CN114112116A - Transformer oil temperature calibration system and method - Google Patents
Transformer oil temperature calibration system and method Download PDFInfo
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Abstract
The embodiment of the invention discloses a system and a method for checking the oil temperature of a transformer, wherein the system comprises the following components: the current acquisition module is used for acquiring a current signal to be processed and transmitting the current signal to be processed to the analog-digital conversion module; the analog-digital conversion module is used for converting the current signal to be processed into a digital signal to be processed and transmitting the digital signal to be processed to the programmable logic control module; the programmable logic control module is used for processing the digital signal to be processed according to a pre-programmed current/temperature conversion program to obtain a corresponding detection temperature value and writing the detection temperature value into the man-machine interface module; and the human-computer interface module is used for displaying the detection temperature value so as to check the temperature value to be checked according to the detection temperature value. According to the technical scheme of the embodiment of the invention, the actual oil temperature of the transformer is determined in an automatic mode, the traditional complicated process of manually determining the oil temperature by workers is avoided, and the efficiency of checking the oil temperature of the transformer is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of electrical equipment, in particular to a transformer oil temperature calibration system, a transformer oil temperature calibration device, electronic equipment and a storage medium.
Background
At present, when a transformer is in an operating state, the oil temperature inside the transformer is a quantity which continuously changes along with the load of the transformer and the ambient temperature, so that the measurement of the oil temperature of the transformer is one of the basic and key indexes for monitoring the safe operation of electrical equipment.
In the actual transformer oil temperature monitoring process, the situation that the reading of a main transformer oil temperature meter on site is inconsistent with the oil temperature displayed by a background often occurs, at this time, a worker needs to go to the site of the transformer, measure related parameters by using tools such as a high-precision current clamp meter and the like, and after a measurement result is obtained, the oil temperature of the main transformer can be obtained by complex calculation.
Therefore, in the scheme provided by the related art, the process of checking the transformer oil temperature on site in a manual mode is very complicated, and the checking efficiency is low.
Disclosure of Invention
The invention provides a transformer oil temperature calibration system and a transformer oil temperature calibration method, which are used for determining the actual oil temperature of a transformer in an automatic mode, avoiding the traditional complicated process of manually determining the oil temperature by workers and improving the efficiency of the transformer oil temperature calibration.
In a first aspect, an embodiment of the present invention provides a transformer oil temperature calibration system, where the system includes:
the current acquisition module is used for acquiring a current signal to be processed and transmitting the current signal to be processed to the analog-digital conversion module;
the analog-digital conversion module is used for converting the current signal to be processed into a digital signal to be processed and transmitting the digital signal to be processed to the programmable logic control module;
the programmable logic control module is used for processing the digital signal to be processed according to a pre-programmed current/temperature conversion program to obtain a corresponding detection temperature value, and writing the detection temperature value into the man-machine interface module;
and the human-computer interface module is used for displaying the detection temperature value so as to check the temperature value to be checked according to the detection temperature value.
In a second aspect, an embodiment of the present invention further provides a method for checking an oil temperature of a transformer, where the method includes:
when the reading of the transformer oil temperature meter is inconsistent with the reading of the background system, a current acquisition module is used for acquiring a current signal to be processed;
converting the current signal to be processed into a digital signal to be processed by using an analog-digital conversion module;
processing the digital signal to be processed by utilizing a current/temperature conversion program written in a programmable logic control module in advance to obtain a corresponding detection temperature value;
and displaying the detection temperature value by using a human-computer interface module so as to check the temperature value to be checked according to the detection temperature value.
