A voltage delay detection method and protection system for overvoltage and undervoltage protectors

Abstract

The present invention discloses a voltage delay detection method and protection system for an overvoltage and undervoltage protector, and relates to the technical field of overvoltage and undervoltage protectors. The voltage delay detection method for overvoltage and undervoltage protectors in this field includes the following steps: voltage fluctuation evaluation; overvoltage delay evaluation; undervoltage delay evaluation. The present invention obtains a voltage fluctuation evaluation coefficient by performing a voltage change evaluation and determines whether to trigger a protector response. Then, when the protector response is triggered, the obtained overvoltage delay evaluation coefficient is used to determine whether an overvoltage response is triggered. Finally, when an overvoltage response is not triggered, the obtained undervoltage delay evaluation coefficient is used to determine whether an undervoltage response is triggered. This achieves the effect of improving the accuracy of voltage delay detection of overvoltage and undervoltage protectors, and solves the problem of low accuracy of voltage delay detection of overvoltage and undervoltage protectors in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of over- and under-voltage protectors, and in particular to a voltage delay detection method and protection system for over- and under-voltage protectors. Background Art

[0002] In power systems, many devices have specific voltage requirements. As a critical parameter for power transmission and distribution, voltage stability is directly related to the proper operation and performance of equipment. Excessively high voltage can subject internal components to excessive current and thermal stress, accelerating aging and shortening equipment lifespan. In severe cases, it can even directly lead to equipment failure or safety incidents, posing a significant threat to personnel and property. Conversely, excessively low voltage may fail to meet the normal power requirements of equipment, causing it to malfunction or significantly degrade performance, negatively impacting the overall operational efficiency and stability of the power system. Therefore, a protective device that can detect voltage anomalies and take timely action is needed. Grid stability is crucial to the proper operation of power systems. Voltage fluctuations can affect grid stability, and thus the reliability and safety of the entire power system. Voltage delay detection methods can promptly detect voltage anomalies and take appropriate action, helping to maintain grid stability.

[0003] Existing methods mainly rely on monitoring the amplitude and frequency of the grid voltage to determine whether overvoltage or undervoltage has occurred. When the amplitude of the grid voltage exceeds the preset normal range or the frequency becomes abnormal, the overvoltage or undervoltage protector will activate the delayed judgment.

[0004] For example, the delay protection circuit announced in the invention patent with announcement number CN106300240B includes: a first comparison circuit, a first comparison circuit for comparing a first reference voltage with a sampling voltage signal; the first comparison circuit inputs the first reference voltage and the sampling voltage signal; a second comparison circuit, a second comparison circuit for comparing a second reference voltage with the output voltage of the first comparison circuit; the second comparison circuit inputs the second reference voltage and the output voltage of the first comparison circuit, and the second comparison circuit outputs an overvoltage protection signal; a charge and discharge delay circuit, which controls the delay protection time by charging and discharging, and the charge and discharge delay circuit is electrically connected to the first comparison circuit and the second comparison circuit; a protection state holding circuit, which is controlled to open and close by the output signal of the second comparison circuit, and the protection state holding circuit is electrically connected to the first comparison circuit and the second comparison circuit.

[0005] For example, the invention patent announcement with announcement number: CN110932225B discloses a method and device for setting overvoltage protection of an ultra-high / ultra-high voltage AC line, comprising: obtaining a time-varying tolerance curve of the equipment based on the power frequency overvoltage tolerance curve of the equipment in the line; comparing the maximum power frequency overvoltage generated in the line with the time-varying tolerance curve of the equipment to obtain the maximum time the equipment can withstand the maximum power frequency overvoltage; configuring the protection as multi-stage overvoltage protection to determine the power frequency overvoltage protection overvoltage setting for each stage of the line; determining the power frequency overvoltage delay for each stage of the line based on the maximum time the equipment can withstand the power frequency overvoltage and the line overvoltage operation requirements, thereby completing the setting of the overvoltage protection of the ultra-high / ultra-high voltage AC line.

[0006] However, in the process of implementing the technical solutions of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0007] In the existing technology, conventional undervoltage protectors generally adopt fixed functional modes and functional implementation methods. Existing protectors often lack flexibility in voltage detection and response, and are unable to accurately assess voltage fluctuations and make timely and effective protection actions accordingly, affecting timeliness and resulting in low accuracy of voltage delay detection of over- and undervoltage protectors. Summary of the Invention

[0008] The embodiments of the present application solve the problem of low accuracy of voltage delay detection of over-voltage and under-voltage protectors in the prior art by providing a voltage delay detection method and protection system for over-voltage and under-voltage protectors, thereby improving the accuracy of voltage delay detection of over-voltage and under-voltage protectors.

[0009] An embodiment of the present application provides a voltage delay detection method for an overvoltage and undervoltage protector, comprising the following steps: S1, obtaining voltage change data corresponding to the protector to be detected, performing voltage change evaluation to obtain a voltage fluctuation evaluation coefficient, and judging whether to trigger a protector response based on the voltage fluctuation evaluation coefficient, the voltage fluctuation evaluation coefficient is used to reflect the degree of voltage fluctuation of the protector to be detected, and the protector to be detected represents a voltage protector with a safety capacitor varistor added; S2, when the protector response is triggered, obtaining an overvoltage delay evaluation coefficient through the obtained protector trigger delay data, and judging whether to trigger an overvoltage response based on the overvoltage delay evaluation coefficient, the overvoltage delay evaluation coefficient is used to reflect the delay degree of the protector to be detected under overvoltage conditions; S3, when the overvoltage response is not triggered, obtaining an undervoltage delay evaluation coefficient through the obtained protector trigger delay data, and judging whether to trigger an undervoltage response based on the undervoltage delay evaluation coefficient, the undervoltage delay evaluation coefficient is used to reflect the delay degree of the protector to be detected under undervoltage conditions.

[0010] Furthermore, the voltage change data includes a voltage cycle, a maximum voltage and a minimum voltage; the protector trigger delay data includes an overvoltage protection trigger voltage threshold, an undervoltage protection trigger voltage threshold, an overvoltage voltage change rate and an undervoltage voltage change rate; the overvoltage protection trigger voltage threshold represents the maximum voltage set by a preset person within a preset time period; the undervoltage protection trigger voltage threshold represents the minimum voltage set by a preset person within a preset time period.

