Transformer area low-voltage cause analysis method, equipment and medium

Abstract

The invention discloses a transformer area low-voltage cause analysis method and device and a medium. The method comprises the following steps: acquiring acquisition information of a transformer area in real time; determining a low-voltage event of the transformer area according to the acquired information; the causes of the low-voltage event are analyzed through the collected information to obtain the low-voltage cause, and the low-voltage cause comprises single-phase disconnection, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device fault, low power factor, unreasonable transformer gear and low-voltage abnormity; and performing intelligent decision according to the low-voltage cause to obtain conclusion information. By acquiring the acquisition information of the existing power distribution automation system and determining the low-voltage event and the specific low-voltage cause according to the acquisition information, low-voltage monitoring and cause analysis can be realized without additional equipment, the cause of the low voltage in the transformer area can be analyzed and judged in real time, the analysis cost is low, the applicability is wide, and the method is suitable for popularization and application. The method can be widely applied to the technical field of power distribution networks.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network, and in particular to a method, device and medium for analyzing the cause of low voltage in a substation. Background Art

[0002] With the State Grid vigorously developing new smart substations, popularizing integrated terminals and connecting a large number of software and hardware sensors to low-voltage substations, the power grid has greatly improved its intelligence and digitalization level for low-voltage substations. However, the low voltage problem in the substation has always been the key reason for grid companies to improve service quality. The existing low voltage cause analysis requires the cooperation of smart meters and monitoring systems, and smart meters generally collect data once every half a day, making it difficult for all smart meters to send voltage and current data in real time. Even if they can send data in real time, they can only identify the occurrence of low voltage, and cannot analyze the cause of low voltage through real-time measurement data such as voltage and current. Summary of the invention

[0003] In view of this, the purpose of the embodiments of the present invention is to provide a method, device and medium for analyzing the cause of low voltage in a substation, which can analyze and determine the cause of low voltage in a substation in real time with low analysis cost.

[0004] In a first aspect, an embodiment of the present invention provides a method for analyzing the causes of low voltage in a substation, comprising:

[0005] Acquire the collected information of the substation in real time, wherein the collected information represents the information collected by the distribution automation system of the substation;

[0006] Determine a low voltage event in the substation according to the collected information;

[0007] Analyzing the cause of the low voltage event through the collected information to obtain the cause of the low voltage, wherein the cause of the low voltage includes single-phase disconnection, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear position and low voltage abnormality;

[0008] Make intelligent decisions based on the causes of low voltage and obtain conclusion information.

[0009] In some optional embodiments, determining the low voltage event of the substation according to the collected information includes:

[0010] Obtain the distribution transformer account of the distribution automation system;

[0011] Obtaining the three-phase voltage of the distribution transformer from the business library of the distribution automation system according to the distribution transformer account of the substation area;

[0012] Determine the maximum voltage within a current time range according to the three-phase voltage of the distribution transformer, wherein the current time range represents a time range formed by preset time points before and after the current moment;

[0013] When the maximum voltage is less than 198 V, the low voltage event of the stage is generated.

[0014] In some optional embodiments, the single-phase grounding determination analysis includes:

[0015] Obtaining the maximum value of the three-phase voltage of the distribution transformer from the service library of the distribution automation system to obtain the maximum distribution transformer voltage;

[0016] Obtaining the maximum value of the three-phase current of the distribution transformer from the business database to obtain the maximum distribution transformer current;

[0017] Calculate the three-phase imbalance degree according to the maximum distribution transformer voltage and the maximum distribution transformer current;

[0018] When the three-phase imbalance is greater than 70%, the three-phase current of the transformer area at the first preset time before the current moment is obtained to obtain the normal distribution transformer current;

[0019] Comparing the maximum distribution transformer current with the normal distribution transformer current to obtain a current ratio;

[0020] When the current ratio is greater than ten, the low voltage cause is configured as the single-phase grounding.

