CN104793038A - All-optical overvoltage monitoring device for electric power system - Google Patents

All-optical overvoltage monitoring device for electric power system Download PDF

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Publication number
CN104793038A
CN104793038A CN201510187781.4A CN201510187781A CN104793038A CN 104793038 A CN104793038 A CN 104793038A CN 201510187781 A CN201510187781 A CN 201510187781A CN 104793038 A CN104793038 A CN 104793038A
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CN
China
Prior art keywords
signal
optical
electric field
voltage
overvoltage
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Pending
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CN201510187781.4A
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Chinese (zh)
Inventor
曾嵘
庄池杰
谢施君
汪海
李建明
张榆
陈少卿
余占清
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Tsinghua University
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Tsinghua University
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Priority to CN201510187781.4A priority Critical patent/CN104793038A/en
Publication of CN104793038A publication Critical patent/CN104793038A/en
Pending legal-status Critical Current

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Abstract

The invention relates to an all-optical overvoltage monitoring device for an electric power system and belongs to the technical field of voltage measuring. The all-optical overvoltage monitoring device comprises a laser source for transmitting laser signals, a polarizer, an optical electric field sensor, a polarization beam splitter, an optical receiver, an analog-to-digital converter, a cache, a processor and industrial personal computer. The all-optical overvoltage monitoring device has the advantages that the integrated optical electric field sensor is used, influence of the optical electric field sensor on an original electric field is small due to the fact that the optical electric field sensor contains no metal, and high measuring reliability is achieved; the device is large in frequency range and consistent in frequency response under power frequency and overvoltage frequency, so that the device can measure power frequency voltage, inner overvoltage and outer overvoltage; the device is applicable overvoltage online monitoring in the electric power system and voltage measuring during tests and debugging, and analytical data is provided to possible equipment faults.

