CN107179141B - Oil-immersed power transformation equipment temperature measuring device with online calibration function and calibration method - Google Patents
Oil-immersed power transformation equipment temperature measuring device with online calibration function and calibration method Download PDFInfo
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Abstract
The invention discloses an oil-immersed power transformation equipment temperature measuring device with an online calibration function, which comprises: a composite temperature sensor unit comprising: the temperature bulb and the temperature measuring element are used for respectively measuring the working temperature of the oil-immersed power transformation equipment; the thermometer bulb is connected with the pointer display and control unit, and the temperature measuring element is connected with the online calibration unit; the pointer display and control unit is used for displaying the working temperature of the oil-immersed power transformation equipment measured by the thermal bulb in a pointer mode, and the displayed temperature value is a first temperature value; and the online calibration unit is used for online calibrating the second temperature value measured by the temperature measuring element to obtain the calibrated output temperature. The invention has the beneficial effects that: the online calibration of the temperature measuring device of the oil-immersed power transformation equipment in the uninterrupted state is realized, the two-meter deviation fault of the temperature measuring device for the oil-immersed power transformation equipment is eliminated, and the online calibration method has important significance for guaranteeing the safe and stable operation of the oil-immersed power transformation equipment.
Description
Technical Field
The invention relates to the field of calibration of temperature measuring devices of power transformation equipment, in particular to an oil-immersed power transformation equipment temperature measuring device with an online calibration function and a calibration method.
Background
The oil-immersed power transformation equipment is core equipment of a power grid and comprises a transformer, a high-impedance transformer, a converter transformer and the like. When the oil-immersed power transformation equipment normally operates, certain temperature field distribution can be presented due to winding current heating and insulating oil flowing. The temperature measuring device monitors the internal temperature of the oil-immersed power transformation equipment in real time by monitoring the top layer oil temperature of the oil-immersed power transformation equipment and the hot spot temperature under different load currents, and provides real-time early warning and protection. When the inside overheat or other electricity, hot trouble that takes place of oil-immersed substation equipment, lead to inside temperature to obviously rise, temperature measuring device's dial plate pointer stirs inside micro-gap switch under the condition that the temperature rises this moment, realizes oil-immersed substation equipment's operation trouble and reports to the police and the protection action to owing to be the advantage of pure mechanical type operation, can effectively avoid the forceful electric magnetism in the transformer substation to disturb the problem, have very high operational reliability. Therefore, the temperature measuring device has important significance for fault early warning of the oil-immersed power transformation equipment, guaranteeing safe operation of the equipment and preventing further development of equipment faults.
In order to remotely monitor the internal temperature of the temperature measuring device for the oil-immersed power transformation equipment, the temperature measuring device can remotely transmit a digital signal of the temperature to a control room (remote) of the transformer substation for real-time display. However, a closed system formed by a temperature bulb, an elastic element and a capillary tube of the temperature measuring device inevitably has chronic leakage, and meanwhile, the temperature sensing element in the closed system of the temperature measuring device is influenced by the change of the ambient temperature, so that the faults of two-meter deviation exist between the local pointer indication temperature (the display temperature of the meter 1) of the temperature measuring device for the oil-immersed power transformation equipment and the digital display temperature (the display temperature of the meter 2) of a remote substation control room. In addition, the capillary tube in the wiring groove of the temperature measuring device for the oil-immersed power transformation equipment can be subjected to high temperature of more than 60 ℃ under the insolation of high temperature of insulating oil and sunshine in summer, the 'two-meter deviation' of the temperature measuring device can be caused to reach more than 5K, and false alarm of a protection system in a transformer substation is easily caused. The field statistical result of the defects of the temperature measuring device for the oil-immersed power transformation equipment of the transformer substation shows that the two-meter deviation fault accounts for more than 50% of the defects of the temperature measuring device, and the safe and stable operation of the oil-immersed power transformation equipment is seriously influenced.
Therefore, the elimination of the 'two-meter deviation' fault becomes the most important work for the operation and maintenance of the temperature measuring device for the oil-immersed power transformation equipment. Theoretically, the temperature measuring device with the two-meter deviation fault can be calibrated offline according to the specification of the power industry standard DL/T1400-2015, but the calibration cannot be completed because the substation does not have the power failure condition, so that the two-meter deviation fault always exists.
Disclosure of Invention
The invention provides an oil-immersed power transformation equipment temperature measuring device with an online calibration function and a calibration method, and aims to solve the problem that the online calibration of the oil-immersed power transformation equipment temperature measuring device is difficult to realize in a non-power-off state of a transformer substation.
In order to solve the above problem, according to an aspect of the present invention, there is provided an oil-immersed power transformation device temperature measurement apparatus having an online calibration function, the system including: a composite temperature sensor unit, a pointer display and control unit and an online calibration unit,
the compound temperature sensor unit is connected with the pointer display and control unit and the online calibration unit respectively, and comprises: the temperature bulb and the temperature measuring element are used for respectively measuring the working temperature of the oil-immersed power transformation equipment; the thermometer bulb is connected with the pointer display and control unit, and the temperature measuring element is connected with the online calibration unit;
the pointer display and control unit is used for displaying the working temperature of the oil-immersed power transformation equipment measured by the thermal bulb in a pointer mode, and the displayed temperature value is a first temperature value; and
and the online calibration unit is used for online calibrating the second temperature value measured by the temperature measuring element to obtain the calibrated output temperature.
