CN1932908A - Wireless on-line monitoring system and method with electric distribution network cable connector running state - Google Patents
Wireless on-line monitoring system and method with electric distribution network cable connector running state Download PDFInfo
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Abstract
A wireless on-line monitor system for monitoring the running state of cable tie-in to electric power distribution grid relates to one or more end gathering equipment, one or more controller and server. The end gathering equipment under the controller tests running parameter of cable tie-in to electric power distribution grid, and it offers power supply by levitation electromagnetic induction communications electrical source unit. The controller controls one or more end gathering equipment to capture the running parameter of running end gathering equipment and sends running parameter to server. The server disposes and analyzes the running parameter of controller to confirm running state of cable tie-in to electric power distribution grid and forecast its future running state. It monitors the temperature and current to confirm the running state of cable tie-in to electric power distribution grid and to enhance the safety and reliability of electric power distribution grid to exploit power transmission and distribution ability of electric power equipment.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of electric distribution network cable connector running state wireless on-line monitoring system and method.
Background technology
Along with power industry and The development in society and economy, electric pressure constantly raises, and net capacity is increasing, and the security of electrical production, operation and the requirement of reliability are also constantly improved.
At present, in generating plant and transformer substation system, there is a large amount of high voltage cable joints, for example, medium and high voltage cable joint, high voltage bus tie point, middle-high voltage switch and make and break contact and load ratio bridging switch (being referred to as cable connector) etc.Owing to flowing through, big electric current make cable connector possibility occurrence temperature overheated, cable connector under big electric current running status owing to the existence of contact resistance cause overheated, when contact point is overheated, might make contact point further loose contact occur, thereby cause power failure and accident, cause big economic loss.Therefore, in time understand the running temperature and the current conditions of cable connector, carry out preventive measure in advance, help the stable of electric system production and operation.
At present, this field mainly contains following four kinds of methods to high-voltage charged body thermometric mode now: laser, infrared ray, image and wireless.
Can use temperature-indicating wax label temperature-measurement principle and image processing techniques to carry out transformer station's high-voltage contact on-line temperature monitoring.
High-voltage contact on-line temperature monitoring warning system mainly is made up of image acquisition part, data processing section and center control section.The image acquisition part mainly comprises CCD camera and temperature-indicating wax label, is mainly used in the picked-up raw video image.The black type temperature-indicating wax label of leucismus is attached near the high pressure conducting rod in contact, changes so that can react contact temperature truly, apace.Camera is installed in suitable position under the outdoor high voltage electric switch frame, with the temperature variation of on-line monitoring temperature-indicating wax label.Data processing section mainly comprises level adjusting circuit, video conversion switch, synch information extraction circuit, A/D converter, data-carrier store RAM, single-chip microcomputer and auxiliary circuit.Monitor in order to carry out multiple spot simultaneously, thereby make system be easy to networking, the center control section adopts multi-computer communication.But because be subjected to the influence of barrier and Changes in weather very big, have the lower temperature of measuring accuracy simultaneously, this method can not obtain the explicit value of contact temperature.
Can also and utilize optical fiber information transmission technology to realize temperature monitoring under the high voltage environment by the withstand voltage many output high frequency switch powers of height.Convert the aanalogvoltage of reflection temperature to frequency signal through voltage controlled oscillator, be transferred to the CPU element that is in electronegative potential with optical fiber then.Because optical fiber is insulator, thus can not destroy electrical distance, but optical fiber itself fractures easily, need transform existing equipment during installation, causes investment bigger.In addition, light guide approach does not fundamentally break away from the wired connection mode, very likely because reasons such as dust cause high-tension apparatus to meet accident.
The precision of infrared mode is subjected to monitoring that the influence of angle, barrier and surrounding enviroment is very big, and monitoring distance is short, and the reliability of communication is not high.
Therefore, need a kind of temperature and electric current to monitor general-purpose system in real time, be used for temperature and electric current under the on-line monitoring cable connector running state, thus the duty of definite cable connector.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of electric distribution network cable connector running state wireless on-line monitoring system and method, can determine the duty of cable connector by temperature under the monitoring cable connector running state and electric current exactly, wherein, the terminal harvester in the system uses suspension electromagnetic induction formula communication power supply unit to power.
To achieve these goals, according to an aspect of the present invention, the invention provides a kind of wireless on-line monitoring system that is used to monitor electric distribution network cable connector running state, comprise: one or more terminal harvesters, be used under the control of controller, measure the operational factor of the electric distribution network cable connector under the running status, wherein, the terminal harvester is powered by suspension electromagnetic induction formula communication power supply unit; One or more controllers are used to control one or more terminal harvesters, obtain the operational factor of terminal harvester collection and operational factor is transferred to server; And server, be used to handle and analyze the operational factor of self-controller, determine the running status of electric distribution network cable connector and the following running status of prediction electric distribution network cable connector.
Wireless on-line monitoring system also comprises: one or more repeaters, be used for relaying is carried out in the communication between terminal harvester and controller, and the expansion effective communication distance, wherein, interconnected between one or more repeaters.
