CN113237565A - Terminal temperature measuring method and device, computer equipment and storage medium - Google Patents
Terminal temperature measuring method and device, computer equipment and storage medium Download PDFInfo
- Publication number
- CN113237565A CN113237565A CN202110429561.3A CN202110429561A CN113237565A CN 113237565 A CN113237565 A CN 113237565A CN 202110429561 A CN202110429561 A CN 202110429561A CN 113237565 A CN113237565 A CN 113237565A
- Authority
- CN
- China
- Prior art keywords
- value
- current
- terminal
- temperature
- live
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000005070 sampling Methods 0.000 claims abstract description 42
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052802 copper Inorganic materials 0.000 claims abstract description 37
- 239000010949 copper Substances 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 28
- 229910000896 Manganin Inorganic materials 0.000 claims abstract description 22
- 238000004590 computer program Methods 0.000 claims description 13
- 230000007935 neutral effect Effects 0.000 claims description 12
- 238000009529 body temperature measurement Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application relates to a terminal temperature measuring method and device, computer equipment and a storage medium. The method comprises the following steps: measuring a first zero line current value and a first live wire current value of a terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material; obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value; determining a temperature value of the terminal according to the first current difference value and the corresponding relation between the first current difference value and the temperature value; and when the temperature value of the terminal is greater than a set temperature threshold value, starting an alarm device for high-temperature alarm. By adopting the method, the monitoring efficiency of the abnormal temperature of the terminal can be improved.
Description
Technical Field
The present application relates to the field of terminal technologies, and in particular, to a terminal temperature measurement method and apparatus, a computer device, and a storage medium.
Background
With the development of terminal technology, a terminal temperature measurement technology is developed in order to find the temperature of a terminal in time and ensure the operation safety of electrical switching equipment and the like.
In the conventional technology, an electric energy meter is provided with four terminals, each terminal is regarded as a terminal to be tested, the four terminals to be tested are divided into two groups, two ends of one group of terminals to be tested are connected with live wires, and two ends of the other group of terminals to be tested are connected with zero wires. The terminal passes through to be connected between copper bar and live wire, the zero line, and wherein the copper bar is made by red copper material usually, all inlays on every copper bar and is equipped with the manganin, and live wire and zero line carry out the sampling of electric current, voltage value to the both ends of manganin. Since the terminal generates heat during use, in order to detect the temperature of the terminal, the secondary terminal generates heat through an infrared temperature meter.
However, in the conventional method, the temperature of the terminal is monitored by using an infrared thermometer by hands of a worker, and the temperature of the terminal is recorded and analyzed according to a monitored result, which is equivalent to artificial monitoring, so that the monitoring efficiency is reduced to a certain extent.
Disclosure of Invention
In view of the above, it is necessary to provide a terminal temperature measurement method, a terminal temperature measurement device, a computer device, and a storage medium, which can improve the efficiency of monitoring abnormal temperature of a terminal.
A method of measuring temperature of a terminal, the method comprising:
measuring a first zero line current value and a first live wire current value of a terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material;
obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value;
determining a temperature value of the terminal according to the first current difference value and the corresponding relation between the first current difference value and the temperature value;
and when the temperature value of the terminal is greater than a set temperature threshold value, starting an alarm device for high-temperature alarm.
In one embodiment, the method further comprises the following steps: pre-storing a characteristic curve table, wherein the characteristic curve table records the corresponding relation between the resistance value and the temperature value; determining a temperature value of the terminal according to the first current difference value and a corresponding relation between the first current difference value and the temperature value, including:
checking whether the first current difference value is larger than zero;
and when the first current difference is larger than zero, calculating and determining a resistance value according to the first current difference, and determining the temperature value of the terminal from the corresponding relation of the resistance value and the temperature value according to the resistance value.
In one embodiment, when the first current difference is not larger than zero, sampling obtains current waveform data of the phase combination between the live wire and the zero wire.
In one embodiment, before measuring the first zero line current value and the first live line current value of the terminal to be tested under the same load, the method further includes:
checking whether residual current exists between the zero line and the live wire;
when residual current exists, the alarm device is started to alarm the residual current;
and when no residual current exists, the step of measuring the first zero line current value and the first live line current value of the terminal to be measured under the same load is executed.
In one embodiment, before checking whether there is a residual current between the zero line and the live line, the method further includes:
initializing a memory measured by the electric energy meter;
sampling to obtain current waveform data of the combined phase between the live wire and the zero wire.