Preferably, the temperature measuring element is independently installed, or the temperature measuring element and the thermal bulb are installed together.
Preferably, wherein the pointer display and control unit comprises: capillary, elastic element, pointer, dial, shift fork and control component,
the capillary tube is respectively connected with the thermal bulb and the elastic element to jointly form a closed system, a tank-filled temperature sensing medium is filled in the closed system, and the temperature sensing medium expands with heat and contracts with cold according to the measured temperature of the thermal bulb to generate pressure and act on the elastic element; wherein, the capillary tube is a soft-tire metal tube with a micropore inner cavity; the elastic element adopts a pressure sensitive element with a double-layer edge welded multi-turn Bowden tube, the shape of the pressure sensitive element changes along with the pressure change in an elastic deformation range, one end of the pressure sensitive element is fixed, and the other end of the pressure sensitive element generates displacement due to internal pressure change;
the pointer is connected with the movable end of the elastic element and used for indicating and displaying on the local dial according to the first measured temperature value;
the shifting fork is rigidly connected with the movable end of the elastic element and is used for generating synchronous displacement with the movable end of the elastic element and changing the state of the control part;
the control component is used for outputting a control signal.
Preferably, wherein the system further comprises:
and the online calibration terminal is connected with the online calibration unit and used for sending an online calibration command to the online calibration unit.
Preferably, wherein the online calibration unit comprises: an analog-to-digital conversion module, a time management module, an ambient temperature monitoring module, an intelligent calibration module, an internal storage module, a wireless communication module and a temperature output module,
the analog-to-digital conversion module is respectively connected with the temperature measuring element, the intelligent calibration module and the temperature output module, and is used for converting a temperature analog signal corresponding to the working temperature of the oil-immersed power transformation device measured by the temperature measuring element into a temperature digital signal, acquiring a second temperature value and sending the second temperature value to the intelligent calibration module and the temperature output module;
the time management module is respectively connected with the wireless communication module and the intelligent calibration module, and is used for carrying out time calibration and sending the calibrated time to the intelligent calibration module;
the environment temperature monitoring module is connected with the intelligent calibration module and used for monitoring the environment temperature at the position of the pointer display and control unit, acquiring an environment monitoring temperature value and sending the environment monitoring temperature value to the intelligent calibration module;
the intelligent calibration module is respectively connected with the internal storage module and the temperature output module, and is used for carrying out online calibration on the second temperature value by using the environment monitoring temperature value and the first temperature value, acquiring a calibrated output temperature, and respectively sending the calibrated output temperature to the internal storage module and the temperature output module;
the internal storage module is connected with the intelligent calibration module and is used for storing the calibrated output temperature and related information;
the wireless communication module is respectively connected with the online calibration terminal and the internal storage module, and is used for receiving an online calibration command sent by the online calibration terminal and respectively sending the online calibration command to the internal storage module, the time management module and the intelligent calibration module;
and the temperature output module is used for outputting the calibrated output temperature.
According to another aspect of the present invention, there is provided a method of online calibration, the method comprising:
measuring the working temperature of the oil-immersed power transformation equipment; the working temperature of the power transformation equipment is measured by using a temperature bulb and a temperature measuring element respectively;
displaying the working temperature of the oil-immersed power transformation equipment measured by the thermal bulb in a pointer mode to obtain a first temperature value;
performing analog-to-digital conversion on the working temperature of the oil-immersed power transformation equipment measured by the temperature measuring element to obtain a second temperature value;
monitoring the environmental temperature at the position of the pointer to obtain an environmental monitoring temperature value; and
and performing online calibration on the second temperature value by using the first temperature value and the environment monitoring temperature value to obtain the calibrated output temperature.
Preferably, the temperature measuring element is independently installed, or the temperature measuring element and the thermal bulb are installed together.
Preferably, the online calibrating the second temperature value by using the first temperature value and the environmental monitoring temperature value to obtain the calibrated output temperature includes:
adjusting preset basic parameter data according to the recorded basic information of the temperature measuring device to obtain basic parameter data for calibration, wherein the basic parameter data for calibration comprises: model, number, measurement range or accuracy level;
automatically generating calibration parameter array separation points according to the calibration basic parameter data, wherein the separation points comprise: each temperature check point i of the segments within the measuring range at specified intervals and an environment temperature check point j of the segments within the environment temperature range at specified intervals;
calculating a calibration parameter matrix [ T (i, j) according to the calibration basic parameter data and the calibration parameter array separation points]N×MWherein N is the total number of the temperature check points i, and M is the total number of the environment temperature check points j;
determining corresponding j and i according to the environment monitoring temperature value and the second temperature value respectively;
selecting relevant parameter elements T (i, j), T (i +1, j), T (i, j +1) and T (i +1, j +1) from the calibration parameter matrix according to the corresponding j and i, and calculating a corresponding calibration value T (i, j +1) according to an interpolation methodb(i,j)；
And calculating the sum of the second temperature value and the calibration value, acquiring output temperature and finishing online calibration.
