CN105445521A - Optical voltage transformer - Google Patents
Optical voltage transformer Download PDFInfo
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- CN105445521A CN105445521A CN201410419943.8A CN201410419943A CN105445521A CN 105445521 A CN105445521 A CN 105445521A CN 201410419943 A CN201410419943 A CN 201410419943A CN 105445521 A CN105445521 A CN 105445521A
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Abstract
The invention discloses an optical voltage transformer comprising a voltage-current converter, an optical low-current sensor, and a protection gap. The voltage-current converter is implemented by a high-voltage capacitor and converts primary high voltage into low current. The optical low-current sensor is implemented by a magneto-optic glass optical current transformer and is formed by a magneto-optic glass primary sensor, a transmission optical cable, and an acquisition unit. The magneto-optic glass primary sensor is a magneto-optic glass sensing probe disposed in a solenoid and induces the low current output by the voltage-current converter by means of a Faraday magneto-optic effect. The transmission optical cable is connected with the magneto-optic glass primary sensor and the acquisition unit. The acquisition unit is arranged in a master control chamber or an outdoor cabinet, demodulates a low-current signal induced by a magneto-optic glass optical current transformer optical path system, and outputs a digital signal, indicative of primary voltage, to be used by a relay protection device and a metering device.
Description
Technical field
The present invention relates to a kind of optical voltage transformer for AC Substation, particularly relate to a kind of high pressure optical voltage transformer (VT) strong for the anti-electromagnetic interference capability of Intelligent transformer station.
Background technology
Voltage transformer (VT) be monitoring operation states of electric power system visual plant, in transformer station measure, monitoring and protecting control device rely on it obtain measurements, metering, protect needed for information of voltage.
At present, electric system mainly adopts the traditional measurement of induction voltage transformer (VT) realization to voltage signal.What require along with the raising of voltage class of electric power system and the increase of capacity and measurement and protection improves constantly, and the deficiency of electromagnetic transformer becomes increasingly conspicuous, and the subject matter of existence comprises:
(1) along with the increase of electric pressure, traditional voltage transformer (VT) volume and weight is multiplied, insulation system complicated, and cost increases;
(2) electromagnetic potential transformer is with telefault and ferromagnetic material, and frequency band is wide not, the range of linearity is narrow, mutual inductor iron core nonserviceable under saturatedly limit its dynamic response precision;
(3) transient signal produced may cause the misoperation of fast protector part.The divide-shut brake of mutual inductor can produce voltage oscillation, causes the permanent damage of vacuum switch, and the whole measurement mechanism of voltage transformer (VT) exists the danger of second short circuit;
(4) may ferroresonance be produced, occur that superpotential jeopardizes the security of operation of electrical equipment.
(5) output signal can not directly and Microcomputer measures and proterctive equipment direct interface.
Summary of the invention
Object of the present invention, is to provide a kind of that can solve current voltage transformer (VT) shortcoming, that anti-electromagnetic interference capability is strong optical voltage transformer.
In order to reach above-mentioned purpose, the invention provides following technical scheme: a kind of optical voltage transformer, is characterized in that, comprising voltage current adapter (1), optics small electric current sensor (2) and portable protective gaps (3); Voltage current adapter (1) is realized by high-voltage capacitor, converts a high voltage to small area analysis; Optics small electric current sensor (2) is realized by magneto-optic glass formula optical current mutual inductor, is specifically made up of magneto-optic glass formula primary transducer (4), transmission cable (5) and collecting unit (6) three part; Its magneto-optic glass formula primary transducer (4) is the magneto-optic glass sensing head (9) being placed in solenoid (8), the small area analysis exported by Faraday magneto-optic effect induced voltage current converter (1); Transmission cable (5) connects described magneto-optic glass formula primary transducer (4) and collecting unit (6); Collecting unit (6) is positioned at master-control room or outdoor cabinet, complete the demodulation of the small area analysis signal that magneto-optic glass formula optical current mutual inductor light path system senses, and the digital signal of output true reflection primary voltage is for protective relaying device and measuring instrument; Portable protective gaps (3) is in parallel with magneto-optic glass sensing head (9) solenoid outward (8).
