CN109116282B - A method and system for correcting temperature effects of a power frequency electric field measuring device - Google Patents
A method and system for correcting temperature effects of a power frequency electric field measuring device Download PDFInfo
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- CN109116282B CN109116282B CN201811158535.6A CN201811158535A CN109116282B CN 109116282 B CN109116282 B CN 109116282B CN 201811158535 A CN201811158535 A CN 201811158535A CN 109116282 B CN109116282 B CN 109116282B
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- 230000005684 electric field Effects 0.000 title claims abstract description 363
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000002277 temperature effect Effects 0.000 title claims description 3
- 238000005259 measurement Methods 0.000 claims abstract description 64
- 238000004364 calculation method Methods 0.000 claims abstract description 28
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000007423 decrease Effects 0.000 claims description 43
- 230000008569 process Effects 0.000 claims description 22
- 230000009467 reduction Effects 0.000 claims description 14
- 238000011946 reduction process Methods 0.000 claims description 14
- 238000007781 pre-processing Methods 0.000 claims description 7
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
本发明提供一种工场电场测量装置的温度影响校正方法和系统，其将工频电场测量装置以及所用支架一起放置于温度、湿度连续可调的密闭空间的工频电场发生装置内，通过湿度恒定时调节温度获取温度变化对工频电场测量装置的影响规律，并通过计算得到相应的温度影响修正系数，然后对不同湿度下的温度修正系数进行数值拟合，得到对应的修正函数，以及根据所述工频电场测量装置在实际测量中的读数和修正函数进行数值修正。和现有技术相比，本发明的方法和系统克服了现有部分温度敏感型工频电场测量装置随温度变化较大、难以满足不同温度下应用的缺陷，获得的测量结果更准确。
The present invention provides a method and system for correcting the temperature influence of a factory electric field measuring device, which places the power frequency electric field measuring device and the bracket used together in a power frequency electric field generating device in a closed space with continuously adjustable temperature and humidity, and obtains the influence of temperature change on the power frequency electric field measuring device by adjusting the temperature when the humidity is constant, and obtains the corresponding temperature influence correction coefficient by calculation, and then numerically fits the temperature correction coefficient under different humidity to obtain the corresponding correction function, and performs numerical correction according to the reading and correction function of the power frequency electric field measuring device in actual measurement. Compared with the prior art, the method and system of the present invention overcome the defects of some existing temperature-sensitive power frequency electric field measuring devices that change greatly with temperature and are difficult to meet the application requirements at different temperatures, and the obtained measurement results are more accurate.
Description
Technical Field
The present invention relates to the field of measurement technology, and more particularly, to a method and system for correcting temperature effects of a plant electric field measurement device.
Background
In order to obtain the electric field level of the actual alternating current power transmission and transformation project, a power frequency electric field instrument is generally adopted to measure the electric field intensity, so as to overcome the defect that the conventional capacitive electric field instrument has larger influence along with humidity, various novel electric field measuring devices such as photoelectricity and MEMS (micro-electromechanical systems) are developed at present, practical application shows that part of novel electric field devices are larger in influence due to temperature change although the influence of humidity is overcome, the requirement of outdoor wide temperature change range power frequency electric field accurate measurement is difficult to meet, the conventional research shows that not only an electric field probe can influence a measurement result, but also different electric field brackets can influence the measurement result, the size gap spacing of a traditional correction platform is generally about 1m, the height of the power frequency electric field measuring device after the bracket is about 1.5m, and the traditional platform and system are difficult to meet the power frequency electric field temperature influence correction requirement of the bracket. There is therefore an urgent need to propose a method and a system for completely housing the probe and the support used for the industrial frequency electric field measuring device, and for correcting the industrial frequency electric field measuring device, which are affected by temperature.
