Voltage delay detection method and protection system for overvoltage and undervoltage protector

Abstract

The 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 the overvoltage and undervoltage protector in the field comprises the following steps: evaluating voltage fluctuation; performing over-voltage delay evaluation; and carrying out under-voltage delay evaluation. According to the invention, the voltage fluctuation evaluation coefficient is obtained through voltage change evaluation, whether the protector response is triggered or not is judged, and whether the overvoltage response is triggered or not is judged through the obtained overvoltage delay evaluation coefficient when the protector response is triggered. And finally, when the overvoltage response is not triggered, whether the under-voltage response is triggered or not is judged through the obtained under-voltage delay evaluation coefficient, the effect of improving the accuracy of the voltage delay detection of the overvoltage and under-voltage protector is achieved, and the problem that the accuracy of the voltage delay detection of the overvoltage and under-voltage protector is low in the prior art is solved.

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 a protection system for over- and under-voltage protectors. Background Art

[0002] In the power system, many devices have clear requirements for the voltage range. As a key parameter for power transmission and distribution, the stability of voltage is directly related to the normal operation and performance of the equipment. When the voltage is too high, it may cause the internal components of the equipment to be subjected to excessive current and thermal stress, thereby accelerating the aging process and shortening the service life of the equipment. In severe cases, it may even directly cause equipment failure or safety accidents, posing a huge threat to personnel and property. On the contrary, if the voltage is too low, it may not be able to meet the normal power demand of the equipment, causing the equipment to fail to work properly or the performance to drop significantly, which will also have an adverse effect on the overall operating efficiency and stability of the power system. Therefore, a protection device that can detect voltage anomalies and take timely measures is needed. The stability of the power grid is crucial to the normal operation of the power system. Voltage fluctuations will affect the stability of the power grid, and then affect the reliability and safety of the entire power system. Through the voltage delay detection method, voltage anomalies can be detected in time and measures can be taken, which helps to maintain the stability of the power grid.

[0003] Existing methods mainly rely on monitoring the amplitude and frequency of the grid voltage to determine whether overvoltage or undervoltage occurs. When the amplitude of the grid voltage exceeds the preset normal range or the frequency is abnormal, the overvoltage and undervoltage protector will start 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 an 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 with announcement number: CN110932225B announces a method and device for setting overvoltage protection of an ultra-high / ultra-high voltage AC line, including: obtaining a tolerance curve of the equipment over time 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 tolerance curve of the equipment over time 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 overvoltage setting of the power frequency overvoltage protection for each stage of the line; determining the power frequency overvoltage delay of each stage of the line based on the maximum time the equipment can withstand the power frequency overvoltage and the overvoltage operation requirements of the line, and 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 solution 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 prior art, 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 evaluate voltage fluctuations and make timely and effective protection actions based on them, which affects timeliness and leads to the problem of low accuracy in 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- and under-voltage protectors in the prior art by providing a voltage delay detection method and protection system for over- and under-voltage protectors, thereby improving the accuracy of voltage delay detection of over- and under-voltage protectors.

[0009] An embodiment of the present application provides a voltage delay detection method for an over-voltage and under-voltage 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, wherein the voltage fluctuation evaluation coefficient is used to reflect the voltage fluctuation degree of the protector to be detected, wherein the protector to be detected represents a voltage protector with a safety capacitor varistor added thereto; 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, wherein the overvoltage delay evaluation coefficient is used to reflect the delay degree of the protector to be detected under an overvoltage condition; 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, wherein the undervoltage delay evaluation coefficient is used to reflect the delay degree of the protector to be detected under an undervoltage condition.

[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 personnel within a preset time period; the undervoltage protection trigger voltage threshold represents the minimum voltage set by a preset personnel 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 the 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 the voltage fluctuation and the preset maximum voltage fluctuation value obtained from the database; obtaining the initial value of the 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 the voltage fluctuation frequency and the preset voltage fluctuation frequency average value 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] In the formula, It represents 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 the voltage fluctuation of the protector in the qth preset time period, DYPL q represents the initial value of the voltage fluctuation frequency of the protector in the qth preset time period, DYBD0 represents the preset maximum voltage fluctuation value, DYPL0 represents the preset average voltage fluctuation frequency, and e represents a natural constant.

