CN111650418A - Temperature compensation method for intelligent low-voltage shunt sensor - Google Patents
Temperature compensation method for intelligent low-voltage shunt sensor Download PDFInfo
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- CN111650418A CN111650418A CN202010535405.0A CN202010535405A CN111650418A CN 111650418 A CN111650418 A CN 111650418A CN 202010535405 A CN202010535405 A CN 202010535405A CN 111650418 A CN111650418 A CN 111650418A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/20—Compensating for effects of temperature changes other than those to be measured, e.g. changes in ambient temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/002—Measuring real component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- General Physics & Mathematics (AREA)
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- Power Engineering (AREA)
- Nonlinear Science (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
An intelligent low-voltage shunt monitoring sensor temperature compensation method. The invention belongs to the technical field of low-voltage electricity, and particularly relates to a temperature compensation method for an intelligent low-voltage shunt monitoring sensor. The intelligent low-voltage shunt monitoring sensor temperature compensation method is capable of performing high-precision temperature compensation on the detection sensor at different temperatures. The invention firstly divides the common temperature interval into a plurality of temperature intervals, supplies standard voltage and current (theoretical value) to the tested device, and measures and reads the value in different temperature intervals. And acquiring a compensation value according to the deviation of the actual measurement value and the theoretical value. And further, the measurement accuracy of the sensor is improved under different temperature environments. The invention has the advantages of meeting the requirements of informatization monitoring and on-site indication.
Description
Technical Field
The invention belongs to the technical field of low-voltage electricity, and particularly relates to a temperature compensation method for an intelligent low-voltage shunt monitoring sensor.
Background
In recent years, the construction investment of the power distribution network in China is continuously increased, the development of the power distribution network has remarkable effect, and the power distribution network is more and more complex; however, the power distribution network becomes complex and the failure thereof is difficult to monitor. Nowadays, electric power accidents are mainly concentrated on power distribution networks, and statistically, the 400V low-voltage network faults account for 90 percent.
Moreover, distribution network low-voltage faults are various in types, and some hidden faults are in hidden positions such as walls and shafts, so that great difficulty is brought to emergency repair. In order to avoid wasting unnecessary manpower and material resources to find out such faults, a scientific method is urgently needed to be found out to solve the problem of low-voltage faults.
In addition, in the operation process of the acquisition device, the actually measured value has larger deviation aiming at the same voltage and current values under different temperature environments. The method is combined with the actual situation of wide region in China at present, and has practical significance for carrying out temperature compensation on devices under different temperature environments so as to eliminate data measurement deviation under different temperatures.
Disclosure of Invention
Aiming at the problems, the invention provides an intelligent low-voltage shunt monitoring sensor temperature compensation method capable of carrying out high-precision temperature compensation on a detection sensor at different temperatures.
The technical scheme of the invention is as follows: the intelligent low-voltage shunt monitoring sensor comprises a shell and a control circuit, wherein the control circuit comprises a CPU (central processing unit), a signal acquisition device, an A/D (analog/digital) converter, an alarm module, a communication module, a metering module and a power module;
the signal acquisition device is connected with the CPU through an A/D converter, and the CPU is connected with the alarm module, the communication module and the metering module; it is characterized in that the CPU is also connected with a temperature compensation module,
the temperature compensation module is carried out according to the following steps:
1) setting a use temperature range, and equally dividing the temperature range into x temperature intervals;
2) placing the sensor to be detected in a certain temperature interval of the plurality of temperature intervals for 0.1-1 hour;
3) supplying theoretical values, wherein the theoretical values are as follows: voltage UnAnd current InSaid current InLags said voltage Un45 degrees, said voltage UnAnd current InThe error is less than 0.1 percent, and the angle error is 0.1 degree;
4) recording actually measured voltage U0-Ux and current I0-Ix, and performing linear compensation fitting according to theoretical values; acquiring a compensation value;
5) and storing the compensation value into the temperature compensation module.
After the step 3), 5%, 10%, 20%, 100% and 120% of the theoretical value are input into the theoretical proportion value in a proportion mode, and actual measurement data under different theoretical proportion values are obtained.
