CN105928628A - Switch cabinet temperature acquiring system based on BLE technology - Google Patents

Abstract

The invention discloses a switch cabinet temperature acquisition system based on BLE technology, including a switch cabinet, a plurality of node units, a centralized unit and a monitoring terminal unit; the node unit includes a temperature measurement module, a node bluetooth module and a node power supply module; The centralized unit includes a centralized Bluetooth module and a centralized power supply module; the monitoring terminal unit includes a host computer and a mobile terminal; the temperature measurement module is located inside the switch cabinet, collects the temperature in the switch cabinet, and transmits it to the centralized unit through the node Bluetooth module. The centralized unit transmits data to the monitoring terminal unit through the centralized bluetooth module. The invention has low cost, low power consumption, simple maintenance in the later stage, and is suitable for popularization and use in a wide range.

Description

A switch cabinet temperature acquisition system based on BLE technology

technical field

The invention relates to the technical field of electrical equipment, in particular to a switch cabinet temperature acquisition system based on BLE technology.

Background technique

High-voltage switchgear has always played an important role in the power transmission and distribution system, including the closing and closing of power lines, the conversion of electric energy, the protection of line faults, and the monitoring of operating power data. Therefore, it has gained more and more attention in the power system. The wider the application.

According to statistics, every year there are many domestic power plants and substation systems that cause huge economic losses due to the failure of high-voltage switchgear. The main reasons for the failure of high-voltage switchgear are aging of switchgear components caused by long-term operation, product quality problems, heat concentration caused by closed operation, full load or even overload operation of switchgear, etc. The most direct reason for the failure of the high-voltage switchgear is that the joints and isolated contacts of the switchgear inside the switchgear are caused by the increase in contact resistance due to unqualified product quality or oxidation, looseness, and excessive load of the contacts. caused by fever. The closed cabinet structure makes it impossible for the heat to dissipate. If it is not treated for a long time, it will eventually cause a fire or even a large-scale power outage. Therefore, the temperature of cable joints and circuit breaker contacts inside the high-voltage switchgear must be monitored by effective means to ensure the safe and stable operation of the switchgear.

At present, the commonly used temperature measurement methods for high-voltage switchgear mainly include: temperature display wax chip discoloration method, infrared handheld device temperature measurement method, optical fiber temperature measurement method. Among them, the temperature-indicating wax disc discoloration method was widely used in early high-voltage switchgear and other electrical products, but with the continuous progress of power systems and modern technology, it has gradually withdrawn from the application market. Currently, only a few occasions are still using this method in the market. method. Infrared handheld device temperature measurement method This temperature measurement method is a non-contact temperature measurement method with high temperature measurement accuracy, but the inspection interval is long, and the change of contact temperature cannot be found in time. At present, suitable products in the market for infrared thermometers in the power industry, such as a set of American FSI infrared imaging test systems, cost as much as more than 100,000 yuan. In addition, the infrared thermometer is easily affected by the environment, and it is inconvenient to measure its temperature value when there are obstacles. Optical fiber temperature measurement has high requirements for accuracy and real-time performance, and has a certain market, but the cost of the temperature measurement system is relatively high, and maintenance is difficult, which is not conducive to wide-scale application. The integration of new high-voltage switchgear is getting higher and higher, and the space It is becoming more and more difficult to arrange the fiber optic temperature measurement system in an increasingly narrow interior. Therefore, it is of great significance to design a device that uses wireless communication technology to collect and monitor the temperature data inside the switch cabinet in real time, which is of great significance for the preventive maintenance of the switch.

Contents of the invention

In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a switch cabinet temperature acquisition system based on BLE technology.

The invention has low power consumption and high reliability, and is suitable for replacing the temperature collection system of the existing high-voltage switchgear.

The present invention adopts following technical scheme:

A switch cabinet temperature acquisition system based on BLE technology, including switch cabinets, multiple node units, centralized units and monitoring terminal units;

The node unit includes a temperature measurement module, a node bluetooth module and a node power supply module;

The centralized unit includes a centralized bluetooth module and a centralized power supply module;

The monitoring terminal unit includes a host computer and a mobile terminal;

The temperature measurement module is located inside the switch cabinet, collects the temperature in the switch cabinet, and transmits the temperature to the centralized unit through the node bluetooth module, and the centralized unit transmits the data to the monitoring terminal unit.

The temperature measurement module includes a temperature sensor DS18B20, and a plurality of temperature sensors are installed at the positions of busbars and cable joints in the switch cabinet.

Both the node power supply module and the centralized power supply module are powered by lithium batteries and button batteries.

Both the node bluetooth module and the centralized bluetooth module use the bluetooth chip CC2540.

The data transmission between the node unit and the centralized unit and between the centralized unit and the monitoring terminal unit is based on the BLE Bluetooth communication protocol.