[0011] Furthermore, the specific process of obtaining the voltage change data corresponding to the protector to be detected and performing voltage change evaluation to obtain the voltage fluctuation evaluation coefficient is as follows: obtaining the initial value of voltage fluctuation, which is represented by the difference between the maximum voltage and the minimum voltage; obtaining the voltage fluctuation compliance value, which is represented by the result of a ratio operation between the initial value of voltage fluctuation and the preset maximum voltage fluctuation obtained from the database; obtaining the initial value of voltage fluctuation frequency, which is represented by the inverse of the voltage period; obtaining the voltage fluctuation frequency compliance value, which is represented by the result of a ratio operation between the initial value of voltage fluctuation frequency and the average value of preset voltage fluctuation frequency obtained from the database; obtaining the voltage fluctuation evaluation coefficient through the voltage fluctuation compliance value and the voltage fluctuation frequency compliance value.

[0012] Furthermore, the limiting expression of the voltage fluctuation evaluation coefficient is as follows:

[0013]

[0014] Where, Indicates the voltage fluctuation evaluation coefficient of the protector in the qth preset time period, q=1,2,...x, q represents the number of the preset time period, x represents the total number of preset time periods, DYBD q Indicates the initial value of voltage fluctuation of the protector in the qth preset time period, DYPL q It represents the initial value of the voltage fluctuation frequency of the protector in the qth preset time period, DYBD0 represents the preset maximum value of the voltage fluctuation, DYPL0 represents the preset average value of the voltage fluctuation frequency, and e represents a natural constant.

[0015] Furthermore, the specific process of judging whether to trigger the protector response based on the voltage fluctuation evaluation coefficient is as follows: judging whether the voltage fluctuation evaluation coefficient is not lower than the reference voltage fluctuation threshold obtained from the database: if so, the protector response is triggered; if not, the protector response is not triggered; the triggering of the protector response indicates that the protector to be detected responds to the voltage signal corresponding to when the voltage fluctuation evaluation coefficient is not lower than the reference voltage fluctuation threshold obtained from the database.

[0016] Furthermore, the specific process of obtaining the overvoltage delay evaluation coefficient is as follows: obtaining the initial overvoltage protection delay time, and the initial overvoltage protection delay time is represented by the result of a ratio operation between the difference between the maximum voltage and the overvoltage protection trigger voltage threshold and the overvoltage voltage change rate; obtaining the overvoltage protection delay compliance value, and the overvoltage protection delay compliance value is represented by the result of a ratio operation between the initial overvoltage protection delay time and the preset overvoltage delay maximum value obtained from the database; obtaining the overvoltage change compliance value, and the overvoltage change compliance value is represented by the result of a ratio operation between the overvoltage voltage change rate and the preset overvoltage voltage change rate maximum value obtained from the database; combining the overvoltage protection delay compliance value and the overvoltage change compliance value to obtain the overvoltage delay evaluation coefficient.

[0017] Furthermore, the specific process of obtaining the undervoltage delay evaluation coefficient is as follows: obtain the initial undervoltage protection delay time, and the initial undervoltage protection delay time is represented by the result of a ratio operation between the difference between the undervoltage protection trigger voltage threshold and the minimum voltage and the undervoltage voltage change rate; obtain the undervoltage protection delay compliance value, and the undervoltage protection delay compliance value is represented by the result of a ratio operation between the initial undervoltage protection delay time and the preset undervoltage delay maximum value obtained from the database; obtain the undervoltage change compliance value, and the undervoltage change compliance value is represented by the result of a ratio operation between the undervoltage voltage change rate and the preset undervoltage voltage change rate maximum value obtained from the database; obtain the undervoltage delay evaluation coefficient according to the undervoltage protection delay compliance value and the undervoltage change compliance value.

[0018] Furthermore, the specific process of judging whether to trigger an overvoltage response based on the overvoltage delay evaluation coefficient is as follows: judging whether the overvoltage delay evaluation coefficient is not lower than the reference overvoltage delay threshold obtained from the database: if so, sending a red indicator light prompt to the protector to be detected and a shutdown prompt to the relay; triggering an overvoltage response and sending a prompt to the preset personnel to adjust the high-voltage protection; when the first AC power voltage detected by the protector to be detected is adjusted to the set voltage threshold, sending a start countdown prompt to the preset personnel and a green indicator light prompt to the protector to be detected, the first AC power voltage represents the voltage detected by the protector to be detected after the high-voltage protection adjustment; if not, sending a green indicator light prompt to the protector to be detected and a start prompt to the relay; the high-voltage protection adjustment indicates sending a prompt to the preset personnel to adjust the high-voltage protection voltage through SET.

[0019] Furthermore, the specific process of judging whether to trigger an undervoltage response based on the undervoltage delay evaluation coefficient is as follows: judging whether the undervoltage delay evaluation coefficient is not lower than the reference undervoltage delay threshold value obtained from the database: if so, sending a red indicator light prompt to the protector to be detected and a shutdown prompt to the relay; triggering an undervoltage response and sending a prompt to the preset personnel to adjust the low voltage protection; when the second mains voltage is adjusted to the set voltage threshold, sending a start countdown prompt to the preset personnel and a green indicator light prompt to the protector to be detected, and the second mains voltage represents the voltage detected by the protector to be tested after the low voltage protection adjustment; if not, sending a green indicator light prompt to the protector to be detected and a start prompt to the relay; the low voltage protection adjustment indicates sending a prompt to the preset personnel to adjust the low voltage protection voltage through SET.

[0020] An embodiment of the present application provides a protection system that uses the voltage delay detection method for an overvoltage and undervoltage protector as described, including display hardware, a processor and a memory: the display hardware includes a digital tube and a data acquisition device; the processor is used to obtain a voltage fluctuation assessment coefficient, an overvoltage delay assessment coefficient and an undervoltage delay assessment coefficient by processing voltage change data and protector trigger delay data; the memory is used to store voltage change data, protector trigger delay data, voltage fluctuation assessment coefficient, overvoltage delay assessment coefficient and undervoltage delay assessment coefficient.

