CN106950458A - The short circuit of low pressure uniline and disconnection detection device - Google Patents

The short circuit of low pressure uniline and disconnection detection device Download PDF

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Publication number
CN106950458A
CN106950458A CN201710151772.9A CN201710151772A CN106950458A CN 106950458 A CN106950458 A CN 106950458A CN 201710151772 A CN201710151772 A CN 201710151772A CN 106950458 A CN106950458 A CN 106950458A
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CN
China
Prior art keywords
module
voltage
low pressure
power supply
unit
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Pending
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CN201710151772.9A
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Chinese (zh)
Inventor
张玉荣
杨祖明
陈攀
江友超
李明浩
周洪奎
杨勇
李杨
王�华
李晓红
王浩宇
黄志乾
况野
李雪娇
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State Grid Corp of China SGCC
Jiangbei Power Supply Co of State Grid Chongqing Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Jiangbei Power Supply Co of State Grid Chongqing Electric Power Co Ltd
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Application filed by State Grid Corp of China SGCC, Jiangbei Power Supply Co of State Grid Chongqing Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201710151772.9A priority Critical patent/CN106950458A/en
Publication of CN106950458A publication Critical patent/CN106950458A/en
Pending legal-status Critical Current

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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
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58Testing of lines, cables or conductors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Abstract

The invention provides a kind of short circuit of low pressure uniline and disconnection detection device, including:Power module, including the first power supply module and the second power supply module;First power supply module is used to access low pressure uniline acquisition 220V alternating currents, and generates low-voltage DC source signal, and line fault Preliminary detection unit is provided with first power supply module;Second power supply module is used to access battery, and generates low-voltage DC source signal;Handover module is connected between first power supply module and the second power supply module;Control module, electrical interconnection failure Preliminary detection unit, and based on the detection signal obtained from the line fault Preliminary detection unit, control handover module action;Fault detection module, including it is electrically connected to the short trouble detection unit and disconnection fault detection unit of control module;And alarm module.Detection means proposed by the present invention compensate for the technology shortage that prior art carries out fault detect to Rural Low-Voltage Power Network single-phase circuit, can be masses' rapidly removing faults.

Description

The short circuit of low pressure uniline and disconnection detection device
Technical field
The present invention relates to power system detection technique field, and in particular to a kind of short circuit of low pressure uniline and open circuit detection Device.
Background technology
With the upgrading of rural power grids, the situation of the simple and crude backwardness of rural power infrastructure, rural electricity consumption popularization are substantially changed Rate, power consumption and power supply quality are significantly improved, and are improved rural economy environment and life of farmers condition, have been pulled rural economy, The development of related industry is driven.Rural power grids circuit gos deep into huge numbers of families, and not only professional contacts, numerous laymans, including Ordinary people can touch, and greatly increase the probability of line failure.Such as with the lifting of life in the countryside level, electricity consumption Equipment is also greatly promoted with power consumption, and electrical fire caused by some short circuits and household electrical appliance, equipment burn out accident and happened occasionally. Rural power grids electric pole facility environment is complex, because the broken string situation that the reasons such as bad weather, construction violating the regulations are caused also happens occasionally. And these line faults undoubtedly constitute a threat to personal safety, it is necessary to timely investigation is carried out to line fault and is handled.At present National grid staff can only be by usually inspection or passive discovery line fault problem, and line fault problem can only be by Professional carries out troubleshooting maintenance, and ordinary people absolutely not just can arbitrarily contact, if long-time is shelved, easily Trigger security incident.If timely finding line fault, network operation personnel just can faster overhaul circuit, reduce the people Therefore the security threat being subject to, ensures the electricity consumption of the masses.Therefore, one kind can automatic detection circuit failure, and can actively report Alert device seems outstanding important.
Foreign countries' electronic information technical field does not have the technology detected on Guangdong power system at present.And the country is mainly Commercial power line fault detects that industrial circuits voltage is high, and the potential safety hazard for initiation of breaking down is even more serious.Because industrial line The detection device on road is not appropriate for Rural Low-Voltage Power Network uniline.If line fault can accurately be detected, prevent safety hidden The generation of trouble, it is necessary to be targetedly equipment detection.And the main line failure of low pressure uniline is short circuit and breaks, Line short and disconnection fault are only accurately detected, effective fault warning could be sent to network operation personnel.Carried for this Go out a kind of new technique device for detecting the short circuit of low pressure uniline and broken string.
