CN111272949A

CN111272949A - Intelligent transformer on-line monitoring device

Info

Publication number: CN111272949A
Application number: CN201811468929.1A
Authority: CN
Inventors: 刘方旭
Original assignee: Yantai Yubo Heyuan Biotechnology Co ltd
Current assignee: Yantai Yubo Heyuan Biotechnology Co ltd
Priority date: 2018-12-04
Filing date: 2018-12-04
Publication date: 2020-06-12

Abstract

The invention provides an intelligent transformer on-line monitoring device, which comprises a transformer, a gas sensor array, a signal processing unit, an AD conversion unit, an LED display unit, a JTAG interface, an SDRAM unit, a FLASH unit, a crystal oscillator circuit and a reset circuit, the gas sensor array is arranged in the transformer, the gas sensor array is connected with the signal processing unit, the signal processing unit is connected with the AD conversion unit, the LED display unit, the JTAG interface, the SDRAM unit, the FLASH unit, the crystal oscillator circuit, the reset circuit, the serial communication unit and the power supply unit are respectively connected with the micro control unit, and the serial communication unit is connected with the upper computer.

Description

Intelligent transformer on-line monitoring device

Technical Field

The invention relates to the field of transformers, in particular to an intelligent transformer online monitoring device.

Background

As an important link related to national production and life, the power system is continuously improved along with the continuous progress of the society. As one of the important parts of the power system, the national power grid is also developing towards the intellectualization of the power grid following the development direction of the world. In several important links of the smart grid, the development and progress of the smart substation directly affect the progress of the whole smart grid. The transformer is used as main electrical equipment of the transformer substation, the intelligent degree of the transformer directly determines the development degree of the intelligent transformer substation, and the transformer has important research significance. The reliability of the transformer line directly influences whether the whole power system can safely and stably operate.

The progress of the transformer state online monitoring technology is mature day by day, and the development of the fault diagnosis technology is driven. The transformer fault diagnosis technology theory is very few in the past, the transformer fault diagnosis can be basically judged only by people with relevant working experience according to experience, and due to the fact that the transformer faults are various in types and the fault phenomena are similar occasionally, the judgment method is difficult to avoid to have faults, and the fault detection method cannot meet the diagnosis requirement increasingly along with the continuous expansion of the number and the scale of transformer equipment of a power system.

Disclosure of Invention

The invention aims to solve the defects and provides an intelligent transformer online monitoring device

The purpose of the invention is realized by the following technical scheme:

the intelligent transformer on-line monitoring device comprises a transformer, a gas sensor array, a signal processing unit, an AD (analog-to-digital) conversion unit, an LED (light emitting diode) display unit, a JTAG (joint test action group) interface, an SDRAM (synchronous dynamic random access memory) unit, a FLASH unit, a crystal oscillator circuit, a reset circuit, a serial communication unit, a power supply unit, an upper computer and a micro-control unit, wherein the gas sensor array is installed inside the transformer, the gas sensor array is connected with the signal processing unit, the signal processing unit is connected with the AD conversion unit, the LED display unit, the JTAG interface, the SDRAM unit, the FLASH unit, the crystal oscillator circuit, the reset circuit, the micro-control unit.

The micro control unit adopts an ARM chip of LPC 2214.

The serial port communication unit adopts an RS232 serial port.

The AD conversion unit adopts MAX197 chips.

The invention has the following beneficial effects:

the invention has reasonable design and convenient use, adopts the gas sensor array to monitor the gas in the transformer, processes the signal through the signal processing unit and the AD conversion unit, is accurate and quick, has stable monitoring operation and has good application prospect.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a serial communication circuit of the present invention;

FIG. 3 shows an AD conversion unit according to the present invention;

FIG. 4 is a signal processing circuit of the present invention;

fig. 5 is a power supply circuit of the present invention.