Description

A kind of electric system full optics over-voltage monitoring device
Technical field
The present invention relates to a kind of electric system full optics over-voltage monitoring device, belong to voltage measurement technologies field.
Background technology
Superpotential causes the one of the main reasons of power grid accident, is also the deciding factor selecting insulation of electrical installation intensity.Although the superpotential duration is of short duration, because its peak value is high, waveform is steep, energy is large, serious threat can be caused to electric insulation.In electric system, there is extremely important meaning to superpotential measurement and analysis.By analyzing superpotential generation evolution, reliable data can being provided for accident settlement, providing important reference frame for proposing innovative approach.Also can provide actual effective data for Electric Manufacture simultaneously.
Such as transformer station, to 220kV and following system, the dielectric level of electrical equipment determines primarily of lightning surge; To the extra high voltage system of 330kV and above, switching overvoltage becomes principal contradiction, and Insulation Coordination needs switching overvoltage to control in certain limit, then protects in support with lightning arrester.Research and engineering staff adopt standard lightning wave, standard operation ripple to replace the actual High Voltage Impulse Waveform born of equipment, as test waveform, test.Do Insulation Coordination by the test findings of the standard switching impulse voltage of 250s/2500s and may bring two consequences: if 250s is the critical wave front time in gap really, and actual superpotential wave head is longer than 250s, adopt the test findings of standard operation ripple that the nargin of Insulation Coordination may be caused excessive, less economical; If 250s is not the critical wave front time in gap, then, under the operation ripple effect of certain wave head, the voltage breakdown in gap is lower, causes the security of Insulation Coordination to reduce.So, obtain correct over-voltage waveform, have essence meaning to the economy of Insulation Coordination and security.
The principle of what at present comparatively ripe over-voltage measurement method mainly utilized is capacitive divider.Adopt high-voltage bleeder or condenser-type terminal end shield to connect the mode of low-voltage arm voltage divider, high side voltage is converted into collectable low voltage signal.But the program is subject to the impact of the factor such as stray capacitance, inductance, cause measuring accuracy not high enough.Its upper cut-off frequency often only has a few MHz simultaneously, is difficult to the overvoltage signal that Measurement accuracy frequency is higher.
So how to obtain a large amount of measured data, obtain actual measurement over-voltage waveform feature, for the revision of the testing regulations and Insulation Coordination directive/guide that instruct power equipment, and the lifting economy of Insulation Coordination and the security of system cloud gray model have very important meaning.
Summary of the invention
The object of the invention is to propose a kind of electric system full optics over-voltage monitoring device, adopt optical electric field sensor, by measuring, quasi-static electric field is counter pushes away change in voltage situation, realizes superpotential monitoring.The present invention has bandwidth, sampling rate is high, reliability is strong feature, meets the requirement of over-voltage monitoring.
The electric system full optics over-voltage monitoring device that the present invention proposes, comprising:
Lasing light emitter, for sending laser signal;
The polarizer, for being received the laser signal that light source exports by optical fiber, and is converted into linearly polarized light by laser signal;
Optical electric field sensor, for receiving linearly polarized light by optical fiber, linearly polarized light is decomposed into the two-way polarized light signal propagated on the fast axle and slow axis of sensor crystal, and the electric field that the voltage for responding in transmission line of electricity produces, based on Pockels effect, the electric field of sensor sensing changes the refractive index propagating light in the fast axle of crystal and slow axis, two-way light is modulated, two-way light is made to produce the phase differential corresponding with electric field level, two-way light interferes at the output terminal of sensor crystal, obtain including the elliptical polarization laser of change in voltage information in transmission line of electricity,
Polarization beam apparatus, for being received the elliptical polarization laser that optical electric field sensor exports by optical fiber, and makes polarization state signal be converted into two-way light intensity signal;
Photoreceiver, for being received any road light intensity signal that polarization beam apparatus exports by optical fiber, and is converted into voltage signal by this light intensity signal;
Analog to digital converter, for being received the voltage signal of photoreceiver by radio-frequency cable, and is converted to digital signal by the analog quantity of voltage signal;
Buffer, for storing the digital voltage signal of analog to digital converter;
Processor, for the superpotential threshold value of the electric system according to setting, digital voltage signal in above-mentioned buffer is judged, if digital voltage signal is less than or equal to superpotential threshold value, then empty buffer memory, continue testing process, if digital voltage signal is greater than superpotential threshold value, then judge to create superpotential in electric system, and the corresponding data in buffer is sent in industrial computer;
Industrial computer, for storage of collected to overvoltage signal and show.
The electric system full optics over-voltage monitoring device that the present invention proposes, its advantage is:
1, in electric system of the present invention full optics over-voltage monitoring device, have employed integrated optics electric-field sensor, owing to not containing metal in optical electric field sensor, less to former electric field influence, therefore there is higher Measurement reliability.
2, the optical electric field sensor adopted in pick-up unit of the present invention, has very large frequency range, and under power frequency with superpotential frequency, frequency response is consistent, therefore can take into account the measurement of power-frequency voltage and internal overvoltage and external overvoltage.
3, measurement mechanism of the present invention, with electrical network primary equipment without direct electrical connection, Insulation Problems is little, and installation and maintenance more for convenience.