Preferably, wherein said calibration parameter matrix [ T (i, j)]N×MThe calculation formula of the calibration parameter T (i, j) is:
T(i,j)＝(T1(i,j)+T2(i,j))-(t1(i,j)+t2(i,j)+t3(i,j))，
wherein, t1(i, j) is the indicating value error of the temperature measuring element, the parameter is not influenced by the environmental temperature, the value is random, and the basic parameter data for calibration are all 0;
t2(i, j) is the output error of the temperature measuring element, the parameter is not influenced by the environmental temperature, the value is random, and the basic parameter data for calibration are all 0;
t3(i, j) is the ambient temperature influence of the temperature measuring element, the parameter is not influenced by the measuring range, and the basic parameter data in calibration is TjRelated empirical formula, where tjThe jth environmental temperature value segmented according to the specified interval in the environmental temperature range is used by the temperature measuring device;
T1(i, j) is a value indicating error displayed by a pointer, the parameter is not influenced by the ambient temperature, the value is random, and basic parameter data for calibration are all 0;
T2(i, j) is the ambient temperature influence quantity displayed by the pointer, the parameter is not influenced by the measuring range, the basic parameter data for calibration is tjAnd the empirical formula is related to the type of the temperature measuring device for the oil-immersed power transformation equipment.
Preferably, wherein the method further comprises: and manually inputting calibration parameters of any point by an online calibration terminal to replace the calculated calibration parameters.
Preferably, wherein the method further comprises:
difference T between output temperature and pointer display temperature after on-line calibrationLAnd when the data are still larger than the preset threshold value, correcting the preset basic parameter data, wherein the preset threshold value is 2.
Preferably, the modifying the preset basic parameter data comprises:
step 2, determining a value of a check point j according to the environment monitoring value, and determining a value of a check point i according to the output temperature;
step 3, extracting the associated calibration parameters T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1) according to the i value and the j value, and calculating the current calibration parameter T according to an interpolation methodb' and extracting associated preset basic parameter data;
step 4, adjusting the third-level basic parameter data in the associated preset parameter data to the limit value of each preset parameter, calculating the adjusted calibration parameters T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1), and calculating the calibration parameter T according to an interpolation methodB′；
Step 5, calculating the calibration parameter TB' and TbDifference of' and TL-a size relationship of 1, and,
if TB′-Tb′≥TL-1, ratio (T)L-2/TB′-Tb') correcting the third-stage basic parameter data to obtain two tables with the deviation of 1 ℃, and storing the data to quit correction;
if TB′-Tb′＜TL-1, adjusting the third level basic parameter data to limit value save data;
step 6, correcting the second-stage basic parameter data according to the calculation principle of the step 4 and the step 5, and if the deviation of the two tables is 1 ℃ after correction, storing the data and quitting the correction; otherwise, go to step 7;
step 7, correcting the first-stage basic parameter data according to the calculation principle of the step 4 and the step 5, and if the deviation of the two tables is 1 ℃ after correction, storing the data and quitting the correction; otherwise, the data is saved and a warning is sent to the online calibration terminal.
The invention has the beneficial effects that:
according to the technical scheme, the temperature measuring device for the oil-immersed power transformation equipment with the online calibration function is provided, the online calibration of the temperature measuring device is carried out in the non-power-outage state of the oil-immersed power transformation equipment through the wireless communication between the online calibration terminal equipment and the temperature measuring device, the two-meter deviation fault of the temperature measuring device for the oil-immersed power transformation equipment is eliminated, and the temperature measuring device for the oil-immersed power transformation equipment has important significance for guaranteeing the safe and stable operation of the oil-immersed power transformation equipment.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic structural diagram of an oil-immersed power transformation equipment temperature measurement device 100 with an online calibration function according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an oil-immersed power transformation equipment temperature measuring device with an online calibration function according to an embodiment of the invention;
FIG. 3 is a flow chart of an online calibration method 300 according to an embodiment of the invention;
FIG. 4 is a flowchart of a method 400 for online calibrating a second temperature value to obtain a calibrated output temperature according to an embodiment of the present invention; and
fig. 5 is a flow chart of a method 400 of modifying pre-set base parameter data according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic structural diagram of an oil-immersed power transformation equipment temperature measurement device 100 with an online calibration function according to an embodiment of the present invention. As shown in fig. 1, the temperature measuring device of oil-immersed power transformation equipment with online calibration function includes: a composite temperature sensor unit 101, a pointer display and control unit 102 and an online calibration unit 103. Preferably, the composite temperature sensor unit is respectively connected to the pointer display and control unit and the online calibration unit, and includes: the temperature bulb and the temperature measuring element are used for respectively measuring the working temperature of the oil-immersed power transformation equipment; the thermometer bulb is connected with the pointer display and control unit, and the temperature measuring element is connected with the online calibration unit. Preferably, the temperature measuring element is independently installed, or the temperature measuring element and the thermal bulb are installed together.
