CN104793070A - Intelligent distribution transformer online monitoring system - Google Patents

Abstract

The invention discloses an intelligent distribution transformer online monitoring system. The intelligent distribution transformer online monitoring system comprises a sensor signal collection system which is connected with a plurality of sensors; every sensor at least comprises a vibration sensor and a temperature sensor which are installed on a main transformer outer container, a pressure sensor which is arranged on a main transformer oil tank and a sound sensor which is arranged close to a distribution transformer; the sensor signal collection system is formed by a main controller which is formed by microprocessors and a peripheral circuit; the main controller collects signals collected by the sensors, converts the signals to be data and transmits the data; the sensor signal collection system adopts STM32F103 microprocessor to serve as a main controller; the main controller is connected with an A8 upper computer which can transmit and receive transmission data through tandem connection port; the A8 upper computer is connected with a liquid crystal displayer through a parallel data interface; the A8 upper computer is respectively connected with a GPRS (General Packet Radio Service) module and a RF module through two serial ports and sends messages to a corresponding terminal which is provided with an SIM card through at least one GPRS module.

Description

A distribution transformer intelligent online monitoring device

technical field

The invention relates to an intelligent online monitoring device for distribution transformers, belonging to the technical field of safety monitoring of power distribution equipment.

Background technique

The safe operation of power distribution lines is the basis for ensuring the safe use of electricity in all walks of life, and the safe operation of power distribution lines depends on the normal operation of power distribution equipment. Due to long-term overload operation of power distribution equipment, such as transformers, once a fault occurs, it is Affect the safe operation of power distribution lines. For this reason, online monitoring of power distribution equipment, especially distribution transformers, will help the power sector to keep abreast of the operation of distribution transformers, and provide reliable information for reducing the incidence of accidents and reducing the time for emergency repairs. protection.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the existing technology, and provide a distribution transformer intelligent online monitoring device with reasonable structure, convenient, reliable and safe use, real-time monitoring and sensitive monitoring, and safe operation of power distribution lines.

The purpose of the present invention is achieved through the following technical solutions, a distribution transformer intelligent online monitoring device, the device includes a sensor signal acquisition system connected with a variety of sensors, the sensors at least include the distribution transformer outer box Vibration sensor, temperature sensor, pressure sensor placed in the oil tank of the distribution transformer, sound sensor placed near the distribution transformer; the sensor signal acquisition system is composed of a main controller composed of a microprocessor and peripheral circuits, the main controller Various signals collected by various sensors are converted into transmission data and uploaded to the A8 host computer for real-time monitoring.

The vibration sensor of the present invention is a CZ891 vibration sensor that can directly convert a vibration signal with a measuring range of 0-10mm/s into a 4-20mA output current signal, and the sensor signal acquisition system converts the vibration current signal through AD sampling. transmit data for vibration;

The temperature sensor is at least one DS18B20 digital temperature sensor that can directly convert the collected temperature signal into a digital signal through AD conversion, and the sensor signal acquisition system directly reads the digital signal of the temperature through an I/O interface and It becomes the transmitted data of temperature;

The pressure sensor is a 20B-10MPIG pressure sensor that can directly convert a pressure signal with a range of 0-10Mpa into a 4-20mA output current signal. The sensor signal acquisition system converts the pressure current signal into a pressure signal through AD sampling. transmit data;

The sound sensor is a WST60M noise sensor that can directly convert the sound signal into a noise digital signal through AD, and the sensor signal acquisition system communicates with the WST60M noise sensor through a serial interface and reads the noise digital signal and transmit data that turns it into noise;

The sensor signal acquisition system uses STM32F103 microprocessor as the main controller, and the main controller is connected to the A8 host computer that can upload and receive various transmission data through a serial interface.

The sensor signal acquisition system of the present invention is also connected with at least one pyro-infrared sensor installed near the distribution transformer and capable of sensing the movement of small animals to control the change of high and low levels. The sensor signal acquisition system collects the pyro-infrared sensor The high and low level signal, and through the change of the high and low level signal, the small animal monitoring transmission data is uploaded and received by the A8 host computer;

There are two temperature sensors, one of which is installed close to the outer box of the distribution transformer to collect the temperature of the outer box of the distribution transformer; the other is installed on the wall bushing of the distribution transformer to collect the temperature of the terminal box.

What the A8 upper computer of the present invention selects is a kind of AM335X microprocessor based on ARMcortex-A8, has the SD card greater than 2G, and it connects the liquid crystal display that can show various data in real time by parallel data interface, through two The serial port is connected with the GPRS module and the RF module respectively, and sends a short message to the corresponding terminal with a SIM card through the at least one GPRS module; the A8 host computer and the sensor signal acquisition system are all installed in a monitoring In the box, the liquid crystal display is arranged on the front of the monitoring box.

