CN204694375U - Wireless temperature measuring device for switch cabinet - Google Patents

Abstract

The utility model discloses a kind of wireless temperature measuring device for switch cabinet, comprise the sub-battery of wireless temperature measurement node, concentrator and lithium, between wireless temperature measurement node and concentrator, carry out data transmission by wireless network; Wireless temperature measurement node comprises temperature sensor and wireless sending module; Concentrator comprises metal shell, Centralized Controller, gsm module, bluetooth module and wireless receiving module is provided with in metal shell, wireless sending module in wireless receiving module and wireless temperature measurement node carries out data transmission by wireless network, wireless receiving module is connected with Centralized Controller by serial ports, and Centralized Controller is also connected with gsm module and bluetooth module respectively by serial ports.The utility model has the features such as volume is little, lightweight, super low-power consumption, powered battery, wirelessly transmitting data, the temperature data of temperature measurement node collection can not only be sent in real time to remote server, but also by bluetooth, real time temperature data are sent to the logging of patrol officer.

Description

Switch cabinet wireless temperature measuring device

technical field

The utility model relates to the technical field of electrical equipment, in particular to a temperature measuring device applied to a switch cabinet.

Background technique

Switchgear is one of the important electrical equipment in the power system, usually installed in the substation. During the long-term operation of the equipment, the circuit breaker in the switch cabinet and the connecting plug between the switch cabinet and other parts will cause excessive contact resistance and heat due to poor manufacturing, transportation, installation and aging. If the temperature of these heating parts cannot be monitored, If it is not repaired in time, it will inevitably lead to the occurrence of burnt out of the switchgear.

With the rapid development of the power grid and the increasing requirements for power supply reliability, the traditional periodic maintenance mode can no longer meet the development requirements of the power grid. In order to be able to monitor the temperature of key parts in the switch cabinet in real time, a temperature sensor is usually installed in the switch cabinet, and then the real-time temperature value monitored by the temperature sensor is transmitted to the monitoring terminal in the monitoring room through a cable connection for the operator. Judgment and timely take maintenance measures. However, due to the wired data transmission between the temperature measurement device and the monitoring terminal, problems such as cable aging and breakage are prone to occur over time, which will have a great impact on data collection. If the temperature information cannot be obtained in time, then Accidents such as circuit breaker short circuit between phases and switchgear burning may occur; in addition, the current online temperature measurement devices in switchgear generally use AC 220V AC power supply, and are bulky, heavy and costly.

Contents of the invention

The technical problem to be solved by the utility model is to provide a wireless temperature measuring device for a switchgear with reliable data transmission, small size, light weight, low power consumption and low cost.

In order to solve the problems of the technologies described above, the technical solutions adopted by the utility model are as follows.

Switchgear wireless temperature measurement device, including the wireless temperature measurement node set on the equipment to be tested in the switchgear, the concentrator set on the inner wall of the switchgear cabinet, and the lithium sub-battery that provides working power for the concentrator and the wireless temperature measurement node The wireless temperature measurement node and the concentrator carry out data transmission through a wireless network; the wireless temperature measurement node includes a temperature sensor and a wireless transmission module; the concentrator includes a metal shell, and a centralized controller, a GSM Module, Bluetooth module and wireless receiving module, the wireless receiving module and the wireless sending module in the wireless temperature measurement node perform data transmission through the wireless network, the wireless receiving module is connected to the centralized controller through the serial port, and the centralized controller is also connected to the GSM module through the serial port Connect with bluetooth module.

In the wireless temperature measuring device of the above switch cabinet, the centralized controller is a STM32L151RCT6 single-chip microcomputer.

In the above-mentioned wireless temperature measuring device for the switch cabinet, the single-chip microcomputer is also connected with a real-time clock circuit, a watchdog circuit and an EPROM circuit.

In the above-mentioned wireless temperature measuring device for the switch cabinet, the output end of the lithium sub-battery is also connected with a voltage stabilizing circuit.

In the wireless temperature measuring device of the above switch cabinet, the metal shell of the concentrator is provided with a GSM antenna and a 2.4G antenna.

In the above-mentioned wireless temperature measuring device for the switch cabinet, a SIM card connected to the GSM module is arranged in the metal shell of the concentrator.

Due to the adoption of the above technical solutions, the technical progress achieved by the utility model is as follows.