Preferably, the pointer display and control unit 102 is configured to display the operating temperature of the oil-immersed power transformation device measured by the thermal bulb in a pointer manner, where the displayed temperature value is a first temperature value. Preferably, wherein the pointer display and control unit comprises: capillary, elastic element, pointer, dial, shift fork and control component,
the capillary tube is respectively connected with the thermal bulb and the elastic element to jointly form a closed system, a tank-filled temperature sensing medium is filled in the closed system, and the temperature sensing medium expands with heat and contracts with cold according to the measured temperature of the thermal bulb to generate pressure and act on the elastic element; wherein, the capillary tube is a soft-tire metal tube with a micropore inner cavity; the elastic element adopts a pressure sensitive element with a double-layer edge welded multi-turn Bowden tube, the shape of the pressure sensitive element changes along with the pressure change in an elastic deformation range, one end of the pressure sensitive element is fixed, and the other end of the pressure sensitive element generates displacement due to internal pressure change;
the pointer is connected with the movable end of the elastic element and used for indicating and displaying on the local dial according to the first measured temperature value;
the shifting fork is rigidly connected with the movable end of the elastic element and is used for generating synchronous displacement with the movable end of the elastic element and changing the state of the control part;
the control component is used for outputting a control signal.
Preferably, the online calibration unit 103 is configured to perform online calibration on the second temperature value measured by the temperature measuring element, and obtain a calibrated output temperature.
Preferably, wherein the online calibration unit comprises: an analog-to-digital conversion module 1031, a time management module 1032, an ambient temperature monitoring module 1033, an intelligent calibration module 1034, an internal storage module 1035, a wireless communication module 1036, and a temperature output module 1037.
Preferably, the analog-to-digital conversion module 1031 is connected to the temperature measuring element, the intelligent calibration module and the temperature output module, respectively, and is configured to convert a temperature analog signal corresponding to the operating temperature of the oil-immersed power transformation apparatus measured by the temperature measuring element into a temperature digital signal, obtain a second temperature value, and send the second temperature value to the intelligent calibration module and the temperature output module.
Preferably, the time management module 1032 is connected to the wireless communication module and the intelligent calibration module, respectively, and is configured to perform time calibration and send the calibrated time to the intelligent calibration module.
Preferably, the ambient temperature monitoring module 1033 is connected to the intelligent calibration module, and is configured to monitor an ambient temperature at a position where the pointer display and control unit is located, obtain an ambient monitoring temperature value, and send the ambient monitoring temperature value to the intelligent calibration module.
Preferably, the intelligent calibration module 1034 is connected to the internal storage module and the temperature output module, and configured to perform online calibration on the second temperature value by using the environment monitoring temperature value and the first temperature value, obtain a calibrated output temperature, and send the calibrated output temperature to the internal storage module and the temperature output module, respectively.
Preferably, the internal storage module 1035 is connected to the smart calibration module, and is configured to store the calibrated output temperature and related information.
Preferably, the wireless communication module 1036 is connected to the online calibration terminal and the internal storage module, and configured to receive an online calibration command sent by the online calibration terminal, and send the online calibration command to the internal storage module, the time management module, and the intelligent calibration module, respectively.
Preferably, the temperature output module 1037 is configured to output the calibrated output temperature.
Preferably, wherein the system further comprises:
and the online calibration terminal is connected with the online calibration unit and used for sending an online calibration command to the online calibration unit.
Fig. 2 is a schematic diagram of an oil-immersed power transformation equipment temperature measurement device with an online calibration function according to an embodiment of the invention. As shown in fig. 2, includes: the temperature measurement system comprises a 1-composite temperature sensor, a 2-pointer display and control part and a 3-online calibration and remote transmission part, wherein the 1-composite temperature sensor consists of a thermal bulb (1) and a temperature measurement element (8), and the temperature measurement element (8) can be independently installed or can be installed together with the thermal bulb (1) to form a composite sensor.
The 2-pointer display and control part consists of a capillary tube (2), an elastic element (3), a pointer (4), a dial (5), a shifting fork (6) and a control part (7). The temperature bulb (1) in the 1-composite temperature sensor, the capillary tube (2) of the 2-pointer display and control part and the elastic element (3) form a closed system, a temperature sensing medium (liquid or gas) is filled in the closed system, and when the temperature bulb senses the change of the measured temperature, the temperature sensing medium in the closed system expands with heat and contracts with cold, and pressure variables are generated. The capillary tube (2) of the 2-pointer display and control part is composed of a soft metal tube with a micropore (smaller than 0.5mm) inner cavity, and mainly functions to transmit pressure variable inside the thermal bulb to the elastic element (3) of the 2-temperature measuring device pointer display and control part. The elastic element (3) of the 2-pointer display and control part is a pressure sensitive element adopting a double-layer edge welded multi-turn Bowden tube, the shape of the pressure sensitive element changes along with the pressure change in an elastic deformation range, one end of the pressure sensitive element is fixed, and the other end of the pressure sensitive element generates displacement due to internal pressure change. The elastic element of the double-layer edge welding multi-turn Bowden tube is adopted, so that the volume of the inner cavity can be reduced, and the influence quantity of the ambient temperature of the pointer thermometer can be reduced. The pointer (4) of the 2-pointer display and control part is used for locally indicating a measured temperature indicating value, is rigidly connected to the moving end of the elastic element (3) of the 2-pointer