A partial discharge monitoring system for ring main unit based on data analysis

Abstract

The invention discloses a partial discharge monitoring system for a ring main unit based on data analysis, relates to the technical field of partial discharge monitoring of ring main units, and solves the technical problem in the prior art that the ring main unit cannot accurately monitor partial discharge during power operation, and cannot perform defect analysis on insulation parts during the partial discharge process. Specifically, a partial discharge analysis unit performs partial discharge analysis on the ring main unit, obtains power data and duration data, substitutes the power data and duration data into a formula to obtain a partial discharge analysis coefficient, generates a high partial discharge signal or a low partial discharge signal according to a comparison of the partial discharge analysis coefficient threshold, and sends it to a discharge monitoring platform; an insulation defect analysis unit performs insulation defect analysis on the ring main unit that has completed the partial discharge analysis, obtains defect length data within the power operation period, generates a defect instantaneous impact signal or a defect continuous impact signal according to a comparison of the defect length data, and sends it to the discharge monitoring platform.

Description

Technical Field

[0001] The invention relates to the technical field of partial discharge monitoring of ring main unit, and in particular to a partial discharge monitoring system of a ring main unit based on data analysis. Background Art

[0002] A ring main unit is an electrical device consisting of a group of high-voltage switchgear installed in a steel plate metal cabinet or made into an assembled interval ring main unit. Its core part uses load switches and fuses. It has the advantages of simple structure, small size, low price, improved power supply parameters and performance, and power supply safety.

[0003] However, in the prior art, partial discharge cannot be accurately monitored when the ring main unit is in power operation, and defect analysis of the insulation parts cannot be performed during the partial discharge process, so that targeted partial discharge control cannot be performed. In addition, partial discharge cannot be predicted based on the insulation parts inside the ring main unit.

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems and to propose a partial discharge monitoring system for a ring main unit based on data analysis.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A partial discharge monitoring system for a ring main unit based on data analysis, comprising a discharge monitoring platform, wherein the discharge monitoring platform is communicatively connected to a partial discharge analysis unit, an insulation defect analysis unit and a partial discharge prediction analysis unit;

[0008] The partial discharge analysis unit performs partial discharge analysis on the ring main unit, obtains power data and duration data, substitutes the power data and duration data into the formula to obtain the partial discharge analysis coefficient, generates a high partial discharge signal or a low partial discharge signal according to the partial discharge analysis coefficient threshold, and sends it to the discharge monitoring platform; the insulation defect analysis unit performs insulation defect analysis on the ring main unit that has completed partial discharge analysis, obtains the defect length data within the power operation period, generates a defect instantaneous impact signal or a defect continuous impact signal according to the defect length data comparison, and sends it to the discharge monitoring platform;

[0009] After the discharge monitoring platform completes the partial discharge analysis and insulation defect analysis, the partial discharge prediction and analysis unit performs an internal analysis on the insulation parts of the ring main unit, obtains the internal electric field data of the ring main unit, and analyzes the internal electric field data to determine whether there is a partial discharge risk inside the insulation parts.

[0010] As a preferred embodiment of the present invention, the power data includes the average power value excess of the partial discharge power value at the same insulating part in the ring main unit over the set partial discharge power value threshold, and the deviation value growth span of the partial discharge power value at any insulating part corresponding to the same ring main unit in the same switch room and the set partial discharge power value threshold; the duration data is the cumulative duration that the partial discharge power value at any insulating part corresponding to the same ring main unit in the same switch room is continuously in a numerical growth trend and the overlapping duration of the power operation period.

[0011] As a preferred embodiment of the present invention, the partial discharge analysis coefficient threshold comparison process is as follows:

[0012] If the local discharge analysis coefficient GF of the ring main unit exceeds the local discharge analysis coefficient threshold, a high partial discharge signal is generated and sent to the discharge monitoring platform; if the local discharge analysis coefficient GF of the ring main unit does not exceed the local discharge analysis coefficient threshold, a low partial discharge signal is generated and sent to the discharge monitoring platform.