The terminal harvester comprises: temperature detection and processing unit are used to detect the temperature of electric distribution network cable connector and produce temperature signal, and the temperature signal after temperature signal handled and will handle transfer to microcontroller; Microcontroller is used to handle from the temperature signal of temperature detection and processing unit and/or handles from the current signal of current detecting with the conditioning unit; Wireless communication unit is used for temperature signal and current signal after the microcontroller processing are sent to controller; And suspension electromagnetic induction formula communication power supply unit, be used for inducing voltage from electric distribution network cable, be temperature detection and processing unit and microcontroller power supply.
The terminal harvester also comprises: current detecting and processing unit, be used to detect the electric current of electric distribution network cable connector and produce current signal, current signal after current signal handled and will handle transfers to microcontroller, and by the power supply of suspension electromagnetic induction formula communication power supply unit; And/or the power supply monitoring unit, being used for monitoring in real time the supply voltage of microcontroller, the power supply monitoring unit has house dog, is used for sending reset signal detecting under the situation that voltage is lower than setting value to microcontroller.
Current detecting and processing unit comprise: the current sampling unit, be used for from described high voltage bus induction current, and with described current delivery to the first lightning protection unit; The described first lightning protection unit is used for being subjected under the situation of lightning impulse, absorbs the lightning surge power of described power supply sampling unit; First rectification filtering unit is connected to the described first lightning protection unit, is used for the electric current that described power supply sampling unit induces is carried out rectifying and wave-filtering, produces DC voltage with output; And the first energy bleed off unit, be connected to the output of described first rectification filtering unit, be used under described current/voltage condition with higher, carrying out the energy bleed off.
Wireless communication unit is by near the band transmissions signal the 2.4GHz.
Suspension electromagnetic induction formula communication power supply unit comprises: induction getting can the unit, and the mode that is used for by electromagnetic induction induces electric current and the electric current that induces is handled from high voltage bus, with the output stabilized voltage supply; And control dividing cell, being connected to induction getting can the unit and carry out electromagnetic coupled with high voltage bus, be used under the excessive situation of the bus current on the high voltage bus, share the induction energy that the energy unit induces of getting, to reduce the induction electric current that the energy unit induces of getting.
Induction getting can the unit comprises: power supply is got can the unit, be used for from the high voltage bus induction current, and with current delivery to the lightning protection unit; The lightning protection unit is used for being subjected under the situation of lightning impulse, absorbs the lightning surge power that power supply is got the energy unit; Rectification filtering unit is connected to the lightning protection unit, is used for that power supply is got the electric current that can the unit induces and carries out rectifying and wave-filtering, produces DC voltage; The voltage regulation filtering unit is connected to rectification filtering unit, is used for the direct current of rectification filtering unit output is carried out the voltage regulation filtering processing, and the output of the direct current after will handling; And energy bleed off unit, be connected to the output of rectification filtering unit, be used under the current/voltage condition with higher, carrying out the energy bleed off, be input to the voltage of filter circuit of pressure-stabilizing with reduction.
The control dividing cell comprises: control module, be connected to the output of rectification filtering unit, and be used under the excessive situation of the electric current of rectification filtering unit output, dividing cell being started working; And dividing cell, be used under the control of control module, beginning to carry out work, share the energy that power supply is got the energy unit, the electric current that reduces to induce.
Suspension electromagnetic induction formula communication power supply unit begin to provide the general power output more than or equal to 200mW, and each road voltage ripple is smaller or equal to 20mV under the situation of high voltage bus current greater than 10A.
According to a further aspect in the invention, a kind of wireless online monitoring method that is used to monitor electric distribution network cable connector running state also is provided, may further comprise the steps: step S602, under the control of controller, one or more terminal harvesters are measured the operational factor of the electric distribution network cable connector under the running status at the diverse location of electric distribution network cable connector, and parameter transferred to one or more controllers, wherein, one or more terminal harvesters are by the power supply of suspension electromagnetic induction formula communication power supply unit; Step S604, controller obtain operational factor and operational factor are transferred to server; And step S606, the server process analysis comes the operational factor of self-controller, determines the running status of electric distribution network cable connector and the following running status of prediction electric distribution network cable connector.
One or more terminal harvesters are sent to controller by one or more repeaters with operational factor, and are wherein, interconnected between one or more repeaters.
Step S602 comprises: step S602-2a, the temperature that the temperature detection of terminal harvester and processing unit detect electric distribution network cable connector also produces temperature signal, and the temperature signal after temperature signal handled and will handle transfers to the microcontroller of terminal harvester; Step S602-4, microcontroller is handled the signal that receives and is handled, and the temperature signal after will handling transfers to the wireless communication unit of terminal harvester; Step S502-6, wireless communication unit is sent to controller with temperature signal; Wherein, temperature detection and processing unit, microcontroller and wireless communication unit are by the power supply of suspension electromagnetic induction formula communication power supply unit.
Step S602 also comprises: step S602-2b, and the current detecting of terminal harvester and processing unit detect the electric current of electric distribution network cable connector and produce current signal, and the current signal after current signal is handled and will be handled transfers to microcontroller.
