CN204086459U - A kind of partial discharge photoelectric detection system based on laser diode - Google Patents
A kind of partial discharge photoelectric detection system based on laser diode Download PDFInfo
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- CN204086459U CN204086459U CN201420402664.6U CN201420402664U CN204086459U CN 204086459 U CN204086459 U CN 204086459U CN 201420402664 U CN201420402664 U CN 201420402664U CN 204086459 U CN204086459 U CN 204086459U
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- laser diode
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Abstract
The utility model relates to partial discharge monitoring technical field, and particularly a kind of partial discharge photoelectric detection system based on laser diode, comprises photoelectric measurement module, Optical Fiber Transmission, photoelectric conversion device, data collector; Photoelectric measurement module is placed in sample high-pressure side, office's discharge stream flows through pigtailed laser diode by the sampling resistor dividing potential drop of suitable size, voltage dependent resistor (VDR), two-way twin zener dioder, protective resistance composition protective loop prevents diode big current from damaging, and laser diode sends the light of varying strength according to office's discharge stream size; Photoelectric measurement module exports to be transmitted by optical fiber; The light signal of Optical Fiber Transmission is converted to electric signal by photoelectric conversion device, outputs to data collector.The utility model can effectively measure local discharge of electrical equipment electric current, adopts laser diode, and launched power is large, and modulating speed is high, and reaction velocity is fast, intuitive measurement results, and can effectively avoid electromagnetic interference (EMI) and grounding interference.
Description
Technical field
The utility model relates to partial discharge monitoring technical field, particularly relates to a kind of partial discharge photoelectric detection system based on laser diode.
Background technology
High voltage electric equipment in electric system, inevitably there will be certain insulation defect in long-term operational process, and shelf depreciation has become the major reason causing apparatus insulated deterioration.Insulation of electrical installation is inner normal exists some weakness, and insulation defect under applied voltage effect, first discharges, the shelf depreciation of Here it is electrical equipment.Although the energy of electric discharge is very faint, does not affect the dielectric strength in short-term of equipment, accumulate over a long period and will cause insulation ag(e)ing, whole insulation finally may be caused to puncture under normal voltage, accidents caused.The shelf depreciation of periodic detection equipment can Timeliness coverage potential safety hazard, ensures safe operation.Nearly recent decades, more and more pay attention to both at home and abroad carrying out measurement of partial discharge to equipment.
Existing detection method for local discharge is mainly divided into measures electric signal and non-electrical signal two class, the phenomenons such as the electric pulse produced during so that shelf depreciation to occur, electromagnetic radiation, ultrasound wave are for foundation, corresponding detection method comprises pulse current method, ultrasonic Detection Method, Infrared Detection Method, ultra-high-frequency detection method etc., the measuring method of non-electrical accurately cannot judge the size of discharge capacity, not intuitively.
Pulse current detection method, by detecting impedance or current sensor, the pulse current that checkout equipment causes due to shelf depreciation, obtains Apparent discharge magnitude.Be widely used in its research Partial Discharge Detection the earliest, in early days, to this, IEC has the standard of tailor.But the method frequency is low, frequency band is narrow, cannot meet the measurement under HF voltage, the quantity of information of acquisition is less and be easily subject to extraneous spatial electromagnetic disturbing effect.
Ultrasonic Detection Method is that ultrasonic probe is fixed on device outer surface, accepts the ultrasonic signal that inner shelf depreciation produces, judges the size of shelf depreciation with this.Ultrasonic Detection Method can hide the impact of electromagnetic interference (EMI), is easy to realize on-line checkingi, easy and simple to handle, is easy to carry.But current ultrasonic sensor sensibility is lower, not easily obtains useful signal at the scene, acoustical signal disturbing factor is more.Ultrasonic Detection is mainly used in the presence or absence qualitatively judging Partial discharge signal, is main subsidiary means, belongs to the measurement means of non-electrical.
Infrared Detection Method is the principle raised based on shelf depreciation point place temperature, utilizes the thermal imaging principle of infrared detecting set to record point of discharge.Due to the complicacy of equipment inner structure and diabatic process, utilizing the shelf depreciation of Infrared Detection Method direct-detection device interior to there is certain difficulty, at present mainly for the fault detect in device external, is the measuring method of non-electrical.