In one embodiment, the checking whether there is a residual current between the zero line and the live line includes:
acquiring a second live wire current value of the live wire and a second zero line current value of the zero line;
checking whether a second current difference value between the second zero line current value and the second live line current value is greater than a preset threshold value;
when the second current difference value is not larger than a preset threshold value, determining that no residual current exists between the live wire and the zero wire;
and when the second current difference value is larger than a preset threshold value, determining that residual current exists between the live wire and the zero wire.
In one embodiment, when the temperature value of the terminal is greater than the set temperature threshold value, after the alarm device is activated for high temperature alarm, the method further includes: and returning to the step of obtaining the current waveform data of the combined phase between the live wire and the zero wire by sampling.
A terminal temperature measurement device, the device comprising:
the first current value acquisition module is used for measuring the current values of a first zero line and a first live wire of the terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material;
the first current difference value determining module is used for obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value;
the temperature value determining module is used for determining a temperature value of the terminal according to the first current difference value and the corresponding relation between the first current difference value and the temperature value;
and the high-temperature alarm starting module is used for starting the alarm device to alarm at high temperature when the temperature value of the terminal is greater than a set temperature threshold value.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
measuring a first zero line current value and a first live wire current value of a terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material;
obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value;
determining a temperature value of the terminal according to the first current difference value and the corresponding relation between the first current difference value and the temperature value;
and when the temperature value of the terminal is greater than a set temperature threshold value, starting an alarm device for high-temperature alarm.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
measuring a first zero line current value and a first live wire current value of a terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material;
obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value;
determining a temperature value of the terminal according to the first current difference value and the corresponding relation between the first current difference value and the temperature value;
and when the temperature value of the terminal is greater than a set temperature threshold value, starting an alarm device for high-temperature alarm.
According to the terminal temperature measuring method, the terminal temperature measuring device, the computer equipment and the storage medium, the zero line and the live line are equivalently connected in series, the first zero line current value and the first live line current value are theoretically equal, but the resistance temperature coefficient of red copper is larger than that of manganin, and when the temperature is higher than 25 ℃, the resistance value of the red copper material is much larger than that of the manganin material at the same temperature. Therefore, the voltage value of the zero line is larger than that of the live line, and the first current value of the zero line is actually larger than that of the live line. The electric energy meter terminal obtains the first zero line current value and the first live wire current value of the terminal that awaits measuring under the same load promptly, calculate according to the first zero line current value and the first live wire current value that obtain, thereby obtain the first current difference between zero line and the live wire, combine the first current difference of record in the electric energy meter terminal and the corresponding relation between the temperature value, can confirm the temperature value of terminal, when the temperature value of terminal is greater than the temperature threshold value of settlement, the electric energy meter terminal starts alarm device and is used for the high temperature warning, thereby in case the temperature of terminal is higher than the temperature threshold value, just high temperature alarm immediately, be favorable to the maintainer in time to discover that the high temperature of terminal has the anomaly, therefore this application can improve the monitoring efficiency of terminal abnormal temperature.
Drawings
FIG. 1 is a diagram of an exemplary embodiment of a method for measuring temperature of a terminal;
FIG. 2 is a front view of a terminal in one embodiment;
FIG. 3 is a cross-sectional view of a copper bar to which a hot wire is connected in one embodiment;
FIG. 4 is a cross-sectional view of a copper bar to which the neutral wire is attached in another embodiment;
FIG. 5 is a schematic flow chart illustrating a method for measuring temperature of a terminal according to an embodiment;
FIG. 6 is a diagram illustrating a corresponding relationship between a first current difference and a temperature value;
FIG. 7 is a schematic flow chart illustrating a method for measuring temperature of a terminal according to another embodiment;
FIG. 8 is a block diagram showing the structure of a terminal temperature measuring device according to an embodiment;
FIG. 9 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The terminal temperature measuring method provided by the application can be applied to the application environment shown in fig. 1. The electric energy meter 102 can be used for measuring a voltage value and a current value, that is, a real voltage value of a live wire, a real current value of the live wire, a real current value of a zero line and a residual current are obtained through measurement. There are A, B, C, D terminals of four positions department on the electric energy meter 102, from a left side to the right side be No. 1 terminal, No. 2 terminal, No. 3 terminal and No. 4 terminal in proper order, wherein No. 1 terminal meets the input of zero line, No. 2 terminal meets the output of zero line, No. 3 terminal meets the input of live wire, No. 4 terminal meets the output of live wire, and alternating current flows in the zero line from the live wire.
