CN201589842U - Local discharging optical fiber detection device of transformer - Google Patents

Local discharging optical fiber detection device of transformer Download PDF

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Publication number
CN201589842U
CN201589842U CN2010203021859U CN201020302185U CN201589842U CN 201589842 U CN201589842 U CN 201589842U CN 2010203021859 U CN2010203021859 U CN 2010203021859U CN 201020302185 U CN201020302185 U CN 201020302185U CN 201589842 U CN201589842 U CN 201589842U
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China
Prior art keywords
transformer
optical fiber
optical sensor
partial discharge
fibre optical
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Expired - Lifetime
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CN2010203021859U
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Chinese (zh)
Inventor
陈玉峰
朱文兵
尹奎龙
祁海峰
马良柱
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State Grid Corp of China SGCC
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Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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Abstract

The utility model discloses a local discharging optical fiber detection device of transformer which is based on over fused-taper fiber coupled optical fiber sensor, belongs to the passive device field; and achieves the advantages of no damage to original field distribution, safe essence, no relay needing in remote detection, no preamplifier needing in long distance transmission, high sensitivity and high signal to noise ratio; is not interfered by electromagnet, can detect the ultrasonic signal generated by the local discharging of transformer, is convenient for realizing networking, multiplexing and on-line monitoring; thereby can be widely applied in oil-immersed transformer of 110KV or higher. The device mainly comprises a laser source, a transmission optical cable, an optical fiber sensor and an electrooptical signal conversion and processing apparatus; wherein the optical fiber sensor is mounted on the casing of the transformer or inside the transformer.

