CN104900041A - Method and system for wireless temperature monitoring of substation equipment - Google Patents

Abstract

The invention relates to wireless monitoring technology, in particular to wireless monitoring of substation equipment temperature, and aims to solve the problem that the existing substation equipment temperature monitoring can only be carried out by manual guarding in a wired manner. The invention provides a method for wirelessly monitoring the temperature of substation equipment. The steps are as follows: firstly, a temperature sensor is installed on the equipment required for temperature monitoring in the substation. Then, the temperature sensor collects the temperature of the corresponding device, and the collected temperature information is processed by the first single-chip processing system and then transmitted by the wireless transmission circuit. Finally, the wireless receiving circuit receives the processed temperature information transmitted by the wireless transmitting circuit, and reprocesses the processed temperature information through the second single-chip processing system and then transmits it to the display module for corresponding display. The invention also provides a wireless temperature monitoring system for substation equipment, which is suitable for temperature monitoring of substation equipment.

Description

Substation equipment temperature wireless monitoring system and its monitoring method

technical field

The invention relates to wireless monitoring technology, in particular to a wireless monitoring system for substation equipment temperature.

Background technique

Important equipment such as high-voltage switchgear, busbar connectors, cable connectors, power transmission and transformation line connectors, and outdoor knife switches in substations are prone to heating due to insulation aging or excessive contact resistance during long-term operation, resulting in fires and large-scale Power outage accidents, resulting in significant economic losses and serious social impact. Therefore, it is very necessary to monitor the temperature of substation equipment in real time.

The temperature detection methods of substation equipment are roughly divided into manual point-by-point measurement, infrared thermal imaging method, wired online detection and wireless automatic detection. At present, domestic small and medium-sized substations generally use infrared thermometers for manual point-by-point temperature measurement, and larger substations where some conditions permit use distributed optical fibers or infrared thermal imaging cameras for temperature measurement. The comprehensive automation level of foreign substations is ahead of my country, and the accuracy and reliability of equipment wired online detection are higher, but it has not yet surpassed the scope of wired temperature measurement. The biggest advantage of wireless temperature measurement is that it does not need to consider the wiring problem, which not only saves money, is simple to install and maintain, reduces the space occupation of the substation, but also avoids the physical injury of the staff in the strong electromagnetic environment of the substation for a long time. Wireless online monitoring can be applied to unattended temperature monitoring of substation comprehensive automation, and its unique advantages indicate its broad development space in the future. In the detection of power equipment, it is necessary to measure the temperature of each component of the power equipment frequently. For these heat-prone parts of the substation equipment, if reliable monitoring methods are not adopted, it is easy to cause the temperature rise to increase, the equipment to overheat and burn the primary equipment, resulting in power supply interruption or malignant Accidents and serious economic losses. Therefore, online temperature monitoring of substation equipment has important practical significance. Substation equipment wireless monitoring technology integrates microelectronics technology, wireless communication technology, sensor technology, battery technology, and electromagnetic compatibility technology. With further breakthroughs in low power consumption and anti-interference technology, the advantages of wireless monitoring technology over traditional substation monitoring modes will become more prominent, and the application of short-distance wireless communication technology in power systems such as substations will continue to be recognized and popularized .

Contents of the invention

The purpose of the present invention is to solve the problem that the temperature monitoring of the existing substation equipment can only be carried out by manual guarding in a wired manner.

In order to achieve the above object, the present invention provides a wireless monitoring method for substation equipment temperature, the steps are as follows:

A. Install temperature sensors on the equipment that needs temperature monitoring in the substation. The equipment that needs temperature monitoring includes high-voltage switch cabinets, bus connectors, cable connectors, power transmission and transformation wire connectors, and outdoor knife switches. Each temperature sensor corresponds to a equipment;

B. The temperature sensor collects the temperature of the corresponding equipment, and the collected temperature information is processed by the first single-chip processing system and then transmitted through the wireless transmission circuit;

C. The wireless receiving circuit receives the processed temperature information transmitted by the wireless transmitting circuit, and transmits the processed temperature information to the display module for corresponding display after being reprocessed by the second single-chip processing system.

Specifically, an upper computer is also provided between the display module and the second single-chip processing system, and the upper computer is used for storing and querying temperature data, and at the same time compares the collected temperature data with the preset safe temperature range. When the collected temperature data is outside the set safe temperature range, an alarm signal is sent.

A preferred scheme is that the first single-chip processing system and the second single-chip processing system adopt MSP430F149 single-chip microcomputer, the temperature sensor is a DS18B20 temperature sensor, the display module is an LCD1602 liquid crystal display, and the wireless transmitting circuit and the wireless receiving circuit The circuit adopts nRF24L01 chip.

