Box transformer and cable trench water level monitoring system and method

Abstract

The application belongs to the technical field of water level monitoring, and particularly relates to a box transformer and cable trench water level monitoring system and method, which comprises monitoring a box transformer cable trench, collecting box transformer cable trench data information, and acquiring water level data of the box transformer cable trench through the data information, wherein the data information comprises water level height, air humidity, water inflow and environmental temperature in the box transformer cable trench, the water level data comprises water level rising height per unit time, and the water level of the box transformer cable trench is predicted through the collected data information and calculated water level height correlation value of the box transformer cable trench when it rains; the safety value of the box transformer cable trench is calculated according to the predicted value of the water level of the box transformer cable trench; when the predicted water level exceeds the water level threshold, the box transformer cable trench is processed according to the predicted water level value and the safety value, and the real-time water level height, air humidity, water inflow, environmental temperature and safety value of the i-th box transformer cable trench are displayed in real time.

Description

Technical Field

[0001] This invention relates to the field of water level monitoring technology, specifically to a water level monitoring system and method for transformer substations and cable trenches. Background Technology

[0002] With the continuous development of society and the economy, people's living standards have also improved significantly. This improvement directly impacts the demand for electricity. To ensure the maximum guarantee of electricity supply, the normal operation of substations is crucial. However, substations encounter various problems during operation, including equipment malfunctions and the impact of water accumulation. Currently, the most commonly used substation type is the prefabricated substation. When rain falls, if the cable trench covers are not properly sealed, water can accumulate at the bottom of the substation, increasing internal humidity and causing condensation on cable joints, switches, transformers, and other power supply equipment. This leads to equipment aging, and water treeing can occur on cables after immersion in water, reducing insulation and potentially causing cable breakdown. Therefore, after each heavy rain, it is necessary to check the water accumulation in each prefabricated substation. However, manually checking for water accumulation in prefabricated substations is both time-consuming and labor-intensive. Summary of the Invention

[0003] The purpose of this invention is to provide a water level monitoring system and method for transformer substations and cable trenches to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for monitoring water levels in transformer substations and cable trenches, the method comprising:

[0005] Step S100: Monitor the cable trench of the transformer substation and collect data information of the cable trench; the data information includes the water level height, air humidity, water inflow, and ambient temperature in the cable trench; obtain the water level data of the cable trench through the data information; the water level data includes the water level rise height per unit time;

[0006] Step S200: When rainfall occurs, the water level in the cable trench of the transformer substation is predicted by collecting data from the trench.

[0007] Step S300: Calculate the safety value of the cable trench for the transformer substation based on the predicted water level height.

[0008] Step S400: When the predicted water level is detected to exceed the water level threshold, the cable trench of the transformer substation is processed according to the predicted water level value and the safety value.

[0009] Furthermore, step S100 includes:

[0010] Step S101: During the monitoring period, monitor the water level of the cable trench of the i-th transformer substation at unit time intervals, record and collect the collected water level data to obtain the set H = {H i1 H i2 ,...,H if}, where H i1 H i2 ,...,H if Let H represent the water level height data collected in the cable trench of the i-th transformer substation within the 1st, 2nd, ..., fth time units. The collected water level height set H is then filtered, removing data with water levels below the detection threshold, resulting in set H. Z ={H i1 H i2 ,...,H ir}; where H i1 H i2 ,...,H ir Representing sets respectively The water level heights of the 1st, 2nd, ..., rth substation cable trenches that are greater than the water level detection threshold;

[0011] Step S102: Set H Z The water level heights in the trenches are subtracted sequentially to obtain several data points corresponding to the water level changes in the i-th transformer substation cable trench. These data points are then recorded and compiled to obtain a set L = {L...} i1 ,L i2 ,...,L in}, where L i1 ,L i2 ,...,L in These represent the water level height changes in the cable trenches of the 1st, 2nd, ..., nth transformer substations.