The electric energy meter 102 comprises a single-phase double-loop metering chip 104, a single-phase metering chip 106 and a main chip 108, the single-phase double-loop metering chip 104 is used for obtaining a real current value of a zero line and a real current value of a live line, the single-phase metering chip 106 is used for detecting whether a second current difference value (namely residual current) exists between the live line and the zero line, and the main chip 108 is used for carrying out data processing and logic control on acquired data.
The front structure of the terminal is shown in fig. 2, wherein 1, 2, 3, 4 represent phase lines connected to A, B, C, D terminals at various positions, and A, B, C, D terminals at various positions are arranged at equal intervals.
The terminals to which the two live wires are connected (i.e., terminals No. 3 and No. 4 in fig. 1 and 2) are covered with copper bars made of red copper (typically, copper bars made of red copper). The cross-sectional view of the copper bar connected to the live wire is shown in fig. 3, the copper bar comprises two layers, the first layer is made of red copper 304, manganin 302 is embedded above the red copper 304 of the first layer, and two live wire leads sample current and voltage through two ends of the manganin (in the general sampling process, sampling is performed through two ends of the manganin).
The cross-sectional view of the copper bar connected to the neutral wire is shown in fig. 4, the copper bar only includes one layer of structure and is made of red copper 402, and the two neutral wires sample the current through two ends of the red copper.
In one embodiment, as shown in fig. 5, a method for measuring temperature of a terminal is provided, which is described by taking the method as an example for being applied to the terminal in fig. 1, and includes the following steps:
step S502, measuring the current value of a first zero line and the current value of a first live wire of a terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material.
Specifically, the resistance value of the manganin selected by the application is 100 mu omega, the resistance temperature coefficient is stable, and the maximum temperature drift is about 0.7% when the maximum current which can be borne is 100A.
The values of the current flowing through the live and neutral conductors are equal in the event of non-electricity theft or in the absence of a residual current. The method selects the red copper material with large temperature drift coefficient as a sampling device, and the resistance temperature coefficient of the red copper is 2 multiplied by 10-3The temperature coefficient of resistance of manganin is 5 multiplied by 10-6. The temperature coefficient of resistance represents the relative change in resistance value per 1 ℃ change in temperature, and is given in ppm/DEG C. Because the temperature coefficients of resistance of the red copper material and the manganin material are different by three orders of magnitude, the influence of different materials on voltage and current sampling can be obviously observed under the condition of the same temperature.
And step S504, obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value.
The first current difference is obtained by subtracting absolute values of the first zero line current value and the first live line current value.
Theoretically, the first zero line current value measured by the electric energy meter on the zero line and the first live line current value measured on the live line are equal. However, because the temperature coefficients of red copper and manganin have large differences, the resistance of the zero line is obviously greater than that of the live line at higher temperatures (generally higher than 25 ℃). At the moment, the real current value of the zero line is not equal to the theoretical current value of the zero line, the real current value of the live line is not equal to the theoretical current value of the live line, and the real current value of the zero line is larger than the real current value of the live line.
Step S506, determining a temperature value of the terminal according to the first current difference value and the corresponding relationship between the first current difference value and the temperature value.
The correspondence between the first current difference value and the temperature value has two forms, one of which is shown in table 1, and the correspondence between the first current difference value and the temperature value is recorded in the form of a table. Secondly, as shown in the graph diagram of fig. 6, the corresponding relationship between the first current difference and the temperature value is recorded in the form of a graph. In fig. 6, the horizontal axis of the histogram represents the temperature value, the vertical axis represents the first current difference value, and the position of each discrete point in the histogram is based on the data in table 1.
TABLE 1
| Temperature (. degree.C.) | First current difference (mA) | Temperature (. degree.C.) | First current difference (mA) |
| 20 | 0 | 47 | 449.86 |
| 23 | 52.31 | 52 | 533.88 |
| 26 | 91.36 | 59 | 660.03 |
| 29 | 140.68 | 66 | 775.17 |
| 32 | 189.7 | 73 | 892.23 |
| 37 | 272.65 | 80 | 1013.27 |
| 42 | 364.51 | ... | ... |
Specifically, the main chip records a correspondence between the first current difference and the temperature value, the correspondence is actually indirectly linked through the resistance value, and the corresponding temperature value can be determined according to the first current difference.
And step S508, when the temperature value of the terminal is greater than the set temperature threshold value, starting an alarm device for high-temperature alarm.