Disclosure of Invention
In order to solve the technical problem that in the prior art, only the probe body of the power frequency electric field measuring device is calibrated at fixed humidity to cause inaccurate measuring results, the invention provides a method for correcting the temperature influence of the power frequency electric field measuring device, which comprises the following steps:
measuring the temperature and the relative humidity of the environment where the power frequency electric field measuring device is located at preset time intervals;
a power frequency electric field measuring device measures a first electric field reading of the power frequency electric field;
When the relative humidity of the environment where the power frequency electric field measuring device is located is unchanged and the temperature is changed, carrying out numerical correction on the power frequency electric field measuring device according to the first electric field reading and a preset temperature correction function based on the direction of temperature increase or decrease to determine the actual reading of the power frequency electric field, wherein the temperature correction function is obtained by carrying out numerical fitting on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under different humidity.
Further, before measuring the temperature and the relative humidity of the environment where the power frequency electric field measuring device is located at a predetermined time interval, determining a temperature correction function of the power frequency electric field measuring device for measuring the power frequency electric field, wherein:
Step 1, placing a power frequency electric field measuring device to be corrected between parallel polar plates of a parallel polar plate power frequency electric field generating device, and stretching a support to a normal working height specified by the power frequency electric field measuring device, wherein the parallel polar plate power frequency electric field generating device is placed in a sealed experimental container with preset temperature and humidity capable of being continuously adjusted, the parallel polar plate power frequency electric field generating device comprises two upper and lower parallel polar plates, a high-voltage alternating current power supply and a high-voltage alternating current voltage measuring table, the upper polar plate is connected with the high-voltage alternating current power supply, the lower polar plate is grounded, and two ends of the high-voltage alternating current high-voltage measuring table are respectively connected with the upper polar plate and the lower polar plate so as to be used for measuring voltages between the polar plates;
step 2, applying a fixed high voltage on the upper polar plate, and generating a stable electric field between the two parallel polar plates;
step 3, fixing a relative humidity value, gradually increasing the temperature from a first set value to a second set value, recording electric field readings T i of the power frequency electric field measuring device at different temperatures, and calculating a temperature increase correction coefficient T ix of the power frequency electric field measuring device according to electric field readings T i at different temperatures and electric field readings T s of standard temperature values determined in the temperature increase process;
Step 4, keeping the relative humidity value in the step 3 unchanged, gradually reducing the temperature from the second set value to the first set value, recording electric field readings T d of the power frequency electric field measuring device at different temperatures, and calculating a temperature reduction correction coefficient T dx of the power frequency electric field measuring device according to the electric field readings T d at different temperatures and the electric field readings T s of standard temperature values determined in the temperature reduction process;
Step 5, changing the relative humidity value, repeating the steps 3 and 4, and obtaining the change rule of the electric field reading of the power frequency electric field intensity meter along with the temperature when the theoretical electric field intensity is kept unchanged at different temperatures to obtain the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device at different relative humidities;
and 6, performing numerical fitting on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under different relative humidities to determine a temperature correction function of the power frequency electric field measuring device under different relative humidities, wherein the temperature correction function is affected by the temperature.
Further, when the relative humidity of the environment where the power frequency electric field measuring device is located is unchanged and the temperature is changed, based on the direction of temperature increase or decrease, the power frequency electric field measuring device is numerically corrected according to the first electric field reading and a preset temperature correction function, and determining the actual reading of the power frequency electric field includes:
Determining a temperature correction coefficient of the power frequency electric field measuring device corresponding to the temperature when the relative humidity is determined according to the temperature correction function and the measured relative humidity and temperature of the environment where the power frequency electric field measuring device is located;
And calculating the quotient of the first electric field reading and the temperature correction coefficient, wherein the quotient is the electric field reading of the power frequency electric field measuring device under the standard temperature value.