According to the technical scheme of the embodiment of the invention, the transformer oil temperature calibration system comprises a current acquisition module, an analog-digital conversion module, a programmable logic control module and a human-computer interface module, wherein the current acquisition module is used for acquiring a current signal to be processed and transmitting the current signal to be processed to the analog-digital conversion module; the analog-digital conversion module is used for converting the current signal to be processed into a digital signal to be processed and transmitting the digital signal to be processed to the programmable logic control module; the programmable logic control module is used for processing the digital signal to be processed according to a pre-programmed current/temperature conversion program to obtain a corresponding detection temperature value and writing the detection temperature value into the man-machine interface module; the man-machine interface module is used for displaying the detection temperature value so as to check the temperature value to be checked according to the detection temperature value. Aiming at the condition that the reading of the on-site main transformer oil temperature meter is inconsistent with the oil temperature displayed by the background, the actual oil temperature of the transformer can be determined in an automatic mode by developing the transformer oil temperature calibration system and deploying the transformer oil temperature calibration system on the site, so that the traditional fussy process of manually determining the oil temperature by workers is avoided, and the efficiency of the transformer oil temperature calibration is improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a block diagram of a transformer oil temperature calibration system according to a first embodiment of the present invention;
fig. 2 is a block diagram of a transformer oil temperature calibration system according to a second embodiment of the present invention;
fig. 3 is a schematic flow chart of a transformer oil temperature calibration method according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a block diagram of a transformer oil temperature calibration system according to an embodiment of the present invention, which is applicable to a situation, and can execute a transformer oil temperature detection method according to another embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. As shown in fig. 1, the system specifically includes: a current collection module 110, an analog-to-digital conversion module 120, a programmable logic control module 130, and a human-machine interface module 140. The overall system and the modules in the system will be described in detail below with reference to fig. 1.
The current collecting module 110 is configured to collect a current signal to be processed, and transmit the current signal to be processed to the analog-to-digital converting module 120.
Specifically, for an on-site transformer, especially a main transformer, the temperature of oil in the transformer can be measured by a temperature indicating controller including a composite sensor, which can be understood as adding a set of thermal resistance device on a temperature bulb structure of a pressure type temperature controller, further, leading out a temperature signal corresponding to a platinum resistor from a wiring of a temperature controller, transmitting the temperature signal to a temperature transmitter of a control room through a control cable, outputting the temperature signal by the temperature transmitter with a current of 4-20 ma, transmitting the current signal to a measurement and control device, and processing the current signal to obtain an oil temperature value corresponding to the transformer.
Based on this, in this embodiment, the current signal to be processed collected by the current collecting module 110 is the current signal output by the temperature transmitter, and at the same time, the current signal also corresponds to the actual oil temperature value of the current state of the transformer. It is understood that the current collecting module 110 may be any device including a current sensor at least for collecting a current signal reflecting the oil temperature of the transformer, and meanwhile, an isolation amplifier, a filter, etc. may also be included in the device, and the embodiment of the present disclosure is not specifically limited herein. When the current collecting module 110 collects the current signal to be processed, the signal is transmitted to the analog-to-digital converting module 120.
The analog-to-digital conversion module 120 is configured to convert the current signal to be processed into a digital signal to be processed, and transmit the digital signal to be processed to the programmable logic control module 130.
The ADC module 120 is an Analog-to-Digital Converter (ADC), which generally refers to an electronic component for converting an Analog signal into a Digital signal, and specifically, since the Digital signal itself has no practical meaning and only represents a relative magnitude, any ADC requires a reference Analog quantity as a conversion standard, for example, the more common reference standard is the maximum convertible signal magnitude, and the output Digital quantity represents the magnitude of the input signal relative to the reference signal. It is understood that the analog-to-digital conversion module 120 includes at least a circuit for converting an analog signal into a digital signal, and based on the circuit, an analog signal with continuous time and continuous amplitude can be converted into a digital signal with discrete time and discrete amplitude. Meanwhile, in the process of a/D conversion performed by the analog-to-digital conversion module, four processes of sampling, holding, quantizing, and encoding are generally required.
In this embodiment, after the analog-to-digital conversion module 120 receives the current signal to be processed transmitted by the current acquisition module 110, it may perform an a/D conversion on the current signal to be processed, so as to obtain a digital signal to be processed corresponding to the current signal to be processed. In order to obtain the actual oil temperature value of the transformer corresponding to the digital signal to be processed, the analog-to-digital conversion module 120 further needs to transmit the digital signal to be processed to the programmable logic control module 130.
The programmable logic control module 130 is configured to process the digital signal to be processed according to a pre-programmed current/temperature conversion program to obtain a corresponding detection temperature value, and write the detection temperature value into the human-machine interface module 140.
The Programmable Logic Controller (PLC) is a digital operation electronic system designed for application in industrial environment, and the module uses a Programmable memory, in which instructions for executing operations such as Logic operation, sequence control, timing, calculation and arithmetic operation are stored, and various types of mechanical devices or production processes are controlled by digital or analog input and output. Based on this, it can be understood that the PLC is a digital operation controller for automation control, which has a microprocessor, and can load control instructions into a memory at any time for storage and execution. Specifically, the plc module 130 may be composed of a CPU, an instruction and data memory, an input/output interface, a power supply, and a digital-to-analog converter.