The content of the invention
The problem to be solved in the present invention is to be directed to above-mentioned not enough in the presence of prior art and to provide a kind of low pressure single-phase Line short and disconnection detection device, the detection means can effective detection go out short circuit and the open circuit fault of low pressure uniline, And alarm is realized, solve fault detection technique shortage problem of the prior art to low pressure uniline.
To achieve the above object, present invention employs following technical scheme:
The short circuit of low pressure uniline and disconnection detection device, it includes:
Power module, it includes the first power supply module and the second power supply module;First power supply module is low for accessing Press uniline to obtain 220V alternating currents, and generate low-voltage DC source signal, circuit is provided with first power supply module Failure Preliminary detection unit;Second power supply module is used to access battery, and generates low-voltage DC source signal;Described Handover module is connected between one power supply module and the second power supply module, and selects one of them to supply in the presence of handover module Electric module work;
Control module, it obtains the low-voltage DC source signal from power module and is operated, the control module electricity Connection line failure Preliminary detection unit, and based on the detection signal obtained from the line fault Preliminary detection unit, control institute State handover module action;
Fault detection module, it includes line short fault detection unit and line disconnection failure detection unit, the line Short out road fault detection unit includes being used for the electric current sensing unit for detecting low pressure uniline curent change and for by electric current The induced-current that sensing unit is produced is converted to voltage signal and the first output unit exported, the line disconnection failure detection Unit includes being used for the voltage induced unit for detecting low pressure uniline voltage change and for voltage induced unit to be produced Induced voltage signal is compared the second output unit of output, the line short fault detection unit and line disconnection failure Detection unit is electrically connected to control module, to detect signal to control module output is corresponding;And
Alarm module, it is electrically connected to the control module, and alarm signal is sent with the instruction of receive and control module.
Compared to prior art, the present invention has the advantages that:
The short circuit of low pressure uniline and disconnection detection device that the present invention is provided are main by power module, control module, event Hinder detection module and alarm module is constituted.Wherein power module is included by obtaining the first of 220V alternating currents from low pressure uniline Power supply module and the second power supply module for obtaining 8V direct currents from battery are constituted, and the two can flexibly be cut by handover module Change, and preliminary judgement of the basis based on control module to line fault of switching, cause the when low pressure uniline breaks down As soon as power supply module can not be control module normal power supply, control is switched to storage battery power supply.And control module can then enter one Step by fault detection module detect the specific failure situation of circuit (judgement is short trouble or disconnection fault), when it is determined that Then alarmed after failure situation by alarm module.The above-mentioned detection device that the present invention is provided compensate for prior art to rural power grids Low-voltage single-phase electric road carries out the technology shortage of fault detect, can be masses' rapidly removing faults, ensure masses' electricity consumption.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the flow chart of low pressure uniline of the present invention short circuit and disconnection detection device;
Fig. 2 is the electrical schematic diagram of power module of the present invention;
Fig. 3 is the one of which physical circuit schematic diagram of power module of the present invention;
Fig. 4 is another physical circuit schematic diagram of power module of the present invention;
Fig. 5 is the circuit theory diagrams of line short fault detection unit of the present invention;
Fig. 6 is the circuit theory diagrams of line disconnection failure detection unit of the present invention;
Fig. 7 is the circuit theory diagrams of LED alarm units of the present invention;
Fig. 8 is the circuit theory diagrams of buzzer warning unit of the present invention;
Fig. 9 is the circuit theory diagrams of control module of the present invention;
Circuit theory diagrams of the Figure 10 by control module of the present invention even J-Link circuits;
Figure 11 is the 3.3V power supply circuit schematic diagrams of control module of the present invention.
Embodiment
In order that the technological means of the invention realized, creation characteristic, reached purpose more understand and are apparent to effect, The present invention is further elaborated with reference to the accompanying drawings and detailed description:
Reference picture 1 simultaneously combines Fig. 2-6, and the present invention proposes a kind of low pressure uniline short circuit and disconnection detection device, its Including:
Power module, it includes the first power supply module and the second power supply module;First power supply module is low for accessing Press uniline to obtain 220V alternating currents, and generate low-voltage DC source signal, circuit is provided with first power supply module Failure Preliminary detection unit;Second power supply module is used to access battery BAT1, and generates low-voltage DC source signal;Institute State and handover module is connected between the first power supply module and the second power supply module, and select in the presence of handover module wherein one Individual power supply module work;
Control module, it obtains the low-voltage DC source signal from power module and is operated, the control module electricity Connection line failure Preliminary detection unit, and based on the detection signal obtained from the line fault Preliminary detection unit, control institute State handover module action;
Fault detection module, it includes line short fault detection unit and line disconnection failure detection unit, the line Short out road fault detection unit includes being used for the electric current sensing unit for detecting low pressure uniline curent change and for by electric current The induced-current that sensing unit is produced is converted to voltage signal and the first output unit exported, the line disconnection failure detection Unit includes being used for the voltage induced unit for detecting low pressure uniline voltage change and for voltage induced unit to be produced Induced voltage signal is compared the second output unit of output, the line short fault detection unit and line disconnection failure Detection unit is electrically connected to control module, to detect signal to control module output is corresponding;And
Alarm module, it is electrically connected to the control module, and alarm signal is sent with the instruction of receive and control module.