[0021] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0022] 1. By evaluating the voltage change, a voltage fluctuation evaluation coefficient is obtained and it is judged whether the protector response is triggered. Then, when the protector response is triggered, it is judged whether the overvoltage response is triggered by the obtained overvoltage delay evaluation coefficient. Finally, when the overvoltage response is not triggered, it is judged whether the undervoltage response is triggered by the obtained undervoltage delay evaluation coefficient. This improves the reliability of the voltage delay detection of the over-voltage and under-voltage protector, and further improves the accuracy of the voltage delay detection of the over-voltage and under-voltage protector, effectively solving the problem of low accuracy of the voltage delay detection of the over-voltage and under-voltage protector in the prior art.

[0023] 2. The voltage fluctuation evaluation coefficient is obtained through the voltage fluctuation compliance value and the voltage fluctuation frequency compliance value, and then the overvoltage delay evaluation coefficient is obtained by combining the overvoltage protection delay compliance value and the overvoltage change compliance value. Finally, the undervoltage delay evaluation coefficient is obtained according to the undervoltage protection delay compliance value and the undervoltage change compliance value, thereby achieving an improvement in the accuracy of the voltage delay detection related data of the over-voltage and under-voltage protectors, and further achieving an improvement in the effectiveness of the voltage delay detection of the over-voltage and under-voltage protectors.

[0024] 3. By judging whether the voltage fluctuation evaluation coefficient is not lower than the reference voltage fluctuation threshold, then judging whether the overvoltage delay evaluation coefficient is not lower than the reference overvoltage delay threshold, and finally judging whether the undervoltage delay evaluation coefficient is not lower than the reference undervoltage delay threshold, dynamic detection of the voltage delay of the over-voltage and under-voltage protector is achieved, thereby achieving comprehensive detection of the voltage delay of the over-voltage and under-voltage protector. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flow chart of a voltage delay detection method for an over-voltage and under-voltage protector provided in an embodiment of the present application;

[0026] Figure 2 A statistical diagram showing changes in the overvoltage protection delay compliance value versus the overvoltage delay evaluation coefficient provided in an embodiment of the present application;

[0027] Figure 3 An overall flow chart provided for the embodiments of this application;

[0028] Figure 4 This is a digital tube display diagram provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The embodiments of the present application solve the problem of low accuracy of voltage delay detection of over- and under-voltage protectors in the prior art by providing a voltage delay detection method and protection system for over- and under-voltage protectors. The method obtains voltage change data corresponding to the protector to be detected to perform voltage change evaluation to obtain a voltage fluctuation evaluation coefficient, and determines whether to trigger a protector response based on the voltage fluctuation evaluation coefficient. Then, when the protector response is triggered, the overvoltage delay evaluation coefficient is obtained by using the obtained protector trigger delay data, and whether an overvoltage response is triggered is determined based on the overvoltage delay evaluation coefficient. Finally, when the overvoltage response is not triggered, the undervoltage delay evaluation coefficient is obtained by using the obtained protector trigger delay data, and whether an undervoltage response is triggered is determined based on the undervoltage delay evaluation coefficient, thereby improving the accuracy of voltage delay detection of over- and under-voltage protectors.

[0030] The technical solution in the embodiment of the present application is to solve the problem of low accuracy of voltage delay detection of the above-mentioned over-voltage and under-voltage protector. The overall idea is as follows:

[0031] By evaluating the voltage change, the voltage fluctuation evaluation coefficient is obtained and it is judged whether the protector response is triggered. Then, when the protector response is triggered, the overvoltage delay evaluation coefficient is obtained to determine whether the overvoltage response is triggered. Finally, when the overvoltage response is not triggered, the undervoltage delay evaluation coefficient is obtained to determine whether the undervoltage response is triggered, thereby achieving the effect of improving the accuracy of the voltage delay detection of the over- and under-voltage protector.

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0033] like Figure 1 As shown, it is a flowchart of a voltage delay detection method for an over-voltage and under-voltage protector provided in an embodiment of the present application, the method comprising the following steps: S1, voltage fluctuation assessment: obtaining voltage change data corresponding to the protector to be detected, performing voltage change assessment to obtain a voltage fluctuation assessment coefficient, judging whether to trigger the protector response based on the voltage fluctuation assessment coefficient, the voltage fluctuation assessment coefficient is used to reflect the degree of voltage fluctuation of the protector to be detected, and the protector to be detected represents a voltage protector with a safety capacitor varistor added; S2, overvoltage delay assessment: when the protector response is triggered, the overvoltage delay assessment coefficient is obtained by using the obtained protector trigger delay data, and whether to trigger the overvoltage response is judged based on the overvoltage delay assessment coefficient, and the overvoltage delay assessment coefficient is used to reflect the delay degree of the protector to be detected under overvoltage conditions; S3, undervoltage delay assessment: when the overvoltage response is not triggered, the undervoltage delay assessment coefficient is obtained by using the obtained protector trigger delay data, and whether to trigger the undervoltage response is judged based on the undervoltage delay assessment coefficient, and the undervoltage delay assessment coefficient is used to reflect the delay degree of the protector to be detected under undervoltage conditions.

[0034] It should be added that the voltage change data includes the voltage cycle, the maximum voltage and the minimum voltage; the protector trigger delay data includes the overvoltage protection trigger voltage threshold, the undervoltage protection trigger voltage threshold, the overvoltage voltage change rate and the undervoltage voltage change rate; the maximum voltage represents the maximum voltage detected by the protector within the preset time period; the overvoltage protection trigger voltage threshold represents the maximum voltage set by the preset personnel within the preset time period; the undervoltage protection trigger voltage threshold represents the minimum voltage set by the preset personnel within the preset time period; the overvoltage voltage change rate represents the rate of change of the overvoltage voltage within the preset time period; the undervoltage voltage change rate represents the rate of change of the undervoltage voltage within the preset time period.