In this embodiment, the control command loaded into the plc module 130 may be a current/temperature conversion program written in advance by substation staff, where the current/temperature conversion program involves a plurality of operation processes, and is at least used for numerical conversion between the current value to be processed and the transformer oil temperature value. It can be understood that after the programmable logic control module 130 reads the to-be-processed digital signal transmitted by the analog-to-digital conversion module 120, unit conversion may be performed based on the current/temperature conversion program, so as to obtain a transformer oil temperature value corresponding to the to-be-processed digital signal, that is, obtain a detected temperature value corresponding to the to-be-processed digital signal.
Further, after the programmable logic control module 130 obtains the corresponding detected temperature value through data processing, the detected temperature value needs to be written into the human-machine interface module 140 through the PLC in order to feed back the detected temperature value to the worker.
The human-machine interface module 140 is configured to display the detected temperature value, so as to verify the to-be-verified temperature value according to the detected temperature value.
Specifically, the human-machine interface module 140 may include a display unit, and the display unit is connected to the programmable logic control module 130, that is, after the PLC determines the current detected temperature value of the transformer, the value may be written into the human-machine interface module, and the value is displayed on the target display interface through the display unit.
Further, in order to verify the oil temperature of the transformer, the human-computer interface module 140 may further automatically compare the detected temperature value with a to-be-verified temperature value of the transformer, indicate that the to-be-verified temperature value is accurate when a difference value between the detected temperature value and the to-be-verified temperature value is within a preset threshold range, indicate that the to-be-verified temperature value is not the actual oil temperature of the transformer when the difference value between the detected temperature value and the to-be-verified temperature value reaches or exceeds the preset threshold, replace the to-be-verified temperature value based on the detected temperature value, and display corresponding prompt information to a worker on a target display interface of the display unit.
According to the technical scheme provided by the embodiment, the transformer oil temperature calibration system comprises a current acquisition module, an analog-digital conversion module, a programmable logic control module and a human-computer interface module, wherein the current acquisition module is used for acquiring a current signal to be processed and transmitting the current signal to be processed to the analog-digital conversion module; the analog-digital conversion module is used for converting the current signal to be processed into a digital signal to be processed and transmitting the digital signal to be processed to the programmable logic control module; the programmable logic control module is used for processing the digital signal to be processed according to a pre-programmed current/temperature conversion program to obtain a corresponding detection temperature value and writing the detection temperature value into the man-machine interface module; the man-machine interface module is used for displaying the detection temperature value so as to check the temperature value to be checked according to the detection temperature value. Aiming at the condition that the reading of the on-site main transformer oil temperature meter is inconsistent with the oil temperature displayed by the background, the actual oil temperature of the transformer can be determined in an automatic mode by developing the transformer oil temperature calibration system and deploying the transformer oil temperature calibration system on the site, so that the traditional fussy process of manually determining the oil temperature by workers is avoided, and the efficiency of the transformer oil temperature calibration is improved.
The transformer oil temperature calibration system provided by the embodiment of the invention can execute the transformer oil temperature calibration method provided by other embodiments of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
It should be noted that, the units and modules included in the apparatus are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the embodiment of the invention.
Example two
Fig. 2 is a block diagram of a transformer oil temperature calibration system according to a second embodiment of the present invention, where the transformer oil temperature calibration system further includes a digital-to-analog conversion module, configured to convert a to-be-processed digital signal generated by the programmable logic control module into a corresponding calibration current signal, and transmit the calibration current signal to the measurement and control device, so as to implement automatic calibration of the measurement and control device; meanwhile, in the analog-digital conversion module and the digital-analog conversion module, the analog circuit and the digital circuit are isolated by adopting the optical coupler, so that the data transmission is ensured not to pass through an electrical connection or leakage path, and the safety risk is avoided; by introducing the programmer connected with the man-machine interface module, a worker can quickly obtain a corresponding current/temperature conversion program under the condition of remotely inputting the temperature related data of the transformer. The specific implementation manner of the method can be seen in the technical scheme of the embodiment. The technical terms that are the same as or corresponding to the above embodiments are not repeated herein.