[0012] Furthermore, step S200 includes:

[0013] Step S201: Calculate the water level height correlation value D of the i-th transformer substation cable trench. i :

[0014] ,

[0015] Among them, L ix Let be the x-th water level change value of the i-th transformer cable trench in set L; n be the number of water level changes in the i-th transformer cable trench in set L; and x be the number of water level changes in set L. ix The corresponding number of water level changes;

[0016] Step S202: When rainfall occurs, the expected water level H of the cable trench of the i-th transformer substation is calculated by analysis at the end of the j-th unit time. ij :

[0017] ,

[0018] Among them, H ij-1 denoted as , where is the water level height of the i-th transformer cable trench at the end of the j-th unit time; μ is the rainfall influencing factor obtained by collecting data on the pressure belt, latitude, and topographic analysis of the location of the i-th transformer cable trench.

[0019] In the above steps, the water level rise height of the i-th transformer cable trench per unit time is used to calculate the correlation value D of the water level height in the i-th transformer cable trench. i This is because if the recorded water level rise in the transformer substation cable trench is higher and the number of rises is more frequent, it indicates that the area where the cable trench is located is frequently affected by rainfall. This is used to predict the expected water level H that the i-th transformer substation cable trench will reach at the end of the j-th unit of time. ij This is to prepare in advance for rising water levels and avoid impacting the cable trench of the transformer substation.

[0020] Furthermore, step S300 includes:

[0021] Step S301: Randomly select n locations within the cable trench of the i-th transformer substation to collect air humidity data. Record and aggregate the collected n air humidity values ​​to obtain a set P = {P i1 ,P i2 ,...,P in}; where P i1 ,P i2 ,...,P in Take the air humidity values ​​at the 1st, 2nd, ..., nth random locations within the cable trench of the i-th transformer substation, and let P be the value of the air humidity. i1 ,P i2 ,...,P in MedianP it Let P be the air humidity test value of the i-th transformer cable trench. it For set P, P i1 ,P i2 ,...,P in Filter, select P from set P i1 ,P i2 ,...,P in air humidity test value P it Take the absolute value of the difference, and discard the air humidity values ​​that are greater than the air humidity test threshold to obtain set P. iO Calculate set P iOThe average value is used to obtain the air humidity P in the cable trench of the i-th transformer substation. i ;

[0022] Step S302: Calculate the expected water level H to be reached at the end of the j-th unit time for the i-th transformer cable trench. ij Air humidity P i Ambient temperature T i Normalization was performed on each data point, and a linear transformation was applied to the original data to map it to the range [0,1]; this yielded the water level height H. i Normalized mapping value H gij The air humidity P is obtained. i Normalized mapping value P gi ; Obtain the ambient temperature Normalized mapping value T gi ;

[0023] Step S303: Calculate the safety value Q of the i-th transformer substation cable trench. i :

[0024] ,

[0025] Where β is P i Influencing factors; γ is T i Influencing factors; ε is H i Influencing factors;

[0026] The safety values ​​of the transformer substation cable trench are calculated based on the water level, air humidity, and ambient temperature in the above steps because the usability of the transformer substation cable trench during operation largely depends on these three factors. For example, if the cable is soaked in water, "water trees" will appear, reducing insulation and potentially causing cable breakdown. Sustained high temperatures will increase the working pressure on the cable, and excessively high cable temperatures will damage its performance, easily leading to insulation breakdown. Once this occurs, the cable insulation layer will be damaged, making it prone to short circuits with other cables and causing power outages and other power supply failures, thus failing to guarantee normal power transmission. Excessive air humidity in the transformer substation cable trench will reduce internal insulation resistance, greatly increase leakage current of the equipment, and may even cause insulation breakdown.

[0027] Furthermore, step S400 includes:

[0028] Step S401: When the calculated water level H of the i-th transformer cable trench is expected to reach at the end of the j-th unit time... ij When the water level in the cable trench exceeds the threshold value, processing begins for the i-th cable trench. iIf the value is less than the minimum safety threshold for the cable trench of the transformer substation, the automatic drainage device is activated to drain the i-th transformer substation cable trench; when the safety value Q of the i-th transformer substation cable trench... i When the value of the cable trench exceeds the minimum safety threshold but is less than the maximum safety threshold, the automatic drainage device is activated to drain the i-th cable trench and an alarm is triggered to alert staff for handling. i When the value exceeds the maximum safety threshold of the cable trench of the transformer substation, the automatic drainage device is activated to drain the i-th transformer substation cable trench, the power supply to the i-th transformer substation cable trench is cut off, and an alarm is issued to remind the staff to handle the situation.