[0013] As a preferred embodiment of the present invention, the defect length data includes the maximum floating span value of the defect length deviation value of the insulation part in the time period before and after the partial discharge value is generated during the power operation period, and the numerical ratio of the increase rate of the partial discharge value to the growth rate of the defect length of the insulation part after the partial discharge value is generated during the power operation period.

[0014] As a preferred embodiment of the present invention, the defect length data comparison process is as follows:

[0015] If the maximum floating span value of the insulation defect length deviation value of the preceding and following periods corresponding to the generation time of the partial discharge value in the power operation period exceeds the maximum floating span value threshold of the deviation value, or the numerical ratio of the partial discharge value increase speed to the insulation defect length growth speed after the partial discharge value in the power operation period is generated does not exceed the growth speed numerical ratio threshold, then a defect instantaneous impact signal is generated;

[0016] If the maximum floating span value of the insulation defect length deviation value in the time periods before and after the partial discharge value is generated during the power operation period does not exceed the maximum floating span value threshold of the deviation value, and the ratio of the partial discharge value increase rate to the insulation defect length growth rate after the partial discharge value is generated during the power operation period exceeds the growth rate ratio threshold, a defect continuous impact signal is generated.

[0017] As a preferred embodiment of the present invention, the internal electric field data of the ring main unit includes the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulating part of the ring main unit during the power operation period and the speed of decrease of the maximum insulated electrical quantity value corresponding to any position inside the insulating part of the ring main unit during the power operation process.

[0018] As a preferred embodiment of the present invention, the internal electric field data analysis process is as follows:

[0019] If the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulation part of the ring main unit during the power operation period exceeds the continuous floating frequency threshold, or the value reduction speed of the corresponding maximum insulated electrical quantity value at any position inside the insulation part of the ring main unit during the power operation process exceeds the value reduction speed threshold, a high risk signal for partial discharge prediction is generated;

[0020] If the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulating part of the ring main unit during the power operation period does not exceed the continuous floating frequency threshold, and the decrease speed of the maximum insulated electrical quantity value corresponding to any position inside the insulating part of the ring main unit during the power operation process does not exceed the value decrease speed threshold, a partial discharge prediction low risk signal is generated and sent to the discharge monitoring platform.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the present invention, partial discharge analysis is performed on the ring main unit to determine whether there is a discharge phenomenon in the current partial discharge of the ring main unit, and discharge monitoring is performed based on the real-time ring main unit operation data collection and analysis, thereby ensuring the real-time monitoring efficiency of the ring main unit and improving the accuracy of the partial discharge monitoring of the ring main unit; insulation defect analysis is performed on the ring main unit that has completed the partial discharge analysis to determine the timeliness of the occurrence of the current insulation defect of the ring main unit, thereby inferring whether the current insulation defect is caused slowly or instantly, so as to accurately infer the cause of the partial discharge, and can maintain the insulation part in a targeted manner to ensure the efficiency of partial discharge control.

[0023] 2. In the present invention, an internal analysis is performed on the insulating parts of the ring network cabinet, and partial discharge of the insulating parts of the ring network cabinet is predicted based on the internal analysis of the insulating parts, thereby improving the partial discharge prediction efficiency of the ring network cabinet, reducing the impact of partial discharge on the operation of the ring network cabinet, and effectively avoiding unnecessary equipment wear; the surrounding environment impact analysis is performed on the ring network cabinet to determine whether the partial discharge during the power operation of the ring network cabinet is affected by the environment, so as to control the environment during the power operation to avoid partial discharge caused by the surrounding environment and affect the operation efficiency of the ring network cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a principle block diagram of Embodiment 1 of the present invention;

[0026] Figure 2 This is a principle block diagram of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] Example 1

[0030] See also Figure 1 As shown, a partial discharge monitoring system for a ring main unit based on data analysis includes a discharge monitoring platform, and the discharge monitoring platform is communicatively connected with a partial discharge analysis unit, an insulation defect analysis unit and a partial discharge prediction analysis unit;

[0031] The discharge monitoring platform generates a partial discharge analysis signal and sends the partial discharge analysis signal to the partial discharge analysis unit. After receiving the partial discharge analysis signal, the partial discharge analysis unit performs partial discharge analysis on the ring main unit to determine whether there is a discharge phenomenon in the current ring main unit partial discharge. The discharge monitoring is performed based on the real-time ring main unit operation data collection and analysis, thereby ensuring the real-time monitoring efficiency of the ring main unit and improving the accuracy of the partial discharge monitoring of the ring main unit.

