03-25 |
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|---|---|---|---|
| CN201420662528.0U Expired - Fee Related CN204228940U (en) | 2014-11-07 | 2014-11-07 | A kind of voltage transformer (VT) on-line testing system based on SF6 parallel plate capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107399A (en) * | 2018-02-26 | 2018-06-01 | 国网宁夏电力有限公司电力科学研究院 | Charged access device and transformer checking system |
| CN111751599A (en) * | 2020-07-08 | 2020-10-09 | 广东电网有限责任公司 | Movable capacitive voltage transformer device and online monitoring system |
-
2014
- 2014-11-07 CN CN201420662528.0U patent/CN204228940U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107399A (en) * | 2018-02-26 | 2018-06-01 | 国网宁夏电力有限公司电力科学研究院 | Charged access device and transformer checking system |
| CN108107399B (en) * | 2018-02-26 | 2024-04-02 | 国网宁夏电力有限公司电力科学研究院 | Electrified access device and transformer verification system |
| CN111751599A (en) * | 2020-07-08 | 2020-10-09 | 广东电网有限责任公司 | Movable capacitive voltage transformer device and online monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 Termination date: 20151107 |
|
| EXPY | Termination of patent right or utility model |