阅读说明：本技术 一种配电网计量防护系统及方法 (Power distribution network metering protection system and method ) 是由 刘霞 吕梅 贺慧 张蓓 房敏 任龙飞 韩朔 宋天邦 王升旭 于 2020-11-30 设计创作，主要内容包括：本发明提供一种配电网计量防护系统及方法,包括电压监测单元、输出功率监测单元、供电继电器、MCU微控制单元、驱动单元、通信单元、远程监控服务器、供电继电器、电能表、磁场监测单元、电容单元；本发明通过监测和对比供电继电器的输出频率和和终端用户的消耗频率,识别窃电行为的发生与否,防止人为从电能表输入端分流窃取电量,并将监测到的数据储存于远程管理终端留作证据,同时也对利用强磁铁干扰电能表计量的行为进行监测,及时发现并阻止利用分流、强磁铁干扰等窃电手段盗取电力的不法行为。(The invention provides a power distribution network metering protection system and a power distribution network metering protection method, wherein the power distribution network metering protection system comprises a voltage monitoring unit, an output power monitoring unit, a power supply relay, an MCU (micro control unit), a driving unit, a communication unit, a remote monitoring server, a power supply relay, an electric energy meter, a magnetic field monitoring unit and a capacitor unit; the invention identifies whether electricity stealing behavior occurs or not by monitoring and comparing the output frequency of the power supply relay and the consumption frequency of a terminal user, prevents the electricity stealing behavior from shunting from the input end of the electric energy meter manually, stores the monitored data in a remote management terminal to be used as evidence, monitors the behavior of utilizing strong magnets to interfere the metering of the electric energy meter, and timely finds out and prevents illegal behaviors of stealing electricity by utilizing electricity stealing means such as shunting, strong magnet interference and the like.)

1. A power distribution network metering protection system, the system comprising:

the device comprises a voltage monitoring unit, an output power monitoring unit, a power supply relay, an MCU (microprogrammed control unit), a driving unit, a communication unit, a remote monitoring server, a power supply relay, an electric energy meter, a magnetic field monitoring unit and a capacitor unit;

the input end of the voltage monitoring unit is electrically connected with the output end of the power supply relay; the input end of the output power monitoring unit is electrically connected with the output end of the power supply relay; the input end of the MCU micro control unit is electrically connected with the output end of the voltage monitoring unit and the output end of the output power monitoring unit, and the output end of the MCU micro control unit is electrically connected with the input ends of the driving unit and the communication unit; the input end point of the driving unit is connected with the input end of the MCU, and the output end of the driving unit is electrically connected with the power supply relay; the communication unit is electrically connected with the output end of the MCU and is kept connected with the remote monitoring server in a wireless communication mode; the electric energy meter is arranged between the user side and the MCU and is electrically connected with the MCU; the magnetic field monitoring unit is arranged in the electric energy meter and is electrically connected with the MCU; the capacitance unit is electrically connected with the MCU.

2. The system of claim 1, further comprising:

the alarm module is arranged in the MCU, is used for generating alarm information when the MCU monitors that the circuit is abnormal and the electricity stealing behavior occurs, and sends the alarm information to the remote monitoring unit.

3. The system of claim 1, wherein the MCU microcontrol unit comprises:

an MCS-51 single chip with One Time Programming ROM (OTPROM).

4. A control method of a power distribution network metering protection system is characterized by comprising the following steps:

the MCU micro-control unit receives the output voltage V of the power supply relay monitored by the voltage monitoring unit, the output power P1 of the power supply relay monitored by the output power monitoring unit and the power consumption P2 monitored by the electric energy meter;

the MCU micro control unit stores the output voltage V of the power supply relay, the output power P1 of the power supply relay and the power consumption power P2 monitored by the electric energy meter at intervals of 5 seconds, and calculates the average value of the output voltage V in the period time by taking 30 minutes as a cycle periodV, P1, P2,And the serial number of the electric energy meter is synchronously sent to a remote management server;

when the following conditions are met, the MCU judges that the output voltage V of the power supply relay is unstable:

when the output voltage V of the power supply relay is in an unstable state, judging that the power supply relay has a fault, and sending alarm information to a remote monitoring server by an MCU (microprogrammed control unit);

when the output voltage V of the power supply relay is in a normal stable state, the following conditions are met, and the MCU judges that the electricity stealing behavior occurs on the circuit where the electric energy meter is located:

(P1-P2)/P1≥20％

the MCU micro control unit sends alarm information to a remote monitoring server;

and the MCU micro control unit sends a power supply termination instruction to the driving unit so that the power supply relay terminates the power supply to the circuit where the electric energy meter is positioned.