[0035] In this embodiment, the safety capacitor can filter high-frequency noise and interference signals in the circuit, thereby ensuring the stability and reliability of the circuit, and the varistor can provide overvoltage protection. By using the safety capacitor and the varistor together and adding the safety capacitor and the varistor to the voltage protector, the risk of circuit failure can be more effectively reduced. The voltage fluctuation evaluation coefficient, overvoltage delay evaluation coefficient and undervoltage delay evaluation coefficient of the voltage protector with the safety capacitor varistor are interrelated and have an effect on each other during the evaluation process. Based on the voltage fluctuation assessment coefficient, the overvoltage delay assessment and undervoltage delay assessment will only be triggered when the voltage fluctuation reaches a certain level, that is, the voltage fluctuation assessment coefficient is not lower than the reference voltage fluctuation threshold. The overvoltage delay assessment coefficient is used to determine whether the protector can respond in time under overvoltage conditions, thereby ensuring the safe operation of the circuit. The undervoltage delay assessment coefficient is used to evaluate the response time of the protector under undervoltage conditions, to ensure that the circuit can be protected in time when the voltage is insufficient. The voltage fluctuation assessment coefficient, overvoltage delay assessment coefficient and undervoltage delay assessment coefficient are used to comprehensively evaluate the performance of the voltage protector; for example, when using a refrigerator, oven and microwave oven, the voltage fluctuation assessment coefficient, overvoltage delay assessment coefficient and undervoltage delay assessment coefficient are evaluated, and the digital tubes set on the refrigerator, oven and microwave oven display indicator lights of different colors to reflect different states; thereby improving the accuracy of voltage delay detection of over- and undervoltage protectors.

[0036] It needs to be explained that the voltage cycle, maximum voltage and minimum voltage are obtained by monitoring the voltage signal within a preset time period through an oscilloscope. The overvoltage protection trigger voltage threshold and the undervoltage protection trigger voltage threshold are set in advance by the preset personnel according to the specifications of the voltage protector. The voltage signal within the preset time period is monitored by an oscilloscope, and the voltage signal monitored by the oscilloscope is collected by a data acquisition card to obtain the overvoltage voltage change rate and the undervoltage voltage change rate.

[0037] Furthermore, the specific process of obtaining the voltage change data corresponding to the protection device to be detected and performing voltage change evaluation to obtain the voltage fluctuation evaluation coefficient is as follows: obtaining the initial value of the voltage fluctuation (ie, DYBD in the limiting expression of the voltage fluctuation evaluation coefficient) q ), the initial value of voltage fluctuation is represented by the difference between the maximum voltage and the minimum voltage; obtain the voltage fluctuation compliance value, which is used to reflect the compliance of voltage fluctuation within a preset time period. The voltage fluctuation compliance value is represented by the result of the ratio operation between the initial value of voltage fluctuation and the preset maximum value of voltage fluctuation obtained from the database; obtain the initial value of voltage fluctuation frequency (i.e., DYPL in the limiting expression of voltage fluctuation assessment coefficient) q), the initial value of the voltage fluctuation frequency is represented by the inverse of the voltage period; the voltage fluctuation frequency compliance value is obtained, the voltage fluctuation frequency compliance value is used to reflect the compliance of the voltage fluctuation frequency within a preset time period, and the voltage fluctuation frequency compliance value is represented by the result of a ratio operation between the initial value of the voltage fluctuation frequency and the preset voltage fluctuation frequency average value obtained from the database; the voltage fluctuation assessment coefficient is obtained through the voltage fluctuation compliance value and the voltage fluctuation frequency compliance value.

[0038] Among them, the limiting expression of the voltage fluctuation assessment coefficient is as follows:

[0039]

[0040] Where, Indicates the voltage fluctuation evaluation coefficient of the protector in the qth preset time period, q=1,2,...x, q represents the number of the preset time period, x represents the total number of preset time periods, DYBD q Indicates the initial value of voltage fluctuation of the protector in the qth preset time period, DYPL q Indicates the initial value of the voltage fluctuation frequency of the protector in the qth preset time period, Indicates the voltage cycle of the protector in the qth preset time period, Indicates the maximum voltage of the protector in the qth preset time period, It represents the minimum voltage value of the protector in the qth preset time period, DYBD0 represents the maximum value of the preset voltage fluctuation, DYPL0 represents the average value of the preset voltage fluctuation frequency, and e represents a natural constant.

[0041] In this embodiment, the aforementioned database is a database for storing various types of setting data established before the design of a voltage delay detection method for an over-voltage and under-voltage protector provided in an embodiment of the present application. The database includes but is not limited to the maximum voltage value of the protector, the minimum voltage value of the protector, the voltage fluctuation frequency, etc., and the various numerical values therein are directly set by technical personnel. For example, the preset voltage fluctuation maximum value is represented by the maximum value of the voltage detected by the voltage protector in the historical time period in the database, and the preset voltage fluctuation frequency average value is represented by the average value of the voltage fluctuation frequency detected by the voltage protector in the historical time period in the database.

[0042] It should be understood that the algorithm in this embodiment combines analysis of voltage variation data to determine the voltage fluctuation assessment coefficient. The voltage variation data in this embodiment's algorithm is not independent and is interrelated. A larger maximum voltage does not necessarily mean a larger voltage fluctuation assessment coefficient. The impact of the minimum voltage and voltage cycle should also be considered. A shorter voltage cycle means a higher frequency of voltage fluctuations, and more frequent changes between the maximum and minimum voltage values indicate reduced voltage stability. Frequent voltage fluctuations can lead to equipment failures, grid instability, and other issues. A shortened voltage cycle can make it difficult for the voltage regulation system in the grid to respond and adjust in a timely manner, leading to an increase in the initial value of the voltage fluctuation frequency and, in turn, an increase in the voltage fluctuation assessment coefficient. The difference between the maximum and minimum voltage values directly reflects the voltage fluctuation range. A larger difference indicates more severe voltage fluctuations, leading to an increase in the initial value of the voltage fluctuation and, in turn, an increase in the voltage fluctuation assessment coefficient. The changing trends of the maximum and minimum voltage values also influence each other. When the maximum voltage increases, if the grid load remains unchanged, the minimum voltage may also increase accordingly. When the maximum voltage increases while the minimum voltage remains unchanged or decreases, the voltage fluctuation range expands, thereby increasing the voltage fluctuation assessment coefficient. The accurate quantification of the fluctuation degree of the voltage of the protector to be detected is achieved, thereby improving the accuracy of the voltage delay detection of the overvoltage and undervoltage protectors.

