CN102914725B - Medium-voltage power distribution network fault monitoring device - Google Patents
Medium-voltage power distribution network fault monitoring device Download PDFInfo
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- CN102914725B CN102914725B CN201210254973.9A CN201210254973A CN102914725B CN 102914725 B CN102914725 B CN 102914725B CN 201210254973 A CN201210254973 A CN 201210254973A CN 102914725 B CN102914725 B CN 102914725B
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Abstract
The invention discloses a medium-voltage power distribution network fault monitoring device. The medium-voltage power distribution network fault monitoring device comprises an information acquisition system and an information processing terminal, and also comprises an information processing terminal and/or a handheld terminal, wherein the information acquisition system comprises a zero sequence CT, a short circuit CT module, a zero sequence current monitoring module, a short circuit current monitoring module, a micro controller unit (MCU) and a first communication module. According to the medium-voltage power distribution network fault monitoring device, a zero sequence voltage transformer does not need to be connected in, a zero sequence current transformer is directly used for monitoring a single-phase grounding fault, zero sequence current can be calculated and processed by combining the information processing terminal, and a place where the fault occurs can be positioned. The device is low in cost, simple in implementation manner, accurate and convenient. Besides, power can be acquired directly from a power distribution cable without connecting another power supply unit, so that the device can operate stably and timely. The medium-voltage power distribution network fault monitoring device with the excellent performance can be widely applied to a medium-voltage power distribution network.
Description
Technical field
The present invention relates to a kind of distribution network failure monitoring device, particularly relate to a kind of fault monitoring device of medium voltage distribution network.
Background technology
Medium voltage distribution network is the capillary of electric system, and its total length is longer than the sustainer-ultra-high-tension power transmission line of electric system far away.And also there is a large amount of overhead transmission lines in Urban Fringe and the outer suburbs in medium voltage distribution network, these overhead transmission lines are all often multipoint lines, safe reliability is poor, run into the inclement weathers such as blowing and raining, very easily produce single-phase earthing and short trouble, have a strong impact on the safe and reliable power supply of electrical network.And middle pressure overhead transmission line is general only to line configuring overcurrent protection, fast tripping protection, reclosing protection.These characteristics, makes the probability of line fault strengthen, searches difficulty once break down, particularly when circuit generation single-phase earthing, because trouble spot is difficult to determine, often delay accident treatment, cause failure propagation, be further development of phase fault, or damage electrical equipment.For above-mentioned situation, suitable fault monitoring device need be configured in medium voltage distribution network.At present, the fault monitoring device applied in middle voltage distribution networks, mostly need three-phase zero sequence PT(voltage transformer (VT)) and zero sequence CT(current transformer), residual voltage when occurring by obtaining fault and electric current carry out malfunction monitoring, this fault monitoring device not only cost is very high, and because the access of three-phase zero sequence PT, need access section sub-coil, easily electromagnetic interference (EMI) is caused to electrical network.And it is carry out the mode of powering by external power-supply unit that the power supply of most of fault monitoring device obtains, and this makes to run into a lot of problem in practical application.
Summary of the invention
In order to solve above-mentioned technical matters, the invention provides that a kind of cost is low, implementation simple but accurately, the medium voltage distribution network fault monitoring device of directly power taking from electrical network.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of medium voltage distribution network fault monitoring device, comprise information acquisition system, also comprise the information processing terminal and/or handheld terminal, described information acquisition system comprises: zero sequence CT, short circuit CT module, zero-sequence current monitoring modular, short-circuit current monitoring modular, MCU, the first communication module; Wherein,
Zero sequence CT, for gathering the zero sequence current signal of power distribution network, and is transferred to zero-sequence current monitoring modular by described zero sequence current signal;
Short circuit CT module, for gathering the short-circuit current signal of power distribution network, and by described short-circuit current Signal transmissions to short-circuit current monitoring modular;
Zero-sequence current monitoring modular, for sampling to described zero sequence current signal, computing, obtaining accurate residual voltage value, and described residual voltage value is sent to MCU;
Short-circuit current monitoring modular, for sampling to described short-circuit current signal, computing, obtaining accurate short circuit voltage value, and described short circuit voltage value is sent to MCU;
MCU, for receiving described residual voltage value and/or short circuit voltage value, calculates corresponding zero-sequence current value and/or short-circuit current value, and judges whether to exceed alarming threshold value, if exceed, then controls the first communication module and sends a warning message;
First communication module, for carrying out communication with the information processing terminal and/or handheld terminal.
