CN201532416U - Intelligent cable monitor - Google Patents

Intelligent cable monitor Download PDF

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Publication number
CN201532416U
CN201532416U CN2009201984905U CN200920198490U CN201532416U CN 201532416 U CN201532416 U CN 201532416U CN 2009201984905 U CN2009201984905 U CN 2009201984905U CN 200920198490 U CN200920198490 U CN 200920198490U CN 201532416 U CN201532416 U CN 201532416U
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China
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circuit
microprocessor
sensor
cable
current
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CN2009201984905U
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Chinese (zh)
Inventor
张群
周力忠
孙志飞
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杭州鸿特电器有限公司
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Priority to CN2009201984905U priority Critical patent/CN201532416U/en
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Publication of CN201532416U publication Critical patent/CN201532416U/en

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Abstract

The utility model relates to power equipment and discloses an intelligent cable monitor which comprises two microprocessors, and an electronic circuit connected with the microprocessors to conduct data exchange, wherein the two microprocessors are respectively defined as a first microprocessor and a second microprocessor; the electronic circuit comprises a serial communication interface circuit, a multicircuit relay circuit, a signal shaping circuit, a high-speed comparator circuit, a voltage and frequency converting circuit, a serial liquid crystal display driving circuit, an LED indicator lamp circuit, a keying circuit, current sensors, temperature sensors and a fiber-optical communication module, wherein four current sensors are arranged, and four channels are arranged; six temperature sensors are arranged, and six channels are arranged. The intelligent cable monitor integrates cable current monitoring with switch cabinet temperature monitoring, realizes simultaneous monitoring on two physical quantities, and is specially used for conducting real-time monitoring on the cable current information and the switch cabinet contact temperature information of high-voltage cables of the level of 10kV to 35kV.

Description

The electrical cable intelligent monitor

Technical field

The utility model relates to power equipment, relates in particular to a kind of cable monitoring instrument.

Background technology

Along with Chinese society and expanding economy, living standards of the people improve constantly, and prevent and reduce natural disasters and are more and more paid close attention to by society, and the prevention of fire and warning have in time become an important task of preventing and reducing natural disasters in the rural area, city.In fact, in all kinds of fire failures that take place, cause again and again up to all dangerous electricity consumption more than 70%.Along with Chinese electrical network large-scale redevelopment, huge variation has taken place in the electric network composition in city, power cable presents multistage multiloop characteristic in Urban Buried Pipeline Network, and the structure of isolating switch, on-load switch and looped network in the distribution, when improving the electricity consumption reliability, also brought new challenge to power network monitoring.

Country requires high pressure directly to enter the urban district in urban distribution network is built, and gos deep into load center, and electric energy transmits by underground cable, and controller switching equipment and surrounding environment are harmonious.But meanwhile,, cause the equipment for power transmission and distribution structure to become increasingly complex because of the requirement of the raising of equipment for power transmission and distribution electric pressure, robotization and looped network, a large amount of uses of underground cable, also more and more higher to the requirement of environmental baseline; In case ground connection or short trouble take place in equipment for power transmission and distribution or cable, tend to cause regional power outage, the repairing personnel often can only pass through exclusive method, to the trial throw of closing a floodgate one by one of network classification branch loop, trouble spot, waste time and energy, so both influenced power supply reliability, influenced the operate as normal and the life of power consumer, and in the trial throw process, might produce the equipment of power consumer again and impact or damage.

Present multistage multiloop characteristic at power cable, and the structure of isolating switch, on-load switch and looped network in the distribution, cause the killer switch tripping operation in case break down for some reason, the repairing personnel press for detection technique means quick failure judgement interval and the fault type by the advanced person, and isolated fault point also recovers not decrease the power supply of circuit as early as possible.

The high-tension switch cabinet of generating plant, transformer station is important electric equipment simultaneously.In equipment long-time running process, positions such as the contact in the switch cubicle and bus row junction are because of wearing out or contact resistance is excessive generates heat, and the temperature of these heating positions can't be monitored, and finally causes fire failure thus.

In recent years, in power plant and transformer station a lot of switch cubicle overheat accidents have taken place, caused fire and large-area power outage, solving the switch cubicle problems of excessive heat is to stop the key that this type of accident takes place.Ruuning situation by contact temperature in monitoring cable current and the switch cubicle, cable fault information takes place also in time to provide in the fire that can effectively prevent switch cubicle, but because the space is narrow and small in the high-tension switch cabinet, surrounding environment all has hyperbaric environment, therefore the thermometric of can't manually patrolling realizes that electric current and on-line temperature monitoring are the important means that guarantees power cable and high-tension switch cabinet safe operation.