Specifically, the temperature detection range of the temperature sensor is -55 degrees to 125 degrees.

Specifically, in step A, after the equipment is installed, the clock of the MSP430F149 microcontroller, the timer of the MSP430F149 microcontroller, the nRF24L01 chip of the wireless transmitting circuit, the nRF24L01 chip of the wireless receiving circuit, and the DS18B20 temperature sensor need to be initialized in sequence.

Specifically, the initialization process of the nRF24L01 chip of the wireless transmitting circuit is as follows:

A. Configure the I/O interface and register address of the nRF24L01 chip;

B. After transmitting data to the nRF24L01 chip, judge whether the nRF24L01 chip is interrupted. If no interrupt is generated, repeat the judgment. If an interrupt occurs, enter step C;

C. Determine whether the interrupt source is a successful transmission interrupt, if so, enter step B, otherwise send error processing information;

The initialization process of the nRF24L01 chip of the wireless receiving circuit is as follows:

A. Configure the I/O interface and register address of the nRF24L01 chip;

B. Judging whether the nRF24L01 chip generates a receiving interrupt, if not, repeat the judgment, if so, enter step C;

C. Receive data from the nRF24L01 chip, and send the received data through the UART/USB port.

Corresponding to the above method, the present invention also provides a temperature wireless monitoring system for substation equipment, including a temperature sensor, the temperature sensor is installed on the substation equipment that needs temperature monitoring, and also includes a first single-chip processing system, a wireless transmission circuit, a wireless receiving The circuit, the second single-chip processing system and the display module, the temperature sensor, the first single-chip processing system, the wireless transmitting circuit, the wireless receiving circuit, the second single-chip processing system and the display module are connected in sequence.

The temperature sensor is used to detect the temperature of its corresponding equipment, and each equipment corresponds to a temperature sensor; the first single-chip processing system is used to process the temperature detected by the temperature sensor and associate it with the equipment;

The wireless transmitting circuit is used for wireless signal transmission, and the wireless receiving circuit is used for wireless signal reception; the second single-chip processing system is used for reverse processing the received data corresponding to the first single-chip processing system; the display module is used for The data processed by the second single-chip processing system is displayed.

Specifically, an upper computer is also provided between the display module and the second single-chip processing system, and the upper computer is used for storing and querying temperature data, and at the same time compares the collected temperature data with the preset safe temperature range. When the collected temperature data is outside the set safe temperature range, an alarm signal is sent. Therefore, the host computer should have an alarm or an alarm connected to the host computer.

Preferably, the first single-chip processing system and the second single-chip processing system adopt MSP430F149 single-chip microcomputer, the temperature sensor is a DS18B20 temperature sensor, the display module is an LCD1602 liquid crystal display, and the wireless transmitting circuit and wireless receiving circuit adopt nRF24L01 chip .

Specifically, the substation equipment requiring temperature monitoring includes high-voltage switch cabinets, bus joints, cable joints, transmission and transformation line joints, and outdoor knife switches.

The beneficial effect of the present invention is: the present invention uses MSP430F149 and nRF24L01 as the main chips to realize the hardware and software design of the temperature data acquisition node and the central node, as well as the monitoring software design of the upper computer. Use the DS18B20 temperature sensor to collect data, MSP430F149 processes the collected temperature, and then sends the temperature data to the receiving end through the wireless sending module Nrf2401. The receiving end also adopts MSP430F149 as the core to ensure the accuracy of the data. The display of data is realized through LCD1602 liquid crystal display, so as to realize the wireless detection of temperature. The temperature data acquisition node is composed of a microprocessor unit, a wireless communication unit, a temperature acquisition unit and a power supply unit; the central node is composed of a microprocessor unit, a wireless communication unit, a serial communication unit, a storage unit and a power supply unit. The temperature data acquisition node starts to collect the temperature of the equipment after it is powered on successfully, and sends the collected temperature data to the central node in a wireless manner. The central node analyzes and processes the collected temperature data of each node, and waits for and responds to the communication commands from the host computer. The monitoring computer software is developed by VisualC++6.0, realizes the management and analysis of the system, and provides functions such as parameter setting, alarm, display, and printing.

The technical solution of the present invention will be further described below in conjunction with the specific implementation of the embodiment. It should be noted that the embodiment is only to help readers better understand the technical concept of the present invention, and is not intended to limit the protection of the claims of the present invention. scope.