[0043] It should be added that the specific process of determining whether to trigger the protector response based on the voltage fluctuation evaluation coefficient is as follows: determine whether the voltage fluctuation evaluation coefficient is not lower than the reference voltage fluctuation threshold obtained from the database: if so, it indicates that the voltage fluctuation can be responded to by the protector, triggering the protector response; if not, it indicates that the voltage fluctuation degree is not obvious and cannot be responded to by the protector, and the protector response is not triggered; triggering the protector response means that the protector to be tested responds to the corresponding voltage signal when the voltage fluctuation evaluation coefficient is not lower than the reference voltage fluctuation threshold obtained from the database (the response in this application means that the voltage protector displays the different states of the monitored voltage signal through the indicator light).

[0044] Furthermore, the specific process of obtaining the overvoltage delay evaluation coefficient is as follows: obtaining the initial overvoltage protection delay time, which is represented by the result of the ratio operation of the difference between the maximum voltage and the overvoltage protection trigger voltage threshold and the overvoltage voltage change rate; obtaining the overvoltage protection delay compliance value (that is, the value in the restriction expression of the overvoltage delay evaluation coefficient); ... protection delay evaluation coefficient); obtaining the overvoltage protection delay compliance value (that is, the value in the restriction expression of the overvoltage protection delay evaluation coefficient); obtaining the overvoltage protection delay compliance value (that is, the value in the restriction expression of the overvoltage protection delay evaluation coefficient); obtaining the overvoltage protection delay compliance value (that is ), the overvoltage protection delay compliance value is used to reflect the compliance of the overvoltage protection delay within the preset time period. The overvoltage protection delay compliance value is expressed by the ratio operation of the initial overvoltage protection delay time and the preset overvoltage delay maximum value obtained from the database; the overvoltage change compliance value (i.e., the value in the restriction expression of the overvoltage delay evaluation coefficient) is obtained. ), the overvoltage change compliance value is used to reflect the compliance of the overvoltage voltage change rate within a preset time period. The overvoltage change compliance value is represented by the result of a ratio operation between the overvoltage voltage change rate and the preset maximum value of the overvoltage voltage change rate obtained from the database; the overvoltage protection delay compliance value and the overvoltage change compliance value are combined to obtain the overvoltage delay evaluation coefficient.

[0045] The overvoltage delay evaluation coefficient is obtained by the following method:

[0046]

[0047] Where, Indicates the overvoltage delay evaluation coefficient of the protector in the qth preset time period, q=1,2,...x, q represents the number of the preset time period, x represents the total number of preset time periods, Indicates the overvoltage protection delay compliance value of the protector in the qth preset time period. Indicates the overvoltage change compliance value of the protector in the qth preset time period, Indicates the maximum voltage of the protector in the qth preset time period, Indicates the overvoltage protection trigger voltage threshold of the protector in the qth preset time period, GBL q It represents the overvoltage change rate of the protector in the qth preset time period, GYF0 represents the preset maximum overvoltage delay, GBL0 represents the preset maximum overvoltage change rate, and e represents a natural constant.

[0048] In this embodiment, the preset maximum overvoltage delay value is represented by the maximum overvoltage delay value detected by the voltage protector in the historical time period in the database, the preset maximum overvoltage voltage change rate value is represented by the maximum overvoltage voltage change rate detected by the voltage protector in the historical time period in the database, and the reference voltage fluctuation threshold value is represented by the average value of the voltage fluctuation evaluation coefficient in the historical time period in the database.

[0049] Specifically, assuming that the overvoltage protection delay compliance value range is 0.4-0.8, and the overvoltage change compliance value is fixed at 0.5, such as Figure 2 As shown in the figure, it is a statistical diagram of the change of the overvoltage protection delay compliance value-overvoltage delay evaluation coefficient provided by the embodiment of the present application, which is obtained by Figure 2 It can be seen that as the overvoltage protection delay compliance value gradually increases, the overvoltage delay evaluation coefficient gradually increases, which means that the delay degree of the protector to be tested under overvoltage conditions gradually increases.

[0050] It should be understood that the algorithm in this embodiment combines analysis of the protector trigger delay data to determine the overvoltage delay evaluation coefficient. The protector trigger delay data in this embodiment's algorithm is not independent and is interrelated. A larger maximum voltage does not necessarily mean a higher overvoltage delay evaluation coefficient. The effects of the overvoltage voltage change rate and the overvoltage protection trigger voltage threshold should also be considered. A larger overvoltage protection trigger voltage threshold and a smaller difference between the maximum voltage and the overvoltage protection trigger voltage threshold result in a lower overvoltage protection delay compliance value, which in turn reduces the overvoltage delay evaluation coefficient. This means that the system voltage is more likely to reach the level that triggers protection, allowing the voltage protector to respond more quickly and take measures to protect equipment from overvoltage damage. The voltage change rate directly affects the voltage protector's response speed. A smaller voltage change rate may result in a smaller overvoltage change compliance value, which in turn reduces the overvoltage delay evaluation coefficient. This means that the voltage change rate has less impact on the voltage protector's response speed. A faster voltage protector's response speed and a larger voltage change rate may prevent the voltage protector from responding in time, potentially damaging the relay and increasing the overvoltage delay evaluation coefficient. The accurate quantification of the delay degree of the protector to be detected under overvoltage conditions is achieved, thereby improving the accuracy of voltage delay detection of the overvoltage and undervoltage protectors.

[0051] Furthermore, the specific process of obtaining the undervoltage delay evaluation coefficient is as follows: obtaining the initial undervoltage protection delay time, which is represented by the result of the ratio operation of the difference between the undervoltage protection trigger voltage threshold and the minimum voltage and the undervoltage voltage change rate; obtaining the undervoltage protection delay compliance value (that is, the value in the restriction expression of the undervoltage delay evaluation coefficient); ... ), the undervoltage protection delay compliance value is used to reflect the compliance of the undervoltage protection delay within the preset time period. The undervoltage protection delay compliance value is expressed by the ratio operation of the initial undervoltage protection delay time and the preset undervoltage delay maximum value obtained from the database; the undervoltage change compliance value (i.e., the value in the restriction expression of the undervoltage delay evaluation coefficient) is obtained. ), the undervoltage change compliance value is used to reflect the compliance of the undervoltage voltage change rate within a preset time period. The undervoltage change compliance value is represented by the result of a ratio operation between the undervoltage voltage change rate and the preset maximum undervoltage voltage change rate obtained from the database; the undervoltage delay evaluation coefficient is obtained according to the undervoltage protection delay compliance value and the undervoltage change compliance value.