Cable monitoring functions of the equipments in the past are single, data acquisition independent, discretize, no network communicating function, effectively remote access and teledata intellectual analysis, transmission adopt cables, poor anti jamming capability, equipment can not the large tracts of land systematized management, intelligent degree is lower etc.This present situation has just limited the unitized control and management of whole unit, brings heavier burden for daily the patrolling and examining of administration of power networks department.Therefore; development, exploitation, a kind of novel intelligent monitoring equipment that integrates the intelligent short circuit sensing technology of high-performance, fire prevention alarm technique, the automatic identification record technology of fault of production; all having very important social meaning and economic implications for prevention electric short circuit fire, protection lives and properties, also is the urgent demand of maintaining social stability and guaranteeing safe production.

In existing disclosed patent documentation, such as, application number is 200810018813.8, the applying date is on January 25th, 2008, open day is on August 13rd, 2008, the application people is characterized in that for the Chinese invention patent application of Southeast China University discloses a kind of multifunctional electric cable failure detector this tester is by field programmable gate array chip, field programmable gate array configuration store chip, serial communication interface circuit, the emission driving circuit, the multicircuit relay circuit, the signal condition shaping circuit, the high-speed comparator circuit, analog to digital conversion circuit, the numerically-controlled precise potentiometer, the liquid crystal display displays circuit, light emitting diode lamp circuit and key circuit are formed.The tester of this invention can be tested the length of twisted-pair feeder, whether twisted-pair feeder overlength, the connectedness of twisted-pair feeder (comprises open circuit, short circuit, reversal connection, wrong right, faults such as overlength), fault type (comprises short circuit, open circuit), multiple parameters such as position of failure point location and return loss, can quick and precisely obtain the technical parameter of twisted-pair feeder and realize that abort situation detects and the location, has the measuring accuracy height, dependable performance, portable characteristics, but the fire that can not effectively prevent switch cubicle takes place and cable fault information in time is provided, and therefore has necessity of further improvement and optimization.

Summary of the invention

The utility model is single at the cable monitoring functions of the equipments that prior art exists, the data acquisition independent, discretize, no network communicating function, effectively remote access and teledata intellectual analysis, the transmission cables that adopt more, poor anti jamming capability, equipment can not the large tracts of land systematized management, shortcomings such as intelligent degree is lower, provide a kind of other high-tension cable of the 10KV-35KV of being specifically designed to level to carry out the real-time monitoring cable current information and the electrical cable intelligent monitor of switch cabinet contact temperature information, it is integrated in one cable current monitoring and switch cubicle temperature monitoring, monitoring when realizing two kinds of physical quantitys, and be independent of each other separately, but the complementary reflection electrical network practical operation situation of energy provides reliable data simultaneously.

In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:

The electrical cable intelligent monitor comprises microprocessor, the electronic circuit of line data exchange of going forward side by side that links to each other with microprocessor, and described microprocessor is two, is defined as the first microprocessor and second microprocessor respectively; Described electronic circuit comprises serial communication interface circuit, multicircuit relay circuit, signal transformation circuit, high-speed comparator circuit, voltage and freq converting circuit, serial liquid crystal display drive circuit, light emitting diode lamp circuit, key circuit, current sensor, temperature sensor and optical fiber communication module; Wherein, current sensor is four, and is provided with four passages, and temperature sensor is six, and is provided with six passages.

Two at a high speed embeddings decline and handle is the core devices of whole monitor, is controlling the work of whole monitor and the processing computing of test data; Serial communication interface circuit be monitor with host computer between the interface of communicating by letter, be used to receive the control command of host computer and realize uploading of test data; The multicircuit relay circuit is used to control long-range contact and reports to the police; Signal transformation circuit will be converted into the potential pulse coded signal that has amplified from the light signal of multiple sensor; The high-speed comparator circuit is used to catch, gather the big current information of cable sudden short circuit, and carries out and set reference voltage and compare, and the output control signal is given the microprocessor in the sensor, carries out the emergency alarm of short trouble; The voltage signal that voltage and freq converting circuit are used for collecting is converted into the correspondent frequency signal, finishes the signal transformation in early stage of microprocessor; Serial liquid crystal display drive circuit, display circuit, light emitting diode lamp circuit and key circuit are formed the Man Machine Interface of native system, be used to show test data, the selection that realizes function and the setting of parameter, current sensor, temperature sensor and optical fiber communication module are finished the data communication between sensor and the little processing.

As preferably, the circuit that described current sensor forms comprises that impedance inverter circuit, voltage and freq converting circuit, the microprocessor of the induced signal input circuit, electric current and the voltage that link to each other successively carry out numerical coding circuit, microprocessor driven photomodulator and light signal to frequency and carry out optical fiber transmission line.