Further, the temperature increase correction coefficient T ix of the power frequency electric field measuring device is calculated according to the electric field readings T i and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature increase process, and the calculation formula is as follows:
Further, the temperature reduction correction coefficient T dx of the power frequency electric field measuring device is calculated according to the electric field readings T d and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature reduction process, and the calculation formula is as follows:
Further, the determining the temperature correction function of the power frequency electric field measuring device for measuring the power frequency electric field further includes combining the temperature increase correction coefficient and the temperature decrease coefficient into a temperature correction coefficient T x when the ratio of the electric field reading T i of the power frequency electric field measuring device determined in the temperature increase process to the electric field reading T d of the power frequency electric field measuring device determined in the temperature decrease process at the same temperature value is in the second interval under the same relative humidity, and the calculation formula is as follows:
Further, the first set value of the temperature is-20 ℃, the second set value is 40 ℃, and the standard temperature value is 20 ℃.
According to another aspect of the present invention, there is provided a temperature influence correction system of a power frequency electric field measurement apparatus, the system comprising:
the first measuring unit is used for measuring the temperature and the relative humidity of the environment where the power frequency electric field measuring device is located at preset time intervals;
a power frequency electric field measurement device for measuring a first electric field reading of the power frequency electric field;
And the temperature calibration unit is used for obtaining a result according to a temperature increase correction coefficient or a temperature decrease correction coefficient when the relative humidity is constant by dividing the first electric field reading by the temperature increase correction coefficient or the temperature decrease correction coefficient when the relative humidity is constant by adopting a preset temperature correction function when the temperature is changed, namely the actual electric field reading of the power frequency electric field, wherein the temperature correction function is obtained by carrying out numerical fitting on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under different humidity.
Further, the system further comprises a preprocessing unit for determining humidity correction coefficients and functions, the preprocessing unit comprising:
a closed experimental container for accommodating a power frequency electric field generating device, wherein the temperature and the humidity in the closed experimental container are continuously adjustable;
The power frequency electric field generating device is used for accommodating a power frequency electric field measuring device to be calibrated and generating a stable electric field, and is positioned in the closed experimental container and comprises two pole plates which are parallel up and down, a high-voltage alternating current power supply and a high-voltage alternating current voltage measuring meter, wherein the upper pole plate is connected with the high-voltage alternating current power supply, the lower pole plate is grounded, a stable electric field is generated between the two parallel pole plates after a fixed high voltage is applied to the upper pole plate, and two ends of the high-voltage alternating current high-voltage measuring meter are respectively connected with the upper pole plate and the lower pole plate and used for measuring the voltage between the pole plates;
The temperature correction unit is used for fixing a relative humidity value, gradually increasing the temperature from a first set value to a second set value, recording electric field readings T i of the power frequency electric field measurement device at different temperatures, and calculating a temperature increase correction coefficient T ix of the power frequency electric field measurement device according to electric field readings T i at different temperatures and electric field readings T s of standard temperature values determined in the temperature increase process; keeping the relative humidity value unchanged, gradually reducing the temperature from a second set value to a first set value, recording electric field readings T d of the power frequency electric field measuring device at different temperatures, and calculating a temperature reduction correction coefficient T dx of the power frequency electric field measuring device according to electric field readings T d at different temperatures and electric field readings T s of standard temperature values, which are determined in the temperature reduction process; changing relative humidity values, recording electric field readings when the temperature of the power frequency electric field measuring device is increased or decreased according to each relative humidity value, obtaining the change rule of the electric field readings of the power frequency electric field intensity meter along with the temperature when the electric field intensity is kept unchanged under different humidities, and obtaining the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under different relative humidities; and performing numerical fit on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measurement device under different relative humidities to determine a temperature correction function of the power frequency electric field measurement device under different relative humidities, wherein the temperature correction function is affected by the temperature.
Further, the temperature calibration unit includes:
the temperature coefficient unit is used for determining the temperature correction coefficient of the power frequency electric field measuring device corresponding to the temperature when the relative humidity is determined according to the temperature correction function and the measured relative humidity and temperature of the environment where the power frequency electric field measuring device is located;
And the result determining unit is used for calculating the quotient of the first electric field reading and the temperature correction coefficient, wherein the quotient is the electric field reading of the power frequency electric field measuring device under the standard temperature value.