The utility model has the characteristics of small size, light weight, ultra-low power consumption, battery power supply, wireless data transmission, waterproof, etc. It can not only send the temperature data collected by the temperature measurement node to the remote server in real time, but also send the real-time temperature data to the remote server through Bluetooth. The inspection instrument sent to the inspection personnel adopts the wireless transmission system, so the reliability of data transmission is high; it can be widely used in real-time temperature monitoring of urban ring network switch cabinets.

Description of drawings

Fig. 1 is a structural block diagram of the utility model.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figure 1, a wireless temperature measurement device for a switchgear, including a lithium sub-battery, a concentrator, and several wireless temperature measurement nodes, the wireless temperature measurement node is set on the equipment to be tested in the switchgear, and the concentrator is set on the switchgear cabinet On the inner wall of the battery, the lithium sub-battery provides working power for the concentrator and the wireless temperature measurement node respectively, and data transmission is performed between the wireless temperature measurement node and the concentrator through a 2.4G wireless network.

The wireless temperature measurement node is used to monitor the temperature value of the device under test in real time and transmit it to the concentrator. The wireless temperature node includes a temperature sensor and a wireless sending module; the temperature sensor is used to monitor the temperature value of the device under test in real time, and transmit the monitored data to the concentrator through the wireless sending module.

The concentrator includes a metal shell, and the metal shell is equipped with a centralized controller, a GSM module, a SIM card, a Bluetooth module, and a wireless receiving module. The wireless receiving module and the wireless sending module in the wireless temperature measurement node perform output transmission through the wireless network. The receiving module is connected to the centralized controller through the serial port, and the centralized controller is also connected to the GSM module and the Bluetooth module respectively through the serial port; the SIM card is connected to the GSM module. The metal housing is provided with a GSM antenna and two 2.4G antennas, the GSM antenna is connected to the GSM module, and the 2.4G antenna is respectively connected to the wireless receiving module and the Bluetooth module. In this embodiment, both the wireless sending module and the wireless receiving module use the CC2530 module, and the centralized controller uses the STM32L151RCT6 single-chip microcomputer.

The STM32L151RCT6 microcontroller is the core control element of the concentrator. The PA10 port of the STM32L151RCT6 MCU is connected to the RXD signal terminal of the wireless receiving module, the PA9 port is connected to the TXD signal terminal of the wireless receiving module; the PA3 port is connected to the RXD signal terminal of the GSM module through a 330-ohm current limiting resistor, and the PA2 port is The 330-ohm current-limiting resistor is connected to the TXD signal terminal of the GSM module; the PB10 port is connected to the TXD signal terminal of the Bluetooth module, and the PB11 port is connected to the RXD signal terminal of the Bluetooth module; in this way, the wireless receiving module can be controlled to obtain real-time temperature data and control The GSM module sends the temperature data to the server, and controls the Bluetooth module to send the real-time temperature data to the Bluetooth receiving terminal in the form of Bluetooth.

The 22 and 23 pins of the STM32L151RCT6 MCU are the IO ports for controlling the sleep and power on and off of the GSM module respectively. A low level on the 22 pin makes the GSM module sleep, and a 1-5 second positive signal appears on the 23 pin when the module is powered on. A jump or negative jump pulse turns off the GSM module; a 1-5 second positive or negative jump pulse appears in the shutdown state to start the GSM module. Through these two IO ports, the GSM module can be controlled with low power consumption.

In the utility model, the single-chip microcomputer is also connected with a real-time clock circuit, a watchdog circuit and an EPROM circuit.

The real-time clock circuit provides a clock source for the device to send data cycles to ensure reliable synchronization of data. The real-time clock circuit supplies power to the microcontroller through the lithium-sub-battery when the lithium-sub-battery is working normally. When the lithium-sub-battery is powered off, it supplies power through the backup power button battery to ensure the normal operation of the chip clock. The main chip of the real-time clock circuit uses RX8025T, the 13-pin SDA of the chip RX8025T is the data pin connected to the PB8 port of the STM32L151RCT6 microcontroller, and the 2-pin SCL of the chip RX8025T is the clock pin connected to the PB9 port of the STM32L151RCT6 microcontroller.

