A method for detecting abnormal electric heating load

Abstract

The present invention relates to a method for detecting abnormal electric heating load, which includes calculating a standard resistance value, after starting the load, collecting the voltage U and power P of the load multiple times within a set time, obtaining the resistance R of the load according to the formula U*U / P, averaging multiple Rs to obtain the load's relative standard resistance value R1; abnormality detection, during operation, collecting the voltage U2 and power P2 of the load once at a set interval, obtaining the resistance R2 of the load in operation according to the formula U2*U2 / P2, using the difference between R2 and R1 as an abnormal evaluation value for determining load abnormality, and determining the load abnormality according to the abnormal evaluation value. The method adopts a learning approach, autonomously identifies, judges and optimizes throughout the process; during the execution of the method, the standard resistance value used for reference is calibrated in a targeted manner; the method can still be executed normally after part of the load is damaged and the damaged load is stripped off.

Description

Technical Field

[0001] The invention relates to a method for detecting abnormal electric heating load. Background Art

[0002] Electric heating is heating with electricity. It is a heating method or equipment that converts electrical energy into heat energy and releases heat directly or circulates heat media in heating pipes to meet heating needs. As we all know, electricity is the most environmentally friendly and clean energy because it is noiseless and has no exhaust gas. Therefore, electric heating equipment is very fashionable and superior among many heating equipment. Especially today when other energy prices are rising, people have wisely chosen electric heating.

[0003] In places with larger areas, electric heating requires multiple load units for heating, and a thermostat is needed to monitor and manage the load. Existing thermostats generally have basic protection functions such as overheating protection, duration protection, and anti-freeze protection, and do not have the function of identifying whether the load end is abnormal. Summary of the invention

[0004] One technical problem solved by one aspect of the present disclosure is to provide a method for detecting abnormal electric heating load to solve the above-mentioned technical problem.

[0005] To achieve the above object, the present invention adopts the following technical scheme:

[0006] A method for detecting abnormal electric heating load has the following steps:

[0007] Calculate the standard resistance value. After starting the load, collect the voltage U and power P of the load multiple times within the set time. Obtain the resistance R of the load according to the formula U*U / P. Average multiple Rs to obtain the load's relative standard resistance value R1.

[0008] Abnormality detection, during operation, the voltage U2 and power P2 of the load are collected once at a set interval, and the resistance R2 of the load in operation is obtained according to the formula U2*U2 / P2. The difference between R2 and R1 is used as the abnormality evaluation value for load abnormality judgment, and the load abnormality is judged according to the abnormality evaluation value.

[0009] In one of the embodiments, taking into account the uncertain factors in the operating environment and the changes in the ambient voltage, the load resistance is determined to be abnormal after the abnormal evaluation value exceeds the set deviation threshold, and the load resistance abnormality is determined to be abnormal after the number of consecutive occurrences exceeds the first warning threshold. After the load abnormality occurs, the load is cut off and an audible and visual alarm is issued.

[0010] In one of the embodiments, after the load becomes abnormal, the load is temporarily cut off. If the load is not handled within the set maintenance time, the load is restarted and enters the abnormal detection again. After the abnormal evaluation value exceeds the set deviation threshold, it is determined that the load resistance is abnormal. After the number of consecutive occurrences of the load resistance abnormality exceeds the second warning threshold, it is determined that the load is abnormal, the load will be completely cut off, and an audible and visual alarm will be issued, waiting for the load to be handled.

[0011] In one of the embodiments, considering that the resistance value of the load in a high temperature environment will change after continuous heating for a certain period of time, the calculation of the standard resistance value is re-executed after continuous heating for a period of time to calibrate the standard resistance value.

[0012] In one embodiment, the load includes several load units. During operation, if some load units are damaged, the damaged load units can be removed and the remaining loads can still continue to work. Therefore, it is necessary to re-execute the calculation of the standard resistance value, recalculate the standard resistance value of the remaining loads, and correct the standard resistance value.

[0013] Compared with the prior art, the present invention adopts a learning method to autonomously identify, judge and optimize throughout the process. During the execution of the present method, the reference standard resistance value is calibrated in a targeted manner. For example, at startup, continuous collection is performed over a period of time, and the reference standard resistance value is determined by the average value; during operation, the load abnormality is determined after the load resistance abnormality occurs for many times in a row; during operation, the standard resistance value is calculated again after continuous heating for a period of time, and the standard resistance value is dynamically corrected to ensure system stability; the present method can still be executed normally after part of the load is damaged and the damaged load is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of an overall process according to one aspect of the present disclosure. DETAILED DESCRIPTION

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0016] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0017] See also Figure 1 As shown, a method for detecting abnormal electric heating load has the following steps:

[0018] Calculate the standard resistance value. After starting the load, collect the voltage U and power P of the load multiple times within the set time. Obtain the resistance R of the load according to the formula U*U / P. Average multiple Rs to obtain the load's relative standard resistance value R1.

[0019] Abnormality detection: During operation, the voltage U2 and power P2 of the load are collected once at a set interval. The resistance R2 of the load during operation is obtained according to the formula U2*U2 / P2. The difference between R2 and R1 is used as the abnormality evaluation value for determining load abnormality. The load abnormality is determined based on the abnormality evaluation value. If the load is abnormal, an audible and visual alarm is issued and the load is cut off.

