CN102914725A - Medium-voltage power distribution network fault monitoring device - Google Patents
Medium-voltage power distribution network fault monitoring device Download PDFInfo
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- CN102914725A CN102914725A CN2012102549739A CN201210254973A CN102914725A CN 102914725 A CN102914725 A CN 102914725A CN 2012102549739 A CN2012102549739 A CN 2012102549739A CN 201210254973 A CN201210254973 A CN 201210254973A CN 102914725 A CN102914725 A CN 102914725A
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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 medium voltage distribution network at Urban Fringe and the outer suburbs, these overhead transmission lines often all are 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, had 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 so that the probability of line fault strengthens, is searched difficulty in case break down, particularly when circuit generation single-phase earthing, owing to the trouble spot is difficult to determine, often incured loss through delay accident treatment, cause fault to enlarge, be further development of phase fault, perhaps damage electrical equipment.For above-mentioned situation, need the suitable fault monitoring device of configuration in medium voltage distribution network.At present, applied fault monitoring device in the middle voltage distribution networks, mostly need three-phase zero sequence PT(voltage transformer (VT)) and zero sequence CT(current transformer), residual voltage and electric current when occuring by obtaining fault carry out malfunction monitoring, this fault monitoring device not only cost is very high, and because the access of three-phase zero sequence PT needs the access coil sections, easily electrical network is caused electromagnetic interference (EMI).And it is the mode of powering by external power-supply unit that the power supply of most of fault monitoring device obtains, and this is so that run into a lot of problems in the 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 is simple but accurately, the direct medium voltage distribution network fault monitoring device of 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 be used for to gather the zero sequence current signal of power distribution network, and described zero sequence current signal is transferred to the zero-sequence current monitoring modular;
Short circuit CT module be used for to gather the short-circuit current signal of power distribution network, and described short-circuit current signal is transferred to the short-circuit current monitoring modular;
The zero-sequence current monitoring modular, be used for to described zero sequence current signal sample, computing, obtain accurate residual voltage value, and described residual voltage value sent to MCU;
The short-circuit current monitoring modular, be used for to described short-circuit current signal sample, computing, obtain accurate short-circuit voltage value, and described short-circuit voltage value sent to MCU;
MCU is used 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 surpass the alarming threshold value, if surpass, then controls the first communication module and sends a warning message;
The first communication module is used 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 the first short circuit CT and the second short circuit CT be installed in respectively threephase cable A mutually, on the C phase cable.
Further, described information acquisition system also comprises the supply module for power supply.
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:
The second communication module is used for carrying out communication with information acquisition system, and outwards sends warning message;
The one CPU, the warning information that is used for described information acquisition system is sent calculates, processes, and realizes localization of fault;
The first display module is used for showing described warning information and/or localization of fault result;
The first power module is used for the described information processing terminal is powered.
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 the first communication module also is used for sending a warning message to described default phone number; Described handheld terminal is used for alarming threshold value and/or default phone number are set, and comprising:
The second load module;
The second display module;
The 3rd communication module is used for carrying out communication with information acquisition system;
The 2nd CPU, be used for alarming threshold value and/or default phone number by the 3rd communication module reading information acquisition system, or according to the input message of the second load module, by the 3rd communication module, to the configuration information of information acquisition system transmission to described alarming threshold value and/or default phone number;
The second source module is used for described handheld terminal is powered.
Further, described MCU adopts the MSP430F149 chip.
Further, described the first communication module adopts the 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, directly adopt zero sequence current mutual inductor that singlephase earth fault is monitored, simultaneously, the combining information processing terminal calculates, processes zero-sequence current, can position the fault scene, cost is low, implementation is simple, accurately makes things convenient for.And directly power taking from the power distribution network cable of a kind of electric network fault monitoring device of the present invention need not to connect in addition power-supply unit during use, and is can assurance device more stable, work in time.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
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, at first, provide the description of some basic terms:
CT:Current Transformer, current transformer.
PT:Potential Transformer, voltage transformer (VT).
MCU:Micro Control Unit, micro-control unit claims again 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 be used for to gather the zero sequence current signal of power distribution network, and described zero sequence current signal is transferred to the zero-sequence current monitoring modular;
Short circuit CT module be used for to gather the short-circuit current signal of power distribution network, and described short-circuit current signal is transferred to the short-circuit current monitoring modular;
The zero-sequence current monitoring modular, be used for to described zero sequence current signal sample, computing, obtain accurate residual voltage value, and described residual voltage value sent to MCU;
The short-circuit current monitoring modular, be used for to described short-circuit current signal sample, computing, obtain accurate short-circuit voltage value, and described short-circuit voltage value sent to MCU;
MCU is used 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 surpass the alarming threshold value, if surpass, then controls the first communication module and sends a warning message;
The first communication module is used 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 the first short circuit CT and the second short circuit CT be installed in respectively threephase cable A mutually, on the C phase cable.