In such scheme of the present invention, the short circuit of low pressure uniline and disconnection detection device are main by power module, control mould Block, fault detection module and alarm module are constituted.Wherein power module is included by obtaining 220V alternating currents from low pressure uniline The first power supply module and from battery obtain 8V direct currents the second power supply module constitute, the two can be carried out by handover module Flexibly switching, and the basic preliminary judgement based on control module to line fault of switching, when low pressure uniline breaks down During prevent the first power supply module is from for control module normal power supply, storage battery power supply is switched to regard to control.And control module is then Further the specific failure situation of circuit (judgement is short trouble or disconnection fault) can be detected by fault detection module, When it is determined that then being alarmed by alarm module after failure situation.
Reference picture 2 and Fig. 3 or Fig. 4, first power supply module include:Low pressure uniline, it provides 220V alternating currents; The A/D converting units being made up of transformer unit T2 and rectification unit DB1, its be used for by 220V alternating currents step-down, be rectified into it is low Press direct current signal;With 8/5 voltage reduction module, it is electrically connected to the A/D converting units by handover module, for working as handover module When being switched to first power supply module work, low-voltage dc signal is converted into low-voltage DC source signal.In Fig. 3 or Fig. 4,8/ 5 voltage reduction modules are constituted using LM7805CK chips, it can be seen that electric capacity C4 is used to detect circuit in control module Of short duration operating voltage is provided during failure for control module, makes control module be enough to control handover module so that what battery was constituted Second power supply module carries out normal power supply.
In Fig. 3, the first power supply module by the direct power taking of low pressure uniline, but device control module operating voltage be by 5V DC voltages.So being changed into DC voltage by 220V voltage step-downs and then by rectifier bridge DB1 using transformer T2, then pass through Cross C1, C2 and carry out voltage stabilizing processing, treatment and supplied lithium battery 18650 charges (SB1 is pressed, K3 closures, is omitted in Fig. 3).And lead to Cross LM7805CK and be converted to 5V dc sources, the 5V dc sources after conversion are filtered after voltage stabilizing is handled again by C3, C4 Supply control module.In line disconnection failure just by storage battery power supply, the 8V direct currents of battery supply pass through LM7805CK It is changed into 5V direct currents, also passes through and other modules are supplied after C3, C4 filtering voltage regulation use.Fig. 4 is using switch power module electricity Road is constituted, and it is converted to dc source also by transformer T2 by 220V ac bucks and then by rectifier bridge DB1, and C1, C2 are steady It is converted into after 5V dc sources being finally fed other modules by C3, C4 burning voltage with LM7805CK chips again after pressure and uses.Open Powered-down source is that off-the-shelf is directly used using wide.So the use of Switching Power Supply can be a kind of feasible scheme.
With reference to Fig. 2, the line fault Preliminary detection unit is constituted using relay K1;Wherein, the relay K1 Trigger winding K1-T two ends are respectively connected to the live wire and zero line of low pressure uniline, the output loop K1-1 of the relay K1 Two ends connect respectively and control module one of input, with when coil electricity/power-off to control module transmit phase The level signal answered.Here two of output loop touch when relay K1 uses dynamic circuit connector type relay, i.e. trigger winding no power Point is to disconnect, and two contacts of output loop are just closed after energization.Reference picture 2, when low pressure uniline is normal, relay K1 trigger winding K1-T obtains electric so that output loop K1-1 is closed, now the PA1 inputs of control module (by taking single-chip microcomputer as an example) Termination receives low level signal, and control module judges circuit normal work when recognizing the low level signal;Conversely, when circuit is prominent Send out failure, trigger winding K1-T dead electricity so that output loop K1-1 is opened, now the PA1 inputs of single-chip microcomputer receive high electricity Ordinary mail number, will judge line failure when single-chip microcomputer recognizes the high level signal.To then short trouble or open circuit Failure, then detected according to short trouble detection unit and open circuit fault detection unit.
