Unified operation and maintenance management method and system based on multifunctional handheld operation and maintenance terminal

Abstract

The invention discloses a unified operation and maintenance management method and system based on a multifunctional handheld operation and maintenance terminal, relates to the technical field of unified operation and maintenance management, and ensures the communication security between equipment through Bluetooth encryption connection between the handheld terminal and a feeder terminal, effectively prevents unauthorized access and data leakage, and improves the safety of the equipment. According to the method, through a unified operation and maintenance mode, operation and maintenance personnel can manage feeder terminals of different manufacturers only by mastering the operation of the handheld terminal, so that the operation complexity and the technical requirements are reduced, and the flexibility and the convenience of equipment maintenance are remarkably improved; meanwhile, through the modes of data acquisition, platform analysis and automatic work order generation, the system can evaluate the operation health condition of the equipment in time and recognize potential faults in advance, the risk of manual judgment errors is reduced through the automatic and intelligent operation and maintenance process, the high efficiency and accuracy of fault processing are ensured, and the system is suitable for popularization and application. And the overall operation and maintenance management level and the operation safety are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of unified operation and maintenance management, and in particular to a unified operation and maintenance management method and system based on a multifunctional handheld operation and maintenance terminal. Background Art

[0002] In the existing power distribution system operation and maintenance process, operation and maintenance personnel usually need to complete equipment inspection, debugging and troubleshooting through manual operation, especially in harsh environments, such as high altitude or extreme weather. Operation and maintenance personnel need to climb poles to operate equipment, which not only poses great safety risks, but also increases work difficulty and time costs. In addition, with the diversification of equipment types and manufacturers in the power distribution system, feeder terminals of different manufacturers are incompatible with each other and lack a unified management platform. Operation and maintenance personnel must operate these devices through different tools or platforms, which not only increases the complexity of maintenance, but also easily leads to information islands.

[0003] In this decentralized system, the operating status, equipment defects, and fault information of each terminal cannot be transmitted and fed back in a timely manner, and equipment hidden dangers are difficult to detect and deal with in a timely manner. Serious equipment failures often occur due to failure to maintain or identify fault signs in a timely manner, affecting the stability and reliability of the power supply system. In addition, manual maintenance methods are inefficient, and fault location and repair time are long, which cannot meet the requirements of modern power systems for rapid response and efficient operation and maintenance. In the face of these problems, an intelligent operation and maintenance solution that can achieve remote operation and unified management is urgently needed to improve operation and maintenance efficiency and equipment safety. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a unified operation and maintenance management method and system based on a multifunctional handheld operation and maintenance terminal, which solves the problems in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a unified operation and maintenance management method based on a multifunctional handheld operation and maintenance terminal, comprising:

[0006] Step 1: The operation and maintenance personnel use a handheld terminal to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication to obtain monitoring information of the feeder terminal in the jurisdiction area;

[0007] Step 2: Then the monitoring information obtained by the handheld terminal is displayed on the handheld terminal;

[0008] Step 3: The handheld terminal obtains the operating data of the feeder terminal and synchronizes the operating data of the feeder terminal to the dispatching platform. The dispatching platform analyzes the operating data, evaluates the operating status, and evaluates the operating health index of the feeder terminal.

[0009] Step 4: According to the evaluated operational health index number of the feeder terminal, a work order is automatically generated. The work order is a work order for the process of evaluating the operational health index number of the feeder terminal, and is sent to the handheld terminal for display.

[0010] As a further solution of the present invention: in the step 1, the monitoring information is represented by the feeder terminal monitoring the operation status of the power distribution system and various parameters and information required for monitoring and control, including switch status, power parameters, phase-to-phase faults, ground faults and parameters at the time of the fault;

[0011] The feeder terminals in the jurisdiction are from different manufacturers.

[0012] As a further solution of the present invention: the operation and maintenance personnel use the handheld terminal to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication:

[0013] S1: Install a smart Bluetooth chip in the handheld terminal;

[0014] S2: The handheld terminal scans through the Bluetooth module, tries to find the encryption chip of the feeder terminal in the jurisdiction area, and establishes a connection;

[0015] S3: After the Bluetooth connection is established, the handheld terminal sends the serial number of the smart Bluetooth chip installed in it to the distribution feeder terminal and initiates an authentication request at the same time;

[0016] S4: The feeder terminal receives the serial number of the smart Bluetooth chip and verifies the legitimacy and correctness of the serial number;

[0017] S5: If the serial number of the smart Bluetooth chip passes the authentication, the authentication between the handheld terminal and the feeder terminal is successful, and data interaction and communication are performed.

