CN104777344A - Non-contact type overvoltage detection system on basis of electro-optic effect - Google Patents
Non-contact type overvoltage detection system on basis of electro-optic effect Download PDFInfo
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- CN104777344A CN104777344A CN201510186684.3A CN201510186684A CN104777344A CN 104777344 A CN104777344 A CN 104777344A CN 201510186684 A CN201510186684 A CN 201510186684A CN 104777344 A CN104777344 A CN 104777344A
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- 230000000694 effects Effects 0.000 title abstract description 6
- 238000001514 detection method Methods 0.000 title abstract 4
- 239000003365 glass fiber Substances 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 230000001939 inductive effect Effects 0.000 claims abstract description 13
- 230000003287 optical Effects 0.000 claims abstract description 11
- 230000001808 coupling Effects 0.000 claims abstract description 10
- 238000010168 coupling process Methods 0.000 claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000005693 optoelectronics Effects 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 230000000051 modifying Effects 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract 2
- 210000003666 Nerve Fibers, Myelinated Anatomy 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000001052 transient Effects 0.000 description 2
- 230000005697 Pockels effect Effects 0.000 description 1
- 230000003542 behavioural Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention discloses a non-contact type overvoltage detection system on the basis of an electro-optic effect. A coupling capacitor between a wire and an induction metal plate is connected in series with a fixed value capacitor to form a voltage division unit so as to realize non-contact induction of voltage; a low-voltage signal is converted into an optical signal by a photoelectric sensing unit, transmission with a local discharge unit is realized by a multimode optical fiber, a power supply does not need to supply power in the converting process and interference of the surrounding electromagnetism on signal transmission is low; optical signal receiving equipment and a laser source are positioned at a high voltage bus or an off-site pole tower; a sensor is connected with an optical signal receiving unit by a polarization maintaining optical fiber. The non-contact type overvoltage detection sensor on the basis of the primary electro-optic effect, which is disclosed by the invention, has the response characteristics of high accuracy and frequency response speed under the conditions of thunder and lightning and operation impact, can be suitable for overvoltage non-contact passive detection on various voltage grades, is visual and accurate in system measurement result and has high engineering application value.
Description
Technical field
The present invention relates to high-voltage fence over-voltage measurement field, particularly relate to the contactless Zenith tracking system based on electrooptical effect.
Background technology
Power network overvoltage is the major reason threatening transmission line of electricity and transformer station's insulation.Superpotential defence and protection are the important research directions ensureing electric power netting safe running always.Superpotential in high-voltage fence has amplitude, high-frequency feature, is difficult to direct measurement, and prior art adopts electromagnetic transient simulation to study superpotential behavioural characteristic as means, lacks the over-voltage waveform of actual measurement and the system verification of parameter.
Electrooptical effect generally refers to that medium is under the effect of electric field, and some optical characteristics of material such as refractive index there occurs the phenomenon of change.Electrooptical effect can be divided into one-level electrooptical effect and secondary electrooptical effect by the relation of voltage and variations in refractive index, in the mode of polarization, generally has again and laterally applies electric field (perpendicular to main shaft) and longitudinally apply electric field (being parallel to main shaft) two kinds of modes.Because cross electro-optical effect has, half-wave voltage is low, the good feature of the linearity, becomes an indispensable technology at HVDC converter substation to superpotential detector switch.Some crystalline solids are under the effect of external electric field, linear change can be there is in its refractive index along with the change of electric field strength, light through these crystal can produce birefringent phenomenon, phase differential between birefringence two light wave is directly proportional to electric field strength, be called an electrooptical effect, also be Pockels effect, can detect by optical device the phase place change that electric field or change in voltage cause, and then inverse out execute electric field or voltage.
Traditional Zenith tracking adopts the traditional capacitance voltage divider being used for electrical network grade, for bottom shielding of bushing voltage divider system and the circuit coupling capacitance formula non-contact voltage sensor of high pressure and supergrid.Traditional capacitive divider directly must be connected with electric system primary equipment, when electric pressure is lower, it is high that this voltage divider being parallel to primary equipment for a long time has measuring accuracy, the advantages such as transient response characteristic is good, but when electric pressure is higher, voltage divider adds additional primary equipment in system and drops into, and long-time running has larger risk.Bottom shielding of bushing voltage divider system method structure is simple, but also exist end shield ground wire broken string or sensor open circuit cause the potential threats such as end shield electric discharge, in order to avoid sensor is to the interference of primary system, a kind of non-contacting sensor of high pressure overhead power line Zenith tracking is proposed, the voltage waveform of overhead transmission line can be obtained by capacitive coupling, in order to avoid the untreated pickup electrode of long range propagation is vulnerable to electromagnetic interference (EMI), and add electro-optic conversion technology and coupling capacitance combine with technique, carry out the superpotential non-contact measurement system construction based on an electrooptical effect technology.