Specifically, when the temperature value of the terminal is too high and is greater than a set temperature threshold value, the register in the metering chip sets a state bit, so that the alarm device is triggered to alarm at high temperature, or communication connection is established between the register and the terminal of the monitoring room according to a general network transmission protocol, so that high-temperature alarm is realized under the condition that a network exists.
In the terminal temperature measuring method, the zero line and the live line are equivalently connected in series, the first zero line current value and the first live line current value are theoretically equal, but the resistance temperature coefficient of the red copper is larger than that of the manganin, and when the temperature is higher than 25 ℃, the resistance value of the red copper material is much larger than that of the manganin material at the same temperature. Therefore, the voltage value of the zero line is larger than that of the live line, and the first current value of the zero line is actually larger than that of the live line. The electric energy meter terminal obtains the first zero line current value and the first live wire current value of the terminal that awaits measuring under the same load promptly, calculate according to the first zero line current value and the first live wire current value that obtain, thereby obtain the first current difference between zero line and the live wire, combine the first current difference of record in the electric energy meter terminal and the corresponding relation between the temperature value, confirm the temperature value of terminal, when the temperature value of terminal is greater than the temperature threshold value of settlement, the electric energy meter terminal starts alarm device and is used for the high temperature warning, thereby in case the temperature of terminal is higher than the temperature threshold value, just high temperature warning immediately, be favorable to the maintainer in time to discover that the high temperature of terminal has the anomaly, therefore this application can improve the monitoring efficiency of terminal abnormal temperature.
In one embodiment, a characteristic curve table is stored in advance, and the corresponding relation of the resistance value and the temperature value is recorded in the characteristic curve table; determining a temperature value of the terminal according to the first current difference value and a corresponding relation between the first current difference value and the temperature value, including:
checking whether the first current difference value is larger than zero; and when the first current difference is larger than zero, calculating and determining a resistance value according to the first current difference, and determining the temperature value of the terminal from the corresponding relation of the resistance value and the temperature value according to the resistance value.
Wherein, the resistance value and the temperature value in the characteristic curve table are in one-to-one correspondence.
Specifically, when the main chip judges that the obtained first zero line current value is larger than the first live line current value, a first current difference value of the first zero line current value and the first live line current value is converted into a resistance value, and then the resistance value is converted into a corresponding temperature value. Specifically, a first current difference value of a first zero line current value and a first live line current value is converted into a resistance value, namely, a voltage difference value of a zero line voltage value and a live line voltage value measured by an electric energy meter, and the main chip calculates and obtains the resistance value according to the combination of the first current difference value of the first zero line current value and the first live line current value and an ohm law, wherein the resistance value is a part of the zero line resistance value higher than the live line resistance value due to higher temperature (higher than 25 ℃). Specifically, the resistance value is converted into a corresponding temperature value, that is, the main chip searches for a corresponding temperature value from the corresponding relationship between the resistance value and the temperature value when the converted resistance value is obtained according to the corresponding relationship between the pre-stored resistance value and the temperature value.
In this embodiment, when the first current difference is greater than zero, the resistance value is determined by calculating the first current difference, and then the temperature value of the terminal is determined according to the correspondence between the resistance value and the temperature value. Because the sensitivity of red copper to temperature is bigger, consequently, based on first current difference and resistance difference, the temperature value of terminal is convenient in time to perceive.
In one embodiment, when the first current difference is not greater than zero, sampling obtains current waveform data of a combined phase between the live line and the neutral line.
Specifically, when the main chip judges that the obtained first zero line current value is not greater than the first live line current value, the first live line current value and the first zero line current value are continuously sampled, the current directions in the zero line and the live line are not consistent, the first zero line current value and the first live line current value are combined, namely, the first zero line current value and the first live line current value are subjected to vector addition, so that combined-phase current waveform data are obtained, the combined-phase current waveform data are a group of discrete points in a time-current value histogram, and connecting lines of the combined-phase current waveform data form an approximate wavy sine.
In this embodiment, when the first current difference is not greater than zero, current and voltage sampling is continued. That is, under the condition of no high temperature alarm and relatively low temperature, the real-time monitoring is still maintained, so as to avoid delay and delay of high temperature alarm.
In one embodiment, before measuring the first zero line current value and the first live line current value of the terminal to be tested under the same load, the method further includes: checking whether residual current exists between the zero line and the live wire; when residual current exists, the alarm device is started to alarm the residual current; and when no residual current exists, the step of measuring the first zero line current value and the first live line current value of the terminal to be measured under the same load is executed.