[0018] As a further solution of the present invention: in step 3, the handheld terminal acquires the operation data of the feeder terminal and synchronizes the operation data of the feeder terminal to the dispatching platform. Specifically, the following contents are included:

[0019] Collecting operation record data of the feeder terminal through the collection module in the feeder terminal device, wherein the operation record data includes three-phase current data, three-phase voltage data, zero-sequence current, internal temperature and number of historical faults;

[0020] The operation record data is processed by a data processing module to determine the operation data of the feeder terminal device, wherein the operation data includes a three-phase current unbalance rate, a three-phase voltage unbalance rate, a zero-sequence current, an internal temperature, and a number of historical faults;

[0021] Then the historical records and real-time records of the operation data are stored in the storage container of the feeder terminal. When the handheld terminal is connected to the feeder terminal, the handheld terminal obtains the operation data in the storage container of the feeder terminal and synchronizes it to the dispatching platform.

[0022] As a further solution of the present invention: the data processing module processes the operation record data to determine the operation data of the feeder terminal device in a specific manner as follows:

[0023] Obtain the three-phase current data and three-phase voltage data and obtain the three-phase current unbalance rate I through the following formula unbalanced And three-phase voltage unbalance rate PVUR:

[0024]

[0025] In the formula, I max is the maximum value among the three-phase currents, I min is the minimum value among the three-phase currents, I max is the maximum value among the three-phase currents, I min is the minimum value among the three-phase currents, I average is the average value of the three-phase current data, U A , U B , U C Represents three-phase voltage data respectively; U avg is the average value of three-phase voltage data;

[0026] No processing is done on the collected zero-sequence current, internal temperature and historical fault times.

[0027] As a further solution of the present invention: the specific method of analyzing the operation data through the scheduling platform and evaluating the operation status is:

[0028] P1: For any operating data X, calculate its change rate ΔX using the following formula:

[0029]

[0030] Where X represents any one of the three-phase current unbalance rate, three-phase voltage unbalance rate, zero-sequence current, internal temperature and historical fault times. current is the value at the current moment, X previous is the value at the previous moment;

[0031] P2: Then determine the moving average of n moments in a period of time T using the following formula

[0032]

[0033] Where, Xi represents the value of any operating data at the i-th moment, and n represents the total moments in a period of time T;

[0034] Then the dynamic deviation Ux is calculated by the following formula:

[0035]

[0036] Combine the dynamic deviation Ux and the change rate ΔX for joint evaluation, and determine the risk index R through the following formula X :

[0037] R X =|ΔX|+|Ux|

[0038] P3: Then, for each operation data, the corresponding risk index R is calculated through steps P1-P2. X , and then the operational health index S of the feeder terminal equipment is obtained by the following formula:

[0039]

[0040] Where k is the adjustment coefficient.

[0041] A unified operation and maintenance management system based on a multi-functional handheld operation and maintenance terminal, including:

[0042] The feeder terminal is used to provide monitoring information and store the operation data of the feeder terminal. The feeder terminal includes a collection module, a data processing module and a storage container;

[0043] The handheld terminal is used to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication, obtain the monitoring information of the feeder terminal in the jurisdiction area, and simultaneously obtain the operation data of the feeder terminal and synchronize the operation data of the feeder terminal to the dispatching platform;

[0044] The dispatching platform is used to analyze the synchronized operation data, conduct operation status evaluation, and evaluate the operation health indicators of the feeder terminal.

[0045] The acquisition module is used to collect the operation record data of the feeder terminal;

[0046] The data processing module is used to process the operation record data to determine the operation data of the feeder terminal equipment;

[0047] The storage container is used to store historical records and real-time records of operating data.