4, the present invention is except for except the superpotential on-line monitoring in electric system, can also be used for testing, over-voltage measurement in debug process.When withstand voltage test or new equipment put into operation at the scene, by the present invention, superpotential is measured, analysis data can be provided for the equipment failure that may occur.
Accompanying drawing explanation
Fig. 1 is the structural representation of the electric system full optics over-voltage monitoring device that the present invention proposes.
Fig. 2 is a using state figure of the electric system full optics over-voltage monitoring device that the present invention proposes.
In Fig. 1 and Fig. 2,1 is lasing light emitter, and 2 is polarizers, and 3 is optical fiber, and 4 is optical electric field sensors, 5 is polarization beam apparatus, and 6 is photoreceivers, and 7 is analog to digital converters, and 8 is buffers, and 9 is processors, 10 is radio-frequency cables, and 11 is industrial computers, and 12 is optical fiber insulators, and 13 is transmission lines of electricity.
Embodiment
A kind of electric system full optics over-voltage monitoring device that the present invention proposes, as shown in Figure 1, this over-voltage monitoring device comprises its structure:
Lasing light emitter 1, for sending laser signal, in one embodiment of the present of invention, the C-band flat gain ASE light source that the model of the lasing light emitter of use is Junfeng Co..
The polarizer 2, for being received the laser signal that light source exports by optical fiber 3, and is converted into linearly polarized light by laser signal;
Optical electric field sensor 4, for receiving linearly polarized light by optical fiber 3, linearly polarized light is decomposed into the two-way polarized light signal propagated on the fast axle and slow axis of sensor crystal, and in induction power system voltage produce electric field, based on Pockels effect, the electric field of sensor sensing changes the refractive index propagating light in the fast axle of crystal and slow axis, two-way light is modulated, two-way light is made to produce the phase differential corresponding with electric field level, two-way light interferes at the output terminal of sensor crystal, obtain including the elliptical polarization laser of change in voltage information in electric system.
Compared with existing over-voltage monitoring technology, the optical electric field sensor 4 adopted in over-voltage monitoring device of the present invention, adopt the integrated common path interference electric-field sensor based on Pockels effect, utilize photoelectric effect, sensor can sense power-frequency voltage when instantaneous voltage when producing superpotential and normal work.The electric field signal caused by voltage signal, is converted into light signal.The frequency range of described optical electric field sensor 4 is large, can gather power frequency component and overvoltage signal simultaneously.In embodiment, the production unit of open optical electric field sensor is Tsing-Hua University, and name is called a kind of integrated electric field sensor based on common path interference, the patent No. 201210348311.8.
Use electric system of the present invention full optics over-voltage monitoring device to when the superpotential of transmission line of electricity is monitored in electric system, first by optical electric field sensor 4, by optical fiber insulator be placed on need measure electric system transmission line of electricity near, as shown in Figure 2, make optical electric field sensor 4 and electric system primary equipment without direct electrical connection, so there is no the problem insulated.The light signal of the input and output of optical electric field sensor 4, is all transmitted by optical fiber 3.Lasing light emitter 1 and photoreceiver 6 can be placed in master-control room, therefore without the problem of electromagnetic interference (EMI) and power supply.
Polarization beam apparatus 5, for being received the elliptical polarization laser that optical electric field sensor 4 exports by optical fiber 3, and makes polarization state signal be converted into two-way light intensity signal; Because two-way light intensity signal is complementary, so any road light intensity signal all carries complete change in voltage information.
Photoreceiver 6, for being received any road light intensity signal that polarization beam apparatus 5 exports by optical fiber, and is converted into voltage signal by this light intensity signal; In one embodiment of the present of invention, the DET01CFC that the model of the photoreceiver 6 of use is Thorlabs company.
Analog to digital converter 7, for being received the voltage signal that photoreceiver 6 exports by radio-frequency cable 10, and is converted to digital signal by the analog quantity of voltage signal;
Buffer 8, for storing the digital voltage signal of analog to digital converter 7;
Processor 9, for the superpotential threshold value of the power system transmission line according to setting, digital voltage signal in above-mentioned buffer 8 is judged, if digital voltage signal is less than or equal to superpotential threshold value, then empty buffer memory, continue testing process, if digital voltage signal is greater than superpotential threshold value, then judge to create superpotential in electric system, and the corresponding data in buffer is sent in industrial computer; In one embodiment of the present of invention, the processor of use adopts the C6000 series of Texas Instruments.
Industrial computer 11, for storage of collected to overvoltage signal and show, general computing machine can be adopted as industrial computer 11.
Figure 2 shows that a using state figure of the electric system full optics over-voltage monitoring device that the present invention proposes, adopt the superpotential of transmission line of electricity in the electric system of this device monitoring, first by optical electric field sensor 4 by optical fiber insulator 12 fixed placement near transmission line of electricity 13 to be measured.By the optical fiber in optical fiber insulator, sensor input is connected with optical fiber 3 with output terminal.Described electric-field sensor 4 is placed near transmission line of electricity 13 place, and the electric jamming being subject to other two-phases is little.
Above-mentioned scheme of installation is only a kind of mounting means of optical electric field sensor of the present invention, but should not be construed the restriction of the scope of the claims of the present invention.For use those skilled in the art, can need in conjunction with measurement, adopt different means, sensor is placed on the position needing to carry out over-voltage measurement.
The present invention except for except the superpotential on-line monitoring in electric system, can also be used for testing, over-voltage measurement in debug process.When withstand voltage test or new equipment put into operation at the scene, by the present invention, superpotential is measured, analysis data can be provided for the equipment failure that may occur.