Beneficial effects of the present invention:

The temperature measurement time of the switch cabinet temperature acquisition system based on BLE technology in the present invention is short, and the temperature data can be transmitted to the remote terminal in real time, which is convenient for monitoring and managing the internal temperature of the switch cabinet. At the same time, patrol personnel can use mobile phones in real time near the centralized unit The terminal collects temperature data, shortening the inspection time. In addition, the invention has high accuracy, low cost and low power consumption, and does not need to replace the power supply for a long time. It is easy to maintain in the later stage and is suitable for wide-scale promotion and use.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is the flow chart that node unit of the present invention establishes connection with centralized unit;

Fig. 3 is a flow chart of the temperature data transmission between the node unit and the centralized unit in the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example

As shown in Figure 1, a switch cabinet temperature acquisition system based on BLE technology, including switch cabinets, multiple node units, centralized units and monitoring terminal units;

Each node unit includes a temperature measurement module, a node Bluetooth module and a node power module. The temperature measurement module is specifically a temperature sensor DS18B20, and its temperature measurement range is -55°C to 125°C, which meets the internal temperature range of the high-voltage switchgear; because of its size It is small and has a variety of packaging forms. It is placed inside the switch cabinet and is mainly installed on the busbar and cable joints. It supports multi-point networking function, that is, multiple temperature sensors DS18B20 can be connected in parallel on the only three lines to realize multi-point temperature measurement. ;The temperature data can be directly measured and transmitted to the centralized unit through the node bluetooth module.

Both the node bluetooth module and the centralized bluetooth module are bluetooth chip CC2540, which is a low-power, low-cost single crystal chip of TI company. The chip integrates an enhanced 8051 microcontroller and low-power bluetooth, with 21 General-purpose input and output digital interfaces, 2 UART interfaces, full-speed USB2.0 interfaces, etc., have a variety of low-power sleep modes, short conversion time between various modes, and extremely low power consumption. The collected temperature data can be It is transmitted through the BLE Bluetooth communication protocol and installed on the shell of the switch cabinet.

The node power supply module and the centralized power supply module adopt two power supply modes, specifically lithium battery power supply and button battery power supply, no wired power supply is required, the lithium battery power can work for several years, and the button battery is used as a backup power supply, one can work For more than one year, the two power supply methods ensure that the entire system does not need to replace the power supply for several years.

The centralized unit is not responsible for the temperature collection task, but responsible for the centralized reception of the data transmitted by multiple node units, and then sends it to the monitoring terminal unit through the serial port, specifically through the BLE protocol, and the mobile terminal and the host computer receive the data at the same time.

The monitoring terminal unit includes a host computer and a mobile terminal, and displays the data of each node sent by the centralized unit on the interface to realize real-time monitoring.

The transmission data of the present invention is based on the BLE protocol,

As shown in Figure 2 and Figure 3, the connection relationship between the node unit and the centralized unit is specifically: the centralized unit first sends out a scan request to scan the node device that is sending the advertisement, if the UUID of the GAP service of the two matches, then it can be establish connection.

After the connection between the centralized unit and the node unit is established, the centralized unit sends the UUID of the above characteristics to the node unit, and the node unit returns the handle of the characteristic value to the centralized unit after receiving the UUID, and the centralized unit then sends the handle of the characteristic value to the power-saving unit. The nodal element finally returns the characteristic value, namely the temperature value.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the embodiment, and any other changes, modifications, substitutions and combinations made without departing from the spirit and principle of the present invention , simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present invention.

Claims (5)

1. a switch cabinet temperature acquisition system based on BLE technology, it is characterised in that include switch cubicle, Multiple node units, centralized unit and monitor terminal unit；

Described node unit includes temperature-measuring module, node bluetooth module and node power module；

Described centralized unit includes concentrating bluetooth module and centrally connected power source module；

Described monitor terminal unit includes host computer and mobile terminal；

Described temperature-measuring module is positioned at inside switch cabinet, gathers switch in-cabinet temperature, by node bluetooth mould Block is transferred to centralized unit, and described centralized unit transfers data to monitor terminal unit.

Switch cabinet temperature acquisition system the most according to claim 1, it is characterised in that described temperature is surveyed Amount module includes temperature sensor DS18B20, bus that multiple temperature sensors are arranged in switch cubicle and electricity Cable joint position.

Switch cabinet temperature acquisition system the most according to claim 1, it is characterised in that described node electricity Source module and centrally connected power source module all use lithium battery and button cell to power.

Switch cabinet temperature acquisition system the most according to claim 1, it is characterised in that described node is blue Tooth module and concentration bluetooth module all use Bluetooth chip CC2540.

Switch cabinet temperature acquisition system the most according to claim 1, it is characterised in that node unit with The data of centralized unit and centralized unit and monitor terminal unit are transmitted based on BLE bluetooth communication agreement.