Terminal seat temperature calibration method based on intelligent electric energy meter

Abstract

A terminal base temperature calibration method based on an intelligent electric energy meter comprises the steps of obtaining to-be-calibrated temperatures of the intelligent electric energy meter at reference temperatures, analyzing the change trend of the to-be-calibrated temperatures at the reference temperatures, dividing the to-be-calibrated temperatures with the consistent change trend into the same section at the continuous reference temperatures, and calibrating the to-be-calibrated temperatures at the same section; and obtaining a final actual metering temperature based on the temperature calibration coefficient of each section. The terminal seat temperature measuring accuracy of the intelligent electric energy meter can be improved.

Description

Technical Field

[0001] The invention relates to the field of intelligent electric energy meter measurement, and in particular to a terminal seat temperature calibration method based on an intelligent electric energy meter. Background Art

[0002] The electric energy meter is a measuring tool used to count the electricity consumption of electricity users. With the continuous deepening of the intelligentization process of urban power grids, the role played by smart meters is becoming more and more important. Real-time monitoring through the measurement data of the electric energy meter can effectively reduce the accident rate and improve safety.

[0003] In the application of electric energy meters, if the electric energy meters are used in high voltage and high current environments, if the wiring terminals are loose or the contact is poor, the terminal block will heat up after long-term operation, which may cause fire and safety accidents in serious cases. Therefore, it is particularly important for electric energy meters to accurately measure the temperature of the terminal block.

[0004] To this end, Chinese patent document CN102435975A provides a single-chip microcomputer system based on an integrated hardware clock, using an external crystal oscillator as the reference frequency of the internal hardware clock, and compensating for different temperature points according to the crystal oscillator's temperature-frequency characteristics to meet the accuracy requirements within the full temperature range.

[0005] For example, Chinese patent document CN104297716A provides an RTC calibration method, which performs RTC calibration and starts temperature compensation based on the calculated value.

[0006] There is also a temperature calibration method and system for a temperature measurement module, such as in Chinese patent document CN113029394A, which includes using a temperature measurement module to measure the temperature of a temperature reference body, obtaining a temperature measurement value, obtaining an actual value of the temperature reference body, comparing the actual value of the temperature reference body with the temperature measurement value, obtaining an actual deviation value, and an intelligent system in an intelligent device to perform temperature compensation on the temperature measurement module according to the actual deviation value to obtain a temperature compensation value, calculate n-1 temperature compensation error values, and when there are m consecutive temperature compensation error values, the average value is used as the final temperature compensation value of the temperature measurement module. In this technical solution, there is no need to manually calibrate and correct the device body, and the calibration accuracy is high. However, this technical solution cannot perform segmented and multiple corrections, and the calibration accuracy can be further improved.

[0007] However, in the prior art, there is an urgent need for a temperature calibration technology solution that can be applied to three-phase or single-phase smart energy meters and can be calibrated by segmented and multiple calibration methods. Summary of the invention

[0008] In view of the technical problems existing in the prior art, the present invention aims to provide a terminal seat temperature calibration method based on a smart electric energy meter, which can be applicable to three-phase or single-phase smart electric energy meters and can be calibrated by segmented and multiple calibration methods.

[0009] Specifically, the technical solution adopted by the present invention to solve the above technical problems is: a terminal seat temperature calibration method based on a smart electric energy meter, characterized in that it includes the following steps 1 to 5: Step 1: The smart electric energy meter obtains the temperature to be calibrated at each reference temperature and proceeds to step 2.

[0010] Step 2: The smart energy meter divides the temperature to be calibrated within the range into several intervals according to the change trend of the temperature to be calibrated under the reference temperature, obtains the reference calibration coefficient of each interval according to the temperature to be calibrated, generates the first compensation unit, and proceeds to step 3.

[0011] Step 3: The smart energy meter takes two sets of reference temperatures in each interval, and calculates two sets of temperatures to be calibrated corresponding to the two sets of reference temperatures through the first compensation unit, and then proceeds to step 4.

[0012] Step 4: The smart energy meter calculates a secondary compensation coefficient according to the two groups of temperatures to be calibrated and the two groups of reference temperatures of the first compensation unit, generates a second compensation unit, and proceeds to step 5.