[0015] Furthermore, the specific process of determining whether to trigger a protector response based on the voltage fluctuation evaluation coefficient is as follows: determining whether the voltage fluctuation evaluation coefficient is not lower than a reference voltage fluctuation threshold value obtained from a 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 the voltage fluctuation evaluation coefficient being not lower than the reference voltage fluctuation threshold value obtained from the database.

[0016] Furthermore, the specific process of obtaining the overvoltage delay evaluation coefficient is as follows: obtain 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; obtain 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; obtain 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; combine 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 close 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 obtained from the database: if so, sending a red indicator light prompt to the protector to be detected and a close 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 AC power 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 AC power voltage represents the voltage detected by the protector to be detected 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 over-voltage and under-voltage protector, 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 the present application have at least the following technical effects or advantages:

[0022] 1. The voltage fluctuation evaluation coefficient is obtained by evaluating the voltage change and judging whether the protector response is triggered. Then, when the protector response is triggered, the overvoltage delay evaluation coefficient is used to judge whether the overvoltage response is triggered. Finally, when the overvoltage response is not triggered, the undervoltage delay evaluation coefficient is used to judge whether the undervoltage response is triggered. This improves the reliability of the voltage delay detection of the over- and under-voltage protector, thereby improving the accuracy of the voltage delay detection of the over- and under-voltage protector, and effectively solves the problem of low accuracy of the voltage delay detection of the over- 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 the improvement of the accuracy of the voltage delay detection related data of the over- and undervoltage protector, and then achieving the improvement of the effectiveness of the voltage delay detection of the over- and undervoltage protector.

[0024] 3. By judging whether the voltage fluctuation assessment coefficient is not lower than the reference voltage fluctuation threshold, then judging whether the overvoltage delay assessment coefficient is not lower than the reference overvoltage delay threshold, and finally judging whether the undervoltage delay assessment coefficient is not lower than the reference undervoltage delay threshold, the dynamic detection of the voltage delay of the over-voltage and under-voltage protector is realized, thereby realizing the 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 of changes in the overvoltage protection delay compliance value-overvoltage delay evaluation coefficient provided in an embodiment of the present application;

[0027] Figure 3 An overall flow chart provided for the embodiments of the present 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 an over- and under-voltage protector. The voltage change data corresponding to the protector to be detected is obtained to perform voltage change evaluation to obtain a voltage fluctuation evaluation coefficient, and whether to trigger a protector response is determined based on the voltage fluctuation evaluation coefficient. Then, when the protector response is triggered, an 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 an overvoltage response is not triggered, an 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, and the overall idea is as follows:

[0031] By evaluating the voltage change, the voltage fluctuation assessment coefficient is obtained and it is judged whether the protector response is triggered. Then, when the protector response is triggered, the overvoltage delay assessment coefficient is used to determine whether the overvoltage response is triggered. Finally, when the overvoltage response is not triggered, the undervoltage delay assessment coefficient is used to determine whether the undervoltage response is triggered, thereby achieving the effect of improving the accuracy of 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 in conjunction with the accompanying drawings and specific implementation methods.

[0033] like Figure 1 As shown, it is 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, the method comprising the following steps: S1, voltage fluctuation assessment: obtaining the voltage change data corresponding to the protector to be detected to perform 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 voltage fluctuation degree of the protector to be detected, 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 the obtained protector trigger delay data, judging whether to trigger the overvoltage response based on the overvoltage delay assessment coefficient, the overvoltage delay assessment coefficient is used to reflect the delay degree of the protector to be detected under the overvoltage condition; S3, undervoltage delay assessment: when the overvoltage response is not triggered, the undervoltage delay assessment coefficient is obtained by the obtained protector trigger delay data, judging whether to trigger the undervoltage response based on the undervoltage delay assessment coefficient, the undervoltage delay assessment coefficient is used to reflect the delay degree of the protector to be detected under the undervoltage condition.

[0034] It should be supplemented 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 indicates the maximum voltage detected by the protector within the preset time period; the overvoltage protection trigger voltage threshold indicates the maximum voltage set by the preset personnel within the preset time period; the undervoltage protection trigger voltage threshold indicates the minimum voltage set by the preset personnel within the preset time period; the overvoltage voltage change rate indicates the rate of change of the overvoltage voltage within the preset time period; the undervoltage voltage change rate indicates the rate of change of the undervoltage voltage within the preset time period.

