CN205620035U - Temperature measurement alarm system that transformer substation is wireless - Google Patents

Abstract

The utility model relates to a wireless temperature measurement and alarm system for a substation. The system includes at least two temperature measurement communication terminals, more than two wireless temperature measurement sensors matched with each temperature measurement communication terminal, and a management center server; the wireless temperature measurement sensor is connected to the temperature measurement communication terminal through a wireless signal, and the temperature measurement The communication terminal is connected with the management center server. The utility model has the advantages of strong practicability, outstanding practical effect, low cost and the like.

Description

A wireless temperature measurement and alarm system for substations

technical field

The utility model relates to the technical field of operating temperature monitoring of high-voltage equipment in substations, in particular to a wireless temperature measurement and alarm system for substations.

Background technique

At present, the technology used to monitor the operating temperature of high-voltage equipment in substations is mainly infrared temperature measurement and optical fiber monitoring. Infrared temperature measurement is mainly through the connection of high-voltage electrical equipment through infrared imagers. It is difficult for the instrument to image accurately, which greatly interferes with the accuracy of imaging. In addition, because the infrared probe must keep a sufficient safe distance from the object to be measured, and needs to face the surface of the object to be measured, the infrared temperature measurement device will Restricted by the surrounding environment of high-voltage equipment; fiber optic temperature measurement also needs to install the temperature sensor directly at the connection of electrical equipment or in a closed cabinet, the temperature sensor is connected to the fiber optic thermometer with an optical fiber, and then the fiber optic temperature thermometer is used to transmit the temperature through the optical fiber for signal transmission. The toughness and strength of optical fiber are not high, and it is easy to break. It is also greatly affected by the ambient temperature, and the input cost is high.

Utility model content

The purpose of the utility model is to provide a wireless temperature measurement and alarm system for a substation, which has strong practicability, outstanding practical effect and low cost.

The technical scheme of the utility model is:

The utility model relates to a substation wireless temperature measurement and alarm system, which is characterized in that the system includes at least two or more temperature measurement communication terminals, more than two wireless temperature measurement sensors matched with each temperature measurement communication terminal, and a management center server; The wireless temperature measurement sensor is connected to the temperature measurement communication terminal through a wireless signal, and the temperature measurement communication terminal is connected to the management center server;

The temperature measurement communication terminal is composed of single-chip main control circuit, power supply circuit, serial port communication circuit, wireless module, and display module; Module, and connected to the management center server through the wireless module, the other output end of the single-chip microcomputer main control circuit is connected to the input end of the display module, and the first input end of the wireless module receives the signal from the wireless temperature measurement sensor and outputs it to the single-chip microcomputer main control circuit;

The wireless temperature measurement sensor is composed of a power module, a wireless control module, and a temperature acquisition module. The power module supplies power to the wireless control module and the temperature acquisition module respectively. The output end of the control module is connected to the wireless module of the temperature measurement communication terminal.

The temperature measuring unit of the wireless temperature measuring sensor described in the utility model adopts a heat-sensitive element wrapped in a high-temperature ceramic material protective sleeve, and is connected to a wireless temperature measuring terminal device through an anti-magnetic interference shielding wire, and at the same time, the device uses solar energy for power supply and signals collection and delivery;

The power module of the wireless temperature measuring sensor described in the utility model adopts the power module of model BK20-500S24; the wireless control module adopts the single-chip wireless transceiver chip nRF24L01 produced by NORDIC in the ISM frequency band of 2.4GHz~2.5GHz; The acquisition module adopts the model DS18B20.

Described temperature measurement communication terminal, its single-chip microcomputer main control circuit adopts the minimum system that model is STC89C52 to form; Display module adopts LCD1602 liquid crystal display; For other modules, the LCD1602 display module data terminal is connected to the P0 port of the STC89C52 microcontroller, and the RS, RW, and E terminals are respectively connected to the P2.0-P2.2 interface of the microcontroller.

The sending end of this system adopts DS18B20 temperature sensor to collect temperature, and the data is collected and processed by STC89C5C2 and then sent to the receiving end by nRF24L01 module. Including the initial configuration of DS18B20 and nRF24L01 modules.