As preferably, the circuit that described temperature sensor forms comprises metering circuit, logic control circuit, 820nm modulation optical fiber interface and the power supply that links to each other successively.

As preferably, be connected with emergent sensor circuit on the described first microprocessor and second microprocessor.Emergent sensor circuit is used for emergent accident is carried out timely detection alarm.

The utility model has significant technique effect owing to adopted above technical scheme:

1. aspect data acquisition, by reasonable utilization faraday electromagnetic induction principle, by gathering the cable conversion that electromagnetic eddy is on every side realized " magnetic-", can carry out the hardware bypass when cable is short-circuited reports to the police, guarantee the reliability of alerting signal, move under the normal situation simultaneously, can rely on lithium battery power supply in the sensor to carry out the analog acquisition of induced signal at cable.

2. in data transmission, by utilization optical fiber transmission technique, optical fiber amplifying technique, sensor technology, serial communication technology, intelligent remote fault diagnosis technology.

3. aspect power management, adopt two MPU designs, the temperature fault signals collecting is separated in ground connection and short trouble collection fully with reporting to the police, under electrical network and outside all power supply powering-off states, monitor can rely on the lithium battery that self disposes to carry out the Normal Alarm of ground connection and short trouble signal, be 8 years the theoretical shelf life of battery, and the intelligent energy-saving technology has obtained reasonable implementation in this product.

4. aspect the indication warning, adopt LED light and LCD LCD screen to show simultaneously, realize the setting of alert frequency by the dutycycle of regulating the LED driving, rationally use the LCD display technique, realize the driving of lattice lcd screen, externally under the situation that power supply loses, can utilize inner lithium battery power supply, realize the LED light indication of reliably reporting to the police.

Description of drawings

Fig. 1 is the structure FB(flow block) of the utility model embodiment.

Fig. 2 is the structure FB(flow block) of current sensor circuit in the present embodiment.

Fig. 3 is the structure FB(flow block) of temperature sensor circuit in the present embodiment.

Fig. 4 is the wiring diagram of electric power management circuit in the present embodiment.

Fig. 5 is the wiring diagram of current sensor circuit in the present embodiment.

Fig. 6 is the wiring diagram of temperature sensor circuit in the present embodiment.

Fig. 7 is the wiring diagram of serial liquid crystal display circuit in the present embodiment.

Fig. 8 is the wiring diagram of serial communication circuit in the present embodiment.

Fig. 9 is the wiring diagram of power indicating circuit in the present embodiment.

Figure 10 is the wiring diagram of emergent sensor circuit in the present embodiment.

Embodiment

Below in conjunction with accompanying drawing 1 to Figure 10 and embodiment the utility model is described in further detail:

Embodiment electrical cable intelligent monitor, extremely shown in Figure 10 as Fig. 1, comprise first microprocessor 4 electronic circuit of line data exchange of going forward side by side that links to each other with second microprocessor 5, with two microprocessors, electronic circuit comprises serial communication interface circuit, multicircuit relay circuit, signal transformation circuit, high-speed comparator circuit, voltage and freq converting circuit 2, serial liquid crystal display drive circuit, light emitting diode lamp circuit 6, key circuit 7, current sensor 3, temperature sensor 1 and optical fiber communication module; Current sensor 3 is four, and is provided with four passages, and temperature sensor 1 is six, and is provided with six passages.

The circuit that described current sensor 3 forms comprises that impedance inverter circuit 32, voltage and freq converting circuit 2, the microprocessor of the induced signal input circuit 31, electric current and the voltage that link to each other successively carry out numerical coding circuit 33, microprocessor driven photomodulator 34 and light signal to frequency and carry out optical fiber transmission line 35.

The circuit that described temperature sensor 1 forms comprises metering circuit 11, logic control circuit 12,820nm modulation optical fiber interface 13 and the power supply 14 that links to each other successively.

Be connected with emergent sensor circuit 8 on the described first microprocessor 4 and second microprocessor 5.Emergent sensor circuit 8 is used for emergent accident is carried out timely detection alarm.

In the present embodiment, comprise a monitor main frame and ten sensors, the monitor main frame mainly by first microprocessor 4, second microprocessor 5 and be connected first microprocessor 4 and second microprocessor 5 on peripheral electronic circuitry equipment form, ten sensors are respectively four current sensors 3 and six temperature sensors 1.