Further, the temperature correction unit calculates a temperature increase correction coefficient T ix of the power frequency electric field measurement device according to the electric field readings T i and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature increase process, and the calculation formula is as follows:
Further, the temperature correction unit calculates a temperature reduction correction coefficient T dx of the power frequency electric field measurement device according to the electric field readings T d and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature reduction process, and the calculation formula is as follows:
Further, the temperature correction unit is further configured to combine, under the same relative humidity, the temperature increase correction coefficient and the temperature decrease coefficient to be a temperature correction coefficient T x when a ratio of an electric field reading T i of the power frequency electric field measurement device determined in the temperature increase process to an electric field reading T d of the power frequency electric field measurement device determined in the temperature decrease process at the same temperature value is in a second interval, where a calculation formula is:
further, the first set value set by the pretreatment unit is-20 ℃, the second set value is 40 ℃, and the standard temperature value is 20 ℃.
Further, the distance between the upper polar plate and the lower polar plate of the power frequency electric field generating device is not less than 2 meters, the upper and lower parallel polar plates are round or square, wherein when the parallel polar plates are round, the diameter of the polar plates is not less than 3 meters, and when the parallel polar plates are square, the side length of the polar plates is not less than 3 meters.
Further, when the power frequency electric field measuring device is non-humidity sensitive, the temperature correction unit only needs to determine a temperature increase correction coefficient and a temperature decrease correction coefficient under one relative humidity, and performs numerical fitting on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under the relative humidity to determine a temperature correction function, namely a temperature influence correction function of the power frequency electric field measuring device under different relative humidity, where the temperature of the non-humidity sensitive power frequency electric field measuring device is fixed, and an electric field measurement value is unchanged when humidity changes.
According to the temperature influence correction method and system for the power frequency electric field measurement device, the power frequency electric field measurement device applied to engineering and the used support are placed in the power frequency electric field generation device with a continuously temperature and humidity adjustable closed space, the influence rule of temperature change on the power frequency electric field measurement device is obtained through constant-time temperature adjustment of humidity, corresponding temperature correction coefficients are obtained through calculation, numerical fitting is carried out according to the temperature correction coefficients under different relative humidity, a temperature correction function is obtained, and correction is carried out according to the reading and correction function of the power frequency electric field measurement device in actual measurement. Compared with the prior art, the invention has the following beneficial effects:
1. the method and the system provided by the invention can correct the influence of different temperatures, and overcome the defect that the power frequency electric field measuring device can be calibrated only at a fixed temperature in the prior art;
2. The method and the system provided by the invention not only can calibrate the probe, but also can calibrate the probe in full size when the probe is connected with the bracket, thereby avoiding measurement errors caused by the fact that the probe is simply calibrated and the bracket is not calibrated;
3. The calibration method and the calibration system provided by the invention do not simply correct a fixed value at a certain temperature, but correct the fixed value by adopting a coefficient obtained when the temperature is increased according to the field application condition, otherwise correct the fixed value by adopting a coefficient obtained when the temperature is reduced, thereby avoiding inconsistent increase and decrease coefficients and errors caused by adopting single coefficient correction when the instrument changes along with the temperature;
4. The method and the system thereof provided by the invention have strong practicability and high application and popularization value, have important significance in engineering application, and can provide important technical support for all-weather power frequency electric field measurement;
5. The method and the system provided by the invention can be used for manufacturing a power frequency electric field instrument, only one temperature and humidity sensor is needed to be added on the measuring instrument, the correction functions under the influence of different temperatures are written into the software of the instrument, and the measurement result after calibration is directly displayed during on-site measurement, so that the convenience and the accuracy of the power frequency electric field measurement can be greatly improved.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flowchart of a temperature influence correction method of a power frequency electric field measuring device according to a preferred embodiment of the present invention;
Fig. 2 is a schematic diagram showing a temperature influence correction system of a power frequency electric field measuring device according to a preferred 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 examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the 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, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms 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 flowchart of a temperature influence correction method of a power frequency electric field measuring device according to a preferred embodiment of the present invention. As shown in fig. 1, a method 100 for calibrating a measurement result of a power frequency electric field device according to the preferred embodiment starts in step 101.
