CN113552863A - Additional temperature rise calibrating device and method for transformer winding temperature controller - Google Patents
Additional temperature rise calibrating device and method for transformer winding temperature controller Download PDFInfo
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- CN113552863A CN113552863A CN202110918939.6A CN202110918939A CN113552863A CN 113552863 A CN113552863 A CN 113552863A CN 202110918939 A CN202110918939 A CN 202110918939A CN 113552863 A CN113552863 A CN 113552863A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
Abstract
The invention provides an additional temperature rise calibrating device and method of a transformer winding temperature controller, wherein the calibrating device comprises a main control module, a signal module and a power amplification module, the current input into a converter can be set according to requirements, an output feedback module is arranged at the output end of the calibrating device to sample and stably control the current input into the converter, and the input feedback module is arranged at the input end of the calibrating device to sample and stably control the current output by the converter. The method comprises the steps of stably controlling the current input into the converter through an output feedback module of the device, measuring the current output by the converter and calculating the transformation ratio of the converter, setting the feedback coefficient of the input feedback module of the device according to the transformation ratio of the converter, and accurately and stably controlling the current output by the converter through the input feedback module, so that the temperature rise of accessories generated by the current output by the converter can be conveniently measured.
Description
Technical Field
The invention relates to the field of verification of transformer winding temperature controllers, in particular to an additional temperature rise verification device and method of a transformer winding temperature controller.
Background
The transformer winding temperature controller is a special instrument for the transformer designed by adopting the principle of additional temperature rise, is used for monitoring the temperature of a transformer winding and can control the action of heat dissipation equipment of the transformer through a control end. In the calibration process of the transformer winding temperature controller, temperature rises of a temperature sensing component (a temperature bulb), a current transformer and accessories need to be calibrated. In the general laboratory, in the course of testing, it is necessary to use discrete devices of thyristor voltage regulator, digital multimeter, thermostatic bath and thermocouple, etc., to regulate the thermostatic bath to a certain temperature, and put the temperature-sensing component of the temperature controller into it, and connect the load through the thyristor voltage regulator to produce the input current of the converter, the output current of the converter flows through the electric heating element, produce the additional temperature rise to make the elastic element of the temperature controller produce an additional displacement, thus produce a temperature indicated value which is higher by a temperature difference than the thermostatic bath. The calibration method needs discrete devices, is troublesome to connect in the actual operation process, and has low calibration precision and high power consumption.
Disclosure of Invention
In order to solve the problems, the invention provides an additional temperature rise calibrating device and method for a transformer winding temperature controller. The method comprises the steps of stably controlling the current input into the converter through the output feedback module, measuring the current output by the converter and calculating the transformation ratio, further setting the output current of the converter and the feedback coefficient of the input feedback module according to the transformation ratio of the converter, accurately and stably controlling the current output by the converter through the input feedback module, and conveniently measuring the temperature rise of accessories generated by the output current of the converter.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an additional temperature rise calibrating device for a transformer winding temperature controller comprises a main control module, a signal module, a power amplification module, an output feedback module, an input feedback module, a first switch and a second switch; the first output end of the main control module is connected with the first input end of the signal module, and the second output end of the main control module is connected with the first input end of the input feedback module; the first input end of the main control module is connected with the first output end of the output feedback module, and the second input end of the main control module is connected with the first output end of the input feedback module; a second input end of the signal module is connected with one end of the first switch, and the other end of the first switch is connected with a second output end of the output feedback module; a third input end of the signal module is connected with one end of the second switch, and the other end of the second switch is connected with a second output end of the input feedback module; the output end of the signal module is connected with the input end of the power amplification module; the output end of the power amplification module is connected with the input end of the output feedback module and then is used as the output end of the additional temperature rise calibrating device to output current; and a second input end of the input feedback module is used as an input end of the additional temperature rise calibrating device to input current.
Further, the signal module comprises a signal generating unit and an adder; the input end of the signal generating unit is used as the first input end of the signal module and is connected with the first output end of the main control module, and the output end of the signal generating unit is connected with the first input end of the adder; the second input end of the adder is used as the second input end of the signal module and connected with the first switch, the third input end of the adder is used as the third input end of the signal module and connected with the second switch, and the output end of the adder is used as the output end of the signal module and connected with the input end of the power amplification module.