The present invention mainly aims at the deficiencies in traditional transformer fault diagnosis, especially the problem of difficult diagnosis of non-thermal faults and thermal faults with inconspicuous early heating, and uses the vibration signal of the transformer itself to judge whether there is a potential fault in the transformer; By installing multiple sets of sensors on the transformer oil tank, the vibration acceleration signals and ambient noise signals of the top, bottom, front, and side of the transformer oil tank can be sampled, and the temperature of the transformer and the harmonic content of the voltage output by the transformer can be monitored at the same time. Real-time online monitoring of internal faults such as winding deformation, looseness, and iron core looseness.

The invention is simple in installation and sensitive in monitoring. Once the transformer is abnormal, the GPRS module in the device will send information such as transformer alarm status, fault type and fault time to the set background system (or mobile phone) in time, so that maintenance personnel can find out and eliminate it in time. Transformer failure hidden danger, improve the power supply quality of the grid.

The invention has the characteristics of reasonable structure and composition, convenient, reliable and safe use, real-time monitoring and sensitive monitoring, and the realization of safe operation of power distribution lines.

Description of drawings

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

Fig. 2 is a functional block diagram of the sensor signal acquisition system of the present invention.

Fig. 3 is a functional block diagram of the A8 upper computer of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings: As shown in Figure 1, a distribution transformer intelligent online monitoring device according to the present invention, the device includes a sensor signal acquisition system 1 connected with various sensors, the described The sensor at least includes at least one vibration sensor 3 installed on the distribution transformer 2, at least one temperature sensor 4, a pressure sensor 5 placed in the fuel tank of the distribution transformer 2, and a sound sensor 6 placed near the distribution transformer 2; the sensor signal acquisition System 1 is composed of a main controller composed of a microprocessor and peripheral circuits. The main controller converts various signals collected by various sensors into transmission data and uploads them to the A8 host computer 7 for real-time monitoring.

As shown in Figure 2, the vibration sensor 3 is a CZ891 vibration sensor that can directly convert a vibration signal with a range of 0-10mm/s into a 4-20mA output current signal, and the sensor signal acquisition system 1 is sampled by AD Change the vibrating current signal into vibrating transmission data;

The temperature sensor 4 is at least one DS18B20 digital temperature sensor that can directly convert the collected temperature signal into a digital signal through AD conversion. The sensor signal acquisition system directly reads the digital signal of the temperature through an I/O interface and Turn it into the transmitted data of temperature;

The pressure sensor 5 is a 20B-10MPIG pressure sensor that can directly convert the pressure signal with a range of 0-10Mpa into a 4-20mA output current signal, and the sensor signal acquisition system 1 converts the pressure current signal into Pressure transmission data;

The sound sensor 6 is a WST60M noise sensor that can directly convert the sound signal into a noise digital signal through AD, and the sensor signal acquisition system 1 communicates with the WST60M noise sensor through a serial interface and reads the noise digital signal. signal and turn it into noise for transmitted data;

The sensor signal acquisition system 1 selects STM32F103 microprocessor as the main controller, and the main controller is connected to the A8 upper computer 7 that can upload and receive various transmission data through a serial interface.

As shown in the figure, the sensor signal acquisition system 1 is also connected with at least one pyro-infrared sensor 8 installed near the distribution transformer 2 and capable of sensing the movement of small animals to control the change of high and low levels. The sensor signal acquisition system 1 Collect the high and low level signals generated by the pyro-infrared sensor 8, and form the small animal monitoring transmission data through the change of the high and low level signals to upload to the receiving A8 host computer 7;

One implementation of the present invention is: the temperature sensor 4 has two paths, one of which is installed close to the outer box of the distribution transformer to collect the temperature of the outer box of the distribution transformer; the other is installed on the wall bushing of the distribution transformer , in order to collect the temperature of the terminal box.

Shown in Fig. 3, what A8 host computer of the present invention selects is a kind of AM335X microprocessor based on ARMcortex-A8, has the SD card greater than 2G, and it connects the liquid crystal that can display various data in real time by parallel data interface The display is respectively connected to the GPRS module and the RF module by two serial ports, and sends a short message to the corresponding terminal with a SIM card by the at least one GPRS module; the A8 host computer and the sensor signal acquisition system are both It is installed in a monitoring box 9, and the liquid crystal display 10 is arranged on the front of the monitoring box 9.

Embodiment: shown in Fig. 1-3, the sensor signal acquisition system of the present invention mainly takes STM32F103 microprocessor as core, and its main frequency is up to 72MHZ, collects the data of vibration, pressure, infrared, temperature, noise sensor in real time, and Upload to the A8 host computer system. The superior performance and rich system resources of STM32 ensure the fast and efficient operation of the entire system, the expansion of various functions and real-time monitoring.

The main function:

1. One-way mechanical vibration monitoring (the vibration sensor is installed on the outer box of the main transformer). Through the CZ891 vibration sensor, the vibration signal with a range of 0-10mm/s is directly converted into a 4-20mA output current signal. The sensor signal acquisition system STM32F103 collects the data through AD sampling and uploads it to the A8 system for real-time monitoring.

2. One way to monitor the temperature of the outer box (0-100 degrees, using a temperature sensor). The DS18B20 digital temperature sensor converts the temperature signal directly into a digital signal through AD conversion. The sensor signal acquisition system STM32F103 only needs to read the temperature information of the outer box through one I/O port and upload it to the A8 system for real-time monitoring.