And fitting the theoretical value ratio intervals by adopting a linear algorithm.
The signal acquisition device comprises a voltage transformer, a measuring current transformer, a protection current transformer and a thermistor.
The invention firstly divides the common temperature interval into a plurality of temperature intervals, supplies standard voltage and current (theoretical value) to the tested device, and measures and reads the value in different temperature intervals. And acquiring a compensation value according to the deviation of the actual measurement value and the theoretical value. And further, the measurement accuracy of the sensor is improved under different temperature environments. The invention has the advantages of meeting the requirements of informatization monitoring and on-site indication.
Drawings
Figure 1 is a schematic diagram of the structure of the intelligent low voltage shunt monitoring sensor of the present invention,
figure 2 is a schematic diagram of the internal circuit structure of the intelligent low-voltage shunt monitoring sensor of the present invention,
figure 3 is a schematic diagram of the current compensation of the present invention,
fig. 4 is a schematic diagram of the voltage compensation of the present invention.
In the figure, 1 is a lower case, 11 is a thermistor, and 2 is an upper case.
Detailed Description
The invention is described in detail with reference to the accompanying drawings 1-4, and comprises a shell and a control circuit, wherein the shell comprises an upper shell 2 and a lower shell 1, the upper shell 2 is connected with the lower shell 1 in a hinged manner, the bottom of the upper shell 2 is provided with an upper groove, the top of the lower shell 1 is provided with a lower groove, and when the upper shell 2 is matched with the lower shell 1, the upper groove and the lower groove form a circular wire clamping groove;
the control circuit comprises a CPU, a signal acquisition device, an A/D converter, an alarm module, a communication module, a metering module and a power supply module; the signal acquisition device is connected with the CPU through the A/D converter, and the CPU is connected with the alarm module, the communication module and the metering module; the signal acquisition device comprises a voltage transformer, a measuring current transformer, a protective current transformer and a thermistor 11. It is characterized in that a temperature compensation module is also connected with the CPU, as shown in figure 2.
The temperature compensation module is carried out according to the following steps:
1) setting a use temperature range, and equally dividing the temperature range into x temperature intervals; the embodiment is that the temperature interval of-50 ℃ to +80 ℃ is divided into 13 temperature intervals,
2) placing the sensor to be detected in a certain temperature interval of the plurality of temperature intervals for 0.1-1 hour; the purpose is to stabilize the temperature adaptation of the device.
3) Supplying theoretical values, wherein the theoretical values are as follows: voltage UnAnd current InSaid current InLags said voltage Un45 degrees, said voltage UnAnd current InThe error is less than 0.1 percent, and the angle error is 0.1 degree; example with the theoretical value UnIs 220V and current InIs 600A;
4) recording actually measured voltage U0-Ux and current I0-Ix, and performing linear compensation fitting according to theoretical values; acquiring a compensation value;
5) and storing the compensation value into the temperature compensation module. In practical application, the intelligent low-voltage shunt monitoring sensor can acquire real-time environment temperature due to the fact that the intelligent low-voltage shunt monitoring sensor is provided with the thermistor, the sensor calls a compensation value of a corresponding temperature interval according to the real-time environment temperature, the actually measured value is compensated, and the accuracy of the sensor can be improved.
After the step 3), 5%, 10%, 20%, 100% and 120% of the theoretical value are input into the theoretical proportion value in a proportion mode, and actual measurement data under different theoretical proportion values are obtained. According to the theoretical value UnIs 220V and current In600A, inputting different voltages and current values according to the proportion, measuring actual voltages U0-U13 and actual currents I0-I13 under different proportions,
and fitting the theoretical value ratio intervals by adopting a linear algorithm. Since the linear algorithm fitting itself belongs to the conventional technical means in the field, it is not described in detail in this case.
In order to further meet the requirement of the Internet of things, an IOT module can be additionally arranged in the circuit.
The following table shows the specific data after test correction according to the method of the present invention:
as can be seen from the above table in comparison with FIGS. 3 and 4, the method of the present invention can greatly improve the use precision of the product after correction.