The receiving end of this system uses the nRF24L01 wireless module to receive the temperature data from the sending end, and displays it on the LCD1602 liquid crystal display through the single-chip microcomputer STC85C522. These include the initialization of the nRF24L01 module and the LCD1602 liquid crystal display.

The digital temperature sensor DS18B20 is smaller in size, wider in applicable voltage and more economical. Digital temperature sensor DS1820 is the world's first temperature sensor that supports "one-line bus" interface. The unique and economical characteristics of the first-line bus enable users to easily build sensor networks and introduce a new concept for the construction of measurement systems. DS18B20 supports "one-line bus" interface, the measurement temperature range is -55°C~+125°C, within the range of -10~+85°C, the accuracy is ±0.5°C. The on-site temperature is directly transmitted in the digital mode of "one-line bus", which greatly improves the anti-interference performance of the system.

nRF24L01 is a new single-chip radio frequency transceiver device, working in the 2.4 GHz to 2.5 GHz ISM frequency band. Built-in frequency synthesizer, power amplifier, crystal oscillator, modulator and other functional modules, combined with enhanced ShockBurst technology, the output power and communication channel can be configured through the program. nRF24L01 has low power consumption. When transmitting at -6 dBm, the operating current is only 9 mA; when receiving, the operating current is only 12.3 mA. Multiple low-power operating modes (power-down mode and idle mode) make energy-saving design more convenient.

The utility model is installed at the connecting terminal of the capacitor bank.

Its working process is as follows: the wireless temperature measurement sensor will monitor the temperature through the temperature sensor at the terminal of the capacitor bank and the connection signal line, convert the signal through the circuit, convert the temperature signal into a wireless signal and send it out to the temperature measurement communication terminal ;The temperature measurement communication terminal periodically collects the wireless signal sent by the wireless temperature measurement sensor, restores the wireless signal to a digital temperature signal through the data conversion circuit, and sends the data to the data management center server through the 485 output port; the data management center server , through a professional database form, the temperature signals of each substation are collected and stored in a centralized manner, and the temperature signals of all stations must be centralized to the data management center server for management and configuration. The server of the data management center displays and stores the data of each monitoring point in real time. If there is a temperature rise alarm, even if there is no one on duty, the alarm information can be sent to the mobile phone of the management personnel through the GPRS SMS alarm host in time, and the temperature change can be grasped at the first time. Condition. The management workstation adopts the form of network, and installs corresponding software programs in the computers of relevant management personnel in the unified network. According to the different responsibilities of each department, it can manage the information of all substations within the scope, through graphics, lists, historical curves, real-time curves, Alarm and other forms to monitor.

When the system is running normally, the on-duty personnel can visually monitor the operation of each monitoring point of the capacitor bank through the client, and send the operation information such as the temperature of each connection of each capacitor bank in the substation and the operation of the wireless temperature sensor to the background of the substation Computer or remote monitoring center system, the real-time data and historical records of each monitoring point can be retrieved at any time from the background computer or monitoring center of the substation. When the system is running abnormally, through the automatic comparison of real-time data and historical curves, the alarm function of the wireless temperature measurement sensor can be adjusted wirelessly in the station, and the point can be found in time.

The wireless temperature measuring sensor is installed at the terminal of the capacitor bank. The wireless temperature measuring sensor sends the temperature data to the temperature display device according to the set cycle. If the temperature of the monitoring point is abnormal, the wireless temperature measuring sensor is not limited by the time limit, and immediately sends the temperature signal and gives an alarm in time. Each monitoring point of the wireless temperature sensor is equipped with a probe, and each probe corresponds to a unique ID number. While the temperature sensor sends the temperature of the monitoring point to the substation background machine or monitoring center, it also transmits the ID number of the probe. The memory storage unit corresponds to the probe and sensor ID stored in advance with the installed monitoring points, and automatically determines the temperature of each monitoring point. Each temperature measurement terminal manages 100 wireless temperature measurement sensors, and the ID numbers of these sensors need to be configured and saved in the flash of the terminal in advance.

