CN203249992U - Acousto-electric integration partial discharge detection sensor - Google Patents
Acousto-electric integration partial discharge detection sensor Download PDFInfo
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- CN203249992U CN203249992U CN 201320245728 CN201320245728U CN203249992U CN 203249992 U CN203249992 U CN 203249992U CN 201320245728 CN201320245728 CN 201320245728 CN 201320245728 U CN201320245728 U CN 201320245728U CN 203249992 U CN203249992 U CN 203249992U
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Abstract
The utility model provides an acousto-electric integration partial discharge detection sensor which comprises a metal shielding casing, a patch antenna and a coaxial cable connector. The bottom of the shielding casing is box body with an opening. The patch antenna is arranged in the shielding casing and faces the opening of the shielding casing. An ultrasonic receiving probe is exposed from the shielding casing. An integration circuit board is arranged in the shielding casing and is located between the patch antenna and the top wall of the shielding casing. A front amplification unit, a logarithmic detection unit and a power supply module are arranged on the integration circuit board, wherein the front amplification unit and the logarithmic detection unit are connected in turn and the power supply module are respectively connected with the front amplification unit and the logarithmic detection unit. The patch antenna is connected with the input end of the logarithmic detection unit. The ultrasonic receiving probe is connected with the input end of the front amplification unit. The logarithmic detection unit outputs signals through the coaxial cable connector. According to the utility model, the patch antenna and the ultrasonic receiving probe are arranged in the same sensor; and partial discharge is detected, and at the same time a discharge source is positioned.
Description
Technical field
The utility model belongs to high voltage electric power equip ment Partial Discharge Detecting Technology field, be particularly related to a kind of acoustic-electric one partial discharge detecting sensor based, for detection of the inner shelf depreciation situation of gas insulated combined electric appliance equipment (Gas Insulated Switchgear is hereinafter to be referred as GIS).
Background technology
The reliability and stability of electric system are that each electricity consumption department is to the basic demand of power industry.Along with expanding economy, the industry-by-industries such as industry, medical treatment, life are increasing to the demand of electricity, and are also more and more higher to the requirement of Power System Reliability.The reliability of electric system is that the reliability by power equipment ensures that the power equipment reliability of operation is directly connected to the safety and stablization of electric system.
In the insulation system of electrical equipment, the electric field intensity at each position is unequal often, when the electric field intensity in local zone reaches the breakdown field strength of this Region Medium, discharge will appear in this zone, but running through, this discharge do not execute between alive two conductors, be that whole insulation system does not puncture, still keep insulating property, this phenomenon is called shelf depreciation.Because inevitable defective all can cause shelf depreciation in manufacturing process, transportation and the assembling process: for example asymmetric generation point discharge of the electrode system of electrical equipment; since the medium that causes of manufacture process is inhomogeneous or transportation in cause collsion damage, introduce and contain bubble or moisture etc. in the metal tip that forms in dust, conductive particle or the equipment and hole, the insulator and all cause easily various forms of shelf depreciations in the electric system, contain bubble in the insulator and be the common reason that causes shelf depreciation.
Shelf depreciation is deteriorated sign and the forms of expression of common insulation of electrical installation such as GIS and transformer, shelf depreciation can cause the further deteriorated of insulating property, burn into damages insulating material gradually, region of discharge is constantly enlarged, finally may cause whole insulator to puncture, electric system is broken down, cause electrical equipment and machinery normally not to move, have a strong impact on thereby medical treatment, industry and resident living caused.Therefore, partial discharge phenomenon is accurately detected and measures is to ensure the electric system vital link that works, power equipment is carried out the in time insulation status of discovering device of Partial Discharge Detection, and the insulation hidden danger that exists keeped in repair investigation timely, can reduce maintenance cost, guarantee the normal operation of power equipment.