[0029] Step S402: When the automatic drainage device is turned on to drain the cable trench of the transformer substation, the water level in the cable trench does not drop; the height of the water surface in the water collection well of the transformer substation cable trench and the height of the wellhead sensor are obtained. When the height is less than the height threshold, it indicates that the water collection capacity of the water collection well of the transformer substation cable trench has decreased, and an abnormal alarm is issued to remind the staff to deal with the water collection well of the transformer substation cable trench.

[0030] Step S403: Display the real-time water level, air humidity, water inflow, ambient temperature, and safety value of the cable trench of the i-th transformer substation in real time;

[0031] In the above steps, when the predicted water level in the transformer substation cable trench is higher than the actual water level, the trench is drained because a high water level may submerge the cables in the trench, necessitating drainage. The transformer substation cable trench is treated according to different safety values, and this tiered treatment makes the handling of water level conditions in the transformer substation cable trench more practical.

[0032] To better implement the above methods, a water level monitoring system for transformer substations and cable trenches is also proposed. The monitoring system includes a monitoring module, a water level prediction module, a safety module, and a processing module.

[0033] The monitoring module is used to monitor the cable trench of the transformer substation and collect data information from the cable trench, including water level, air humidity, water inflow, and ambient temperature.

[0034] The water level prediction module is used to predict the water level in the cable trench of the transformer substation.

[0035] The safety module is used to calculate the safety values ​​for the cable trench of the transformer substation.

[0036] The processing module is used to process the cable trenches of the transformer substation based on the predicted water level and safety value.

[0037] Furthermore, the monitoring module includes a data acquisition unit and a data processing unit;

[0038] The data acquisition unit is used to monitor the i-th transformer substation cable trench and collect the water level height H of the i-th transformer substation cable trench. i Air humidity P i Ambient temperature T i ;

[0039] The data processing unit processes the collected data, records and aggregates the water level rise over n unit time intervals, resulting in a set L = {L i1 ,L i2 ,...,L in}

[0040] Furthermore, the water level prediction module includes a water level calculation unit;

[0041] The water level calculation unit is used to correlate the water level height D of the i-th transformer substation cable trench. i Calculations are performed to determine the expected water level H at the end of the j-th unit time based on the calculated water level height correlation value. ij .

[0042] Furthermore, the security module includes a security value data processing unit and a security value calculation unit;

[0043] The safety value data processing unit is used to calculate the expected water level H at the end of the j-th unit time for the i-th transformer cable trench. ij Air humidity P i Ambient temperature T i Normalization is performed on each data point, and a linear transformation is applied to the original data to map it to the range [0,1].

[0044] The safety value calculation unit is used to calculate the safety value of the i-th transformer cable trench at the end of the j-th unit time.

[0045] Furthermore, the processing module includes a processing unit and a display unit;

[0046] The processing unit is used to process the i-th transformer cable trench. When the water level of the i-th transformer cable trench exceeds the threshold of the i-th transformer cable trench, the i-th transformer cable trench is processed according to the relationship between the safety value and the safety value threshold of the i-th transformer cable trench.

[0047] The display unit is used to display the real-time water level, air humidity, water inflow, ambient temperature, and safety values ​​of the i-th transformer cable trench.

[0048] Compared with the prior art, the beneficial effects achieved by the present invention are: the present invention monitors the i-th transformer cable trench and collects the water level height H of the i-th transformer cable trench. iAir humidity P i Ambient temperature T i This is because the usability of a transformer substation cable trench largely depends on three factors: water level, air humidity, and ambient temperature. The correlation value D of the water level in the i-th transformer substation cable trench is calculated by measuring the rise in water level per unit time. i This is because if the recorded water level rise in the transformer substation cable trench is higher and the number of rises is more frequent, it indicates that the area where the transformer substation cable trench is located is frequently affected by rainfall. The graded treatment of the transformer substation cable trench makes the management of the water level in the transformer substation cable trench more in line with real life. Attached Figure Description

[0049] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0050] Figure 1 This is a flowchart of the water level monitoring system and method for transformer substations and cable trenches of the present invention;