[0032] The partial discharge power value of the same model of ring main unit in the same switch room corresponding to the same insulation part is obtained, and the average power value excess of the partial discharge power value of the same insulation part exceeding the set partial discharge power value threshold is set as JCZ; the cumulative time that the partial discharge power value of any insulation part of the same ring main unit in the same switch room in the power operation period is in a continuous numerical growth trend and the overlapping time of the power operation period is obtained, and the cumulative time that the partial discharge power value of any insulation part of the same ring main unit in the same switch room in the power operation period is in a continuous numerical growth trend and the overlapping time of the power operation period is marked as CGF;

[0033] Obtain the deviation growth span between the partial discharge power value of any insulating part corresponding to the same ring main unit in the same switch room during the power operation period and the set partial discharge power value threshold, and mark the deviation growth span between the partial discharge power value of any insulating part corresponding to the same ring main unit in the same switch room during the power operation period and the set partial discharge power value threshold as ZKK;

[0034] Substituting the above data into the formula The partial discharge analysis coefficient GF of the ring main unit is obtained, where fh1, fh2 and fh3 are preset proportional coefficients of the average power value excess, overlap duration and deviation value growth span respectively; and the corresponding average power value excess and deviation value growth span are uniformly marked as power data; the overlap duration is set as duration data;

[0035] Compare the partial discharge analysis coefficient GF of the ring main unit with the partial discharge analysis coefficient threshold:

[0036] If the partial discharge analysis coefficient GF of the ring main unit exceeds the partial discharge analysis coefficient threshold, the partial discharge analysis of the ring main unit is determined to be abnormal, a high partial discharge signal is generated and sent to the discharge monitoring platform. After receiving the high partial discharge signal, the discharge monitoring platform maintains the corresponding insulation part of the ring main unit and continuously monitors the operation of the ring main unit;

[0037] If the partial discharge analysis coefficient GF of the ring main unit does not exceed the partial discharge analysis coefficient threshold, the partial discharge analysis of the ring main unit is determined to be normal, a low partial discharge signal is generated and sent to the discharge monitoring platform, and an insulation defect analysis signal is generated and sent to the insulation defect analysis unit.

[0038] After receiving the insulation defect analysis signal, the insulation defect analysis unit performs insulation defect analysis on the ring main unit that has completed the partial discharge analysis, determines the timeliness of the insulation defect of the current ring main unit, and thus infers whether the current insulation defect is caused slowly or instantly, so as to accurately infer the cause of partial discharge, maintain the insulation part in a targeted manner, and ensure the efficiency of partial discharge control;

[0039] Obtain the maximum floating span value of the insulation defect length deviation value of the time period before and after the partial discharge value is generated in the power operation period, and the numerical ratio of the partial discharge value increase speed to the insulation defect length growth speed after the partial discharge value is generated in the power operation period, and compare the maximum floating span value of the insulation defect length deviation value of the time period before and after the partial discharge value is generated in the power operation period, and the numerical ratio of the partial discharge value increase speed to the insulation defect length growth speed after the partial discharge value is generated in the power operation period with the maximum floating span value threshold of the deviation value and the growth speed numerical ratio threshold, respectively; and uniformly mark the collected data as defect length data;