The watchdog circuit resets the device to prevent the device from crashing and ensure the stability of the device operation. The main chip of the watchdog circuit adopts TPS3813K33DBVR, the 6-pin RESET of the chip TPS3813K33DBVR is connected to the reset pin RST of the STM32L151RCT6 microcontroller, and the 1-pin WDI of the chip TPS3813K33DBVR is connected to the dog feed signal pin PC5 of the STM32L151RCT6 microcontroller. When feeding the dog signal, the MCU will also be reset.

The EPROM circuit saves the important setting data of the device and the real-time temperature data that fails to be sent, and ensures that the data will not be lost when the device is powered off and powered on again. The main chip of the EPROM circuit adopts AT24C256, and the chip AT24C256 is a 32K byte EPROM chip. Its main function is to save important user data without loss when the system is powered off. The 5-pin SDA of the chip AT24C256 is the data pin I2C1-SDA, which is connected to the PB6 port of the STM32L151RCT6 microcontroller, and the 6-pin SCL of the chip AT24C256 is the clock pin I2C1-SCL, which is connected to the PB7 of the STM32L151RCT6 microcontroller.

The GSM module is used to use the mobile network to send temperature data to a remote server, so that the temperature data of the wireless temperature measurement node can be sent in real time as long as there is a mobile signal. The main chip of the GSM module adopts SIM900A, the 30, 31, 32, 33, and 34 pins of the chip SIM900A are connected to the SIM seat, the 10 pin is the serial data receiving pin RXD0, and the 9 pin is the serial data sending pin TXD0, STM32L151RCT6 The microcontroller can control the GSM module through these two pins. The pin 60 of the chip SIM900A is the interface of the GSM antenna, which is used to connect the GSM antenna on the metal shell. Pin 1 of the chip SIM900A is used to control the switch of the GSM module by the single-chip microcomputer, pin 16 of the chip SIM900A is the reset pin of the module, and pins 55, 56, and 57 of the chip SIM900A are directly connected to the lithium sub-battery to supply power to the GSM module.

The Bluetooth module is used to send the temperature data of the wireless temperature measurement node to the inspection instrument of the inspection personnel, so that the inspection personnel can obtain the temperature data of the equipment in the switch cabinet in real time. The main chip of the Bluetooth module adopts CC2540, and its P0.2 and P0.3 are respectively connected with the PB10 port and PB11 port of the single chip microcomputer to complete the sending of real-time temperature data through the Bluetooth interface. In the utility model, only when the Bluetooth function is turned on and the Bluetooth is successfully paired, the Bluetooth module is awakened, and the Bluetooth automatically enters a dormant state after data transmission is completed to reduce power consumption.

Lithium sub-batteries are used as the power supply. In this embodiment, there are six lithium sub-batteries in total. The six lithium sub-batteries are connected in parallel to form a lithium sub-battery pack, which provides stable power to the single-chip microcomputer and peripherals after being stabilized by a voltage stabilizing circuit.

Claims (6)

1. wireless temperature measuring device for switch cabinet, it is characterized in that: comprise and be arranged on wireless temperature measurement node in switch cubicle on Devices to test, be arranged on concentrator on switch cabinet body inwall and provide the lithium of working power sub-battery for concentrator and wireless temperature measurement node, between wireless temperature measurement node and concentrator, carry out data transmission by wireless network; Described wireless temperature measurement node comprises temperature sensor and wireless sending module; Described concentrator comprises metal shell, Centralized Controller, gsm module, bluetooth module and wireless receiving module is provided with in metal shell, wireless sending module in wireless receiving module and wireless temperature measurement node carries out data transmission by wireless network, wireless receiving module is connected with Centralized Controller by serial ports, and Centralized Controller is also connected with gsm module and bluetooth module respectively by serial ports.

2. wireless temperature measuring device for switch cabinet according to claim 1, is characterized in that: described Centralized Controller is STM32L151RCT6 single-chip microcomputer.

3. wireless temperature measuring device for switch cabinet according to claim 2, is characterized in that: described single-chip microcomputer is also connected with real time clock circuit, watchdog circuit and EPROM circuit.

4. wireless temperature measuring device for switch cabinet according to claim 1, is characterized in that: the output terminal of the sub-battery of described lithium is also connected with mu balanced circuit.

5. wireless temperature measuring device for switch cabinet according to claim 1, is characterized in that: the metal shell of described concentrator is provided with GSM antenna and 2.4G antenna.

6. wireless temperature measuring device for switch cabinet according to claim 1, is characterized in that: be provided with the SIM card be connected with gsm module in the metal shell of described concentrator.