Reference picture 2, second power supply module includes:Battery BAT1, it provides 8V direct currents;Hand switch SB1, its Battery is accessed in one end, and the other end accesses 8/5 voltage reduction module through handover module;Supplied when handover module is switched to described second During electric module work, by closing hand switch SB1 so that battery BAT1 powers for control module.It can be observed from fig. 2 that defeated The low-voltage DC source signal gone out is 5V.
Here, with reference to shown in Fig. 2, the handover module includes:Relay K2 and control relay K2 trigger windings K2-T First drive circuit of energization action, the output loop K2-1 of the relay K2 is connected to A/D converting units and 8/5 step-down mould Between block, first drive circuit is connected to control module, and the instruction sent for receive and control module is so as to control relay Whether device K2 trigger windings K2-T is powered;And relay K3 and control relay K3 trigger winding K3-T energizations action second Drive circuit, the output loop K3-1 of the relay K3 is connected between hand switch SB1 and 8/5 voltage reduction module, and described Two drive circuits are connected to control module, and the instruction sent for receive and control module is so that control relay K3 trigger windings Whether K3-T is powered.
Wherein, relay K2 the first drive circuit is mainly made up of R6, R3, Q3, R2, Q1, D1, and the second of relay K3 Drive circuit is mainly made up of R5, Q4, R4, R1, Q2, D2.After single-chip microcomputer is normally run, circuit is detected by relay K1 When normal, control Q3, Q4 are not turned on so that relay K2, K3 trigger winding electric, K2-1 closures, K3-1 disconnections, now Device is directly from the power taking of low pressure uniline (i.e. the first power supply module is powered);When single-chip microcomputer by relay K1 detects circuit During failure, control Q3, Q4 conducting, relay K2, K3 equal dead electricity of trigger winding, K2-1 disconnects, and (SB1 is for K3-1 closures Press), now device obtains operating voltage from battery (i.e. the second power supply module is powered).
With reference to Fig. 2-4, the power module power supply the principle of the present invention is sketched:
When circuit is normal, device directly takes 220V power supplys by low pressure uniline L, N.Electric current passes through K1, relay Coil K1-T obtains electric, relay switch K1-1 closures, and circuit normal work is thought after single-chip microcomputer identification.Again by transformer T2 and 220V AC powers are changed into 8V dc sources by rectifier bridge DB1.Relay K2 is now normally open, in closure switch SB1, is stored Battery starts electric discharge, and by 8/5 voltage reduction module, battery 8V dc sources are reduced to the 5V direct currents of suitable single-chip microcomputer operation Source.After single-chip microcomputer normal work, K2, K3 coil obtain electric so that K2-1 is closed, and K3-1 disconnects, and single-chip microcomputer is supplied by 220V circuits Electricity.And Single-chip Controlling relay K3 often crosses 5 hours closures once, such circuit can be battery charging, and can be to single Piece machine is powered.K3 disconnects after battery charges 30 minutes.Reach the target that continuation of the journey is good and economizes on resources.
When line short and disconnection fault, relay K1 coil losing electricities, relay switch K1-1 is opened, and single-chip microcomputer is considered as Line fault.Now control Q3, Q4 conductings, relay K2, K3 equal dead electricity of trigger winding, K2-1 disconnects, K3-1 closures, electric power storage Pond powers to single-chip microcomputer.Now, alarm module starts to send alarm short message to operator on duty, and audible and visible alarm also can be according to failure feelings Condition carries out the alarm of different frequency.
In such scheme, price material benefit, the characteristics of charge capacity is big, because lithium battery master are mainly complied with the selection of lithium battery Used if being discharged in circuit breaking by lithium battery to device, be required for ensureing that device has before circuit maintainer reaches Electricity.And lithium battery 18650 and poly-lithium battery can meet such demand.Lithium battery 18650:Lithium battery has weight Gently, capacity is big, memory-less effect the advantages of, the capacity of 18650 lithium batteries is generally between 1200mah~3600mah.Security Can be high, do not explode, do not burn;It is nontoxic, it is pollution-free, recycle number of times and be more than 500 times.Before charging also need not be by dump energy Emptying, it is easy to use.Poly-lithium battery:Poly-lithium battery advantage, small volume, capacity is big, has the disadvantage that the life-span compares 18650 Short, price is higher than 18650, because using different designs and material, has liquid inside some, some are dryness either colloids Property, and performance is not so good as 18650 cylindrical battery during heavy-current discharge, so the electrical equipment of Large Copacity small size is needed, Usually using poly-lithium battery, most typical performance is exactly the equipment such as mobile phone, panel computer.