Detecting under the situation that voltage is lower than setting value, the power supply monitoring unit of terminal harvester sends reset signal to microcontroller.Wireless communication unit is by near the band transmissions signal the 2.4GHz.
Suspension electromagnetic induction formula communication power supply unit powers by following steps: step S802, and suspension electromagnetic induction formula communication power supply unit becomes little electric current with the big current conversion on the electric distribution network cable; Step S804, suspension electromagnetic induction formula communication power supply unit carries out rectification and filtering to little electric current; And step S806, suspension electromagnetic induction formula communication power supply unit carries out voltage stabilizing to the electric current through overcommutation and filtering and the power supply after the voltage stabilizing is exported to power.
Under the situation of electric distribution network cable electric current greater than 10A, suspension electromagnetic induction formula communication power supply unit begins to provide the general power output more than or equal to 200mW, and each road voltage ripple is smaller or equal to 20mV.
Pass through technique scheme, the present invention realizes a kind of novel universal system that is used for electric distribution network cable connector temperature and the real-time monitoring of electric current, temperature under the on-line monitoring electric distribution network cable connector running state and electric current, thereby determine the duty of electric distribution network cable connector, to improve the security and the reliability of power distribution network operation, the power transmission and distribution ability of excavating power equipment.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the block diagram according to wireless on-line monitoring system of the present invention;
Fig. 2 is the synoptic diagram according to the terminal harvester of wireless online detection system of the present invention;
Fig. 3 is the synoptic diagram according to the suspension electromagnetic induction formula communication power supply unit of wireless on-line monitoring system of the present invention;
Fig. 4 is the synoptic diagram according to controller of the present invention;
Fig. 5 is the synoptic diagram according to the current sampling unit of wireless on-line monitoring system of the present invention;
Fig. 6 is the process flow diagram according to wireless online monitoring method of the present invention;
Fig. 7 is according to the further process flow diagram of step S602 in the wireless online monitoring method of the present invention;
Fig. 8 is the treatment step of powering according to suspension electromagnetic induction formula communication power supply of the present invention unit; And
Fig. 9 is the networking synoptic diagram according to wireless on-line monitoring system of the present invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
Fig. 1 is the block diagram according to wireless on-line monitoring system of the present invention.With reference to Fig. 1, according to the wireless on-line monitoring system that is used to monitor electric distribution network cable connector running state of the present invention, comprise: one or more terminal harvesters 102, be used under the control of controller, measure the operational factor of the electric distribution network cable connector under the running status at the diverse location of electric distribution network cable connector; Controller 104 is used to control one or more terminal harvesters, obtains the operational factor of terminal harvester collection and operational factor is transferred to server; And server 106, be used to handle and analyze the operational factor of self-controller, determine the running status of electric distribution network cable connector and the following running status of prediction electric distribution network cable connector.
Wireless on-line monitoring system can also comprise repeater, is used for relaying is carried out in the communication between terminal harvester and controller, and is with the expansion effective communication distance, wherein, interconnected between one or more repeaters.Repeater is made up of microprocessing unit, wireless communication unit, Power Management Unit, house dog and power supply supervision unit.Repeater does not possess the CAN interface and the RS485 interface function of controller, can directly be substituted by controller yet.
Wherein, the terminal harvester is installed in electric distribution network cable connector, is used to measure the temperature of electric distribution network cable connector under the running status and the load current by electric distribution network cable connector.
Controller is finished the measurement of data, and data are calculated, analyze, store and manage, finish monitoring to electric distribution network cable connector temperature and electric current, determine the work at present state of electric distribution network cable connector, the running status trend of prediction electric distribution network cable connector, instant discovery, diagnosis, precognition connector hot stall.
Preferably, the wireless communication unit of wireless on-line monitoring system can be by near the band transmissions signal the 2.4GHz.
Fig. 2 is the synoptic diagram according to the terminal harvester of wireless online detection system of the present invention.As shown in Figure 2, the terminal harvester 102 of wireless on-line monitoring system comprises: temperature detection and processing unit 102-2, be used to detect the temperature of electric distribution network cable connector and produce temperature signal, and the temperature signal after temperature signal handled and will handle transfers to microcontroller; (MicroController Unit, MCU) 102-4 are used to handle from the temperature signal of temperature detection and processing unit and/or handle from the current signal of current detecting with the conditioning unit microcontroller; Wireless communication unit 102-6 is used for temperature signal and current signal after the microcontroller processing are sent to controller; And suspension electromagnetic induction formula communication power supply unit 102-8, be used for inducing voltage from electric distribution network cable, be temperature detection and processing unit and microcontroller power supply.
The terminal harvester also comprises: current detecting and processing unit 102-10, be used to detect the electric current of electric distribution network cable connector and produce current signal, current signal after current signal handled and will handle transfers to microcontroller, and by the power supply of suspension electromagnetic induction formula communication power supply unit.
The terminal harvester of wireless on-line monitoring system can also comprise: power supply monitoring unit 102-12, be used for monitoring in real time the supply voltage of microcontroller, the power supply monitoring unit has house dog, is used for sending reset signal to microcontroller detecting under the situation that voltage is lower than setting value.
