CN216899331U - Voltage regulating transformer temperature on-line monitoring device - Google Patents

Abstract

The utility model belongs to the technical field of optical fiber temperature measurement, and discloses an online temperature monitoring device for a voltage regulating transformer, wherein a photoelectric processing module is used for providing hardware support; the communication management module is connected with the photoelectric processing module and is used for managing and controlling the operation and communication of the photoelectric processing module; the plastic optical fiber is inserted on the photoelectric processing module and used for realizing the output of signals of the photoelectric processing module; and the optical fiber butt joint device is connected with the plastic optical fiber, realizes concentric butt joint of the plastic optical fiber and the quartz optical fiber and is used for providing a signal transmission medium. The utility model can directly measure the real-time temperature of the hot spot easily generated in the voltage regulating transformer, monitor, predict and prevent accidents of the hot spot of the voltage regulating transformer in real time, acquire running data in real time, judge the actual overload capacity of equipment, detect and display the temperature rise of a winding by using the optical fiber temperature sensor in the three-phase winding of the dry-type transformer, and automatically control the start and stop of the fan according to the temperature rise.

Description

Voltage regulating transformer temperature on-line monitoring device

Technical Field

The utility model belongs to the technical field of optical fiber temperature measurement, and particularly relates to an online temperature monitoring device for a voltage regulating transformer.

Background

Since the twentieth century, the practicality of the contact optical fiber temperature measurement technology in the real-time online monitoring of the power equipment hotspot is researched more and more widely, including distributed optical fiber temperature measurement, optical fiber grating temperature measurement, interferometric optical fiber temperature measurement and photoluminescence optical fiber temperature measurement, wherein the photoluminescence optical fiber temperature measurement technology becomes one of the most promising power equipment hotspot online monitoring modes by the characteristics of high temperature and high pressure resistance, high precision, low cost and the like. The principle of photoluminescence temperature measurement is as follows: when the substance is excited by the outside, the energy level transition can occur, and meanwhile, the light-emitting afterglow attenuation speed is related to the temperature, the higher the temperature is, the faster the light-emitting afterglow attenuation speed is, and the lower the temperature is, the slower the light-emitting afterglow attenuation speed is. Therefore, the temperature of the object to be measured can be obtained only by testing the time of the light-emitting afterglow attenuation. Compared with a common temperature sensor, the optical temperature sensor has the unique advantages of small volume, light weight, no electromagnetic interference, corrosion resistance, high sensitivity and the like. Therefore, the method for accurately measuring the hot spot temperature of the cable joint on line in real time by embedding the sensor in the cable joint and by using the optical fiber to transmit signals under the conditions of high voltage and high magnetic field is a preferred method for measuring the hot spot temperature of the cable joint in the future.

With the progress of railway modernization and the development of high-speed railways, higher and higher requirements are put forward on the safety and reliability of a railway power supply system. The safe operation of the railway power supply system is related to the safety and punctuality of railway transportation and the safety of lives and properties of passengers. In order to improve the reliability of power supply, the operation reliability of the regulating transformer is of great importance, but at present, electronic temperature measuring devices such as Pt100 and the like are placed at the ventilation opening of the regulating transformer, and the sensors are often burnt out due to high-voltage induced current, so that the regulating transformer is damaged. Therefore, the fluorescent optical fiber temperature measurement has important significance for monitoring the running state of the voltage regulating transformer in real time, mastering the running condition at any time, carrying out dynamic analysis, formulating safety measures, maintaining in good time and ensuring that the voltage regulating transformer is in a good state.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the related art, the disclosed embodiment of the utility model provides an online monitoring device for the temperature of a voltage regulating transformer, which can realize online monitoring of the temperature of the voltage regulating transformer. And monitoring the operating state of the voltage regulating transformer to realize fault early warning. The technical scheme is as follows:

this regulating transformer temperature on-line monitoring device includes:

the photoelectric processing module is used for providing hardware support and data processing;

the communication management module is connected with the photoelectric processing module and is used for managing and controlling the operation and communication of the photoelectric processing module;

the plastic optical fiber is inserted on the photoelectric processing module and used for realizing the output of signals of the photoelectric processing module;

the optical fiber butt joint device is connected with the plastic optical fiber, realizes concentric butt joint of the plastic optical fiber and the quartz optical fiber and is used for providing a signal transmission medium;

and the fluorescent sleeve is welded at the tail end of the quartz optical fiber and used for realizing the temperature sensing.