Further, described information acquisition system also comprises the supply module for power supply.
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:
The second communication module is used for carrying out communication with information acquisition system, and outwards sends warning message;
The one CPU, the warning information that is used for described information acquisition system is sent calculates, processes, and realizes localization of fault;
The first display module is used for showing described warning information and/or localization of fault result;
The first power module is used for the described information processing terminal is powered.
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 the first communication module also is used for sending a warning message to described default phone number; Described handheld terminal is used for alarming threshold value and/or default phone number are set, and comprising:
The second load module;
The second display module;
The 3rd communication module is used for carrying out communication with information acquisition system;
The 2nd CPU, be used for alarming threshold value and/or default phone number by the 3rd communication module reading information acquisition system, or according to the input message of the second load module, by the 3rd communication module, to the configuration information of information acquisition system transmission to described alarming threshold value and/or default phone number;
The second source module is used for described handheld terminal is powered.
Adopt handheld terminal, can in 50 meters scopes of range information acquisition terminal, carry out parameter modification by wireless communication mode to information acquisition terminal, alarming threshold value and/or default phone number are set, easy to operate, safety.
The information acquisition system principle of work is:
When having 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 occured, zero sequence CT collected zero sequence current signal, and the zero-sequence current monitoring modular carries out rectification, amplitude limit, AC signal is converted to the residual voltage value of direct current this zero sequence current signal, and is delivered to MCU.In the circuit diagram, resistance R 9 allows the zero sequence current signal of input change corresponding voltage signal into, diode D1, and all to this voltage signal amplitude limit effect, diode D21 is the voltage stabilizing diode of 3.3V for diode D4, diode D5 and diode D21.TLV341 is low consumed power operational amplifier, here as proportional amplifier in the same way, MCU control its 5th pin (/SHDN) close its work.Diode D3 is commutation diode, exchanging the negative half period cut-off, and by resistance R 8 and capacitor C 3, the filter filtering that capacitor C 2 forms, the residual voltage value of stable output.MCU samples to the residual voltage value, just can converse according to its numerical value the zero-sequence current value of input.Whether MCU surpasses the alarming threshold value of default according to the zero-sequence current value, judges whether system singlephase earth fault occurs.When singlephase earth fault occurs, by the first communication module, send the warning information such as zero-sequence current value that detect to the information processing terminal.The information processing terminal is determined fault generation section according to the information that receives, and realizes localization of fault; Also can be according to outside transmission warning message is set.Perhaps, when singlephase earth fault occured, MCU sent a warning message to default phone number by the first communication module.
When having short trouble to occur, the A of system, C phase short-circuit current mutual inductor detect the short-circuit current signal.The short-circuit current monitoring modular carries out rectification and is converted to the short-circuit voltage value this short-circuit current signal, transmits to MCU, and 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 when being short-circuited, the short-circuit current mutual inductor detects the short-circuit current signal, the 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 simultaneously a negative edge pulse, send MCU to this short-circuit voltage signal.4 diodes form full-wave rectification bridge the short-circuit current signal are carried out rectification, obtain the signal of approximate direct current, and the filter network that forms by resistance and electric capacity again obtains the stably short-circuit voltage value of direct current.This short-circuit voltage value is carried out limited amplitude protection by voltage stabilizing diode D8, voltage stabilizing diode D11, and resistance R 31 and resistance R 28 are carried out dividing potential drop, and the last approximately voltage 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, to carry out the AD sampling through the short-circuit voltage value of resistance R 23 and resistance R 24 dividing potential drops, converses the size of short-circuit current value by obtaining the short-circuit voltage value.Whether MCU surpasses the alarming threshold value that system arranges according to short-circuit current value, judges system's fault that whether is short-circuited.When being short-circuited fault, 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 is determined fault generation section according to the information that receives, and realizes localization of fault; Also can be according to outside transmission warning message is set.Perhaps, when being short-circuited fault, MCU sends a warning message to default phone number by the first communication module.
Supply module is powered to whole system, and to built-in lithium cell charging for subsequent use, lithium battery is operated in floating charge state at ordinary times, when the outage of power distribution network cable can't be obtained power supply, can be used as the back-up source of system to system power supply.