Summary of the invention
The present invention is achieved by the following technical solutions:
Based on the contactless Zenith tracking system of electrooptical effect, form partial pressure unit (2) by the definite value electric capacity of connect of the coupling capacitance between wire with induction sheet metal (10), the noncontact realizing voltage is responded to; Low voltage signal is converted to light signal by photoelectric sensing unit (1), and realizes transmitting with shelf depreciation unit (4) by multimode optical fiber (6), and transfer process is without the need to Power supply, and Signal transmissions is little by periphery electromagnetic interference (EMI); Light signal receiving equipment (3) and lasing light emitter are positioned at the outer shaft tower of high voltage bus or station, sensor is connected (5) by polarization maintaining optical fibre with optical signal transceiver unit, and the high-voltage signal that the partial pressure unit (2) that coupling capacitance and fixed capacity form can realize line over-voltage is converted into low-voltage signal;
The sensor one-piece construction of described photoelectric sensing unit (1) is by responding to sheet metal (10), screening can (101), optical fiber (102), insulating material (103), low pressure modular walls (104);
Described partial pressure unit (2) forms contactless Zenith tracking system line structure and is connected to oscillograph (8) by standard voltage divider (7), and induction sheet metal and electrooptical modulation are connected to oscillograph, are connected with insulation column in transmission line of electricity one end.
Further, described induction sheet metal is of a size of 0.5mx0.2m, and the spacing of wire and sheet metal is 0.16m.
Further, the voltage of described induction sheet metal does not exceed the range of linearity of photoelectric sensing unit-20 ~ 20V.
Further, collimating apparatus, optical mirror slip and electro-optic crystal are packaged in one by described photoelectric sensing unit, and install optical fiber additional at the input/output terminal of light signal, by the optical fiber at two ends or the signal transmission that is connected with other optical fiber, the long range propagation of signal can be realized easily.
The good effect that the present invention has is:
Contactless Zenith tracking system based on electrooptical effect of the present invention, the response characteristic of contactless Zenith tracking sensor under thunder and lightning and switching impulse based on an electrooptical effect proposition has higher precision and frequency response speed, the superpotential non-contact passive going for each electric pressure detects, measuring results is intuitively accurate, has higher engineer applied and is worth.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but do not form any limitation of the invention.
Fig. 1 is the contactless Zenith tracking system schematic based on electrooptical effect of the present invention.
Fig. 2 is the contactless Zenith tracking system wiring figure based on electrooptical effect of the present invention.
Fig. 3 is the contactless Zenith tracking system sensor structural representation based on electrooptical effect of the present invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, based on the contactless Zenith tracking system of electrooptical effect, form partial pressure unit 2 by the coupling capacitance definite value electric capacity of connect between wire with induction sheet metal 10, the noncontact realizing voltage is responded to; Low voltage signal is converted to light signal by photoelectric sensing unit 1, and realizes transmitting with shelf depreciation unit 4 by multimode optical fiber 6, and transfer process is without the need to Power supply, and Signal transmissions is little by periphery electromagnetic interference (EMI); Light signal receiving equipment 3 and lasing light emitter are positioned at the outer shaft tower of high voltage bus or station, sensor is connected 5 with optical signal transceiver unit by polarization maintaining optical fibre, and the high-voltage signal that the partial pressure unit 2 that coupling capacitance and fixed capacity form can realize line over-voltage is converted into low-voltage signal;
As shown in Figure 3, the sensor one-piece construction of photoelectric sensing unit 1 is by responding to sheet metal 10, screening can 101, optical fiber 102, insulating material 103, low pressure modular walls 104;
As shown in Figure 2, partial pressure unit 2 forms contactless Zenith tracking system line structure and is connected to oscillograph 8 by standard voltage divider 7, and induction sheet metal 10 is connected to oscillograph 8 with electrooptical modulation 9, is connected with insulation column 11 in transmission line of electricity one end.
Wherein, induction sheet metal 10 is of a size of 0.5mx0.2m, and the spacing of wire and sheet metal is 0.16m.
Wherein, the voltage responding to sheet metal 10 does not exceed the range of linearity of photoelectric sensing unit 1-20 ~ 20V.
Wherein, collimating apparatus, optical mirror slip and electro-optic crystal are packaged in one by photoelectric sensing unit 1, and install optical fiber additional at the input/output terminal of light signal, by the optical fiber at two ends or the signal transmission that is connected with other optical fiber, can realize the long range propagation of signal easily.