[0052] The undervoltage delay evaluation coefficient is obtained by the following method:

[0053]

[0054] Where, Indicates the undervoltage delay evaluation coefficient of the protector in the qth preset time period, q=1,2,...x, q represents the number of the preset time period, x represents the total number of preset time periods, Indicates the undervoltage protection delay compliance value of the protector in the qth preset time period. Indicates the undervoltage change compliance value of the protector in the qth preset time period. Indicates the minimum voltage value of the protector in the qth preset time period, Indicates the undervoltage protection trigger voltage threshold of the protector in the qth preset time period, QBL q It represents the undervoltage voltage change rate of the protector in the qth preset time period, QYF0 represents the preset maximum undervoltage delay, QBL0 represents the preset maximum undervoltage voltage change rate, and e represents a natural constant.

[0055] In this embodiment, the preset undervoltage delay maximum value is represented by the maximum undervoltage delay value detected by the voltage protector in the historical time period in the database, and the preset undervoltage voltage change rate maximum value is represented by the maximum undervoltage voltage change rate detected by the voltage protector in the historical time period in the database.

[0056] Specifically, assuming that the undervoltage protection delay meets the value The range is 0.2-0.8, and the undervoltage change complies with the value The range is 0.5-0.8, as shown in Table 1, which is a statistical table of changes in the undervoltage delay evaluation coefficient provided in the embodiment of the present application:

[0057] Table 1 Statistics of changes in undervoltage delay evaluation coefficients

[0058]

[0059] As can be seen from the above table, as the undervoltage protection delay compliance value and the undervoltage change compliance value gradually increase, the undervoltage delay evaluation coefficient gradually increases, which means that the delay degree of the protector to be tested under undervoltage conditions gradually increases.

[0060] It's important to understand that the algorithm in this embodiment combines the protector trigger delay data analysis to determine the undervoltage delay evaluation coefficient. The protector trigger delay data in this embodiment's algorithm is not independent but rather interdependent. A higher undervoltage protection trigger voltage threshold does not necessarily increase the undervoltage delay evaluation coefficient. The effects of the undervoltage voltage change rate and minimum voltage should also be considered. The larger the undervoltage protection trigger voltage threshold, the greater the difference between the undervoltage protection trigger voltage threshold and the minimum voltage, resulting in an increase in the undervoltage protection delay compliance value, and then an increase in the undervoltage delay evaluation coefficient, which means that the system voltage needs to reduce the voltage level to trigger the undervoltage protection action. The magnitude of the voltage change rate directly affects the response speed of the voltage protector. The greater the undervoltage voltage change rate, the greater the undervoltage change compliance value may be, and then an increase in the undervoltage delay evaluation coefficient. If the response speed of the voltage protector cannot keep up with the speed of voltage reduction, then the undervoltage delay will increase, thereby increasing the risk of equipment damage. The more drastic the voltage reduction, the lower the response speed of the voltage protector may be, resulting in an increase in the undervoltage delay, thereby achieving accurate quantification of the delay degree of the protector to be detected under undervoltage conditions, and thereby achieving improved accuracy in voltage delay detection of over- and undervoltage protectors.

[0061] Furthermore, the specific process of judging whether to trigger an overvoltage response based on the overvoltage delay evaluation coefficient is as follows: judging whether the overvoltage delay evaluation coefficient is not lower than the reference overvoltage delay threshold obtained from the database: if so, sending a red indicator light prompt to the protector to be detected and a shutdown prompt to the relay; triggering an overvoltage response and sending a prompt to the preset personnel to adjust the high-voltage protection; when the first AC power voltage detected by the protector to be detected is adjusted to the set voltage threshold, sending a start countdown prompt to the preset personnel and a green indicator light prompt to the protector to be detected, the first AC power voltage represents the voltage detected by the protector to be detected after the high-voltage protection adjustment; if not, sending a green indicator light prompt to the protector to be detected and a start prompt to the relay; high-voltage protection adjustment means sending a prompt to the preset personnel to adjust the high-voltage protection voltage through SET.

[0062] In this embodiment, when the first mains voltage detected by the protector to be detected is not lower than the reference overvoltage delay threshold, it indicates that it is still in an overvoltage state, the red indicator light of the protector to be detected is in a lighted state, and the relay is in a closed state. When the first mains voltage detected by the protector to be detected is lower than the reference overvoltage delay threshold, the overvoltage state is released, and the countdown is started for 10 seconds before normal operation. The green indicator light of the protector to be detected is in a lighted state, and the high-voltage protection voltage is adjusted by SET (setting). The range of the high-voltage protection voltage is 120-150 (V). For example, when using a refrigerator, oven, and microwave oven, when an overvoltage state is detected (that is, the overvoltage delay evaluation coefficient is not lower than the reference overvoltage delay threshold), the red indicator light is always on and the relay is closed. When the overvoltage delay evaluation coefficient is lower than the reference overvoltage delay threshold, the countdown is started (default time 10S) to work, normal output, and the green indicator light is always on. By switching the yellow button to 210S, the device (refrigerator, oven, microwave oven, TV, etc.) is protected; the performance of the voltage protector under overvoltage conditions is monitored, thereby improving the accuracy of the voltage delay detection of the over-voltage and under-voltage protector.

[0063] Furthermore, the specific process of judging whether to trigger an undervoltage response based on the undervoltage delay evaluation coefficient is as follows: judging whether the undervoltage delay evaluation coefficient is not lower than the reference undervoltage delay threshold value obtained from the database: if so, sending a red indicator light prompt to the protector to be detected and a shutdown prompt to the relay; triggering an undervoltage response and sending a prompt to the preset personnel to adjust the low voltage protection; when the second mains voltage is adjusted to the set voltage threshold, sending a start countdown prompt to the preset personnel and a green indicator light prompt to the protector to be detected, and the second mains voltage represents the voltage detected by the protector to be tested after the low voltage protection adjustment; if not, sending a green indicator light prompt to the protector to be detected and a start prompt to the relay; low voltage protection adjustment means sending a prompt to the preset personnel to adjust the low voltage protection voltage through SET.