Detailed ways

The present invention provides a system for monitoring the temperature of substation equipment in a wireless manner. The system includes a temperature sensor, the temperature sensor is installed on the substation equipment that needs temperature monitoring, and also includes a first single-chip processing system and a wireless transmission circuit. , a wireless receiving circuit, a second single-chip processing system and a display module, the temperature sensor, the first single-chip processing system, a wireless transmitting circuit, a wireless receiving circuit, the second single-chip processing system and a display module are sequentially connected; the temperature sensor is used for Detect the temperature of its corresponding device, each device corresponds to a temperature sensor; the first single-chip processing system is used to process the temperature detected by the temperature sensor, and associate it with the device; the wireless transmitting circuit is used for wireless signal Transmitting, the wireless receiving circuit is used for wireless signal reception; The second single-chip processing system is used for reverse processing the received data corresponding to the first single-chip processing system; the display module is used for processing the second single-chip processing system The data is displayed.

Corresponding to the above system, the present invention also provides a method for wireless temperature monitoring of substation equipment. The steps of the method are as follows: first, a temperature sensor is installed on the equipment requiring temperature monitoring in the substation, and the equipment requiring temperature monitoring includes a high-voltage switch Cabinets, bus joints, cable joints, power transmission line joints and outdoor knife switch, each temperature sensor corresponds to a device. Then, the temperature sensor collects the temperature of the corresponding device, and the collected temperature information is processed by the first single-chip processing system and then transmitted by the wireless transmission circuit. Finally, the wireless receiving circuit receives the processed temperature information transmitted by the wireless transmitting circuit, and transmits the processed temperature information to the display module for corresponding display after being reprocessed by the second single-chip processing system.

Example

The composition and working method of the substation equipment temperature wireless detection system of the present invention will be described in detail below.

The first single-chip processing system and the second single-chip processing system of the present invention adopt MSP430F149 single-chip microcomputer, the temperature sensor is a DS18B20 temperature sensor, the display module is an LCD1602 liquid crystal display, and the wireless transmitting circuit and the wireless receiving circuit adopt nRF24L01 chip. DS18B20 is an improved intelligent temperature sensor newly launched by DALLAS Semiconductor Company of the United States after DS1820. Its appearance is the same as that of ordinary triodes, and it has the characteristics of small size, low hardware overhead, strong anti-interference ability and high precision. Compared with traditional thermistors, it can directly read the measured temperature and realize 9-12 digital value reading mode through simple programming according to actual requirements. DS18B20 adopts a unique single-line interface DQ, and information is sent to or from DS18B20 through the single-line interface DQ, so only one line and ground need to be connected from the central processing unit (CPU) to DS18B20 to communicate. The circuit is simple and requires no external components. Provides 9-bit temperature readings with a measurement range from -55°C to +125°C in increments of 0.5°C. The temperature is converted into data within 1s (typical value), and functions such as automatic alarm can be set. Install temperature sensors on equipment that needs temperature monitoring, such as high-voltage switchgear, bus joints, cable joints, power transmission line joints, and outdoor knife switches. Each temperature sensor corresponds to a piece of equipment.

After the equipment is installed, it is necessary to initialize the clock of the MSP430F149 microcontroller, the timer of the MSP430F149 microcontroller, the nRF24L01 chip of the wireless transmitting circuit, the nRF24L01 chip of the wireless receiving circuit and the DS18B20 temperature sensor. The initialization process of the nRF24L01 chip of the wireless transmitting circuit is as follows:

A. Configure the I/O interface and register address of the nRF24L01 chip;

B. After transmitting data to the nRF24L01 chip, judge whether the nRF24L01 chip is interrupted. If no interrupt is generated, repeat the judgment. If an interrupt occurs, enter step C;

C. Determine whether the interrupt source is a successful transmission interrupt, if so, enter step B, otherwise send error processing information;

The initialization process of the nRF24L01 chip of the wireless receiving circuit is as follows:

A. Configure the I/O interface and register address of the nRF24L01 chip;

B. Judging whether the nRF24L01 chip generates a receiving interrupt, if not, repeat the judgment, if so, enter step C;

C. Receive data from the nRF24L01 chip, and send the received data through the UART/USB port.

The temperature sensor collects the temperature of the corresponding equipment, processes the collected temperature information through the first single-chip processing system, and then transmits it through the wireless transmitting circuit, and the wireless receiving circuit receives the processed temperature information transmitted by the wireless transmitting circuit, and transmits the collected temperature information. The above-mentioned processed temperature information is processed again by the second single-chip microcomputer processing system and then transmitted to the display module for corresponding display. An upper computer is also arranged between the display module and the second single-chip processing system, and the upper computer is used for storing and querying temperature data, and at the same time comparing the collected temperature data with the preset safe temperature range, when the collected When the temperature data is outside the set safe temperature range, an alarm signal will be sent.