[0021] In some optional embodiments, the judgment and analysis of the single-phase disconnection includes:

[0022] Obtaining from the business database a first voltage of each of the three phases at the distribution transformer outlet at the current moment, and a second voltage of each of the three phases at a first preset time before the current moment;

[0023] Calculating a voltage ratio of each phase in three phases according to the first voltage and the second voltage, wherein the voltage ratio represents a ratio of the first voltage to the second voltage;

[0024] When the voltage ratio of phase A is greater than 85% and less than 115%, the voltage ratio of phase B is greater than 35% and less than 65%, and the voltage ratio of phase C is greater than or equal to 35% and less than or equal to 65%, the low voltage cause is configured as the single-phase line break.

[0025] In some optional embodiments, the judgment and analysis of three-phase imbalance includes:

[0026] When the three-phase imbalance is greater than 25%, a first power ratio of the power of the low-voltage phase in the three-phase voltage to the substation power is calculated;

[0027] When the first power ratio is greater than 50%, the low voltage cause is configured as the three-phase imbalance.

[0028] In some optional embodiments, the judgment and analysis of the failure of the distribution transformer outlet metering device includes:

[0029] Obtaining the household meter ledger of the distribution transformer from the business library of the distribution automation system;

[0030] When the distribution transformer account in the substation area is empty, the household meter account is grouped according to the distribution transformer phase to obtain a grouped household meter account;

[0031] Obtaining household meter telemetry data of the grouped household meter ledger;

[0032] According to the household meter telemetry data, the phase voltage of the transformer is compared with the phase voltage of the household meter to obtain a phase voltage ratio;

[0033] When the phase voltage ratio indicates that the distribution transformer phase voltage is less than the household meter phase voltage, the number of household meters whose household meter phase voltage is greater than the distribution transformer phase voltage is obtained;

[0034] When the number of household meters is greater than 5, the cause of the low voltage is configured as a failure of the distribution transformer outlet metering device.

[0035] In some optional embodiments, the judgment analysis of low power factor includes:

[0036] Acquire the maximum active power of the distribution transformer before the low voltage event occurs and the maximum power factor corresponding to the maximum active power from the service library of the distribution automation system;

[0037] When the maximum power factor is less than 0.85, obtaining the maximum user active power and the area power, and calculating a second power ratio of the maximum user active power to the area power, wherein the maximum user active power represents the maximum power used by a single user;

[0038] When the second power ratio is greater than 40%, the low voltage cause is configured as the power factor is low.

[0039] In some optional embodiments, the judgment and analysis of the low voltage anomaly includes:

[0040] Obtaining the total active power of the distribution transformer from the service library of the distribution automation system;

[0041] Obtain the allocated three-phase current, three-phase voltage and the maximum voltage among the three-phase voltages from the business database;

[0042] Calculating an estimated value according to the total active power and the maximum voltage;

[0043] When the A-phase current, the B-phase current and the C-phase current are all smaller than the estimated value, or the A-phase voltage, the B-phase voltage and the C-phase voltage are all smaller than 150 V, the low voltage cause is configured as the low voltage abnormality.

[0044] In a second aspect, an embodiment of the present invention provides a computer device, comprising a processor, a memory, and a computer program stored in the memory and executable by the processor, wherein the steps of the above method are implemented when the computer program is executed by the processor.

[0045] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, in which a program executable by a processor is stored. When the program executable by the processor is executed by the processor, it is used to perform the method as described above.

[0046] Implementation of the embodiments of the present invention includes the following beneficial effects: The embodiments of the present invention provide a method for analyzing the causes of low voltage in a substation, including: acquiring the collected information of the substation in real time, the collected information representing the information collected by the distribution automation system of the substation; determining the low voltage event in the substation according to the collected information; analyzing the cause of the low voltage event through the collected information to obtain the cause of the low voltage, the cause of the low voltage includes single-phase line break, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear and low voltage abnormality; making intelligent decisions according to the cause of the low voltage to obtain conclusion information. By acquiring the collected information of the existing distribution automation system and determining the low voltage event and the specific cause of the low voltage according to the collected information, low voltage monitoring and cause analysis can be achieved without adding additional equipment, which can not only analyze and determine the cause of the low voltage in the substation in real time, but also has low analysis cost and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a flowchart of the steps of a method for analyzing the causes of low voltage in a transformer area provided by an embodiment of the present invention;