Ultra-high-frequency detection method is a kind of newer detection means, and the ultrahigh frequency electromagnetic signal produced by ultra-high frequency antenna accepting device shelf depreciation, realizes the measurement of shelf depreciation.The major defect of this detection method to determine discharge capacity, even if authorities put a little in the constant situation of travel path between sensor, the signal amplitude that ultrahigh frequency method is surveyed and the Apparent discharge magnitude that pulse current method records do not have clear and definite linear corresponding relation yet, increasing the difficulty that adopting said method carries out partial discharge quantity demarcation, is the measurement means of non-electrical.
The light emitting diode (LED) that laser diode (LD) in photoelectric measurement module used in similar measuring method has some obvious advantages.LED exports as incoherent light, and its spectrum width is wide, and launched power is little, and modulation rate is low; LD is that coherent light exports, and spectrum width is narrow, and launched power is large, and modulating speed is high, is suitable for and long distance two-forty system.For partial discharge detecting system, response speed is an important parameter index, the fast response time of LD, ps level can be reached, coupling efficiency is high simultaneously, and can directly modulate, the advantages such as coherence is good can meet the measuring and analysis of ns level shelf depreciation.
Summary of the invention
The purpose of this utility model proposes a kind of partial discharge photoelectric detection system based on laser diode, detect at sample high-pressure side, isolated ground interference is disturbed with spatial electromagnetic, and fast response time, the photodetector system based on LD can obtain the Partial discharge signal of high strength.
Based on a partial discharge detecting system for laser diode, comprise photoelectric measurement module, optical fiber, photoelectric conversion device and data collector, it is characterized in that:
Described photoelectric measurement module is positioned over sample high-pressure side, has two terminals, connects high pressure and sample respectively; Photoelectric measurement module comprises noninductive sampling resistor, band tail optical fiber laser diode (LD) and protective loop, and optical fiber is connected to photoelectric conversion device from laser diode, avoids the interference of spatial electromagnetic in transmitting procedure, and isolated ground disturbs; Photoelectric conversion device is positioned over noiseless region, receives the shelf depreciation light signal from photoelectric measurement module, different strong and weak light signal is converted to the electric signal of corresponding size, directly outputs in data collector; Data collector is oscillograph, computing machine or notebook computer;
Described protective loop comprises voltage dependent resistor (VDR), two-way twin zener dioder, protective resistance R
1with protective resistance R
2, the voltage dependent resistor (VDR) in protective loop is in parallel with noninductive sampling resistor, band tail optical fiber diode and protective resistance R1 series connection after in parallel with two-way twin zener dioder after, then with protective resistance R
2series connection, is finally connected to voltage dependent resistor (VDR) two ends;
The resistance of described noninductive resistance is variable, and the Standard resistance range of noninductive resistance is 50 Ω ~ 5K Ω, and office's discharge stream size of the sample high-pressure side that can measure is 6.26mA ~ 785mA;
Described band tail optical fiber laser diode flows through innings difference of discharge stream size according to it and sends the light of varying strength, is transmitted by afterbody optical fiber.
Described photoelectric measurement module application, in paper oil insulation air gap sample or oil film wedge sample, also measure local can leak the discharge inception voltage, discharge quenching voltage, discharge pulse frequency and the discharge pulse peak value that discharge.
Based on a detection method for local discharge for the laser diode of described detection system, it is characterized in that, comprise following steps:
1) photoelectric measurement module is positioned over sample high-pressure side, selectes the resistance of sampling resistor according to the size of high pressure end office (EO) discharge stream and sensitivity;
2) be sampling resistor protective loop in parallel;
3) in photoelectric measurement module, pigtailed laser diode sends the light of varying strength according to the difference of office's discharge stream size;
4) output of photoelectric measurement module is transmitted through the fiber to photoelectric conversion device, avoids the impact of spatial electromagnetic interference;
5) light signal of Optical Fiber Transmission is converted to electric signal by photoelectric conversion device, outputs to data collector;
6) data collector by the display device of oscillograph, computing machine or notebook computer through the size of the out discharge stream of statistical computation, discharge inception voltage, discharge quenching voltage, discharge pulse frequency and discharge pulse peak value.