The wireless temperature measurement sensor will automatically send the temperature data of the monitoring points according to the cycle (set before the equipment is running), and the background machine of the substation will receive and automatically store the temperature data of each monitoring point, and compare the real-time data with the historical data and change curve of the system. Analyze, set the temperature alarm limit, and immediately alarm when the limit is exceeded, and can also be connected to the network for WEB release. Compared with the previous temperature measurement method, it avoids the phenomenon of false report, false report and delayed report, and judges the overheating time of the connection point of electrical equipment and the damage degree of the equipment through alarm and data query. At the same time, the temperature alarm of the device can be sent on the mobile phone, and the on-site check can be carried out quickly, and the defect of the device can be dealt with in time, so as to prolong the service life of the device and improve the stability of the system operation.

The beneficial effects of the utility model are:

The beneficial effects of the utility model are: the utility model has strong practicability and outstanding effect. Monitoring to ensure that the temperature of the terminals of the capacitor bank is within the limitable range, ensuring the safe and stable operation of the equipment. Compared with the situation where the device is not installed, the application of the device can improve the timeliness and reliability of the temperature alarm. It can effectively and accurately monitor the heating terminals of capacitors, shorten the time for fault finding, and improve the efficiency of equipment defect handling. According to the profit of 100,000 yuan per hour for power failure of capacitor banks, power failure The time was shortened from the original average of 6 hours to 1 hour, and the benefit loss of defect handling was reduced by 500,000 yuan. It can be seen that the power grid benefits are obvious. (2) In addition, after installing the device, it can effectively prevent the tripping event of the power grid equipment caused by the fuse terminal of the capacitor bank due to heat, ensure the safe and stable operation of the equipment, and improve the reliability of the power grid operation.

The device of the utility model adopts sensing technology and wireless communication technology to convert and transmit the temperature of high-voltage electrical equipment. Real-time monitoring, not restricted by the environment of the monitored equipment, transmitted through wireless signals, safe and insulated, and low in cost.

Description of drawings

Fig. 1 is the principle block diagram of the utility model embodiment;

Fig. 2 is a schematic block diagram of the temperature measurement communication terminal described in the embodiment of the present invention;

Fig. 3 is a schematic block diagram of the wireless temperature measuring sensor described in the embodiment of the present invention;

Fig. 4 is the workflow of the utility model embodiment.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in detail

As shown in accompanying drawings 1, 2, and 3, a substation wireless temperature measurement and alarm system of the present invention includes at least two or more temperature measurement communication terminals, two or more wireless temperature measurement sensors matched with each temperature measurement communication terminal, and The management center server; the wireless temperature measurement sensor is connected to the temperature measurement communication terminal through a wireless signal, and the temperature measurement communication terminal is connected to the management center server.

The temperature measurement communication terminal is composed of single-chip main control circuit, power supply circuit, serial port communication circuit, wireless module, and display module; module, and connected to the management center server through the wireless module, and the other output terminal of the single-chip microcomputer main control circuit is connected to the input terminal of the display module;

The wireless temperature measurement sensor is composed of a power module, a wireless control module, and a temperature acquisition module. The power module supplies power to the wireless control module and the temperature acquisition module respectively. The output end of the control module is connected to the input end of the management center server.

The temperature measuring unit of the wireless temperature measuring sensor described in the utility model adopts a heat-sensitive element wrapped in a high-temperature ceramic material protective sleeve, and is connected to a wireless temperature measuring terminal device through an anti-magnetic interference shielding wire, and at the same time, the device uses solar energy for power supply and signals collection and delivery;

The power supply module of the wireless temperature measuring sensor described in the utility model adopts the model: BK20-500S24 power supply module: the solar battery provides +5V high level, the Power interface is connected, and the voltage is reduced to +3.3V level by LM1117, and the module provides high level level. P0.0-P0.7 is connected to digital tube segment selection terminal D0-D7. );

Wireless module control module: The wireless module is controlled by the P2 port, a single-chip wireless transceiver chip nRF24L01 produced by NORDIC that works in the ISM frequency band of 2.4GHz~2.5GHz.