[0048] The present invention provides a unified operation and maintenance management method and system based on a multifunctional handheld operation and maintenance terminal. Compared with the prior art, it has the following beneficial effects:

[0049] The present invention ensures the communication security between devices through the Bluetooth encrypted connection between the handheld terminal and the feeder terminal, effectively preventing unauthorized access and data leakage. The method realizes a unified operation and maintenance mode, and the operation and maintenance personnel only need to master the operation of the handheld terminal to manage the feeder terminals of different manufacturers, thereby reducing the operation complexity and technical requirements and significantly improving the flexibility and convenience of equipment maintenance. At the same time, through data collection, platform analysis and automatic generation of work orders, the system can timely evaluate the operating health of the equipment and identify potential faults in advance. This automated and intelligent operation and maintenance process reduces the risk of human misjudgment, ensures the efficiency and accuracy of fault handling, ensures the stable operation of the distribution system, and improves the overall operation and maintenance management level and operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] Figure 1 It is a flowchart of the steps of the unified operation and maintenance management method based on the multifunctional handheld operation and maintenance terminal of the present invention;

[0052] Figure 2 This is a structural framework diagram of a unified operation and maintenance management system based on a multifunctional handheld operation and maintenance terminal of the present invention;

[0053] Figure 3 It is a schematic diagram of a Bluetooth wireless communication mode of a unified operation and maintenance management method based on a multifunctional handheld operation and maintenance terminal of the present invention; DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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.

[0055] Embodiment 1

[0056] See also Figure 1 , the present invention provides a unified operation and maintenance management method based on a multifunctional handheld operation and maintenance terminal, including;

[0057] Step 1: The operation and maintenance personnel use a handheld terminal to connect to the feeder terminal (FTU) in the jurisdiction area through Bluetooth wireless communication to obtain monitoring information of the feeder terminal in the jurisdiction area;

[0058] Monitoring information refers to the distribution system operation status and various parameters monitored by the feeder terminal and the information required for monitoring and control, including switch status, power parameters, phase-to-phase faults, ground faults, and parameters at the time of faults.

[0059] Specifically, the handheld terminal includes a portable device such as a mobile phone or a tablet; the feeder terminals in the jurisdiction may come from different manufacturers;

[0060] See also Figure 3 The specific method in which the operation and maintenance personnel use the handheld terminal to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication is:

[0061] S1: Install the smart Bluetooth chip (usbkey) in the handheld terminal;

[0062] S2: The handheld terminal scans through the Bluetooth module, tries to find the encryption chip of the feeder terminal in the jurisdiction area, and establishes a connection;

[0063] It should be noted that for the feeder terminals in the jurisdiction, encryption chips should be installed inside the feeder terminals in advance;

[0064] S3: After the Bluetooth connection is established, the handheld terminal sends the serial number of the smart Bluetooth chip installed in it to the distribution feeder terminal and initiates an authentication request at the same time;

[0065] S4: The feeder terminal receives the serial number of the smart Bluetooth chip and verifies the legitimacy and correctness of the serial number;

[0066] S5: If the serial number of the smart Bluetooth chip passes the authentication, the authentication between the handheld terminal and the feeder terminal is successful, and data interaction and communication are performed;

[0067] This method ensures the communication security between the handheld terminal and the power distribution equipment. Only after the correct encryption chip is inserted and verified, the equipment can exchange data, preventing unauthorized access or data leakage.

[0068] Step 2: The monitoring information obtained by the handheld terminal is then displayed on the handheld terminal for operation and maintenance personnel to adjust and control the power distribution system accordingly;

[0069] It should be noted that the feeder terminal has remote control, telemetry, telesignaling, and fault detection functions, and communicates with the distribution automation master station to provide the distribution system operation status and various parameters and information required for monitoring and control, including switch status, power parameters, phase-to-phase faults, ground faults, and parameters at the time of faults, and executes commands issued by the distribution automation master station to adjust and control the distribution equipment, and realize functions such as fault location, fault isolation, and rapid restoration of power supply to non-fault areas. Through the communication between the handheld terminal and the feeder terminal, the operation and maintenance personnel can determine the distribution system operation status and various parameters and information required for monitoring and control on site. At the same time, after the handheld terminal is successfully connected to the feeder terminal via Bluetooth, the three remote functions, namely remote control, telesignaling, and telemetry, can be realized, which is convenient for the staff to adjust and control the distribution equipment on site and to perform fault inspection and repair work;

[0070] Step 3: The handheld terminal obtains the operating data of the feeder terminal and synchronizes the operating data of the feeder terminal to the dispatching platform. The dispatching platform analyzes the operating data, evaluates the operating status, and evaluates the operating health index of the feeder terminal.