[0013] Step 5: The smart electric energy meter compensates the temperature to be calibrated according to the second compensation unit to obtain the actual metering temperature.

[0014] Furthermore, in the terminal seat temperature calibration method based on the smart electric energy meter, the average value of the to-be-calibrated temperatures of a plurality of smart electric energy meters at each set of reference temperatures is taken as the average metering temperature.

[0015] Furthermore, in the terminal seat temperature calibration method based on the smart electric energy meter, the temperature to be calibrated is the actual sampling temperature after the sampling result of the smart electric energy meter at the reference temperature is converted through the sampling circuit.

[0016] Furthermore, in the terminal seat temperature calibration method based on the smart energy meter, the two sets of reference temperatures may be starting points and ending points pointing to a plurality of linear relationships, and the starting points and ending points are determined by the temperature to be calibrated.

[0017] Furthermore, in the terminal seat temperature calibration method based on the smart electric energy meter, the first compensation unit is a reference calibration coefficient pointing to the temperature to be calibrated in each interval, and the reference calibration coefficient is obtained by the following formula (1).

[0018]

[0019] In the formula and For the The reference compensation coefficient of the segment, For the The starting reference temperature of the segment, For the The end reference temperature of the segment, For the The starting reference temperature of the segment, For the The end reference temperature of the segment, n is the number of smart energy meters collected at each reference temperature, and m is the starting value for counting the number of smart energy meters.

[0020] Furthermore, in the terminal block temperature calibration method based on the smart electric energy meter, the measurement result of the temperature to be calibrated by the first compensation unit is the first compensation temperature, and the calculation result is obtained by formula (2).

[0021]

[0022] In the formula For the The temperature of the segment to be calibrated after being compensated by the first compensation unit, For the The temperature of the segment to be calibrated, and For the The benchmark compensation coefficient of the segment; Furthermore, in the terminal seat temperature calibration method based on the smart electric energy meter, the second compensation unit is a secondary compensation coefficient of the metering temperature of each interval segment after compensation by the first compensation unit, and the secondary compensation coefficient is obtained by formula (3).

[0023]

[0024] In the formula and For the The quadratic compensation coefficient of the segment, For the The starting reference temperature of the segment, For the The end reference temperature of the segment, For the The starting reference temperature of the segment, For the The end reference temperature of the segment; Furthermore, in the terminal seat temperature calibration method based on the smart electric energy meter, the actual calibration temperature is the calculation result of the temperature to be calibrated by the second compensation unit, and the calculation is obtained by formula (4).

[0025]

[0026] In the formula For the The temperature of the segment to be calibrated after being compensated by the second compensation unit, For the The temperature of the segment to be calibrated, and For the The quadratic compensation coefficient of the second compensation unit of the segment.

[0027] Compared with the prior art, the advantages of the present invention are: The terminal seat temperature calibration method based on the smart electric energy meter of the present invention can be applicable to three-phase electric energy meters or single-phase electric energy meters, is not limited by the terminal seat temperature measurement circuit and the type of electric energy meter, and can be applicable to other smart electric energy meter temperature sampling methods such as thermistors and transistors.

[0028] The principle of the terminal seat temperature calibration method based on the smart electric energy meter of the present invention is to analyze the change trend of the to-be-calibrated temperature of the smart electric energy meter at the reference temperature, classify the to-be-calibrated temperatures with the same change trend into the same type of data, and obtain the final metering result through segmented and multiple calibration methods, that is, combine the first compensation and the second compensation units to compensate for the to-be-calibrated temperature of each interval segment to obtain a more accurate metering temperature, thereby realizing the smart electric energy meter to accurately measure the terminal seat temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic diagram of a terminal block temperature calibration method based on a smart electric energy meter in an embodiment of the present invention.

[0030] Figure 2 The figure is a schematic diagram of a temperature linear structure to be calibrated in a terminal seat temperature calibration method based on a smart electric energy meter in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and in combination with specific embodiments. It is understood by those skilled in the art that the description is exemplary and the present invention is not limited to the specific embodiments.

[0032] This embodiment uses a simulated smart energy meter at a reference temperature of 0-120° C. to explain in detail the terminal seat temperature calibration method based on the smart energy meter of the present invention. The energy meter can be a three-phase energy meter or a single-phase energy meter.