As shown in fig. 2, the transformer oil temperature calibration system may be an integrated oil temperature calibration device, and is composed of a PLC module and other special function modules. Meanwhile, the PLC module is connected with each special module through an expansion bus, and data transmission and parameter setting between the PLC module and each special module can be realized through an FROM/TO instruction. The expansion bus is a group of transmission lines for transmitting information from one or more source components to one or more destination components, and may be understood as a group of signal lines for interconnecting and transmitting information between modules, where the transmitted information includes instructions, data, addresses, and the like; meanwhile, as will be understood by those skilled in the art, in the FROM/TO instruction, the FROM instruction is an instruction TO read the contents of the buffer memory BFM of the specific module associated with the PLC TO the programmable logic controller, and the TO instruction is an instruction TO write the input FROM the PLC TO the buffer memory BFM of the associated specific module.
It should be noted that, in the transmission process, an analog signal (for example, a current signal sent by a transmitter) may generate a transmission error due to electromagnetic interference or compiling, so the transformer oil temperature calibration system according to the embodiment of the present disclosure detects the actual oil temperature of the transformer. However, if the measurement and control device for processing the current signal sent by the transmitter and transmitting the corresponding temperature value to the background fails, the temperature value displayed by the background may be inconsistent with the reading of the transformer oil temperature meter on site. Therefore, in the process of verifying the oil temperature of the transformer, the verification of the measurement and control device is also included. The measurement and control device can be a protection device integrating multiple functions of protection, measurement, control, monitoring, communication, event recording, fault recording, misoperation prevention and the like, can be arranged in a control room near a transformer, and is intelligent electrical equipment of a power station comprehensive automation system of a transformer substation, a power generation plant and the like.
Based on this, in order to verify the measurement and control device in the control room, which is associated with the transformer, a new module needs to be added to the transformer oil temperature verification system provided in the first embodiment. Specifically, on the basis of the transformer oil temperature calibration system provided in the first embodiment, a digital-to-analog conversion module may be further added, and the digital-to-analog conversion module is associated with the PLC module as a special function module, and is configured to acquire a to-be-processed digital signal generated by the programmable logic control module, and transmit a calibration current signal corresponding to the to-be-processed digital signal to the measurement and control device.
It is understood that the Digital-to-Analog conversion module is a D/a Converter (DAC), and similar to the Analog-to-Digital conversion module, at least a circuit for converting a Digital signal into an Analog signal is included in the Digital-to-Analog conversion module. In this embodiment, when the PLC module processes the current signal to be processed and obtains the corresponding digital signal to be processed, it can be written into the buffer memory of the digital conversion module. Further, the digital-to-analog conversion module can obtain a corresponding checking current signal for checking the measurement and control device based on the conversion of the digital signal to be processed, and transmits the checking current signal to the measurement and control device. After the measurement and control device generates a corresponding temperature value according to the verification current signal, the measurement and control device can be verified by comparing the temperature value with a detection temperature value displayed by a display unit in the man-machine display module.
In practical applications, the analog-to-digital conversion module described in the embodiment of the present disclosure may be an FX2N-2AD analog input module, which is specifically a special function module of an analog quantity in the PLC, and may be configured to convert 2-point analog inputs (voltage input and current input) into a 12-bit digital value and transmit the value to the PLC module. Correspondingly, the digital-analog conversion module may be an FX2N-2DA analog output module, and specifically, the module is configured to convert a 2-point digital quantity into an analog output of a voltage (0 to 10VDC) or a current (DC4 to 20ma), and control a peripheral device (such as a measurement and control device in this embodiment) through an analog quantity. It will be understood by those skilled in the art that, taking FX2N-2DA analog output module as an example, both channels can perform digital-to-analog conversion, current output can be performed according to the equipment to the terminals, the conversion speed is 4ms/CH, and when the module is connected to the PLC module through the expansion bus, 8I/O terminals are occupied.
Meanwhile, in the FX2N-2AD analog input module or the FX2N-2DA analog output module, in order to meet safety regulations or reduce noise of a ground loop, an optical coupler is adopted for isolating an analog circuit and a digital circuit, so that data transmission is ensured not to pass through an electrical connection or a leakage path, and safety risks are avoided.