Further, the output feedback module comprises a first feedback unit and an output sampling unit; the input end of the output sampling unit is used as the input end of the output feedback module and is connected with the output end of the power amplification module, the first output end is used as the first output end of the output feedback module and is connected with the first input end of the main control module, and the second output end is connected with the input end of the first feedback unit; and the output end of the first feedback unit is used as a second output end of the output feedback module and is connected with the first switch.
Further, the input feedback module comprises a second feedback unit and an input sampling unit; the input end of the input sampling unit is used as a second input end of the input feedback module to input current, the first output end of the input sampling unit is used as a first output end of the input feedback module to be connected with the second input end of the main control module, and the second output end of the input sampling unit is connected with the second input end of the second feedback unit; and a first input end of the second feedback unit is used as a first input end of the input feedback module and connected with a second output end of the main control module, and an output end of the second feedback unit is used as a second output end of the input feedback module and connected with the second switch.
An additional temperature rise calibrating method of a transformer winding temperature controller is applied to an additional temperature rise calibrating device of the transformer winding temperature controller, and comprises the following steps:
the method comprises the following steps: connecting a connecting line of the additional temperature rise calibrating device and the converter;
step two: the second switch of the additional temperature rise calibrating device is opened, and the first switch is closed;
step three: carrying out the detection of the transformation ratio and the linearity of the input current and the output current of the converter;
step four: the first switch of the additional temperature rise calibrating device is opened, and the second switch is closed;
step five: an additional temperature rise assay was performed.
Furthermore, the connection of the additional temperature rise calibrating device and the converter means that the output end of the additional temperature rise calibrating device is connected with the input end of the converter, and the input end of the additional temperature rise calibrating device is connected with the output end of the converter.
Furthermore, the verification of the transformation ratio and the linearity of the input current and the output current of the converter means that a first feedback unit connected to an adder plays a negative feedback role, the power amplification module is controlled to accurately and stably output the current, and the transformation ratio and the linearity of the converter can be accurately verified by sampling the input current and the output current of the converter.
Further, the additional temperature rise verification is that the current value output by the converter is input to the main control module, the main control module outputs current to the signal module according to the converter transformation ratio to generate a control instruction, and meanwhile, a feedback coefficient of the second feedback unit is set; and after the second feedback unit operates according to the sampled current data and the feedback coefficient, the second feedback unit feeds back information to the adder to control the current output by the converter to keep accurate and stable so as to measure and calculate the additional temperature rise generated by the current output by the converter.
The invention provides an additional temperature rise calibrating device and method of a transformer winding temperature controller, wherein the device comprises a main control module, a signal module and a power amplification module, the current input into a converter can be set according to requirements, an output feedback module is arranged at the output end of the device to sample and stably control the current input into the converter, and the input feedback module is arranged at the input end of the device to sample and stably control the current output by the converter. The method comprises the steps of stably controlling the current input into the converter through an output feedback module of the device, measuring the current output by the converter and calculating the transformation ratio of the converter, further setting the output current of the converter and the feedback coefficient of the input feedback module according to the transformation ratio of the converter, accurately and stably controlling the current output by the converter through the input feedback module, and conveniently measuring the temperature rise of accessories generated by the output current of the converter.
Drawings
FIG. 1 is a schematic diagram of an additional temperature rise calibrating apparatus for a transformer winding temperature controller;
fig. 2 is a flow chart of an additional temperature rise verification method for a transformer winding temperature controller.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
Fig. 1 is a schematic structural diagram of an additional temperature rise calibrating apparatus for a transformer winding temperature controller, wherein the apparatus includes a main control module, a signal module, a power amplification module, an output feedback module and an input feedback module. The main control module is used for processing current sampling information and outputting current to generate a control command, the signal module is used for producing a required current waveform according to the received control command and input current feedback information, the power amplification module is used for amplifying the input current waveform and outputting the amplified current waveform to the converter, the output feedback module is used for sampling current information output by the calibrating device and feeding the current information back to the main control module and the signal module, and the input feedback module is used for sampling current information input by the calibrating device and feeding the current information back to the main control module and the signal module.