The terminal harvester is the collection of finishing temperature and current data under the control of controller, adopts the mode of poll to finish data transmission.
Suspension electromagnetic induction formula communication power supply adopts the electromagnetic coupled mode that the big electric current on the electric distribution network cable is become little electric current by Small-sized C T, through rectifying and wave-filtering, again by power module voltage stabilizing output.This power supply can be in cable current during greater than 10A; promptly begin all not to be higher than 20mV for the high-pressure side communicator provides general power output and each road voltage ripple of being not less than 200mW; can satisfy power consumption and the voltage request of general measure with electronic circuit; and can when breaking down big electric current, the electric distribution network cable electric current give power circuit and back end electronics with protection.This power supply architecture is simple, use is reliable, cost is low.
Fig. 3 is the synoptic diagram according to the suspension electromagnetic induction formula communication power supply unit of wireless on-line monitoring system of the present invention.As shown in Figure 3, the suspension electromagnetic induction formula communication power supply unit 102-8 of wireless on-line monitoring system comprises: the induction energy unit 302 of getting, the mode that is used for by electromagnetic induction induces electric current and the electric current that induces is handled from high voltage bus, with the output stabilized voltage supply; And control dividing cell 304, being connected to induction getting can the unit and carry out electromagnetic coupled with high voltage bus, be used under the excessive situation of the bus current on the high voltage bus, share the induction energy that the energy unit induces of getting, to reduce the induction electric current that the energy unit induces of getting.
Wherein, induction get can unit 302 comprise that power supply is got can unit 302-2, lightning protection unit 302-4, rectification filtering unit 302-6, voltage regulation filtering unit 302-8 and energy bleed off unit 302-10.Control dividing cell 304 comprises control module 304-2, dividing cell 304-4.
In this device power supply get can the unit be electromagnetic induction coil, dividing cell is an electromagnetic induction coil, these two coils are selected same magnetic core for use, and the microcrystallizing alloy material that this magnetic core is lower by saturation induction density, magnetoconductivity is higher is made (can according to circumstances select permeability magnetic materials such as siliconized plate, permalloy to make iron core).When magnetic core was in unsaturated state, the voltage of induction changed apparent in view with the high voltage cable electric current, easily can produce the electric energy that satisfies system requirements by circuit for getting under little current conditions.
When high voltage cable electric current variation range was bigger, magnetic core was in state of saturation, and it is very little to make that induced voltage changes.The C sections core that is shaped as two band nuts of iron core; with energy supply coil/control coil and rectification filtering voltage stabilizing circuit; control circuit and lightning protection circuit are fixed on the C sections core of a side, and carry out plastic packaging, dock to install with the C sections core of the no coil of another plastic packaging and circuit and both can.
According to electromagnetic induction principle, determine the number of turn of coil, stable 3.3V voltage output can be provided when guaranteeing bus current for 10A.The energy supply coil is responded to certain energy by electromagnetic induction from high voltage cable, and its output is connected to rectification filtering voltage stabilizing circuit after taking over control the thunder holding circuit, thereby DC voltage-stabilizing work power supply is provided.
Because high-tension cable Up Highway UHW electric current variation range is big, and transient current also will keep power supply stable when the rated current that reaches tens of times, such as rated current 1000A on the 110kV bus, power supply can also operate as normal when reaching 100kA will to guarantee electric current.The iron core of inductive coil was in the magnetic saturation state when bus current was excessive.Behind the core sataration, magnetization curve is nonlinear relationship, and induced potential becomes similar pulsating wave, causes that the power module of voltage regulation input voltage is too high to be burnt, and is unfavorable for the realization of power supply.The present invention has increased control winding and a divided circuit, and is excessive when bus current, obtains energy when too much, and the coil-induced voltage of control energy supply is in suitable working range.
It is different with the maximum current of divided circuit to consider that power supply is got the energy circuit, can adopt the not enameled wire in collinear footpath, calculates the required number of turn according to Theory of Electromagnetic Field and transformer formula, and considers that the experimental applications situation suitably increases and decreases.
Lightning protection unit 302-4 is used for being subjected under the situation of lightning impulse, absorbs the lightning surge power that power supply is got the energy unit.This lightning protection circuit has adopted transition to suppress diode (TVS); TVS is a kind of high-effect protection device of diode form; have the advantages that response speed is fast, transient power is big, leakage current is little; it can be when lightning impulse changes the high impedance at the two poles of the earth into Low ESR with the speed of 10-12s magnitude; make the two poles of the earth voltage clamp on selective value; sponge lightning surge power, avoid damaging because of lightning impulse causes power circuit.
Rectification filtering unit 302-6 is connected to the lightning protection unit, is used for that power supply is got the electric current that can the unit induces and carries out rectifying and wave-filtering, produces DC voltage.