display and control part, generates synchronous displacement along with the moving end of the elastic element (3), rotates on the dial (5) of the 2-pointer display and control part, and indicates a measured temperature value. The 2-pointer display and control part is characterized in that a shifting fork (6) is rigidly connected with a moving end of an elastic element (3), and synchronously displaces along with the moving end of the elastic element (3), and the state of a control part (7) is changed, so that the control part (7) outputs different control signals to a protection system (18) of the power transformation equipment to control the start and stop of protection devices for cooling, alarming, tripping and the like of the oil-immersed power transformation equipment. The 3-online calibration and remote transmission part is composed of an analog-to-digital conversion module (9), a time management module (10), an ambient temperature monitoring module (11), an intelligent calibration module (12), an internal storage module (13), a wireless communication module (14) and a temperature output module (15). The temperature measuring element (8) in the 1-composite temperature sensor measures the temperature of the measured object and outputs an analog signal to the analog-to-digital conversion module (9) of the 3-online calibration and remote transmission part, and the analog signal is converted into a digital quantity through the analog-to-digital conversion module (9) and is output to the intelligent calibration module (12). The wireless communication module (14) of the 3-online calibration and remote transmission part is arranged at a wireless transmitting terminal in the temperature measuring device, is connected with an online calibration terminal (16) by adopting an IEEE802.11 series protocol, can receive a calibration instruction sent by the online calibration terminal, stores the calibration instruction into an internal storage module (13) of the 3-online calibration and remote transmission part, and simultaneously outputs the calibration instruction to an intelligent calibration module (12) of the 3-online calibration and remote transmission part. The time management module (10) of the 3-online calibration and remote transmission part is an automatic clock installed in the temperature measuring device, can automatically perform time calibration when being connected with an online calibration terminal (16), and outputs time digital quantity to the intelligent calibration module (12) of the 3-online calibration and remote transmission part. And the environment temperature monitoring module (11) of the 3-online calibration and remote transmission part measures the environment temperature at the installation position of the pointer of the temperature measuring device through an environment temperature sensor arranged in the temperature measuring device, and outputs environment temperature digital quantity to the intelligent calibration module (12) of the 3-online calibration and remote transmission part. The intelligent calibration module (12) of the 3-online calibration and remote transmission part can perform intelligent operation according to digital quantities provided by the time management module (10), the ambient temperature monitoring module (11), the temperature measuring element (8) and the analog-to-digital conversion module (9), so that online calibration of the temperature measuring device for the oil-immersed power transformation equipment is completed. The intelligent calibration module (12) of the 3-online calibration and remote transmission part can intelligently calculate the digital signal quantity provided by the command and time management module (10), the ambient temperature monitoring module (11), the temperature measuring element (8) and the analog-to-digital conversion module (9) which are issued by the online calibration terminal (16) connected with the wireless communication module (14), and complete the online manual calibration of the temperature measuring device for the oil-immersed power transformation equipment. The intelligent operation result and related information of the on-line manual calibration of the intelligent calibration module (12) of the 3-on-line calibration and remote transmission part are stored in the internal storage module (13) for the next on-line calibration. The calibration result of the intelligent calibration module (12) of the 3-online calibration and remote transmission part and the temperature digital quantity signal of the temperature measuring element (8) in the 1-composite temperature sensor are output to the temperature output module (15), and the temperature output module (15) outputs the calibrated temperature signal to a remote place for display.
FIG. 3 is a flow chart of an online calibration method 300 according to an embodiment of the invention. As shown in fig. 3, the online calibration method 300 is used for performing online calibration on an output temperature by using the oil-immersed power transformation equipment temperature measurement device with the online calibration function. The online calibration method 300 starts at step 301, and measures the working temperature of the oil-immersed power transformation device at step 301; the working temperature of the power transformation equipment is measured by the aid of the thermal bulb and the temperature measuring element respectively. Preferably, the temperature measuring element is independently installed, or the temperature measuring element and the thermal bulb are installed together.
Preferably, the operating temperature of the oil-filled power transformation device measured by the thermal bulb is displayed in a pointer form in step 302, and the first temperature value is acquired.
Preferably, in step 303, the working temperature of the oil-immersed power transformation device measured by the temperature measurement element is subjected to analog-to-digital conversion, so as to obtain a second temperature value.
Preferably, the ambient temperature at the pointer location is monitored at step 304 to obtain an ambient monitored temperature value.
Preferably, in step 305, the second temperature value is calibrated online by using the first temperature value and the environmental monitoring temperature value, and a calibrated output temperature is obtained. Fig. 4 is a flowchart of a method 400 for calibrating a second temperature value online to obtain a calibrated output temperature according to an embodiment of the present invention. As shown in fig. 4, the method 400 starts at step 401, and adjusts preset basic parameter data according to the recorded basic information of the thermometric device to obtain basic parameter data for calibration at step 401, where the basic parameter data for calibration includes: model number, measurement range, or accuracy level.
Preferably, in step 402, calibration parameter array separation points are automatically generated according to the calibration basic parameter data, wherein the separation points include: the temperature check points i of the segments at regular intervals in the measuring range and the environment temperature check points j of the segments at regular intervals in the environment temperature range are measured.