Wherein, four current sensors 3 are respectively three phase detectors and a grounding sensor, all adopt optical fiber as transmission medium.Sensor ring is buckled in cable surface, realizes data monitoring by the variation of gathering the cable peripheral electromagnetic field.The collection of sensor and the operation of cable are independent of each other, and can not bring any interference to electrical network.Traditional transmission mode is generally the cable transmission aspect transmission, because the transport property of long distance can make the voltage signal in the cable seriously decay, and in walking line process, occur the cable electromagnetism easily and disturb phenomenon mutually, and be difficult to solve, so present embodiment adopts the numerical coding Optical Fiber Transmission, the digitally encoded signal that transmits in the optical fiber for special use, be different from the transmission mode of cable fault monitoring in the traditional product, and light signal is decayed very little in optical fiber, stability is very high, be not subjected to the interference in any magnetic field on every side, so just realize (80 meters of ultimate ranges) the noiseless transmission of long distance.

The internal circuit of current sensor 3 as shown in Figure 2, its principle of work is as follows:

1. sensor mainly relies on built-in chargeable lithium cell power supply, electric current moves under the normal state in cable, sensor at first carries out electromagnetic induction by the silicon soil suite ring that is looped around cable surface, the eddy currents of magnetic flux of the variation of sensing is converted to the electric current that sensor internal changes, the frequency and the phase-locking of reality in the frequency of the electric current of sensing and phase place and the cable.

2. after induction current carries out the impedance variation of current-voltage through internal circuit, enter the modular converter of voltage-frequency, this module is mainly finished the voltage signal with certain variation range, be converted into the frequency signal of the corresponding linear change with it of 0-30KHZ, so that little process chip is gathered and computing, realized the transformation of analog to digital signal.

3. inner microcontroller processor realizes that by the timer of chip self average per 6 seconds, (per minute is gathered 10 points) carried out (voltage-frequency module) gathered once, through accurate analytical calculation, fuzzy fault-tolerant, be scaled respective coding, as the raw data of transmitting in the optical fiber.

4. drive light emitting devices by photomodulator and carry out the input of fiber-optic signal.

5. short circuit early warning module is a module that is independent of outside the lithium battery power supply, mainly contain comparer, low-pass filter and reference voltage source are formed, the power supply of this circuit is taken from induction current, when short trouble takes place, induction current in the sensor will increase moment, the induced voltage signal amplitude also can skyrocket thereupon, this moment low-pass filtering, comparer, voltage reference will be started working, realize the alarm mechanism of hardware interrupts formula, directly signal is passed to the fixedly IO mouth of microcontroller chip, after the microcontroller signal receives this signal, will be called special-purpose short-circuit alarming coding, send to photomodulator, in order to the transmission of short-circuit signal.Since the microcontrolled sampling period be 6 seconds once, when short trouble takes place, often the time rank is in the millisecond rank, so, short circuit early warning Module Design adds and thoroughly to have solved numerous traditional product false alarms and to have failed to report alert defective, short circuit early warning module integrated significant in this product.

The sensor built-in lithium battery average in actual use 6 second once sampling, start primary voltage-freq converting circuit, switching time, the power consumption of battery was very little in the millisecond rank, be 8 years theoretical tenure of use.Carry charging circuit in the sensor circuit designs simultaneously, when cell voltage is lower than 2.8V, the comparer upset can drive triode the base current in the cable of sensing is carried out low current charge, when cell voltage during more than or equal to 3.6V, comparer overturns once more, charging circuit quits work, and realizes one time charging process.Owing to have independent reliable and stable power supply power supply in the sensor, can make the antijamming capability of circuit stronger, make the signals collecting work under the rugged surroundings become possibility.

In the present embodiment, six temperature sensors 1 are installed in respectively on the contact of three inlet wires of switch cubicle and three outlets, in order to real-time monitoring contact temperature, the criterion cable temperature is unusual, the temperature data summary sheet that arrives by sensor acquisition, but positions such as contact in the early warning switch cubicle and bus row junction are because of wearing out or the excessive fire failure that causes of contact resistance.Accident potential can be nipped in the bud, for the safe operation of electric power network provides sound assurance.

Special-purpose digital temperature element is contained in temperature sensor 1 inside, can directly the temperature information of simulating be converted into digital signal corresponding, and by built-in microcontroller processor, with the digital signal recompile, and the driving photomodulator carries out Optical Fiber Transmission.

The circuit structure of temperature sensor 1 as shown in Figure 3, its principle of work is as follows:

1. Optical Fiber Transmission formula temperature sensor is used to measure the temperature on charged object surface, as the running temperature of exposed contact in the high-tension switch cabinet and bus junction.Sensor is made up of temperature sensor, metering circuit, logic control circuit, 820nm optical fiber modulation interface and feed circuit, and sensor is modulated into light signal with temperature signal, and light signal is arrived intelligent monitor by fiber optic conduction.

