CN203423539U - Low-voltage power grid load and leak current integrated monitoring device - Google Patents

Abstract

The utility model discloses a low-voltage power grid load and leak current integrated monitoring device, comprising intelligent circuit breakers and monitoring terminals. Each of the monitoring terminals comprises a first controller and a first power supply, wherein the first controller is in signal connection with the corresponding intelligent circuit breaker and a first wireless communication module. The integrated monitoring device further comprises a data concentrator and a monitoring center. The data concentrator comprises a second controller and a second power supply. The second controller is in signal connection with a first GPRS interface and a second wireless communication module that cooperates with the first wireless communication modules. The monitoring center is provided with a second GPRS interface that cooperates with the first GPRS interface. The integrated monitoring device is advantaged in that the data concentrator collects data and then forwards the data to the monitoring center uniformly so that the GPRS transmission frequency is low and the cost is reduced; and the wireless collection of the data of the monitoring terminals by the data concentrator is benefited, the arrangement places of the monitoring terminals are subjected to little influence, and the arrangement of the monitoring terminals is facilitated.

Description

A low-voltage power grid load and leakage current comprehensive monitoring device

technical field

The utility model relates to the field of electric power system distribution network, in particular to a low-voltage power network load and leakage current comprehensive monitoring device.

Background technique

For a long time, the load and leakage current of the power supply terminal and branch (trunk) lines of the low-voltage power grid have been unable to be remotely monitored and controlled. After the 0.4kV low-voltage line is overloaded or the leakage current exceeds the set value, after the air switch trips, the cause and time of the trip cannot be automatically recorded and reported, making it difficult to analyze and solve the cause of the fault; and it is impossible to perform remote operation of the air switch quickly. Fault isolation and power restoration. At present, the ideal method is to install a leakage current action protector (referred to as "leakage protection") on the side of the low-voltage power grid. The installation mode is divided into general protection, branch leakage protection, and terminal leakage protection.

However, long-term practice has proved that the existing installation mode cannot allow the leak protection to be put into normal use. The reasons are as follows: (1) Safety awareness is not in place. Electricity customers, especially rural customers, know little about the role of leakage protection, and the mentality of using electricity with less investment affects their use of leakage protection; (2) ) The management of power consumption cannot keep up, and the terminal leakage protection is installed on the terminal. If a customer does not install the leakage protection and causes the branch leakage protection or the main protection to trip, it is difficult to troubleshoot the specific leakage occurrence, resulting in a heavy workload for emergency repairs. At the same time, it is difficult to monitor and manage the low-voltage power grid load and leakage current remotely and intuitively through the installation of leakage protection, and it is difficult to improve the automation level of operation and management of low-voltage power grid load and leakage current.

Utility model content

The utility model provides a low-voltage power grid load and leakage current comprehensive monitoring device, which overcomes the disadvantages of the background art that the leakage protection of the low-voltage power grid is difficult to manage and the automation level is not high.

The technical solution adopted by the utility model to solve its technical problems is:

A low-voltage power grid load and leakage current comprehensive monitoring device, comprising an intelligent circuit breaker (1) and a monitoring terminal (2), the monitoring terminal (2) at least including a first controller (21) and a first power supply (22), the The signal of the first controller (21) is connected to the intelligent circuit breaker (1), and the first power supply (22) is electrically connected to the first controller (21); the comprehensive monitoring device also includes a data concentrator (3) and a monitoring center (4 ); the first controller (21) is connected to the first wireless communication module (24); the data concentrator (3) at least includes a second controller (31) and a second power supply (34), the second power supply (34) Electrically connected to the second controller (31); the second controller (31) is connected to the first GPRS interface (33) and the second wireless communication module (32); the second wireless communication module (32) Cooperate with the first wireless communication module (24); the monitoring center (4) is provided with a second GPRS interface, and the second GPRS interface cooperates with the first GPRS interface (33).

In a preferred embodiment: the first wireless communication module (24) and the second wireless communication module (32) are all ZigBee RF modules, and the data concentrator (3) and the monitoring terminal (2) can be connected by ZigBee communication .

In a preferred embodiment: the first controller (21) is also signal-connected with a nixie tube display module (25).

In a preferred embodiment: the first power supply (22) provides electric energy for the first controller (21), the first wireless communication module (24) and the nixie tube display module (25);

The second power supply (34) provides electric energy for the second controller (31), the first GPRS interface (33) and the second wireless communication module (32).

In a preferred embodiment: a relay module (5) is also included, and the relay module (5) is signal-connected to the monitoring terminal (2).

In a preferred embodiment: the data concentrator (3) further includes a memory, and the second controller (31) is signal-connected to the memory.