[0064] In this embodiment, when the second mains voltage detected by the protector to be detected is not lower than the reference undervoltage delay threshold, it indicates that it is still in an undervoltage state at this time, the red indicator light of the protector to be detected is in a lighted state, and the relay is in a closed state. When the second mains voltage detected by the protector to be detected is lower than the reference undervoltage delay threshold, the undervoltage state is released, and the countdown is turned on for 10 seconds before normal operation. The green indicator light of the protector to be detected is in a lighted state, and the low voltage protection voltage is adjusted by SET (setting). The range of the low voltage protection voltage is 80-110 (V); for example, when using a refrigerator, oven and microwave oven, when an undervoltage state is detected (that is, the undervoltage delay evaluation coefficient is not lower than the reference undervoltage delay threshold), the red indicator light is always on and the relay is closed. When the undervoltage delay evaluation coefficient is lower than the reference undervoltage delay threshold, the countdown is turned on (default time 10S) to work, normal output, and the green indicator light is always on. By switching the yellow button to 210S, the device (refrigerator, oven, microwave oven, TV, etc.) is protected; the performance of the voltage protector under undervoltage conditions is monitored, thereby improving the accuracy of the voltage delay detection of the over- and under-voltage protector.

[0065] In this embodiment, if Figure 3 As shown, this is the overall flow chart provided by the embodiment of the present application. The voltage fluctuation assessment module, the overvoltage delay assessment module and the undervoltage delay assessment module work together. The voltage fluctuation assessment module obtains a voltage fluctuation assessment coefficient reflecting the voltage fluctuation situation. The overvoltage delay assessment module obtains an overvoltage delay assessment coefficient reflecting the delay degree of the protector to be detected under overvoltage conditions. The undervoltage delay assessment module obtains an overvoltage delay assessment coefficient reflecting the delay degree of the protector to be detected under undervoltage conditions. Through voltage change assessment, overvoltage delay assessment and undervoltage delay assessment, comprehensive monitoring and protection of the voltage state of the protector to be detected are achieved, thereby improving the accuracy of voltage delay detection of over- and undervoltage protectors.

[0066] An embodiment of the present application provides an application such as a protection system for a voltage delay detection method for an overvoltage and undervoltage protector, including display hardware, a processor and a memory: the display hardware includes a digital tube and a data acquisition device; the digital tube is used to visualize the corresponding states of triggering the protector response, triggering the overvoltage response and triggering the undervoltage response; the data acquisition device includes an oscilloscope and a data acquisition card, and the processor is used to obtain a voltage fluctuation evaluation coefficient, an overvoltage delay evaluation coefficient and an undervoltage delay evaluation coefficient by processing the voltage change data and the protector trigger delay data; the memory is used to store the voltage change data, the protector trigger delay data, the voltage fluctuation evaluation coefficient, the overvoltage delay evaluation coefficient and the undervoltage delay evaluation coefficient. The display hardware of the embodiment of the present application also provides three switching buttons, including a red button, a green button and a yellow button. The red button is used for overvoltage setting, the green button is used for undervoltage setting, and the yellow button has a recovery function and can be used for time switching (10S-210S).

[0067] like Figure 4 As shown, this is a digital tube display diagram provided in an embodiment of the present application. From the figure, it can be seen that the digital tube displays different lighting states. The red indicator light indicates that it is in an overvoltage or undervoltage state, and the green indicator light indicates that the voltage protector and relay are working normally.

[0068] To sum up, the embodiment of the present application obtains the voltage fluctuation evaluation coefficient by performing voltage change evaluation and determines whether to trigger the protector response, and then determines whether to trigger the overvoltage response by using the obtained overvoltage delay evaluation coefficient when the protector response is triggered. Finally, when the overvoltage response is not triggered, it determines whether to trigger the undervoltage response by using the obtained undervoltage delay evaluation coefficient, thereby improving the reliability of the voltage delay detection of the over-voltage and under-voltage protector, and further improving the accuracy of the voltage delay detection of the over-voltage and under-voltage protector, effectively solving the problem of low accuracy of the voltage delay detection of the over-voltage and under-voltage protector in the prior art.