Further, described short circuit CT module comprises the first short circuit CT and the second short circuit CT.
Further, described first short circuit CT and the second short circuit CT is arranged on the A phase of threephase cable, C phase cable respectively.
Further, described information acquisition system also comprises the supply module for powering.
Further, described supply module directly from the power taking of power distribution network electric coil, is powered to system.
Further, the described information processing terminal comprises:
Second communication module, for carrying out communication with information acquisition system, and outwards sends warning message;
One CPU, calculates for the warning information sent described information acquisition system, processes, realize localization of fault;
First display module, for showing described warning information and/or localization of fault result;
First power module, for powering to the described information processing terminal.
Further, the described information processing terminal also comprises the first load module.
Further, described MCU also stores the default phone number of receiving alarm information, and described first communication module is also for sending a warning message to described default phone number; Described handheld terminal is used for arranging alarming threshold value and/or default phone number, comprising:
Second load module;
Second display module;
3rd communication module, for carrying out communication with information acquisition system;
2nd CPU, for reading the alarming threshold value of information acquisition system and/or default phone number by the 3rd communication module, or according to the input information of the second load module, by the 3rd communication module, send the configuration information to described alarming threshold value and/or default phone number to information acquisition system;
Second source module, for powering to described handheld terminal.
Further, described MCU adopts MSP430F149 chip.
Further, described first communication module adopts SMI900A chip.
The invention has the beneficial effects as follows: a kind of electric network fault monitoring device of the present invention, do not need to access zero sequential potential transformer, direct employing zero sequence current mutual inductor is monitored singlephase earth fault, simultaneously, combining information processing terminal calculates zero-sequence current, processes, can position fault scene, cost is low, implementation is simple, accurately facilitates.Further, a kind of electric network fault monitoring device of the present invention, directly from power taking power distribution network cable, without the need to separately connecing power-supply unit during use, can be stablized, works in time by assurance device more.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is a kind of medium voltage distribution network fault monitoring device structured flowchart of the present invention;
Fig. 2 is the circuit diagram of the zero-sequence current monitoring module of a kind of medium voltage distribution network fault monitoring device of the present invention;
Fig. 3 is the short-circuit current monitoring module circuit diagram of a kind of medium voltage distribution network fault monitoring device of the present invention;
Fig. 4 is the supply module circuit diagram of a kind of medium voltage distribution network fault monitoring device of the present invention;
Fig. 5 is the first communication module circuit diagram of a kind of medium voltage distribution network fault monitoring device of the present invention.
Embodiment
For the ease of following description, first, the description of some basic terms is provided:
cT:Current Transformer, current transformer.
PT:Potential Transformer, voltage transformer (VT).
MCU:Micro Control Unit, micro-control unit, also known as one chip microcomputer or single-chip microcomputer.
With reference to Fig. 1, the invention provides a kind of medium voltage distribution network fault monitoring device, comprise information acquisition system, also comprise the information processing terminal and/or handheld terminal, described information acquisition system comprises: zero sequence CT, short circuit CT module, zero-sequence current monitoring modular, short-circuit current monitoring modular, MCU, the first communication module; Wherein,
Zero sequence CT, for gathering the zero sequence current signal of power distribution network, and is transferred to zero-sequence current monitoring modular by described zero sequence current signal;
Short circuit CT module, for gathering the short-circuit current signal of power distribution network, and by described short-circuit current Signal transmissions to short-circuit current monitoring modular;
Zero-sequence current monitoring modular, for sampling to described zero sequence current signal, computing, obtaining accurate residual voltage value, and described residual voltage value is sent to MCU;
Short-circuit current monitoring modular, for sampling to described short-circuit current signal, computing, obtaining accurate short circuit voltage value, and described short circuit voltage value is sent to MCU;
MCU, for receiving described residual voltage value and/or short circuit voltage value, calculates corresponding zero-sequence current value and/or short-circuit current value, and judges whether to exceed alarming threshold value, if exceed, then controls the first communication module and sends a warning message;
First communication module, for carrying out communication with the information processing terminal and/or handheld terminal.
