CN106896300B - The monitoring device of power cable connector temperature and PD parameter - Google Patents

The monitoring device of power cable connector temperature and PD parameter Download PDF

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Publication number
CN106896300B
CN106896300B CN201710028196.9A CN201710028196A CN106896300B CN 106896300 B CN106896300 B CN 106896300B CN 201710028196 A CN201710028196 A CN 201710028196A CN 106896300 B CN106896300 B CN 106896300B
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foot
module
amplifier
resistance
temperature
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CN106896300A (en
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李牧
徐立
黄懿明
吴明光
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Abstract

The present invention discloses the temperature and the two-parameter monitoring device of PD of a kind of power cable connector.Device is made of temperature measurement unit, combined electrical source unit, PD measuring unit, MCU Main Processing Unit and WiFi/2G/3G/4G multichannel unit.WiFi/2G/3G/4G multichannel unit automatically selects network according to the wireless signal situation of monitoring device installation point.Two-parameter monitoring helps to find the failure symptom of cable, realizes fault pre-alarming;Digital temperature sensor improves the reliability and consistency of measurement by pre-buried and redundancy specification mounting technique inside connector.Opening car coat type structure takes energy CT coil and overvoltage protection and impact protection circuit, improves the reliability that induction takes power supply;Induction takes power supply+lithium battery backup power source to constitute modular power supply, and combined electrical source structure is simple, reliable performance.

Description

The monitoring device of power cable connector temperature and PD parameter
Technical field
The invention belongs to the technology scopes of power cable monitoring device;Particularly relate to the temperature and PD of acquisition power cable connector Pre-buried and redundancy specification mounting technique inside two-parameter, temperature sensor application connector passes through WiFi/2G/3G/4G multichannel mould Block transmission data, induction take electricity+lithium battery associating power supply monitoring device.
Background technique
Can the reliability of power grid power supply is related to production go on smoothly, the fine or not superiority and inferiority of quality of the life.As power grid covers The expansion of lid range, the negative effect with caused by of failure affected area are increasing.On August 14th, 2003, America & Canada It experienced large area blackout, power failure 29 hours, disaster-stricken number more than 5,000 ten thousand;On July 30th, 2012, India meet with special It is once available without electricity up to 3.7 hundred million, about 1/3 Indians to influence number for massive blackout.January 10~2 month 2 days in 2008, China There are four rare freezing disasters in succession in southern area;Ice disaster causes 36740 10kV and the above power circuit, 1743 Seat substation stops transport, more than 100,000,000 population power failures;National grid loses 104.5 hundred million yuan, and center is directly under electricity power enterprise's loss 613 Hundred million yuan.The reliability of power supply is related to the reliability of power generation department, transmission of electricity department and three, distribution department, wherein city power distribution field Reliability be heavily dependent on the reliability of power cable.
By taking the city tier 2 cities X as an example, the long 600m of 10kV power cable of the city X laying, it is contemplated that the need of O&M, about 300m are set One cable connector;For the difficulty for reducing technology and construction, power cable connector is installed in service cable distribution box.Distribution box It is a kind of indoor or outdoor installation, is usually mounted to curbside, roadside or cell, cable run is tapped, branch, connecting Or conversion, play the part of the role that electric energy collects with distributes hinge.It is stepped into power cable ownership cumulative year after year, early stage cabling Or approach under the double factor promotion of end of life, 2012~2014 years city X cable number of faults rise situation, statistics in apparent Data are shown in Table 1.It must be noted that the non-case special case in the city X, the status of China big and medium-sized cities power cable is similar, and situation is very It is severe.The common recognition of industry peer is: in the quite a while, the high number of faults of power cable by be power industry new normality; The border Embarrassing of power cable makes the reliability of electric system encounter unprecedented challenge.
The power cable fault data in 1 2012~2014 years cities X of table
Time 2012 2013 2014
Power cable fault number (secondary) 513 604 723
Opposite 2012 ratio 100% 117.7% 140.9%
Cable connector is component part indispensable in cable run;According to the difference of connecting object, cable connector is again Cable terminal or cable mid head, the technical term of the two is claimed to be referred to as cable accessory.It is ground connection outside conductive cable cores Copper shield forms radial distribution electric field between conductor wire core and shielded layer.The electric field of normal cable is only from core along radius To the power line of copper shield, the not no axial electric field (power line) of core, field distribution is uniform.It is peelled off when making end Shielded layer destroys cable field distribution, generates to the unfavorable tangential electric field (axial power line) that insulate -- peelling off shielded layer Core at power line to shielded layer incision position concentrate, incision position is exactly the most easily breakdown position of cable.Cable connector housing It is effective that dress electric stress pipe, which inhibits tangential electric field, but cable connector is still the weak link of cable power grid.Statistics shows: Joint fault number is in the 90% of cable total failare number.Therefore, it is necessary to monitor the operating status of power cable connector on-line; On-line monitoring helps to find that failure and failure symptom, discovery failure symptom are timely maintenance, exclude cable fault in advance, promoted The premise of O&M level.The design specifications of on-line monitoring cable connector state should include: monitoring parameters acquire monitoring parameters Technology path obtains the approach of electric energy and acquires the transmission method of data.