The temperature acquisition module adopts the model DS18B20: the temperature acquisition is connected to the P3.3 port of the single chip microcomputer through the DS18B20 I/O terminal. The minimum system of single-chip microcomputer: X1, X2 are connected to the external oscillation circuit, RESET is connected to the reset circuit, and EA is connected to the terminal;

The temperature measurement communication terminal is composed of a single-chip microcomputer main control circuit, a USB power supply circuit, a serial port communication circuit, a wireless module, and a display module;

The main control circuit of the single-chip microcomputer is composed of the minimum system of STC89C52; the display module adopts LCD1602 liquid crystal display; The terminal is connected to the P0 port of the STC89C52 single-chip microcomputer, and the RS, RW, and E terminals are respectively connected to the P2.0-P2.2 interface of the single-chip microcomputer.

The sending end of this system adopts DS18B20 temperature sensor to collect temperature, and the data is collected and processed by STC89C5C2 and then sent to the receiving end by nRF24L01 module. Including the initial configuration of DS18B20 and nRF24L01 modules.

The receiving end of this system uses the nRF24L01 wireless module to receive the temperature data from the sending end, and displays it on the LCD1602 liquid crystal display through the single-chip microcomputer STC85C522. These include the initialization of the nRF24L01 module and the LCD1602 liquid crystal display.

The digital temperature sensor DS18B20 is smaller in size, wider in applicable voltage and more economical. Digital temperature sensor DS1820 is the world's first temperature sensor that supports "one-line bus" interface. The unique and economical characteristics of the first-line bus enable users to easily build sensor networks and introduce a new concept for the construction of measurement systems. DS18B20 supports "one-line bus" interface, the measurement temperature range is -55°C~+125°C, within the range of -10~+85°C, the accuracy is ±0.5°C. The on-site temperature is directly transmitted in the digital mode of "one-line bus", which greatly improves the anti-interference performance of the system.

nRF24L01 is a new single-chip radio frequency transceiver device, working in the 2.4 GHz to 2.5 GHz ISM frequency band. Built-in frequency synthesizer, power amplifier, crystal oscillator, modulator and other functional modules, combined with enhanced ShockBurst technology, the output power and communication channel can be configured through the program. nRF24L01 has low power consumption. When transmitting at -6 dBm, the operating current is only 9 mA; when receiving, the operating current is only 12.3 mA. Multiple low-power operating modes (power-down mode and idle mode) make energy-saving design more convenient.

As shown in accompanying drawing 4, the working process of the utility model is as follows: the wireless temperature measuring sensor will monitor the temperature through the temperature probe at the terminal of the capacitor bank and the connection signal line, convert the signal through the circuit, and convert the temperature signal into a wireless signal And send it out to the temperature measurement communication terminal; the temperature measurement communication terminal periodically collects the wireless signal sent by the wireless temperature measurement sensor, restores the wireless signal to a digital temperature signal through the data conversion circuit, and sends the data to the data through the 485 output port On the management center server; the data management center server centrally collects and stores the temperature signals of each substation through a professional database form, and the temperature signals of all stations must be centralized to the data management center server for management and configuration. The server of the data management center displays and stores the data of each monitoring point in real time. If there is a temperature rise alarm, even if there is no one on duty, the alarm information can be sent to the mobile phone of the management personnel through the GPRS SMS alarm host in time, and the temperature change can be grasped at the first time. Condition. The management workstation adopts the form of network, and installs corresponding software programs in the computers of relevant management personnel in the unified network. According to the different responsibilities of each department, it can manage the information of all substations within the scope, through graphics, lists, historical curves, real-time curves, Alarm and other forms to monitor.

When the system is running normally, the on-duty personnel can visually monitor the operation of each monitoring point of the capacitor bank through the client, and send the operation information such as the temperature of each connection of each capacitor bank in the substation and the operation of the wireless temperature sensor to the background of the substation Computer or remote monitoring center system, the real-time data and historical records of each monitoring point can be retrieved at any time from the background computer or monitoring center of the substation. When the system is running abnormally, through the automatic comparison of real-time data and historical curves, the alarm function of the wireless temperature measurement sensor can be adjusted wirelessly in the station, and the point can be found in time.