5. The method of claim 4, further comprising:

the MCU micro control unit receives the magnetic field intensity H of the electric energy meter monitored by the magnetic field monitoring unit, if the magnetic field intensity H of the electric energy meter is larger than a preset upper limit value, the electric energy meter is judged to have a behavior of utilizing the strong magnetic field to interfere with metering, and the MCU micro control unit sends a power supply stopping instruction to the driving unit and sends alarm information to the remote management server.

6. The method according to claim 4 or claim 5, wherein the content of the alert information comprises:

the identified electricity stealing behavior type, the output voltage V of the power supply relay, the output power P1 of the power supply relay, the power consumption power P2 monitored by the electric energy meter, the magnetic field intensity H of the electric energy meter, the serial number of the electric energy meter and the time;

the electricity stealing behavior types include: shunting and electricity stealing and strong magnetic field interference.

7. The method of claim 4, further comprising:

when the power supply line of the power supply relay end is in power failure, the electric quantity stored by the capacitor unit is started to supply power to the MCU micro control unit and the communication unit so as to maintain the detection state of the MCU micro control unit on the power supply line, maintain the communication connection between the communication unit and the remote control server and simultaneously send power failure alarm information to the remote control server.

Technical Field

The invention relates to the field of electric power metering safety, in particular to a power distribution network metering protection system and method.

Background

In recent years, the national power grid reduces the metering loss rate of the power distribution network by updating power distribution network equipment and improving protection and supervision of the power distribution network equipment, but the national power loss is caused by the occurrence of some electricity stealing problems, so that the requirements on the protection and metering monitoring of the power metering equipment are higher and higher.

Based on above-mentioned problem, there is the instantaneity poor with the mode of protection electric wire netting measurement in the prior art, the difficult scheduling problem of collecting evidence, especially there is certain degree of difficulty to the protection of stealing electric and interference measurement such as circuit reposition of redundant personnel, strong magnet interference, so need one set of real time monitoring circuit reposition of redundant personnel, strong magnet interference to steal electric action such as, and according to the automatic management and control power supply line of control analysis result, effectively reduce the scheme of stealing the electric loss.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, the present invention provides a power distribution network metering protection system and method to solve the above-mentioned technical problems.

In a first aspect, the present invention provides a power distribution network metering protection system, including:

the device comprises a voltage monitoring unit, an output power monitoring unit, a power supply relay, an MCU (microprogrammed control unit), a driving unit, a communication unit, a remote monitoring server, a power supply relay, an electric energy meter, a magnetic field monitoring unit and a capacitance unit.

The input end of the voltage monitoring unit is electrically connected with the output end of the power supply relay; the input end of the output power monitoring unit is electrically connected with the output end of the power supply relay; the input end of the MCU micro control unit is electrically connected with the output end of the voltage monitoring unit and the output end of the output power monitoring unit, and the output end of the MCU micro control unit is electrically connected with the input ends of the driving unit and the communication unit; the input end point of the driving unit is connected with the input end of the MCU, and the output end of the driving unit is electrically connected with the power supply relay; the communication unit is electrically connected with the output end of the MCU and is kept connected with the remote monitoring server in a wireless communication mode; the electric energy meter is arranged between the user side and the MCU and is electrically connected with the MCU; the magnetic field monitoring unit is arranged in the electric energy meter and is electrically connected with the MCU; the capacitance unit is electrically connected with the MCU.

Further, the system further comprises:

the alarm module is arranged in the MCU, is used for generating alarm information when the MCU monitors that the circuit is abnormal and the electricity stealing behavior occurs, and sends the alarm information to the remote monitoring unit.

Further, the MCU micro control unit includes:

an MCS-51 single chip with One Time Programming ROM (OTPROM).

In a second aspect, the present invention provides a control method for a power distribution network metering protection system, including:

the MCU micro-control unit receives the output voltage V of the power supply relay monitored by the voltage monitoring unit, the output power P1 of the power supply relay monitored by the output power monitoring unit and the power consumption P2 monitored by the electric energy meter;

the MCU micro control unit stores the output voltage V of the power supply relay, the output power P1 of the power supply relay and the power consumption power P2 monitored by the electric energy meter at intervals of 5 seconds, and calculates the average value of the output voltage V in the period time by taking 30 minutes as a cycle periodV, P1, P2,And the serial number of the electric energy meter is synchronously sent to the remote pipeAnd (4) a management server.