Non-electrical parameter temperature is the mandatory parameter of cable connector on-line monitoring.Temperature increases, and the contact resistance of connector increases Add, aoxidize acceleration;Dielectric temperature increases (resistance value has negative temperature coefficient), and the electric current for flowing through dielectric is caused to increase Greatly, i.e., the power consumption of medium, calorific value increase, and the accelerated ageing of dielectric is facilitated even to puncture.Temperature measurement has contact, non- Contact two major classes;And contact temperature-measuring segment out point type (thermocouple, thermal resistance, thermistor, digital temperature sensor), Two kinds of wire type (temperature sensing cable, distributed optical fiber temperature sensor, fiber grating temperature sensor).From technical maturity, easy-to-use Property and the synthesis visual angle of economic indicator consider, industry is inclined to the digital temperature sensor of point contact;But digital temperature sensor makes Three point defects are exposed in, should divide folding reason and corresponding technological means is taken to remedy.Firstly, the temperature data of measurement is consistent Property is not good enough;Source is the surface temperature of connector by measurand, and measured value is influenced by environment and installation point are nonstandard;Sensor is pre- It buries inside cable connector, specification installation point can improve the consistency of measurement data.It is asked secondly, sensor reliability is to be improved Topic is intended solving by redundancy.The three of defect, temperature object are substantially large time constant, true hysteresis link, temperature rise to event There are the progressive formations of a quantitative change to qualitative change for barrier generation;Obviously, temperature one-parameter is difficult to meet the use of " it was found that failure symptom " Family demand;Solution is to introduce monitoring parameters -- the shelf depreciation of energy real-time characterization cable connector operating status.
Shelf depreciation (Partial Discharge, PD) is the discharge short phenomenon that dielectric occurs under electric field action, PD can both occur inside dielectric, may also appear in the surface or edge of dielectric.PD has intermittent and real-time, Not formed permanent discharge channel, still deficiency puncture dielectric in dielectric;But it is cable accessory insulation degradation One of the main reasons, and be the important feature amount for characterizing cable accessory state of insulation;Monitoring shelf depreciation is conducive to " it was found that failure Sign ".The International Powers such as IEC, IEEE and CIGRE authoritative institution recommends PD test as the best of cable insulation status evaluation Method;PD monitoring has pulse current test, vibration acceleration, electromagnetic wave, partial discharge quantity and supercritical ultrasonics technology etc., wherein pulse current Method is the method for being uniquely included in international standard (IEC60270) -- according to coupling principle, pass through HFCT sensor, acquisition cable PD When the pulsed current signal that generates, judge cable accessory state of insulation, implement fault pre-alarming.The two-parameter monitoring of temperature and PD are mended Neat short slab of the temperature one-parameter on " it was found that failure symptom ".
The setting of cable distribution box high degree of dispersion in the whole city X, the mainstream energy supply framework of cable connector monitoring device be CT induction+ Lithium battery charges online;Mainstream energizes the technology maturation of framework, the disadvantage is that reliability is barely satisfactory, need to seek source by and design needle To property circuit.The electric current of CT taking energy coil primary side is variable, there are over-voltages, should design excess voltage protection;Cable run There are unavoidable Microsecond grade lightning impulse or short circuit currents, can design the impact protection circuit based on TVS.Lithium battery fills Circuit is relative complex, and reliability is general, gives up lithium battery charging circuit;Because of the O&M code requirements in the city national grid X, Polling period≤3 month of 10kV power cable, therefore lithium battery charges show slightly extra online.Induction takes electric power configuration over-voltage Protection and impact protection circuit, can CT coil using taking for opening car coat type structure;It is aided with lithium battery backup power source again, constitutes electricity The modular power supply of cable joint monitoring device.In August, 2008, the city X enter wireless digital city;10kV power cable line is most In the WiFi covering domain in wireless digital city, acquisition data are only by the transmission of WiFi/2G/3G/4G multi-channel module Selection.
Without loss of generality, the 10kV power cable indoor terminal connector towards the city X is unfolded to discuss herein.
The more representational intellectual property Summary on research results in power cable connector monitoring device field is as follows:
Patent of invention " a kind of accurate thermometry of cable connector based on radio-frequency technique and device " (ZL201110056255.6), direct contact type method measurement cable connector or core wire surface temperature are proposed, will be counted by radio frequency According to external receiver is transferred to, external receiver provides electric energy to built-in thermal detector by radio frequency, solves the confession of built-in thermal detector Electric problem.
Patent of invention " partial discharge of high-voltage cable joint on-Line Monitor Device and its on-line monitoring method " (ZL200910024123.8), the High Voltage XLPE Power Cable connector partial discharge monitoring method of capacitive coupled sensors is proposed, Local discharge signal is coupled by fixing metal foil composition capacitive electrode on the cable body at cable connector both ends, and is passed through The current signal that detection impedance will be coupled into is converted to voltage signal.
It is above-mentioned to benefit our pursuits, there is certain reference value, but there are still limitations for exploration achievement.Therefore, it is necessary to existing On the basis of power cable connector monitoring device, make further innovative design.