In one embodiment, a 485 interface is installed on the communication management module and is used for realizing data transmission.

In one embodiment, the photoelectric processing module is connected with the communication management module in a combined manner, so that one communication management module manages a plurality of photoelectric processing modules.

In one embodiment, the quartz optical fiber is externally mounted with a clamp.

In one embodiment, the quartz optical fiber is placed close to the inner wall of the vent hole of the voltage regulating transformer and is fixedly installed with the inner wall of the vent hole of the voltage regulating transformer in an adhering mode.

By combining all the technical schemes, the utility model has the advantages and positive effects that:

the utility model can directly measure the real-time temperature of the easily-heating point in the voltage regulating transformer, monitor, predict and prevent accidents in real time, acquire operation data in real time, judge the actual overload capacity of equipment, detect and display the temperature rise of the winding by using the optical fiber temperature sensor in the three-phase winding of the dry-type transformer, automatically control the starting and stopping of the fan according to the temperature rise condition, and control over-temperature alarm and over-temperature tripping so as to ensure the safe operation of the transformer and prolong the service life of the transformer. The method can fully exert the load capacity of the equipment within a reasonable range, improve the economic benefit, and can be widely applied to the online monitoring of high-speed railways and power transmission voltage regulating transformers. The temperature measuring device has the advantages of low cost, safety, reliability, simple installation process and capability of directly measuring the temperature of the contact, and improving the accuracy and precision of the temperature measurement in the voltage regulating transformer.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram of a voltage regulating transformer temperature online monitoring device provided in an embodiment of the present invention.

Fig. 2 is a connection diagram of the output cable plug according to the embodiment of the present invention, wherein a (+), a (-) indicate the positive and negative poles of the output signal corresponding to the temperature of the phase winding of the transformer a; b (+), B (-) are represented as the positive and negative poles of the output signal corresponding to the temperature of the winding of the phase B of the transformer; c (+), C (-) are the positive and negative poles of the output signal corresponding to the temperature of the winding of the phase C of the transformer; r (+), R (-) represent the signal positive and negative poles communicating with the meter and the upper computer.

Fig. 3 is a diagram of a communication connection mode between the RS485 and an upper computer according to an embodiment of the present invention.

Fig. 4 is an absorption spectrum of a ruby provided by an embodiment of the present invention.

Fig. 5 is an emission spectrum of a ruby provided by an embodiment of the present invention.

Fig. 6 is a schematic circuit diagram of an online temperature monitoring device for a voltage regulating transformer according to an embodiment of the present invention.

In the figure: 1. a photoelectric processing module; 2. a communication management module; 3. a plastic optical fiber; 4. a silica optical fiber; 5. an optical fiber docking device; 6. a fluorescent sleeve; 7. a clip; 8. 485 interface.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

As shown in fig. 1 to 6, the online temperature monitoring device for the voltage regulating transformer comprises: a photoelectric processing module 1 for providing hardware support and data processing; a communication management module 2 connected with the photoelectric processing module 1 and used for managing and controlling the operation and communication of the photoelectric processing module 1; the plastic optical fiber 3 is inserted on the photoelectric processing module 1 and used for realizing the signal output of the photoelectric processing module 1; the optical fiber butt-joint device 5 is connected with the plastic optical fiber 3, realizes the concentric butt joint of the plastic optical fiber 3 and the quartz optical fiber 4, and is used for providing a medium for signal transmission; and the fluorescent sleeve 6 is welded at the tail end of the quartz optical fiber 4 and used for realizing temperature sensing. The clamp 7 is arranged outside the quartz optical fiber 4, and the quartz optical fiber 4 is fixedly arranged through the clamp 7.