2. fibre optic temperature sensor is an integral structure, adopts the encapsulation of pyrocondensation overcoat, is used for detected temperatures in a side of fibre optic temperature sensor, and this sensor is fit to temperature-measuring range and is lower than 125 ℃ environment.

3. the built-in chargeable lithium cell of fibre optic temperature sensor, theoretical work year is limited to 8 years, so because temperature sensor is that high-precision digital temperature sensor has all reached advanced level of the same trade on overall power and acquisition precision.Conventional temperature monitoring method mainly adopts thermopair, thermal resistance, semiconductor temperature sensor equitemperature sensing element to realize, these temperature sensors all need the plain conductor transmission signals, owing to can't guarantee to have stable insulating property, thereby can't use on the contact in high-tension switch cabinet.Adopting optical fiber is to use the fiber optic transmission digital signal as the temperature sensor of transmission medium, light transmitting fiber has excellent insulating property, high-tension electricity magnetic interference in can isolating switch cabinet, therefore Fibre Optical Sensor can directly be installed on the interior high-voltage contact of switch cubicle and cable surface, accurately measure the running temperature and the cable current information of high-voltage contact, realize the on-line monitoring of switch cubicle contact running temperature and cable current.

In the present embodiment, the monitor main frame adopts advanced AI (artificial intelligence) technology and fuzzy control technology, by built-in expert database, the performance of measuring and using is an unprecedented increase.

The reliable performance of monitor main frame mainly comes from the design that this main frame adopts dual processor, both guaranteed the speed of logical operation, simultaneously because the low-power consumption characteristic of himself, this processor can be worked under the situation of a joint lithium battery power supply, guaranteed the work that this monitor externally also can normal reliable under the power supply situation about losing owing to the fault of electric system, the microprocessor of 16 bit (first microprocessor 4) of the MSP430 series that the employed microprocessor of this monitor is developed by the famous Texas Instruments of industry (TI) and the 32-bit microprocessor (second microprocessor 5) of the ARM kernel that ST Microelectronics (ST) produces are formed.

The task mechanism of first microprocessor 4 is as follows:

First microprocessor 4 relies on the characteristic of the super low-power consumption of himself mainly to finish the monitoring of short circuit and earth fault accident, after sensor arrives the optical fiber interface of main frame by optical fiber with coding transmission, at first light signal is converted into digital signal level by photomodulator, amplify the special I mouth that offers first microprocessor 4 afterwards through the impedance conversion fiber-optic signal, through the intelligence check and correction, fuzzy fault-tolerant, call the relevant mathematical modeling in the expert database, final determine failure message, with failure message in the mode of LED light-emitting flash in the indication of reporting to the police of the front panel of main frame.

This microprocessor is understood the electric weight of periodic monitor built-in lithium battery simultaneously, when being lower than setting value, the voltage of lithium battery will drive charging circuit to lithium cell charging, under the state of lithium battery electric weight abundance, the electric pilot lamp that has on the microprocessor meeting driving host panel has the electricity indication.

First microprocessor 4 is waited for the data transfer of second microprocessor 5 at any time, comprising functions such as alarming threshold value, the earth fault alarming threshold value of short circuit current fault, the control that resets, the time set that automatically resets, self check controls.

The task mechanism of second microprocessor 5 is as follows:

Second microprocessor 5 adopts 32 level controllers of the ARM core of ST company, speed and anti-interference aspect have outstanding performance, jumbo internal memory is that the intelligence database Linked Invoke is guaranteed simultaneously, the optical fiber live signal (current signal and temperature signal) that this processor is mainly finished in product 10 passages is gathered and is handled, electric current light signal and temperature light signal change digitally coded voltage signal into through photomodulator, and by the amplification of impedance conversion realization fiber-optic signal, the special I mouth of input arm processor is decoded, and call and remember data link in the intelligence database, automatically write down the relevant interface characteristic, handle or submit to daily record to carry out intelligent analogy, we have given this system certain self-learning capability when program design, can select the threshold values error automatically according to the data variation of peak times of power consumption, can effectively avoid the interference of current surge, can carry out intelligent memory and study to the electric current moment saltus step habitually of electrical network, particularly the various situations of peak times of power consumption in season effectively back up, generate daily record of work, and the serial ports remote transmission is provided, print etc.The adding of artificial intelligence technology makes product effectively solve defectives such as the misoperation of similar monitoring product, false alarm, for power system management department provides a cover complete field data, is the important references of high-tension switch cabinet safe operation.

Second microprocessor 5 is responsible for the input and output work of numerous hardware in the operational process of complete machine, as the single self check of threshold value setting, passage of the resetting of button, self check, electric current and temperature, data zero clearing, serial communication data test, telecommunication, LCD liquid crystal display and and first microprocessor 4 between exchanges data.