Further, described short circuit CT module comprises the first short circuit CT and the second short circuit CT.
Further, described first short circuit CT and the second short circuit CT is arranged on the A phase of threephase cable, C phase cable respectively.
Further, described information acquisition system also comprises the supply module for powering.
Further, described supply module directly from the power taking of power distribution network electric coil, is powered to system.
Further, the described information processing terminal comprises:
Second communication module, for carrying out communication with information acquisition system, and outwards sends warning message;
One CPU, calculates for the warning information sent described information acquisition system, processes, realize localization of fault;
First display module, for showing described warning information and/or localization of fault result;
First power module, for powering to the described information processing terminal.
Further, the described information processing terminal also comprises the first load module.
Further, described MCU also stores the default phone number of receiving alarm information, and described first communication module is also for sending a warning message to described default phone number; Described handheld terminal is used for arranging alarming threshold value and/or default phone number, comprising:
Second load module;
Second display module;
3rd communication module, for carrying out communication with information acquisition system;
2nd CPU, for reading the alarming threshold value of information acquisition system and/or default phone number by the 3rd communication module, or according to the input information of the second load module, by the 3rd communication module, send the configuration information to described alarming threshold value and/or default phone number to information acquisition system;
Second source module, for powering to described handheld terminal.
Adopt handheld terminal, within the scope of range information acquisition terminal 50 meters, parameter modification can be carried out by wireless communication mode to information acquisition terminal, alarming threshold value and/or default phone number are set, easy to operate, safety.
Information acquisition system principle of work is:
When there being singlephase earth fault to occur, the zero-sequence current of faulty line equals the capacitive earth current summation of the whole network except faulty line.The zero-sequence current of regular link equals the capacitive earth current of this circuit.In advance according to the zero-sequence current setting valve of the actual conditions initialization system of circuit, i.e. alarming threshold value.
With reference to Fig. 2, when singlephase earth fault occurs, zero sequence CT collects zero sequence current signal, and zero-sequence current monitoring modular carries out rectification, amplitude limit to this zero sequence current signal, AC signal is converted to the residual voltage value of direct current, and is delivered to MCU.In circuit diagram, resistance R9 allows the zero sequence current signal of input change corresponding voltage signal into, diode D1, diode D4, and diode D5 and diode D21 is to this voltage signal amplitude limit effect, and diode D21 is the voltage stabilizing diode of 3.3V.TLV341 is low consumed power operational amplifier, here conduct proportional amplifier in the same way, and MCU controls its 5th pin (/SHDN) and closes its work.Diode D3 is commutation diode, the cut-off of interchange negative half period, by the filter filtering of resistance R8 and electric capacity C3, electric capacity C2 composition, and the residual voltage value of stable output.MCU samples to residual voltage value, just can converse the zero-sequence current value of input according to its numerical value.Whether MCU exceedes the alarming threshold value of default according to zero-sequence current value, judges whether system singlephase earth fault occurs.When there is singlephase earth fault, by the first communication module, send the warning information such as the zero-sequence current value detected to the information processing terminal.The information processing terminal, according to the information determination fault generation section received, realizes localization of fault; Also outwards warning message can be sent according to arranging.Or when there is singlephase earth fault, MCU, by the first communication module, sends a warning message to default phone number.
When there being short trouble to occur, A, C phase short-circuit current mutual inductor of system, detects short-circuit current signal.Short-circuit current monitoring modular carries out rectification to this short-circuit current signal and is converted to short circuit voltage value, and transmit to MCU, MCU carries out the calculating of short-circuit current value by this short circuit voltage value.System presets the alarming threshold value of short-circuit current.