[0048] Figure 2 is a flow chart of single-phase grounding analysis provided by an embodiment of the present invention;

[0049] Figure 3 is a flow chart of analysis of single-phase disconnection provided by an embodiment of the present invention;

[0050] Figure 4 is a flow chart of three-phase imbalance analysis provided by an embodiment of the present invention;

[0051] Figure 5It is a flow chart for analyzing the failure of the distribution transformer outlet metering device provided by an embodiment of the present invention;

[0052] Figure 6 is a flow chart of analyzing low power factor provided by an embodiment of the present invention;

[0053] Figure 7 is a flowchart of analyzing low voltage anomaly provided by an embodiment of the present invention;

[0054] Figure 8 An analysis flow chart of unreasonable transformer gear position provided by an embodiment of the present invention;

[0055] Fig. 9 It is a schematic block diagram of the structure of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0057] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0059] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0060] The embodiment of the present invention provides a method, device and medium for analyzing the causes of low voltage in a substation, wherein a method for analyzing the causes of low voltage in a substation includes: acquiring the collected information of the substation in real time, wherein the collected information represents the information collected by the distribution automation system of the substation; determining the low voltage event in the substation according to the collected information; analyzing the cause of the low voltage event through the collected information to obtain the cause of the low voltage, wherein the cause of the low voltage includes single-phase disconnection, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear and low voltage abnormality; making intelligent decisions according to the cause of the low voltage to obtain conclusion information. By acquiring the collected information of the existing distribution automation system and determining the low voltage event and the specific cause of the low voltage according to the collected information, the monitoring and cause analysis of the low voltage can be realized without adding additional equipment, which can not only analyze and determine the cause of the low voltage in the substation in real time, but also has low analysis cost and wide applicability.

[0061] The method of the embodiment of the present invention is further described below.

[0062] Reference Figure 1 , Figure 1 A flowchart of a method for analyzing the causes of low voltage in a substation provided by an embodiment of the present invention, the method for analyzing the causes of low voltage in a substation includes but is not limited to the following steps:

[0063] S101, acquiring collected information of the substation in real time, where the collected information represents information collected by the distribution automation system of the substation;

[0064] S102, determining a low voltage event in the substation according to the collected information;

[0065] S103, analyzing the cause of the low voltage event through the collected information to obtain the cause of the low voltage, wherein the cause of the low voltage includes single-phase disconnection, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear position and low voltage abnormality;

[0066] S104, making intelligent decisions based on the causes of the low voltage to obtain conclusion information.

[0067] It should be noted that the present application uses a medium- and low-voltage integration method in the existing distribution automation system of the power grid to analyze and determine in real time the cause of the low voltage at the outlet of the distribution transformer in the substation. Since the distribution automation system is a key and essential system for the operation of the power grid, by implementing a medium- and low-voltage integrated graphical model system data with both medium-voltage data and low-voltage data in the system, the cause of the low voltage at the outlet of the substation can be analyzed from the entire topological trend from macro to micro. Compared with monitoring the low voltage of users through electric meters alone, the present application can realize large-scale monitoring of the low voltage on the user side and analyze the specific causes, which is convenient for solving the problem fundamentally. Compared with building a new voltage anomaly analysis platform alone, the present application can solve the monitoring and cause analysis of the low voltage at the outlet of the substation at a very low cost through the technical solution of the present application in the existing system.

[0068] Specifically, the distribution automation system collects various information from the distribution area in real time, including voltage, current, power, distribution transformer ledger and other data, without specific limitation. By obtaining the collected information, and determining whether a low voltage event has occurred based on the voltage and current information of the distribution transformer in the collected information; and comprehensively analyzing the low voltage causes of the low voltage event based on the collected information, so as to prepare to analyze the low voltage causes including single-phase disconnection, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear and low voltage abnormality. And make smart decisions based on different causes of low voltage to obtain different conclusion information, and the low voltage event can be quickly handled based on the conclusion information.