In the threshold value setting process, can control second little processing 5 preservation threshold values early warning data by the button of regulating above the panel, second little processing 5 can preserve to data sync first microprocessor 4 automatically after setting was finished, so just, can the software modification short circuit and the alarming threshold value of ground connection and unlike the conventional current monitoring, will the hardware circuit in the sensor being made amendment, significantly reduce maintenance and maintainer's work working strength, and guaranteed staff's personal safety.

Aspect remote data transmission, second microprocessor 5 carries the UART serial communication interface can realize long-range 485 communications, real-time temperature data and current data are uploaded to the upper monitoring computing machine, inherent address difference according to this monitoring main frame, can realize networking function, consolidated network can be realized collective's running of 255 monitoring main frames down simultaneously, under the situation that increases driver, gather when can realize more IP, promoted network information function comprehensively, realize the automatic intelligent monitoring, solved the demand for development that the manual logging mode of traditional way to manage and data can not satisfy modern industry.

The networking of real-time collection, data statistics and the inquiry of electric power network electric current and temperature information has become modern power systems increases work efficiency, and reduces the effective means of grid loss.Realize the real-time collection and the data analysis of field data and facility information, instruction long-range assigned and to the functions such as control of equipment, the widely distributed monitoring equipment of an urgent demand is realized networking.

The utlity model has high reliability and security, cheap relatively price, make this instrument can be installed to every high-voltage switch gear cashier's office in a shop, it is intelligent that switch cubicle is had, pass through host computer, can write down the electric current and the temperature data of switch cubicle operation,, realize the precognition maintenance of switch cubicle fault for the maintenance of switch cubicle provides foundation.

The utility model has mainly used artificial intelligence technology, fuzzy control technology, optical fiber transmission technique etc.It is made of self-contained software program, utilizes the information and executing task that is stored in the embedded knowledge base, has certain intelligent and autonomous learning; Can discern data on one's own initiative according to the rule of system definition, and can generate event information, send to processor by flexible bus and be further processed according to monitoring interface standard storehouse and stipulations storehouse from monitoring terminal.

Adopt to embed the power consumption high speed MCU that declines, realize high speed acquisition ability and responding ability when guaranteeing the product low power consumption, having outstanding performance aspect software filtering, light () logical operation, the intellectual coded check and correction.

Faradic electricity magnetic induction technology, optical fiber amplifying technique, the sensor technology used in the Design of Sensor process, signal transmission module adopt optical fiber transmission technique to realize opto-electronic conversion and coding and decoding, promote the antijamming capability and the fault-detecting ability of product.Passive sensor and cell winding and magnet ring noncontact design; the front-end collection of having realized electrical network running and signal is independent of each other; add inner overload protection circuit, standard of precision voltage, low-pass filter circuit, peak-holding circuit, hysteresis comparator circuit; effectively the filtering electric network noise has improved acquisition precision.

The monitoring main frame adopts LED display technique, LCD display technique, intelligent energy-saving technology, serial communication technology, intelligent remote fault diagnosis technology respectively in design.

The key issue that the utility model mainly solves is:

Towards 500kV in the development of above UHV (ultra-high voltage), high capacity, the real-time monitoring of the ruuning situation of High voltage power supply equipment is particularly important in current electric system.The analysis showed that, contact resistance, the connector temperature that factors such as overload cause is too high, it is the main cause that causes cable splice place insulation ag(e)ing initiating failure, the high-tension switch cabinet of transformer station is in the long-time running process, positions such as switch cubicle contact and bus row junction are because of wearing out or contact resistance is excessive generates heat, and the temperature of these heating positions can't be monitored, and finally causes fire failure thus.Therefore,,, upload warning at once, notify the maintainer in time to get rid of hidden danger, fault is eliminated in bud, thereby reach the purpose of safe power supply in case the temperature anomaly situation occurs if can effectively monitor the temperature of each node automatically.

But, electric system particularly in high voltage power transmisson system monitoring insulation and anti-electromagnetic interference (EMI) be the extremely crucial and insoluble problem of often running into.For a long time, in the product of cable temperature and current monitoring, exist many insoluble problems always, electromagnetic interference problem particularly, because the high voltage structures in the switch cubicle, the thermometric of can't manually patrolling, more impossible use instrument carries out closely on-the-spot current monitoring, so Design of Sensor and cheap transmission plan have become in the power monitoring system problem that expectation solves.

Therefore, in sensor design, adopt use, the circuit board large tracts of land of components and parts, the power supply of lithium battery independent current source, artificial intelligence technology and the fuzzy control technology of high anti-interfering performance to cover the method for designing of copper, efficiently solve sensor acquisition temperature that electromagnetic interference (EMI) brings and defective such as float to increase interference free performance and to adopt the private mask housing.