In this embodiment, optionally, the current collecting module is connected to the temperature transmitter to collect a current signal to be processed generated by the temperature transmitter; the temperature transmitter is used for converting a temperature signal associated with the oil temperature of the transformer into a current signal to be processed.
On the basis of the transformer oil temperature calibration system provided by the first embodiment, optionally, the system further comprises a programmer, wherein the programmable logic control module is connected with the programmer through an expansion bus; the programmer is used for receiving the transformer temperature related data sent by the human-computer interface module, generating the current/temperature conversion program based on the transformer temperature related data, and writing the current/temperature conversion program into a buffer register for the programmable logic control module to call.
Specifically, the programmer is a tool for writing data into an editable integrated circuit, is mainly used for programming chips such as a single chip microcomputer/a memory, and is matched with programming software to mainly modify programs in a read-only memory. It can be understood that, in this embodiment, the human-computer interface module is associated with at least one graphic operation terminal (i.e., a terminal for human-computer interaction developed for a worker in a visual form), and further, after the worker inputs data such as a transformer temperature range and the like through the graphic operation terminal in the human-computer interface module, the programmer may determine corresponding transformer temperature associated data, and then generate a corresponding current/temperature conversion program based on the data, and it can be understood that the worker who inputs the data is a target user. After the programmer generates a current/temperature conversion program for the PLC module, if the PLC module receives a current signal to be processed, a detection temperature value corresponding to the current signal to be processed can be obtained by calling the current/temperature conversion program generated by the programmer.
On the basis of the transformer oil temperature calibration system provided in the first embodiment, optionally, a power module may be further included, and is configured to supply power to the transformer oil temperature calibration system.
It should be noted that, in an actual application process, in a process of constructing the transformer oil temperature calibration system according to the embodiment of the present disclosure, except for the PLC module, each special function module has a certain address number, and based on the number, the PLC can accurately determine the specific special function module. Illustratively, the special function modules closest to the PLC modules can be numbered in sequence, and after the transformer oil temperature calibration system is built, the numbers of all the special function modules are determined. It should be understood by those skilled in the art that the specific numbering for each specific functional module may be selected according to actual situations, and the embodiments of the present disclosure are not limited specifically herein.
In the technical scheme of this embodiment, on the basis of the transformer oil temperature calibration system provided in the first embodiment, the transformer oil temperature calibration system further includes a digital-to-analog conversion module, which is configured to convert a to-be-processed digital signal generated by the programmable logic control module into a corresponding calibration current signal, and transmit the calibration current signal to the measurement and control device, so as to implement automatic calibration of the measurement and control device; meanwhile, in the analog-digital conversion module and the digital-analog conversion module, the analog circuit and the digital circuit are isolated by adopting the optical coupler, so that the data transmission is ensured not to pass through an electrical connection or leakage path, and the safety risk is avoided; by introducing the programmer connected with the human-computer interface module, a worker can quickly obtain a corresponding current/temperature conversion program under the condition of remotely inputting the temperature related data of the transformer
EXAMPLE III
Fig. 3 is a schematic flow chart of a transformer oil temperature calibration method according to a third embodiment of the present invention, which is applicable to the calibration of the transformer oil temperature and the measurement and control device in the control room, and the method can be executed by the transformer oil temperature calibration system according to the first and second embodiments of the present disclosure.
As shown in fig. 3, the method specifically includes the following steps:
and S310, when the reading of the transformer oil temperature meter is inconsistent with the reading of the background system, acquiring a current signal to be processed by using a current acquisition module.
In this embodiment, the current signal to be processed collected by the current collection module is a current signal output by the temperature transmitter, and the current signal corresponds to the actual oil temperature value of the current state of the transformer. It is understood that the current collecting module may be any device including a current sensor, and is at least used for collecting a current signal reflecting the oil temperature of the transformer, and meanwhile, an isolation amplifier, a filter, and the like may also be included in the device, and the embodiment of the present disclosure is not specifically limited herein. When the current acquisition module acquires a current signal to be processed, the signal can be transmitted to the analog-digital conversion module.
In the practical application process, optionally, the current acquisition module is used for acquiring the current signal to be processed generated by the temperature transmitter. The temperature transmitter is used for converting a temperature signal associated with the oil temperature of the transformer into a current signal to be processed.
And S320, converting the current signal to be processed into a digital signal to be processed by using the analog-digital conversion module.
