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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- 238000012806 monitoring device Methods 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 32
- 230000010365 information processing Effects 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000003284 homeostatic effect Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
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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 invention relates to a fault monitoring device for a power distribution network, in particular to a fault monitoring device for a medium-voltage power distribution network.
Background
The medium voltage distribution network is a capillary vessel of the power system, the total length of which is much longer than the main artery-high voltage transmission line of the power system. And a large number of overhead transmission lines exist in the suburb and suburb areas of the city in the medium-voltage distribution network, the overhead transmission lines are usually multi-branch lines, safety and reliability are poor, single-phase grounding and short-circuit faults are easily caused in severe weather such as wind and rain, and the safe and reliable power supply of the power grid is seriously influenced. Moreover, medium voltage overhead lines are generally provided with overcurrent protection, quick-break protection and reclosing protection only. Due to the characteristics, the probability of line faults is increased, once the faults are found difficultly, particularly when the lines are grounded in a single phase, the fault point is difficult to determine, so that the fault processing is delayed, the fault expansion is caused, and the fault is further developed into an interphase short circuit or the electric equipment is damaged. In view of the above, appropriate fault monitoring equipment needs to be configured in the medium voltage distribution network. At present, most fault monitoring equipment applied in a medium-voltage distribution network needs a three-phase zero-sequence PT (voltage transformer) and a zero-sequence CT (current transformer), fault monitoring is carried out by acquiring zero-sequence voltage and current when a fault occurs, the cost of the fault monitoring equipment is very high, and due to the fact that the three-phase zero-sequence PT is connected, a part of coils need to be connected, and electromagnetic interference is easily caused to a power grid. And most of fault monitoring equipment obtains power supply through external power supply equipment, which causes many problems in practical application.
Disclosure of Invention
In order to solve the technical problems, the invention provides the medium-voltage distribution network fault monitoring device which is low in cost, simple in implementation mode, accurate and capable of directly getting electricity from a power grid.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a medium voltage distribution network fault monitoring device, includes information acquisition system, still includes information processing terminal and/or handheld terminal, information acquisition system includes: the system comprises a zero sequence CT module, a short circuit CT module, a zero sequence current monitoring module, a short circuit current monitoring module, an MCU and a first communication module; wherein,
the zero sequence CT is used for acquiring a zero sequence current signal of the power distribution network and transmitting the zero sequence current signal to the zero sequence current monitoring module;
the short circuit CT module is used for acquiring a short circuit current signal of the power distribution network and transmitting the short circuit current signal to the short circuit current monitoring module;
the zero sequence current monitoring module is used for sampling and calculating the zero sequence current signal to obtain an accurate zero sequence voltage value and sending the zero sequence voltage value to the MCU;
the short-circuit current monitoring module is used for sampling and calculating the short-circuit current signal to obtain an accurate short-circuit voltage value and sending the short-circuit voltage value to the MCU;
the MCU is used for receiving the zero sequence voltage value and/or the short-circuit voltage value, calculating a corresponding zero sequence current value and/or a corresponding short-circuit current value, judging whether the zero sequence current value and/or the short-circuit current value exceed an alarm threshold value, and controlling the first communication module to send alarm information if the zero sequence current value and/or the short-circuit current value exceed the alarm threshold value;
and the first communication module is used for communicating with the information processing terminal and/or the handheld terminal.
Further, the short circuit CT module includes a first short circuit CT and a second short circuit CT.
Further, the first short circuit CT and the second short circuit CT are respectively installed on the a-phase cable and the C-phase cable of the three-phase cable.
Further, the information acquisition system also comprises a power supply module for supplying power.
Furthermore, the power supply module directly gets power from the electric coil of the power distribution network to supply power to the system.
Further, the information processing terminal includes:
the second communication module is used for communicating with the information acquisition system and sending alarm information to the outside;
the first CPU is used for calculating and processing the alarm information sent by the information acquisition system to realize fault positioning;
the first display module is used for displaying the alarm information and/or the fault positioning result;
and the first power supply module is used for supplying power to the information processing terminal.
Further, the information processing terminal also comprises a first input module.
Further, the MCU also stores a preset mobile phone number for receiving alarm information, and the first communication module is also used for sending the alarm information to the preset mobile phone number; the hand-held terminal is used for setting an alarm threshold value and/or a preset mobile phone number, and comprises the following steps:
a second input module;
a second display module;
the third communication module is used for communicating with the information acquisition system;
the second CPU is used for reading an alarm threshold value and/or a preset mobile phone number of the information acquisition system through the third communication module, or sending setting information of the alarm threshold value and/or the preset mobile phone number to the information acquisition system through the third communication module according to input information of the second input module;
and the second power supply module is used for supplying power to the handheld terminal.