The utility model adopts optical fiber as transmission medium to be because optical fiber has characteristics such as anti-electromagnetic interference (EMI), electric insulation, waterproof, corrosion-resistant and essential safety, optical fiber is to be made by quartz material, has very high chemical stability, use the sensor transmissions mode that optical fiber constitutes, be not subjected to the influence of electromagnetic interference (EMI), electrical insulative property completely is provided.The technical barriers such as thermometric, flow measurement and distant signal transmission of can't manually patrolling have so just been solved because the interior space of high-tension switch cabinet is narrow and small.

Ruuning situation by contact temperature in monitoring cable current and the switch cubicle, the fire that can effectively prevent switch cubicle takes place also can in time provide cable fault information, avoid causing fire and large-area power outage, the on-line monitoring of therefore realizing temperature and electric current is the important means that guarantees the high-tension switch cabinet safe operation.

Conventional current monitoring method all is to adopt the mutual inductor method to need outside power supply separately, and the normal cable transmission that adopts of signal transmission, because the transport property of long distance can make the voltage signal in the cable seriously decay, and in transmitting line process, occur the cable electromagnetism easily and disturb phenomenon mutually, brought extra error for to a certain extent the collection of signal, and stable, and be difficult to solve along with working time and cable surface variation of temperature also can cause very big influence to collection.So the utility model adopts the numerical coding Optical Fiber Transmission, the digitally encoded signal that transmits in the optical fiber for special use, be different from the transmission mode of cable fault monitoring in the traditional product, and light signal is decayed very little in optical fiber, stability is very high, be not subjected to the interference in any magnetic field on every side, so just realize (80 meters of ultimate ranges) the noiseless transmission of long distance.

Conventional temperature monitoring method mainly adopts thermopair, thermal resistance, semiconductor temperature sensor equitemperature sensing element to realize, these temperature sensors all need the plain conductor transmission signals, owing to can't guarantee to have stable insulating property, thereby can't use on the contact in high-tension switch cabinet.

Because the utility model is operated in the particular surroundings of strong electromagnetic, so at the beginning of product design, just propose to adopt the dielectric material of optical fiber as the signal transmission, in the product realization electrical isolation with very big degree in service, effectively mask electromagnetic interference (EMI), insulating property are very good simultaneously, can make the staff regional away from Keep Clear-High Voltage, bring great convenience for maintenance and maintenance work, therefore optical fiber passes running temperature and the cable current information that sensor can accurately be measured high-voltage contact, realizes the on-line monitoring of switch cubicle contact running temperature and cable current.

In a word, the above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.

Claims (4)

1. electrical cable intelligent monitor comprises microprocessor, the electronic circuit of line data exchange of going forward side by side that links to each other with microprocessor, and it is characterized in that: described microprocessor is two, is defined as first microprocessor (4) and second microprocessor (5) respectively; Described electronic circuit comprises serial communication interface circuit, multicircuit relay circuit, signal transformation circuit, high-speed comparator circuit, voltage and freq converting circuit (2), serial liquid crystal display drive circuit, light emitting diode lamp circuit (6), key circuit (7), current sensor (3), temperature sensor (1) and optical fiber communication module; Wherein, current sensor (3) is four, and is provided with four passages, and temperature sensor (1) is six, and is provided with six passages.
2. electrical cable intelligent monitor according to claim 1 is characterized in that: the circuit that described current sensor (3) forms comprises that impedance inverter circuit (32), voltage and freq converting circuit (2), the microprocessor of the induced signal input circuit (31), electric current and the voltage that link to each other successively carry out numerical coding circuit (33), microprocessor driven photomodulator (34) and light signal to frequency and carry out optical fiber transmission line (35).
3. electrical cable intelligent monitor according to claim 1 is characterized in that: the circuit that described temperature sensor (1) forms comprises metering circuit (11), logic control circuit (12), 820nm modulation optical fiber interface (13) and the power supply (14) that links to each other successively.
4. electrical cable intelligent monitor according to claim 1 is characterized in that: be connected with emergent sensor circuit (8) on described first microprocessor (4) and second microprocessor (5).
CN2009201984905U 2009-10-15 2009-10-15 Intelligent cable monitor CN201532416U (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102411119A (en) * 2011-11-21 2012-04-11 合肥工业大学 Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station
CN102680761A (en) * 2011-03-09 2012-09-19 中国石油集团长城钻探工程有限公司 Electric logging method and system for subsurface instruments
CN102867405A (en) * 2012-09-25 2013-01-09 珠海市康定电子股份有限公司 Real time remote optical fiber meter reading system
CN102901574A (en) * 2011-07-25 2013-01-30 万洲电气股份有限公司 Detection circuit suitable for on-line temperature of high-voltage solid-state soft starter
CN103439613A (en) * 2013-09-03 2013-12-11 苏州太谷电力股份有限公司 Electric power security integrated monitoring device and analyzing method thereof
CN103630266A (en) * 2013-12-16 2014-03-12 上海华魏光纤传感技术有限公司 Optical fiber temperature measurement host, optical fiber temperature measurement system and optical fiber temperature measurement method
CN103698593A (en) * 2013-12-27 2014-04-02 黑龙江大学 Multi-sensor sensing effect display method and display system
CN103995209A (en) * 2014-04-04 2014-08-20 国家电网公司 Detection method for adhesion state of 220kV bundled conductor
CN104237621A (en) * 2014-08-25 2014-12-24 国家电网公司 Integrated monitoring system and monitoring method for high-voltage cable
CN104316839A (en) * 2014-11-07 2015-01-28 国网辽宁省电力有限公司鞍山供电公司 Power equipment and transmission line malfunction comprehensive online monitoring system
CN104502784A (en) * 2015-01-05 2015-04-08 苏州路之遥科技股份有限公司 Target wire harness self-learning testing method for wire harness intelligent testing machine
CN105182102A (en) * 2015-07-16 2015-12-23 江西华强金源电气有限公司 Small hydropower internet access wire outlet end monitoring device
CN105466580A (en) * 2014-09-26 2016-04-06 大同大学 Method using near field communication technology to manage logistics temperature
CN105652144A (en) * 2016-04-13 2016-06-08 深圳市国新动力科技有限公司 Detection device and method of battery pack wire harness
CN106526297A (en) * 2015-09-10 2017-03-22 施耐德电器工业公司 Device for monitoring an electrical conductor and electrical installaton comprising such a device
CN109270336A (en) * 2018-10-30 2019-01-25 国网江苏省电力有限公司南通供电分公司 A kind of underground laying distribution line cable current monitoring system and its monitoring method