The residual current is a second current difference value between the current values of the zero line and the live line, and causes leakage, error grounding and the like.
Because residual current also causes one of the reasons that has first current difference between zero line and the live wire, for the convenience of observing the influence that the temperature has first current difference between zero line and the live wire, so need not have under the condition of residual current between live wire and the zero line, just can guarantee to measure accurate temperature value accurately.
In this embodiment, whether residual current exists is checked, and then the next step is executed correspondingly, so that interference caused by a plurality of factors on the current difference value of the zero line and the live line is prevented, and the variable is single.
In one embodiment, before checking whether there is a residual current between the zero line and the live line, the method further includes:
and initializing the memory measured by the electric energy meter.
The initialization is equivalent to that the data obtained by measurement at the latest moment always covers the historical data, so that the data obtained by historical measurement is eliminated, and the internal memory of the electric energy meter is always kept to be maximized.
Sampling to obtain current waveform data of the combined phase between the live wire and the zero wire.
Specifically, when the main chip judges that the obtained zero line current value is not greater than the live line current value, the live line current value and the zero line current value are continuously sampled, the current directions in the zero line and the live line are inconsistent, and the zero line current value and the live line current value are combined, namely the zero line current value and the live line current value are subjected to vector addition, so that combined-phase current waveform data are obtained, the combined-phase current waveform data are a group of discrete points in a time-current value histogram, and connecting lines of the combined-phase current waveform data form an approximate sine wave.
In this embodiment, historical data is initialized, and current waveform data of the phase combination is obtained by sampling, so that the phase combination is performed subsequently with the latest obtained data, and the current waveform data of the phase combination at the latest time is obtained by collecting according to the data of the phase combination at the latest time.
In one embodiment, verifying whether there is a residual current between the neutral line and the live line comprises:
acquiring a second live wire current value of the live wire and a second zero line current value of the zero line;
checking whether a second current difference value between the second zero line current value and the second live line current value is greater than a preset threshold value;
when the second current difference value is not larger than a preset threshold value, determining that no residual current exists between the live wire and the zero wire;
and when the second current difference value is larger than a preset threshold value, determining that residual current exists between the live wire and the zero wire.
Specifically, when the temperature of the terminal is greater than 25 degrees, although the current values of the second zero line and the second live line are theoretically equal, the real current values are different, at this time, the second current difference value between the zero line and the live line is greater than a preset threshold value, for example, the preset threshold value is 3mA, and when the second current difference value between the zero line and the live line is greater than the preset threshold value, it is determined that the second current difference value is greater than the preset threshold value, and a residual current exists between the zero line and the live line; and if the second current difference is not greater than 3mA, the second current difference is not greater than a preset threshold value, and no residual current exists between the zero line and the live line.
In this embodiment, a second current difference value is obtained by obtaining a second zero line current value and a second live line current value according to the second zero line current value and the second live line current value, and whether a residual current value exists between the check zero line and the live line can be obtained by comparing the second current difference value with a preset threshold value.
In one embodiment, when the temperature value of the terminal is greater than the set temperature threshold value, after the alarm device is activated for high temperature alarm, the method further includes: and returning to the step of obtaining the current waveform data of the combined phase between the live wire and the zero wire by sampling.
In this embodiment, after the temperature value of the terminal is greater than the set temperature threshold value, the current and voltage sampling still needs to be performed. And real-time monitoring is kept, real-time alarming is facilitated, and abnormity can be found in time.
In one embodiment, a method of terminal thermometry includes:
step S702, initializing the memory measured by the electric energy meter.
And step S704, sampling to obtain current waveform data of the combined phase between the live wire and the zero wire.
And step S706, checking whether residual current exists between the zero line and the live line. When the residual current exists, step S708 is executed to activate the alarm device for alarming the residual current. After step S708 is completed, the process returns to step S704, and continues to sample and obtain the current waveform data of the phase combination between the live wire and the neutral wire. When there is no residual current, step S710 is executed to measure a first zero line current value and a first live line current value of the terminal to be tested under the same load.
And step S712, obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value.
In step S714, it is checked whether the first current difference is greater than zero. When the first current difference is greater than zero, step S716 is performed, a resistance value is determined according to the first current difference, and a temperature value of the terminal is determined from the corresponding relationship between the resistance value and the temperature value according to the resistance value. And when the first current difference value is not greater than zero, returning to execute the step S704, and sampling to obtain current waveform data of the combined phase between the live wire and the zero wire.