[0040] If the maximum floating span value of the deviation value of the defect length of the insulation part in the time period before and after the partial discharge value is generated in the power operation period exceeds the maximum floating span value threshold of the deviation value, or the numerical ratio of the increase speed of the partial discharge value to the growth speed of the defect length of the insulation part after the partial discharge value is generated in the power operation period does not exceed the growth speed numerical ratio threshold, then it is determined that the defect of the insulation part of the ring network cabinet in the power operation period is caused instantaneously, and a defect instantaneous impact signal is generated and sent to the discharge monitoring platform. After the discharge monitoring platform receives the defect instantaneous impact signal, the insulation material of the corresponding insulation part of the current ring network cabinet is replaced and the current operation intensity of the ring network cabinet is adjusted;

[0041] If the maximum floating span value of the insulation defect length deviation value of the preceding and following time periods corresponding to the partial discharge value generation time within the power operation period does not exceed the maximum floating span value threshold of the deviation value, and the numerical ratio of the partial discharge value increase speed to the insulation defect length growth speed after the partial discharge value generation time within the power operation period exceeds the growth speed numerical ratio threshold, then it is determined that the insulation defect of the ring network cabinet within the power operation period is caused continuously, and a defect continuous impact signal is generated and sent to the discharge monitoring platform. After receiving the defect continuous impact signal, the discharge monitoring platform continuously monitors the insulation part of the ring network cabinet. If defects appear during the monitoring process and the partial discharge value continues to float, the insulation part is replaced.

[0042] After the discharge monitoring platform completes the partial discharge analysis and insulation defect analysis, it generates a partial discharge prediction analysis signal and sends the partial discharge prediction analysis signal to the partial discharge prediction analysis unit. After receiving the partial discharge prediction analysis signal, the partial discharge prediction analysis unit performs an internal analysis on the insulation part of the ring main unit, and predicts partial discharge on the insulation part of the ring main unit based on the internal analysis of the insulation part, thereby improving the partial discharge prediction efficiency of the ring main unit, reducing the impact of partial discharge on the operation of the ring main unit, and effectively avoiding unnecessary equipment wear;

[0043] Obtain the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulation part of the ring main unit during the power operation period and the numerical reduction speed of the maximum insulated electric quantity value corresponding to any position inside the insulation part of the ring main unit during the power operation process, and compare the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulation part of the ring main unit during the power operation period and the numerical reduction speed of the maximum insulated electric quantity value corresponding to any position inside the insulation part of the ring main unit during the power operation period with the continuous floating frequency threshold and the numerical reduction speed threshold respectively: and uniformly mark the collected data as internal electric field data;

[0044] It can be understood that the maximum insulated electrical quantity value is the maximum tolerable electrical quantity of the insulating part in the insulating state;

[0045] If the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulation part of the ring main unit during the power operation period exceeds the continuous floating frequency threshold, or the value reduction speed of the maximum insulated electric quantity value corresponding to any position inside the insulation part of the ring main unit during the power operation process exceeds the value reduction speed threshold, the partial discharge prediction analysis of the ring main unit is judged to be abnormal, and a partial discharge prediction high risk signal is generated and sent to the discharge monitoring platform. After receiving the partial discharge prediction high risk signal, the discharge monitoring platform performs timely maintenance intervention on the insulation part of the ring main unit;

[0046] If the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulation part of the ring main unit during the power operation period does not exceed the continuous floating frequency threshold, and the value reduction speed of the maximum insulated electric quantity value corresponding to any position inside the insulation part of the ring main unit during the power operation process does not exceed the value reduction speed threshold, then the partial discharge prediction analysis of the ring main unit is determined to be normal, and a partial discharge prediction low risk signal is generated and sent to the discharge monitoring platform. After receiving the partial discharge prediction low risk signal, the discharge monitoring platform continuously monitors the insulation part of the ring main unit;

[0047] Example 2

[0048] See also Figure 2 As shown, on the basis of Example 1, an environmental impact analysis is performed on the power operation, and targeted management and control are carried out according to the results of the environmental impact analysis to further reduce the risk of partial discharge;