With reference to Fig. 3, when cable is alternate be short-circuited time, short-circuit current mutual inductor detects short-circuit current signal, short-circuit current monitoring modular carries out filtering, rectification, amplitude limit to this short-circuit current signal, obtain the short circuit voltage value of direct current, produce a negative edge pulse simultaneously, send MCU to together with this short-circuit voltage signal.4 diode composition full-wave rectification bridges carry out rectification to short-circuit current signal, obtain the signal of approximate DC, then by the filter network that resistance and electric capacity form, obtain the short circuit voltage value of stable direct current.This short circuit voltage value carries out limited amplitude protection by voltage stabilizing diode D8, voltage stabilizing diode D11, and resistance R31 and resistance R28 carries out dividing potential drop, and the voltage of last approximately about 1.6V is input to Sheffer stroke gate 74HC14, produces the pulse of a negative edge.MCU has no progeny in being caused by this pulse, carries out AD sampling to the short circuit voltage value through resistance R23 and resistance R24 dividing potential drop, converses the size of short-circuit current value by obtaining short circuit voltage value.Whether MCU exceedes the alarming threshold value of Operation system setting according to short-circuit current value, judges whether system is short-circuited fault.When be short-circuited fault time, by the first communication module, the warning information such as short-circuit current value are sent to the information processing terminal.The information processing terminal, according to the information determination fault generation section received, realizes localization of fault; Also outwards warning message can be sent according to arranging.Or, when be short-circuited fault time, MCU by the first communication module, sends a warning message to default phone number.
Supply module is powered to whole system, and to the charging of built-in standby lithium pond, lithium battery is operated in floating charge state at ordinary times, when the power-off of power distribution network cable cannot obtain power supply, and can as the back-up source of system to system power supply.
With reference to Fig. 4, supply module is directly from power taking the cable of power distribution network.In figure, six diodes carry out half-wave rectification to the electric current that the electricity taking coil on every phase cable obtains respectively, because the current phase of every phase differs 120 ° respectively, form full-wave rectification.Electric capacity E15 plays smothing filtering.Resistance R29, resistance R30 effect is when voltage amplitude is excessive, field effect transistor Q3 conducting, and the at this moment pressure drop overwhelming majority is assigned on resistance R29 and resistance R30, protection late-class circuit.Voltage stabilizing diode TVS5 and resistance R35 will be 6.5V to the voltage export-restriction of rear class.Electric capacity C4 and electric capacity E14 plays filtering and energy storage effect respectively.
With reference to Fig. 5, the first communication module is used for carrying out communication with the information processing terminal.In figure, U4 is main operating die SIM900A, the U6 of short message receiving-transmitting is SIM card deck, and U7 is electrostatic defending chip.In the present embodiment, the second communication module, the 3rd communication module also adopt the embodiment of Fig. 5.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (9)
1. a medium voltage distribution network fault monitoring device, it is characterized in that, comprise information acquisition system, also comprise the information processing terminal and/or handheld terminal, described information acquisition system comprises: zero sequence current mutual inductor, short-circuit current mutual inductor module, zero-sequence current monitoring modular, short-circuit current monitoring modular, MCU, the first communication module; Wherein,
Zero sequence current mutual inductor, for gathering the zero sequence current signal of power distribution network, and is transferred to zero-sequence current monitoring modular by described zero sequence current signal;
Short-circuit current mutual inductor module, for gathering the short-circuit current signal of power distribution network, and by described short-circuit current Signal transmissions to short-circuit current monitoring modular;
Zero-sequence current monitoring modular, for sampling to described zero sequence current signal, computing, obtaining accurate residual voltage value, and described residual voltage value is sent to MCU;
Short-circuit current monitoring modular, for sampling to described short-circuit current signal, computing, obtaining accurate short circuit voltage value, and described short circuit voltage value is sent to MCU;
MCU, for receiving described residual voltage value and/or short circuit voltage value, calculates corresponding zero-sequence current value and/or short-circuit current value, and judges whether to exceed alarming threshold value, if exceed, then controls the first communication module and sends a warning message;
First communication module, for carrying out communication with the information processing terminal and/or handheld terminal;
Described MCU also stores the default phone number of receiving alarm information, and described first communication module is also for sending a warning message to described default phone number; Described handheld terminal is used for arranging alarming threshold value and/or default phone number, comprising:
Second load module;
Second display module;
3rd communication module, for carrying out communication with information acquisition system;
2nd CPU, for reading the alarming threshold value of information acquisition system and/or default phone number by the 3rd communication module, or according to the input information of the second load module, by the 3rd communication module, send the configuration information to described alarming threshold value and/or default phone number to information acquisition system;
Second source module, for powering to described handheld terminal.
