CN104849640A - Fault diagnosis system for distribution network based on double threshold values - Google Patents
Fault diagnosis system for distribution network based on double threshold values Download PDFInfo
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Abstract
The invention discloses a fault diagnosis system for a distribution network based on double threshold values, and the system comprises a data collection module and a portable detection device. The data collection module is used for collecting local ultraviolet intensity and temperature value of distribution network equipment in real time. The portable detection device is used for the analysis of information collected by the data collection module. The data collection module comprises an ultraviolet sensor, an optical fiber temperature measurement sensor, a photoelectric conversion unit, an analog-digital conversion unit, and a main controller, wherein the ultraviolet sensor, the optical fiber temperature measurement sensor, the photoelectric conversion unit, the analog-digital conversion unit and the main controller are connected sequentially. Threshold values formed by the data of the ultraviolet sensor and the optical fiber temperature measurement sensor serve as a judgment condition for a distribution network fault. The portable detection device is connected with a sensor aviation plug of the main controller through a signal transmission fiber, and collects the data of the ultraviolet sensor and the optical fiber temperature measurement sensor. Through the advanced ultraviolet sensing technology, the system can achieve the advance control and warning of partial discharge flashover which is one of main patterns of manifestation of facility faults of the distribution network.
Description
Technical field
The invention belongs to technical field of power systems, relate to the malfunction monitoring that distribution is arranged, be specifically related to a kind of Distribution Network Failure diagnostic system based on bivalve value.
Background technology
The no matter final performance of the apparatus failure of distribution facility how, the destructiveness that produces has much, always having some abnormal signs in early stage, such as temperature anomaly raises, pressure increase in cabinet, and flashover etc. is put in current break, office.Catch these abnormal signs accurately and give warning in advance, in time care and maintenance being carried out to equipment, just likely effectively avoiding the generation of accident.But, due to system high voltage appearance, big current, electromagnetic interference source is many, neighbourhood noise is serious etc., and problem that many impacts detect exists, therefore, how to select the reliable sensing technology of a kind of essential safety, accurately and timely early diagnosis and early warning are carried out to the various potential risks of distribution net equipment, be a technical barrier always, also there is no a set of good solution at present.In addition, because distribution facility is large in number and widely distributed, one is carried out Accurate Diagnosis and early warning system to various potential faults be developed, the unit cost of input and the feasibility applied from now on be also one must not irrespective problem.Therefore, the level monitoring that the passiveness of alarm and protection is passive is just started after being also in the industry Distribution Network Failure generation so far.
But in view of high voltage fault originates from the shelf depreciation flashover of equipment mostly, therefore the method for power industry detection shelf depreciation is a lot.Popular at present have ultraviolet image method, supercritical ultrasonics technology and ultrahigh frequency method etc.1) ultraviolet image method is adopted to measure shelf depreciation, in the shelf depreciation process of distribution net equipment surface, electric discharge position is by a large amount of radiates ultraviolet, so just, highly sensitive ultraviolet radiation receptacle can be adopted---ultraviolet imager, come uitraviolet intensity and the development trend thereof of radiation in recording surface discharge process, come the insulation status of indirect assessment operational outfit and the defect of Timeliness coverage insulation system, prevented and safeguard.But current ultraviolet light imaging instrument is on the market expensive, and is as detecting instrument off-line operation, is therefore difficult to apply in various lots of distribution network systems.2) ultrahigh frequency method is adopted to detect shelf depreciation.Ultrahigh frequency partial discharge detects ultrahigh frequency (300 ~ 3000MHz) electric signal that (UHF) puts generation mainly through checkout equipment inside office, realizes the detection and positioning of shelf depreciation, and its sensor is actually the antenna receiving ultra-high frequency signal.The advantage of ultra-high-frequency detection method is can the shelf depreciation of detecting devices built-in electrical insulation, and signal not easily blocks in transmittance process, therefore this technology obtains very fast development in recent years, is applied in the detection of some power equipments (as GIS, motor, cable).But shortcoming is ultra-high frequency signal is easily subject to other high frequency interference, as neighbouring shelf depreciation, wireless broadcasting and TV communication, remote measuring and controlling signal etc., the high high-voltage switch cabinet body tank wall in addition of rate of false alarm also can bring adverse effect to electromagnetic wave propagation, and the difficulty that uhf electromagnetic wave detects is put in the office of adding.3) supercritical ultrasonics technology is adopted to detect shelf depreciation.Ultrasonic Detection Method, mainly through detecting the ultrasound wave produced in gas discharge, realizes the detection and positioning of shelf depreciation.The sonac of usual employing is piezoelectric sensor, and for avoiding magnetic noise and the mechanical vibration noise of equipment, the frequency range selected is 70 ~ 150kHz.Supersonic testing method comparatively speaking reliability is more weaker, comprises the loss of ultrasonic signal in media interior communication process, and the various sources of environmental interference that may run into.Be mainly used at present qualitatively judging the generation whether having Partial discharge signal.