Bridge rectifier is adopted in rectification, provides power supply for the high-pressure side communicator after filtering circuit connects mu balanced circuit.The ac input end of rectification circuit connects the energy supply coil, is converted to direct current with getting the alternating current that can coil induces, and its oppositely withstand voltage maximum output voltage that provides greater than coil will be provided the rectifier bridge device.Filtering circuit is used for the ripple of elimination rectifier output voltage, the employing patch capacitor carries out filtering and circuit board is reasonably connected up, and suitably add the device that filter capacitor, magnetic bead etc. can reduce electromagnetic interference (EMI) according to the circuit debugging situation, make ripple control within desirable scope.The electric energy of responding to from high voltage cable becomes direct current behind current rectifying and wave filtering circuit.
Mu balanced circuit is taked the bigger voltage stabilizing chip of input voltage range, and will design holding circuit and step-down isolating device at the voltage stabilizing input end, in order to avoid burn the voltage stabilizing chip.
Voltage regulation filtering unit 302-8 is connected to rectification filtering unit, is used for the direct current of rectification filtering unit output is carried out the voltage regulation filtering processing, and the output of the direct current after will handling.Handtailor coil induces alternating current and process full-wave rectification bridge rectification and capacitor filtering from bus after, just can consider that the wide region direct current that will obtain is imported by one, the voltage-stabilizing device of single stable output obtains a stable 3.3V voltage (according to rear end metering circuit requirement on a large scale, can choose different voltage-stabilizing devices, obtain different output dc voltages, as 5V).In this circuit, the input voltage of voltage stabilizing chip is controlled at 4.3V-16V by shunt coil, and it is output as the 3.3V D.C. regulated power supply.And connect C7, C8 high frequency capacitance, reduce of the influence of voltage stabilizing chip to power supply.
Energy bleed off unit 302-10 is connected to the output of rectification filtering unit, is used for carrying out the energy bleed off under the current/voltage condition with higher, is input to the voltage of filter circuit of pressure-stabilizing with reduction.
In this suspension electromagnetic induction formula communication power supply unit, commutating voltage is higher, is the power regulator spare of protection rear end, adopts the voltage stabilizing diode of several parallel connections and a resistance to form the energy leadage circuit.When commutating voltage was low, the energy leadage circuit was not worked, and therefore at the high voltage cable electric current hour, can not influence the input voltage of back-end circuit; When commutating voltage was higher, the energy leadage circuit was started working, and therefore when the high voltage cable electric current is big, can reduces the input voltage of back-end circuit and be protected back-end circuit.
Because power system load alters a great deal, bus or line current variation range very big (several peace to thousands of peaces), bigger electric current variation range make that designing the stabilized voltage supply difficulty strengthens.Therefore design control divided circuit is so that provide the main circuit of power supply reliablely and stablely to work to high-end electronic circuit, the core devices of circuit is a bidirectional triode thyristor, utilize the unlatching of the function control shunt coil of its zero-crossing switching to turn-off, when get can coil induction electric energy when excessive, voltage stabilizing chip input terminal voltage raises, controllable silicon conducting, shunt coil work, and then the electric energy of getting the induction of energy coil reduces the reduction of voltage stabilizing chip input terminal voltage.
In the present invention, special small current mutual inductor (CT) utilizes electromagnetic induction directly to obtain energy from high voltage power cable.This power supply provides power supply to the high-pressure side checkout equipment on the spot, and volume is little, in light weight, and reliability height, cost are also lower.
Suspension electromagnetic induction formula communication power supply of the present invention unit satisfies the safe handling requirement that high-voltage electrical apparatus is isolated.At solving the bus current wide variation, can adopt compensating coil, carry out the magnetic circuit compensation, unnecessary magnetic potential is turned back to bus.
The high voltage cable electric current is in the wide region of 10A～1000A, and suspension electromagnetic induction formula communication power supply of the present invention unit can provide the 3.3V constant voltage dc source of the general power output that is not less than 200mW, and each road voltage ripple all is not higher than 20mV.
In this device, commutating voltage is higher, is the power regulator spare of protection rear end, adopts the voltage stabilizing diode of several parallel connections and a resistance to form the energy leadage circuit.When commutating voltage was low, the energy leadage circuit was not worked, and therefore at the high voltage cable electric current hour, can not influence the input voltage of back-end circuit; When commutating voltage was higher, the energy leadage circuit was started working, and therefore when the high voltage cable electric current is big, can reduces the input voltage of back-end circuit and be protected back-end circuit.
The present invention has increased shunting winding and a control circuit, and is excessive when bus current, obtains energy when too much, and the coil-induced voltage of control energy supply is in suitable working range.Adopt the core devices of bidirectional triode thyristor as control circuit.
Suspension electromagnetic induction formula communication power supply of the present invention unit has passed through a large amount of test of testing laboratory, and is stable, reliable, at Yuci Utilities Electric Co. installation and operation, obtained good effect at present
Micro controller unit is as the core of terminal harvester, can constitute by general microcontroller and other devices more than 8 or 16 s' the 0.5MIPS, and be the antijamming capability that improves system, can select the microcontroller of built-in house dog and dormant mode support.
Wireless communication unit adopts and works in 2.4GHz frequency range closely micro power consumption wireless transceiving chip nRF24L01 and peripheral circuit composition thereof, and is connected with micro controller unit by serial line interface.2.4G be the ISM band of global general-use, need not frequency application, the also design of convenient antenna.NRF24L01 not only supports high speed data transfer, and also embedded ANT agreement is supported wireless networking.