The high voltage electric power equip ment Partial Discharge Detection has developed to get comparative maturity in recent years, and the detection method of shelf depreciation is mainly ultrasonic Detection Method and ultrahigh frequency detection method.Ultrasound wave is the sound wave that frequency is higher than 20kHz, and ultrasonic Detection Method has preferably characteristics of the strong and directivity of anti-electromagnetic interference capability, but its sensitivity is lower and larger ground unrest is arranged, so never is widely used.The ultrahigh frequency detection method is because its high sensitivity and wide dynamic range, development was very fast in recent years, it is the most frequently used detection method for local discharge of present high-voltage electric power system, the ultrahigh frequency detection method receives from GIS internal leakage electric field signal out by the front end receiving antenna, and signal is reached the back-end processing circuit process, thereby to whether existing partial discharge phenomenon to detect in the system.Although ultrahigh frequency detection method strong anti-interference performance is sensitive to electric signal, realize the accurate contrast locating of equipment deficiency difficult.How to be implemented in when carrying out Partial Discharge Detection also that to position discharge position be that the technical matters that solves is badly in need of in this area.
Summary of the invention
The purpose of this utility model provide a kind of highly sensitive, anti-interference good, can realize the acoustic-electric one partial discharge detecting sensor based of partial discharge signal detection and discharge position positioning function.
To achieve these goals, the utility model is taked following technical solution:
Acoustic-electric one partial discharge detecting sensor based, comprise: metallic shield shell, paster antenna, coaxial cable connector, screening can is the box body of bottom-open, and paster antenna is arranged in the screening can and towards the opening of screening can, so that receive local discharge signal; The ultrasound wave receiving transducer, the ultrasound wave receiving transducer is exposed to screening can; Surface-mounted integrated circuit, surface-mounted integrated circuit is arranged in the screening can and between paster antenna and screening can roof, the pre-amplifier unit that is provided with successively connection on the surface-mounted integrated circuit and logarithmic detector unit and the power module that links to each other with pre-amplifier unit, logarithmic detector unit respectively; Paster antenna links to each other with the input end of logarithmic detector unit, and the ultrasound wave receiving transducer links to each other with the input end of pre-amplifier unit, and the logarithmic detector unit is exported signal by coaxial cable connector.
Preferably, the conductor patch of described paster antenna is arranged on the medium substrate, and the ground plate of described paster antenna is described screening can.
Preferably, the band bandwidth of described paster antenna is 100MHz～500MHz.
Preferably, described paster antenna comprises the conductor patch that two row intervals arrange, and each conductor patch is the bar shaped lamellar body, and two row conductor pasters are symmetrical arranged take the longitudinal centre line of paster antenna as axis of symmetry, and feeding point is positioned on the longitudinal centre line.
Preferably, the band bandwidth of described paster antenna is 200MHz～440MHz.
Preferably, described paster antenna adopts fed by coaxial probe.
Preferably, the specific inductive capacity of described medium substrate is 2.55.
Preferably, described pre-amplifier unit is that model is the amplification chip of AD620.
Preferably, described logarithmic detector unit is that model is the logarithmic detector chip of AD8310.
Preferably, the centre frequency of described ultrasound wave receiving transducer is 35kHz～75kHz.
By above technical scheme as can be known, the utility model is located at paster antenna and ultrasound wave receiving transducer in the same sensor, when detecting shelf depreciation, can obtain simultaneously the mistiming of acoustoelectric signal and acoustoelectric signal with a sensor, thereby having reduced office puts detection and locates required number of sensors, and paster antenna strong anti-interference performance, sensitive to electric signal, the ultrasound wave receiving transducer is not subjected to electrical Interference, because acoustic wave propagation velocity is less, be conducive to obtain the relatively accurate mistiming, utilize unlike signal different velocity of propagation in medium to be convenient to partial discharge location, also can improve setting accuracy simultaneously, both unite use, complement each other; And surface-mounted integrated circuit is arranged in the screening can, and screening can not only can disturb to external world and shield, and effectively avoids external interference.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the utility model;
Fig. 2 is the upward view of Fig. 1;
Fig. 3 is schematic block circuit diagram of the present utility model;
Fig. 4 is the circuit theory diagrams of the utility model pre-amplifier unit;
Fig. 5 is the circuit theory diagrams of the utility model logarithmic detector unit.