Summary of the invention
The purpose of the present invention is overcome the deficiencies of the prior art and provide the prison of a kind of power cable connector temperature and PD parameter Survey device
Temperature and the two-parameter monitoring device of PD are by temperature measurement unit, combined electrical source unit, PD measuring unit, MCU master Control unit and WiFi/2G/3G/4G multichannel unit composition;Combined electrical source unit and temperature measurement unit, PD measuring unit, MCU Main Processing Unit is connected with WiFi/2G/3G/4G multichannel unit, provides the electric energy of temperature and the two-parameter monitoring device of PD;Temperature Degree measuring unit and PD measuring unit are connected with main control unit, MCU Main Processing Unit and WiFi/2G/3G/4G multichannel unit phase Even;According to the wireless signal situation of temperature and the two-parameter monitoring device infield PD, WiFi/2G/3G/4G multichannel unit is certainly Dynamic selection network: WiFi is preferentially selected if there are WiFi network, 2G or 3G or 4G net are selected if being in WiFi network blind spot Network;
Temperature measurement unit by the 1st digital temperature sensor, the 2nd digital temperature sensor, the 3rd digital temperature sensor, 4th digital temperature sensor, cable connector samming ring composition;Cable connector samming ring and cable connector are interference fitted, and cable connects On head samming ring outer diameter anchor ring, it is placed equidistant with 4 digital temperature sensor fixing holes, 90 ° of angle between hole, 4 digital temperatures are passed Sensor mounting hole and 4 digital temperature sensors correspond;Digital temperature sensor is embedded in mounting hole, and fixing clearance is used Heat Conduction Material filling;Digital temperature sensor model DS18B20;1st digital temperature sensor foot 3 meets VCC, foot 5 be grounded, foot 4 with Resistance R0It is connected, meets MCU Main Processing Unit C8051F060 foot 55, resistance R0Another termination VCC;2nd digital temperature sensor, The set-up mode of 3 digital temperature sensors and the 4th digital temperature sensor is identical as the 1st digital temperature sensor.
The combined electrical source unit is by opening air gap bayonet type taking energy coil, over-voltage protection module, rectifying and wave-filtering mould Block, transient protective module, DC-DC module, super capacitor storage and standby lithium pond module composition;It opens air gap bayonet type and takes energy line Snare be mounted in Exterior cable, successively with rectification filtering module endpoint a and b, DC-DC module endpoint c1And d, super capacitor storage and Standby lithium pond module is connected, and the output end of super capacitor storage and standby lithium pond module provides temperature and the two-parameter monitoring of PD The electric energy of device;Over-voltage protection module is attempted by a, b input terminal of rectification filtering module, and transient protective module is attempted by rectification The c of filter module1, d output end;It opens air gap bayonet type taking energy coil and takes energy from power cable, give temperature and PD after rectifying and wave-filtering Two-parameter monitoring device power supply, while giving super capacitor charging energy-storing;Lithium battery is rectification filtering module power supply and super electricity Store the backup power source that storage can power, when power cable inspection regularly replaces lithium battery;
Over-voltage protection module is by the implementation sub-module of overvoltage protection and the detection control submodule group of overvoltage protection At;The implementation sub-module of overvoltage protection is attempted by the end a, b, using solid-state relay SSR as core, one end of SSR output and a phase Even, the other end of SSR output is through energy consumption resistor R220It is connected with b;The detection control submodule of overvoltage protection is attempted by c1、d End, including the voltage-stabiliser tube D being sequentially connected221、D222And D223, D223The other end and adjustable resistance R221It is connected, the two common point Voltage V220, adjustable resistance R221The other end through voltage-stabiliser tube D224Ground connection, the i.e. end d, D221The other end then meet c1End;V220With SSR Control terminal be connected;Work as c1, the end d voltage Vc1dWhen > 75V, V220The operation voltage V of >=SSRT, open type SSR conducting closure, open The SSR and energy consumption resistor R that the induced current of air gap bayonet type taking energy coil passes through conducting closure220It releases, strangulation Vc1d≤75V; Voltage-stabiliser tube D221、D222And D223Model 1N4747A, voltage-stabiliser tube D224Model 1N4742A, SSR model JZC-22F-12VDC-1ZS;
Rectification filtering module is made of bridge rectifier, ∏ type filter circuit, the input terminal a and b of bridge rectifier, Output end c and d, input terminal c and d, the output end c of ∏ type filter circuit1And d;Transient protective module restrains two with transient voltage Pole pipe D240For core, D240It is attempted by c1With the end d, when there is short circuit current, particularly lightning impulse current on cable, D240It mentions For the transient protective of subsequent conditioning circuit, transient voltage restrains diode D240Model 5KP78CA;
DC-DC module is using MAX5035B as core, the foot 7 and resistance R of MAX5035B251, capacitor C251It is connected and connects c1 End, resistance R251The other end and resistance R252It is connected, resistance R252The other end and capacitor C251The foot 3,6 of the other end, MAX5035B Be connected ground connection, and MAX5035B foot 2 is through capacitor C252Ground connection, MAX5035B foot 8, capacitor C253, diode D250With inductance L250It is connected, Capacitor C253Another termination MAX5035B foot 1, diode D250Other end ground connection, inductance L250Another termination MAX 5035B foot 4, D250Model 50SQ100;Super capacitor storage and standby lithium pond module include series connection Schottky diode D260Lithium battery E250 Branch, super capacitor C260Branch, two branch circuit parallel connections, one end ground connection of parallel circuit, foot 4, the V of another termination MAX5035BCCWith The foot 18 of MCU Main Processing Unit C8051F060, Schottky diode D260Model D80-004.