Temperature sensing and detecting unit adopt integrated temperature sensor to add formations such as amplification, filtering and impedance matching circuit, for analog temperature sensor, through the A/D converter that voltage signal is delivered to independently or microcontroller is built-in after the conditioning, for digital temperature sensor, can with microcontroller between be connected by serial line interface.
The position voltage signal is changed by the current value that minitype CT will flow through connector in current sense and signal condition unit, through the A/D converter of delivering to independently after amplification, filtering and the impedance matching or microcontroller is built-in.
Power supply monitoring unit with house dog; can form by power monitoring chip and the peripheral circuit thereof of band house dog; this unit is monitored the supply voltage of microcontroller in real time; when detected magnitude of voltage is lower than setting value; send reset signal to microcontroller, play the effect that improves measuring accuracy and protection terminal.The regular zero clearing house dog of microcontroller.
Fig. 4 is the synoptic diagram according to controller of the present invention.As shown in Figure 4, controller is made up of micro controller unit 402, wireless communication unit 404, RS232 interface unit 406, RS485 interface unit 408, Power Management Unit 410, house dog and power supply supervision unit 412.Power supply is provided through Power Management Unit by external direct supply.
Wherein, micro controller unit 402 can be made of general microcontroller and other devices more than 8 or 16 s' the 0.5MIPS, is the stability that improves system, can select the microcontroller of built-in house dog.
Wireless communication unit 404 adopts and works in 2.4GHz frequency range closely micro power consumption wireless transceiving chip and peripheral circuit composition thereof, and is connected with micro controller unit by synchronous serial interface.
The RS485 interface unit connects microcontroller by 485 Bus Interface Chips.RS232 interface unit (circuit as shown in figure 12) connects microcontroller by 232 interface level conversion chips.RS232 interface and RS485 interface can be selected one of two kinds of interfaces by toggle switch.
Power Management Unit 410 provides power supply through step-down, rectification, filtering and voltage stabilizing for other unit with external 220V AC power.
House dog and power supply monitoring unit 412; can be made up of power monitoring chip and the peripheral circuit thereof of band house dog, this unit is monitored the supply voltage of microcontroller in real time, when detected magnitude of voltage is lower than setting value; send reset signal to microcontroller, play the effect of protection equipment.The regular zero clearing house dog of microcontroller.
In technique scheme, at outdoor installation situation, can use sun-generated electric power to substitute induction power supply, but have cost height, problem that maintenance is big.Except that using the 2.4GHz radio band, also can use the wireless communication technology of other frequency range, but when emissive power is big, may relate to the problem of frequency range application.
In the such scheme, micro controller unit and wireless communication unit can be substituted by the 2.4G radio transmitting and receiving chip of embedding microcontroller and the element circuit that peripheral circuit is formed thereof.
Fig. 5 is the synoptic diagram according to current sampling of the present invention and processing unit.As shown in Figure 4, current detecting and processing unit comprise: current sampling unit 502, be used for from described high voltage bus induction current, and with described current delivery to the first lightning protection unit; The described first lightning protection unit 504 is used for being subjected under the situation of lightning impulse, absorbs the lightning surge power of described power supply sampling unit; First rectification filtering unit 506 is connected to the described first lightning protection unit, is used for the electric current that described power supply sampling unit induces is carried out rectifying and wave-filtering, produces DC voltage with output; And the first energy bleed off unit 508, be connected to the output of described first rectification filtering unit, be used under described current/voltage condition with higher, carrying out the energy bleed off.
In this device power supply get can coil, control shunt coil and current sampling coil select same magnetic core for use, extracts the high voltage cable current signal by this coil, the testing circuit by the rear end obtains bus current, current error is in ± 3A.
Fig. 6 is the process flow diagram according to wireless online monitoring method of the present invention.With reference to Fig. 6, according to the wireless online monitoring method that is used to monitor electric distribution network cable connector running state of the present invention, may further comprise the steps: step S602, under the control of controller, one or more terminal harvesters are measured the operational factor of the electric distribution network cable connector under the running status, and parameter transferred to controller, wherein, one or more terminal harvesters are by the power supply of suspension electromagnetic induction formula communication power supply unit; Step S604, controller obtain operational factor and operational factor are transferred to server; And step S606, the server process analysis comes the operational factor of self-controller, and the following running status of the running status of definite electric distribution network cable connector and prediction electric distribution network cable connector.Wherein, operational factor comprises temperature and/or electric current.
Wherein, one or more terminal harvesters can be sent to controller with operational factor by repeater.
Fig. 7 is according to the further process flow diagram of step S602 in the wireless online monitoring method of the present invention.As shown in Figure 7, step S602 can also comprise: step S602-2a, the temperature detection of terminal harvester and processing unit detect the temperature of electric distribution network cable connector and produce temperature signal, and the temperature signal after temperature signal handled and will handle transfers to the microcontroller of terminal harvester, also can execution in step S602-2b in execution in step S602-a, the current detecting of terminal harvester and processing unit detect the electric current of electric distribution network cable connector and produce current signal, and the current signal after current signal is handled and will be handled transfers to microcontroller; Step S602-4, microcontroller is handled the signal that receives and is handled, and the temperature signal after will handling transfers to the wireless communication unit of terminal harvester; Step S602-6, wireless communication unit is sent to server with temperature signal; Wherein, temperature detection and processing unit, microcontroller and wireless communication unit are by the power supply of suspension electromagnetic induction formula communication power supply unit.