[0069] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0070] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0073] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0074] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A voltage delay detection method for an over-voltage and under-voltage protector, characterized in that: The following steps are involved: S1, obtaining voltage change data corresponding to the protector to be detected, performing voltage change evaluation to obtain a voltage fluctuation evaluation coefficient, and determining whether to trigger a protector response based on the voltage fluctuation evaluation coefficient. The voltage fluctuation evaluation coefficient is used to reflect the degree of voltage fluctuation of the protector to be detected, wherein the protector to be detected is a voltage protector with a safety capacitor varistor added; S2, when the protector is triggered to respond, an overvoltage delay evaluation coefficient is obtained by using the protector trigger delay data, and whether an overvoltage response is triggered is determined based on the overvoltage delay evaluation coefficient. The overvoltage delay evaluation coefficient is used to reflect the delay degree of the protector to be detected under overvoltage conditions; S3, when an overvoltage response is not triggered, obtaining an undervoltage delay evaluation coefficient through the acquired protector trigger delay data, and determining whether to trigger an undervoltage response based on the undervoltage delay evaluation coefficient, wherein the undervoltage delay evaluation coefficient is used to reflect the delay degree of the protector to be detected under the undervoltage condition; The specific process of obtaining the voltage change data corresponding to the protector to be detected and performing voltage change evaluation to obtain the voltage fluctuation evaluation coefficient is as follows: Obtaining an initial value of voltage fluctuation, where the initial value of voltage fluctuation is represented by a difference between a maximum voltage value and a minimum voltage value; Obtaining a voltage fluctuation compliance value, where the voltage fluctuation compliance value is represented by a result of a ratio operation between an initial voltage fluctuation value and a preset voltage fluctuation maximum value obtained from a database; Obtaining an initial value of a voltage fluctuation frequency, where the initial value of the voltage fluctuation frequency is represented by the inverse of a voltage period; Obtaining a voltage fluctuation frequency compliance value, where the voltage fluctuation frequency compliance value is represented by a result of a ratio operation between an initial voltage fluctuation frequency value and a preset voltage fluctuation frequency average value obtained from a database; Obtain the voltage fluctuation assessment coefficient through the voltage fluctuation compliance value and the voltage fluctuation frequency compliance value; The specific process of obtaining the overvoltage delay evaluation coefficient is as follows: Obtaining an initial overvoltage protection delay time, where the initial overvoltage protection delay time is represented by a ratio operation of a difference between a maximum voltage and an overvoltage protection trigger voltage threshold and an overvoltage voltage change rate; Obtaining an overvoltage protection delay compliance value, where the overvoltage protection delay compliance value is represented by a ratio calculation result of an initial overvoltage protection delay time and a preset overvoltage delay maximum value obtained from a database; Obtaining an overvoltage change compliance value, where the overvoltage change compliance value is represented by a ratio calculation result of an overvoltage voltage change rate and a preset overvoltage voltage change rate maximum value obtained from a database; Combine the overvoltage protection delay compliance value and the overvoltage change compliance value to obtain the overvoltage delay evaluation coefficient; The specific process of obtaining the undervoltage delay evaluation coefficient is as follows: Obtaining an initial undervoltage protection delay time, where the initial undervoltage protection delay time is represented by a ratio operation of a difference between an undervoltage protection trigger voltage threshold and a minimum voltage value and an undervoltage voltage change rate; Obtaining an undervoltage protection delay compliance value, wherein the undervoltage protection delay compliance value is represented by a ratio calculation result of an initial undervoltage protection delay time and a preset undervoltage delay maximum value obtained from a database; Obtaining an undervoltage change compliance value, where the undervoltage change compliance value is represented by a ratio calculation result of an undervoltage voltage change rate and a preset undervoltage voltage change rate maximum value obtained from a database; The undervoltage delay evaluation coefficient is obtained according to the undervoltage protection delay compliance value and the undervoltage change compliance value.

2. A voltage delay detection method for an over-voltage and under-voltage protector as claimed in claim 1, characterized in that: The voltage change data includes a voltage cycle, a maximum voltage value, and a minimum voltage value; The protector trigger delay data includes overvoltage protection trigger voltage threshold, undervoltage protection trigger voltage threshold, overvoltage voltage change rate and undervoltage voltage change rate; The overvoltage protection trigger voltage threshold represents the maximum voltage set by the preset personnel within the preset time period; The undervoltage protection trigger voltage threshold represents the minimum voltage set by a preset person within a preset time period.

3. A voltage delay detection method for an over-voltage and under-voltage protector according to claim 1, characterized in that: The limiting expression of the voltage fluctuation assessment coefficient is as follows: ； Where, It represents the voltage fluctuation evaluation coefficient of the protector in the qth preset time period, , q represents the number of the preset time period, x represents the total number of preset time periods, Indicates the initial value of the voltage fluctuation of the protector in the qth preset time period, Indicates the initial value of the voltage fluctuation frequency of the protector in the qth preset time period, Indicates the preset maximum voltage fluctuation value. It represents the average value of the preset voltage fluctuation frequency, and e represents a natural constant.

4. A voltage delay detection method for an over-voltage and under-voltage protector as claimed in claim 1, characterized in that: The specific process of determining whether to trigger the protector response based on the voltage fluctuation evaluation coefficient is as follows: Determine whether the voltage fluctuation assessment coefficient is not lower than the reference voltage fluctuation threshold obtained from the database: If so, the protector response is triggered; If not, the protector response is not triggered; The triggering of the protector response means that the protector to be detected responds to a voltage signal corresponding to when the voltage fluctuation evaluation coefficient is not lower than a reference voltage fluctuation threshold value obtained from a database.

5. A voltage delay detection method for an over-voltage and under-voltage protector according to claim 1, characterized in that: The specific process of determining whether to trigger an overvoltage response based on the overvoltage delay evaluation coefficient is as follows: Determine whether the overvoltage delay evaluation coefficient is not lower than the reference overvoltage delay threshold obtained from the database: If yes, send a red indicator light prompt to the protector to be detected and a shutdown prompt to the relay; Trigger overvoltage response and send prompts to preset personnel to adjust high voltage protection; When the first mains voltage detected by the protector to be tested is adjusted to the set voltage threshold, a countdown prompt is sent to the preset personnel and a green indicator light is displayed to the protector to be tested. The first mains voltage represents the voltage detected by the protector to be tested after high-voltage protection adjustment; If not, send a green indicator light prompt to the protector to be detected and a start prompt to the relay; The high voltage protection adjustment means sending a prompt to the preset personnel to adjust the high voltage protection voltage through SET.

6. A voltage delay detection method for an over-voltage and under-voltage protector according to claim 1, characterized in that: The specific process of determining whether to trigger an undervoltage response based on the undervoltage delay evaluation coefficient is as follows: Determine whether the undervoltage delay evaluation coefficient is not lower than the reference undervoltage delay threshold obtained from the database: if so, send a red indicator light prompt to the protector to be detected and a shutdown prompt to the relay; Trigger undervoltage response and send prompts to preset personnel to adjust low voltage protection; When the second mains voltage is adjusted to the set voltage threshold, a countdown prompt is sent to the preset personnel and a green indicator light is displayed to the protector to be tested. The second mains voltage represents the voltage detected by the protector to be tested after low voltage protection adjustment; If not, send a green indicator light prompt to the protector to be detected and a start prompt to the relay; The low voltage protection adjustment means sending a prompt to the preset personnel to adjust the low voltage protection voltage through SET.

7. A protection system using the voltage delay detection method for an overvoltage and undervoltage protector according to any one of claims 1 to 6, characterized in that: Includes display hardware, processor, and memory: The display hardware includes a digital tube and a data acquisition device; The processor is used to obtain a voltage fluctuation evaluation coefficient, an overvoltage delay evaluation coefficient and an undervoltage delay evaluation coefficient by processing the voltage change data and the protector trigger delay data; The memory is used to store voltage change data, protector trigger delay data, voltage fluctuation evaluation coefficient, overvoltage delay evaluation coefficient and undervoltage delay evaluation coefficient.

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