In step 101, a temperature correction function of a power frequency electric field measuring device for measuring the power frequency electric field is determined.
At step 102, the temperature and relative humidity of the environment at the power frequency electric site are measured at predetermined time intervals.
In step 103, a power frequency electric field measurement device measures a first electric field reading of the power frequency electric field.
In step 104, when the environmental relative humidity at the power frequency electric field is unchanged and the temperature is changed, based on the direction of temperature increase or decrease, performing numerical correction on the power frequency electric field measurement device according to the first electric field reading and a preset temperature correction function, and determining an actual reading of the power frequency electric field, wherein the temperature correction function is a function obtained by performing numerical fitting on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measurement device under different humidities.
Preferably, the determining the temperature correction function of the power frequency electric field measuring device for measuring the power frequency electric field includes:
Step 1, placing a power frequency electric field measuring device to be corrected between parallel polar plates of a parallel polar plate power frequency electric field generating device, and stretching a support to a normal working height specified by the power frequency electric field measuring device, wherein the parallel polar plate power frequency electric field generating device is placed in a sealed experimental container with preset temperature and humidity capable of being continuously adjusted, the parallel polar plate power frequency electric field generating device comprises two upper and lower parallel polar plates, a high-voltage alternating current power supply and a high-voltage alternating current voltage measuring table, the upper polar plate is connected with the high-voltage alternating current power supply, the lower polar plate is grounded, and two ends of the high-voltage alternating current high-voltage measuring table are respectively connected with the upper polar plate and the lower polar plate so as to be used for measuring voltages between the polar plates;
step 2, applying a fixed high voltage on the upper polar plate, and generating a stable electric field between the two parallel polar plates;
step 3, fixing a relative humidity value, gradually increasing the temperature from a first set value to a second set value, recording electric field readings T i of the power frequency electric field measuring device at different temperatures, and calculating a temperature increase correction coefficient T ix of the power frequency electric field measuring device according to electric field readings T i at different temperatures and electric field readings T s of standard temperature values determined in the temperature increase process;
Step 4, keeping the relative humidity value in the step 3 unchanged, gradually reducing the temperature from the second set value to the first set value, recording electric field readings T d of the power frequency electric field measuring device at different temperatures, and calculating a temperature reduction correction coefficient T dx of the power frequency electric field measuring device according to the electric field readings T d at different temperatures and the electric field readings T s of standard temperature values determined in the temperature reduction process;
step 5, changing the relative humidity value, repeating the steps 3 and 4, and obtaining the change rule of the electric field reading of the power frequency electric field intensity meter along with the temperature when the theoretical electric field intensity is kept unchanged at different temperatures to obtain the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device at different relative humidities;
and 6, performing numerical fitting on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under different relative humidities to determine a temperature correction function of the power frequency electric field measuring device under different relative humidities, wherein the temperature correction function is affected by the temperature.
Preferably, when the relative humidity of the environment where the power frequency electric field measuring device is located is unchanged and the temperature is changed, based on the direction of temperature increase or decrease, the power frequency electric field measuring device is numerically corrected according to the first electric field reading and a preset temperature correction function, and determining the actual reading of the power frequency electric field includes:
Determining a temperature correction coefficient of the power frequency electric field measuring device corresponding to the temperature when the relative humidity is determined according to the temperature correction function and the measured relative humidity and temperature of the environment where the power frequency electric field measuring device is located;
And calculating the quotient of the first electric field reading and the temperature correction coefficient, wherein the quotient is the electric field reading of the power frequency electric field measuring device under the standard temperature value.