3. One-way terminal box temperature monitoring (0-100 degrees, using temperature sensor). The DS18B20 digital temperature sensor converts the temperature signal directly into a digital signal through AD conversion. The sensor signal acquisition system STM32F103 only needs to read the temperature information of the box through one I/O port and upload it to the A8 system for real-time monitoring.

4. All the way through the wall bushing temperature detection (0-100 degrees, heat expansion of the wire causes damage to the insulation layer). The DS18B20 digital temperature sensor converts the temperature signal directly into a digital signal through AD conversion. The sensor signal acquisition system STM32F103 only needs to read the temperature information of the wall bushing through one I/O port and upload it to the A8 system for real-time monitoring.

5. Noise monitoring along the way (using sound sensor). The noise signal is converted into a digital signal by AD through the WST60M noise sensor. The sensor signal acquisition system STM32F103 communicates with the WST60M noise sensor through a serial port, reads the noise data, and uploads it to the A8 system for real-time monitoring.

6. One-way fuel tank pressure monitoring (transformer manufacturer is required to provide the installation location of the pressure sensor). The 20B-10MPIG pressure sensor directly converts the pressure signal with a range of 0-10MPa into a 4-20mA output current signal. The sensor signal acquisition system STM32F103 collects the data through AD sampling and uploads it to the A8 system for real-time monitoring.

7. Monitoring of small animals near the main transformer along the way (using pyro-infrared sensors for monitoring). The infrared sensor BK-P02C senses the movement of small animals to control the change of high and low levels. The sensor signal acquisition system STM32F103 judges whether there are small animals by collecting the changes of high and low levels, and uploads the information to the A8 system.

In addition, the sensor acquisition system also reserves 3-way temperature monitoring and 3-way infrared monitoring functions.

A8 system function:

1. When the above monitoring is abnormal (exceeding the set value), send a text message to the power company through GPRS (using SIM card);

2. The above monitoring data can be stored in the SD card, and the staff can unplug the SD card and import the data into the computer for analysis;

3. FIRD inspection two-way identification.

Claims (4)

1. A distribution transformer intelligent online monitoring device, which includes a sensor signal acquisition system connected with multiple sensors, characterized in that: the sensors at least include a vibration sensor and a temperature sensor installed on the distribution transformer outer box, The pressure sensor placed in the fuel tank of the distribution transformer, and the sound sensor placed near the distribution transformer; the sensor signal acquisition system is composed of a main controller composed of a microprocessor and peripheral circuits. This signal is converted into transmission data, which is uploaded to the A8 host computer for real-time monitoring. 2. The distribution transformer intelligent online monitoring device according to claim 1, characterized in that: The vibration sensor is a CZ891 vibration sensor that can directly convert the vibration signal with a range of 0-10mm/s into a 4-20mA output current signal, and the sensor signal acquisition system converts the vibration current signal into vibration through AD sampling the transmission data; The temperature sensor is at least one DS18B20 digital temperature sensor that can directly convert the collected temperature signal into a digital signal through AD conversion, and the sensor signal acquisition system directly reads the digital signal of the temperature through an I/O interface and It becomes the transmitted data of temperature; The pressure sensor is a 20B-10MPIG pressure sensor that can directly convert a pressure signal with a range of 0-10Mpa into a 4-20mA output current signal. The sensor signal acquisition system converts the pressure current signal into a pressure signal through AD sampling. transmit data; The sound sensor is a WST60M noise sensor that can directly convert the sound signal into a noise digital signal through AD, and the sensor signal acquisition system communicates with the WST60M noise sensor through a serial interface and reads the noise digital signal and transmit data that turns it into noise; The sensor signal acquisition system uses STM32F103 microprocessor as the main controller, and the main controller is connected to the A8 host computer that can upload and receive various transmission data through a serial interface. 3. The distribution transformer intelligent on-line monitoring device according to claim 2, characterized in that: the sensor signal acquisition system is also connected with at least one sensor installed near the distribution transformer, which can sense the movement of small animals to control the level change The pyro-infrared sensor, the sensor signal acquisition system collects the high and low level signals generated by the pyro-infrared sensor, and through the change of the high and low level signals constitutes an A8 host computer for uploading and receiving small animal monitoring transmission data; There are two temperature sensors, one of which is installed close to the outer box of the distribution transformer to collect the temperature of the outer box of the distribution transformer; the other is installed on the wall bushing of the distribution transformer to collect the temperature of the terminal box. 4. The distribution transformer intelligent online monitoring device according to claim 1 or 2, 3, characterized in that: the A8 host computer is selected as an AM335X microprocessor based on ARMcortex-A8, with a memory greater than 2G SD card, it is connected to the liquid crystal display that can display various data in real time through the parallel data interface, is respectively connected with GPRS module and RF module by two serial ports, and sends short message to corresponding by described at least one GPRS module SIM card terminal; the A8 host computer and the sensor signal acquisition system are all installed in a monitoring box, and the liquid crystal display is arranged on the front of the monitoring box.