[0071] The specific contents of the handheld terminal acquiring the operation data of the feeder terminal and synchronizing the operation data of the feeder terminal to the dispatching platform include:

[0072] Collecting operation record data of the feeder terminal through the collection module in the feeder terminal device, wherein the operation record data includes three-phase current data, three-phase voltage data, zero-sequence current, internal temperature and number of historical faults;

[0073] The operation record data is processed by a data processing module to determine the operation data of the feeder terminal device, wherein the operation data includes a three-phase current unbalance rate, a three-phase voltage unbalance rate, a zero-sequence current, an internal temperature, and a number of historical faults;

[0074] The data processing module processes the operation record data to determine the operation data of the feeder terminal device in the following specific manner:

[0075] Obtain the three-phase current data and three-phase voltage data and obtain the three-phase current unbalance rate I through the following formula unbalanced And three-phase voltage unbalance rate PVUR:

[0076]

[0077] In the formula, I average is the average value of the three-phase current data, U A , U B , U C Represents three-phase voltage data respectively; U avg is the average value of three-phase voltage data;

[0078] And no processing is done on the collected zero-sequence current, internal temperature and historical fault times;

[0079] Specifically, the historical records and real-time records of the operation data are stored in the storage container of the feeder terminal. When the handheld terminal is connected to the feeder terminal, the handheld terminal obtains the operation data in the storage container of the feeder terminal and synchronizes it to the dispatching platform;

[0080] The specific method of analyzing the operation data through the scheduling platform and evaluating the operation status is as follows:

[0081] P1: For any operating data X, calculate its change rate ΔX using the following formula:

[0082]

[0083] Where X represents any one of the three-phase current unbalance rate, three-phase voltage unbalance rate, zero-sequence current, internal temperature and historical fault times. current is the value at the current moment, X previous is the value at the previous moment;

[0084] Specifically, the change rate ΔX reflects the change speed of the operating data. If the change rate ΔX is too high, it means that the parameter has fluctuated greatly, which means that the equipment operation status is abnormal.

[0085] P2: Then determine the moving average of n moments in a period of time T using the following formula

[0086]

[0087] Where, X i It represents the value of any running data at the i-th moment, n represents the total time in a period of time T, and the specific duration of a period of time T is set by professional staff;

[0088] Then the dynamic deviation Ux is calculated by the following formula:

[0089]

[0090] This dynamic deviation Ux is used to measure whether the current data has a significant deviation from the trend of the past period of time. If the deviation is large, it means that the current equipment status is significantly different from the past operating trend, which may indicate abnormal equipment operation;

[0091] Combine the dynamic deviation Ux and the change rate ΔX for joint evaluation, and determine the risk index R through the following formula X :

[0092] RX =|ΔX|+|Ux|

[0093] Risk Index R X It reflects whether the parameter is in a large fluctuation or abnormal state; if R X If it is very large, it means that the parameter has undergone serious changes and there is a potential risk;

[0094] P3: Then, for each operation data, the corresponding risk index R is calculated through steps P1-P2. X , and then the operational health index S of the feeder terminal equipment is obtained by the following formula:

[0095]

[0096] In the formula, k is the adjustment coefficient, which is used to control the impact of each risk index on the operational health index. The specific parameter value is set by the staff;

[0097] By introducing the rate of change and dynamic deviation, a more dynamic and intelligent device health assessment method can be designed. This method not only considers the current device operation data, but also analyzes its difference from historical trends and the speed of change, which can more effectively discover potential threats to the device. This method is suitable for devices with fast monitoring data changes and can identify abnormal behavior of the device in advance.

[0098] Step 4: According to the operation health index of the feeder terminal evaluated, a work order is automatically generated. The work order is a work order for the process of evaluating the operation health index of the feeder terminal, and is sent to the handheld terminal for display. The operation and maintenance personnel view the work order to understand the operation status of the feeder terminal in the jurisdiction area, and perform corresponding maintenance on the feeder terminal according to the operation health index of the feeder terminal evaluated;

[0099] By identifying potential threats to feeder terminal equipment through the "work order for evaluating the operational health indicators of feeder terminals", the dispatching platform can automatically generate maintenance tasks or work orders after the analysis is completed and directly distribute them to operation and maintenance personnel, reducing the intervention of manual judgment;

[0100] The above-mentioned handheld terminal is intended to build a unified operation and maintenance platform compatible with different manufacturers, which can be applied to the testing of different feeder terminals. The operation and maintenance personnel only need to master the use of the handheld terminal to perform on-site operation and maintenance debugging of the feeder terminals of all manufacturers in the jurisdiction, thereby achieving timely and effective terminal operation and maintenance;