Present stage, to distribution net equipment surface and the monitoring of contact temperature, major part also rests on the artificial inspection stage, also has to be undertaken by modes such as wireless temperature measurements, but all there is respective deficiency.
Electric power worker, by instrumentations such as infrared thermometers, manually measures switch cabinet contact temperature.But due to switch cubicle One's name is legion, inefficiency of manually patrolling.Distribution net equipment inner high voltage part is mostly closed structure, and due to safety, personal monitoring is not thorough, it is undetected that to fail to report phenomenon serious, and the professional standards being often confined to monitoring personnel are judged to the development of hidden danger, randomness is comparatively large, is difficult to for the repair based on condition of component of equipment provides reliable criterion.So the non real-time monitoring of artificial inspection mode does not obviously meet the requirement of distribution automation.
Wireless temperature measurement method popular at present, because sensor itself is electron device, needing battery or small current mutual inductor to get can to thermometric chip power supply, again the signal that thermometric chip obtains is radioed to receiver by wireless chip, although this scheme achieves the wireless transmission of temperature signal, but due to powered battery need timing change battery, and battery summer high-temperature resistance poor, bring impact to the operation of power department; And adopting current transformer to get energy, sensing head volume is comparatively large, and whether convenient the position laid is very large on power taking impact, lacks general adaptability.
Also have a kind of technology adopting passive and wireless mode sensing contact temperature, namely front end sensors part adopts surface acoustic wave techniques design, carrys out measuring tempeature according to the SAW (Surface Acoustic Wave) device concussion frequency change that temperature variation causes.The core component of SAW (Surface Acoustic Wave) device is SAW oscillator, and its passive principle of work eliminates powerup issue, overcomes the problem of active radio temp measuring method.But this technology is also in early stage of development, also there is the problems such as antijamming capability under strong electric field environment is not strong, less stable at present, be difficult to realize applying on a large scale.
Summary of the invention
According to above the deficiencies in the prior art, the present invention proposes a kind of distribution office based on ultraviolet light detection technique and puts flashover on-line monitoring system, carry out Information Monitoring by ultraviolet light transducer and in real time flashover Real-Time Monitoring is put to distribution, solve the problem that ultraviolet image method cost compare is high, have that antijamming capability is strong, rate of false alarm is low, sensitivity advantages of higher.
To achieve these goals, the technical scheme that the present invention takes is: a kind of Distribution Network Failure diagnostic system based on bivalve value, comprise data acquisition module, portable detector, described data acquisition module is used for uitraviolet intensity and the temperature value of Real-time Collection distribution net equipment local, described portable detector is used for analyzing the information of data collecting module collected, and described data acquisition module comprises the ultraviolet light transducer, optical fiber temperature measuring sensor, photoelectric conversion unit, AD conversion unit, the master controller that connect successively; The data composition bivalve value surveyed by ultraviolet light transducer and optical fiber temperature measuring sensor is as the Rule of judgment of Distribution Network Failure, described portable detector is connected with the sensor aviation plug of master controller by signal transmission fiber, gathers the data of ultraviolet light transducer and optical fiber temperature measuring sensor.
This system also comprises the alarm module carrying out when system exception reporting to the police, and described alarm module comprises acousto-optic warning unit and SMS alarm unit, and described SMS alarm unit is dealt on setting phone number by note when system exception and reports to the police.Hummer in described acousto-optic warning unit and malfunction indicator lamp are embedded on master controller panel.Described data acquisition module is also provided with the display unit be connected with master controller, for duty, sensing data, the historical data of display system.Reverse scaling circuit and Hi-pass filter is provided with between described photoelectric conversion unit and AD conversion unit, ultraviolet light transducer receives ultraviolet light pulse, the current pulse signal of negative sense is converted to through photoelectric conversion module, through preposition reverse scaling circuit, obtain forward voltage signal, forward voltage signal is by Hi-pass filter filtering low-frequency disturbance; After carrying out analog to digital conversion, signal is delivered to device master controller.Temperature signal is converted to modulated light signal by the sensor head of described optical fiber temperature measuring sensor, and by light signal by fiber optic conduction to photoelectric conversion module, on the sensor aviation plug joint of the current and voltage signals of photoelectric conversion module access master controller.Described data acquisition module is installed with on switch cubicle, and ultraviolet light transducer is installed with on the fragmenting plate of switch cubicle or framework, the part that photosensitive part installed surface will be protected to switch cubicle; Described optical fiber temperature measuring sensor is arranged on high-voltage cable joint and high voltage bus joint, switch cabinet contact and node, chopper switch key position, described portable detector is used for detection data write into Databasce to plot curve map, by simulated experiment with arrange corresponding office to the historical experience of on-the-spot distribution facility failure hidden danger latent period and critical point and real-time follow-up record and put flashover alarm door limit value.