After step S716, step S718 is executed, and when the temperature value of the terminal is greater than the set temperature threshold value, the alarm device is activated for high temperature alarm. After the step S718 is executed, the process returns to the step S704, and continues to sample and obtain the current waveform data of the phase combination between the live wire and the neutral wire.
In this embodiment, the electric energy meter terminal is according to the first zero line current value and the first live wire current value that obtain, calculate and obtain first current difference, combine the first current difference of record in the electric energy meter terminal and the corresponding relation between the temperature value, confirm the temperature value of terminal, when the temperature value of terminal is greater than the temperature threshold value of settlement, electric energy meter terminal starts alarm device and is used for the high temperature warning, thereby in case the temperature of terminal is higher than the temperature threshold value, just high temperature alarm immediately, be favorable to maintainer in time to discover that the temperature of terminal is too high to have the anomaly, therefore this application can improve the monitoring efficiency of terminal abnormal temperature. And before the first current difference value is obtained through calculation, whether a second current difference value, namely residual current exists is checked, so that the condition that a single variable causing the first current difference value in the subsequent process is the material of the copper strip is ensured.
It should be understood that, although the steps in the flowcharts related to the above embodiments are shown in sequence as indicated by the arrows, the steps are not necessarily executed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in each flowchart related to the above embodiments may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a part of the steps or stages in other steps.
In one embodiment, as shown in fig. 8, there is provided a terminal temperature measuring device including: a first current value obtaining module 802, a first current difference value determining module 804, a temperature value determining module 806, and a high temperature alarm starting module 808, wherein:
the first current value acquisition module 802 is configured to measure a first zero line current value and a first live line current value of the terminal to be tested under the same load, where two zero lines connected to one side of the terminal to be tested perform voltage sampling through a red copper material, and two live lines connected to the other side of the terminal to be tested perform voltage sampling through a manganin material;
a first current difference determining module 804, configured to obtain a first current difference between the zero line and the live line according to the first zero line current value and the first live line current value;
a temperature value determining module 806, configured to determine a temperature value of the terminal according to the first current difference value and a corresponding relationship between the first current difference value and the temperature value;
and the high-temperature alarm starting module 808 is used for starting an alarm device for high-temperature alarm when the temperature value of the terminal is greater than a set temperature threshold value.
In one embodiment, the temperature value determination module includes: a first current difference check module comprising:
checking whether the first current difference value is larger than zero; when the first current difference value is larger than zero, calculating and determining a resistance value according to the first current difference value, and determining a temperature value of the terminal from the corresponding relation of the resistance value and the temperature value according to the resistance value; and when the first current difference value is not more than zero, sampling to obtain current waveform data of a combined phase between the live wire and the zero wire.
In one embodiment, the terminal temperature measuring device further includes: the residual current checking module is used for checking whether residual current exists between the zero line and the live wire or not; when residual current exists, the alarm device is started to alarm the residual current; and when no residual current exists, the step of measuring the first zero line current value and the first live line current value of the terminal to be measured under the same load is executed.
In one embodiment, the terminal temperature measuring device further includes: a data initialization module and a data sampling module, wherein:
the data initialization module is used for initializing the memory measured by the electric energy meter;
and the data sampling module is used for sampling and obtaining the current waveform data of the combined phase between the live wire and the zero line.
In one embodiment, the residual current verification module comprises
The second current value acquisition module is used for acquiring a second live wire current value of the live wire and a second zero line current value of the zero line, wherein the second live wire current value and the second zero line current value are obtained by sampling of the same mutual inductor;
the second current difference value checking module is used for checking whether a second current difference value between the second zero line current value and the second live line current value is larger than a preset threshold value or not; when the second current difference value is not larger than a preset threshold value, determining that no residual current exists between the live wire and the zero wire; and when the second current difference value is larger than a preset threshold value, determining that residual current exists between the live wire and the zero wire.
For the specific limitation of the terminal temperature measuring device, reference may be made to the above limitation on the terminal temperature measuring method, and details are not repeated here. All or part of each module in the terminal temperature measuring device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 9. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a terminal temperature measurement method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 9 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A terminal temperature measurement method is characterized by comprising the following steps:
measuring a first zero line current value and a first live wire current value of a terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material;
obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value;
determining a temperature value of the terminal according to the first current difference value and the corresponding relation between the first current difference value and the temperature value;
and when the temperature value of the terminal is greater than a set temperature threshold value, starting an alarm device for high-temperature alarm.