In the present invention, the fault detection module mainly for detection of low pressure uniline line condition, it is necessary to reliability Detect line short fault and line disconnection failure.After the relatively good identification of line disconnection failure, circuit breaking, whole circuit In power failure state, identification is reliable.And during line short fault generation, electric current can increase sharply, although the time is shorter, but electric Stream is linear increase.Short circuit current flow moment reaches a very high value.So reliable record current state is needed, and by Whether MCU module Treatment Analysis circuit is short-circuit.
With reference to Fig. 5, in the line short fault detection unit, the electric current acquiring unit uses the electric current of open-type Transformer T4, for detecting the curent change of low pressure uniline, and produces corresponding induced-current;First output unit Including:Being connected to the current-limiting resistance R28 at current transformer T4 outputs lateral coil two ends, (R28 is used to change induced-current here U7A " 3 " place is sent to for voltage signal) and voltage-regulator diode D6, voltage-regulator diode D6 plus earth;With by amplifier U7A structures Into voltage follower, amplifier U7A in-phase input end is connected to voltage-regulator diode D6 negative electrode, and output end is drawn through resistance R12 Go out, and resistance R12 output is also grounded through electric capacity C13.
The operation principle of the line short fault detection unit is as follows:Because low pressure uniline does not allow broken string to grasp Make, so T4 is the current transformer of open-type herein.When opening current transformer T4 is suspended in circuit, it can detect that low pressure is single-phase Curent change in circuit.During circuit normal work, the electric current of opening current transformer conversion corresponding proportion passes through operation amplifier Device U7A (LM224).The electric signal of transformer conversion is by LM224 operational amplifiers formation close loop negative feedback, and electric signal can be according to Certain multiple amplifies out, then inputs and analyzed into control module.During line short fault, electric current can increase sharply, and R28 is current limliting Resistance is prevented because short circuit causes electric current to increase sharply and caused damage to circuit, and 1N4732A is that voltage-regulator diode controls voltage surely It is scheduled on 4.7V, it is ensured that the normal work of circuit.Because it is also linear increase that electric current, which increases sharply, electric signal constantly comes at Cur_A Whether the electric current of one-chip computer module can be line short by automatic identification.Such as MCU module sets critical point as 300A, then works as electricity When stream is more than 300A, single-chip microcomputer can judge line short fault.
With reference to Fig. 6, in the line disconnection failure detection unit, the voltage acquisition unit is using transformer T1 or opens The voltage transformer of the shape of the mouth as one speaks, for detecting the voltage change of low pressure uniline, and produces corresponding induced voltage, in the defeated of T1 Go out side two ends and be parallel with resistance R11;Second output unit includes:The comparator circuit being made up of amplifier U6A, amplifier U6A In-phase input end be connected to voltage acquisition unit through resistance R7, amplifier U6A inverting input is grounded through resistance R9, amplifier U6A output end draws through resistance R8, while be connected to inverting input through resistance R10, and resistance R8 output also through electric capacity C15 Ground connection.
The operation principle of the line disconnection failure detection unit is as follows:Low pressure uniline 220V alternating currents and transformer T1 connects, when circuit normal work, and 220V exchanges produce correspondingly sized induced voltage by transformer T1 in secondary side, should Induced voltage signal is sent to the comparator being made up of amplifier U6A (LM224).LM224 comparators are powered by+5V single supplies, C14 electricity Appearance effect is burning voltage, it is ensured that comparator normal work.With reference to Fig. 6, the voltage at amplifier U6A " 3 " place and the voltage ratio at " 2 " place Compared with " 2 " place voltage is 0, if " 3 " place voltage is higher than " 2 " place, now " 1 " place output level is high level, and single-chip microcomputer is identified as line Road normal work.When circuit breaking, " 3 " place voltage is 0, and " 3 " place's voltage is equal with " 2 " place voltage, and " 1 " place output level is Low level, single-chip microcomputer is identified as line disconnection failure, then sends disconnection fault signal to alarm module.Here, transformer T1 It can also be realized using voltage transformer.But during using voltage transformer, voltage transformer need to be using open-type, because low pressure Circuit does not allow burn out detection.So voltage transformer compares the voltage detected by comparator, during normal work, compare Device output signal is high level, and single-chip microcomputer is considered as circuit normal work.During disconnection fault, comparator output signal is low level, Single-chip microcomputer is considered as line disconnection failure, and sends fault-signal.