The analog-to-digital conversion module is an a/D converter, and in the process of performing a/D conversion by the analog-to-digital conversion module, four processes of sampling, holding, quantizing, and encoding are generally required. Specifically, after the analog-to-digital conversion module receives the current signal to be processed transmitted by the current acquisition module, a/D conversion can be performed on the current signal to be processed, so as to obtain a digital signal to be processed corresponding to the current signal to be processed. In order to obtain the actual oil temperature value of the transformer corresponding to the digital signal to be processed, the analog-digital conversion module needs to transmit the digital signal to be processed to the programmable logic control module.
S330, processing the processed digital signal by utilizing a current/temperature conversion program which is programmed in the programmable logic control module in advance to obtain a corresponding detection temperature value.
The programmable logic control module adopts a programmable memory, stores instructions for executing operations such as logic operation, sequence control, timing, calculation, arithmetic operation and the like in the programmable memory, and controls various types of mechanical equipment or production processes through digital or analog input and output. Based on this, it can be understood that the PLC is a digital operation controller for automation control, which has a microprocessor, and can load control instructions into a memory at any time for storage and execution. Specifically, the programmable logic control module may be composed of a central processing unit CPU, an instruction and data memory, an input/output interface, a power supply, a digital-to-analog conversion, and other functional units.
In this embodiment, the control instruction loaded into the programmable logic control module may be a current/temperature conversion program written in advance by a substation worker, where the current/temperature conversion program involves a plurality of operation processes, and is at least used for numerical conversion between a current value to be processed and a transformer oil temperature value. It can be understood that, after the programmable logic control module reads the to-be-processed digital signal transmitted by the analog-digital conversion module, the programmable logic control module may perform unit conversion based on the current/temperature conversion program, so as to obtain a transformer oil temperature value corresponding to the to-be-processed digital signal, that is, obtain a detection temperature value corresponding to the to-be-processed digital signal.
Furthermore, after the programmable logic control module obtains a corresponding detection temperature value through data processing, the detection temperature value needs to be written into the human-computer interface module through the PLC in order to feed back the detection temperature value to the worker.
And S340, displaying the detected temperature value by using the human-computer interface module so as to verify the temperature value to be verified according to the detected temperature value.
The human-computer interface module can comprise a display unit, and the display unit is connected with the programmable logic control module, namely, after the PLC determines the current detection temperature value of the transformer, the value can be written into the human-computer interface module, and the value is displayed on a target display interface through the display unit.
Furthermore, in order to realize the checking of the transformer oil temperature, the human-computer interface module can also automatically compare the detected temperature value with the temperature value to be checked of the transformer, when the difference value of the detected temperature value and the temperature value to be checked is within the preset threshold range, the temperature value to be checked is indicated to be accurate, when the difference value of the detected temperature value and the temperature value to be checked reaches or exceeds the preset threshold, the temperature value to be checked is indicated to be not the actual transformer oil temperature, meanwhile, the temperature value to be checked is replaced based on the detected temperature value, and corresponding prompt information is displayed to a worker on a target display interface of the display unit.
And S350, acquiring the to-be-processed digital signal generated by the programmable logic control module by using the digital-analog conversion module, and transmitting a check current signal corresponding to the to-be-processed digital signal to the measurement and control device.
In this embodiment, in order to verify the temperature measurement and control device associated with the transformer in the control room and used for generating a corresponding temperature value according to the verification current signal, a digital-to-analog conversion module is further required to acquire a to-be-processed digital signal generated by the programmable logic control module. It is understood that the digital-to-analog conversion module is a D/a converter, and similar to the analog-to-digital conversion module, at least a circuit for converting a digital signal into an analog signal is included in the digital-to-analog conversion module. In this embodiment, when the PLC module processes the current signal to be processed and obtains the corresponding digital signal to be processed, it can be written into the buffer memory of the digital conversion module. Further, the digital-to-analog conversion module can obtain a corresponding checking current signal for checking the measurement and control device based on the conversion of the digital signal to be processed, and transmits the checking current signal to the measurement and control device. After the measurement and control device generates a corresponding temperature value according to the verification current signal, the measurement and control device can be verified by comparing the temperature value with a detection temperature value displayed by a display unit in the man-machine display module.