2. a kind of medium voltage distribution network fault monitoring device according to claim 1, is characterized in that: described short-circuit current mutual inductor module comprises the first short-circuit current mutual inductor and the second short-circuit current mutual inductor.
3. a kind of medium voltage distribution network fault monitoring device according to claim 2, is characterized in that: described first short-circuit current mutual inductor and the second short-circuit current mutual inductor are arranged on the A phase of threephase cable, C phase cable respectively.
4. a kind of medium voltage distribution network fault monitoring device according to claim 3, is characterized in that: described information acquisition system also comprises the supply module for powering.
5. a kind of medium voltage distribution network fault monitoring device according to claim 4, is characterized in that: described supply module directly from the power taking of power distribution network electric coil, is powered to system.
6. a kind of medium voltage distribution network fault monitoring device according to any one of claim 1-5, is characterized in that: the described information processing terminal comprises:
Second communication module, for carrying out communication with information acquisition system, and outwards sends warning message;
One CPU, calculates for the warning information sent described information acquisition system, processes, realize localization of fault;
First display module, for showing described warning information and/or localization of fault result;
First power module, for powering to the described information processing terminal.
7. a kind of medium voltage distribution network fault monitoring device according to claim 6, is characterized in that: the described information processing terminal also comprises the first load module.
8. a kind of medium voltage distribution network fault monitoring device according to any one of claim 1-5, is characterized in that: described MCU adopts MSP430F149 chip.
9. a kind of medium voltage distribution network fault monitoring device according to any one of claim 1-5, is characterized in that: described first communication module adopts SMI900A chip.
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| CN103278733B (en) * | 2013-05-30 | 2016-08-10 | 国家电网公司 | A kind of cable grounding remote monitoring method and Long-Range Surveillance System |
| CN109669093A (en) * | 2018-12-13 | 2019-04-23 | 南京正锐电力科技有限公司 | A kind of non-effectively earthed system line-to-ground fault detection method |
| CN110865279A (en) * | 2019-12-10 | 2020-03-06 | 苏州银蕨电力科技有限公司 | Single-phase earth fault positioning method based on neutral point earth current starting |
| CN110888022B (en) * | 2019-12-20 | 2021-10-08 | 海南电网有限责任公司电力科学研究院 | Single-phase earth fault detection and positioning device for power distribution network |
| CN111624440A (en) * | 2020-05-26 | 2020-09-04 | 襄阳科能机电设备有限公司 | Single phase grounding fault line selection device in neutral point through arc suppression coil grounding system |
| CN113848399A (en) * | 2020-06-28 | 2021-12-28 | 广东威特真空电子制造有限公司 | Microwave oven and magnetron detection device |
| CN113295965A (en) * | 2021-05-25 | 2021-08-24 | 国网山东省电力公司济南市济阳区供电公司 | Distribution network ground fault positioning method, system and terminal |
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Effective date of registration: 20151110 Address after: 510000 B12, 21 / F, 111 West Sports Road, Guangzhou, Guangdong, Tianhe District, ABCD1 Patentee after: GUANGZHOU TOPWHIP TECHNOLOGY Co.,Ltd. Address before: 510620 Ren Feng building, 490 Tianhe Road, Guangdong, Guangzhou 3407, China Patentee before: Wang Daolong |
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