In the present invention, the alarm module is the police that can be just started working when MCU is identified as circuit failure Show module.When circuit is normal, alarm module is in holding state, once occurring line fault, alarm module will be proceeded by Alert process.Alarm module is divided into onsite alarming and remote alarms.Remote alarms be in order in line failure can and When to maintainer on duty send alarming short message, save maintainer inspections fault time with receive failure notification when Between.Onsite alarming be for maintainer after energy after reaching the spot fast-positioning device position, and also function to a warning The masses please don't be close effect.Specifically, the alarm module includes LED alarm units, buzzer warning unit and long-range Wherein one or more in alarm unit.Wherein, onsite alarming is mainly LED alarm units, buzzer warning unit.
Reference picture 7, which show the circuit diagram of LED alarm units.LED warning circuits are used for onsite alarming, it is contemplated that work Many severe working environments can be run into maintenance by making personnel, if the colour of sky is later, then LED alarms are with regard to that can play one very Good live warning function.Electric current flows into tri- light emitting diodes of D13, D11, D12 from Vbat, by light emitting diode is allowed The electric current flowed through is smaller, about 10 milliamperes or so, so needing string resistance to carry out current limliting.Here the resistance in 470 Europe is chosen to ensure The normal work of light emitting diode.
Reference picture 8, which show the circuit diagram of buzzer warning unit.Buzzer alarm circuit is also to be used for scene report It is alert, it is obstructed because scene may meet with realization, such as runs into university's foggy weather, buzzer warning is made with regard to that can play warning well With.Buzzer operating current is entered by Vbat, when MCU module detects line failure, and BUZZER, which can come into, comes one Electric signal, is now high level at 1, and Q1 triodes will be turned on, and buzzer also can normal work.R2 and R5 are in triode ON When play a protective effect to circuit, prevent circuital current from increasing suddenly and damage triode.
The remote alert unit includes GSM/GPRS modular circuits, SIM Card circuits and antenna, wherein GSM/GPRS Modular circuit is connected to control module, and the SIM Card circuits and the antenna are connected to GSM/GPRS modular circuits.This In, GSM/GPRS modules can be constituted using SIM900A chips and its peripheral circuit, and SIM900A is the GSM/GPRS moulds of 2 frequencies Block, the frequency range of work is:EGSM 900MHz and DCS 1800MHz.SIM900A supports GPRS multi-slot class 10/ Class 8 (optional) and GPRS coded formats CS-1, CS-2, CS-3 and CS-4.SIM Card circuits are used for the SIM for running insertion Phonecard, by China Mobile's operation platform, transmits the short message of circuit fault warning.Antenna circuit and SIM900A GSM circuits, SIM Card circuits are used cooperatively.Device erecting bed often occurs that the thing of many influence device signals occurs, and such as runs into Heavy snow weather, rainstorm weather.And in this case, antenna circuit can strengthen reception and sending signal.The inspection of ensuring equipment Surveying short message can send in real time.Here, operation principle is repeated no more.
Reference picture 9-11, which show the control module circuit diagram of the present invention.Control module (hereinafter referred to as MCU module) is The core system of whole device.Because MCU module not only connects fault detection module, power module, alarm modules. Also need to receive and transmit the signal between them.MCU module is equivalent to brain, controls the action of other modules.So MCU Module is also required for powerful capacity and computing capability, and MCU module is mainly by STM32F103C8T6 chips (Fig. 9), J-Link electricity Road (Figure 10), chip power supply circuit (Figure 11), the part of pin circuit four composition of running in outside.