Detecting under the situation that voltage is lower than setting value, the power supply monitoring unit of terminal harvester can send reset signal to microcontroller.Wireless communication unit preferably by near the band transmissions signal the 2.4GHz, also can pass through other band transmissions.
Fig. 8 is the treatment step of powering according to suspension electromagnetic induction formula communication power supply of the present invention unit.As shown in Figure 8, may further comprise the steps: step S802, the current transformation unit of suspension electromagnetic induction formula communication power supply unit becomes little electric current with the big current conversion on the electric distribution network cable; Step S804, the current rectifying and wave filtering circuit of suspension electromagnetic induction formula communication power supply unit carries out rectification and filtering to little electric current; And step S806, the power supply stabilization circuit of suspension electromagnetic induction formula communication power supply unit carries out voltage stabilizing to the electric current through overcommutation and filtering and the electric current after the voltage stabilizing is exported to power.
In the wireless online monitoring method, under the situation of electric distribution network cable electric current greater than 10A, suspension electromagnetic induction formula communication power supply unit begins to provide the general power output more than or equal to 200mW, and each road voltage ripple is smaller or equal to 20mV.
The present invention can on-line monitoring electric distribution network cable connector running temperature and electric current, and then the running status of definite electric distribution network cable.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1. wireless on-line monitoring system that is used to monitor electric distribution network cable connector running state comprises:
One or more terminal harvesters are used under the control of controller, measure the operational factor of the electric distribution network cable connector under the running status, and wherein, described terminal harvester is powered by suspension electromagnetic induction formula communication power supply unit;
One or more controllers are used to control described one or more terminal harvester, obtain the described operational factor of described terminal harvester collection and described operational factor is transferred to server; And
Described server is used to handle and analyze the described operational factor from described controller, determines the running status of described electric distribution network cable connector and predicts the following running status of described electric distribution network cable connector.
2. wireless on-line monitoring system according to claim 1 is characterized in that, described wireless on-line monitoring system also comprises:
One or more repeaters are used for relaying is carried out in the communication between described terminal harvester and described controller, and the expansion effective communication distance is wherein, interconnected between described one or more repeaters.
3. wireless on-line monitoring system according to claim 1 and 2 is characterized in that, described terminal harvester comprises:
Temperature detection and processing unit are used to detect the temperature of described electric distribution network cable connector and produce temperature signal, and the temperature signal after described temperature signal handled and will handle transfers to microcontroller;
Described microcontroller is used to handle from the temperature signal of described temperature detection and processing unit and/or handles from the current signal of current detecting with the conditioning unit;
Wireless communication unit is used for temperature signal and described current signal after the described microcontroller processing are sent to described controller; And
Suspension electromagnetic induction formula communication power supply unit is used for inducing voltage from electric distribution network cable, is described temperature detection and processing unit and the power supply of described microcontroller.
4. wireless on-line monitoring system according to claim 3 is characterized in that, described terminal harvester also comprises:
Current detecting and processing unit, be used to detect the electric current of described electric distribution network cable connector and produce current signal, current signal after described current signal handled and will handle transfers to described microcontroller, and powers by described suspension electromagnetic induction formula communication power supply unit; And/or
The power supply monitoring unit is used for monitoring in real time the supply voltage of described microcontroller, and described power supply monitoring unit has house dog, is used for sending reset signal detecting under the situation that described voltage is lower than setting value to described microcontroller.
5. wireless on-line monitoring system according to claim 3 is characterized in that, described wireless communication unit is by near the band transmissions signal the 2.4GHz.
6. wireless on-line monitoring system according to claim 3 is characterized in that, described suspension electromagnetic induction formula communication power supply unit comprises:
Induction getting can the unit, and the mode that is used for by electromagnetic induction induces electric current and the electric current that induces is handled from described high voltage bus, with the output stabilized voltage supply; And
The control dividing cell, being connected to described induction getting can the unit and carry out electromagnetic coupled with described high voltage bus, be used under the excessive situation of the bus current on the described high voltage bus, share the described induction energy that the energy unit induces of getting, to reduce the described induction electric current that the energy unit induces of getting.
7. wireless on-line monitoring system according to claim 3 is characterized in that, described induction getting can comprise the unit:
Power supply is got can the unit, be used for from described high voltage bus induction current, and with described current delivery to the lightning protection unit;
Described lightning protection unit is used for being subjected under the situation of lightning impulse, absorbs the lightning surge power that described power supply is got the energy unit;
Rectification filtering unit is connected to described lightning protection unit, is used for that described power supply is got the electric current that can the unit induces and carries out rectifying and wave-filtering, produces DC voltage;
The voltage regulation filtering unit is connected to described rectification filtering unit, is used for the direct current of described rectification filtering unit output is carried out the voltage regulation filtering processing, and the output of the direct current after will handling; And
Energy bleed off unit is connected to the output of described rectification filtering unit, is used for carrying out the energy bleed off under described current/voltage condition with higher, is input to the voltage of described filter circuit of pressure-stabilizing with reduction.