Preferably, the temperature increase correction coefficient T ix of the power frequency electric field measuring device is calculated according to the electric field readings T i and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature increase process, and the calculation formula is as follows:
Preferably, the temperature reduction correction coefficient T dx of the power frequency electric field measuring device is calculated according to the electric field readings T d and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature reduction process, and the calculation formula is as follows:
Preferably, the method further includes combining the temperature increase correction coefficient and the temperature decrease coefficient into a temperature correction coefficient T x when a ratio of the electric field reading S i of the power frequency electric field measurement device determined during the temperature increase to the electric field reading S d of the power frequency electric field measurement device at the same temperature value during the temperature decrease is in a second interval under the same relative humidity, and the calculation formula is as follows:
Under the same relative humidity, when the electric field reading S i of the power frequency electric field measuring device determined in the temperature increasing process is not different from the electric field reading S d of the power frequency electric field measuring device at the same temperature value in the temperature reducing process, only a unique temperature correction coefficient can be adopted, and in the preferred embodiment, when the ratio of S i to S d is [0.98,1.02], only one temperature correction coefficient can be considered.
Preferably, the first set value of the temperature is-20 ℃, the second set value is 40 ℃, and the standard temperature value is 20 ℃.
Fig. 2 is a schematic diagram showing a temperature influence correction system of a power frequency electric field measuring device according to a preferred embodiment of the present invention. As shown in fig. 2, the temperature influence correction system 200 of the power frequency electric field measurement device according to the present preferred embodiment includes:
And a preprocessing unit 201, configured to determine a humidity correction function of the power frequency electric field measurement device.
A first measurement unit 202 for measuring the temperature and relative humidity of the environment at the power frequency electric site at predetermined time intervals.
And a power frequency electric field measuring device 203 for measuring a first electric field reading of the power frequency electric field.
And the temperature calibration unit 204 is configured to, when the ambient relative humidity at the power frequency electric field is unchanged and the temperature is changed, perform numerical correction on the power frequency electric field measurement device according to the first electric field reading and a preset temperature correction function based on the direction of temperature increase or decrease, and determine an actual reading of the power frequency electric field, where the temperature correction function is a function obtained by performing numerical fitting on an increase correction coefficient and a temperature decrease correction coefficient of the temperature of the power frequency electric field measurement device under different humidities.
Preferably, the preprocessing unit 201 includes:
a closed experimental container for accommodating a power frequency electric field generating device, wherein the temperature and the humidity in the closed experimental container are continuously adjustable;
The power frequency electric field generating device is used for accommodating a power frequency electric field measuring device to be calibrated and generating a stable electric field, and is positioned in the closed experimental container and comprises two pole plates which are parallel up and down, a high-voltage alternating current power supply and a high-voltage alternating current voltage measuring meter, wherein the upper pole plate is connected with the high-voltage alternating current power supply, the lower pole plate is grounded, a stable electric field is generated between the two parallel pole plates after a fixed high voltage is applied to the upper pole plate, and two ends of the high-voltage alternating current high-voltage measuring meter are respectively connected with the upper pole plate and the lower pole plate and used for measuring the voltage between the pole plates;
The temperature correction unit is used for fixing a relative humidity value, gradually increasing the temperature from a first set value to a second set value, recording electric field readings T i of the power frequency electric field measurement device at different temperatures, and calculating a temperature increase correction coefficient T ix of the power frequency electric field measurement device according to electric field readings T i at different temperatures and electric field readings T s of standard temperature values determined in the temperature increase process; keeping the relative humidity value unchanged, gradually reducing the temperature from a second set value to a first set value, recording electric field readings T d of the power frequency electric field measuring device at different temperatures, and calculating a temperature reduction correction coefficient T dx of the power frequency electric field measuring device according to electric field readings T d at different temperatures and electric field readings T s of standard temperature values, which are determined in the temperature reduction process; changing relative humidity values, recording electric field readings when the temperature of the power frequency electric field measuring device is increased or decreased according to each relative humidity value, obtaining the change rule of the electric field readings of the power frequency electric field intensity meter along with the temperature when the electric field intensity is kept unchanged under different humidities, and obtaining the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under different relative humidities; and performing numerical fit on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measurement device under different relative humidities to determine a temperature correction function of the power frequency electric field measurement device under different relative humidities, wherein the temperature correction function is affected by the temperature.