[0101] Embodiment 2

[0102] In the specific implementation process of this embodiment, based on the first embodiment, and different from the first embodiment, this embodiment specifically obtains the process of evaluating the operation health index number of the feeder terminal through an actual case method:

[0103] The operation data synchronized from the dispatching platform to a feeder terminal are as follows:

[0104] Current unbalance rate I imb :The current value is 12%, the previous moment was 10%, and the moving average of the past 5 times is 9.5%;

[0105] Voltage unbalance rate V imb : The current value is 6%, the previous value was 5.5%, and the moving average is 5%;

[0106] Zero-sequence current I0: current value 60mA, previous moment 50mA, moving average value 45mA;

[0107] Temperature T: current value 70℃, previous value 65℃, moving average value 63℃;

[0108] Historical failure frequency F: The failure frequency remains unchanged throughout the year (remains stable)

[0109] By formula: Calculate the respective rates of change: ΔI imb 0.2, ΔV imb is 0.091, ΔI0 is 0.2, ΔT is 0.077 and ΔF is 0;

[0110] By formula The dynamic deviations are calculated as follows: is 0.263, is 0.2, is 0.333, U T is 0.111 and U F is 0;

[0111] Then, through the formula R X =|ΔX|+|Ux| The risk indices are calculated as follows: is 0.463, is 0.291, 0.533, R T is 0.188 and R F is 0;

[0112] Finally, through the formula S = 100-k·∑ X R X The operational health index of the feeder terminal is calculated and evaluated. In this embodiment, k in the formula is 10, and the calculated result is 85.25;

[0113] According to calculations, the health index number is 85.25, indicating that the equipment is in good operating condition, but some slight fluctuations have occurred, especially in terms of current imbalance and zero-sequence current, which may require regular attention and maintenance by operation and maintenance personnel;

[0114] Embodiment 3

[0115] See also Figure 3 In the specific implementation process, this embodiment is based on the first and second embodiments, and the difference from the first and second embodiments is that this embodiment further provides a unified operation and maintenance management system based on a multifunctional handheld operation and maintenance terminal, including:

[0116] The feeder terminal is used to provide monitoring information and store the operation data of the feeder terminal. The feeder terminal includes a collection module, a data processing module and a storage container;

[0117] The acquisition module is used to collect the operation record data of the feeder terminal;

[0118] The data processing module is used to process the operation record data to determine the operation data of the feeder terminal equipment;

[0119] The storage container is used to store historical records and real-time records of operating data;

[0120] The handheld terminal is used to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication, obtain the monitoring information of the feeder terminal in the jurisdiction area, and simultaneously obtain the operation data of the feeder terminal and synchronize the operation data of the feeder terminal to the dispatching platform;

[0121] The dispatching platform is used to analyze the synchronized operation data, conduct operation status evaluation, and evaluate the operation health indicators of the feeder terminals;

[0122] Embodiment 4

[0123] The specific implementation process of this embodiment includes all the implementation processes of the above three groups of embodiments.

[0124] Some of the data in the above formulas are dimensionless and numerically calculated. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0125] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A unified operation and maintenance management method based on a multifunctional handheld operation and maintenance terminal, characterized in that: include: Step 1: The operation and maintenance personnel use a handheld terminal to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication to obtain monitoring information of the feeder terminal in the jurisdiction area; Step 2: Then the monitoring information obtained by the handheld terminal is displayed on the handheld terminal; Step 3: The handheld terminal obtains the operating data of the feeder terminal and synchronizes the operating data of the feeder terminal to the dispatching platform. The dispatching platform analyzes the operating data, evaluates the operating status, and evaluates the operating health index of the feeder terminal. Step 4: According to the evaluated operational health index number of the feeder terminal, a work order is automatically generated. The work order is a work order for the process of evaluating the operational health index number of the feeder terminal, and is sent to the handheld terminal for display.

2. The unified operation and maintenance management method based on the multifunctional handheld operation and maintenance terminal according to claim 1 is characterized in that: In the step 1, the monitoring information is represented by the feeder terminal monitoring the operation status of the power distribution system and various parameters and information required for monitoring and control, including switch status, power parameters, phase-to-phase faults, ground faults, and parameters at the time of the fault; The feeder terminals in the jurisdiction are from different manufacturers.