In a preferred embodiment: data communication is performed between the first controller (21) and the intelligent circuit breaker (1) through an RS-485 serial port.

Compared with the background technology, this technical solution has the following advantages:

The monitoring terminal obtains the data of the intelligent circuit breaker (such as load, leakage current, and the reason for recording the fault trip, etc.), the data concentrator first collects the data of the monitoring terminal through wireless communication, and then sends the data to the monitoring center through GPRS according to the instruction, or, the data The concentrator forwards the command sent by the monitoring center to the monitoring terminal, and uses wireless communication technology and GPRS communication means to monitor and manage the low-voltage power grid, so it overcomes the shortcomings of the background technology and can produce the following technical effects: a. The device is collected first and then forwarded to the monitoring center, the number of GPRS transmissions is small, and the cost is reduced; b. It is convenient for the data concentrator to collect monitoring terminal data wirelessly, and the location of the monitoring terminal is less affected, and it is convenient to arrange the monitoring terminal; c. Leakage current can be used to locate, help staff to troubleshoot, avoid multi-user terminal power outage accidents, reduce workload, and improve work efficiency; d. It has the function of collecting data, providing data for many distribution network management, and improving the level of automation. It reduces potential safety hazards and ensures the safe and stable operation of the distribution network; e, renting the GPRS communication network, the scheme is easy to implement, high in transmission reliability, and stable in communication; f, the development of the device has strong practical significance and practical value.

The data concentrator also includes a memory, which can store data and send the data to the monitoring center after unification.

The wireless communication between the data concentrator and the monitoring terminal is a ZigBee wireless network, which is free, does not require wiring, and simplifies the network structure and has high implementation feasibility.

The relay module signal is connected to the monitoring terminal, and is used to transmit data when there is occlusion and the signal is weak.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

FIG. 1 shows a block diagram of the overall structure of a low-voltage power grid load and leakage current comprehensive monitoring device of the present invention.

Fig. 2 depicts a structural block diagram of the data concentrator of the present invention.

FIG. 3 shows a structural block diagram of the monitoring terminal of the present invention.

Detailed ways

Please refer to FIG. 1 to FIG. 3 , a low-voltage grid load and leakage current comprehensive monitoring device, including an intelligent circuit breaker 1 , a monitoring terminal 2 , a relay module 5 , a data concentrator 3 and a monitoring center 4 . The data communication between the intelligent circuit breaker 1 and the monitoring terminal 2 is carried out through the RS-485 serial port; the data communication between the monitoring terminal 2 and the data concentrator 3 is carried out through the ZigBee network; the data communication between the data concentrator 3 and the monitoring center 4 is carried out through the GPRS network Communication; the relay module 5 is used for data transmission for the monitoring terminal 2 and the data concentrator 3 in the case of occlusion and weak signal. The system modules in the monitoring center 4 can remotely monitor the temperature and humidity environment of the ring network cabinet online.

Described intelligent circuit breaker 1 has following function: 1, can collect line information in real time, record line failure cause, information and time; 2, circuit breaker parameter can be set, and can work under automatic and manual control mode, wherein: a, In the automatic control mode, when the leakage current, voltage, and current exceed the limit, the circuit breaker can automatically trip; b. In the manual control mode, the overvoltage protection, overcurrent protection, and leakage protection functions of the intelligent circuit breaker 1 exit, and leakage current, An alarm message is issued when the voltage and current exceed the limit. The intelligent circuit breaker of this embodiment is an existing circuit breaker, for example, a leakage protection with an intelligent interface is installed, such as a residual current circuit breaker of the model SZM1L-S/F2-100A produced by Shandong Zhuoer Electric Co., Ltd.

The monitoring terminal 2 includes a first controller 21, a first power supply 22, an RS-485 communication module 23, a first ZigBee RF module 24, and a nixie tube display module 25. This first controller 21 signal connection RS-485 communication module 23, the first ZigBee RF module 24, nixie tube display module 25. Described first power supply 22 provides electric energy for the first controller 21, RS-485 communication module 23, the first ZigBee RF module 24, nixie tube display module 25, among the present embodiment, the input of the first power supply is 220V AC power supply , the output is respectively +12V, +3.3V, 220V AC power supply, wherein: +3.3V is supplied to the first controller 21, the first ZigBee RF module 24, the RS-485 communication module 23, and the nixie tube display module 25; +12V And 220V AC current source for extended backup power. Described first controller 21 adopts the PIC24FJ64G004 microprocessor of MICROCHIP Company, and this processor has 16 CUPs, 44 pins, the program memory of 64kB, the data memory of 8kB, 2 UART interfaces, allow on-line to flash program memory Erase and write. The controller is connected to the RS-485 communication module 23 through the UART interface, and the RS-485 communication module 23 is connected to the RS-485 communication module of the smart circuit breaker 1 for data transmission between the monitoring terminal and the smart circuit breaker. The nixie tube display module 25 is used to display the current opening and closing state of the circuit breaker, indicate alarm information, and serve as an indicator light for RS-485 communication and power supply. The nixie tube display module 25 is connected to the I/O port of the first controller 21 .