[0033] like Figure 1 As shown, the terminal seat temperature calibration method based on the smart electric energy meter includes the following steps 1 to 5: Step 1: The smart electric energy meter obtains the temperature to be calibrated at each reference temperature and proceeds to step 2.

[0034] Specifically, in the terminal seat temperature calibration method based on the smart electric energy meter, several groups of temperatures to be calibrated of several smart electric energy meters at various reference temperatures are obtained with a reference temperature starting from 0°C at intervals of 10°C, and the average temperature to be calibrated at each reference temperature is calculated based on the obtained results.

[0035] The interval value in this embodiment is 10°C, however, it is not the best interval value for actual use. In fact, the best interval value depends on the actual sampling situation of the smart energy meter. The more smart energy meters used for testing, the more accurate the corresponding compensation coefficient will be.

[0036] Step 2: The smart energy meter divides the temperature to be calibrated into several intervals according to its changing trend at the reference temperature, obtains the reference calibration coefficient of each interval according to the temperature data to be calibrated, generates a first compensation unit, and proceeds to step 3.

[0037] Step 3: The smart energy meter takes two sets of reference temperatures in each interval, and calculates the temperature to be calibrated under the calibration temperature through the first compensation unit, and then proceeds to step 4.

[0038] Specifically, the smart energy meter is divided into various temperature intervals to be calibrated. Figure 2 In this schematic Figure 2 In the figure, the horizontal axis is the temperature to be calibrated collected by the smart energy meter, and the vertical axis is the reference temperature. The temperature to be calibrated under each reference temperature is divided into four intervals, and the corresponding reference compensation coefficient is obtained according to formula (1) to generate the first compensation unit.

[0039]

[0040] Where: and For the The reference calibration coefficient of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; n is the number of smart energy meters collected at each reference temperature, and m is the starting value for counting the number of smart energy meters; That is to say, the compensation coefficient used by the temperature to be calibrated obtained by the smart electric energy meter is determined by the interval, and the first compensation temperature is obtained by formula (2).

[0041]

[0042] In the formula For the The temperature of the segment to be calibrated after being compensated by the first compensation unit, For the The temperature of the segment to be calibrated, and For the For example, if the temperature to be compensated is 55°C, the first compensation temperature is obtained by using the first compensation unit in interval 3. Similarly, any two sets of data in each interval are taken through formula (1) and the corresponding first compensation temperature is obtained by passing through the first compensation unit.

[0043]

[0044] In the formula and For the The reference compensation coefficient of the segment, For the The starting reference temperature of the segment, For the The end reference temperature of the segment, For the The starting reference temperature of the segment, For the The end reference temperature of the segment, n is the number of smart energy meters collected at each reference temperature, and m is the starting value for counting the number of smart energy meters.

[0045] Step 4: The smart energy meter calculates a secondary compensation coefficient according to the temperature to be calibrated and the reference temperature of the first compensation unit to generate a second compensation unit, and then proceeds to step 5.

[0046] Step 5: The smart electric energy meter compensates the temperature to be calibrated according to the second compensation unit to obtain the actual metering temperature.

[0047] Specifically, the smart electric energy meter generates a second compensation unit according to the first compensation temperature at each reference temperature and the secondary compensation coefficient obtained according to formula (3).

[0048]

[0049] Where: and For the The quadratic compensation coefficient of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; For the The starting reference temperature of the segment, For the End reference temperature of the segment.

[0050] The final actual metering temperature is obtained through the second compensation unit using formula (4).

[0051]

[0052] In the formula For the The temperature of the segment to be calibrated after being compensated by the second compensation unit, For the The temperature of the segment to be calibrated, and For the The quadratic compensation coefficient of the second compensation unit of the segment.

[0053] According to the present invention, it can be applied to three-phase electric energy meters or single-phase electric energy meters, and is not limited to the terminal seat temperature measurement circuit and the type of electric energy meter, and can be applied to other intelligent electric energy meter temperature sampling methods such as thermistors and transistors. The principle of the calibration method of the present invention is to analyze the change trend of the temperature to be calibrated of the intelligent electric energy meter at the reference temperature, classify the temperatures to be calibrated with the same change trend into the same type of data, and obtain the final metering result through segmented and multiple calibration methods, that is, combine the first compensation and the second compensation unit to compensate for the temperature to be calibrated in each interval to obtain a more accurate metering temperature, so as to achieve accurate measurement of the terminal seat temperature by the intelligent electric energy meter.

