Ring main unit elbow type cable head on-line temperature measurement system based on ZigBee wireless communication technology

Abstract

The invention provides a ring main unit elbow type cable head on-line temperature measurement system based on a ZigBee wireless communication technology. The ring main unit elbow type cable head on-line temperature measurement system comprises a wireless temperature measurement sensor; the wireless temperature measurement collector is connected with the wireless sensor, and the wireless temperature measurement collector is connected with the wireless temperature measurement sensor in a ZigBee wireless communication mode; the on-line monitoring master station management platform is connected with the wireless temperature measurement collector, and the on-line monitoring master station management platform is connected with the wireless temperature measurement collector in a 4G wireless transmission mode, an RS485 communication mode or an RS232 communication mode. The problem that the temperature cannot be monitored due to the fact that the elbow-type cable head of the ring main unit is sealed by the cabinet body is effectively solved, a manual infrared detection method can be gradually replaced, and labor consumption of a maintenance team is effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of ZigBee wireless communication, and in particular to an online temperature measurement system for elbow-type cable heads of ring network cabinets based on ZigBee wireless communication technology. Background Art

[0002] The cable joints in the switchgear and ring network cabinets in the distribution network are usually sealed by the cabinet body, and the temperature detection of the cables in the cabinet is usually completed by the operation and maintenance personnel. There are problems such as large workload, low efficiency, and inability to perform real-time monitoring. Due to the influence of high temperature and load climbing, power cables and heavy-load switch cabinets work in harsh environments such as high voltage and high current for a long time, which can easily cause heat accumulation and increase their internal temperature. At the same time, the cable joints heat up due to aging or excessive contact resistance. The temperature of the heating parts cannot be monitored in real time, which can easily lead to equipment burning, cable breakdown, fire, and even large-scale power outages, causing serious damage to power safety. Among them, joint failure is the main cause of system failure. According to statistics, about 70% of power cable and 40% of high-voltage switch cabinet failures are caused by overheating of equipment.

[0003] Traditional operation and maintenance methods are time-consuming and labor-intensive, and cannot guarantee the economic and safety of distribution network operation. Therefore, relying solely on traditional manual operation and maintenance models is difficult to meet future development needs. Therefore, realizing the state perception of distribution equipment, automatic acquisition of operation data, and reducing operating costs are specific measures to respond to the construction of a highly flexible power grid with diversified integration in Jiangxi Power Grid. Summary of the invention

[0004] In view of this, the main purpose of the present invention is to implant a passive wireless temperature measurement sensor in the cable head of the ring main unit, so as to control the temperature change trend of the ring main unit in real time. This method can provide a decision-making basis for intelligent operation and maintenance and solve the problem of temperature measurement of the cable head of the ring main unit.

[0005] The present invention provides an online temperature measurement system for elbow-type cable heads of ring main unit based on ZigBee wireless communication technology, comprising:

[0006] Wireless temperature sensor;

[0007] A wireless temperature measurement collector connected to the wireless sensor, wherein the wireless temperature measurement collector is connected to the wireless temperature measurement sensor via ZigBee wireless communication; and

[0008] An online monitoring main station management platform connected to the wireless temperature measurement collector, wherein the online monitoring main station management platform is connected to the wireless temperature measurement collector via a 4G wireless transmission method, an RS485 communication method or an RS232 communication method.

[0009] In some embodiments of the present invention, the wireless temperature sensor comprises:

[0010] Electric field power collection unit;

[0011] A data acquisition unit connected to the electric field power collection unit;

[0012] a data processing unit connected to the data acquisition unit; and

[0013] A wireless transceiver unit connected to the data processing unit.

[0014] In some embodiments of the present invention, the wireless temperature measurement collector includes:

[0015] Wireless transceiver unit;

[0016] A core processing unit connected to the wireless transceiver unit;

[0017] a display unit connected to the core processing unit; and

[0018] A communication unit connected to the display unit.

[0019] In some embodiments of the present invention, the wireless temperature measurement collector further includes a power supply unit, and the power supply unit is respectively connected to the wireless transceiver unit, the core processing unit, the display unit, and the communication unit.

[0020] In some implementations of the present invention, the online monitoring master station management platform includes a GIS geographic information module, and the GIS geographic information module is used to obtain location information of the device.