[0020] After the load becomes abnormal, the load is temporarily cut off. If the load is not handled within the set maintenance time, the load is restarted and enters the abnormal detection again. After the abnormal evaluation value exceeds the set deviation threshold, it is determined that the load resistance is abnormal. After the number of consecutive occurrences of the load resistance abnormality exceeds the second warning threshold, it is determined that the load is abnormal, and an audible and visual alarm will be issued, the load will be completely cut off, and wait for the load to be handled.

[0021] Taking into account the uncertainties in the operating environment and the changes in the ambient voltage, the load resistance is judged to be abnormal when the abnormal evaluation value exceeds the set deviation threshold, and the load resistance abnormality is judged to be abnormal when the number of consecutive occurrences of the load resistance abnormality exceeds the warning threshold.

[0022] Considering that the resistance value of the load in a high temperature environment will change after continuous heating for a certain period of time, the calculation of the standard resistance value is re-executed after continuous heating for a period of time to calibrate the standard resistance value.

[0023] Taking into account the situation where the load is partially damaged, the load includes multiple load units. If conditions permit, the damaged load unit can be removed and the remaining loads can still continue to work. Therefore, it is necessary to re-execute the calculation of the standard resistance value, recalculate the standard resistance value of the remaining load, and calibrate the standard resistance value.

[0024] More specifically:

[0025] After starting the load, first calculate the standard resistance value. Within the set time, for example, 3 minutes, collect the load voltage U and power P every 10 seconds. According to the formula U*U / P, obtain the load resistance R. A total of 18 samples are collected in 3 minutes. The average value of the 18 Rs is calculated to obtain the load's relative standard resistance value R1.

[0026] After obtaining R1, enter the abnormality detection, collect the load resistance value R2 in real time, set the time interval, for example, collect the load voltage U2 and power P2 once every 5 seconds, and obtain the resistance R2 of the load in operation according to the formula U2*U2 / P2. The difference between R2 and R1 is used as the abnormality evaluation value for load abnormality judgment.

[0027] If the abnormal evaluation value exceeds the set deviation threshold, for example, the deviation threshold is ±8% of the standard resistance value, it is judged as load resistance abnormality. If the number of consecutive occurrences of load resistance abnormality exceeds the first warning threshold, for example, the first warning threshold is 10 times, it is judged as load abnormality and an alarm is activated.

[0028] The alarm can send out warning information in the form of sound and light, and the load is temporarily cut off at the same time, waiting for the maintenance personnel to deal with the abnormal load. If no treatment is carried out within 20 minutes after the temporary load cut-off, the load is restarted and enters the abnormal detection. If the abnormal evaluation value exceeds the set deviation threshold, for example, the deviation threshold is ±8% of the standard resistance value, it is determined that the load resistance is abnormal. The number of consecutive occurrences of the load resistance abnormality exceeds the second warning threshold, for example, the second warning threshold is 5 times, it is determined that the load is abnormal, the alarm is activated again, and the load is completely shut down and waits for processing. If within 20 minutes after the temporary load cut-off, the maintenance personnel deal with the load and find that some load units in the load are damaged during the treatment, if the maintenance personnel can still work normally and meet the requirements after stripping the damaged load, the calculation of the standard resistance value is re-executed, the standard resistance value of the remaining load is recalculated, the standard resistance value is corrected, and the abnormal detection is re-entered. If the maintenance personnel cannot strip the damaged load unit or the requirements cannot be met after stripping the damaged load unit, the load will be completely cut off and wait for further treatment.

[0029] The resistance value of the load will change in a high temperature environment. After each continuous heating of the load for a period of time, for example, 30 minutes, the calculation of the standard resistance value is re-executed to calibrate the standard resistance value, and then the abnormality detection is re-entered.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting abnormal electric heating load, characterized in that: The steps are as follows: Calculate the standard resistance value, after starting the load, collect the voltage U and power P of the load multiple times within the set time, obtain the resistance R of the load according to the formula U*U / P, and average multiple Rs to obtain the load relative standard resistance value R1; the load is provided with a plurality of load units; Abnormal detection: during operation, the voltage U2 and power P2 of the load are collected once at a set interval, and the resistance R2 of the load in operation is obtained according to the formula U2*U2 / P2. The difference between R2 and R1 is used as the abnormal evaluation value for determining the load abnormality. The load abnormality is determined according to the abnormal evaluation value. When the abnormal evaluation value exceeds the set deviation threshold, it is determined that the load resistance is abnormal. When the number of consecutive occurrences of the load resistance abnormality exceeds the first warning threshold, it is determined that the load is abnormal. When the load is abnormal, an audible and visual alarm is issued; After the load is abnormal, the load is temporarily cut off. If the load is not handled within the set maintenance time, the load is restarted and enters the abnormal detection again. After the abnormal evaluation value exceeds the set deviation threshold, it is determined that the load resistance is abnormal. After the number of consecutive occurrences of the load resistance abnormality exceeds the second warning threshold, it is determined that the load is abnormal, and an audible and visual alarm will be issued, and the load will be completely cut off, waiting for the load to be handled; If the load is disposed of within the set maintenance time, and it is found that some load units in the load are damaged during the disposal, if it can still work normally and meet the requirements after the damaged load units are removed, the calculation of the standard resistance value will be re-executed, the standard resistance value of the remaining load will be recalculated, the standard resistance value will be corrected, and the abnormal detection will be re-entered; if the damaged load unit cannot be removed or the requirements cannot be met after the damaged load unit is removed, the load will be completely cut off and wait for further disposal.

2. The detection method according to claim 1, characterized in that: After the load is continuously heated for a period of time, the calculation of the standard resistance value is performed again to calibrate the standard resistance value.

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