8. wireless on-line monitoring system according to claim 6 is characterized in that, described control dividing cell comprises:
Control module is connected to the output of described rectification filtering unit, is used under the excessive situation of the electric current of described rectification filtering unit output dividing cell being started working; And
Described dividing cell is used for beginning to carry out work under the control of described control module, shares the energy that described power supply is got the energy unit, the electric current that reduces to induce.
9. wireless on-line monitoring system according to claim 4 is characterized in that, described current detecting and processing unit comprise:
The current sampling unit is used for from described high voltage bus induction current, and with described current delivery to the first lightning protection unit;
The described first lightning protection unit is used for being subjected under the situation of lightning impulse, absorbs the lightning surge power of described power supply sampling unit;
First rectification filtering unit is connected to the described first lightning protection unit, is used for the electric current that described power supply sampling unit induces is carried out rectifying and wave-filtering, produces DC voltage with output; And
The first energy bleed off unit is connected to the output of described first rectification filtering unit, is used for carrying out the energy bleed off under described current/voltage condition with higher.
10. according to each described wireless on-line monitoring system in the claim 1 to 9, it is characterized in that, described suspension electromagnetic induction formula communication power supply unit is under the situation of high voltage bus current greater than 10A, begin to provide general power output, and each road voltage ripple is smaller or equal to 20mV more than or equal to 200mW.
11. a wireless online monitoring method that is used to monitor electric distribution network cable connector running state may further comprise the steps:
Step S602, under the control of controller, one or more terminal harvesters are measured the operational factor of the described electric distribution network cable connector under the running status at the diverse location of electric distribution network cable connector, and described parameter transferred to one or more controllers, wherein, described one or more terminal harvester is by the power supply of suspension electromagnetic induction formula communication power supply unit;
Step S604, described controller obtain described operational factor and described operational factor are transferred to server; And
Step S606, described server process analysis is from the described operational factor of described controller, determines the running status of described electric distribution network cable connector and predicts the following running status of described electric distribution network cable connector.
12. wireless online monitoring method according to claim 11, it is characterized in that, described one or more terminal harvester is sent to described controller by one or more repeaters with described operational factor, and is wherein, interconnected between described one or more repeaters.
13. wireless online monitoring method according to claim 11 is characterized in that, described step S602 comprises:
Step S602-2a, the temperature detection of described terminal harvester and processing unit detect the temperature of described electric distribution network cable connector and produce temperature signal, and the temperature signal after described temperature signal handled and will handle transfers to the microcontroller of described terminal harvester;
Step S602-4, described microcontroller is handled the signal that receives and is handled, and the temperature signal after will handling transfers to the wireless communication unit of described terminal harvester;
Step S602-6, described wireless communication unit is sent to described controller with described temperature signal;
Wherein, described temperature detection and processing unit, described microcontroller and described wireless communication unit are by the power supply of suspension electromagnetic induction formula communication power supply unit.
14. wireless online monitoring method according to claim 13, it is characterized in that, described step S602 also comprises: step S602-2b, the current detecting of described terminal harvester and processing unit detect the electric current of described electric distribution network cable connector and produce current signal, and the current signal after described current signal is handled and will be handled transfers to described microcontroller.
15. wireless online monitoring method according to claim 13 is characterized in that, is detecting under the situation that described voltage is lower than setting value, the power supply monitoring unit of described terminal harvester sends reset signal to described microcontroller.
16., it is characterized in that described wireless communication unit is by near the band transmissions signal the 2.4GHz according to claim 14 or 15 described wireless online monitoring methods.
17., it is characterized in that described suspension electromagnetic induction formula communication power supply unit powers by following steps according to claim 14 or 15 described wireless online monitoring methods:
Step S802, described suspension electromagnetic induction formula communication power supply unit becomes little electric current with the big current conversion on the electric distribution network cable;
Step S804, described suspension electromagnetic induction formula communication power supply unit carries out rectification and filtering to described little electric current; And
Step S806, described suspension electromagnetic induction formula communication power supply unit carries out voltage stabilizing to the electric current through overcommutation and filtering and the power supply after the voltage stabilizing is exported to power.
18. wireless online monitoring method according to claim 17, it is characterized in that, under the situation of electric distribution network cable electric current greater than 10A, described suspension electromagnetic induction formula communication power supply unit begins to provide the general power output more than or equal to 200mW, and each road voltage ripple is smaller or equal to 20mV.
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| CNB2006101377250A CN100520845C (en) | 2006-10-26 | 2006-10-26 | Wireless on-line monitoring system and method with electric distribution network cable connector running state |
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| CNB2006101377250A CN100520845C (en) | 2006-10-26 | 2006-10-26 | Wireless on-line monitoring system and method with electric distribution network cable connector running state |
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| CN100520845C CN100520845C (en) | 2009-07-29 |
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