Beneficial effect of the present invention is: by this product, to ultraviolet light sensing technology in detection distribution net equipment shelf depreciation flashover, deep research is carried out with the application feasibility of Fiber Optic Pyrometer in detection distribution net equipment overheating, for power supply department provides the technological means of new on-line checkingi distribution net equipment potential faults, carrying out contrast with other various detection method existing provides reference.Because this equipment is of portable form, can an equipment to the distribution net equipment in a region, patrol officer is only needed to carry equipment, read spot sensor data one by one, the monitoring product all gathered with current each functional module is on the market compared, office side needs input a lot of less, realizes the monitoring of Distribution Network Failure hidden danger at low cost and early warning mechanism provides a kind of effective solution for power supply department.
Accompanying drawing explanation
Below the content expressed by this Figure of description and the mark in figure are briefly described:
Fig. 1 is the system construction drawing of the specific embodiment of the present invention.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and principle of work, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.
This product adopts ultraviolet light office advanced in the world to put acquisition sensor and optical fiber temperature measuring sensor is basic configuration, in line with economical and practical principle, and product function modular design.The Distribution Network Failure putting detection and the two criterion of temperature rise threshold values based on ultraviolet light office diagnose and early warning intelligent patrol detection mancarried device can when distribution switch cubicle facility Daily Round Check the incipient fault of early prediction appliance circuit, to the reliability improving the long-term work of distribution switch cubicle, have great significance.Intelligent patrol detection mancarried device, can one-to-many, distribution net equipment on-the-spot sensor installation probe, and does not need to install additional monitoring main frame, power supply, communication module etc., and greatly save the cost of product, low cost drops into and Distribution Network Failure monitoring just can be made evidence-based.
(1) optical fiber temperature-measurement sensing head is highly sensitive, non-active operation, adopts light sensing and optical transport mode completely, temperature detection and Signal transmissions same optical fiber, not by electromagnetic interference (EMI), and essential safety insulation, explosion-proof lightning protection.System is installed very easy, and scene only needs to be fixed on by sensor fibre on point for measuring temperature and easily can complete installment work, is highly suitable for the occasion of high voltage, strong-electromagnetic field and bad environments.
(2) put in ionization process in office, the electronics in air constantly obtains and releases energy, and when electronics releases energy, be attended by luminous radiation phenomenon, its radiation spectrum comprises visible ray, infrared ray, ultraviolet.When wherein UV radiation is propagated in an atmosphere, decay is less, and the ultraviolet of day-old chick is not vulnerable to the interference of environmental factor, comparatively stable, so select UV radiation as the characteristic quantity of Partial Discharge Detection, is the extremely effective means of one.But like product is expensive at present, and be unfavorable for promoting.This product adopts low cost, highly sensitive day-old chick ultraviolet light sensing tube, detects the ultraviolet radiation that shelf depreciation flashover produces, and belong to international pioneering, do not have experience to use for reference, should consider actual effect, consider cost again, difficulty is very large.
(3) will according to the mounting points position of on-site actual situations determination ultraviolet light transducer and temperature probe and position, and portable metering device needs to design targetedly to the processing mode of sensor signal and alarming threshold value etc., on hardware is selected or all have larger difficulty and workload in the design and programming of system software.
(4) setting of mancarried device early warning and alarming threshold values, local display early warning and alarming information or sound and light alarm, simple and clear.