Described data concentrator 3 comprises the second controller 31, the second ZigBee RF module 32, the first GPRS interface 33, the second power supply 34 and memory, and this second controller 31 signal connects the second ZigBee RF module 32, GPRS interface 33 and memory, this second power supply 34 provides electric energy for the second controller 31, the second ZigBee RF module 32, GPRS interface 33 and memory. The second controller 31 also adopts PIC24FJ64G004 microprocessor of MICROCHIP Company.

The first ZigBee RF module 24 is matched with the second ZigBee RF module 32, the ZigBee protocol based on the IEEE802.15.4 standard is adopted between the monitoring terminal 2 and the data concentrator 3, the grid structure adopts the Mesh architecture, and the ZigBee The communication adopts 2.4GHz channel; the Mesh network is composed of Coordinator, Router and End Device. The second ZigBee RF module adopts the XBEE module of Dijin Company of the United States, the working frequency is 2.4GHz, and the indoor transmission distance can reach 100 meters. It integrates the ZigBee2006 protocol stack, works in "AT mode", and can carry out transparent transmission with the controller. It is connected with the controller through the UART interface.

Described monitoring center 4 comprises CPU, memory and the second GPRS interface, and the CPU of described monitoring center 4 adopts the Atom D525 1.8GHz processor of Intel Corporation for example, and CPU signal connects memory and the second GPRS interface, and the second GPRS interface Receive the data and save it in the memory. According to the needs, a system module for remote monitoring and management can also be provided at the CPU of the monitoring center 4, which can be used to analyze the information and display it on the graphical interface, and can generate reports for the environmental information; The command is sent to the data concentrator 3 through the GPRS network, and then forwarded to the corresponding monitoring terminal 2 by the data concentrator 3, such as setting parameters. The monitoring center realizes the remote management and control of the intelligent circuit breaker by processing the collected data information and responding accordingly. Automatically detect and record the overvoltage, overcurrent, and leakage of the line, and give an alarm if any abnormal phenomenon is found, and take corresponding actions to provide an effective analysis basis for the cause of the accident. At the same time, the monitoring center can remotely monitor the temperature and humidity of the ring network cabinet online monitor.

The data concentrator 3 is used to monitor and manage the monitoring terminal 2, store the data of the monitoring terminal 2, store the data of each monitoring terminal, transmit information to the monitoring center 4, set the circuit breaker parameters through the monitoring terminal, and satisfy the requirements of the master station for its monitoring. Operations such as parameter setting, data recall and event reporting, etc. For example: the monitoring terminal 2 can set the parameters of the smart circuit breaker, query the parameters, switch the control mode, monitor the running status and read the electrical parameters of the smart circuit breaker through the data communication of the UART interface. The monitoring terminal 2 wirelessly transmits the line leakage current information to the data concentrator through the ZigBee network at regular intervals. The monitoring terminal 2 communicates with the smart circuit breaker through polling. The monitoring terminal 2 can immediately upload data to the data concentrator when the intelligent circuit breaker trips or the limit alarm emerges.

After the data concentrator 3 summarizes the information of each line and the operating status information of the intelligent circuit breaker, it transmits the information to the monitoring center 4 through the GPRS network. When the monitoring center 4 sends a command, it can be sent to the data concentrator 3 through the GPRS network, and then forwarded to the corresponding monitoring terminal 2 by the data concentrator 3 .