According to the technical scheme of the embodiment, when the reading of the transformer oil temperature meter is inconsistent with the reading of the background system, the current acquisition module is used for acquiring a current signal to be processed; converting the current signal to be processed into a digital signal to be processed by using an analog-digital conversion module; processing the processed digital signal by using a current/temperature conversion program which is written in the programmable logic control module in advance to obtain a corresponding detection temperature value; displaying the detection temperature value by using a human-computer interface module so as to check the temperature value to be checked according to the detection temperature value; the digital-analog conversion module is used for acquiring the to-be-processed digital signals generated by the programmable logic control module, and the checking current signals corresponding to the to-be-processed digital signals are transmitted to the measurement and control device, so that the actual oil temperature of the transformer is determined in an automatic mode, the traditional tedious process of manually determining the oil temperature by workers is avoided, and the efficiency of checking the oil temperature of the transformer is improved; meanwhile, the to-be-processed digital signals generated by the programmable logic control module are converted into corresponding checking current signals, and the checking current signals are transmitted to the measurement and control device, so that the measurement and control device is checked.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A transformer oil temperature calibration system, characterized by, includes:
the current acquisition module is used for acquiring a current signal to be processed and transmitting the current signal to be processed to the analog-digital conversion module;
the analog-digital conversion module is used for converting the current signal to be processed into a digital signal to be processed and transmitting the digital signal to be processed to the programmable logic control module;
the programmable logic control module is used for processing the digital signal to be processed according to a pre-programmed current/temperature conversion program to obtain a corresponding detection temperature value, and writing the detection temperature value into the man-machine interface module;
and the human-computer interface module is used for displaying the detection temperature value so as to check the temperature value to be checked according to the detection temperature value.
2. The system of claim 1, further comprising a digital-to-analog conversion module, wherein,
the programmable logic control module is connected with the digital-analog conversion module through an expansion bus;
the digital-analog conversion module is used for acquiring the digital signal to be processed generated by the programmable logic control module and transmitting a check current signal corresponding to the digital signal to be processed to the measurement and control device;
and the measurement and control device generates a corresponding temperature value according to the check current signal.
3. The system of claim 1, comprising:
the current acquisition module is connected with the temperature transmitter to acquire the current signal to be processed generated by the temperature transmitter;
the temperature transmitter is used for converting a temperature signal associated with the oil temperature of the transformer into the current signal to be processed.
4. The system of claim 1, comprising:
in the analog-digital conversion module, an optical coupler is adopted for isolating an analog circuit and a digital circuit.
5. The system of claim 1, further comprising a programmer, wherein,
the programmable logic control module is connected with the programmer through an expansion bus;
the programmer is used for receiving the transformer temperature related data sent by the human-computer interface module, generating the current/temperature conversion program based on the transformer temperature related data, and writing the current/temperature conversion program into a buffer register for the programmable logic control module to call.
6. The system of claim 5, comprising:
the human-computer interface module is also used for determining the temperature related data of the transformer according to the temperature range input by a target user from the graphic operation terminal;
wherein the human-machine interface module is associated with at least one graphical operating terminal.
7. The system of any of claims 1-6, further comprising a power module, wherein,
and the power supply module is used for supplying power to the transformer oil temperature calibration system.
8. A transformer oil temperature calibration method is characterized by comprising the following steps:
when the reading of the transformer oil temperature meter is inconsistent with the reading of the background system, a current acquisition module is used for acquiring a current signal to be processed;
converting the current signal to be processed into a digital signal to be processed by using an analog-digital conversion module;
processing the digital signal to be processed by utilizing a current/temperature conversion program written in a programmable logic control module in advance to obtain a corresponding detection temperature value;
and displaying the detection temperature value by using a human-computer interface module so as to check the temperature value to be checked according to the detection temperature value.
9. The method of claim 8, further comprising:
acquiring a to-be-processed digital signal generated by the programmable logic control module by using a digital-to-analog conversion module, and transmitting a check current signal corresponding to the to-be-processed digital signal to a measurement and control device;
and the measurement and control device generates a corresponding temperature value according to the check current signal.
10. The method of claim 8, wherein the collecting the current signal to be processed with the current collecting module comprises:
acquiring the current signal to be processed generated by the temperature transmitter by using the current acquisition module;
the temperature transmitter is used for converting a temperature signal associated with the oil temperature of the transformer into the current signal to be processed.
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