With reference to Fig. 4, directly power taking from the cable of power distribution network of supply module.Six diodes carry out half-wave rectification to the electric current that the electricity taking coil on every phase cable obtains respectively among the figure, because the current phase of every phase differs respectively 120 °, so form full-wave rectification.Electric capacity E15 plays smothing filtering.Resistance R 29, resistance R 30 effects are when voltage amplitude is excessive, field effect transistor Q3 conducting, the at this moment pressure drop overwhelming majority is assigned on resistance R 29 and the resistance R 30, the protection late-class circuit.Voltage stabilizing diode TVS5 and resistance R 35 will be restricted to 6.5V to the Voltage-output of rear class.Capacitor C 4 and electric capacity E14 play respectively filtering and energy storage effect.
With reference to Fig. 5, the first communication module is used for carrying out communication with the information processing terminal.U4 is the main work chip SIM900A of short message receiving-transmitting among the figure, and U6 is the SIM card deck, and U7 is the electrostatic defending chip.In the present embodiment, the second communication module, the 3rd communication module also adopt the embodiment of Fig. 5.
More than be that better enforcement of the present invention is specified, 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 of spirit of the present invention, the modification that these are equal to or replacement all are included in the application's claim limited range.
Claims (10)
1. 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 CT, short circuit CT module, zero-sequence current monitoring modular, short-circuit current monitoring modular, MCU, the first communication module; Wherein,
Zero sequence CT be used for to gather the zero sequence current signal of power distribution network, and described zero sequence current signal is transferred to the zero-sequence current monitoring modular;
Short circuit CT module be used for to gather the short-circuit current signal of power distribution network, and described short-circuit current signal is transferred to the short-circuit current monitoring modular;
The zero-sequence current monitoring modular, be used for to described zero sequence current signal sample, computing, obtain accurate residual voltage value, and described residual voltage value sent to MCU;
The short-circuit current monitoring modular, be used for to described short-circuit current signal sample, computing, obtain accurate short-circuit voltage value, and described short-circuit voltage value sent to MCU;
MCU is used 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 surpass the alarming threshold value, if surpass, then controls the first communication module and sends a warning message;
The first communication module is used for carrying out communication with the information processing terminal and/or handheld terminal.
2. a kind of medium voltage distribution network fault monitoring device according to claim 1, it is characterized in that: described short circuit CT module comprises the first short circuit CT and the second short circuit CT.
3. a kind of medium voltage distribution network fault monitoring device according to claim 2 is characterized in that: the A that described the first short circuit CT and the second short circuit CT are installed in respectively threephase cable mutually, on the C phase cable.
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 power supply.
5. a kind of medium voltage distribution network fault monitoring device according to claim 4, it is characterized in that: described supply module directly from the power taking of power distribution network electric coil, is powered to system.
6. each described a kind of medium voltage distribution network fault monitoring device according to claim 1-5, it is characterized in that: the described information processing terminal comprises:
The second communication module is used for carrying out communication with information acquisition system, and outwards sends warning message;
The one CPU, the warning information that is used for described information acquisition system is sent calculates, processes, and realizes localization of fault;
The first display module is used for showing described warning information and/or localization of fault result;
The first power module is used for the described information processing terminal is powered.
7. a kind of medium voltage distribution network fault monitoring device according to claim 6, it is characterized in that: the described information processing terminal also comprises the first load module.
8. each described a kind of medium voltage distribution network fault monitoring device according to claim 1-5, it is characterized in that: described MCU also stores the default phone number of receiving alarm information, and described the first communication module also is used for sending a warning message to described default phone number; Described handheld terminal is used for alarming threshold value and/or default phone number are set, and comprising:
The second load module;
The second display module;
The 3rd communication module is used for carrying out communication with information acquisition system;
The 2nd CPU, be used for alarming threshold value and/or default phone number by the 3rd communication module reading information acquisition system, or according to the input message of the second load module, by the 3rd communication module, to the configuration information of information acquisition system transmission to described alarming threshold value and/or default phone number;
The second source module is used for described handheld terminal is powered.
9. each described a kind of medium voltage distribution network fault monitoring device according to claim 1-5 is characterized in that: described MCU adopts the MSP430F149 chip.
10. each described a kind of medium voltage distribution network fault monitoring device according to claim 1-5 is characterized in that: described the first communication module adopts the SMI900A chip.
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| CN103278733A (en) * | 2013-05-30 | 2013-09-04 | 孟津县电业公司 | Cable ground connection remote monitoring method and remote monitoring 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 |
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| 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 |
| 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 |
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