When the following conditions are met, the MCU judges that the output voltage V of the power supply relay is unstable:

when the output voltage V of the power supply relay is in an unstable state, the power supply relay is judged to have a fault, and the MCU sends alarm information to the remote monitoring server.

When the output voltage V of the power supply relay is in a normal stable state, the following conditions are met, and the MCU judges that the electricity stealing behavior occurs on the circuit where the electric energy meter is located:

(P1-P2)/P1≥20％

the MCU micro control unit sends alarm information to a remote monitoring server;

and the MCU micro control unit sends a power supply termination instruction to the driving unit so that the power supply relay terminates the power supply to the circuit where the electric energy meter is positioned.

Further, the method further comprises:

the MCU micro control unit receives the magnetic field intensity H of the electric energy meter monitored by the magnetic field monitoring unit, if the magnetic field intensity H of the electric energy meter is larger than a preset upper limit value, the electric energy meter is judged to have a behavior of utilizing strong magnetic interference for metering, and the MCU micro control unit sends a power supply stopping instruction to the driving unit and sends an alarm to the remote management server.

Further, the alarm information includes:

the method comprises the steps of identifying the type of electricity stealing behavior, the output voltage V of the power supply relay, the output power P1 of the power supply relay, the power consumption power P2 monitored by the electric energy meter, the magnetic field intensity H of the electric energy meter, the number of the electric energy meter and the time.

The electricity stealing behavior types include: shunting and electricity stealing and strong magnetic field interference.

Further, the method further comprises:

when the power supply line of the power supply relay end is in power failure, the electric quantity stored by the capacitor unit is started to supply power to the MCU micro control unit and the communication unit so as to maintain the detection state of the MCU micro control unit on the power supply line, maintain the communication connection between the communication unit and the remote control server and simultaneously send power failure alarm information to the remote control server.

The beneficial effect of the invention is that,

the power distribution network metering protection system and the power distribution network metering protection method provided by the invention have the advantages that whether electricity stealing behaviors occur or not is identified by monitoring and comparing the output frequency of the power supply relay and the consumption frequency of a terminal user, the fact that electricity is stolen by shunting from the input end of the electric energy meter is prevented from being manually prevented, monitored data are stored in a remote management terminal to be used as evidence, meanwhile, the behaviors of utilizing strong magnets to interfere the electric energy meter for metering are monitored, and illegal behaviors of stealing electricity by utilizing electricity stealing means such as shunting and strong magnet interference are timely discovered and prevented.

In addition, the invention has reliable design principle, simple structure and very wide application prospect.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.

FIG. 2 is a schematic flow diagram of a method of one embodiment of the invention.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1, the present embodiment provides a power distribution network metering protection system, which includes:

the device comprises a voltage monitoring unit 1, an output power monitoring unit 2, a power supply relay 3, an MCU (microprogrammed control unit) micro control unit 4, an alarm module 5, a driving unit 6, a communication unit 7, a remote monitoring server 8, an electric energy meter 9, a magnetic field monitoring unit 10 and a capacitance unit 11.

The input end of the voltage monitoring unit 1 is electrically connected with the output end of the power supply relay 3 and is used for monitoring the output voltage V of the power supply relay 3; the input end of the output power monitoring unit 2 is electrically connected with the output end of the power supply relay 3 and is used for monitoring the output power P1 of the power supply relay 3; the input end of the MCU 4 is electrically connected with the output end of the voltage monitoring unit 1 and the output end of the output power monitoring unit 2, and the output end of the MCU 4 is electrically connected with the input ends of the driving unit 6 and the communication unit 7; the driving unit 6 is used for controlling the power supply state of the power supply relay 3 according to the instruction of the MCU micro control unit 4; the communication unit 7 is used for sending power supply state information and alarm information of the system to the remote control server 8; the remote monitoring server 8 is used for receiving and storing monitoring data and alarm information counted by the MCU 4; the electric energy meter 9 is arranged at the user side and is used for monitoring the power consumption P2 and the power consumption W of the user and transmitting the monitored information of the power consumption P2 and the power consumption W to the MCU 4; the magnetic field monitoring unit 10 is used for monitoring the magnetic field intensity H of the electric energy meter 9 and transmitting the magnetic field intensity H to the MCU 4; and the capacitor unit 11 is electrically connected with the MCU 4 and used for supplying power to the MCU 4 when the power supply line is powered off so as to maintain the communication connection between the MCU and the remote control server 8.