Detailed Description

The invention is further described with reference to the accompanying drawings in which:

as shown in fig. 1, the intelligent transformer online monitoring device includes a transformer 1, a gas sensor array 2, a signal processing unit 3, an AD conversion unit 4, an LED display unit 5, a JTAG interface 6, an SDRAM unit 7, a FLASH unit 8, a crystal oscillator circuit 9, a reset circuit 10, a serial communication unit 11, a power supply unit 12, an upper computer 13 and a micro control unit 14, wherein the gas sensor array 2 is installed inside the transformer 1, the gas sensor array 2 is connected with the signal processing unit 3, the signal processing unit 3 is connected with the AD conversion unit 4, the LED display unit 5, the JTAG interface 6, the SDRAM unit 7, the FLASH unit 8, the crystal oscillator circuit 9, the reset circuit 10, the serial communication unit 11 and the power supply unit 12 are respectively connected with the micro control unit 14, and the serial communication unit 11 is connected with the upper computer 13.

The micro control unit adopts an ARM chip of LPC 2214.

The serial port communication unit adopts an RS232 serial port.

The AD conversion unit adopts MAX197 chips.

The working principle is as follows: the system comprises a gas data acquisition function with a plurality of channels, can preprocess acquired data to obtain acquired digital information, and realizes communication between a PC (personal computer) and a lower computer through the design of an RS-232 serial interface circuit, wherein the realization process of the whole system is as follows: the method comprises the steps of preprocessing gas information acquired by a sensor through signals, converting data in real time through an AD signal collector, transmitting the data into a central processing unit LPC2214, finishing data acquisition of the gas signals by combining an embedded chip, pre-estimating the state of a transformer by combining an upper computer, and displaying the state information of the transformer on the upper computer, so that the management of people is facilitated.

As shown in fig. 3, the AD conversion unit: the HBEN pin of the MAX197 is connected with an I/O interface of the processor, so that the processor can read more control bits of 4 and 8, and the external interrupt 0 of the processor is connected with an interrupt pin ending with the MAX 197.

As shown in fig. 2, the serial communication circuit: the CPU of LPC2214 has two registers with the same function, when it is connected with the upper computer interface, because the supply voltage of the hardware system is 3.3V, it needs a MAX232 to implement level conversion, to implement communication with the PC. The UART0 interface of LPC2214 is connected with a 9-core RS-232 line, RxD0 in a pin of the line is a data input interface for receiving serial data, and TxD0 is a data output interface for serially transmitting data.

As shown in fig. 4, the signal processing circuit: the potentiometer AD8400 is combined with an NE5532P operational amplifier and a negative voltage converter to form an operational amplifier circuit with adjustable gain, and the gain is controlled by a CPU. On the basis of the first-order filtering of the NE5532P, a first-order filtering circuit is added to form a second-order filtering link, so that the output current waveform is effectively improved, and the noise influence is removed.

Claims

1. Intelligent transformer on-line monitoring device, including transformer, gas sensor array, signal processing unit, AD converting unit, LED display element, JTAG interface, SDRAM unit, FLASH unit, crystal oscillator circuit, reset circuit, serial ports communication unit, power supply unit, host computer and micro control unit, its characterized in that: the gas sensor array is installed in the transformer and connected with the signal processing unit, the signal processing unit is connected with the AD conversion unit, the LED display unit, the JTAG interface, the SDRAM unit, the FLASH unit, the crystal oscillator circuit, the reset circuit, the serial communication unit and the power supply unit are respectively connected with the micro-control unit, and the serial communication unit is connected with the upper computer.

2. The intelligent transformer on-line monitoring device of claim 1, characterized in that: the micro control unit adopts an ARM chip of LPC 2214.

3. The intelligent transformer on-line monitoring device of claim 1, characterized in that: the serial port communication unit adopts an RS232 serial port.

4. The intelligent transformer on-line monitoring device of claim 1, characterized in that: the AD conversion unit adopts a MAX197 chip.