Preferably, a calibration parameter matrix [ T (i, j) ] is calculated in step 403 based on the calibration base parameter data and the calibration parameter array separation points]N×MWherein N is the total number of temperature check points i and M is the total number of environment temperature check points j. Preferably, wherein said calibration parameter matrix [ T (i, j)]N×MThe calculation formula of the calibration parameter T (i, j) is:
T(i,j)＝(T1(i,j)+T2(i,j))-(t1(i,j)+t2(i,j)+t3(i,j))，
wherein, t1(i, j) is the indicating value error of the temperature measuring element, the parameter is not influenced by the environmental temperature, the value is random, and the basic parameter data for calibration are all 0;
t2(i, j) is the output error of the temperature measuring element, the parameter is not influenced by the environmental temperature, the value is random, and the basic parameter data for calibration are all 0;
t3(i, j) is the amount of influence of the ambient temperature of the temperature measuring elementThe parameter is not affected by measurement range, and the basic parameter data in calibration is TjRelated empirical formula, where tjThe jth environmental temperature value segmented according to the specified interval in the environmental temperature range is used by the temperature measuring device;
T1(i, j) is a value indicating error displayed by a pointer, the parameter is not influenced by the ambient temperature, the value is random, and basic parameter data for calibration are all 0;
T2(i, j) is the ambient temperature influence quantity displayed by the pointer, the parameter is not influenced by the measuring range, the basic parameter data for calibration is tjAnd the empirical formula is related to the type of the temperature measuring device for the oil-immersed power transformation equipment.
Preferably, corresponding j and i are determined in step 404 based on the environment monitored temperature value and the second temperature value, respectively.
Preferably, in step 405, the associated parameter elements T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1) are selected from the calibration parameter matrix according to the corresponding j and i, and the corresponding calibration value T (i, j +1) is calculated by interpolation methodb(i,j)。
Preferably, the sum of the second temperature value and the calibration value is calculated in step 406, the output temperature is obtained, and the online calibration is completed.
Preferably, wherein the method further comprises: and manually inputting calibration parameters of any point by an online calibration terminal to replace the calculated calibration parameters.
Preferably, wherein the method further comprises:
difference T between output temperature and pointer display temperature after on-line calibrationLAnd when the data are still larger than the preset threshold value, correcting the preset basic parameter data, wherein the preset threshold value is 2.
Fig. 5 is a flow chart of a method 500 for modifying pre-set base parameter data according to an embodiment of the present invention. As shown in FIG. 5, the method 500 is for modifying pre-set base parameter data, the method 500 begins at step 501 by dividing the pre-set base parameter data into first level base parameter data, second level base parameter data, and second level base parameter data at step 501Three-stage basic parameter data, wherein the first-stage basic parameter data is obtained by off-line measurement in a laboratory or a field and is corrected finally in the correcting process; the second-stage basic parameter data is a corrected parameter, and is corrected when the third-stage basic parameter data cannot meet the requirement after being corrected to a limit value; the third-stage basic parameter data is obtained by presetting parameters through the oil-immersed temperature measuring device and is not corrected, and is corrected firstly in the correcting process. Before step 501, the method further includes: a technician accesses the online calibration terminal to the online calibration unit through WiFi; the pointer of the temperature measuring device for the oil-immersed power transformation equipment is input to display the temperature T in real time, and the temperature T output in real time is automatically readBCalculating the deviation T of the two tablesLWhen the deviation T of two tablesLAnd starting a basic parameter correction program when the temperature is higher than 2 ℃.
Preferably, at step 502, a checkpoint j value is determined based on the environmental monitoring value and a checkpoint i value is determined based on the output temperature.
Preferably, in step 503, the associated calibration parameters T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1) are extracted according to the i value and the j value, and the current calibration parameter T (i, j +1) is calculated by interpolationb' and extracts the associated preset basic parameter data.
Preferably, in step 504, the third-level basic parameter data in the associated preset parameter data is adjusted to the limit value of each preset parameter, the adjusted calibration parameters T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1) are calculated, and the calibration parameter T (i, j) is calculated by interpolationB′。
Preferably, step 505, the calibration parameter T is calculatedB' and TbDifference of' and TL-a size relationship of 1, and,
if TB′-Tb′≥TL-1, ratio (T)L-2/TB′-Tb') correcting the third-stage basic parameter data to obtain two tables with the deviation of 1 ℃, and storing the data to quit correction;
if TB′-Tb′＜TL-1, a third stageAnd adjusting the basic parameter data to the limit value to store the data.
Preferably, step 506, according to the calculation principle of step 504 and step 505, correcting the second-level basic parameter data, if the deviation of the two tables is 1 ℃ after correction, saving the data and exiting the correction; otherwise, go to step 507.
Preferably, in step 507, the first-stage basic parameter data is corrected according to the calculation principle of step 504 and step 505, and if the corrected data meets the condition that the deviation between the two tables is 1 ℃, the data is stored and the correction is quit; otherwise, the data is saved and a warning is sent to the online calibration terminal.