MCU module is using STM32F103C8T6 chips as core, and STM32F103C8T6 chips strengthen for intermediate size Type, the controller USB of 32 bands 64 or 128K byte flash memories based on ARM cores, CAN, 7 timers, 2 ADC, 9 lead to Believe interface.JT1, JT2 and capacitance resistance constitute crystal oscillating circuit in Fig. 9, and concussion electric current is produced in whole circuit, send clock letter Number, produce clock frequency necessary to single-chip microcomputer.It is programmed using C voices, the operating for controlling whole device.J- Link circuits are the foundation stones that J-Link emulators connect MCU module and computer.MCU can make it is necessary to have J-Link circuits Single-chip microcomputer is programmed with programming software.MCU module is mainly powered, but partial circuit needs 3.3V to power by 5V power supplys, institute To need chip power supply circuit.5V dc sources flow into circuit by 1,2 interfaces in this circuit, access C6, C11 electric capacity, are Ensure circuit normal work to stablize 5V voltages.Stable 5V voltages enter MK2 and are depressured chip voltage into 3.3V direct currents.Drop 3.3V after pressure stablizes, it is necessary to which C8, C9, C10, C12 electric capacity carry out burning voltage not enough.The input of other modules is rethought after stable 3.3V electricity.Ensure effective operation of whole circuit.External world's row's pin circuit (not shown) is mainly used in MCU module, by single-chip microcomputer Each pin of STM32F103C8T6 chips is drawn, and is conducive to chip to be connected control with other components in MCU module System.Such as the input that PC14-OSC32-IN, PC15-OSC32-OUT, PD0-OSC-IN, PD1-OSC-OUT are two crystal oscillating circuits Output.PB10-485_TX, PB11-485_RX are the connecting terminal of 485 communication serial ports.
Generally speaking, low pressure uniline provided by the present invention short circuit and broken thread detector it is main by power module, MCU module, fault detection module, the part of alarm module four are constituted.Device is directly powered by 220V low pressure uniline, and 220V is handed over Stream electricity is converted to 5V dc sources by power module again and MCU module is powered, and the single-chip microcomputer in MCU module is examined to signal Survey, by external cabling signal transmission circuit, if circuit is normal, device normal work.If line short and disconnection fault, MCU control alarm modules carry out remote alarm and field alert.Remote alarm uses short message real-time alert, is more easy to receive event in time Hinder information.Consider after various undesirable elements, field alert uses sound and light alarm.Such as there are LED lamplight warning, sight in dark surrounds There is sound warning blind area.
Present invention pressure uniline is short-circuit and broken thread detector is new technique device, using single-chip microcomputer as core, C language Control is programmed, detection reliability is high, and electricity consumption is low in energy consumption, meets modern low-carbon, the modern technologies theory of economizing on resources. And with following four function:1. installation's power source has good continuation of the journey function;2. the work(of line short and circuit breaking is detected Energy;3. remote alarm function;4. field alert function;Device is directly powered with low pressure uniline, operating voltage 220V, due to Other module operating voltages of device are 5V, need to mix electric pressure converter and 220V alternating currents are become into 5V direct currents, ensuring equipment is each Module is normally run, and reaches the purpose that each function is normally realized.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to skill of the invention Art scheme is modified or equivalent, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this Among the right of invention.

Claims (9)

1. the short circuit of low pressure uniline and disconnection detection device, it is characterised in that including:
Power module, it includes the first power supply module and the second power supply module;First power supply module is used to access low pressure list Phase line obtains 220V alternating currents, and generates low-voltage DC source signal, and line fault is provided with first power supply module Preliminary detection unit;Second power supply module is used to access battery, and generates low-voltage DC source signal;Described first supplies Handover module, and one of power supply mould of selection in the presence of handover module are connected between electric module and the second power supply module Block works;
Control module, it obtains the low-voltage DC source signal from power module and is operated, the control module electrical connection Line fault Preliminary detection unit, and based on the detection signal obtained from the line fault Preliminary detection unit, cut described in control Change module action;
Fault detection module, it includes line short fault detection unit and line disconnection failure detection unit, and the circuit is short Road fault detection unit includes being used to detect the electric current sensing unit of low pressure uniline curent change and for electric current to be sensed The induced-current that unit is produced is converted to voltage signal and the first output unit exported, the line disconnection failure detection unit Including for detecting the voltage induced unit of low pressure uniline voltage change and sensing for voltage induced unit to be produced Voltage signal is compared the second output unit of output, the line short fault detection unit and line disconnection failure detection Unit is electrically connected to control module, to detect signal to control module output is corresponding;And
Alarm module, it is electrically connected to the control module, and alarm signal is sent with the instruction of receive and control module.
2. low pressure uniline short circuit as claimed in claim 1 and disconnection detection device, it is characterised in that first power supply Module includes:
Low pressure uniline, it provides 220V alternating currents;
The A/D converting units being made up of transformer unit and rectification unit, it is used for the step-down of 220V alternating currents, is rectified into low pressure Direct current signal;With
8/5 voltage reduction module, it is electrically connected to the A/D converting units by handover module, for being switched to this when handover module When first power supply module works, low-voltage dc signal is converted into low-voltage DC source signal.