[0054] Although the preferred embodiments of the present invention are described in detail above, it should be clearly understood that various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. The protection scope of the present invention is defined by the attached claims.

Claims

1. A terminal block temperature calibration method based on a smart electric energy meter, characterized in that: The method comprises the following steps 1 to 5: Step 1: The smart energy meter obtains the temperature to be calibrated at each reference temperature, and then proceeds to step 2; Step 2: The smart energy meter divides the temperature to be calibrated within the range into several intervals according to the change trend of the temperature to be calibrated under the reference temperature, obtains the reference calibration coefficient of each interval according to the temperature to be calibrated, generates the first compensation unit, and proceeds to step 3; Step 3: The smart energy meter takes two sets of reference temperatures in each interval, and calculates two sets of temperatures to be calibrated corresponding to the two sets of reference temperatures through the first compensation unit, and then proceeds to step 4; Step 4: The smart energy meter calculates a secondary compensation coefficient according to two sets of temperatures to be calibrated and two sets of reference temperatures of the first compensation unit, generates a second compensation unit, and proceeds to step 5; Step 5: The smart electric energy meter compensates the temperature to be calibrated according to the second compensation unit to obtain the actual metering temperature.

2. The temperature calibration method according to claim 1, characterized in that: The average value of the temperatures to be calibrated of several smart energy meters at each group of reference temperatures is taken as the average metering temperature.

3. The temperature calibration method according to claim 1 or 2, characterized in that: The temperature to be calibrated is the actual sampling temperature after the sampling result of the sampling circuit of the smart electric energy meter is converted at the reference temperature.

4. The temperature calibration method according to claim 1 or 2, characterized in that: The two groups of reference temperatures may be starting points and ending points pointing to a number of linear relationships, and the starting points and ending points are determined by the temperature to be calibrated.

5. The temperature calibration method according to claim 1 or 2, characterized in that: The first compensation unit is a reference calibration coefficient pointing to the temperature to be calibrated in each interval, and the reference calibration coefficient is obtained by the following formula: Where: and For the The reference calibration coefficient of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; n is the number of smart energy meters collected at each reference temperature, and m is the starting value for counting the number of smart energy meters.

6. The temperature calibration method according to claim 4, characterized in that: The first compensation unit is a reference calibration coefficient pointing to the temperature to be calibrated in each interval, and the reference calibration coefficient is obtained by the following formula: Where: and For the The reference calibration coefficient of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; n is the number of smart energy meters collected at each reference temperature, and m is the starting value for counting the number of smart energy meters.

7. The temperature calibration method according to claim 1 or 2, characterized in that: The measurement result of the temperature to be calibrated by the first compensation unit is the first compensation temperature, and its calculation formula is as follows: Where: For the The temperature of the segment to be calibrated after being compensated by the first compensation unit; For the The temperature of the segment to be calibrated; and For the The baseline compensation factor of the segment.

8. The temperature calibration method according to claim 1 or 2, characterized in that: The second compensation unit is a secondary compensation coefficient of the measured temperature of each interval after the temperature is compensated by the first compensation unit. The secondary compensation coefficient is obtained by the following formula: Where: and For the The quadratic compensation coefficient of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; For the The starting reference temperature of the segment, For the End reference temperature of the segment.

9. The temperature calibration method according to claim 4, characterized in that: The second compensation unit is a secondary compensation coefficient of the measured temperature of each interval after the temperature is compensated by the first compensation unit. The secondary compensation coefficient is obtained by the following formula: Where: and For the The quadratic compensation coefficient of the segment; For the The starting reference temperature of the segment, For the The end reference temperature of the segment; For the The starting reference temperature of the segment, For the End reference temperature of the segment.

10. The temperature calibration method according to claim 1 or 2, characterized in that: The measurement result of the temperature to be calibrated by the second compensation unit is the actual calibration temperature, which is calculated as follows: Where: For the The temperature of the segment to be calibrated after being compensated by the second compensation unit; For the The temperature of the segment to be calibrated; and For the The quadratic compensation coefficient of the second compensation unit of the segment.

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