[0035] In this embodiment, the safety capacitor can filter the 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 assessment coefficient, overvoltage delay assessment coefficient and undervoltage delay assessment coefficient of the voltage protector with the safety capacitor varistor are interrelated and interact with each other in the assessment 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, the overvoltage delay assessment coefficient and the undervoltage delay assessment coefficient are used to comprehensively evaluate the performance of the voltage protector; for example, when using a refrigerator, an oven and a microwave oven, the digital tubes set on the refrigerator, the oven and the microwave oven display indicator lights of different colors to reflect different states by evaluating the voltage fluctuation assessment coefficient, the overvoltage delay assessment coefficient and the undervoltage delay assessment coefficient. This improves the accuracy of the voltage delay detection of the 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 with 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, and the voltage signal within a preset time period is monitored by an oscilloscope. 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] Further, the specific process of obtaining the voltage change data corresponding to the protection device to be detected to evaluate the voltage change and obtain the voltage fluctuation evaluation coefficient is as follows: obtaining the initial value of the voltage fluctuation (that is, 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, and 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] In the formula, It represents 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 the voltage fluctuation of the protector in the qth preset time period, DYPL q It indicates the initial value of the voltage fluctuation frequency of the protector in the qth preset time period. It represents 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 of this embodiment combines the voltage change data analysis to obtain the voltage fluctuation assessment coefficient. The voltage change data in the algorithm of this embodiment does not exist independently, and there is a correlation between them. The larger the maximum voltage value, the larger the voltage fluctuation assessment coefficient. The influence of the minimum voltage value and the voltage cycle should also be considered comprehensively. The shorter the voltage cycle, the higher the frequency of voltage change. The change between the maximum and minimum voltage values ​​will be more frequent, indicating that the voltage stability is reduced, because frequent voltage fluctuations may cause equipment failures, grid instability and other problems. The shortening of the voltage cycle may make it difficult for the voltage regulation system in the grid to respond and adjust in time, resulting in an increase in the initial value of the voltage fluctuation frequency, which further leads to an increase in the voltage fluctuation assessment coefficient. The difference between the maximum and minimum voltage values ​​directly reflects the fluctuation range of the voltage. The larger the difference, the more violent the voltage fluctuation, resulting in an increase in the initial value of the voltage fluctuation, which further leads to an increase in the voltage fluctuation assessment coefficient. The change trends of the maximum and minimum voltage values ​​also affect each other. When the maximum voltage increases, if the load in the grid remains unchanged, then the minimum voltage value may increase accordingly. When the maximum voltage increases and the minimum value remains unchanged or decreases, the voltage fluctuation range will expand, 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 over-voltage and under-voltage 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 voltage signal corresponding to the voltage fluctuation evaluation coefficient being not lower than the reference voltage fluctuation threshold obtained from the database (the response in this application indicates that the voltage protector displays different states of the voltage signal monitored by 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); ), 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 result of the ratio operation between 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 overvoltage voltage change rate maximum value 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] Among them, the overvoltage delay evaluation coefficient is obtained by the following method:

[0046]

[0047] In the formula, It represents 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 value, GBL0 represents the preset maximum overvoltage change rate value, and e represents a natural constant.

[0048] In this embodiment, the preset overvoltage delay maximum value is represented by the maximum overvoltage delay value detected by the voltage protector in the historical time period in the database, the preset overvoltage voltage change rate maximum 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 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, it is a statistical diagram of the change of the overvoltage protection delay compliance value-overvoltage delay evaluation coefficient provided in the embodiment of the present application, which is composed of 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 detected under overvoltage conditions gradually increases.