Claims (10)

1. The wireless monitoring method for substation equipment temperature, characterized in that the steps are as follows: A. Install temperature sensors on the equipment that needs temperature monitoring in the substation. The equipment that needs temperature monitoring includes high-voltage switch cabinets, bus connectors, cable connectors, power transmission and transformation wire connectors, and outdoor knife switches. Each temperature sensor corresponds to a equipment; B. The temperature sensor collects the temperature of the corresponding equipment, and the collected temperature information is processed by the first single-chip processing system and then transmitted through the wireless transmission circuit; C. The wireless receiving circuit receives the processed temperature information transmitted by the wireless transmitting circuit, and transmits the processed temperature information to the display module for corresponding display after being reprocessed by the second single-chip processing system. 2. the substation equipment temperature wireless monitoring method as claimed in claim 1, is characterized in that, between the display module and the second single-chip processing system, a host computer is also arranged, and the host computer is used for storage and query of temperature data, and simultaneously The collected temperature data is compared with the preset safe temperature range, and when the collected temperature data is outside the set safe temperature range, an alarm signal is sent. 3. The wireless monitoring method for substation equipment temperature as claimed in claim 1 or 2, wherein the first single-chip processing system and the second single-chip processing system adopt MSP430F149 single-chip microcomputer, and the temperature sensor is a DS18B20 temperature sensor. The display module is LCD1602 liquid crystal display, and the wireless transmitting circuit and wireless receiving circuit adopt nRF24L01 chip. 4. The wireless temperature monitoring method for substation equipment according to claim 3, wherein the temperature detection range of the temperature sensor is -55 degrees to 125 degrees. 5. the substation equipment temperature wireless monitoring method as claimed in claim 3, it is characterized in that, in step A, after equipment is installed, need successively to the clock of MSP430F149 single-chip microcomputer, the timer of MSP430F149 single-chip microcomputer, the nRF24L01 chip of wireless transmission circuit, The nRF24L01 chip of the wireless receiving circuit and the DS18B20 temperature sensor are initialized. 6. the substation equipment temperature wireless monitoring method as claimed in claim 5, is characterized in that, the initialization process of the nRF24L01 chip of described wireless transmission circuit is as follows: A. Configure the I/O interface and register address of the nRF24L01 chip; B. After transmitting data to the nRF24L01 chip, judge whether the nRF24L01 chip is interrupted. If no interrupt is generated, repeat the judgment. If an interrupt occurs, enter step C; C. Determine whether the interrupt source is a successful transmission interrupt, if so, enter step B, otherwise send error processing information; The initialization process of the nRF24L01 chip of the wireless receiving circuit is as follows: A. Configure the I/O interface and register address of the nRF24L01 chip; B. Judging whether the nRF24L01 chip generates a receiving interrupt, if not, repeat the judgment, if so, enter step C; C. Receive data from the nRF24L01 chip, and send the received data through the UART/USB port. 7. The temperature wireless monitoring system for substation equipment is characterized in that it includes a temperature sensor, and the temperature sensor is installed on the substation equipment that needs temperature monitoring, and also includes a first single-chip processing system, a wireless transmitting circuit, a wireless receiving circuit, a second Single-chip processing system and display module, the temperature sensor, the first single-chip processing system, wireless transmitting circuit, wireless receiving circuit, the second single-chip processing system and display module are connected in sequence; The temperature sensor is used to detect the temperature of its corresponding equipment, and each equipment corresponds to a temperature sensor; the first The single-chip processing system is used to process the temperature detected by the temperature sensor and associate it with the equipment; The wireless transmitting circuit is used for wireless signal transmission, and the wireless receiving circuit is used for wireless signal reception; the second single-chip processing system is used for reverse processing the received data corresponding to the first single-chip processing system; the display module is used for The data processed by the second single-chip processing system is displayed. 8. The substation equipment temperature wireless monitoring system as claimed in claim 7, wherein a host computer is also arranged between the display module and the second single-chip processing system, and the host computer is used for storage and query of temperature data, and simultaneously The collected temperature data is compared with the preset safe temperature range, and when the collected temperature data is outside the set safe temperature range, an alarm signal is sent. 9. The temperature wireless monitoring system of substation equipment as claimed in claim 7 or 8, wherein said first single-chip processing system and second single-chip processing system adopt MSP430F149 single-chip microcomputer, said temperature sensor is a DS18B20 temperature sensor, said The display module is LCD1602 liquid crystal display, and the wireless transmitting circuit and wireless receiving circuit adopt nRF24L01 chip. 10. The wireless temperature monitoring system for substation equipment according to claim 9, wherein the substation equipment requiring temperature monitoring includes high-voltage switch cabinets, bus joints, cable joints, power transmission line joints and outdoor knife switches.