The MCU 4 is an MCS-51 single chip microcomputer with a One-Time programmable ROM (OTPROM), and the single chip microcomputer has a storage function and a program rewriting function, so that an operator is allowed to redesign a monitoring program and a numerical value according to the change of a monitoring condition, and the single chip microcomputer is more applied to large-scale equipment such as power grid facilities at the present stage.

Example 2

Referring to fig. 2, the present embodiment provides a control method of a power distribution network metering protection system, including:

the output voltage V of the power supply relay is monitored through the voltage monitoring unit, the output power P1 of the power supply relay is monitored through the output power monitoring unit, the power consumption power P2 of a user side is monitored through the electric energy meter, and the numerical value detected by each unit is sent to the MCU.

The MCU micro control unit stores the output voltage V connected with the power supply relay, the output power P1 of the power supply relay and the power consumption power P2 monitored by the electric energy meter at intervals of 5 seconds, and calculates the average value of the output voltage V of the power supply relay in the period time by taking 30 minutes as a cycle periodV, P1, P2,And sending the corresponding electric energy meter number to the remote management server synchronously.

MCU little the control unit judges whether power supply relay's output voltage is stable, and when satisfying following condition, MCU little the control unit judges power supply relay's output voltage V is unstable:

when the output voltage V of the power supply relay is in a stable normal state, according to the output power P1 of the power supply relay received by the MCU in real time and the power consumption P2 monitored by the electric energy meter, the following conditions are met, and then the electricity stealing behavior of the circuit where the electric energy meter is located is judged:

(P1-P2)/P1≥20％

considering that power transmission can generate a small amount of loss on a line, the output power P1 of the power supply relay is larger than the power consumption P2 monitored by the electric energy meter in a normal state, but a large difference value cannot be generated, if the difference value is higher than 20%, the situation that partial electric quantity is shunted and consumed before the electric energy meter measures the electric quantity can be completely judged, the MCU micro control unit can judge that shunt electricity stealing behavior occurs on the line and send alarm information to the remote monitoring server, and meanwhile, in order to prevent the electricity stealing behavior from continuing, the MCU micro control unit sends a power supply stopping instruction to the driving unit, so that the power supply relay stops supplying power to the line where the electric energy meter is located.

Meanwhile, in order to prevent the influence on the accuracy of metering caused by the manual magnetic field interference on the electric energy meter, the MCU micro control unit receives the magnetic field intensity H of the electric energy meter monitored by the magnetic field monitoring unit. Under the normal condition, because the electric energy meter has current inside, can produce certain electromagnetic effect through the electric current, so the electric energy meter can have certain magnetic field, and if the artificial strong magnetic field interference to the electric energy meter, the measurement digit of electric energy meter can be poor and the deviation can be produced, even stop the measurement, so through utilizing the monitoring of magnetic field monitoring unit to electric energy meter magnetic field intensity, in case find that magnetic field intensity H is higher than normal numerical range, MCU microcontrol unit can judge that this electric energy meter takes place strong magnetic field interference action, and send alarm information to the remote monitoring server, in order to prevent the measurement loss that leads to by strong magnetic field interference from continuing to take place simultaneously, MCU microcontrol unit sends the instruction of stopping supplying power to the drive unit, so that power supply relay stops supplying power to the circuit that this electric energy meter is located.

The alarm information includes: the identified electricity stealing behavior type, the output voltage V of the power supply relay, the output power P1 of the power supply relay, the power consumption power P2 monitored by the electric energy meter, the magnetic field intensity H of the electric energy meter, the serial number of the electric energy meter and the time;

the types of electricity stealing behavior include: shunting and electricity stealing and strong magnetic field interference.

When the MCU micro control unit judges that the output voltage V of the power supply relay is in an unstable state, the power supply relay is judged to have a power supply fault, and the MCU micro control unit sends alarm information to the remote monitoring server to inform maintenance personnel of maintaining.

When the power supply line of the power supply relay end is in power failure, the electric quantity stored in the capacitor unit is started to supply power to the MCU micro control unit and the communication unit so as to maintain the detection state of the MCU micro control unit on the power supply line and maintain the communication connection between the communication unit and the remote control server, the MCU micro control unit sends warning information to inform the remote control server that the current power supply line is in power failure and keeps monitoring the power supply line in real time, and if the power supply state is recovered, warning cancellation information is sent to the remote control server.

The same and similar parts in the various embodiments in this specification may be referred to each other. Especially, for the terminal embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant points can be referred to the description in the method embodiment.

In the embodiments provided in the present invention, it should be understood that the disclosed system and method can be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, systems or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.