WiFi/2G/3G/4G multichannel unit, as master controller, is gone to control by STM32F103RC by USART communication WiFi module and 2G/3G/4G module.The RX of the USART1 of STM32F103RC, TX pin connect the 62,61 of C8051F060 respectively and draw Foot, the RX of USART2, TX pin connect the 5 of WIFI module, 6 pins respectively, and the RX of USART3, TX connect 2G/3G/4G module respectively 1,2 pins.By the judgement of STM32F103RC controller, can choose which kind of communication modes of WIFI or 2G/3G/4G.System Main control unit C8051F060 only need data being sent to WiFi/2G/3G/4G multichannel unit, this element by serial ports Suitable communication modes can be selected automatically according to current network environment.
The PD measuring unit is made of HNC type magnetic balance Hall current sensor, sensor signal conditioning circuit, is passed Sensor signal conditioning circuit is using the 1st amplifier, the 2nd amplifier and the 3rd amplifier as core, amplifier model OP-27, the 1st amplifier and the 2nd fortune It puts and constitutes the preposition electric discharge road of bootstrap feedback, the 3rd amplifier constitutes bandpass filter;
HNC type magnetic balance Hall current sensor foot 1,2 is respectively connected to+12V, -12V power supply, and foot 4 is grounded, and foot 3 connects capacitor C311;Resistance R300、R312With capacitor C311The other end be connected, resistance R312The other end and resistance R311The 1st fortune of access after being connected The foot 2 put, resistance R311The other end be connected with the foot 6 of the 1st amplifier, resistance R313One end ground connection, the other end access the 1st amplifier Foot 3;Resistance R323One end ground connection, the other end access the 2nd amplifier foot 3, resistance R322、R321Be connected the 2nd amplifier after accessing Foot 2;Resistance R322The other end be connected with the foot 6 of the 1st amplifier, resistance R321The other end and R300The other end be connected after access The foot 6 of 2nd amplifier;
Capacitor C330、C333With resistance R330、R331It is connected, R331The other end ground connection, R330The other end and the 1st amplifier foot 6 are connected;Resistance R332One end ground connection, the other end access the 3rd amplifier foot 2, resistance R333With capacitor C333The other end be connected after Access the foot 3 of the 3rd amplifier, capacitor C334One end ground connection, the other end access the 3rd amplifier foot 4, capacitor C337One end ground connection, The other end accesses the foot 7 of the 3rd amplifier, capacitor C330The other end and resistance R333The other end be connected after access the 3rd amplifier foot 6;The foot 6 of 3rd amplifier exports VOUTTo the foot 9 of MCU Main Processing Unit C8051F060.
The MCU Main Processing Unit is using C8051F060 as core, the survey of 4 digital temperature sensors of temperature measurement unit Magnitude connects the temperature that position mean filter in 55,4 temperature datas works of C8051F060 foot handled, obtained cable connector by monobus Value;The shelf depreciation parameter V of PD measuring unitOUTC8051F060 foot 9 is connect, is AD converted by embedded AD mouthfuls of C8051F060; The power supply V that combined electrical source unit providesCCC8051F060 foot 64 and 18 is connect, C8051F060 is by foot 18 to VCCAD is carried out to turn It changes: if VCC≤ (5-0.2) V, temperature and the two-parameter monitoring device of PD enter battery powered mode, otherwise enter and take energy mould online Formula;
Position Mean Filtering Algorithm is as follows in the temperature data of 4 temperature sensors:
In formula, t [i] is the measured value of i-th digital temperature sensor;
Battery power supply/take energy mode online:
1.VCC≤ (5-0.2) V, into battery powered mode
Period × 10 of WiFi/2G/3G/4G multichannel unit transmission data
The operation data of power cable is only transmitted, power cable equipment data are locally temporary, remain transmission when inspection
2.VCC> (5-0.2) V, can mode into taking online
Restore the period of WiFi/2G/3G/4G multichannel unit transmission data
Transmit power cable full working scope data, including operation data and device data.
Compared with the background technology, the present invention, it has the beneficial effect that
Temperature and the PD for monitoring cable connector are two-parameter, help correctly to assess cable status, find failure and failure Sign;It realizes that fault pre-alarming can exclude cable fault in advance, promotes O&M level.Digital temperature sensor is using pre- inside connector Bury with redundancy specification mounting technique, improve temperature measurement reliability and measurement data consistency.Acquisition data pass through The transmission of WiFi/2G/3G/4G multi-channel module, reduces the O&M expense of monitoring device, has excellent cost performance.Open card Dress formula structure takes energy CT coil and overvoltage protection and impact protection circuit, improves the reliability that induction takes power supply;Sense Power supply+lithium battery backup power source should be taken to constitute modular power supply, combined electrical source structure is simple, reliable performance.