The online monitoring device for the temperature of the regulating transformer is communicated with an upper computer through a communication management module 2, and is remotely transmitted to other industrial control systems or an upper computer through current or voltage analog signals corresponding to output three-phase winding temperature values, and an analog quantity acquisition device is added to the upper computer in such a mode. The three output signals are subjected to photoelectric isolation and then sent to other industrial control systems or collected by an upper computer, and the output cable plugs are connected according to the diagram shown in FIG. 2, wherein A (+), A (-) represent the positive and negative electrodes of the output signals corresponding to the temperature of the phase winding A of the transformer; b (+), B (-) are represented as the positive and negative poles of the output signal corresponding to the temperature of the winding of the phase B of the transformer; c (+), C (-) are the positive and negative poles of the output signal corresponding to the temperature of the winding of the phase C of the transformer; r (+), R (-) represent the signal positive and negative poles communicating with the instrument and the upper computer.

The communication management module 2 communicates with an upper computer through a 485 interface 8: the 485 interface 8 allows an upper computer to simultaneously hang a plurality of temperature controllers, the 485 interface 8 adopts twisted pair (shielded) wires or coaxial cables for communication, one end of the 485 interface is connected to a serial port of the upper computer through an RS232/485 converter, the other end of the 485 interface is connected to the plurality of temperature controllers after being connected in parallel, the transmission distance can reach 1200 meters, and the connection mode is shown in figure 3.

The working mechanism of the fluorescent sleeve 6 for realizing temperature measurement is based on the basic physical phenomenon of photoluminescence. Some fluorescent materials fluoresce when excited by blue-violet or ultraviolet light, and their fluorescence lifetime is related to the temperature of the fluorescent material. For some fluorescent materials, the fluorescent emissions at different wavelengths have different temperature characteristics, and their fluorescent lifetimes have some functional relationship with temperature. Under this condition the temperature of the material can be calibrated by measuring the fluorescence lifetime. When the substance is excited by the outside, the energy level transition can occur, and meanwhile, the light-emitting afterglow attenuation speed is related to the temperature, the higher the temperature is, the faster the light-emitting afterglow attenuation speed is, and the lower the temperature is, the slower the light-emitting afterglow attenuation speed is. Therefore, the temperature of the object to be measured can be obtained only by testing the time of the light-emitting afterglow attenuation. Compared with a common temperature sensor, the optical temperature sensor has the unique advantages of small volume, light weight, no electromagnetic interference, corrosion resistance, high sensitivity and the like.

Fig. 4 shows the absorption spectrum of ruby. The fluorescent material has two absorption peaks at 410nm and 550nm, and strong absorption light with the central wavelength of 410nm is injected to excite the fluorescent material. Fig. 5 shows the emission spectrum of ruby. It has a strong radiation peak at 694 nm.

Ultraviolet light emitted by a light source of an ultraviolet mercury lamp passes through a schematic diagram of a ruby fluorescence temperature sensor of a light modulator, a green LED is used as an excitation source, the green LED can inject strong absorption light with the central wavelength of 550nm, and an absorption spectrum diagram of ruby is shown in FIG. 4. In the red visible spectrum, the overlapping part of the fluorescence emission spectrum, the radiation of the green LED contains a weak emission peak, F1 is a short-wave filter,

the schematic diagram of the ruby fluorescence temperature sensor is shown in fig. 4, blue excitation light emitted by an LED blue light diode with the central wavelength of 410nm under the modulation of a drive circuit is reflected into a plastic optical fiber 3 through a dichroic mirror, the excitation light can pass through the plastic optical fiber 3 and then irradiate onto a fluorescent material of a fluorescent sleeve, fluorescence emitted by the fluorescent material is detected by a receiving diode after passing through a quartz optical fiber 4 and the dichroic mirror, is input into a single chip microcomputer through amplification and filtering, and is sent to an upper computer after being processed by a photoelectric processing module 1.

Optical fiber temperature measurement modbus communication protocol

The communication mode is modbus-rtu, the CRC16 check is carried out, and the baud rate can be adjusted by 2400, 4800 and 9600

1. Analog input (read-only with '03' function code)

Reading zero-address data, namely reading a temperature value, wherein each datum is two bytes, at most four bytes can be read, only two commands can be used, three bytes and four bytes can be read, and the four bytes respectively have the following meanings: 1. the amplification factor of the arranged receiving tube; 2. the intensity of the emitted light (controlling the current magnitude of the current source); 3. temperature value (zero degree with table output 2732, 0 degree of output-273.2 degree); 4. the time of decay of the original measured fluorescence is output.