[0050] It should be understood that the algorithm of this embodiment combines the protection device trigger delay data analysis to obtain the overvoltage delay evaluation coefficient. The protection device trigger delay data in the algorithm of this embodiment does not exist independently, but is interrelated. The larger the maximum voltage, the higher the overvoltage delay evaluation coefficient. The influence of the overvoltage voltage change rate and the overvoltage protection trigger voltage threshold should also be considered comprehensively. The larger the overvoltage protection trigger voltage threshold, the smaller the difference between the maximum voltage and the overvoltage protection trigger voltage threshold, resulting in a decrease in the overvoltage protection delay compliance value, which in turn leads to a decrease in the overvoltage delay evaluation coefficient, which means that the system voltage is more likely to reach the level of triggering the protection action, and the voltage protector may respond faster and take measures to prevent the equipment from being damaged by overvoltage. The magnitude of the voltage change rate directly affects the response speed of the voltage protector. The smaller the voltage change rate, the smaller the overvoltage change compliance value, which in turn leads to a decrease in the overvoltage delay evaluation coefficient, which means that the magnitude of the voltage change rate has a smaller impact on the response speed of the voltage protector, and the faster the response speed of the voltage protector. When the voltage change rate is larger, the voltage protector may not be able to respond in time, thereby causing damage to the relay, which in turn causes an increase in 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 over- and under-voltage protector.

[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 result of the ratio operation between 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, 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; the undervoltage delay evaluation coefficient is obtained according to the undervoltage protection delay compliance value and the undervoltage change compliance value.

[0052] Among them, the undervoltage delay evaluation coefficient is obtained by the following method:

[0053]

[0054] In the formula, It represents 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 represents the undervoltage voltage change rate of the protector in the qth preset time period, QYF0 represents the preset undervoltage delay maximum value, QBL0 represents the preset undervoltage voltage change rate maximum value, 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 meets 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] It can be seen from the above table that 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 detected under undervoltage conditions gradually increases.

[0060] It should be understood that the algorithm of this embodiment combines the protector trigger delay data analysis to obtain the undervoltage delay evaluation coefficient. The protector trigger delay data in the algorithm of this embodiment does not exist independently, but is interrelated. The larger the undervoltage protection trigger voltage threshold, it does not mean that the undervoltage delay evaluation coefficient is larger. The influence of the undervoltage voltage change rate and the minimum voltage value should also be considered comprehensively. 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 voltage change rate directly affects the response speed of the voltage protector. The larger the undervoltage voltage change rate, the greater the undervoltage change compliance value, which may lead to 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, 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 then 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: judge whether the overvoltage delay evaluation coefficient is not lower than the reference overvoltage delay threshold obtained from the database: if so, send a red indicator light prompt to the protector to be detected and a close prompt to the relay; trigger an overvoltage response and send 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, send a start countdown prompt to the preset personnel and display a green indicator light prompt to the protector to be detected, and the first AC power voltage represents the voltage detected by the protector to be detected after the 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; high-voltage protection adjustment indicates 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 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 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 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 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 obtained from the database: if so, sending a red indicator light prompt to the protector to be detected and a close 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 AC power 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 AC power voltage indicates the voltage detected by the protector to be detected 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.

[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, 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, it 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 the overvoltage condition. The undervoltage delay assessment module obtains an overvoltage delay assessment coefficient reflecting the delay degree of the protector to be detected under the undervoltage condition. 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 a protection system for an application such as a voltage delay detection method for an over-voltage and under-voltage 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 the triggered protector response, the triggered overvoltage response and the triggered undervoltage response; the data acquisition device includes an oscilloscope and a data acquisition card, 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. 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, it 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 the relay are working normally.

[0068] To summarize, the embodiment of the present application obtains the voltage fluctuation assessment coefficient by performing a voltage change assessment and determines whether to trigger the protector response, and then determines whether to trigger the overvoltage response by using the obtained overvoltage delay assessment 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 assessment coefficient, thereby improving the reliability of the voltage delay detection of the over- and under-voltage protector, and further improving the accuracy of the voltage delay detection of the over- and under-voltage protector, effectively solving the problem of low accuracy of the voltage delay detection of the over- and under-voltage protector in the prior art.