In a preferred embodiment, the intelligent circuit breaker 1 collects the leakage current, voltage and current information of the line in real time. When the intelligent circuit breaker 1 works in the automatic mode, if the current leakage current, voltage and current exceed the limit, the circuit breaker will trip , when it works in manual mode, it only sends out a limit alarm message, and the monitoring center sends an instruction to determine whether to trip. The monitoring terminal 2 collects the electrical quantity of the line and the working status of the circuit breaker 1 every 0.2s through the RS-485 interface, and sends them to the first controller 21 through the serial bus, and the first controller 21 makes corresponding processing through the control strategy, for example: A controller 21 sends the data (packed in a certain format according to requirements) every 5s to the data concentrator 3 through the first ZigBee RF module 24 according to the DL/T645 protocol. After the data concentrator 3 receives the data of the monitoring terminal 2 through the second ZigBee RF module 32, it is stored in its own data memory, if the monitoring center 4 sends an instruction to it and requires the data to be called, the data concentrator 3 will use all the data The data collected and tested (packed according to a certain format, such as "Q/GDW130-2005 Electric Power Load Management System Data Transmission Protocol"), is transmitted to the monitoring center 4 through the GPRS network. After the monitoring center 4 receives the data, it is stored In its own database (according to needs, for example, data analysis and scale conversion can be performed on it and then stored in its own database), and the implementation data will be displayed on the man-machine interface. The staff can view the real-time data and historical data on the monitoring center 4. At the same time, they can also manually modify the operation and parameters of the intelligent circuit breaker 1 remotely, control the opening and closing of the intelligent circuit breaker 1, and check various limit values. to set. At the same time, the network system can also realize the transmission of temperature and humidity data information of the ring network cabinet, and realize the online monitoring of the temperature and humidity environment of the remote ring network cabinet through the monitoring center development platform.

This embodiment can monitor the operation of leakage protection, can automatically collect load data, leakage current and record the cause of fault tripping, and at the same time control the opening and closing of circuit breakers through remote control to realize the isolation of faulty lines and non-faulty lines restoration of power supply. The remote and intuitive monitoring and management of the load and leakage current of the low-voltage power grid will have a beneficial effect on improving the automation level of the operation and management of the load and leakage current of the low-voltage power grid.

After the comprehensive monitoring of low-voltage power grid load and leakage current is implemented, the leakage current can be quickly located, helping the staff to troubleshoot, avoiding multi-user terminal power outage accidents, reducing workload and improving work efficiency. From the perspective of long-term development, the system platform can provide data for many distribution network management functions, play an active role in the future development of distribution network automation, improve the level of automation, reduce potential safety hazards, and ensure the safe and stable operation of the distribution network , the development of the system has strong practical significance and practical value.

The above is only a preferred embodiment of the utility model, so the scope of implementation of the utility model cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the utility model and the contents of the specification should still belong to this utility model. within the scope of utility models.

Claims (7)

1. a low voltage electric network is loaded and leakage current integrated monitoring apparatus, comprise intelligent breaker (1) and monitor terminal (2), this monitor terminal (2) at least comprises the first controller (21) and the first power supply (22), this the first controller (21) signal connects intelligent breaker (1), and this first power supply (22) electricity connects the first controller (21); It is characterized in that: this integrated monitoring apparatus also comprises data concentrator (3) and Surveillance center (4); This first controller (21) signal is connected with the first wireless communication module (24); This data concentrator (3) at least comprises second controller (31) and second source (34), and this second source (34) electricity connects second controller (31); This second controller (31) signal is connected with a GPRS interface (33) and the second wireless communication module (32); This second wireless communication module (32) and the first wireless communication module (24) coordinate; This Surveillance center (4) establishes the 2nd GPRS interface, and the 2nd GPRS interface and a GPRS interface (33) coordinate.

2. a kind of low voltage electric network according to claim 1 is loaded and leakage current integrated monitoring apparatus, it is characterized in that: this first wireless communication module (24) and the second wireless communication module (32) are all ZigBee RF module, between this data concentrator (3) and monitor terminal (2), can communicate to connect by ZigBee.

3. a kind of low voltage electric network load according to claim 1 and leakage current integrated monitoring apparatus, is characterized in that: this first controller (21) is gone back signal and is connected with charactron display module (25).

4. a kind of low voltage electric network according to claim 3 is loaded and leakage current integrated monitoring apparatus, it is characterized in that:

This first power supply (22) is that the first controller (21), the first wireless communication module (24) and charactron display module (25) provide electric energy;

This second source (34) is that second controller (31), a GPRS interface (33) and the second wireless communication module (32) provide electric energy.

5. a kind of low voltage electric network load according to claim 1 and leakage current integrated monitoring apparatus, is characterized in that: also comprise trunk module (5), this trunk module (5) signal connects monitor terminal (2).

6. a kind of low voltage electric network load according to claim 2 and leakage current integrated monitoring apparatus, is characterized in that: this data concentrator (3) also comprises a memory this second controller (31) signal connected storage.

7. according to a kind of low voltage electric network load and leakage current integrated monitoring apparatus described in claim 1 or 2 or 3 or 4 or 5 or 6, it is characterized in that: between this first controller (21) and intelligent breaker (1), by RS-485 serial ports, carry out data communication.

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