Read temperature is only valid for the two commands above, and differs from the other 03 commands!

Following the address 01 corresponds to the command 03

Each data is an integer, two bytes of data. The address 01 is the correction data of the manufacturer to the temperature, 02 is the correction data of the user to the temperature, 03 is the corresponding data which sets the communication baud rate of 2-2400, 1-4800 (default) and 0-9600 and corresponds to-40-125 degrees from 8-41 addresses, and a special data table which is input by the manufacturer in advance is read out.

And (3) sending: 01030000000305 CB 01 device address; 03 function code (holding register); 0000 start address; 0003, 3 data; 05CB CRC16 checks.

Receiving: 010306000000000000 CRC CRC 01 is an address; 03 function code; 06 data bytes (6 bytes); every two bytes at the back represent a number, which is 3 in total; the last two bytes are the CRC.

2. Setting fixed value information table (write corresponding to 0X06, 0X10, read-write)

1) And sending a fixed value: 06 (Preset Single register)

Each data is an integer, two bytes of data. Address 0: changing the address of the equipment (1-250), and when the current address is unknown, the addr can be replaced by 0; the address 01 is the correction data of the manufacturer to the temperature, 02 is the correction data of the user to the temperature, 03 is the corresponding data which sets the communication baud rate of 2-2400, 1-4800 (default) and 0-9600 (write 0-2 valid), corresponds to-40-125 degrees from 8-41 addresses, and is written into a special data table input by the manufacturer in advance. One data at a time. (1 degree corresponding data is 16)

When writing the temperature correction data, the data are divided into positive and negative, when writing the positive number, the data are accumulated, when writing the negative number, the data are subtracted from the original data, and when writing the zero, the data are cleared. Negative numbers are represented by the same positive number, inverted plus 1.

Returns to original state

2) 10 (preset multi-register) function code:

writing a set of data to the memory, only for data tables preset by the manufacturer

The upper computer sends addr 1000080004080001000200030004 CRC to write registers 08 to 11 of the 01 device into 1, 2, 3 and 4 respectively; CRC.

addr device address 10 function code; 0008 register start address; 0004 number of registers; 08 data byte number (8 bytes); 0001 first register write 1; 0002 second register write 2; 0003 third register write 3; 0004 fourth register write 4; the last two bytes are CRC error checks

And (4) replying to remove data: the format is addr 10000004 CRC; .

Note: a maximum of 10 data can be written at a time.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention disclosed herein, which is within the spirit and principle of the present invention, should be covered by the present invention.

Claims (5)

1. The utility model provides a regulating transformer temperature on-line monitoring device which characterized in that, regulating transformer temperature on-line monitoring device includes:

the photoelectric processing module (1) is used for providing hardware support and data processing;

the communication management module (2) is connected with the photoelectric processing module (1) and is used for managing and controlling the operation and communication of the photoelectric processing module (1);

the plastic optical fiber (3) is inserted on the photoelectric processing module (1) and used for outputting signals of the photoelectric processing module (1);

the optical fiber butt joint device (5) is connected with the plastic optical fiber (3), realizes concentric butt joint of the plastic optical fiber (3) and the quartz optical fiber (4), and is used for providing a signal transmission medium;

and the fluorescent sleeve (6) is welded at the tail end of the quartz optical fiber (4) and is used for realizing the temperature sensing.

2. The online temperature monitoring device for the voltage regulating transformer according to claim 1, wherein a 485 interface (8) is installed on the communication management module (2) and is used for realizing data transmission.

3. The online temperature monitoring device for the voltage regulating transformer according to claim 1, wherein the photoelectric processing module (1) is connected with the communication management module (2) in a combined manner, so that one communication management module (2) can manage a plurality of photoelectric processing modules (1).

4. The online temperature monitoring device for the voltage regulating transformer according to claim 1, wherein a clamp (7) is mounted outside the quartz optical fiber (4).

5. The online temperature monitoring device for the voltage regulating transformer as claimed in claim 1, wherein the quartz optical fiber (4) is closely attached to the inner wall of the vent hole of the voltage regulating transformer and is fixedly attached to the inner wall of the vent hole of the voltage regulating transformer in an adhering manner.

Images