[0051] Figure 2 This is a system structure diagram of the water level monitoring system and method for transformer substations and cable trenches of the present invention. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Please see Figures 1-2 The present invention provides a technical solution: a method for monitoring water levels in transformer substations and cable trenches, characterized in that the method includes:

[0054] Step S100: Monitor the cable trench of the transformer substation and collect data information of the cable trench; the data information includes the water level height, air humidity, water inflow, and ambient temperature in the cable trench; obtain the water level data of the cable trench through the data information; the water level data includes the water level rise height per unit time;

[0055] Step S100 includes:

[0056] Step S101: During the monitoring period, monitor the water level of the cable trench of the i-th transformer substation at unit time intervals, record and collect the collected water level data to obtain the set H = {H i1 Hi2 ,...,H if}, where H i1 H i2 ,...,H if Let H represent the water level height data collected in the cable trench of the i-th transformer substation within the 1st, 2nd, ..., fth time units. The collected water level height set H is then filtered, removing data with water levels below the detection threshold, resulting in set H. Z ={H i1 H i2 ,...,H ir}; where H i1 H i2 ,...,H ir Representing sets respectively The water level heights of the 1st, 2nd, ..., rth substation cable trenches that are greater than the water level detection threshold;

[0057] Step S102: Set H Z The water level heights in the trenches are subtracted sequentially to obtain several data points corresponding to the water level changes in the i-th transformer substation cable trench. These data points are then recorded and compiled to obtain a set L = {L...} i1 ,L i2 ,...,L in}, where L i1 ,L i2 ,...,L in These represent the water level height changes in the cable trenches of the 1st, 2nd, ..., nth transformer substations.

[0058] Step S200: When rainfall occurs, the water level in the cable trench of the transformer substation is predicted by collecting data from the trench.

[0059] Step S200 includes:

[0060] Step S201: Calculate the water level height correlation value D of the i-th transformer substation cable trench. i :

[0061] ,

[0062] Among them, L ix Let be the x-th water level change value of the i-th transformer cable trench in set L; n be the number of water level changes in the i-th transformer cable trench in set L; and x be the number of water level changes in set L. ix The corresponding number of water level changes;

[0063] Step S202: When rainfall occurs, the expected water level H of the cable trench of the i-th transformer substation is calculated by analysis at the end of the j-th unit time.ij :

[0064] ,

[0065] Among them, H ij-1 denoted as , where is the water level height of the i-th transformer cable trench at the end of the j-th unit time; μ is the rainfall influencing factor obtained by collecting data on the pressure belt, latitude, and topographic analysis of the location of the i-th transformer cable trench.

[0066] Step S300: Calculate the safety value of the cable trench for the transformer substation based on the predicted water level height.

[0067] Step S300 includes:

[0068] Step S301: Randomly select n locations within the cable trench of the i-th transformer substation to collect air humidity data. Record and aggregate the collected n air humidity values ​​to obtain a set P = {P i1 ,P i2 ,...,P in}; where P i1 ,P i2 ,...,P in Take the air humidity values ​​at the 1st, 2nd, ..., nth random locations within the cable trench of the i-th transformer substation, and let P be the value of the air humidity. i1 ,P i2 ,...,P in MedianP it Let P be the air humidity test value of the i-th transformer cable trench. it For set P, P i1 ,P i2 ,...,P in Filter, select P from set P i1 ,P i2 ,...,P in air humidity test value P it Take the absolute value of the difference, and discard the air humidity values ​​that are greater than the air humidity test threshold to obtain set P. iO Calculate set P iO The average value is used to obtain the air humidity P in the cable trench of the i-th transformer substation. i ;

[0069] Step S302: Calculate the expected water level H to be reached at the end of the j-th unit time for the i-th transformer cable trench. ij Air humidity P i Ambient temperature T i Normalization was performed on each data point, and a linear transformation was applied to the original data to map it to the range [0,1]; this yielded the water level height H. i Normalized mapping value Hgij The air humidity P is obtained. i Normalized mapping value P gi ; Obtain the ambient temperature Normalized mapping value T gi ;

[0070] Step S303: Calculate the safety value Q of the i-th transformer substation cable trench. i :