The first output end of the main control module is connected with the first input end of the signal module so as to output a current to generate a control instruction to the signal module; the second output end of the main control module is connected with the first input end of the input feedback module so as to set the feedback coefficient of the input feedback module. The first input end of the main control module is connected with the first output end of the output feedback module so as to receive the output current information of the calibrating device sampled by the output feedback module; the second input end of the main control module is connected with the first output end of the input feedback module so as to receive the input current information of the calibrating device sampled by the input feedback module. The second input end of the signal module is connected with one end of the first switch, and the other end of the first switch is connected with the second output end of the output feedback module, so that whether the signal module is connected to the output feedback module or not is controlled by closing the first switch; the third input end of the signal module is connected with one end of the second switch, and the other end of the second switch is connected with the second output end of the input feedback module, so that whether the signal module is connected to the input feedback module or not is controlled by closing the second switch; the output end of the signal module is connected with the input end of the power amplification module, and the required current waveform is output to the power amplification module. The output end of the power amplification module is used as the output end of the calibrating device and is connected with the input end of the converter, and the current waveform output by the signal module is amplified and then output to the converter. The input end of the output feedback module is connected with the output end of the power amplification module so as to sample and detect the current information output by the calibrating device, and the second input end of the input feedback module is connected with the output end of the converter as the input end of the additional temperature rise calibrating device so as to sample and detect the current information input by the calibrating device.
In specific implementation, the signal module comprises a signal generating unit and an adder, wherein the input end of the signal generating unit is used as the first input end of the signal module and is connected with the first output end of the main control module, and the output end of the signal generating unit is connected with the first input end of the adder; the second input end of the adder is used as the second input end of the signal module and connected with the first switch, the third input end of the adder is used as the third input end of the signal module and connected with the second switch, and the output end of the adder is used as the output end of the signal module and connected with the input end of the power amplification module.
In specific implementation, the output feedback module comprises a first feedback unit and an output sampling unit, an input end of the output sampling unit is connected with an output end of the power amplification module as an input end of the output feedback module, a first output end of the output sampling unit is connected with a first input end of the main control module as a first output end of the output feedback module, a second output end of the output sampling unit is connected with an input end of the first feedback unit, and an output end of the first feedback unit is connected with the first switch as a second output end of the output feedback module.
In specific implementation, the input feedback module comprises a second feedback unit and an input sampling unit, the input end of the input sampling unit is connected with the input end of the converter as the second input end of the input feedback module, the first output end of the input sampling unit is connected with the second input end of the main control module as the first output end of the input feedback module, the second output end of the input sampling unit is connected with the second input end of the second feedback unit, the first input end of the second feedback unit is connected with the second output end of the main control module as the first input end of the input feedback module, and the output end of the second feedback unit is connected with the second switch as the second output end of the input feedback module.
Example two
An additional temperature rise calibrating method of a transformer winding temperature controller is applied to an additional temperature rise calibrating device of the transformer winding temperature controller, and specifically comprises the following steps:
the method comprises the following steps: connecting a connecting line of the additional temperature rise calibrating device and the converter;
step two: opening the second switch and closing the first switch;
step three: carrying out transformer ratio verification on input and output currents of the converter;
step four: opening the first switch and closing the second switch;
step five: an additional temperature rise assay was performed.
In a specific implementation, the connection between the additional temperature rise calibrating device and the converter means that the output end of the additional temperature rise calibrating device is connected with the input end of the converter, and the input end of the additional temperature rise calibrating device is connected with the output end of the converter.
In specific implementation, the step of calibrating the transformation ratio of the input current and the output current of the converter means that the adder is connected to the first feedback unit to play a negative feedback role at the moment, so that the power amplification module can accurately and stably output the current, and the transformation ratio and the linearity of the converter can be accurately calibrated by sampling the input current and the output current of the converter.
In specific implementation, the performing of the additional temperature rise verification means inputting a current value to be output by the converter on the main control module, setting a feedback coefficient of the second feedback unit by the main control module according to a converter transformation ratio, and outputting a current to the signal module to generate a control instruction; at the moment, the adder is connected to the second feedback unit, the second feedback unit outputs a feedback signal to the adder after calculating according to the sampled current information output by the converter and the feedback coefficient set by the main control module, so that the current output by the converter is controlled to be accurate and stable for a long time, and the additional temperature rise generated by the current output by the converter is conveniently measured.