As shown in Figure 1, a kind of Distribution Network Failure diagnostic system based on bivalve value, comprise data acquisition module, portable detector, described data acquisition module is used for uitraviolet intensity and the temperature value of Real-time Collection distribution net equipment local, described portable detector is used for analyzing the information of data collecting module collected, and described data acquisition module comprises the ultraviolet light transducer, optical fiber temperature measuring sensor, photoelectric conversion unit, AD conversion unit, the master controller that connect successively; Master controller is the heart of whole device, each functional module all must be connected by master controller, first the change that senses of sensor probe, undertaken converting the receptible signal of microprocessor to by photoelectric conversion module, timing microprocessor or periodically (can arrange) read sensor data, pass through the communication between communication module simultaneously, be given to communication module by the agreement of regulation and be transmitted to main station system, also can carry out display current state etc. by local LCDs etc.When the state gathered exceedes the early warning and alarming value of setting, pointed out by acousto-optic warning unit, by the button that switches on power, the normal out-put supply of power module, master controller and other modules are by work.The data composition bivalve value surveyed by ultraviolet light transducer and optical fiber temperature measuring sensor is as the Rule of judgment of Distribution Network Failure, described portable detector is connected with the sensor aviation plug of master controller by signal transmission fiber, gathers the data of ultraviolet light transducer and optical fiber temperature measuring sensor.
This system also comprises the alarm module carrying out when system exception reporting to the police, and described alarm module comprises acousto-optic warning unit and SMS alarm unit, and described SMS alarm unit is dealt on setting phone number by note when system exception and reports to the police.Hummer in described sound and light alarm module and malfunction indicator lamp are embedded on master controller panel.To be given a warning sound by hummer, simultaneously by main controller controls LED, allow malfunction indicator lamp carry out flashover, point out different malfunctions etc. according to different definition and threshold values.Described data acquisition module is also provided with the display unit be connected with master controller, and liquid crystal display adopts the wide-temperature LCD of 192X 64, and its backlight is Design of power saving; Pilot lamp adopts high-brightness LED light emitting diode, and video module is used for the man-machine interaction of equipment, and show present device duty, sensing data, historical record etc., man-machine interface is clear understandable.Reverse scaling circuit and Hi-pass filter is provided with between described photoelectric conversion unit and AD conversion unit, ultraviolet light transducer receives ultraviolet light pulse, the current pulse signal of negative sense is converted to through photoelectric conversion module, through preposition reverse scaling circuit, obtain forward voltage signal, forward voltage signal is by Hi-pass filter filtering low-frequency disturbance; After carrying out analog to digital conversion, signal is delivered to device master controller.Temperature signal is converted to modulated light signal by the sensor head of described optical fiber temperature measuring sensor, and by light signal by fiber optic conduction to photoelectric conversion module, on the sensor aviation plug joint of the current and voltage signals of photoelectric conversion module access master controller.Described data acquisition module is installed with on switch cubicle, and ultraviolet light transducer is installed with on the fragmenting plate of switch cubicle or framework, the part that photosensitive part installed surface will be protected to switch cubicle; Described optical fiber temperature measuring sensor is arranged on high-voltage cable joint and high voltage bus joint, switch cabinet contact and node, chopper switch key position, described portable detector is used for detection data write into Databasce to plot curve map, by simulated experiment with arrange corresponding office to the historical experience of on-the-spot distribution facility failure hidden danger latent period and critical point and real-time follow-up record and put flashover alarm door limit value.
Power module: switch cubicle scene generally has the external power supply of 220V to provide, and power module converts 220V to the voltage required for the modules such as master controller, the multiple voltage such as power module exportable 12V, 5V.
Acquisition sensor is put at open space in ultraviolet light office, such as bus-bar room, and the installation interval of arc photosensor is maximum can reach 4 meters.Sensor can be arranged on switch cubicle demarcation strip or on framework.Photosensitive part is arranged in 10mm hole, and the part will protected in switch-oriented cabinet, fixes with self-tapping screw.Ultraviolet light office puts acquisition sensor and also can be arranged in protection zone with installing plate.The other end of ultraviolet light is received on the terminal of photoelectric conversion module.Optical fiber temperature measuring sensor is arranged on high-voltage cable joint and high voltage bus joint, switch cabinet contact and the key position such as node, chopper switch, temperature signal is converted to modulated light signal by sensor head, and by light signal by fiber optic conduction to photoelectric conversion module, on the sensor aviation plug joint of the current and voltage signals of photoelectric conversion module access master controller.Hummer in sound and light alarm module and malfunction indicator lamp are embedded on master controller panel.Power module is all arranged in master controller cabinet.
Product operation: power module is connected external 220V power supply, handle assembly power switch closes simultaneously, and each several part of device will be started working automatically.Communication module by the data retransmission of field device to backstage main website, backstage main website sends over data preparation monitoring device and becomes curve map, and write into Databasce, by simulated experiment with to a large amount of investigation of on-the-spot distribution facility failure hidden danger latent period and critical point and real-time follow-up record, corresponding office is accurately set and puts flashover alarm door limit value, and show early warning and warning message in several ways.