[0071] ,

[0072] Where β is P i Influencing factors; γ is T i Influencing factors; ε is H i Influencing factors;

[0073] For example, the mapped value of the water level height expected to reach at the end of the third transformer cable trench at the end of the third unit time is H. g33 The mapping value P, which is 0.7 and normalized to air humidity. g3 The mapped value T after normalization of ambient temperature is 0.6. g3 β is 0.4; γ is 0.4; ε is 0.5; the safety value of the cable trench of the third transformer substation is Q3 = 0.4 × 0.6 + 0.5 × 0.4 + 0.7 × 0.7 = 0.93;

[0074] Step S400: When the predicted water level is detected to exceed the water level threshold, the cable trench of the transformer substation is processed according to the predicted water level value and the safety value;

[0075] Step S400 includes:

[0076] Step S401: When the calculated water level H of the i-th transformer cable trench is expected to reach at the end of the j-th unit time... ij When the water level in the cable trench exceeds the threshold value, processing begins for the i-th cable trench. i If the value is less than the minimum safety threshold for the cable trench of the transformer substation, the automatic drainage device is activated to drain the i-th transformer substation cable trench; when the safety value Q of the i-th transformer substation cable trench... i When the value of the cable trench exceeds the minimum safety threshold but is less than the maximum safety threshold, the automatic drainage device is activated to drain the i-th cable trench and an alarm is triggered to alert staff for handling. i When the value exceeds the maximum safety threshold of the cable trench of the transformer substation, the automatic drainage device is activated to drain the i-th transformer substation cable trench, the power supply to the i-th transformer substation cable trench is cut off, and an alarm is issued to remind the staff to handle the situation.

[0077] Step S402: When the automatic drainage device is turned on to drain the cable trench of the transformer substation, the water level in the cable trench does not drop; the height of the water surface in the water collection well of the transformer substation cable trench and the height of the wellhead sensor are obtained. When the height is less than the height threshold, it indicates that the water collection capacity of the water collection well of the transformer substation cable trench has decreased, and an abnormal alarm is issued to remind the staff to deal with the water collection well of the transformer substation cable trench.

[0078] Step S403: Display the real-time water level, air humidity, water inflow, ambient temperature, and safety value of the cable trench of the i-th transformer substation in real time;

[0079] To better implement the above methods, a water level monitoring system for transformer substations and cable trenches is also proposed. The monitoring system includes a monitoring module, a water level prediction module, a safety module, and a processing module.

[0080] The monitoring module is used to monitor the cable trench of the transformer substation and collect data information from the cable trench, including water level, air humidity, water inflow, and ambient temperature.

[0081] The water level prediction module is used to predict the water level in the cable trench of the transformer substation.

[0082] The safety module is used to calculate the safety values ​​for the cable trench of the transformer substation.

[0083] The processing module is used to process the cable trenches of the transformer substation based on the predicted water level and safety value.

[0084] The monitoring module includes a data acquisition unit and a data processing unit.

[0085] The data acquisition unit is used to monitor the i-th transformer substation cable trench and collect the water level height H of the i-th transformer substation cable trench. i Air humidity P i Ambient temperature T i ;

[0086] The data processing unit processes the collected data, records and aggregates the water level rise over n unit time intervals, resulting in a set L = {L i1 ,L i2 ,...,L in}

[0087] The water level prediction module includes a water level calculation unit.

[0088] The water level calculation unit is used to correlate the water level height D of the i-th transformer substation cable trench. i Calculations are performed to determine the expected water level H at the end of the j-th unit time based on the calculated water level height correlation value. ij .

[0089] The security module includes a security value data processing unit and a security value calculation unit.

[0090] The safety value data processing unit is used to calculate the expected water level H at the end of the j-th unit time for the i-th transformer cable trench. ij Air humidity P i Ambient temperature T i Normalization is performed on each data point, and a linear transformation is applied to the original data to map it to the range [0,1].

[0091] The safety value calculation unit is used to calculate the safety value of the i-th transformer cable trench at the end of the j-th unit time.