Further, the MCU adopts an MSP430F149 chip.
Further, the first communication module adopts an SMI900A chip.
The invention has the beneficial effects that: the power grid fault monitoring device provided by the invention has the advantages that a zero sequence voltage transformer is not required to be connected, the zero sequence current transformer is directly adopted to monitor the single-phase earth fault, meanwhile, the zero sequence current is calculated and processed by combining the information processing terminal, the fault occurrence place can be positioned, the cost is low, and the implementation mode is simple, accurate and convenient. In addition, the power grid fault monitoring device provided by the invention directly gets power from a power distribution network cable, and is not required to be additionally connected with power supply equipment during use, so that the device can be ensured to work more stably and timely.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a block diagram of a fault monitoring device for a medium voltage distribution network according to the present invention;
fig. 2 is a circuit diagram of a zero sequence current monitoring module of a medium voltage distribution network fault monitoring apparatus of the present invention;
fig. 3 is a circuit diagram of a short-circuit current monitoring module of a fault monitoring device for a medium voltage distribution network according to the present invention;
fig. 4 is a circuit diagram of a power supply module of a fault monitoring device for a medium voltage distribution network according to the present invention;
fig. 5 is a circuit diagram of a first communication module of a fault monitoring device for a medium voltage distribution network according to the present invention.
Detailed Description
To facilitate the following description, first, a description of some basic terms is given:
CT: current Transformer, Current Transformer.
PT: potential Transformer, voltage Transformer.
MCU: the Micro Control Unit is also called a single-chip microcomputer or a single-chip microcomputer.
Referring to fig. 1, the invention provides a fault monitoring device for a medium voltage distribution network, which comprises an information acquisition system, an information processing terminal and/or a handheld terminal, wherein the information acquisition system comprises: the system comprises a zero sequence CT module, a short circuit CT module, a zero sequence current monitoring module, a short circuit current monitoring module, an MCU and a first communication module; wherein,
the zero sequence CT is used for acquiring a zero sequence current signal of the power distribution network and transmitting the zero sequence current signal to the zero sequence current monitoring module;
the short circuit CT module is used for acquiring a short circuit current signal of the power distribution network and transmitting the short circuit current signal to the short circuit current monitoring module;
the zero sequence current monitoring module is used for sampling and calculating the zero sequence current signal to obtain an accurate zero sequence voltage value and sending the zero sequence voltage value to the MCU;
the short-circuit current monitoring module is used for sampling and calculating the short-circuit current signal to obtain an accurate short-circuit voltage value and sending the short-circuit voltage value to the MCU;
the MCU is used for receiving the zero sequence voltage value and/or the short-circuit voltage value, calculating a corresponding zero sequence current value and/or a corresponding short-circuit current value, judging whether the zero sequence current value and/or the short-circuit current value exceed an alarm threshold value, and controlling the first communication module to send alarm information if the zero sequence current value and/or the short-circuit current value exceed the alarm threshold value;
and the first communication module is used for communicating with the information processing terminal and/or the handheld terminal.
Further, the short circuit CT module includes a first short circuit CT and a second short circuit CT.
Further, the first short circuit CT and the second short circuit CT are respectively installed on the a-phase cable and the C-phase cable of the three-phase cable.
Further, the information acquisition system also comprises a power supply module for supplying power.
Furthermore, the power supply module directly gets power from the electric coil of the power distribution network to supply power to the system.
Further, the information processing terminal includes:
the second communication module is used for communicating with the information acquisition system and sending alarm information to the outside;
the first CPU is used for calculating and processing the alarm information sent by the information acquisition system to realize fault positioning;
the first display module is used for displaying the alarm information and/or the fault positioning result;
and the first power supply module is used for supplying power to the information processing terminal.
Further, the information processing terminal also comprises a first input module.
Further, the MCU also stores a preset mobile phone number for receiving alarm information, and the first communication module is also used for sending the alarm information to the preset mobile phone number; the hand-held terminal is used for setting an alarm threshold value and/or a preset mobile phone number, and comprises the following steps:
a second input module;
a second display module;
the third communication module is used for communicating with the information acquisition system;
the second CPU is used for reading an alarm threshold value and/or a preset mobile phone number of the information acquisition system through the third communication module, or sending setting information of the alarm threshold value and/or the preset mobile phone number to the information acquisition system through the third communication module according to input information of the second input module;
and the second power supply module is used for supplying power to the handheld terminal.