[0049] The discharge monitoring platform generates a partial discharge monitoring and analysis signal and sends it to the partial discharge monitoring and analysis unit. After receiving the partial discharge monitoring and analysis signal, the partial discharge monitoring and analysis unit analyzes the surrounding environment impact on the ring main unit to determine whether the partial discharge is affected by the environment during the power operation of the ring main unit, thereby controlling the environment during the power operation to avoid partial discharge caused by the surrounding environment and affecting the operation efficiency of the ring main unit;

[0050] The maximum value difference of relative humidity in the surrounding environment corresponding to the period when partial discharge occurred and the period when no partial discharge occurred in the ring main unit during the historical power operation process and the probability of partial discharge occurring when the relative humidity of the surrounding environment of the ring main unit exceeds the set threshold during the historical power operation process are obtained, and the maximum value difference of relative humidity in the surrounding environment corresponding to the period when partial discharge occurred and the period when no partial discharge occurred in the ring main unit during the historical power operation process and the probability of partial discharge occurring when the relative humidity of the surrounding environment of the ring main unit exceeds the set threshold during the historical power operation process are compared with the maximum value difference threshold of humidity and the threshold of partial discharge occurrence probability:

[0051] If the maximum numerical difference of the relative humidity in the surrounding environment corresponding to the period when partial discharge occurred in the ring main unit and the period when no partial discharge occurred during the historical power operation exceeds the maximum numerical difference threshold of humidity, or the probability of partial discharge occurring when the relative humidity of the surrounding environment of the ring main unit exceeds the set threshold during the historical power operation exceeds the probability threshold of partial discharge occurrence, then it is determined that the partial discharge of the ring main unit is affected by the surrounding environment, and an environmental impact signal is generated and sent to the discharge monitoring platform. After receiving the environmental impact signal, the discharge monitoring platform controls the parameters of the surrounding environment of the ring main unit. It can be understood that the environmental parameters of the technical scheme use relative humidity as the collection object. During actual operation, all environmental parameters except relative humidity are applicable to the processing process. At the same time, in the prior art, relative humidity refers to the percentage of water vapor pressure in the air to saturated water vapor pressure; the ratio of the absolute humidity of humid air to the maximum absolute humidity that can be reached at the same temperature; it can also be expressed as the ratio of the water vapor partial pressure in humid air to the saturated pressure of water at the same temperature;

[0052] If the maximum value difference of the relative humidity in the surrounding environment corresponding to the period when the ring main unit has partial discharge and the period when the ring main unit has no partial discharge during the historical power operation process does not exceed the maximum value difference threshold of the humidity, and the probability of partial discharge when the relative humidity of the surrounding environment of the ring main unit exceeds the set threshold during the historical power operation process does not exceed the probability threshold of partial discharge, it is determined that the partial discharge of the ring main unit is not affected by the surrounding environment, and an environment-independent signal is generated and sent to the discharge monitoring platform;

[0053] The above formulas are obtained by collecting a large amount of data and performing software simulation, and a formula close to the actual value is selected. The coefficients in the formula are set by technicians in this field according to actual conditions;

[0054] When the present invention is in use, the local discharge analysis unit performs local discharge analysis on the ring main unit, obtains power data and duration data, substitutes the power data and duration data into the formula to obtain the local discharge analysis coefficient, generates a high partial discharge signal or a low partial discharge signal according to the local discharge analysis coefficient threshold comparison, and sends it to the discharge monitoring platform; the insulation defect analysis unit performs insulation defect analysis on the ring main unit that has completed the local discharge analysis, obtains the defect length data within the power operation period, generates a defect instantaneous impact signal or a defect continuous impact signal according to the defect length data comparison, and sends it to the discharge monitoring platform; after the discharge monitoring platform completes the local discharge analysis and the insulation defect analysis, the partial discharge prediction and analysis unit performs internal analysis on the insulation part of the ring main unit, obtains the internal electric field data of the ring main unit, and judges whether there is a partial discharge risk inside the insulation part based on the internal electric field data analysis.