2. The method according to claim 1, characterized in that a characteristic curve table in which a correspondence relationship of a resistance value-a temperature value is recorded is stored in advance; determining a temperature value of the terminal according to the first current difference value and a corresponding relation between the first current difference value and the temperature value, including:
checking whether the first current difference value is larger than zero;
and when the first current difference is larger than zero, calculating and determining a resistance value according to the first current difference, and determining the temperature value of the terminal from the corresponding relation of the resistance value and the temperature value according to the resistance value.
3. The method of claim 2, wherein sampling obtains current waveform data for a phase match between the live and neutral conductors when the first current difference is not greater than zero.
4. The method of claim 1, further comprising, prior to measuring the first neutral current value and the first line current value for the terminal under test under the same load:
checking whether residual current exists between the zero line and the live wire;
when residual current exists, the alarm device is started to alarm the residual current;
and when no residual current exists, the step of measuring the first zero line current value and the first live line current value of the terminal to be measured under the same load is executed.
5. The method of claim 4, further comprising, prior to verifying whether there is a residual current between the neutral line and the live line:
initializing a memory measured by the electric energy meter;
sampling to obtain current waveform data of the combined phase between the live wire and the zero wire.
6. The method of claim 4, wherein verifying whether there is a residual current between the neutral line and the live line comprises:
acquiring a second live wire current value of the live wire and a second zero line current value of the zero line;
checking whether a second current difference value between the second zero line current value and the second live line current value is greater than a preset threshold value;
when the second current difference value is not larger than a preset threshold value, determining that no residual current exists between the live wire and the zero wire;
and when the second current difference value is larger than a preset threshold value, determining that residual current exists between the live wire and the zero wire.
7. The method of claim 1, wherein when the temperature value of the terminal is greater than a set temperature threshold value, after activating an alarm device for high temperature alarm, the method further comprises: and returning to the step of obtaining the current waveform data of the combined phase between the live wire and the zero wire by sampling.
8. A terminal temperature measuring device, the device comprising:
the first current value acquisition module is used for measuring the current values of a first zero line and a first live wire of the terminal to be tested under the same load, wherein two zero lines connected to one side of the terminal to be tested are subjected to voltage sampling through a red copper material, and two live wires connected to the other side of the terminal to be tested are subjected to voltage sampling through a manganin material;
the first current difference value determining module is used for obtaining a first current difference value of the zero line and the live line according to the first zero line current value and the first live line current value;
the temperature value determining module is used for determining a temperature value of the terminal according to the first current difference value and the corresponding relation between the first current difference value and the temperature value;
and the high-temperature alarm starting module is used for starting the alarm device to alarm at high temperature when the temperature value of the terminal is greater than a set temperature threshold value.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110429561.3A CN113237565A (en) | 2021-04-21 | 2021-04-21 | Terminal temperature measuring method and device, computer equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110429561.3A CN113237565A (en) | 2021-04-21 | 2021-04-21 | Terminal temperature measuring method and device, computer equipment and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113237565A true CN113237565A (en) | 2021-08-10 |
Family
ID=77128724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110429561.3A Pending CN113237565A (en) | 2021-04-21 | 2021-04-21 | Terminal temperature measuring method and device, computer equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113237565A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933671A (en) * | 2021-09-01 | 2022-01-14 | 郑州嘉晨电器有限公司 | MOS device temperature detection device |