The invention provides an additional temperature rise calibrating device and method of a transformer winding temperature controller, wherein the calibrating device comprises a main control module, a signal module and a power amplification module, the current input into a converter can be set according to requirements, meanwhile, the current input into the converter is sampled and stably controlled by arranging an output feedback module at the output end of the calibrating device, and the current input into the converter is sampled and stably controlled by arranging an input feedback module at the input end of the calibrating device. The method comprises the steps of stably controlling the current input into the converter through an output feedback module of the calibrating device, measuring the current output by the converter and calculating the transformation ratio of the converter, setting the feedback coefficient of the input feedback module of the calibrating device according to the transformation ratio of the converter, and accurately and stably controlling the current output by the converter through the input feedback module, so that the temperature rise of accessories generated by the output current of the converter can be conveniently measured.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (8)
1. An additional temperature rise calibrating device of a transformer winding temperature controller is characterized by comprising a main control module, a signal module, a power amplification module, an output feedback module, an input feedback module, a first switch and a second switch; the first output end of the main control module is connected with the first input end of the signal module, and the second output end of the main control module is connected with the first input end of the input feedback module; the first input end of the main control module is connected with the first output end of the output feedback module, and the second input end of the main control module is connected with the first output end of the input feedback module; a second input end of the signal module is connected with one end of the first switch, and the other end of the first switch is connected with a second output end of the output feedback module; a third input end of the signal module is connected with one end of the second switch, and the other end of the second switch is connected with a second output end of the input feedback module; the output end of the signal module is connected with the input end of the power amplification module; the output end of the power amplification module is connected with the input end of the output feedback module and then is used as the output end of the additional temperature rise calibrating device to output current; and a second input end of the input feedback module is used as an input end of the additional temperature rise calibrating device to input current.
2. The additional temperature rise verification device of the transformer winding temperature controller according to claim 1, wherein the signal module comprises a signal generation unit and an adder; the input end of the signal generating unit is used as the first input end of the signal module and is connected with the first output end of the main control module, and the output end of the signal generating unit is connected with the first input end of the adder; the second input end of the adder is used as the second input end of the signal module and connected with the first switch, the third input end of the adder is used as the third input end of the signal module and connected with the second switch, and the output end of the adder is used as the output end of the signal module and connected with the input end of the power amplification module.
3. The additional temperature rise verification device of the transformer winding temperature controller according to claim 1, wherein the output feedback module comprises a first feedback unit and an output sampling unit; the input end of the output sampling unit is used as the input end of the output feedback module and is connected with the output end of the power amplification module, the first output end is used as the first output end of the output feedback module and is connected with the first input end of the main control module, and the second output end is connected with the input end of the first feedback unit; and the output end of the first feedback unit is used as a second output end of the output feedback module and is connected with the first switch.
4. The additional temperature rise verification device of the transformer winding temperature controller according to any one of claims 1 to 3, wherein the input feedback module comprises a second feedback unit and an input sampling unit; the input end of the input sampling unit is used as a second input end of the input feedback module to input current, the first output end of the input sampling unit is used as a first output end of the input feedback module to be connected with the second input end of the main control module, and the second output end of the input sampling unit is connected with the second input end of the second feedback unit; and a first input end of the second feedback unit is used as a first input end of the input feedback module and connected with a second output end of the main control module, and an output end of the second feedback unit is used as a second output end of the input feedback module and connected with the second switch.
5. An additional temperature rise verification method of a transformer winding temperature controller is characterized in that the additional temperature rise verification method is applied to the additional temperature rise verification device of the transformer winding temperature controller according to any one of claims 1 to 4, and comprises the following steps:
connecting a connecting line of an additional temperature rise calibrating device and a current transformer;
step two, opening a second switch of the additional temperature rise calibrating device and closing a first switch;
step three, carrying out transformer ratio and linearity verification of input and output currents of the converter;
step four, the first switch of the additional temperature rise calibrating device is switched off, and the second switch is switched on;
step five: an additional temperature rise assay was performed.
6. The method of claim 5, wherein the connecting the additional temperature rise calibrating device to the converter means connecting an output terminal of the additional temperature rise calibrating device to an input terminal of the converter and connecting an input terminal of the additional temperature rise calibrating device to an output terminal of the converter.
7. The method for calibrating the additional temperature rise of the transformer winding temperature controller according to claim 5, wherein the calibration of the transformation ratio and the linearity of the input and output currents of the converter means that the first feedback unit connected to the adder performs negative feedback to control the power amplification module to accurately stabilize the output current, and the transformation ratio and the linearity of the converter are accurately calibrated by sampling the input and output currents of the converter.
8. The method for calibrating the additional temperature rise of the transformer winding temperature controller according to claim 5, wherein the additional temperature rise calibration is performed by inputting a current value output by the converter to the main control module, and the main control module outputs a control command to the signal module according to the transformation ratio of the converter and sets a feedback coefficient of the second feedback unit; and after the second feedback unit operates according to the sampled current data and the feedback coefficient, the second feedback unit feeds back information to the adder to control the current output by the converter to keep accurate and stable so as to measure and calculate the additional temperature rise generated by the current output by the converter.
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