The oil-immersed power transformation equipment temperature measurement device 100 with the online calibration function according to the embodiment of the present invention corresponds to the online calibration method 300 according to another embodiment of the present invention, and details thereof are not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (11)
1. The utility model provides an oil-immersed substation equipment temperature measuring device with online calibration function which characterized in that, the device includes: a composite temperature sensor unit, a pointer display and control unit and an online calibration unit,
the compound temperature sensor unit is connected with the pointer display and control unit and the online calibration unit respectively, and comprises: the temperature bulb and the temperature measuring element are used for respectively measuring the working temperature of the oil-immersed power transformation equipment; the thermometer bulb is connected with the pointer display and control unit, and the temperature measuring element is connected with the online calibration unit;
the pointer display and control unit is used for displaying the working temperature of the oil-immersed power transformation equipment measured by the thermal bulb in a pointer mode, and the displayed temperature value is a first temperature value;
the online calibration unit is used for online calibrating the second temperature value measured by the temperature measuring element to obtain the calibrated output temperature;
wherein the online calibration unit comprises: the system comprises an ambient temperature monitoring module and an intelligent calibration module;
the environment temperature monitoring module is connected with the intelligent calibration module and used for monitoring the environment temperature at the position of the pointer display and control unit, acquiring an environment monitoring temperature value and sending the environment monitoring temperature value to the intelligent calibration module;
the intelligent calibration module is used for carrying out online calibration on the second temperature value by using the environment monitoring temperature value and the first temperature value to obtain a calibrated output temperature;
the online calibration of the second temperature value by using the first temperature value and the environmental monitoring temperature value to obtain the calibrated output temperature includes:
adjusting preset basic parameter data according to the recorded basic information of the temperature measuring device to obtain basic parameter data for calibration, wherein the basic parameter data for calibration comprises: model, number, measurement range or accuracy level;
automatically generating calibration parameter array separation points according to the calibration basic parameter data, wherein the separation points comprise: each temperature check point i of the segments within the measuring range at specified intervals and an environment temperature check point j of the segments within the environment temperature range at specified intervals;
calculating a calibration parameter matrix [ T (i, j) ] NxM according to the calibration basic parameter data and the calibration parameter array separation points, wherein N is the total number of temperature check points i, and M is the total number of environment temperature check points j;
determining corresponding j and i according to the environment monitoring temperature value and the second temperature value respectively;
selecting relevant parameter elements T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1) from the calibration parameter matrix according to the corresponding j and i, and calculating a corresponding calibration value T (i, j +1) according to an interpolation methodb(i,j)；
And calculating the sum of the second temperature value and the calibration value, acquiring output temperature and finishing online calibration.
2. The apparatus of claim 1, wherein the temperature sensing element is mounted independently or in combination with the bulb.
3. The apparatus of claim 1, wherein the pointer display and control unit comprises: capillary, elastic element, pointer, dial, shift fork and control component,
the capillary tube is respectively connected with the thermal bulb and the elastic element to jointly form a closed system, a tank-filled temperature sensing medium is filled in the closed system, and the temperature sensing medium expands with heat and contracts with cold according to the measured temperature of the thermal bulb to generate pressure and act on the elastic element; wherein, the capillary tube is a soft-tire metal tube with a micropore inner cavity; the elastic element adopts a pressure sensitive element with a double-layer edge welded multi-turn Bowden tube, the shape of the pressure sensitive element changes along with the pressure change in an elastic deformation range, one end of the pressure sensitive element is fixed, and the other end of the pressure sensitive element generates displacement due to internal pressure change;
the pointer is connected with the movable end of the elastic element and used for indicating and displaying on the local dial according to the first temperature value;
the shifting fork is rigidly connected with the movable end of the elastic element and is used for generating synchronous displacement with the movable end of the elastic element and changing the state of the control part;
the control component is used for outputting a control signal.
4. The apparatus of claim 1, further comprising:
and the online calibration terminal is connected with the online calibration unit and used for sending an online calibration command to the online calibration unit.
5. The apparatus of claim 4, wherein the online calibration unit comprises: an analog-to-digital conversion module, a time management module, an internal storage module, a wireless communication module and a temperature output module,
the analog-to-digital conversion module is respectively connected with the temperature measuring element, the intelligent calibration module and the temperature output module, and is used for converting a temperature analog signal corresponding to the working temperature of the oil-immersed power transformation device measured by the temperature measuring element into a temperature digital signal, acquiring a second temperature value and sending the second temperature value to the intelligent calibration module and the temperature output module;
the time management module is respectively connected with the wireless communication module and the intelligent calibration module, and is used for carrying out time calibration and sending the calibrated time to the intelligent calibration module;
the intelligent calibration module is respectively connected with the internal storage module and the temperature output module and is used for respectively sending the calibrated output temperature to the internal storage module and the temperature output module;
the internal storage module is connected with the intelligent calibration module and is used for storing the calibrated output temperature and related information;
the wireless communication module is respectively connected with the online calibration terminal and the internal storage module, and is used for receiving an online calibration command sent by the online calibration terminal and respectively sending the online calibration command to the internal storage module, the time management module and the intelligent calibration module;
and the temperature output module is used for outputting the calibrated output temperature.