The wireless temperature measurement sensor is mainly composed of three units, namely the temperature measurement unit, the wireless transmission unit and the control unit, which are installed at the terminals of the capacitor bank. The wireless temperature measuring sensor sends the temperature data to the temperature display device according to the set cycle. If the temperature of the monitoring point is abnormal, the wireless temperature measuring sensor is not limited by the time limit, and immediately sends the temperature signal and gives an alarm in time. Each monitoring point of the wireless temperature sensor is equipped with a probe, and each probe corresponds to a unique ID number. While the temperature sensor sends the temperature of the monitoring point to the substation background machine or monitoring center, it also transmits the ID number of the probe. The memory storage unit corresponds to the probe and sensor ID stored in advance with the installed monitoring points, and automatically determines the temperature of each monitoring point. Each temperature measurement terminal manages 100 wireless temperature measurement sensors, and the ID numbers of these sensors need to be configured and saved in the flash of the terminal in advance.

The wireless temperature measurement sensor will automatically send the temperature data of the monitoring points according to the cycle (set before the equipment is running), and the background machine of the substation will receive and automatically store the temperature data of each monitoring point, and compare the real-time data with the historical data and change curve of the system. Analyze, set the temperature alarm limit, and immediately alarm when the limit is exceeded, and can also be connected to the network for WEB release. Compared with the previous temperature measurement method, it avoids the phenomenon of false report, false report and delayed report, and judges the overheating time of the connection point of electrical equipment and the damage degree of the equipment through alarm and data query. At the same time, the temperature alarm of the device can be sent on the mobile phone, and the on-site check can be carried out quickly, and the defect of the device can be dealt with in time, so as to prolong the service life of the device and improve the stability of the system operation.

Claims (3)

1. transformer station's wireless temperature measurement alarm system, it is characterised in that: this system includes more than at least two thermometric communications eventually End, and each thermometric communication terminal coupling two or more wireless temperature-measuring sensor and management center server；Wireless temperature measurement Sensor is connected with thermometric communication terminal by wireless signal, and thermometric communication terminal is connected with management center server；

Thermometric communication terminal is made up of single-chip microcomputer governor circuit, power circuit, serial communication circuit, wireless module, display module； Power circuit connects each module respectively provides power supply output to each module, and the outfan of single-chip microcomputer governor circuit passes through serial communication Circuit connects wireless module, and is connected to management center server by wireless module, another output of single-chip microcomputer governor circuit End is connected to the input of display module, and the signal that wireless module one input receives from wireless temperature-measuring sensor exports list Sheet machine governor circuit；

Wireless temperature-measuring sensor is made up of power module, wireless control module, temperature collect module, and power module is given wireless respectively Control module and temperature collect module are powered, and the outfan of the temperature sensing probe of temperature collect module is connected to wireless controlled molding The input of block, the outfan of wireless control module is connected on the wireless module of thermometric communication terminal.

A kind of transformer station the most according to claim 1 wireless temperature measurement alarm system, it is characterised in that: described wireless temperature measurement passes The temperature acquisition mould of sensor is provided with high-temperature ceramics material protection set and is wrapped in outside temperature-sensitive element, is entered by the shielding line of anti-magnetic disturbance Row is connected in wireless temperature-measuring terminal device, and this device is equipped with solar power supply apparatus simultaneously.

A kind of transformer station the most according to claim 1 wireless temperature measurement alarm system, it is characterised in that:

(1), described wireless temperature-measuring sensor, its power module use model BK20-500S24；Temperature collect module uses model For DS18B20；

(2) described thermometric communication terminal, wherein single-chip microcomputer governor circuit uses the minimum system that model is STC89C52 to be formed； Display module uses model to be the liquid crystal display of LCD1602；Power circuit uses model to be MKS-0502000US；Wireless mould Block uses model to be nRF24L01.