Description

The partial discharge of transformer optical fiber detector
Technical field
The utility model relates to the exploitation of a kind of equipment for power transmission and distribution online measuring technique and uses, and relating to a kind of field data sensing, demodulation, collection, data processing of collecting specifically is the partial discharge of transformer optical fiber detector of one.
Background technology
High-power transformer is one of most important equipment of electric system, and its situation is directly connected to the safety and economic operation of electric system.Data shows that the fault of large-scale power transformer is based on insulation fault, and shelf depreciation is the reason of insulation degradation, is again the tendency and the form of expression of insulation degradation.The detection of shelf depreciation can reflect the insulation status of transformer in advance, in time finds the insulation defect of transformer inside, and prevention latency and sudden accident take place.The method of measuring shelf depreciation mainly comprises pulse current method and supercritical ultrasonics technology, traditional pulse current method utilization detects impedance and is linked into the pulse current that comes the measuring transformer shelf depreciation to cause in the measurement loop, belong to direct measurement, highly sensitive, there is not omission in essence, but there is poor anti jamming capability, can't be to the shortcoming of partial discharge position location.Shelf depreciation all is accompanied by acoustic emission phenomenon when taking place, the frequency of acoustic emission and amplitude can reflect the level of shelf depreciation, therefore the shelf depreciation ultrasonic Method for Measuring belongs to the indirect method of measurement, traditional piezoelectric ceramic ultrasonic sensor construction is simple, highly sensitive, because the electromagnetic interference (EMI) that shelf depreciation produces is serious, the same problem that is subjected to electromagnetic interference (EMI) that exists of piezoceramic transducer, and long Distance Transmission decays easily, needs extra prime amplifier.Optical Fibre Acoustic Emission Sensor is as a kind of optical passive component, and essential safety is not subjected to electromagnetic interference (EMI), class of insulation height, and long Distance Transmission is amplified without relaying, is easy to networking and multiplexing, is suitable for the partial discharge of transformer on-line monitoring.
At the partial discharge of transformer detection range, core technology is the means based on electronics in the patent of having announced, does not retrieve the patent of measuring based on optical Fiber Method.
Summary of the invention
The purpose of this utility model is the weak point at existing piezoelectric ceramics measuring transformer shelf depreciation, a kind of partial discharge of transformer optical fiber detector is provided, this device has essential safety, be not subjected to electromagnetic interference (EMI), class of insulation height, long Distance Transmission is amplified without relaying, is easy to networking and multiplexing advantage.
For achieving the above object, the utility model adopts following technical scheme:
A kind of partial discharge of transformer optical fiber detector, it mainly comprises LASER Light Source, transmission cable, Fibre Optical Sensor, photosignal conversion and treating apparatus, wherein Fibre Optical Sensor is installed in transformer case or is installed in the transformer.
Conversion of described photosignal and treating apparatus comprise opto-electronic conversion and signal processor, it and wave filter, data acquisition card connection, and data collecting card is connected with industrial computer.
Described LASER Light Source is for producing the semiconductor DFB of C-band laser.
The optical fiber sensing probe of described Fibre Optical Sensor is encapsulated on the magnetic material by the excessive coupling mechanism of fused biconical taper and forms, and comprises into three optical cables of scene 2, pastes on the transformer case by vacuum grease.
Described one to advance three optical cables of scene 2 be that Fibre Optical Sensor advances straight-through arm of light arm, Fibre Optical Sensor and Fibre Optical Sensor coupling arm, and three intersection is the coupled zone, and the coupled zone is provided with the epoxy link.
Partial discharge of transformer optical fiber detector of the present utility model mainly comprises the C-band LASER Light Source, optical fiber sensing probe, demodulator circuit plate, data collecting card, computing machine.LASER Light Source is a semiconductor DFB, centre wavelength 1309.5nm, power 8mW, bandwidth<100pm, optical fiber sensing probe is encapsulated on the magnetic material by the excessive coupling mechanism of fused biconical taper and forms, comprise into three optical cables of scene 2, pasting the ultrasonic signal that makes transformer partial discharge produce on the transformer case by vacuum grease passes on the sensor fully, the light that light source sends enters sensor through 1 port, be divided into two photodetectors that two-way send the demodulator circuit plate through sensor then, the light that has carried heat transfer agent converts electric signal to through photodetector and carries out the simulation trial processing, finish AD conversion and computing machine communication by data collecting card behind amplification and active power filtering, software is finished the task of on-line monitoring, comprises spectrum analysis, data-triggered, historical query or the like.The big and similar industry standard of reference in view of the high frequency sound wave decay, this device bandwidth is 20-250KHz.