[0021] The online temperature measurement system for the elbow-type cable head of the ring main unit based on the ZigBee wireless communication technology provided by the present invention can monitor the temperature of the cable joints in the ring main unit in real time online, effectively solving the problem that the elbow-type cable head of the ring main unit is sealed by the cabinet body and the temperature cannot be monitored, and can gradually replace the manual infrared detection method, effectively saving the manpower consumption of the maintenance team. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a composition diagram of an online temperature measurement system for elbow-type cable heads of a ring main unit according to an embodiment of the present invention;

[0023] Figure 2 This is a structural diagram of a passive wireless temperature measurement terminal according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the components of a wireless temperature measurement collector according to an embodiment of the present invention;

[0025] Figure 4 The figure is a schematic diagram of installation when the present invention is applied in practice. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be appreciated that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only portions related to the relevant inventions are shown in the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0027] See also Figure 1 The temperature measurement device consists of a wireless temperature sensor, a wireless temperature collector, and an online monitoring master station management platform. The system integrates a wireless temperature sensor for each phase connector. The sensor terminal transmits data to the wireless temperature collector through ZigBee wireless communication. ZigBee wireless communication technology can be used to simultaneously read temperature data from multiple sensor terminals and display the temperature data on the built-in LCD screen.

[0028] The wireless temperature collector uploads data to the online monitoring master station management platform through 4G wireless transmission and RS485 or RS232 communication, supports standard MODBUS / RTU protocol, and realizes real-time temperature status monitoring of cable connectors.

[0029] The passive wireless temperature measurement terminal is developed for the temperature monitoring of the inner core of the elbow connector of the ring network cabinet cable. It has high temperature measurement accuracy and strong anti-interference ability. It can detect hidden dangers in time and improve the safety of use and reliability of operation of primary equipment.

[0030] The passive wireless temperature measurement terminal is a single node device of the entire temperature measurement system. It adopts vacuum cold injection molding process and uses special AB epoxy resin material, which is not easy to deform at high temperature (180℃). It has a built-in high-precision laminated temperature sensor with a temperature measurement range of -40℃-120℃ and an accuracy of ±0.1℃. The power supply adopts electric field power supply and does not require battery power. It can directly replace the original plug without additional accessories. It has the characteristics of easy installation, strong anti-interference ability, easy debugging, reliable operation, and maintenance-free. The whole machine adopts extremely low power consumption mode, and the collection frequency is 5min / time (default).

[0031] See also Figure 2 The passive wireless temperature measurement terminal includes an electric field power collection unit, a data acquisition unit, a data processing unit, and a wireless transceiver unit.

[0032] The electric field power unit obtains energy from the electric field generated by the voltage, and then obtains the DC voltage required by the whole machine through signal modulation and power management module. The data acquisition unit mainly converts the non-electrical signal of the temperature sensor into an electrical signal, and then undergoes signal modulation and amplification processing. The data processing unit will process the AD signal at high speed according to the data reporting cycle. The core of the data processing unit uses TI's integrated chip CC2530, and the MCU has a built-in standard ZigBee protocol stack. It can encapsulate the temperature data in a standard ZigBee protocol frame and transmit uplink data through the wireless transceiver unit according to the set channel.

[0033] The wireless temperature measurement collector can realize data collection, integration, local display and forwarding of multiple passive wireless temperature measurement terminals.

[0034] See also Figure 3 ,The wireless temperature measurement collector is composed of a power supply unit, a wireless ,transceiver unit, a core processing unit, a display unit and a ,communication unit.

[0035] 1): Power supply unit:

[0036] The power supply unit supports a wide range of DC6-36V input. The DC-DC circuit provides the required stable operating voltage for each load module in the subsequent stage. The unit contains anti-reverse connection and anti-surge suppression protection circuits to ensure stable operation of the equipment under extreme conditions.

[0037] 2): Wireless transceiver unit

[0038] The wireless transceiver unit plays the role of a coordinator in the entire LAN. Like the terminal node, it integrates the standard Zigbee protocol stack. The coordinator is responsible for the establishment of the entire network, transmission channel planning, node PanId allocation, etc. For each passive wireless temperature measurement terminal, its own PanId is unique in the entire LAN, and it is also a means for the concentrator to identify multiple terminals. When the device is initially powered on, the wireless transceiver unit will scan the channel and set a network ID, waiting for the terminal node to join. The node will continuously search for the network coordinator and send an association request command, waiting for the coordinator to process and assign a dedicated personal area network ID, waiting for a reply and completing the networking. The wireless transceiver unit receives and parses the ZigBee protocol frames of multiple nodes in real time, binds and marks the temperature data according to different personal area network IDs, and finally packages and sends it to the core processing unit for comprehensive processing.