| CN117824876A (en) * | 2024-03-05 | 2024-04-05 | 浙江正泰电器股份有限公司 | Terminal over-temperature early warning method and device, meter box equipment and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190214809A1 (en) * | 2018-01-10 | 2019-07-11 | Eaton Corporation | Circuit Interruption Device with Thermal Protection |
| CN210982557U (en) * | 2019-10-11 | 2020-07-10 | 威胜集团有限公司 | Electrical safety detection device and smart electric meter |
| CN211603509U (en) * | 2020-01-03 | 2020-09-29 | 云南电网有限责任公司电力科学研究院 | Novel leakage current detection circuit |
| CN111829683A (en) * | 2020-07-24 | 2020-10-27 | 浙江瑞银电子有限公司 | Indirect temperature measurement method by using resistivity temperature coefficient difference between materials |
| CN111982352A (en) * | 2020-07-24 | 2020-11-24 | 浙江瑞银电子有限公司 | Indirect temperature measurement method and structure for sampling device |
| CN212462278U (en) * | 2020-06-17 | 2021-02-02 | 厦门山秀阳光科技有限公司 | Wiring terminal with manganin shunt |
-
2021
- 2021-04-21 CN CN202110429561.3A patent/CN113237565A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190214809A1 (en) * | 2018-01-10 | 2019-07-11 | Eaton Corporation | Circuit Interruption Device with Thermal Protection |
| CN210982557U (en) * | 2019-10-11 | 2020-07-10 | 威胜集团有限公司 | Electrical safety detection device and smart electric meter |
| CN211603509U (en) * | 2020-01-03 | 2020-09-29 | 云南电网有限责任公司电力科学研究院 | Novel leakage current detection circuit |
| CN212462278U (en) * | 2020-06-17 | 2021-02-02 | 厦门山秀阳光科技有限公司 | Wiring terminal with manganin shunt |
| CN111829683A (en) * | 2020-07-24 | 2020-10-27 | 浙江瑞银电子有限公司 | Indirect temperature measurement method by using resistivity temperature coefficient difference between materials |
| CN111982352A (en) * | 2020-07-24 | 2020-11-24 | 浙江瑞银电子有限公司 | Indirect temperature measurement method and structure for sampling device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933671A (en) * | 2021-09-01 | 2022-01-14 | 郑州嘉晨电器有限公司 | MOS device temperature detection device |
| CN117824876A (en) * | 2024-03-05 | 2024-04-05 | 浙江正泰电器股份有限公司 | Terminal over-temperature early warning method and device, meter box equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6242354B2 (en) | Failure place analysis method and system for ungrounded distribution system | |
| EP3069424B1 (en) | System and method of tracking the thermal age of a heating cable | |
| CN103323703B (en) | Cable connector fault diagnosing method | |
| CN113237565A (en) | Terminal temperature measuring method and device, computer equipment and storage medium | |
| US20150094965A1 (en) | Electrical Power Grid Monitoring Apparatus, Articles of Manufacture, and Methods of Monitoring Equipment of an Electrical Power Grid | |
| WO2015048095A1 (en) | Ratio metric current measurement | |
| US20170146471A1 (en) | Method for loose joint detection in medium voltage switchgears and medium voltage switchgear itself | |
| US10073141B2 (en) | Detecting method and apparatus for abnormal electrical connection in main circuit of switchgear | |
| CN111542980B (en) | Apparatus and method for identifying fault location in electric power transmission line | |
| CN112240960B (en) | Test method, test device, computer equipment and storage medium | |
| CN107101741A (en) | A kind of temp measuring system and method | |
| CN113607351A (en) | Cable tightness testing device, method, computer equipment and storage medium | |
| CN114910756B (en) | Insulation performance evaluation method and system for low-voltage bus duct | |
| KR102171326B1 (en) | Multiple parallel sensor array system | |
| CN112881818A (en) | Electric field intensity measuring method, electric field intensity measuring device, computer equipment and storage medium | |
| WO2019166903A1 (en) | Method and device for fault location in a two-terminal transmission system | |
| CN112816789A (en) | Conductor internal resistance abnormity identification method, device, equipment and computer storage medium | |
| CN111650539A (en) | Method, system and device for detecting operating parameters of lead and computer equipment | |
| CN109186776A (en) | Detection method, device and the detection device of transmission line of electricity wire clamp fever | |
| CN113222531A (en) | Data storage and monitoring method, system, computer equipment and storage medium | |
| CN112462269A (en) | Battery health state estimation method and device based on online alternating current impedance | |
| Rad et al. | A new algorithm for optimal measurement placement, observability analysis and Harmonic State Estimation in power systems | |
| CN117214774A (en) | Online fault detection device, method and equipment for XLPE cable | |
| CN117192298A (en) | Insulation layer breakdown detection device, method and equipment for cable sample | |
| CN116540003A (en) | Cable joint disaster prevention monitoring method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230411 Address after: Full Floor 14, Unit 3, Building 2, No. 11, Middle Spectra Road, Huangpu District, Guangzhou, Guangdong 510700 Applicant after: China Southern Power Grid Digital Grid Technology (Guangdong) Co.,Ltd. Address before: Room 86, room 406, No.1, Yichuang street, Zhongxin Guangzhou Knowledge City, Huangpu District, Guangzhou City, Guangdong Province Applicant before: Southern Power Grid Digital Grid Research Institute Co.,Ltd. |