The course of work of this device: when the inner generation of transformer shelf depreciation, must be accompanied by acoustic emission phenomenon, it is ultrasonic on the Fibre Optical Sensor that passes to by transformer oil on the transformer case that acoustic emission produces, concerning Fibre Optical Sensor, sound wave is propagated the variation that the stress field that causes can cause medium refraction index in medium.When outside sound field acts on the sensors coupled district, can inspire inner sound wave by the epoxy link in the coupled zone, this sound wave is propagated along the coupled zone and is caused the disturbance of strain field along the coupled zone.The tapered zone of sensor plays the effect of strain concentrating, is exaggerated in the effect of eel-like figure district incident acoustic wave.Incident acoustic wave is propagated the dynamic strain field that causes makes coupled zone refractive index and effective coupling length change under photoelastic effect and mechanical effect, cause coupling coefficient C (z) and the effectively variation of coupling length l, disturbance causes the variation of sensors coupled arm and straight-through arm Output optical power, the information of magnitude of acoustic waves and frequency has been carried in the variation of luminous power, and two arm variation tendencies are opposite.Demodulator circuit carries out opto-electronic conversion and signal operation, sends signal to data collecting card behind active power filtering, and data collecting card is by USB interface and computing machine communication, and corresponding software is finished the work that final waveform demonstration and spectrum transformation, triggering are preserved.
Description of drawings
Fig. 1. the structural representation of this device;
Fig. 2. optical fibre sensor structure figure;
Fig. 3. Fibre Optical Sensor normalization output spectrum when applying 110 μ ε (intermittent line) and 220 μ ε (some intermittent line);
Fig. 4. ultrasonic signal waveform and the spectrogram that causes put in the office that this device records.
Wherein, 1 semiconductor DFB, 2 transmission cables, 3 Fibre Optical Sensors, 4 transformers, 5 epoxy links, 6 opto-electronic conversion and signal processor, 7 wave filters, 8 data collecting cards, 9 industrial computers, 10 Fibre Optical Sensors advance the light arm, 11 coupled zones, 12 Fibre Optical Sensors lead directly to arm, 13 Fibre Optical Sensor coupling arms.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is further specified.
As shown in Figure 1, it mainly comprises LASER Light Source, transmission cable 2, Fibre Optical Sensor 3, photosignal conversion and treating apparatus, and wherein Fibre Optical Sensor 3 is installed on the transformer case.
Photosignal conversion and treating apparatus comprise opto-electronic conversion and signal processor 6, and it is connected with wave filter 7, data collecting card 8, and data collecting card 8 is connected with industrial computer 9.
LASER Light Source is for producing the semiconductor DFB 1 of C-band laser.
Among Fig. 2, the optical fiber sensing probe of Fibre Optical Sensor 3 is encapsulated on the magnetic material by the excessive coupling mechanism of fused biconical taper and forms, and comprises into three optical cables of scene 2, pastes on the transformer case by vacuum grease.One to advance three optical cables of scene 2 be that Fibre Optical Sensor advances straight-through arm 12 of light arm 10, Fibre Optical Sensor and Fibre Optical Sensor coupling arm 13, and three intersection is coupled zone 11, and coupled zone 11 is provided with epoxy link 5.
Fig. 3 is Fibre Optical Sensor normalization output spectrum when applying 110 μ ε (intermittent line) and 220 μ ε (some intermittent line), wherein, normalization spectrogram when the intermittent line representative applies 110 μ ε to sensor, normalization output spectrum figure when the representative of some intermittent line applies 220 μ ε to sensor, X-axis is represented wavelength, unit is nm, and Y-axis is represented transmissivity, and unit is dB.
X-axis is the time among Fig. 4, and unit is every lattice 50ms, and Y-axis is a voltage, and the every lattice of unit are 20mV.
In the utility model, the light that C-band semiconductor DFB 1 is sent enters transmission cable 2 through built-in optoisolator, the Fibre Optical Sensor that arrives Fibre Optical Sensor 3 advances light arm 10, Fibre Optical Sensor 3 sticks on above the shell of transformer 4 by vacuum grease, through entering opto-electronic conversion and signal processor 6 (being (FBG) demodulator) through straight-through arm 12 of Fibre Optical Sensor and Fibre Optical Sensor coupling arm 13 two-way from transmission cable 2 behind the Fibre Optical Sensor 3, carry out opto-electronic conversion and signal Processing in (FBG) demodulator inside, amplify and obtain V1, V2, the mimic channel computing unit is to V1, V2 calculates signal voltage value V according to formula (1).
V = G V 1 - V 2 V 1 + V 2 + V offset - - - ( 1 )
Wherein G is amplifier gain, the simulation division computing can be eliminated because the intensity of light source rises and falls and the circuit junction loss to the influence of final signal, V OffsetBe the back level dc shift adjustment of amplifier, V OffsetDrift adjustment can be eliminated the different sensors loss neatly under the undersaturated situation of opto-electronic conversion difference causes the inconsistent influence of system sensitivity, this signal obtains the final stage output signal send active 20-250khz bandpass filter 7 after amplifying after, gathers through data collecting card 8 and send industrial computer 9 to show by software.
Test findings:
This device is carried out the Partial Discharge Detection experiment on breadboard transformer analog platform, the shelf depreciation of transformer is monitored by pulsed Partial discharge detector simultaneously, utilize the Partial Discharge Sources in the ball plate creeping discharge modeling transformer oil, signal that this device records and frequency spectrum are as shown in Figure 4.Test result shows that this device has high consistance with the measurement result of pulse current PD meter, and this illustrates that this device can satisfy the requirement of partial discharge of transformer on-line monitoring.
Supercritical ultrasonics technology measuring transformer shelf depreciation based on piezoelectric ceramics is subjected to electromagnetic interference effect heavier, and can not put into transformer inside such as winding or iron core etc., because quartz is good electrical insulator, Fibre Optical Sensor can be put into the inner appropriate location of transformer to realize accurate measurement.