Below in conjunction with accompanying drawing embodiment of the present utility model is described in more detail.
Embodiment
As depicted in figs. 1 and 2, acoustic-electric one partial discharge detecting sensor based of the present utility model comprises metallic shield shell 1, paster antenna 2, coaxial cable connector 3, ultrasound wave receiving transducer 4 and surface-mounted integrated circuit 5.For convenience of description, define direction up and down with the center line A-A among Fig. 1.
The cassette shapes of the bottom opening that the screening can 1 of present embodiment forms by a pair of short sidewall 1a, a pair of long sidewall 1b and with roof 1c that aforementioned short sidewall 1a links to each other with long sidewall 1b, short sidewall 1a and the adjacent setting of long sidewall 1b, wherein, the bottom 1d of long sidewall 1b is base arcuate edge, the bottom 1d of this arc is from the lower limb of the long sidewall 1b indent that makes progress, its radian is corresponding with the disc insulator profile, so that be placed on the disc insulator when detecting.Short sidewall 1a is that the bottom is the square structure of straight line.Screening can also can adopt the box body structure of other shape.
In screening can 1, be provided with paster antenna 2, paster antenna 2 is comprised of conductor patch 2-1, medium substrate 2-2 and ground plate, conductor patch 2-1 is arranged on the medium substrate 2-2, and conductor patch 2-1 arranges towards the opening 1e of screening can 1, so that receive local discharge signal.The conductor patch 2-1 of paster antenna 2 is Copper Foil in the present embodiment, and it is that the material of medium substrate 2-2 is teflon on 2.55 the medium substrate 2-2 that conductor patch 2-1 is arranged at specific inductive capacity.Paster antenna 2 is installed in the screening can 1, and the screening can 1 of metal material serves as the ground plate of paster antenna 2 simultaneously.
As shown in Figure 2, the paster antenna 2 of present embodiment comprises the conductor patch 2-1 that two row intervals arrange, each conductor patch 2-1 is the bar shaped lamellar body, two row conductor paster 2-1 are symmetrical arranged take the longitudinal centre line b-b of paster antenna as axis of symmetry, feeding point A is positioned on the longitudinal centre line b-b, and paster antenna 2 adopts fed by coaxial probe.The band bandwidth of paster antenna 2 of the present utility model is 100MHz～500MHz, is preferably 200MHz～440MHz.
Ultrasound wave receiving transducer 4 is arranged on the screening can 1, is exposed to outside the screening can 1, and ultrasound wave is accepted probe 4 and linked to each other with surface-mounted integrated circuit 5 by coaxial cable.Put the ultrasonic signal of generation in order to receive stronger office, simultaneously in order to avoid the common interference such as mechanical vibration, the centre frequency of ultrasound wave receiving transducer 4 of the present utility model is preferably 35kHz～75kHz, what present embodiment was selected is that model is the ultrasonic sensor of NU40A18TR-1, and centre frequency is 40 ± 10kHz.