By adopting the handheld terminal, the parameters of the information acquisition terminal can be modified in a wireless communication mode within a range of 50 meters away from the information acquisition terminal, and an alarm threshold value and/or a preset mobile phone number are/is set, so that the operation is convenient and safe.
The working principle of the information acquisition system is as follows:
when a single-phase earth fault occurs, the zero sequence current of the fault line is equal to the sum of the capacitance-to-earth currents of the whole network except the fault line. The zero sequence current of the normal line is equal to the capacitance current to ground of the line. And setting a zero sequence current setting value of the system, namely an alarm threshold value, in advance according to the actual condition of the line.
Referring to fig. 2, when a single-phase ground fault occurs, the zero-sequence CT acquires a zero-sequence current signal, and the zero-sequence current monitoring module rectifies and limits the zero-sequence current signal, converts an alternating current signal into a direct current zero-sequence voltage value, and transmits the direct current zero-sequence voltage value to the MCU. In the circuit diagram, a resistor R9 converts an input zero-sequence current signal into a corresponding voltage signal, a diode D1, a diode D4, a diode D5 and a diode D21 all have an amplitude limiting effect on the voltage signal, and a diode D21 is a 3.3V zener diode. TLV341 is a low power operational amplifier, here a homeostatic proportional amplifier, whose fifth leg (/ SHDN) is controlled by the MCU to turn off its operation. The diode D3 is a rectifier diode, cuts off the negative half cycle of alternating current, and outputs a stable zero sequence voltage value through filtering by a filter consisting of a resistor R8, a capacitor C3 and a capacitor C2. The MCU samples the zero sequence voltage value, and the input zero sequence current value can be converted according to the value. And the MCU judges whether the system has single-phase earth fault according to whether the zero-sequence current value exceeds the alarm threshold value set by the system. When single-phase earth fault occurs, the detected alarm information such as zero sequence current value is transmitted to the information processing terminal through the first communication module. The information processing terminal determines a fault occurrence section according to the received information to realize fault positioning; alarm information can also be sent outwards according to the setting. Or when the single-phase earth fault occurs, the MCU sends alarm information to a preset mobile phone number through the first communication module.
When a short-circuit fault occurs, A, C phase short-circuit current transformers of the system detect a short-circuit current signal. The short-circuit current monitoring module rectifies and converts the short-circuit current signal into a short-circuit voltage value, the short-circuit voltage value is transmitted to the MCU, and the MCU calculates the short-circuit current value through the short-circuit voltage value. The system presets an alarm threshold value of the short-circuit current.
Referring to fig. 3, when a short circuit occurs between cable phases, the short-circuit current transformer detects a short-circuit current signal, the short-circuit current monitoring module performs filtering, rectification and amplitude limiting on the short-circuit current signal to obtain a direct-current short-circuit voltage value, and simultaneously generates a falling edge pulse which is transmitted to the MCU together with the short-circuit voltage signal. 4 diodes form a full-wave rectifier bridge to rectify the short-circuit current signal to obtain a signal similar to direct current, and then a stable direct-current short-circuit voltage value is obtained through a filter network formed by a resistor and a capacitor. The short-circuit voltage value is subjected to amplitude limiting protection through a voltage stabilizing diode D8 and a voltage stabilizing diode D11, a resistor R31 and a resistor R28 divide the voltage, and finally about 1.6V of voltage is input into an NAND gate 74HC14 to generate a pulse with a falling edge. After the MCU is interrupted by the pulse, the short-circuit voltage value divided by the resistor R23 and the resistor R24 is subjected to AD sampling, and the short-circuit current value is converted by obtaining the short-circuit voltage value. And the MCU judges whether the system has a short-circuit fault according to whether the short-circuit current value exceeds an alarm threshold value set by the system. When short-circuit fault occurs, alarm information such as short-circuit current value is sent to the information processing terminal through the first communication module. The information processing terminal determines a fault occurrence section according to the received information to realize fault positioning; alarm information can also be sent outwards according to the setting. Or when short-circuit fault occurs, the MCU sends alarm information to a preset mobile phone number through the first communication module.
The power supply module supplies power to the whole system and charges a built-in standby lithium battery, the lithium battery works in a floating charging state at ordinary times, and when a power distribution network cable is powered off and a power supply cannot be acquired, the power supply module can be used as a standby power supply of the system to supply power to the system.