[0039] 3): Core processing unit

[0040] The core processing unit is mainly responsible for further integration, logical calculation and forwarding of data from multiple nodes. It is the part that connects multiple discrete units. The main control device is a 32-bit ARM microcontroller.

[0041] 4): Display unit

[0042] The main interface of the display unit can display the number of connected terminals, ambient temperature, and software version number. According to the number of mounts, the display interface can be switched every 5 seconds, or the page can be turned in real time by pressing the up and down buttons. Each temperature data corresponds to the installation information on site.

[0043] 5): Communication unit

[0044] The communication unit is divided into two parts: wired communication and wireless communication. The wired communication part reserves standard RS232 and standard RS485 communication interfaces, which can be connected to the subsequent communication gateway as needed. For wireless communication, the internal integrated 4G communication module is equivalent to integrating the communication gateway inside the collector, which undertakes the task of transferring data from the local area network to the public network.

[0045] The online monitoring master station management platform realizes the functions of real-time display, storage, historical query, centralized management, etc. of temperature data. It contains GIS geographic information module, and users can customize two-dimensional electronic maps or three-dimensional simulation maps to intuitively display the location and operation status of equipment on the map. In addition, the online monitoring master station management platform, as the access platform of the monitoring system and the power intranet, can be directly connected with the municipal and provincial monitoring platforms. It can also be connected and developed as needed to meet the requirements of mobile terminal use.

[0046] See also Figure 4 The system has been rigorously tested and installed and tested in some ring main units in Honggutan District, Nanchang.

[0047] At the elbow cable head in the ring network cabinet, a wireless temperature acquisition sensor with electric field power is installed to collect temperature data of the elbow cable head in real time. According to the ABC three-phase form of the cable, a temperature acquisition sensor is configured for each phase of the cable to collect the temperature of the cable joint of that phase.

[0048] The cable temperature data collected by the temperature sensor is transmitted to the wireless temperature measurement collector through ZigBee wireless communication technology. ZigBee wireless communication technology can be used to read the temperature data of multiple sensor terminals at the same time and display the temperature data on the built-in LCD screen. The wireless temperature measurement collector uploads the data to the online monitoring master station management platform through 4G wireless transmission and RS485 or RS232 communication methods, supports standard MODBUS / RTU protocol, and realizes real-time temperature status monitoring of cable connectors.

[0049] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An online temperature measurement system for elbow-type cable heads of ring main units based on ZigBee wireless communication technology, characterized in that: include: Wireless temperature sensor; A wireless temperature measurement collector connected to the wireless sensor, wherein the wireless temperature measurement collector is connected to the wireless temperature measurement sensor via ZigBee wireless communication; as well as An online monitoring main station management platform connected to the wireless temperature measurement collector, wherein the online monitoring main station management platform is connected to the wireless temperature measurement collector via a 4G wireless transmission method, an RS485 communication method or an RS232 communication method.

2. According to claim 1, the online temperature measurement system for elbow-type cable heads of ring main unit based on ZigBee wireless communication technology is characterized in that: The wireless temperature sensor comprises: Electric field power extraction unit; A data acquisition unit connected to the electric field power collection unit; a data processing unit connected to the data acquisition unit; and A wireless transceiver unit connected to the data processing unit.

3. According to the online temperature measurement system of the elbow type cable head of the ring main unit based on ZigBee wireless communication technology in claim 1, it is characterized by: The wireless temperature measurement collector comprises: Wireless transceiver unit; A core processing unit connected to the wireless transceiver unit; a display unit connected to the core processing unit; and A communication unit connected to the display unit.

4. According to claim 3, the online temperature measurement system for elbow-type cable heads of ring main unit based on ZigBee wireless communication technology is characterized in that: The wireless temperature measurement collector also includes a power supply unit, which is respectively connected to the wireless transceiver unit, the core processing unit, the display unit and the communication unit.

5. According to the online temperature measurement system of the elbow cable head of the ring main unit based on ZigBee wireless communication technology in claim 1, it is characterized by: The online monitoring main station management platform includes a GIS geographic information module, and the GIS geographic information module is used to obtain the location information of the equipment.

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