Claims (5)

1. a partial discharge of transformer optical fiber detector is characterized in that, it mainly comprises LASER Light Source, transmission cable, Fibre Optical Sensor, photosignal conversion and treating apparatus, and wherein Fibre Optical Sensor is installed in transformer case or is installed in the transformer.
2. partial discharge of transformer optical fiber detector as claimed in claim 1 is characterized in that, conversion of described photosignal and treating apparatus comprise opto-electronic conversion and signal processor, it and wave filter, data acquisition card connection, and data collecting card is connected with industrial computer.
3. partial discharge of transformer optical fiber detector as claimed in claim 1 is characterized in that, described LASER Light Source is for producing the semiconductor DFB of C-band laser.
4. partial discharge of transformer optical fiber detector as claimed in claim 1, it is characterized in that, the optical fiber sensing probe of described Fibre Optical Sensor is encapsulated on the magnetic material by the excessive coupling mechanism of fused biconical taper and forms, and comprises into three optical cables of scene 2, pastes on the transformer case by vacuum grease.
5. partial discharge of transformer optical fiber detector as claimed in claim 4, it is characterized in that, described one to advance three optical cables of scene 2 be that Fibre Optical Sensor advances straight-through arm of light arm, Fibre Optical Sensor and Fibre Optical Sensor coupling arm, and three intersection is the coupled zone, and the coupled zone is provided with the epoxy link.
CN2010203021859U 2010-02-03 2010-02-03 Local discharging optical fiber detection device of transformer Expired - Lifetime CN201589842U (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141543A (en) * 2010-12-28 2011-08-03 天津大学 Method and device for detecting quality of laser welding based on microphone arrays
CN102621458A (en) * 2012-03-20 2012-08-01 上海市电力公司 Cable partial discharge detecting system
CN103364695A (en) * 2013-06-26 2013-10-23 苏州光格设备有限公司 Local discharging on-line monitoring device of high-voltage cable
CN103472136A (en) * 2013-08-30 2013-12-25 南京航空航天大学 Acoustic emission sensing system based on single mode fiber coupler
CN103941164A (en) * 2014-04-10 2014-07-23 江苏骏龙电力科技股份有限公司 Portable intelligent dual-purpose electronic device for partial discharge and on-line monitoring of transformer
CN104685366A (en) * 2012-10-05 2015-06-03 普睿司曼股份公司 Partial discharge detection system and method with synchronization
CN105044568A (en) * 2015-06-30 2015-11-11 山东微感光电子有限公司 Optical fiber ultrasonic detection system and detection method with self-adaptive transformer partial discharge
CN105137302A (en) * 2015-09-11 2015-12-09 四川菲博斯科技有限责任公司 Transformer partial discharge on-line monitoring system based on optical fiber
CN106098195A (en) * 2016-06-20 2016-11-09 山东锦安电气有限公司 A kind of brand-new dry type compound inslation bushing assembly
CN108414906A (en) * 2018-04-16 2018-08-17 国网上海市电力公司 The system and method for partial discharge of transformer is detected using Mach-Zehnder fiber optic interferometrics
CN108594086A (en) * 2018-04-13 2018-09-28 国网上海市电力公司 All -fiber Michelson inside transformers shelf depreciation ultrasonic signal detecting system and method
CN109342907A (en) * 2018-12-13 2019-02-15 武汉理工大学 The optical fibre sensor structure and demodulation method and monitoring method of partial discharge of transformer
CN110031734A (en) * 2019-05-10 2019-07-19 华北电力大学(保定) A kind of transformer optical fiber detector

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141543A (en) * 2010-12-28 2011-08-03 天津大学 Method and device for detecting quality of laser welding based on microphone arrays
CN102141543B (en) * 2010-12-28 2012-10-24 天津大学 Method and device for detecting quality of laser welding based on microphone arrays
CN102621458A (en) * 2012-03-20 2012-08-01 上海市电力公司 Cable partial discharge detecting system
CN104685366A (en) * 2012-10-05 2015-06-03 普睿司曼股份公司 Partial discharge detection system and method with synchronization
CN103364695A (en) * 2013-06-26 2013-10-23 苏州光格设备有限公司 Local discharging on-line monitoring device of high-voltage cable
CN103472136A (en) * 2013-08-30 2013-12-25 南京航空航天大学 Acoustic emission sensing system based on single mode fiber coupler
CN103941164A (en) * 2014-04-10 2014-07-23 江苏骏龙电力科技股份有限公司 Portable intelligent dual-purpose electronic device for partial discharge and on-line monitoring of transformer
CN105044568A (en) * 2015-06-30 2015-11-11 山东微感光电子有限公司 Optical fiber ultrasonic detection system and detection method with self-adaptive transformer partial discharge
CN105137302A (en) * 2015-09-11 2015-12-09 四川菲博斯科技有限责任公司 Transformer partial discharge on-line monitoring system based on optical fiber
CN106098195A (en) * 2016-06-20 2016-11-09 山东锦安电气有限公司 A kind of brand-new dry type compound inslation bushing assembly
CN108594086A (en) * 2018-04-13 2018-09-28 国网上海市电力公司 All -fiber Michelson inside transformers shelf depreciation ultrasonic signal detecting system and method
CN108414906A (en) * 2018-04-16 2018-08-17 国网上海市电力公司 The system and method for partial discharge of transformer is detected using Mach-Zehnder fiber optic interferometrics
CN109342907A (en) * 2018-12-13 2019-02-15 武汉理工大学 The optical fibre sensor structure and demodulation method and monitoring method of partial discharge of transformer
CN110031734A (en) * 2019-05-10 2019-07-19 华北电力大学(保定) A kind of transformer optical fiber detector

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Effective date of registration: 20130314

Address after: 250002 Ji'nan City Central District, Shandong, No. 2 South Road, No. 500

Patentee after: Shandong Research Inst. of Electric Power

Patentee after: State Grid Corporation of China

Address before: 250002 Ji'nan City Central District, Shandong, No. 2 South Road, No. 500

Patentee before: Shandong Research Inst. of Electric Power

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Owner name: STATE ELECTRIC NET CROP.

Effective date: 20130314

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Granted publication date: 20100922