[0069] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, 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 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 flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, 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 flowchart and / or block diagram. 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 capable of directing a computer or other programmable data processing device to operate 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 A 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 operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0073] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other 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 can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

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 the 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 the protector response based on the voltage fluctuation evaluation coefficient, wherein the voltage fluctuation evaluation coefficient is used to reflect the voltage fluctuation degree 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 is triggered to respond, the overvoltage delay evaluation coefficient is obtained by the acquired protector trigger delay data, and whether to trigger the overvoltage response is determined based on the overvoltage delay evaluation coefficient, wherein the overvoltage delay evaluation coefficient is used to reflect the delay degree of the protector to be detected under the overvoltage condition; S3, when the overvoltage response is not triggered, the undervoltage delay evaluation coefficient is obtained by obtaining the protector trigger delay data, and whether to trigger the undervoltage response is determined 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 the undervoltage condition.

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

3. A voltage delay detection method for an over-voltage and under-voltage protector as claimed in claim 2, characterized in that: 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: Acquire 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; Acquire 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, wherein the voltage fluctuation frequency compliance value is represented by a result of a ratio operation between an initial value of the voltage fluctuation frequency and a preset voltage fluctuation frequency average value obtained from a database; The voltage fluctuation evaluation coefficient is obtained through the voltage fluctuation compliance value and the voltage fluctuation frequency compliance value.

4. A voltage delay detection method for an over-voltage and under-voltage protector as claimed in claim 3, characterized in that: The limiting expression of the voltage fluctuation assessment coefficient is as follows: In the formula, It represents 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 the voltage fluctuation of the protector in the qth preset time period, DYPL q represents the initial value of the voltage fluctuation frequency of the protector in the qth preset time period, DYBD0 represents the preset maximum voltage fluctuation value, DYPL0 represents the preset average voltage fluctuation frequency, and e represents a natural constant.

5. 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 judging 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 the voltage signal corresponding to when the voltage fluctuation evaluation coefficient is not lower than the reference voltage fluctuation threshold value obtained from the database.

6. 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 obtaining the overvoltage delay evaluation coefficient is as follows: Obtaining an initial overvoltage protection delay time, wherein the initial overvoltage protection delay time is represented by a result of a ratio operation between 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, wherein the overvoltage protection delay compliance value is represented by a result of a ratio operation between an initial overvoltage protection delay time and a preset overvoltage delay maximum value obtained from a database; Obtaining an overvoltage change compliance value, wherein the overvoltage change compliance value is represented by a result of a ratio operation between an overvoltage voltage change rate and a preset overvoltage voltage change rate maximum value obtained from a database; The overvoltage protection delay compliance value and the overvoltage change compliance value are combined to obtain the overvoltage delay evaluation coefficient.

7. 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 obtaining the undervoltage delay evaluation coefficient is as follows: Obtaining an initial undervoltage protection delay time, wherein the initial undervoltage protection delay time is represented by a result of a ratio operation between a difference between an undervoltage protection trigger voltage threshold and a voltage minimum 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 result of a ratio operation between an initial undervoltage protection delay time and a preset undervoltage delay maximum value obtained from a database; Obtaining an undervoltage change compliance value, wherein the undervoltage change compliance value is represented by a result of a ratio operation between 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.

8. A voltage delay detection method for an over-voltage and under-voltage protector as claimed in claim 6, characterized in that: The specific process of judging 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 so, 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 make high voltage protection adjustments; When the first mains voltage detected by the protector to be tested is adjusted to the set voltage threshold, a start countdown prompt is sent to the preset personnel and a green indicator light prompt is displayed to the protector to be tested, wherein the first mains voltage represents the voltage detected by the protector to be tested after the 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.

9. A voltage delay detection method for an over-voltage and under-voltage protector as claimed in claim 7, characterized in that: The specific process of judging 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 make low voltage protection adjustments; When the second mains voltage is adjusted to the set voltage threshold, a start countdown prompt is sent to the preset personnel and a green indicator light prompt is displayed to the protector to be tested. The second mains voltage represents the voltage detected by the protector to be tested after the 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.

10. A protection system using the voltage delay detection method for an over-voltage or under-voltage protector as claimed in any one of claims 1 to 9, 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 assessment coefficient, an overvoltage delay assessment coefficient and an undervoltage delay assessment coefficient by processing the voltage change data and the protector trigger delay data; The memory is used to store voltage variation data, protector trigger delay data, voltage fluctuation evaluation coefficient, overvoltage delay evaluation coefficient and undervoltage delay evaluation coefficient.

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