In such scheme, described magneto-optic glass formula primary transducer (4), its structure is: the wire (7) of connecting with voltage current adapter (1) i.e. high-voltage capacitor is wound in cylinder (10) and forms solenoid (8) outward, magneto-optic glass sensing head (9) is placed in cylinder (10), is positioned at the positive middle part of solenoid (8).
In such scheme, in the magneto-optic glass sensing head (9) of described magneto-optic glass formula primary transducer (4), magneto-optic glass (20) has Verdet constants; And the wire number of turn of described solenoid (8) is no more than 100 circles.
In such scheme, described portable protective gaps (3) is in parallel with magneto-optic glass sensing head (9) solenoid outward (8), be made up of two tip of a root end metal bars, an output terminal being connected on voltage current adapter, another root ground connection, two metal bars are relatively most advanced and sophisticated, and there is gap centre; Gap discharge threshold is 1800 ~ 2000V.
In such scheme, described collecting unit (6) comprises wideband light source (11), wide-band coupler (12), the polarizer (13), phase-modulator (14) and photodetector (15), also comprises light source driving circuit (16), modulating and demodulating signal circuit (17) and signal sending circuit (18).
In such scheme, the external insulation of described high-voltage capacitor adopts composite insulator.
Beneficial effect of the present invention is:
1, high-voltage capacitor is stable and reliable for performance, and the external insulation realizing the high-voltage capacitor of voltage current adapter adopts composite insulator, and volume is little, lightweight, safety, and cost can not be multiplied because electric pressure increases.
2, once hold and only have high-voltage capacitor and optical sensor, without other electronic circuit, neighbouring strong electromagnetic is on it substantially without impact, and reliability is higher.Once hold iron-core-free, eliminate magnetic saturation and ferroresonance, secondary side can short circuit, and security is good.
3, can directly export the digital signal meeting IEC standard, convenient and Microcomputer measures and proterctive equipment direct interface.
4, there is not magnetically saturated problem in optics small electric current sensor, and thus optical voltage transformer static amount measures transient state measurement all higher measuring accuracy, and frequency response range is wide, can measure transient and harmonic wave in electric system exactly.
5, adopt structure simple portable protective gaps can avoid because of during imperfect earth or lightning impulse time high voltage be applied to the danger at coil or solenoid two ends, one-piece construction is safe and reliable.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical voltage transformer in the present invention;
Fig. 2 is magneto-optic glass formula primary transducer 4 structural representation in the present invention;
Fig. 3 is magneto-optic glass formula Structure of Optical Current Transducer schematic diagram in the present invention.
In figure: 1. voltage current adapter 2. optics small electric current sensor 3. portable protective gaps 4. magneto-optic glass formula primary transducer 5. transmission cable 6. collecting unit 7. wire 8. solenoid 9. magneto-optic glass sensing head 10. cylinder 11. wideband light source 12. wide-band coupler 13. polarizer 14. phase-modulator 15. photodetector 16. light source driving circuit 17. modulating and demodulating signal circuit 18. signal sending circuit 19. wave plate 20. magneto-optic glass 21. catoptron
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
Optical voltage transformer of the present invention is made up of voltage current adapter 1, optics small electric current sensor 2 and portable protective gaps 3 three part.Described voltage current adapter 1 is realized by high-voltage capacitor, converts a high voltage to small area analysis; Optics small electric current sensor 2 is realized by magneto-optic glass formula optical current mutual inductor, is made up of magneto-optic glass formula primary transducer 4, transmission cable 5 and collecting unit 6 three part; The small area analysis that its magneto-optic glass formula primary transducer 4 induced voltage current converter 1 exports, transmission cable 5 connects described magneto-optic glass formula primary transducer 4 and collecting unit 6, collecting unit 6 is positioned at master-control room or outdoor cabinet, complete the demodulation of the small area analysis signal that magneto-optic glass formula optical current mutual inductor light path system senses, and the digital signal of output true reflection primary voltage is for protective relaying device and measuring instrument; Magneto-optic glass formula primary transducer 4 is the magneto-optic glass sensing heads 9 being placed in solenoid 8; Described portable protective gaps 3 is in parallel with the solenoid 8 outside magneto-optic glass sensing head 9.As shown in Figure 1.