The beneficial effects of the utility model propose a kind of partial discharge photoelectric detection system based on laser diode and method.Detection system comprises photoelectric measurement module, Optical Fiber Transmission, photoelectric conversion device, signal pickup assembly.This system seals in sampling resistor at sample high-pressure side, by laser diode, the current signal on sampling resistor is converted to light signal to transmit, the local discharge signal of energy direct-detection electrical equipment, the interference that isolated ground and spatial electromagnetic bring, has higher response characteristic.
Accompanying drawing explanation
Fig. 1 is partial discharge photoelectric detection system schematic diagram;
Fig. 2 is photoelectric measurement function structure chart;
Fig. 3 is the graph of a relation of sampling resistor resistance and detection office discharge stream scope;
Fig. 4 (a) is paper oil insulation cardboard air gap model;
Fig. 4 (b) is paper oil insulation air gap bath scaled model experimental device;
Fig. 4 (c) to give out light electrical measuring systems for the office of paper oil insulation air gap model under surge voltage;
Fig. 5 is that waveform is put in the office of paper oil insulation air gap sample under surge voltage;
Fig. 6 (a) is oil film wedge cardboard model;
Fig. 6 (b) is oil film wedge bath scaled model experimental device;
Fig. 6 (c) to give out light electrical measuring systems for the office of oil film wedge model under surge voltage;
Fig. 7 is that waveform is put in the office of oil film wedge sample under surge voltage.
Number in the figure: 1-high-pressure side; 2-sample; 3-optical fiber; 4-photoelectric measurement module; 5-photoelectric conversion device; 6-data collector; 7-high-voltage connection; 8-insulating sleeve; 9-ground lead; 10-high-pressure flat plate electrode; 11-ground connection plate electrode; 12-oilpaper air gap model; 13: surge voltage source; 14-ball electrode; 15-oil film wedge model.
Embodiment
The utility model relates to a kind of partial discharge photoelectric detection system based on laser diode, elaborates, but therefore do not limit content of the present utility model below in conjunction with specific embodiments and the drawings to the utility model.
Based on a partial discharge detecting system for laser diode, comprise photoelectric measurement module 4, optical fiber 3, photoelectric conversion device 5, data collector 6.
Fig. 1 is partial discharge photoelectric detection system schematic diagram; Photoelectric measurement module 4 is connected with high-pressure side 1 and sample 2, is connected with optical fiber 3 by pigtailed laser diode, by optical fiber 3, information is passed to low pressure end from high-pressure side.
Optical fiber 3 is connected with photoelectric conversion device 5, and photoelectric conversion device 5 receives the shelf depreciation light signal from photoelectric measurement module 4, different strong and weak light signal is converted to the electric signal of corresponding size.
Photoelectric conversion device 5 is connected with data collector 6, and the electric signal after conversion directly outputs in data collector 6 by photoelectric conversion device 5, and data collector 6 can select oscillograph, computing machine or notebook.
The job step of partial discharge detecting system system is:
Step 1: photoelectric measurement module 4 is positioned over sample 2 with high-pressure side 1 side and is connected, and office's discharge stream flows through pigtailed laser diode by the sampling resistor Rs dividing potential drop of suitable size, diode sends the light of varying strength according to office's discharge stream size.
Step 2: photoelectric measurement module 4 exports to be transmitted by optical fiber 3, avoids the impact of spatial electromagnetic interference, signal is transferred to low pressure end by high-pressure side.
Step 3: the light signal that optical fiber 3 transmits is converted to electric signal by photoelectric conversion device 5, outputs to data collector 6.