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102680761B (en) * 2011-03-09 2016-05-11 中国石油集团长城钻探工程有限公司 Downhole instrument electric measuring method and system
CN102680761A (en) * 2011-03-09 2012-09-19 中国石油集团长城钻探工程有限公司 Electric logging method and system for subsurface instruments
CN102901574A (en) * 2011-07-25 2013-01-30 万洲电气股份有限公司 Detection circuit suitable for on-line temperature of high-voltage solid-state soft starter
CN102411119B (en) * 2011-11-21 2013-09-18 合肥工业大学 Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station
CN102411119A (en) * 2011-11-21 2012-04-11 合肥工业大学 Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station
CN102867405A (en) * 2012-09-25 2013-01-09 珠海市康定电子股份有限公司 Real time remote optical fiber meter reading system
CN103439613A (en) * 2013-09-03 2013-12-11 苏州太谷电力股份有限公司 Electric power security integrated monitoring device and analyzing method thereof
CN103630266A (en) * 2013-12-16 2014-03-12 上海华魏光纤传感技术有限公司 Optical fiber temperature measurement host, optical fiber temperature measurement system and optical fiber temperature measurement method
CN103698593A (en) * 2013-12-27 2014-04-02 黑龙江大学 Multi-sensor sensing effect display method and display system
CN103995209A (en) * 2014-04-04 2014-08-20 国家电网公司 Detection method for adhesion state of 220kV bundled conductor
CN104237621A (en) * 2014-08-25 2014-12-24 国家电网公司 Integrated monitoring system and monitoring method for high-voltage cable
CN105466580A (en) * 2014-09-26 2016-04-06 大同大学 Method using near field communication technology to manage logistics temperature
CN104316839A (en) * 2014-11-07 2015-01-28 国网辽宁省电力有限公司鞍山供电公司 Power equipment and transmission line malfunction comprehensive online monitoring system
CN104502784A (en) * 2015-01-05 2015-04-08 苏州路之遥科技股份有限公司 Target wire harness self-learning testing method for wire harness intelligent testing machine
CN105182102A (en) * 2015-07-16 2015-12-23 江西华强金源电气有限公司 Small hydropower internet access wire outlet end monitoring device
CN106526297A (en) * 2015-09-10 2017-03-22 施耐德电器工业公司 Device for monitoring an electrical conductor and electrical installaton comprising such a device
CN105652144A (en) * 2016-04-13 2016-06-08 深圳市国新动力科技有限公司 Detection device and method of battery pack wire harness
CN109270336A (en) * 2018-10-30 2019-01-25 国网江苏省电力有限公司南通供电分公司 A kind of underground laying distribution line cable current monitoring system and its monitoring method

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