Detailed description of the invention
Fig. 1 is the structural block diagram of temperature and the two-parameter monitoring device of PD;
Fig. 2 (a) is the structure chart of temperature measurement unit;
Fig. 2 (b) is the circuit diagram of temperature measurement unit;
Fig. 3 (a) is the block diagram of combined electrical source unit;
Fig. 3 (b) is the circuit diagram of over-voltage protection module;
Fig. 3 (c) is the circuit diagram of rectifying and wave-filtering and transient protective module;
Fig. 3 (d) is the circuit diagram of DC-DC, super capacitor storage and standby lithium pond module;
Fig. 4 is the circuit diagram of PD measuring unit;
Fig. 5 is the circuit diagram of MCU Main Processing Unit;
Fig. 6 is the circuit diagram of WiFi/2G/3G/4G multichannel unit;
Specific embodiment
As shown in Figure 1, temperature and the two-parameter monitoring device of PD by temperature measurement unit 100, combined electrical source unit 200, PD measuring unit 300, MCU Main Processing Unit 400 and WiFi/2G/3G/4G multichannel unit 500 form;
Combined electrical source unit 200 and temperature measurement unit 100, PD measuring unit 300, MCU Main Processing Unit 400 and WiFi/2G/3G/4G multichannel unit 500 is connected, and provides the electric energy of temperature and the two-parameter monitoring device of PD;Temperature measurement unit 100 and PD measuring unit 300 is connected with main control unit 400, MCU Main Processing Unit 400 and WiFi/2G/3G/4G multichannel unit 500 are connected;According to the wireless signal situation of temperature and the two-parameter monitoring device infield PD, WiFi/2G/3G/4G multichannel Unit 500 automatically selects network: WiFi is preferentially selected if there are WiFi network, selected if being in WiFi network blind spot 2G or 3G or 4G network.
As shown in Fig. 2 (a), Fig. 2 (b), temperature measurement unit 100 is by the 1st digital temperature sensor 10, the 2nd digital temperature Sensor 20, the 3rd digital temperature sensor 30, the 4th digital temperature sensor 40, cable connector samming ring 50 form;Cable connects Head samming ring 50 is interference fitted with cable connector, on 50 outer diameter anchor ring of cable connector samming ring, is placed equidistant with 4 digital temperatures biographies Sensor mounting hole, 90 ° of angle between hole, 4 digital temperature sensor fixing holes and 4 digital temperature sensors one-to-one correspondence;Number Word temperature sensor is embedded in mounting hole, and fixing clearance is filled with Heat Conduction Material;Digital temperature sensor model DS18B20; 1st digital temperature sensor, 10 foot 3 meets VCC, foot 5 be grounded, foot 4 and resistance R0It is connected, meets MCU Main Processing Unit 400C8051F060 Foot 55, resistance R0Another termination VCC;2nd digital temperature sensor 20, the 3rd digital temperature sensor 30 and the 4th digital temperature The set-up mode of sensor 40 is identical as the 1st digital temperature sensor 10.
As shown in Fig. 3 (a), Fig. 3 (b), Fig. 3 (c), Fig. 3 (d), combined electrical source unit 200 takes energy by opening air gap bayonet type Coil 210, over-voltage protection module 220, rectification filtering module 230, transient protective module 240, DC-DC module 250, super electricity It stores storage and standby lithium pond module 260 forms;Open air gap bayonet type taking energy coil 210 and be sleeved on Exterior cable, successively with it is whole Flow filter module 230 endpoint a and b, 250 endpoint c of DC-DC module1And d, super capacitor storage and 260 phase of standby lithium pond module Even, the output end of super capacitor storage and standby lithium pond module 260 provides the electric energy of temperature and the two-parameter monitoring device of PD;It crosses Voltage protection module 220 is attempted by a, b input terminal of rectification filtering module 230, and transient protective module 240 is attempted by rectifying and wave-filtering The c of module 2301, d output end;Open air gap bayonet type taking energy coil 210 from power cable take can, after rectifying and wave-filtering to temperature and The two-parameter monitoring device power supply of PD, while giving super capacitor charging energy-storing;Lithium battery be rectification filtering module power supply and it is super Capacitor stores the backup power source of electric energy power supply, and when power cable inspection regularly replaces lithium battery;
Over-voltage protection module 220 is by the implementation sub-module of overvoltage protection and the detection control submodule of overvoltage protection Composition;The implementation sub-module of overvoltage protection is attempted by the end a, b, using solid-state relay SSR as core, one end of SSR output and a It is connected, the other end of SSR output is through energy consumption resistor R220It is connected with b;The detection control submodule of overvoltage protection is attempted by c1、d End, including the voltage-stabiliser tube D being sequentially connected221、D222And D223, D223The other end and adjustable resistance R221It is connected, the two common point Voltage V220, adjustable resistance R221The other end through voltage-stabiliser tube D224Ground connection, the i.e. end d, D221The other end then meet c1End;V220With SSR Control terminal be connected;Work as c1, the end d voltage Vc1dWhen > 75V, V220The operation voltage V of >=SSRT, open type SSR conducting closure, open The SSR and energy consumption resistor R that the induced current of air gap bayonet type taking energy coil 210 passes through conducting closure220It releases, strangulation Vc1d≤ 75V;Voltage-stabiliser tube D221、D222And D223Model 1N4747A, voltage-stabiliser tube D224Model 1N4742A, SSR model JZC-22F-12VDC- 1ZS;
Rectification filtering module 230 is made of bridge rectifier, ∏ type filter circuit, the input terminal a of bridge rectifier With b, output end c and d, input terminal c and d, the output end c of ∏ type filter circuit1And d;Transient protective module 240 is with transient voltage Restrain diode D240For core, D240It is attempted by c1With the end d, when there is short circuit current, particularly lightning impulse current on cable, D240The transient protective of subsequent conditioning circuit is provided, transient voltage restrains diode D240Model 5KP78CA;
DC-DC module 250 is using MAX5035B as core, the foot 7 and resistance R of MAX5035B251, capacitor C251Be connected c1 End, resistance R251The other end and resistance R252It is connected, resistance R252The other end and capacitor C251The foot 3,6 of the other end, MAX5035B Be connected ground connection, and MAX5035B foot 2 is through capacitor C252Ground connection, MAX5035B foot 8, capacitor C253, diode D250With inductance L250It is connected, Capacitor C253Another termination MAX5035B foot 1, diode D250Other end ground connection, inductance L250Another termination MAX 5035B foot 4, D250Model 50SQ100;Super capacitor storage and standby lithium pond module 260 include series connection Schottky diode D260Lithium battery E250Branch, super capacitor C260Branch, two branch circuit parallel connections, one end ground connection of parallel circuit, the foot 4 of another termination MAX5035B, VCCWith the foot 18 of MCU Main Processing Unit 400C8051F060, Schottky diode D260Model D80-004.