6. A method for on-line calibration using the apparatus of claim 1, the method comprising:
measuring the working temperature of the oil-immersed power transformation equipment; the working temperature of the power transformation equipment is measured by using a temperature bulb and a temperature measuring element respectively;
displaying the working temperature of the oil-immersed power transformation equipment measured by the thermal bulb in a pointer mode to obtain a first temperature value;
performing analog-to-digital conversion on the working temperature of the oil-immersed power transformation equipment measured by the temperature measuring element to obtain a second temperature value;
monitoring the environmental temperature at the position of the pointer to obtain an environmental monitoring temperature value; and
carrying out online calibration on the second temperature value by using the first temperature value and the environment monitoring temperature value to obtain a calibrated output temperature;
the online calibration of the second temperature value by using the first temperature value and the environmental monitoring temperature value to obtain the calibrated output temperature includes:
adjusting preset basic parameter data according to the recorded basic information of the temperature measuring device to obtain basic parameter data for calibration, wherein the basic parameter data for calibration comprises: model, number, measurement range or accuracy level;
automatically generating calibration parameter array separation points according to the calibration basic parameter data, wherein the separation points comprise: each temperature check point i of the segments within the measuring range at specified intervals and an environment temperature check point j of the segments within the environment temperature range at specified intervals;
calculating a calibration parameter matrix [ T (i, j) ] NxM according to the calibration basic parameter data and the calibration parameter array separation points, wherein N is the total number of temperature check points i, and M is the total number of environment temperature check points j;
determining corresponding j and i according to the environment monitoring temperature value and the second temperature value respectively;
selecting relevant parameter elements T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1) from the calibration parameter matrix according to the corresponding j and i, and calculating a corresponding calibration value T (i, j +1) according to an interpolation methodb(i,j)；
And calculating the sum of the second temperature value and the calibration value, acquiring output temperature and finishing online calibration.
7. The method of claim 6, wherein the temperature sensing element is mounted independently or in combination with the bulb.
8. The method according to claim 6, characterized in that the calculation formula of the calibration parameters T (i, j) of the calibration parameter matrix [ T (i, j) ] NxM is:
T(i,j)＝(T1(i,j)+T2(i,j))-(t1(i,j)+t2(i,j)+t3(i,j))
wherein, t1(i, j) is the indicating value error of the temperature measuring element, the parameter is not influenced by the environmental temperature, the value is random, and the basic parameter data for calibration are all 0;
t2(i, j) is the output error of the temperature measuring element, the parameter is not influenced by the environmental temperature, the value is random, and the basic parameter data for calibration are all 0;
t3(i, j) is the ambient temperature influence of the temperature measuring element, the parameter is not influenced by the measuring range, and the basic parameter data in calibration is TjRelated empirical formula, where tjThe jth environmental temperature value segmented according to the specified interval in the environmental temperature range is used by the temperature measuring device;
T1(i, j) is a value indicating error displayed by a pointer, the parameter is not influenced by the ambient temperature, the value is random, and basic parameter data for calibration are all 0;
T2(i, j) is the ambient temperature influence quantity displayed by the pointer, the parameter is not influenced by the measuring range, the basic parameter data for calibration is tjAnd the empirical formula is related to the type of the temperature measuring device for the oil-immersed power transformation equipment.
9. The method of claim 8, further comprising: and manually inputting calibration parameters of any point by an online calibration terminal to replace the calculated calibration parameters.
10. The method of claim 6, further comprising:
difference T between output temperature and pointer display temperature after on-line calibrationLAnd when the data are still larger than the preset threshold value, correcting the preset basic parameter data, wherein the preset threshold value is 2.
11. The method of claim 10, wherein said modifying said pre-set base parameter data comprises:
step 1, dividing the preset basic parameter data into first-stage basic parameter data, second-stage basic parameter data and third-stage basic parameter data, wherein the first-stage basic parameter data is obtained by laboratory or field off-line measurement and is corrected finally in the correcting process; the second-stage basic parameter data is a corrected parameter, and is corrected when the third-stage basic parameter data cannot meet the requirement after being corrected to a limit value; the third-stage basic parameter data is a basic parameter which is obtained by presetting parameters through the oil-immersed temperature measuring device and is not corrected, and is corrected firstly in the correcting process;
step 2, determining a value of a check point j according to the environment monitoring value, and determining a value of a check point i according to the output temperature;
step 3, extracting the associated calibration parameters T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1) according to the i value and the j value, and calculating the current calibration parameter T according to an interpolation methodb' and extracting associated preset basic parameter data;
step 4, adjusting the third-level basic parameter data in the associated preset parameter data to the limit value of each preset parameter, calculating the adjusted calibration parameters T (i, j), T (i, j +1), T (i +1, j) and T (i +1, j +1), and calculating the calibration parameter T according to an interpolation methodB′；
Step 5, calculating the calibration parameter TB' and TbDifference of' and TL-a size relationship of 1, and,
if TB′-Tb' > more than or equal to TL-1, in proportion (T)L-2/TB′-Tb') correcting the third-stage basic parameter data to obtain two tables with the deviation of 1 ℃, and storing the data to quit correction;
if TB′-Tb′＜TL-1, adjusting the third level basic parameter data to limit value save data;
step 6, correcting the second-stage basic parameter data according to the calculation principle of the step 4 and the step 5, and if the deviation of the two tables is 1 ℃ after correction, storing the data and quitting the correction; otherwise, go to step 7;
step 7, correcting the first-stage basic parameter data according to the calculation principle of the step 4 and the step 5, and if the deviation of the two tables is 1 ℃ after correction, storing the data and quitting the correction; otherwise, the data is saved and a warning is sent to the online calibration terminal.
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