Fig. 2 is photoelectric measurement module 4 structural drawing, mainly comprises: pigtailed laser diode, sampling resistor Rs, protective resistance R
1, R
2, voltage dependent resistor (VDR) MOV and two-way twin zener dioder TVS.When shelf depreciation occurs sample 2, carry out dividing potential drop by the sampling resistor Rs of suitable resistance, pigtailed laser diode flows through innings difference of discharge stream size according to it and sends the light of varying strength, and the optical fiber 3 connected by afterbody is transmitted.Two-way twin zener dioder (TVS) acts on the same with voltage dependent resistor (VDR) (MOV); in parallel with protected circuit in the circuit board; after instantaneous voltage exceedes diode normal working voltage; TVS and MOV is supplied to momentary current super-low resistance path; momentary current is drawn away by diode; avoid protected device; protected loop remain off voltage was made before voltage resume normal value; can automatically reply high-impedance state after transient pulse terminates, whole loop enters normal voltage.The reaction velocity of TVS is very fast, and cut-off voltage is lower, and as first class of protection, MOV cut-off voltage is higher, as second class protection.Select R
1be 240 Ω, R
2be 800 Ω, the forward voltage of two-way twin zener dioder is 6.8V, and the pressure sensitive voltage of voltage dependent resistor (VDR) is 27V.The value principle of Rs can be selected according to the relation described in Fig. 3,
Fig. 3 is the graph of a relation of sampling resistor resistance and detection office discharge stream scope, and the difference of sampling resistor size can affect measurement range and the sensitivity of measuring circuit, R
stime less, measurement range is large, and sensitivity is low; R
stime larger, measurement range is little, highly sensitive.Such as work as R
sduring=50 Ω, can measure the maximum current flowing through discharge loop is 785mA, can measurement charging current in a big way and office's discharge stream.When loop current is greater than 131mA, LD just starts working, and easily misses less office's discharge stream; Work as R
sduring=5k Ω, the maximum current that can measure is 42.5mA, and minimum current is 6.26mA, and measurement range is less, but sensitivity is higher.
Fig. 4 is for the wiring diagram of paper oil insulation air gap sample under surge voltage, wherein Fig. 4 (a) is paper oil insulation cardboard air gap model, form by the rounded square insulating board of three layers of 80mm × 80mm is bonding, wherein interlayer insulation cardboard center has a diameter to be the circular opening of 10mm;
Fig. 4 (b) is paper oil insulation air gap bath scaled model experimental device, be made up of small one and large one two plate electrodes, with the airtight oil holder of organic glass bonding one-tenth 25cm*25cm*20cm, glass wall thickness 8mm, end sealing lid is housed simultaneously, slow down transformer oil ageing speed, ensure certain sealing.High-pressure flat plate electrode 10 diameter 40mm, thick 2mm; Ground connection plate electrode 11 diameter 75cm, thick 2mm; High-voltage connection 7 is furnished with insulating sleeve 8, the long 250mm of sleeve pipe 8.Copper earth tube and high-voltage connection 7 spacing 90mm, can meet insulating requirements in oil.All parts are cylinder design, avoid there is most advanced and sophisticated initiation shelf depreciation.Insulating board shown in Fig. 4 (a) is placed on two plate electrode centre position clampings;
Fig. 4 (c) to give out light electrical measuring systems for the office of paper oil insulation air gap model 12 under surge voltage, and surge voltage source 13 is two-stage high-level efficiency Marx loop, comprises DC-direct supply; D-high voltage silicon rectifier stack; R0-protective resistance; R'-charging resistor; Rf-wavefront resistance; Rt-wave terminal resistance; C0-main capacitance at different levels; C-load capacity; G0 ~ G1-ball gap; The high and low pressure arm electric capacity of C1, C2-underdamping capacitive divider; The underdamping resistance of r-voltage divider high-voltage arm.The intrinsic standoff ratio of capacitive divider is 2000:1.The high-pressure side 1 of optical fiber measurement module 4 connects surge voltage source and exports, and sample 2 end of optical fiber measurement module 4 connects oilpaper air gap model 12, and the output of photoelectric conversion device 5 is connected to data collector 6 by 50 Ω build-out resistors, selects oscillograph herein.
Fig. 5 is paper oil insulation air gap Partial Discharge under the surge voltage recorded.CH1 yellow signal is the waveform of the impulse source 13 that 2000:1 capacitive divider exports, and CH2 is the local discharge signal that in photodetector system, data collector 6 exports.Can find that the positive dirction discharge pulse with weak oscillation of a large amount of varying strength appears in wave rear part, by constantly experiment and exploration, the main parameters such as the discharge inception voltage of paper oil insulation air gap sample under surge voltage, discharge quenching voltage, discharge pulse frequency, discharge pulse peak value can be obtained further.