Illustrate: current rectifying and wave filtering circuit category knowledge scope, it is contemplated that the integrality of content only refers to herein but is not unfolded It discusses.
As shown in figure 4, PD measuring unit 300 is by HNC type magnetic balance Hall current sensor 340, sensor signal conditioning Circuit composition, sensor signal conditioning circuit with the 1st amplifier 310, the 2nd amplifier 320 and the 3rd amplifier 330 for core, amplifier model OP-27, the 1st amplifier 310 and the 2nd amplifier 320 constitute the preposition electric discharge road of bootstrap feedback, and the 3rd amplifier 330 constitutes bandpass filter;
340 foot 1,2 of HNC type magnetic balance Hall current sensor is respectively connected to+12V, -12V power supply, and foot 4 is grounded, and foot 3 connects Capacitor C311;Resistance R300、R312With capacitor C311The other end be connected, resistance R312The other end and resistance R311The is accessed after being connected The foot 2 of 1 amplifier 310, resistance R311The other end be connected with the foot 6 of the 1st amplifier 310, resistance R313One end ground connection, another termination Enter the foot 3 of the 1st amplifier 310;Resistance R323One end ground connection, the other end access the 2nd amplifier 320 foot 3, resistance R322、R321It is connected The foot 2 of 2nd amplifier 320 after access;Resistance R322The other end be connected with the foot 6 of the 1st amplifier 310, resistance R321The other end with R300The other end be connected after access the 2nd amplifier 320 foot 6;
Capacitor C330、C333With resistance R330、R331It is connected, R331The other end ground connection, R330The other end and the 1st amplifier 310 Foot 6 be connected;Resistance R332One end ground connection, the other end access the 3rd amplifier 330 foot 2, resistance R333With capacitor C333It is another The foot 3 of the 3rd amplifier 330, capacitor C are accessed in end after being connected334One end ground connection, the other end access the 3rd amplifier 330 foot 4, capacitor C337One end ground connection, the other end access the 3rd amplifier 330 foot 7, capacitor C330The other end and resistance R333The other end be connected The foot 6 of the 3rd amplifier 330 is accessed afterwards;The foot 6 of 3rd amplifier 330 exports VOUTTo the foot 9 of MCU Main Processing Unit 400C8051F060.
Illustrate: combined electrical source unit can convert offer ± 12V power supply by additional DC-DC, it is contemplated that terseness, this Text discussion undeployed.
As shown in figure 5, MCU Main Processing Unit 400 is using C8051F060 as core, temperature measurement unit 4 digital temperature sensing The measured value of device by monobus connect 55,4 temperature datas of C8051F060 foot make in position mean filter handle, cable connector Temperature value;The shelf depreciation parameter V of PD measuring unitOUTC8051F060 foot 9 is connect, is carried out by embedded AD mouthfuls of C8051F060 AD conversion;The power supply V that combined electrical source unit providesCCC8051F060 foot 64 and 18 is connect, C8051F060 is by foot 18 to VCCInto Row AD conversion: if VCC(Δ V=0.2~0.3V is the pressure drop of Schottky diode D80-004, value in this example to≤(5-0.2) V For 0.2), temperature and the two-parameter monitoring device of PD enter battery powered mode, otherwise enters and take energy mode online;
Position Mean Filtering Algorithm is as follows in the temperature data of 4 temperature sensors:
In formula, t [i] is the measured value of i-th digital temperature sensor;
Battery power supply/take energy mode online:
1、VCC≤ (5-0.2) V, into battery powered mode
Period × 10 of WiFi/2G/3G/4G multichannel unit transmission data;
The operation data of power cable is only transmitted, power cable equipment data are locally temporary, remain transmission when inspection;
2、VCC> (5-0.2) V, can mode into taking online
Restore the period of WiFi/2G/3G/4G multichannel unit transmission data;
Transmit power cable full working scope data, including operation data and device data.
Illustrate 1: in temperature and the two-parameter monitoring device of PD, the power consumption of WiFi/2G/3G/4G multichannel unit is maximum;Battery Under powering mode, period × 10 for transmitting data can be such that the power consumption of device declines.