Primary voltage is applied on described voltage current adapter 1, its output current is directly proportional to the voltage be applied thereto, voltage current adapter 1 output current flows through the solenoid 8 of wire 7 and described magneto-optic glass formula primary transducer 4, in it, magneto-optic glass sensing head 9 responds to the magnetic field that in solenoid 8, small area analysis produces, thus record electric current in wire 7, also namely measure primary voltage.
In the present invention, magneto-optic glass formula optical current mutual inductor adopts magneto-optic glass as Faraday magneto-optic memory technique.The external insulation of the high-voltage capacitor of described voltage current adapter 1 adopts composite insulator; Described magneto-optic glass formula primary transducer 4 is in the insulator foot of voltage current adapter 1 or other low pressure end.
Described magneto-optic glass formula primary transducer 4 as shown in Figure 2.Wire 7 is wound in cylinder 10 outer formation solenoid 8, magneto-optic glass sensing head 9 is placed in cylinder 10, be positioned at the positive middle part of solenoid 8, now solenoid 8 internal magnetic field direction is parallel with the transmission direction of light in magneto-optic glass sensing head 9, and magnetic field, magneto-optic glass present position the most evenly, the Faraday magneto-optic effect effect to wherein transmission light of stable and magnetic field is the strongest.
In described magneto-optic glass sensing head 9, magneto-optic glass has Verdet constants, can be diamagnetism glass material as materials such as ZF7, SF6 glass, also can be doping Tb
3+the paramagnetism glass material had compared with Verdet constants.Cylinder 10 adopts insulating material, the plastic or other material of optional epoxy resin, glass or stable performance.Portable protective gaps 3 is in parallel with the solenoid 8 outside magneto-optic glass sensing head 9, is made up of two tip of a root end metal bars, an output terminal being connected on voltage current adapter, another root ground connection, and two metal bars are relatively most advanced and sophisticated, and there is gap centre.Gap discharge threshold is 1800 ~ 2000V, when can prevent from occurring imperfect earth in optical voltage transformer operational process or lightning impulse time primary side high pressure can be applied on magneto-optic glass formula primary transducer 4, jeopardize personnel and device security.
Described optics small electric current sensor 2 light channel structure as shown in Figure 3, is made up of collecting unit 6, Transmission Fibers 5 and magneto-optic glass sensing head 9.
The collecting unit 6 of optics small electric current sensor 2 comprises: the light path systems such as wideband light source 14, wide-band coupler 15, the polarizer 16, phase-modulator 17 and photodetector 18, also comprises light source driving circuit 19, modulation-demodulation circuit 20 and the electronic circuit such as communication and signal sending circuit 21; Its magneto-optic glass sensing head 9 is made up of wave plate 19, magneto-optic glass 20 and catoptron 21, wherein wave plate 19 and magneto-optic glass 20 precise alignment are located rear with mating glue bond, magneto-optic glass forms catoptron 21 away from the tail end plating high-reflecting film of wave plate, and high-reflecting film is corresponding with the wideband light source wavelength of collecting unit 6.Described wave plate 19 can adopt optical crystal wave plate, also can adopt optical-fibre wave plate.
To the optics small electric current sensor scheme that the present invention adopts magneto-optic glass formula optical current mutual inductor to realize, solenoid wire is wound around the number of turn and is no more than 100 circles, be wound around the wire number of turn by this standard configuration solenoid, optical voltage transformer measuring accuracy and frequency response can be taken into account.
Visible optical voltage transformer volume of the present invention is little, lightweight, environmental protection, and measuring accuracy is high, and frequency response range is wide, and transient characterisitics are good.Adding portable protective gaps makes it there is not safety problem because imperfect earth causes.Primary transducer adopts optical principle to realize, and antijamming capability is strong.
Above content is in conjunction with concrete embodiment further description made for the present invention, can not assert that specific embodiment of the invention is only limited to these and illustrates or limit protection scope of the present invention with this.Every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (6)
1. an optical voltage transformer, is characterized in that, comprises voltage current adapter (1), optics small electric current sensor (2) and portable protective gaps (3); Voltage current adapter (1) is realized by high-voltage capacitor, converts a high voltage to small area analysis; Optics small electric current sensor (2) is realized by magneto-optic glass formula optical current mutual inductor, is specifically made up of magneto-optic glass formula primary transducer (4), transmission cable (5) and collecting unit (6) three part; Its magneto-optic glass formula primary transducer (4) is the magneto-optic glass sensing head (9) being placed in solenoid (8), the small area analysis exported by Faraday magneto-optic effect induced voltage current converter (1); Transmission cable (5) connects described magneto-optic glass formula primary transducer (4) and collecting unit (6); Collecting unit (6) is positioned at master-control room or outdoor cabinet, complete the demodulation of the small area analysis signal that magneto-optic glass formula optical current mutual inductor light path system senses, and the digital signal of output true reflection primary voltage is for protective relaying device and measuring instrument; Portable protective gaps (3) is in parallel with magneto-optic glass sensing head (9) solenoid outward (8).