Referring to fig. 4, the power supply module directly takes power from the cable of the power distribution network. In the figure, six diodes respectively perform half-wave rectification on the current obtained by the coil on the cable of each phase, and because the phase difference of the current of each phase is 120 degrees, full-wave rectification is formed. The capacitor E15 functions as a smoothing filter. The resistor R29 and the resistor R30 have the function that when the voltage amplitude is too large, the field effect transistor Q3 is conducted, and most of the voltage drop is divided into the resistor R29 and the resistor R30 at the moment, so that a rear-stage circuit is protected. The zener diode TVS5 and the resistor R35 limit the voltage output to the subsequent stage to 6.5V. The capacitor C4 and the capacitor E14 respectively play roles in filtering and energy storage.
Referring to fig. 5, the first communication module is used for communicating with the information processing terminal. In the figure, U4 is a main working chip SIM900A for sending and receiving short messages, U6 is a SIM card holder, and U7 is an electrostatic protection chip. In this embodiment, the second communication module and the third communication module also adopt the implementation manner of fig. 5.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a medium voltage distribution network fault monitoring device, its characterized in that includes information acquisition system, still includes information processing terminal and/or handheld terminal, information acquisition system includes: the system comprises a zero sequence current transformer, a short-circuit current transformer module, a zero sequence current monitoring module, a short-circuit current monitoring module, an MCU and a first communication module; wherein,
the zero sequence current transformer is used for acquiring a zero sequence current signal of the power distribution network and transmitting the zero sequence current signal to the zero sequence current monitoring module;
the short-circuit current transformer module is used for acquiring a short-circuit current signal of the power distribution network and transmitting the short-circuit current signal to the short-circuit current monitoring module;
the zero sequence current monitoring module is used for sampling and calculating the zero sequence current signal to obtain an accurate zero sequence voltage value and sending the zero sequence voltage value to the MCU;
the short-circuit current monitoring module is used for sampling and calculating the short-circuit current signal to obtain an accurate short-circuit voltage value and sending the short-circuit voltage value to the MCU;
the MCU is used for receiving the zero sequence voltage value and/or the short-circuit voltage value, calculating a corresponding zero sequence current value and/or a corresponding short-circuit current value, judging whether the zero sequence current value and/or the short-circuit current value exceed an alarm threshold value, and controlling the first communication module to send alarm information if the zero sequence current value and/or the short-circuit current value exceed the alarm threshold value;
the first communication module is used for communicating with the information processing terminal and/or the handheld terminal;
the MCU is also used for storing a preset mobile phone number for receiving alarm information, and the first communication module is also used for sending the alarm information to the preset mobile phone number; the hand-held terminal is used for setting an alarm threshold value and/or a preset mobile phone number, and comprises the following steps:
a second input module;
a second display module;
the third communication module is used for communicating with the information acquisition system;
the second CPU is used for reading an alarm threshold value and/or a preset mobile phone number of the information acquisition system through the third communication module, or sending setting information of the alarm threshold value and/or the preset mobile phone number to the information acquisition system through the third communication module according to input information of the second input module;
and the second power supply module is used for supplying power to the handheld terminal.
2. A medium voltage distribution network fault monitoring device according to claim 1, characterized in that: the short-circuit current transformer module comprises a first short-circuit current transformer and a second short-circuit current transformer.
3. A medium voltage distribution network fault monitoring device according to claim 2, characterized in that: the first short-circuit current transformer and the second short-circuit current transformer are respectively arranged on the A-phase cable and the C-phase cable of the three-phase cable.
4. A medium voltage distribution network fault monitoring device according to claim 3, characterized in that: the information acquisition system also comprises a power supply module for supplying power.
5. A medium voltage distribution network fault monitoring device according to claim 4, characterized in that: the power supply module directly gets power from the electric coil of the power distribution network to supply power to the system.
6. A medium voltage distribution network fault monitoring device according to any of claims 1-5, characterized in that: the information processing terminal includes:
the second communication module is used for communicating with the information acquisition system and sending alarm information to the outside;
the first CPU is used for calculating and processing the alarm information sent by the information acquisition system to realize fault positioning;
the first display module is used for displaying the alarm information and/or the fault positioning result;
and the first power supply module is used for supplying power to the information processing terminal.
7. A medium voltage distribution network fault monitoring device according to claim 6, characterized in that: the information processing terminal also comprises a first input module.
8. A medium voltage distribution network fault monitoring device according to any of claims 1-5, characterized in that: the MCU adopts an MSP430F149 chip.
9. A medium voltage distribution network fault monitoring device according to any of claims 1-5, characterized in that: the first communication module adopts an SMI900A chip.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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