3. low pressure uniline short circuit as claimed in claim 2 and disconnection detection device, it is characterised in that the line fault Preliminary detection unit is constituted using relay K1;Wherein,
The trigger winding two ends of the relay K1 are respectively connected to the live wire and zero line of low pressure uniline,
The output loop two ends of the relay K1 connect respectively and control module one of input, with when coil it is logical During power off corresponding level signal is transmitted to control module.
4. low pressure uniline short circuit as claimed in claim 2 or claim 3 and disconnection detection device, it is characterised in that described second Power supply module includes:
Battery, it provides 8V direct currents;
Hand switch SB1, its one end access battery, the other end accesses 8/5 voltage reduction module through handover module;
When handover module is switched to the second power supply module work, by closing hand switch SB1 so that battery is control Module for power supply processed.
5. low pressure uniline short circuit as claimed in claim 4 and disconnection detection device, it is characterised in that the handover module Including:
Relay K2 and the first drive circuit of control relay K2 trigger windings energization action, the output of the relay K2 are returned Road is connected between A/D converting units and 8/5 voltage reduction module, and first drive circuit is connected to control module, for receiving Whether the instruction that control module is sent is powered so as to control relay K2 trigger windings;And
Relay K3 and the second drive circuit of control relay K3 trigger windings energization action, the output of the relay K3 are returned Road is connected between hand switch SB1 and 8/5 voltage reduction module, and second drive circuit is connected to control module, for receiving Whether the instruction that control module is sent is powered so as to control relay K3 trigger windings.
6. low pressure uniline short circuit as claimed in claim 5 and disconnection detection device, it is characterised in that short in the circuit In the fault detection unit of road,
The electric current acquiring unit is using the current transformer T4 of open-type, the curent change for detecting low pressure uniline, And produce corresponding induced-current;
First output unit includes:
It is connected to the current-limiting resistance R28 and voltage-regulator diode D6 at current transformer T4 output lateral coils two ends, voltage-regulator diode D6 Plus earth;With the voltage follower being made up of amplifier U7A, amplifier U7A in-phase input end is connected to voltage-regulator diode D6 Negative electrode, output end through resistance R12 draw, and resistance R12 output also through electric capacity C13 be grounded.
7. low pressure uniline short circuit as claimed in claim 6 and disconnection detection device, it is characterised in that disconnected in the circuit In line fault detection unit,
The voltage acquisition unit is using transformer T1 or the voltage transformer of open-type, the electricity for detecting low pressure uniline Buckling, and produce corresponding induced voltage;
Second output unit includes:
The comparator circuit being made up of amplifier U6A, amplifier U6A in-phase input end is connected to voltage acquisition unit through resistance R7, Amplifier U6A inverting input is grounded through resistance R9, and amplifier U6A output end is drawn, while being connected to through resistance R10 through resistance R8 Inverting input, and resistance R8 output also through electric capacity C15 be grounded.
8. low pressure uniline short circuit as claimed in claim 7 and disconnection detection device, it is characterised in that the alarm module Including wherein one or more in LED alarm units, buzzer warning unit and remote alert unit.
9. low pressure uniline short circuit as claimed in claim 8 and disconnection detection device, it is characterised in that the remote alarms Unit includes GSM/GPRS modular circuits, SIM Card circuits and antenna, and wherein GSM/GPRS modular circuits are connected to control mould Block, the SIM Card circuits and the antenna are connected to GSM/GPRS modular circuits.
CN201710151772.9A 2017-03-15 2017-03-15 The short circuit of low pressure uniline and disconnection detection device Pending CN106950458A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109633362A (en) * 2019-01-30 2019-04-16 努比亚技术有限公司 Intelligent terminal designs circuit, intelligent terminal and intelligent terminal method for detecting short circuit
CN110907863A (en) * 2019-12-10 2020-03-24 湖南优利泰克自动化系统有限公司 Analog input channel wiring state detection method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109633362A (en) * 2019-01-30 2019-04-16 努比亚技术有限公司 Intelligent terminal designs circuit, intelligent terminal and intelligent terminal method for detecting short circuit
CN110907863A (en) * 2019-12-10 2020-03-24 湖南优利泰克自动化系统有限公司 Analog input channel wiring state detection method and system

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