Illustrate 2: the operation data and device data of temperature and the two-parameter monitoring device transmission power cable of PD, the former is main Power supply network runs operator and uses, and the latter is mainly used by power grid maintenance emergency staffs;Under battery powered mode, data are transmitted Only taking the subset of power cable full working scope data --- power cable operation data can be such that the power consumption of device further declines.

Claims (4)

1. a kind of temperature and the two-parameter monitoring device of PD, it is characterised in that device is by temperature measurement unit (100), modular power supply Unit (200), PD measuring unit (300), MCU Main Processing Unit (400) and WiFi/2G/3G/4G multichannel unit (500) composition; Combined electrical source unit (200) and temperature measurement unit (100), PD measuring unit (300), MCU Main Processing Unit (400) and WiFi/2G/3G/4G multichannel unit (500) is connected, and provides the electric energy of temperature and the two-parameter monitoring device of PD;Temperature measurement is single First (100) and PD measuring unit (300) are connected with main control unit (400), and MCU Main Processing Unit (400) and WiFi/2G/3G/4G are more Channel unit (500) is connected;According to the wireless signal situation of temperature and the two-parameter monitoring device infield PD, WiFi/2G/ 3G/4G multichannel unit (500) automatically selects network: preferentially selecting WiFi if there are WiFi network, is such as in WiFi network Blind spot then selects 2G or 3G or 4G network;
Temperature measurement unit (100) is by the 1st digital temperature sensor (10), the 2nd digital temperature sensor (20), the 3rd number temperature Spend sensor (30), the 4th digital temperature sensor (40) and cable connector samming ring (50) composition;Cable connector samming ring (50) It is interference fitted with cable connector, on cable connector samming ring (50) outer diameter anchor ring, is placed equidistant with 4 digital temperature sensor installations Hole, angle 900,4 digital temperature sensor fixing holes and 4 digital temperature sensors one-to-one correspondence between hole;Digital temperature passes Sensor is embedded in mounting hole, and fixing clearance is filled with Heat Conduction Material;Digital temperature sensor model DS18B20;1st number temperature Degree sensor (10) foot 3 meets VCC, foot 5 be grounded, foot 4 and resistance R0It is connected, connects MCU Main Processing Unit (400) C8051F060 foot 55, Resistance R0Another termination VCC;2nd digital temperature sensor (20), the 3rd digital temperature sensor (30) and the 4th digital temperature pass The set-up mode of sensor (40) is identical as the 1st digital temperature sensor (10).
2. a kind of temperature according to claim 1 and the two-parameter monitoring device of PD, it is characterised in that the combined electrical Source unit (200) by open air gap bayonet type taking energy coil (210), over-voltage protection module (220), rectification filtering module (230), Transient protective module (240), DC-DC module (250), super capacitor storage and standby lithium pond module (260) composition;Open air gap Bayonet type taking energy coil (210) is sleeved on Exterior cable, successively with rectification filtering module (230) endpoint a and b, DC-DC module (250) endpoint c1It is connected with d, super capacitor storage with standby lithium pond module (260), super capacitor storage and standby lithium pond The output end of module (260) provides the electric energy of temperature and the two-parameter monitoring device of PD;Over-voltage protection module (220) is attempted by whole A, b input terminal of filter module (230) are flowed, transient protective module (240) is attempted by the c of rectification filtering module (230)1, d it is defeated Outlet;It opens air gap bayonet type taking energy coil (210) and takes energy from power cable, filled after rectifying and wave-filtering to temperature and the two-parameter monitoring of PD Power supply is set, while giving super capacitor charging energy-storing;Lithium battery is that rectification filtering module power supply and super capacitor storage electric energy supply The backup power source of electricity, when power cable inspection, regularly replace lithium battery;
Over-voltage protection module (220) is by the implementation sub-module of overvoltage protection and the detection control submodule group of overvoltage protection At;The implementation sub-module of overvoltage protection is attempted by the end a, b, using solid-state relay SSR as core, one end of SSR output and a phase Even, the other end of SSR output is through energy consumption resistor R220It is connected with b;The detection control submodule of overvoltage protection is attempted by c1、d End, including the voltage-stabiliser tube D being sequentially connected221、D222And D223, D223The other end and adjustable resistance R221It is connected, the two common point Voltage V220, adjustable resistance R221The other end through voltage-stabiliser tube D224Ground connection, the i.e. end d, D221The other end then meet c1End;V220With SSR Control terminal be connected;Work as c1, the end d voltage Vc1dWhen > 75V, V220The operation voltage V of >=SSRT, open type SSR conducting closure, open The SSR and energy consumption resistor R that the induced current of air gap bayonet type taking energy coil (210) passes through conducting closure220It releases, strangulation Vc1d≤ 75V;Voltage-stabiliser tube D221、D222And D223Model 1N4747A, voltage-stabiliser tube D224Model 1N4742A, SSR model JZC-22F-12VDC- 1ZS;
Rectification filtering module (230) is made of bridge rectifier, ∏ type filter circuit, the input terminal a of bridge rectifier and B, input terminal c and d, the output end c of output end c and d, ∏ type filter circuit1And d;Transient protective module (240) is with transient voltage Restrain diode D240For core, D240It is attempted by c1With the end d, when there is short circuit current, lightning impulse current on cable, D240It mentions For the transient protective of subsequent conditioning circuit, transient voltage restrains diode D240Model 5KP78CA;
DC-DC module (250) is using MAX5035B as core, the foot 7 and resistance R of MAX5035B251, capacitor C251It is connected and connects c1 End, resistance R251The other end and resistance R252It is connected, resistance R252The other end and capacitor C251The foot 3,6 of the other end, MAX5035B Be connected ground connection, and MAX5035B foot 2 is through capacitor C252Ground connection, MAX5035B foot 8, capacitor C253, diode D250With inductance L250It is connected, Capacitor C253Another termination MAX5035B foot 1, diode D250Other end ground connection, inductance L250Another termination MAX5035B foot 4, D250 Model 50SQ100;Super capacitor storage and standby lithium pond module (260) include series connection Schottky diode D260Lithium battery E250Branch, super capacitor C260Branch, two branch circuit parallel connections, one end ground connection of parallel circuit, the foot 4 of another termination MAX5035B, VCCWith the foot 18 of MCU Main Processing Unit (400) C8051F060, Schottky diode D260Model D80-004;
WiFi/2G/3G/4G multichannel unit (500), as master controller, is gone to control by STM32F103RC by USART communication WiFi module and 2G/3G/4G module;The RX of the USART1 of STM32F103RC, TX pin connect the 62,61 of C8051F060 respectively and draw Foot, the RX of USART2, TX pin connect the 5 of WIFI module, 6 pins respectively, and the RX of USART3, TX connect 2G/3G/4G module respectively 1,2 pins;By the judgement of STM32F103RC controller, communication modes can be selected from WIFI or 2G/3G/4G.