[0092] The processing module includes a processing unit and a display unit;

[0093] The processing unit is used to process the i-th transformer cable trench. When the water level of the i-th transformer cable trench exceeds the threshold of the i-th transformer cable trench, the i-th transformer cable trench is processed according to the relationship between the safety value and the safety value threshold of the i-th transformer cable trench.

[0094] The display unit is used to display the real-time water level, air humidity, water inflow, ambient temperature, and safety values ​​of the i-th transformer cable trench.

[0095] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0096] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for monitoring the water level of a box transformer and a cable trench, characterized by, The method comprises: Step S100: monitoring the box transformer cable trench, collecting the data information of the box transformer cable trench; the data information comprises water level height, air humidity, water inflow, and environmental temperature in the box transformer cable trench; water level data of the box transformer cable trench is obtained through the data information; the water level data comprises water level rising height per unit time; Step S200: when it rains, the water level of the box transformer cable trench is predicted through the collected data information in the box transformer cable trench; Step S300: according to the water level height prediction value of the box transformer cable trench, the safety value of the box transformer cable trench is calculated; Step S400: when it is monitored that the predicted water level exceeds the water level threshold value, the box transformer cable trench is processed according to the predicted water level value and the safety value; The step S200 comprises: Step S201: Calculate the water level height correlation value D of the i-th box transformer cable trench i : ， wherein L ix is the xth water level change value of the ith box transformer cable trench in the set L; n is the number of water level changes of the ith box transformer cable trench in the set L; x is the corresponding number of water level changes in the set L ix . Step S202: When it rains, the water level height H expected to arrive at the end of the jth unit time of the ith box transformer cable trench is calculated by analysis ij : , where H ij-1 is the water level height of the i-th box transformer cable trench at the end of the j-th unit time; μ is the rainfall influence factor obtained by collecting the atmospheric pressure zone, latitude position, and terrain of the i-th box transformer cable trench to analyze the local rainfall; The step S300 comprises: Step S301: Randomly select n locations within the cable trench of the i-th transformer substation to collect air humidity data. Record and aggregate the collected n air humidity values ​​to obtain a set P = {P i1 ,P i2 ,...,P in }; where P i1 ,P i2 ,...,P in The air humidity values ​​at the 1st, 2nd, ..., nth random locations within the cable trench of the i-th transformer substation are given, and P is taken as the value. i1 ,P i2 ,...,P in MedianP it Let P be the air humidity test value of the i-th transformer cable trench. it For set P, P i1 ,P i2 ,...,P in Filter, select P from set P i1 ,P i2 ,...,P in The air humidity test value P it Take the absolute value of the difference, and discard any air humidity values ​​whose absolute value is greater than the air humidity test threshold to obtain set P. iO Calculate set P iO The average value is used to obtain the air humidity P in the cable trench of the i-th transformer substation. i ; Step S302: The water level height H expected to arrive at the end of the jth unit time of the ith box substation cable trench ij , air humidity P i , ambient temperature T i , respectively, the original data is linearly transformed, and the data is mapped to [0, 1]; obtain the water level height H i , the mapping value H of the normalization processing gij , obtain the air humidity P i , the mapping value P of the normalization processing gi ; obtain the ambient temperature , the mapping value T of the normalization processing gi ; Step S303: Calculate the safety value Q of the i-th box transformer cable trench i : ， wherein β is the influence factor of P i γ is the influence factor of T i ε is the influence factor of H i .

2. The method according to claim 1, wherein, The step S100 comprises: Step S101: monitoring the water level height of the i-th box transformer cable trench every interval unit time in the monitoring period, recording the collected water level height, and obtaining a set H={H i1 ,H i2 ,...,H if}, wherein H i1 ,H i2 ,...,H if represent the water level height data collected in the first, second,..., f-th unit time of the i-th box transformer cable trench, respectively; filtering the collected water level height set H, and removing the water level height less than the water level height detection threshold to obtain a set H Z ={H i1 ,H i2 ,...,H ir}; wherein H i1 ,H i2 ,...,H ir represent the first, second,..., r-th water level height greater than the water level height detection threshold in the set ; Step S102: sequentially subtract the water level heights in set H Z to obtain a plurality of water level change height data corresponding to the i-th box transformer cable trench, record and collect the water level change height of the i-th box transformer cable trench to obtain set L={L i1 , L i2 ,...,L in}, wherein L i1 , L i2 ,...,L in respectively represent the water level change values of the 1st, 2nd,..., n-th i-th box transformer cable trench.