Surface-mounted integrated circuit 5 is arranged in the screening can 1.As shown in Figure 1, in screening can 1, paster antenna 2 arranges near the opening 1e of screening can 1, and surface-mounted integrated circuit 5 arranges near the roof 1c of screening can 1, and surface-mounted integrated circuit 5 is between the roof 1c of paster antenna 2 and screening can 1.Simultaneously with reference to Fig. 3, be provided with pre-amplifier unit 5-1, the logarithmic detector unit 5-2 and the power module 5-3 that connect successively on the surface-mounted integrated circuit 5, power module 5-3 links to each other with logarithmic detector unit 5-2 with pre-amplifier unit 5-1 respectively, power module 5-3 provides stable voltage for pre-amplifier unit 5-1 and logarithmic detector unit 5-2, can adopt powered battery.Paster antenna 2 links to each other with the input end of logarithmic detector unit 5-2 by coaxial cable and microwave high-frequency connector (Small A Type is called for short sub-miniature A connector), and paster antenna 2 receives the local discharge signal of revealing from GIS equipment; Ultrasound wave receiving transducer 4 links to each other by the input end of coaxial cable with pre-amplifier unit 5-1, and pre-amplifier unit 5-1 can guarantee the high sensitivity of ultrasound examination.Owing to exist serious low frequency electromagnetic to disturb in the free space, such as frequency modulation broadcasting (70～110MHz), (the most common strong jammings such as 65～860MHz), therefore paster antenna 2 of the present utility model need not carry out signal and amplifies CATV (cable television), is amplified greatly to avoid low-frequency noise.The output terminal of logarithmic detector unit 5-2 links to each other with subsequent conditioning circuit (oscillograph) by coaxial cable connector 3.The ground connection of paster antenna 2 of the present utility model and surface-mounted integrated circuit 5 ground connection that all links to each other with screening can 1.
When shelf depreciation occurs, attenuation and absorption can occur in the ultrasound wave that produces from the office source of putting the process that propagates into the ultrasound wave receiving transducer, the multiple losses such as reflection also can occur in the interface in different medium, and the ultrasonic signal that the ultrasound wave receiving transducer receives is extremely faint.Therefore, ultrasonic signal need to carry out detection by wave detector later on again by preposition amplification to be processed, and the pulse after detection is processed shows by oscillograph etc. at last.Testing circuit needs large dynamic range and higher sensitivity, so prime amplifier must be selected the amplifier of low noise, high-gain; In order to satisfy the requirement of great dynamic range and little distortion, wave detector is selected highly sensitive successive detection logarithmic amplifier simultaneously.
Preferably, it is the amplification chip of AD620 that pre-amplifier unit 5-1 of the present utility model adopts model, and AD620 is as prime amplifier, and that circuit connects is simple, noise is little, gain-adjusted is simple, highly sensitive.As shown in Figure 4, two input ends of AD620 are respectively with the input of the polarity free capacitor AC coupling of 0.1 μ F, and in order to reduce the low-frequency disturbance in the environment, two coupling capacitances form Hi-pass filter with the resistance of the 100k Ω of two end ground connection respectively.The pin 7 of chip and pin 4 are respectively positive and negative Power supply port, in order to prevent that the power end noise coupling from entering in the amplifier, each Power supply pin has polarity tantalum electric capacity by what connect that a paster encapsulates that the ceramic condenser of 0.1 μ F and paster encapsulate 10 μ F, and carries out power decoupling by a magnetic bead series connection.Pin 5 is reference pin, selects ground connection in order to guarantee that chip can work.The variable resistor that is connected to chip pin 1 and pin 8 is the gain adjusting resistance, find suitable gain in order to adjust the gain adjusting resistance, can select first the adjustable potentiometer of resistance in the circuit design, the resistance of the gain-adjusted resistance of present embodiment is 210 Ω, and this resistance can guarantee that the signal of frequency about 40kHz is exaggerated and can satisfies office and put the requirement of detection.
Preferably, it is the logarithmic detector chip of AD8310 that logarithmic detector of the present utility model unit 5-2 adopts model, it has the advantages such as low cost, small size, low-power consumption, high precision, high stability, wide dynamic range, frequency range can be from the audio frequency to the ultrahigh frequency, and the response time is fast, the load driving force is strong.Shown in Fig. 5, input impedance by R3, C8, C9 and chip forms the input port network jointly, pin 5 is power supply side, adopts the utmost point tantalum Capacitance parallel connection that has of the electrodeless electric capacity of 0.1 a μ F and 10 μ F to form power filter, and the access of connecting with a magnetic bead and small resistor.Common port pin two ground connection meets log slope regulating resistance R21 between pin 4 and pin 6.