3. The unified operation and maintenance management method based on the multifunctional handheld operation and maintenance terminal according to claim 1 is characterized in that: The specific method in which the operation and maintenance personnel use the handheld terminal to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication is: S1: Install a smart Bluetooth chip in the handheld terminal; S2: The handheld terminal scans through the Bluetooth module, tries to find the encryption chip of the feeder terminal in the jurisdiction area, and establishes a connection; S3: After the Bluetooth connection is established, the handheld terminal sends the serial number of the smart Bluetooth chip installed in it to the distribution feeder terminal and initiates an authentication request at the same time; S4: The feeder terminal receives the serial number of the smart Bluetooth chip and verifies the legitimacy and correctness of the serial number; S5: If the serial number of the smart Bluetooth chip passes the authentication, the authentication between the handheld terminal and the feeder terminal is successful, and data interaction and communication are performed.

4. The unified operation and maintenance management method based on the multifunctional handheld operation and maintenance terminal according to claim 1 is characterized in that: In step 3, the handheld terminal acquires the operation data of the feeder terminal and synchronizes the operation data of the feeder terminal to the dispatching platform. Specifically, the following contents are included: Collecting operation record data of the feeder terminal through the collection module in the feeder terminal device, wherein the operation record data includes three-phase current data, three-phase voltage data, zero-sequence current, internal temperature and number of historical faults; The operation record data is processed by a data processing module to determine the operation data of the feeder terminal device, wherein the operation data includes a three-phase current unbalance rate, a three-phase voltage unbalance rate, a zero-sequence current, an internal temperature, and a number of historical faults; Then the historical records and real-time records of the operation data are stored in the storage container of the feeder terminal. When the handheld terminal is connected to the feeder terminal, the handheld terminal obtains the operation data in the storage container of the feeder terminal and synchronizes it to the dispatching platform.

5. The unified operation and maintenance management method based on the multifunctional handheld operation and maintenance terminal according to claim 4 is characterized in that: The data processing module processes the operation record data to determine the operation data of the feeder terminal device in the following specific manner: Obtain the three-phase current data and three-phase voltage data and obtain the three-phase current unbalance rate I through the following formula unbalanced And three-phase voltage unbalance rate PVUR: In the formula, I max is the maximum value among the three-phase currents, I min is the minimum value among the three-phase currents, I average is the average value of the three-phase current data, U A , U B , U C Represents three-phase voltage data respectively; U avg is the average value of three-phase voltage data; No processing is done on the collected zero-sequence current, internal temperature and historical fault times.

6. The unified operation and maintenance management method based on the multifunctional handheld operation and maintenance terminal according to claim 4 is characterized in that: The specific method of analyzing the operation data through the scheduling platform and evaluating the operation status is as follows: P1: For any operating data X, calculate its change rate ΔX using the following formula: Where X represents any one of the three-phase current unbalance rate, three-phase voltage unbalance rate, zero-sequence current, internal temperature and historical fault times. current is the value at the current moment, X previous is the value at the previous moment; P2: Then determine the moving average of n moments in a period of time T using the following formula Where, X i represents the value of any operating data at the i-th moment, and n represents the total moments in a period of time T; Then the dynamic deviation Ux is calculated by the following formula: Combine the dynamic deviation Ux and the change rate ΔX for joint evaluation, and determine the risk index R through the following formula X : R X =|ΔX|+|Ux| P3: Then, for each operation data, the corresponding risk index R is calculated through steps P1-P2. X , and then the operational health index S of the feeder terminal equipment is obtained by the following formula: Where k is the adjustment coefficient.

7. A unified operation and maintenance management system based on a multifunctional handheld operation and maintenance terminal, characterized in that: include: The feeder terminal is used to provide monitoring information and store the operation data of the feeder terminal. The feeder terminal includes a collection module, a data processing module and a storage container; The handheld terminal is used to connect to the feeder terminal in the jurisdiction area through Bluetooth wireless communication, obtain the monitoring information of the feeder terminal in the jurisdiction area, and simultaneously obtain the operation data of the feeder terminal and synchronize the operation data of the feeder terminal to the dispatching platform; The dispatching platform is used to analyze the synchronized operation data, conduct operation status evaluation, and evaluate the operation health indicators of the feeder terminal.

8. The unified operation and maintenance management system based on the multifunctional handheld operation and maintenance terminal according to claim 7 is characterized in that: The acquisition module is used to collect the operation record data of the feeder terminal; The data processing module is used to process the operation record data to determine the operation data of the feeder terminal equipment; The storage container is used to store historical records and real-time records of operating data.

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