The invention is mainly installed on low-voltage outgoing cables of switching stations, ring main units and box transformer low-voltage cells, is suitable for electric quantity monitoring and fault detection of 400V lines, can collect information such as running current, voltage, cable skin temperature and the like of the low-voltage lines, calculates active power and reactive power of the lines, and can detect line fault current and give a fault alarm when the lines are in fault. After temperature compensation is carried out, the operation precision can be further improved.
Claims (4)
1. An intelligent low-voltage shunt monitoring sensor temperature compensation method comprises a shell and a control circuit, wherein the control circuit comprises a CPU (central processing unit), a signal acquisition device, an A/D (analog/digital) converter, an alarm module, a communication module, a metering module and a power supply module;
the signal acquisition device is connected with the CPU through an A/D converter, and the CPU is connected with the alarm module, the communication module and the metering module; it is characterized in that the CPU is also connected with a temperature compensation module,
the temperature compensation module is carried out according to the following steps:
1) setting a use temperature range, and equally dividing the temperature range into x temperature intervals;
2) placing the sensor to be detected in a certain temperature interval of the plurality of temperature intervals for 0.1-1 hour;
3) supplying theoretical values, wherein the theoretical values are as follows: voltage UnAnd current InSaid current InLags said voltage Un45 degrees, said voltage UnAnd current InThe error is less than 0.1 percent, and the angle error is 0.1 degree;
4) recording actually measured voltage U0-Ux and current I0-Ix, and performing linear compensation fitting according to theoretical values; acquiring a compensation value;
5) and storing the compensation value into the temperature compensation module.
2. The temperature compensation method for the intelligent low-voltage shunt monitoring sensor according to claim 1, wherein after the step 3), 5%, 10%, 20%, 100% and 120% of the theoretical value are input into the theoretical proportion value in a proportion mode, and actual measurement data under different theoretical proportion values are obtained.
3. The method of claim 2, wherein a linear algorithm fit is used between theoretical ratio intervals.
4. The method according to claim 1, wherein the signal acquisition device comprises a voltage transformer, a measurement current transformer, a protection current transformer and a thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010535405.0A CN111650418A (en) | 2020-06-12 | 2020-06-12 | Temperature compensation method for intelligent low-voltage shunt sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010535405.0A CN111650418A (en) | 2020-06-12 | 2020-06-12 | Temperature compensation method for intelligent low-voltage shunt sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138362A (en) * | 2021-05-11 | 2021-07-20 | 深圳市先行电气技术有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter |
| CN113552522A (en) * | 2021-07-22 | 2021-10-26 | 杭州轨物科技有限公司 | Automatic correction method of low-voltage shunt monitoring equipment |
| CN114034919A (en) * | 2021-11-19 | 2022-02-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Voltage acquisition device based on single chip microcomputer and temperature compensation method thereof |
| WO2022171908A1 (en) * | 2021-02-10 | 2022-08-18 | Stemy Energy, S.L. | Device for the measurement of power in electrical protection panels in buildings, by means of temperature measurement |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022171908A1 (en) * | 2021-02-10 | 2022-08-18 | Stemy Energy, S.L. | Device for the measurement of power in electrical protection panels in buildings, by means of temperature measurement |
| CN113138362A (en) * | 2021-05-11 | 2021-07-20 | 深圳市先行电气技术有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter |
| CN113552522A (en) * | 2021-07-22 | 2021-10-26 | 杭州轨物科技有限公司 | Automatic correction method of low-voltage shunt monitoring equipment |
| CN114034919A (en) * | 2021-11-19 | 2022-02-11 | 中国兵器工业集团第二一四研究所苏州研发中心 | Voltage acquisition device based on single chip microcomputer and temperature compensation method thereof |
| CN114034919B (en) * | 2021-11-19 | 2024-05-24 | 中国兵器工业集团第二一四研究所苏州研发中心 | Voltage acquisition device based on single chip microcomputer and temperature compensation method thereof |
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Application publication date: 20200911 |