The present invention is by adopting advanced ultraviolet light sensing technology, can realize putting flashover in advance control and an early warning to the office of one of the main forms of distribution facility failure hidden danger, change artificial inspection or accident in the past and after occurring, just find and process the way of distribution facility failure point position, thus the development process of Utilities Electric Co.'s distribution automation has been risen to the aggressive new stage in advance predicted from the troubleshooting afterwards that passiveness is passive, for construction and the safe operation of national intelligent grid, there is important impetus.Have that antijamming capability is strong, rate of false alarm is low, sensitivity advantages of higher.Put in ionization process in office, the electronics in air constantly obtains and releases energy, and when electronics releases energy, be attended by luminous radiation phenomenon, its radiation spectrum comprises visible ray, infrared ray, ultraviolet.When wherein UV radiation is propagated in an atmosphere, decay is less, and the ultraviolet of day-old chick is not vulnerable to the interference of environmental factor, comparatively stable, so select UV radiation as the characteristic quantity of Partial Discharge Detection, is the extremely effective means of one.In addition, adopt ultraviolet light transducer as system headend, both cost was significantly less than expensive ultraviolet imager, can realize real time on-line monitoring again, in power matching network system, have great application value.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.The protection domain that protection scope of the present invention should limit with claims is as the criterion.
Claims (8)
1. the Distribution Network Failure diagnostic system based on bivalve value, it is characterized in that, this system comprises data acquisition module, portable detector, described data acquisition module is used for uitraviolet intensity and the temperature value of Real-time Collection distribution net equipment local, described portable detector is used for analyzing the information of data collecting module collected, and described data acquisition module comprises the ultraviolet light transducer, optical fiber temperature measuring sensor, photoelectric conversion unit, AD conversion unit, the master controller that connect successively; The data composition bivalve value surveyed by ultraviolet light transducer and optical fiber temperature measuring sensor is as the Rule of judgment of Distribution Network Failure, described portable detector is connected with the sensor aviation plug of master controller by signal transmission fiber, gathers the data of ultraviolet light transducer and optical fiber temperature measuring sensor.
2. the Distribution Network Failure diagnostic system based on bivalve value according to claim 1, it is characterized in that, this system also comprises the alarm module carrying out when system exception reporting to the police, described alarm module comprises acousto-optic warning unit and SMS alarm unit, and described SMS alarm unit is dealt on setting phone number by note when system exception and reports to the police.
3. the Distribution Network Failure diagnostic system based on bivalve value according to claim 2, it is characterized in that, the hummer in described acousto-optic warning unit and malfunction indicator lamp are embedded on master controller panel.
4. the Distribution Network Failure diagnostic system based on bivalve value according to claim 1, it is characterized in that, described data acquisition module is also provided with the display unit be connected with master controller, for duty, sensing data, the historical data of display system.
5. the Distribution Network Failure diagnostic system based on bivalve value according to claim 1, it is characterized in that, reverse scaling circuit and Hi-pass filter is provided with between described photoelectric conversion unit and AD conversion unit, ultraviolet light transducer receives ultraviolet light pulse, the current pulse signal of negative sense is converted to through photoelectric conversion module, through preposition reverse scaling circuit, obtain forward voltage signal, forward voltage signal is by Hi-pass filter filtering low-frequency disturbance; After carrying out analog to digital conversion, signal is delivered to device master controller.
6. the Distribution Network Failure diagnostic system based on bivalve value according to claim 1, it is characterized in that, temperature signal is converted to modulated light signal by the sensor head of described optical fiber temperature measuring sensor, and by light signal by fiber optic conduction to photoelectric conversion module, on the sensor aviation plug joint of the current and voltage signals of photoelectric conversion module access master controller.
7. the Distribution Network Failure diagnostic system based on bivalve value according to claim 1, it is characterized in that, described data acquisition module is installed with on switch cubicle, and ultraviolet light transducer is installed with on the fragmenting plate of switch cubicle or framework, the part that photosensitive part installed surface will be protected to switch cubicle; Described optical fiber temperature measuring sensor is arranged on high-voltage cable joint and high voltage bus joint, switch cabinet contact and node, chopper switch key position.
8. the Distribution Network Failure diagnostic system based on bivalve value according to claim 1, it is characterized in that, described portable detector is used for detection data write into Databasce to plot curve map, by simulated experiment with arrange corresponding office to the historical experience of on-the-spot distribution facility failure hidden danger latent period and critical point and real-time follow-up record and put flashover alarm door limit value.
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Application publication date: 20150819 |