2. a kind of optical voltage transformer as claimed in claim 1, it is characterized in that, described magneto-optic glass formula primary transducer (4), its structure is: the wire (7) of connecting with voltage current adapter (1) i.e. high-voltage capacitor is wound in cylinder (10) and forms solenoid (8) outward, magneto-optic glass sensing head (9) is placed in cylinder (10), is positioned at the positive middle part of solenoid (8).
3. a kind of optical voltage transformer as claimed in claim 2, is characterized in that, in the magneto-optic glass sensing head (9) of described magneto-optic glass formula primary transducer (4), magneto-optic glass (20) has Verdet constants; And the wire number of turn of described solenoid (8) is no more than 100 circles.
4. a kind of optical voltage transformer as claimed in claim 1, it is characterized in that, described portable protective gaps (3) is in parallel with magneto-optic glass sensing head (9) solenoid outward (8), be made up of two tip of a root end metal bars, an output terminal being connected on voltage current adapter, another root ground connection, two metal bars are relatively most advanced and sophisticated, and there is gap centre; Gap discharge threshold is 1800 ~ 2000V.
5. a kind of optical voltage transformer as claimed in claim 1, it is characterized in that, described collecting unit (6) comprises wideband light source (11), wide-band coupler (12), the polarizer (13), phase-modulator (14) and photodetector (15), also comprises light source driving circuit (16), modulating and demodulating signal circuit (17) and signal sending circuit (18).
6. a kind of optical voltage transformer as claimed in claim 1, is characterized in that, the external insulation of described high-voltage capacitor adopts composite insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410419943.8A CN105445521A (en) | 2014-08-22 | 2014-08-22 | Optical voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410419943.8A CN105445521A (en) | 2014-08-22 | 2014-08-22 | Optical voltage transformer |
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| Publication Number | Publication Date |
|---|---|
| CN105445521A true CN105445521A (en) | 2016-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410419943.8A Pending CN105445521A (en) | 2014-08-22 | 2014-08-22 | Optical voltage transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254616A (en) * | 2018-03-26 | 2018-07-06 | 南京曦光信息科技有限公司 | A kind of solenoid type optics small electric current sensor with temperature-compensating |
| CN108828493A (en) * | 2018-06-21 | 2018-11-16 | 清华大学 | The method that elimination temperature and other phase electric fields influence optical voltage transformer precision |
| CN111753450A (en) * | 2020-06-19 | 2020-10-09 | 国网浙江省电力有限公司营销服务中心 | Optical current sensor optimization design method |
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| EP0729033A2 (en) * | 1995-02-21 | 1996-08-28 | Hitachi, Ltd. | Optical current transformer |
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2014
- 2014-08-22 CN CN201410419943.8A patent/CN105445521A/en active Pending
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| CN103197114A (en) * | 2013-01-10 | 2013-07-10 | 北京航空航天大学 | Novel reflection type reciprocity optical voltage mutual inductor and optical path design method thereof |
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| 曹志辉: ""高中压新型电子式电压互感器的研究与设计"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254616A (en) * | 2018-03-26 | 2018-07-06 | 南京曦光信息科技有限公司 | A kind of solenoid type optics small electric current sensor with temperature-compensating |
| CN108828493A (en) * | 2018-06-21 | 2018-11-16 | 清华大学 | The method that elimination temperature and other phase electric fields influence optical voltage transformer precision |
| CN111753450A (en) * | 2020-06-19 | 2020-10-09 | 国网浙江省电力有限公司营销服务中心 | Optical current sensor optimization design method |
| CN111753450B (en) * | 2020-06-19 | 2023-09-22 | 国网浙江省电力有限公司营销服务中心 | Optimal design method for optical current sensor |
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Application publication date: 20160330 |