Based on the contactless Zenith tracking system of electrooptical effect, realize the sensor assembling of photoelectric sensing unit 1, light source adopts He-Ne lasing light emitter, the light that lasing light emitter sends becomes linearly polarized light after reaching the polarizer by optical fiber, under the modulation of applied voltage, when light passes through crystal, the phase differential of birefringent light changes, after analyzer, reach electric explorer through optical fiber and find out this phase place and change the light intensity change caused, and be translated into the voltage signal directly can measured with oscillograph.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1., based on the contactless Zenith tracking system of electrooptical effect, form partial pressure unit (2) by the definite value electric capacity of connect of the coupling capacitance between wire with induction sheet metal (10), the noncontact realizing voltage is responded to; Low voltage signal is converted to light signal by photoelectric sensing unit (1), and realizes transmitting with shelf depreciation unit (4) by multimode optical fiber (6), and transfer process is without the need to Power supply, and Signal transmissions is little by periphery electromagnetic interference (EMI); Light signal receiving equipment (3) and lasing light emitter are positioned at the outer shaft tower of high voltage bus or station, sensor is connected (5) by polarization maintaining optical fibre with optical signal transceiver unit, and the high-voltage signal that the partial pressure unit (2) that coupling capacitance and fixed capacity form can realize line over-voltage is converted into low-voltage signal;
The sensor one-piece construction of described photoelectric sensing unit (1) is by responding to sheet metal (10), screening can (101), optical fiber (102), insulating material (103), low pressure modular walls (104);
Described partial pressure unit (2) forms contactless Zenith tracking system line structure and is connected to oscillograph (8) by standard voltage divider (7), induction sheet metal (10) and electrooptical modulation (9) are connected to oscillograph (8), are connected with insulation column (11) in transmission line of electricity one end.
2. the contactless Zenith tracking system based on electrooptical effect according to claim 1, is characterized in that, described induction sheet metal (10) is of a size of 0.5mx0.2m, and the spacing of wire and sheet metal is 0.16m.
3. the contactless Zenith tracking system based on electrooptical effect according to claim 1, is characterized in that, the voltage of described induction sheet metal (10) does not exceed the range of linearity of photoelectric sensing unit (1)-20 ~ 20V.
4. the contactless Zenith tracking system based on electrooptical effect according to claim 1, it is characterized in that, collimating apparatus, optical mirror slip and electro-optic crystal are packaged in one by described photoelectric sensing unit (1), and install optical fiber additional at the input/output terminal of light signal, by the optical fiber at two ends or the signal transmission that is connected with other optical fiber, the long range propagation of signal can be realized easily.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510186684.3A CN104777344A (en) | 2015-04-18 | 2015-04-18 | Non-contact type overvoltage detection system on basis of electro-optic effect |
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| CN201510186684.3A CN104777344A (en) | 2015-04-18 | 2015-04-18 | Non-contact type overvoltage detection system on basis of electro-optic effect |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021901A (en) * | 2015-08-07 | 2015-11-04 | 重庆大学 | High-voltage electric field measurement system and measurement method thereof |
| CN105067865A (en) * | 2015-07-29 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | Substation full-wave voltage integrated measuring device |
| CN105388354A (en) * | 2015-11-30 | 2016-03-09 | 国网四川省电力公司电力科学研究院 | Mounting assembly for all-optical overvoltage sensor for overvoltage measurement |
| CN108387772A (en) * | 2018-03-08 | 2018-08-10 | 清华大学 | A kind of measurement method of transmission line of electricity overvoltage |
| CN110501549A (en) * | 2019-07-19 | 2019-11-26 | 武汉大学 | A kind of measurement method of tower body impact high voltage |
| CN113238093A (en) * | 2021-06-11 | 2021-08-10 | 广西电网有限责任公司电力科学研究院 | Non-contact voltage measuring method, non-contact voltage measuring device, computer equipment and storage medium |
| CN113721061A (en) * | 2021-10-09 | 2021-11-30 | 福州大学 | Non-contact wireless transmission alternating current voltage transformer based on electroluminescent device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067865A (en) * | 2015-07-29 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | Substation full-wave voltage integrated measuring device |
| CN105067865B (en) * | 2015-07-29 | 2018-03-23 | 广东电网有限责任公司电力科学研究院 | Transformer station's full wave voltage comprehensive measurement device |
| CN105021901A (en) * | 2015-08-07 | 2015-11-04 | 重庆大学 | High-voltage electric field measurement system and measurement method thereof |
| CN105388354A (en) * | 2015-11-30 | 2016-03-09 | 国网四川省电力公司电力科学研究院 | Mounting assembly for all-optical overvoltage sensor for overvoltage measurement |
| CN105388354B (en) * | 2015-11-30 | 2018-02-02 | 国网四川省电力公司电力科学研究院 | A kind of mounting assembly of full optics overvoltage sensor for over-voltage measurement |
| CN108387772A (en) * | 2018-03-08 | 2018-08-10 | 清华大学 | A kind of measurement method of transmission line of electricity overvoltage |
| CN108387772B (en) * | 2018-03-08 | 2020-02-18 | 清华大学 | Method for measuring overvoltage of power transmission line |
| CN110501549A (en) * | 2019-07-19 | 2019-11-26 | 武汉大学 | A kind of measurement method of tower body impact high voltage |
| CN113238093A (en) * | 2021-06-11 | 2021-08-10 | 广西电网有限责任公司电力科学研究院 | Non-contact voltage measuring method, non-contact voltage measuring device, computer equipment and storage medium |
| CN113721061A (en) * | 2021-10-09 | 2021-11-30 | 福州大学 | Non-contact wireless transmission alternating current voltage transformer based on electroluminescent device |
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Application publication date: 20150715 |