During detection, ultrasound wave receiving transducer 4 and paster antenna 2 receive respectively sound, the electric signal of local discharge generation, transfer to pre-amplifier unit 5-1 after ultrasonic signal is received by ultrasound wave receiving transducer 4 and carry out the signal amplification, then reaching logarithmic detector unit 5-2 takes out its envelope, its amplitude is consistent with the original signal amplitude, can react the size of shelf depreciation release signal, put the foundation that detection, fault diagnosis, discharge source location etc. are judged as office; Electric signal is received by paster antenna 2, reaches equally logarithmic detector unit 5-2 and carries out detection; Because sound, propagation of electrical signals speed difference behind relevant treatment circuit extraction and analysis signal, are obtained sound, electric signal mistiming, can be used for estimating the position of discharge source range sensor.
Sensor of the present utility model is incorporated in ultrasound examination and Electromagnetic Wave Detection in the sensor treatment circuit, when whether detection shelf depreciation occurs, can also be applied to carry out the shelf depreciation location.When guaranteeing the sensor key property, in the past sound and two sensors of electricity are merged into one, required number of sensors in having reduced to detect has brought convenience for Site Detection and experiment, has also reduced testing cost simultaneously.And sensor adopts the metallic shield shell, and the electrical equipment detected with disc insulator etc. consists of good shielding, prevents that extraneous various undesired signal from entering sensor and causing the detection error.
Above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that, still can make amendment or be equal to replacement embodiment of the present utility model, the circuit of respectively having lifted a concrete model such as each integration module on the surface-mounted integrated circuit in the above description describes, but those skilled in the art still can design according to demand different circuit and realize identical function, these do not break away from any modification of the utility model spirit and scope or are equal to replacement, and it all should be encompassed in the scope of technical solutions of the utility model.
Claims (10)
1. acoustic-electric one partial discharge detecting sensor based, comprise: metallic shield shell, paster antenna, coaxial cable connector, described screening can is the box body of bottom-open, described paster antenna is arranged in the described screening can and towards the opening of screening can, so that receive local discharge signal;
It is characterized in that, also comprise:
The ultrasound wave receiving transducer, described ultrasound wave receiving transducer is exposed to described screening can;
Surface-mounted integrated circuit, described surface-mounted integrated circuit is arranged in the described screening can and between described paster antenna and screening can roof, the pre-amplifier unit that is provided with successively connection on the described surface-mounted integrated circuit and logarithmic detector unit and the power module that links to each other with described pre-amplifier unit, logarithmic detector unit respectively;
Wherein, described paster antenna links to each other with the input end of described logarithmic detector unit, and described ultrasound wave receiving transducer links to each other with the input end of described pre-amplifier unit, and described logarithmic detector unit is exported signal by described coaxial cable connector.
2. acoustic-electric one partial discharge detecting sensor based according to claim 1, it is characterized in that: the conductor patch of described paster antenna is arranged on the medium substrate, and the ground plate of described paster antenna is described screening can.
3. acoustic-electric one partial discharge detecting sensor based according to claim 1, it is characterized in that: the band bandwidth of described paster antenna is 100MHz～500MHz.
4. according to claim 1 and 2 or 3 described acoustic-electric one partial discharge detecting sensor baseds, it is characterized in that: described paster antenna comprises the conductor patch that two row intervals arrange, each conductor patch is the bar shaped lamellar body, two row conductor pasters are symmetrical arranged take the longitudinal centre line of paster antenna as axis of symmetry, and feeding point is positioned on the longitudinal centre line.
5. acoustic-electric one partial discharge detecting sensor based according to claim 3, it is characterized in that: the band bandwidth of described paster antenna is 200MHz～440MHz.
6. acoustic-electric one partial discharge detecting sensor based according to claim 4 is characterized in that: described paster antenna employing fed by coaxial probe.
7. acoustic-electric one partial discharge detecting sensor based according to claim 2, it is characterized in that: the specific inductive capacity of described medium substrate is 2.55.
8. acoustic-electric one partial discharge detecting sensor based according to claim 1, it is characterized in that: described pre-amplifier unit is that model is the amplification chip of AD620.