3. a kind of temperature according to claim 1 and the two-parameter monitoring device of PD, it is characterised in that the PD measures single First (300) are made of HNC type magnetic balance Hall current sensor (340), sensor signal conditioning circuit, sensor signal conditioning Circuit with the 1st amplifier (310), the 2nd amplifier (320) and the 3rd amplifier (330) be core, amplifier model OP-27, the 1st amplifier (310) and the 2nd amplifier (320) constitutes the preposition electric discharge road of bootstrap feedback, and the 3rd amplifier (330) constitutes bandpass filter;
HNC type magnetic balance Hall current sensor (340) foot 1,2 is respectively connected to+12V, -12V power supply, and foot 4 is grounded, and foot 3 connects electricity Hold C311;Resistance R300、R312With capacitor C311The other end be connected, resistance R312The other end and resistance R311The 1st is accessed after being connected The foot 2 of amplifier (310), resistance R311The other end be connected with the foot 6 of the 1st amplifier (310), resistance R313One end ground connection, it is another Terminate the foot 3 into the 1st amplifier (310);Resistance R323One end ground connection, the other end access the 2nd amplifier (320) foot 3, resistance R322、R321The foot 2 of 2nd amplifier (320) after connected access;Resistance R322The other end be connected with the foot 6 of the 1st amplifier (310), electricity Hinder R321The other end and R300The other end be connected after access the 2nd amplifier (320) foot 6;
Capacitor C330、C333With resistance R330、R331It is connected, R331The other end ground connection, R330The other end and the 1st amplifier (310) Foot 6 is connected;Resistance R332One end ground connection, the other end access the 3rd amplifier (330) foot 2, resistance R333With capacitor C333It is another The foot 3 of the 3rd amplifier (330), capacitor C are accessed in end after being connected334One end ground connection, the other end access the 3rd amplifier (330) foot 4, Capacitor C337One end ground connection, the other end access the 3rd amplifier (330) foot 7, capacitor C330The other end and resistance R333It is another The foot 6 of the 3rd amplifier (330) is accessed at end after being connected;The foot 6 of 3rd amplifier (330) exports VOUTTo MCU Main Processing Unit (400) The foot 9 of C8051F060.
4. a kind of temperature according to claim 1 and the two-parameter monitoring device of PD, it is characterised in that the MCU master control list First (400) using C8051F060 as core, the measured value of 4 digital temperature sensors of temperature measurement unit is connect by monobus Position mean filter handles, obtains the temperature value of cable connector in 55,4 temperature datas works of C8051F060 foot;The office of PD measuring unit Portion discharge parameter VOUTC8051F060 foot 9 is connect, is AD converted by embedded AD mouthfuls of C8051F060;Combined electrical source unit mentions The power supply V of confessionCCC8051F060 foot 64 and 18 is connect, C8051F060 is by foot 18 to VCCIt is AD converted: if VCC≤(5-0.2) V, temperature and the two-parameter monitoring device of PD enter battery powered mode, otherwise enter and take energy mode online;
Position Mean Filtering Algorithm is as follows in the temperature data of 4 temperature sensors:
In formula, t [i] is the measured value of i-th digital temperature sensor;
Battery power supply/take energy mode online:
1).VCC≤ (5-0.2) V, into battery powered mode
Period × 10 of WiFi/2G/3G/4G multichannel unit transmission data;
The operation data of power cable is only transmitted, power cable equipment data are locally temporary, remain transmission when inspection;
2).VCC> (5-0.2) V, can mode into taking online
Restore the period of WiFi/2G/3G/4G multichannel unit transmission data;
Transmit power cable full working scope data, including operation data and device data.
CN201710028196.9A 2017-01-13 2017-01-13 The monitoring device of power cable connector temperature and PD parameter Expired - Fee Related CN106896300B (en)

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