Claims (1)

1. an electric system full optics over-voltage monitoring device, is characterized in that this over-voltage monitoring device comprises:
Lasing light emitter, for sending laser signal;
The polarizer, for being received the laser signal that light source exports by optical fiber, and is converted into linearly polarized light by laser signal;
Optical electric field sensor, for receiving linearly polarized light by optical fiber, linearly polarized light is decomposed into the two-way polarized light signal propagated on the fast axle and slow axis of sensor crystal, and in induction power system voltage produce electric field, based on Pockels effect, the electric field of sensor sensing changes the refractive index propagating light in the fast axle of crystal and slow axis, two-way light is modulated, two-way light is made to produce the phase differential corresponding with electric field level, two-way light interferes at the output terminal of sensor crystal, obtain including the elliptical polarization laser of change in voltage information in electric system,
Polarization beam apparatus, for being received the elliptical polarization laser that optical electric field sensor exports by optical fiber, and makes polarization state signal be converted into two-way light intensity signal;
Photoreceiver, for being received any road light intensity signal that polarization beam apparatus exports by optical fiber, and is converted into voltage signal by this light intensity signal;
Analog to digital converter, for being received the voltage signal of photoreceiver by radio-frequency cable, and is converted to digital signal by the analog quantity of voltage signal;
Buffer, for storing the digital voltage signal of analog to digital converter;
Processor, for the superpotential threshold value of the electric system according to setting, digital voltage signal in above-mentioned buffer is judged, if digital voltage signal is less than or equal to superpotential threshold value, then empty buffer memory, continue testing process, if digital voltage signal is greater than superpotential threshold value, then judge to create superpotential in electric system, and the corresponding data in buffer is sent in industrial computer;
Industrial computer, for storage of collected to overvoltage signal and show.
CN201510187781.4A 2015-04-20 2015-04-20 All-optical overvoltage monitoring device for electric power system Pending CN104793038A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN105445530A (en) * 2015-11-27 2016-03-30 国网重庆市电力公司电力科学研究院 Non-contact optical voltage sensor used for power grid overvoltage multi-point monitoring
CN108344910A (en) * 2018-01-18 2018-07-31 珠海市飞天科技有限公司 A kind of power system monitoring equipment, system and method
CN108387787A (en) * 2018-01-16 2018-08-10 清华大学 A kind of integrated common path interference electric field measurement system for eliminating polarization correlated noise
CN112526240A (en) * 2020-11-30 2021-03-19 广东电网有限责任公司 Non-contact broadband overvoltage online monitoring device

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105445530A (en) * 2015-11-27 2016-03-30 国网重庆市电力公司电力科学研究院 Non-contact optical voltage sensor used for power grid overvoltage multi-point monitoring
CN108387787A (en) * 2018-01-16 2018-08-10 清华大学 A kind of integrated common path interference electric field measurement system for eliminating polarization correlated noise
CN108344910A (en) * 2018-01-18 2018-07-31 珠海市飞天科技有限公司 A kind of power system monitoring equipment, system and method
CN112526240A (en) * 2020-11-30 2021-03-19 广东电网有限责任公司 Non-contact broadband overvoltage online monitoring device

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Application publication date: 20150722