[0055] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A ring main unit partial discharge monitoring system based on data analysis, characterized in that: It includes a discharge monitoring platform, which is communicatively connected with a partial discharge analysis unit, an insulation defect analysis unit and a partial discharge prediction analysis unit; The partial discharge analysis unit performs partial discharge analysis on the ring main unit, obtains power data and duration data, substitutes the power data and duration data into the formula to obtain the partial discharge analysis coefficient, generates a high partial discharge signal or a low partial discharge signal according to the partial discharge analysis coefficient threshold comparison, and sends it to the discharge monitoring platform; the power data includes the average power value excess of the partial discharge power value of the same insulation part in the ring main unit exceeding the set partial discharge power value threshold, and the deviation value growth span of the partial discharge power value of any insulation part of the same ring main unit in the same switch room and the set partial discharge power value threshold; The duration data is the cumulative duration of the continuous numerical growth trend of the partial discharge power value of any insulation part of the same ring main unit in the same switch room and the overlapping duration of the power operation period; The partial discharge analysis coefficient threshold comparison process is as follows: If the partial discharge analysis coefficient of the ring main unit exceeds the partial discharge analysis coefficient threshold, a high partial discharge signal is generated and sent to the discharge monitoring platform; if the partial discharge analysis coefficient of the ring main unit does not exceed the partial discharge analysis coefficient threshold, a low partial discharge signal is generated and sent to the discharge monitoring platform; The insulation defect analysis unit performs insulation defect analysis on the ring main unit that has completed partial discharge analysis, obtains defect length data during the power operation period, generates defect instantaneous impact signal or defect continuous impact signal based on defect length data comparison, and sends it to the discharge monitoring platform; The defect length data include the maximum floating span value of the insulation defect length deviation value in the time period before and after the partial discharge value is generated during the power operation period, and the numerical ratio of the partial discharge value increase rate to the insulation defect length growth rate after the partial discharge value is generated during the power operation period; The defect length data comparison process is as follows: If the maximum floating span value of the insulation defect length deviation value of the preceding and following periods corresponding to the generation time of the partial discharge value in the power operation period exceeds the maximum floating span value threshold of the deviation value, or the numerical ratio of the partial discharge value increase speed to the insulation defect length growth speed after the partial discharge value in the power operation period is generated does not exceed the growth speed numerical ratio threshold, then a defect instantaneous impact signal is generated; If the maximum floating span value of the insulation defect length deviation value in the preceding and following periods corresponding to the generation time of the partial discharge value in the power operation period does not exceed the maximum floating span value threshold of the deviation value, and the numerical ratio of the partial discharge value increase speed to the insulation defect length growth speed after the partial discharge value in the power operation period is generated exceeds the growth speed numerical ratio threshold, then a defect continuous impact signal is generated; After the discharge monitoring platform completes the partial discharge analysis and insulation defect analysis, the partial discharge prediction and analysis unit performs internal analysis on the insulation part of the ring main unit, obtains the internal electric field data of the ring main unit, and determines whether there is a partial discharge risk inside the insulation part based on the internal electric field data analysis; The internal electric field data of the ring main unit includes the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulating part of the ring main unit during the power operation period and the reduction speed of the maximum insulated electrical quantity value corresponding to any position inside the insulating part of the ring main unit during the power operation process.

2. A ring main unit partial discharge monitoring system based on data analysis according to claim 1, characterized in that: The internal electric field data analysis process is as follows: If the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulation part of the ring main unit during the power operation period exceeds the continuous floating frequency threshold, or the value reduction speed of the corresponding maximum insulated electrical quantity value at any position inside the insulation part of the ring main unit during the power operation process exceeds the value reduction speed threshold, a high risk signal for partial discharge prediction is generated; If the continuous floating frequency of the maximum floating value of the electric field distribution density inside the insulating part of the ring main unit during the power operation period does not exceed the continuous floating frequency threshold, and the decrease speed of the maximum insulated electrical quantity value corresponding to any position inside the insulating part of the ring main unit during the power operation process does not exceed the value decrease speed threshold, a partial discharge prediction low risk signal is generated and sent to the discharge monitoring platform.

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