Preferably, the temperature calibration unit 204 includes:
a temperature coefficient unit 241, configured to determine a temperature correction coefficient of the power frequency electric field measurement device corresponding to a temperature when the relative humidity is determined according to a temperature correction function and the measured relative humidity and temperature of an environment where the power frequency electric field measurement device is located;
And the result determining unit 242 is configured to calculate a quotient of the first electric field reading and the temperature correction coefficient, where the quotient is an electric field reading of the power frequency electric field measuring device at a standard temperature value.
Preferably, the temperature correction unit calculates a temperature increase correction coefficient T ix of the power frequency electric field measurement device according to the electric field readings T i and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature increase process, and the calculation formula is as follows:
Preferably, the temperature correction unit calculates a temperature reduction correction coefficient T dx of the power frequency electric field measurement device according to the electric field readings T d and the electric field readings T s of the standard temperature values at different temperatures determined in the temperature reduction process, and the calculation formula is as follows:
Preferably, the temperature correction unit is further configured to combine the temperature increase correction coefficient and the temperature decrease coefficient to be a temperature correction coefficient T x when a ratio of an electric field reading T i of the power frequency electric field measurement device determined in the temperature increase process to an electric field reading T d of the power frequency electric field measurement device at the same temperature value in the temperature decrease process is in a second interval under the same relative humidity, where a calculation formula is as follows:
Preferably, the first set value of the preprocessing unit 201 is-20 ℃, the second set value is 40 ℃, and the standard temperature value is 20 ℃.
Preferably, the distance between the upper pole plate and the lower pole plate of the power frequency electric field generating device 212 should be not less than 2m, and usually take 3m, and the upper and lower parallel pole plates are circular or square, wherein when the parallel pole plates are circular, the diameter of the pole plates is not less than 3m, and when the parallel pole plates are square, the side length of the pole plates is not less than 3 m.
Preferably, when the power frequency electric field measuring device is non-humidity sensitive, the temperature correction unit only needs to determine a temperature increase correction coefficient and a temperature decrease correction coefficient under one relative humidity, and performs numerical fitting on the temperature increase correction coefficient and the temperature decrease correction coefficient of the power frequency electric field measuring device under the relative humidity to determine a temperature correction function, namely a temperature influence correction function of the power frequency electric field measuring device under different relative humidity, where the temperature of the non-humidity sensitive power frequency electric field measuring device is fixed, and an electric field measurement value is unchanged when humidity changes.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by 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 therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, 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 (12)
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| CN112540241A (en) * | 2020-11-30 | 2021-03-23 | 重庆电子工程职业学院 | Non-linear compensation system and method for electric field intensity measurement |
| CN114137468A (en) * | 2021-10-21 | 2022-03-04 | 国网浙江省电力有限公司电力科学研究院 | Correction method and system for field strength measured by DC electric field strength detector |
| CN114167120B (en) * | 2021-12-14 | 2023-09-19 | 国网山东省电力公司淄博供电公司 | Method for improving dynamic range and accuracy of measuring current of low-voltage distribution network monitoring terminal |
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| US6564158B1 (en) * | 2000-08-17 | 2003-05-13 | Holaday Industries, Inc. | Broadband electromagnetic field component measurement system |
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