Fig. 6 is for the wiring diagram of oil film wedge sample under surge voltage.Wherein Fig. 6 (a) is oil film wedge cardboard model, forms by the rounded square insulating board of three layers of 120mm × 120mm is bonding.Fig. 6 (b) is oil film wedge bath scaled model experimental device, is made up of, by three-layer insulated Cardboard clamp bonding for drying in the middle of ball electrode 14 with ground connection plate electrode 11 ball electrode 14 and the ground connection plate electrode 11 of high-pressure side.With the airtight oil holder of organic glass bonding one-tenth 25cm*25cm*20cm, glass wall thickness 8mm, is equipped with end sealing lid simultaneously, slows down transformer oil ageing speed, ensures certain sealing.Smash electrode diameter 25mm, ground connection plate electrode diameter 75cm, high-voltage connection 7 is furnished with insulating sleeve 8, the long 250mm of sleeve pipe 8.Copper earth tube and high-voltage connection 7 spacing 90mm, can meet insulating requirements in oil.All parts are cylinder design, avoid there is most advanced and sophisticated initiation shelf depreciation, the insulating board shown in Fig. 6 (a) are placed on ball electrode 14 and clamp with plate electrode centre position;
Fig. 6 (c) to give out light electrical measuring systems for the office impacting lower oil film wedge model 15, and surge voltage source 13 is one-level Marx loop, comprises DC-direct supply; D-high voltage silicon rectifier stack; R0-protective resistance; Rf-wavefront resistance; Rt-wave terminal resistance; C0-main capacitance; G0-ball gap; The high and low pressure arm electric capacity of C1, C2-underdamping capacitive divider; The underdamping resistance of r-voltage divider high-voltage arm.The intrinsic standoff ratio of capacitive divider is 2000:1.The surge voltage wave head time is 1 μ s, and the wave rear time is 50 μ s, meets requirement of experiment.The output of data collector 6 is connected to data collector 6 by 50 Ω build-out resistors, selects oscillograph herein.
Fig. 7 is the Partial Discharge of oil film wedge model under the surge voltage recorded.CH1 yellow signal is the waveform of the impulse source 13 that 2000:1 capacitive divider exports, and CH2 is the local discharge signal that Photoelectric Detection module exports.Can find that the positive dirction discharge pulse with weak oscillation of a large amount of varying strength appears in wave rear part, by constantly experiment and exploration, the main parameters such as the discharge inception voltage of oil film wedge sample under surge voltage is 25.6KV, discharge quenching voltage is 25.6KV, discharge pulse frequency, discharge pulse peak value can be obtained further.The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (1)
1., based on a partial discharge detecting system for laser diode, comprise photoelectric measurement module, optical fiber, photoelectric conversion device and data collector, it is characterized in that:
Described photoelectric measurement module is positioned over local discharge of electrical equipment place, has two terminals, connects high-pressure side and sample respectively; Photoelectric measurement module comprises noninductive sampling resistor, band tail optical fiber laser diode (LD) and protective loop; Optical fiber is connected to photoelectric conversion device from laser diode; Photoelectric conversion device is positioned over noiseless region, is electrically connected with data collector; Data collector is oscillograph, computing machine or notebook computer;
Described protective loop comprises voltage dependent resistor (VDR), two-way twin zener dioder, protective resistance R
1with protective resistance R
2, the voltage dependent resistor (VDR) in protective loop is in parallel with noninductive sampling resistor, band tail optical fiber diode and protective resistance R
1series connection after in parallel with two-way twin zener dioder after, then with protective resistance R
2series connection, is finally connected to voltage dependent resistor (VDR) two ends;
The Standard resistance range of described noninductive resistance is 50 Ω ~ 5K Ω, and office's discharge stream size of the sample high-pressure side that can measure is 6.26mA ~ 785mA.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179490A (en) * | 2020-09-01 | 2021-01-05 | 北京九辰智能医疗设备有限公司 | Light intensity detection circuit and method with wide variation frequency and range |
| CN112924822A (en) * | 2021-01-27 | 2021-06-08 | 云南电网有限责任公司电力科学研究院 | Anti-interference method and device for partial discharge weak light detection |
-
2014
- 2014-07-21 CN CN201420402664.6U patent/CN204086459U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179490A (en) * | 2020-09-01 | 2021-01-05 | 北京九辰智能医疗设备有限公司 | Light intensity detection circuit and method with wide variation frequency and range |
| CN112924822A (en) * | 2021-01-27 | 2021-06-08 | 云南电网有限责任公司电力科学研究院 | Anti-interference method and device for partial discharge weak light detection |
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Granted publication date: 20150107 Termination date: 20170721 |
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