3. The method according to claim 2, wherein, The step S400 comprises: Step S401: When the calculated water level height H of the ith box transformer cable trench at the end of the jth unit time is expected to reach ij greater than the threshold value of the box transformer cable trench water level height, start processing the ith box transformer cable trench; when the safety value Q of the ith box transformer cable trench i less than the minimum threshold value of the box transformer cable trench safety value, open the automatic drainage device, and drain the ith box transformer cable trench; when the safety value Q of the ith box transformer cable trench i greater than the minimum threshold value of the box transformer cable trench safety value and less than the maximum threshold value of the safety value, open the automatic drainage device, drain the ith box transformer cable trench, and issue an alarm to remind the staff to handle; when the safety value Q of the ith box transformer cable trench i greater than the maximum threshold value of the box transformer cable trench safety value, open the automatic drainage device to drain the ith box transformer cable trench, cut off the power supply to the ith box transformer cable trench, and issue an alarm to remind the staff to handle; Step S402: when the automatic drainage device is opened, the box transformer cable trench is drained, and the water level of the box transformer cable trench does not decrease; the height of the water surface in the catch basin of the box transformer cable trench and the well mouth sensor is obtained; when the height is less than the height threshold value, it indicates that the catch basin of the box transformer cable trench has decreased catch basin capacity, an abnormal alarm is sent, and the staff is prompted to process the catch basin of the box transformer cable trench; Step S403: the real-time water level height, air humidity, water inflow, environmental temperature, and safety value of the i-th box transformer cable trench are displayed in real time.

4. The box transformer and cable trench water level monitoring system applied to the box transformer and cable trench water level monitoring method of any one of claims 1-3, characterized in that, The monitoring system comprises a monitoring module, a water level prediction module, a safety module, and a processing module; The monitoring module is used for monitoring the box transformer cable trench and collecting data information of the box transformer cable trench; the data information comprises water level height, air humidity, water inflow, and environmental temperature in the box transformer cable trench; The water level prediction module is used for predicting the water level of the box transformer cable trench; The safety module is used for calculating the safety value of the box transformer cable trench; The processing module is used for processing the box transformer cable trench according to the predicted water level and safety value.

5. The box transformer and cable trench water level monitoring system of claim 4, wherein, The monitoring module comprises a data acquisition unit and a data processing unit; The data acquisition unit is used for monitoring the i-th box transformer cable trench and acquiring the water level height H of the i-th box transformer cable trench i , air humidity P i , ambient temperature T i ; The data processing unit is used for processing the collected data, recording and collecting n unit time water level rising heights, and obtaining a set L={L i1 , L i2 , ..., L in}.

6. The box transformer and cable trench water level monitoring system of claim 4, wherein, The water level prediction module comprises a water level calculation unit; The water level calculation unit is configured to associate the water level height of the i-th box cable trench with a value D i The water level height H of the j-th unit time is calculated according to the calculated water level height association value D ij .

7. The box transformer and cable trench water level monitoring system of claim 4, wherein, The safety module comprises a safety value data processing unit and a safety value calculation unit; The safety value data processing unit is configured to normalize the water level height H of the i-th box transformer cable trench at the end of the j-th unit time ij , air humidity P i , ambient temperature T i respectively, normalize the original data, perform linear transformation on the data, and map the data to [0, 1]. The safety value calculation unit is used for calculating the safety value of the i-th box transformer cable trench at the end of the j-th unit time. 8.The box transformer and cable trench water level monitoring system according to claim 4, characterized in that, The processing module comprises a processing unit and a display unit; The processing unit is used for processing the i-th box transformer cable trench; when the water level height of the i-th box transformer cable trench exceeds the threshold value of the i-th box transformer cable trench, the i-th box transformer cable trench is processed according to the relationship between the safety value of the i-th box transformer cable trench and the safety value threshold value; The display unit is used for displaying the real-time water level height, air humidity, water inflow, environmental temperature, and safety value of the i-th box transformer cable trench in real time.

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