9. acoustic-electric one partial discharge detecting sensor based according to claim 1, it is characterized in that: described logarithmic detector unit is that model is the logarithmic detector chip of AD8310.
10. high-frequency local discharging detecting sensor according to claim 1, it is characterized in that: the centre frequency of described ultrasound wave receiving transducer is 35kHz～75kHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320245728 CN203249992U (en) | 2013-05-08 | 2013-05-08 | Acousto-electric integration partial discharge detection sensor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558523A (en) * | 2013-11-12 | 2014-02-05 | 国网上海市电力公司 | Detection device for partial discharge of switch cabinet |
| CN106154132A (en) * | 2016-08-31 | 2016-11-23 | 国家电网公司 | A kind of GIS partial discharge ultrasound wave superfrequency joint-detection localization method |
| CN106324459A (en) * | 2016-09-30 | 2017-01-11 | 国家电网公司 | GIS local discharging detecting system and method based on sound-electricity integration sensor |
| CN106501690A (en) * | 2016-10-28 | 2017-03-15 | 国网辽宁省电力有限公司辽阳供电公司 | A kind of XLPE power cables partial discharge diagnostic method and system |
| CN106556770A (en) * | 2016-11-24 | 2017-04-05 | 国网河南省电力公司周口供电公司 | A kind of self-priming leakage monitoring device and monitoring method |
| CN108414082A (en) * | 2018-02-22 | 2018-08-17 | 中国科学院近代物理研究所 | A kind of light radiation monitoring system of High-Power Microwave cavity |
| CN113419151A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Portable fault insulator online detection device and detection method |
| CN114509651A (en) * | 2022-04-15 | 2022-05-17 | 湖北工业大学 | GIS partial discharge external ultrasonic and ultrahigh frequency integrated sensor and detection method |
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2013
- 2013-05-08 CN CN 201320245728 patent/CN203249992U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558523A (en) * | 2013-11-12 | 2014-02-05 | 国网上海市电力公司 | Detection device for partial discharge of switch cabinet |
| CN106154132A (en) * | 2016-08-31 | 2016-11-23 | 国家电网公司 | A kind of GIS partial discharge ultrasound wave superfrequency joint-detection localization method |
| CN106324459A (en) * | 2016-09-30 | 2017-01-11 | 国家电网公司 | GIS local discharging detecting system and method based on sound-electricity integration sensor |
| CN106501690A (en) * | 2016-10-28 | 2017-03-15 | 国网辽宁省电力有限公司辽阳供电公司 | A kind of XLPE power cables partial discharge diagnostic method and system |
| CN106501690B (en) * | 2016-10-28 | 2019-02-15 | 国网辽宁省电力有限公司辽阳供电公司 | A kind of XLPE power cable partial discharge diagnostic method and system |
| CN106556770A (en) * | 2016-11-24 | 2017-04-05 | 国网河南省电力公司周口供电公司 | A kind of self-priming leakage monitoring device and monitoring method |
| CN108414082A (en) * | 2018-02-22 | 2018-08-17 | 中国科学院近代物理研究所 | A kind of light radiation monitoring system of High-Power Microwave cavity |
| CN108414082B (en) * | 2018-02-22 | 2024-02-02 | 中国科学院近代物理研究所 | Optical radiation monitoring system of high-power microwave cavity |
| CN113419151A (en) * | 2021-07-15 | 2021-09-21 | 贵州电网有限责任公司 | Portable fault insulator online detection device and detection method |
| CN113419151B (en) * | 2021-07-15 | 2022-07-01 | 贵州电网有限责任公司 | Portable fault insulator online detection device and detection method |
| CN114509651A (en) * | 2022-04-15 | 2022-05-17 | 湖北工业大学 | GIS partial discharge external ultrasonic and ultrahigh frequency integrated sensor and detection method |
| CN114509651B (en) * | 2022-04-15 | 2022-07-19 | 湖北工业大学 | GIS partial discharge external ultrasonic and ultrahigh frequency integrated sensor and detection method |
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