[0069] In some optional embodiments, determining a low voltage event in a substation based on the collected information includes: obtaining a substation distribution transformer ledger of the distribution automation system; obtaining a distribution transformer three-phase voltage from a business library of the distribution automation system based on the substation distribution transformer ledger; determining a maximum voltage within a current time range based on the distribution transformer three-phase voltage, the current time range representing a time range formed by preset time points before and after the current moment; generating the low voltage event in the substation when the maximum voltage is less than 198V.

[0070] Specifically, the stored distribution transformer account of the substation is obtained from the model library of the distribution automation system, wherein the distribution transformer account of the substation refers to a recording system for managing transformers (i.e., distribution transformers) in each transformer power supply area (i.e., substation) in the distribution network, and usually includes detailed information of the transformer, such as installation location, capacity, commissioning date, power supply line, power supply user group, and user power consumption nature. And obtain telemetry data from the current moment to a period of time before (i.e., the first preset time before the current moment) from the business library of the distribution automation system, such as telemetry data from the current moment to the previous 2 hours, and the telemetry data specifically includes voltage, current, power and other data of the distribution transformer. The three-phase voltage of the distribution transformer is obtained from the telemetry data, that is, the voltage value of each phase; the maximum voltage value of the three-phase voltage of the distribution transformer is obtained from the telemetry data. If the maximum voltage value is less than 198V, it is considered that a low voltage situation occurs, and a low voltage event record is generated. At the same time, the load rate of the distribution transformer is obtained from the business library. If the load rate is greater than 0, the low voltage event is saved in the model library, and the next step of low voltage event cause analysis is performed; if the load rate is less than 0, the low voltage monitoring is terminated, the low voltage event is not saved, and the corresponding low voltage cause analysis is not performed.

[0071] In some optional embodiments, the judgment and analysis of single-phase grounding includes: obtaining the maximum value of the three-phase voltage of the distribution transformer from the business library of the distribution automation system to obtain the maximum distribution transformer voltage; obtaining the maximum value of the three-phase current of the distribution transformer from the business library to obtain the maximum distribution transformer current; calculating the three-phase imbalance according to the maximum distribution transformer voltage and the maximum distribution transformer current; when the three-phase imbalance is greater than 70%, obtaining the three-phase current of the substation at the first preset time before the current moment to obtain the normal distribution transformer current; comparing the maximum distribution transformer current with the normal distribution transformer current to obtain the current ratio; when the current ratio is greater than ten, configuring the cause of the low voltage as the single-phase grounding.

[0072] Specifically, refer to Figure 2, obtain the maximum value MAX_I of the three-phase current of the distribution transformer at the current moment from the business library, and at the same time obtain the maximum value MAX_U of the three-phase voltage of the distribution transformer. Then, according to the preset calculation formula: Unbalance = (MAX_I - MAX_U) / (MAX_I), calculate the three-phase unbalance degree Unbalance. At the same time, obtain the normal distribution transformer current of the three phases before the low voltage occurred in the distribution transformer, and divide the current maximum distribution transformer current by the normal distribution transformer current to obtain the current ratio. If the current ratio is greater than 10, it is determined that the cause of the low voltage of the distribution transformer is single-phase grounding. That is: the single-phase voltage is lower than 198V, and the two-phase voltages are higher than 230V; the phase current of the low-voltage phase is more than 10 times the phase current after the voltage rises; the three-phase unbalance degree is greater than 70%. The conclusion information obtained by the intelligent decision is: a single-phase grounding fault has occurred in a certain phase of a certain distribution transformer. Please ask the on-site personnel to handle the fault in time. According to the conclusion information, the location of the fault can be quickly found and processed quickly.

[0073] In some optional embodiments, the judgment and analysis of the single-phase disconnection include: obtaining the first voltage of each phase of the three phases at the outlet of the distribution transformer at the current moment from the business library, and the second voltage of each phase of the three phases at the first preset time before the current moment; calculating the voltage ratio of each phase of the three phases according to the first voltage and the second voltage, and the voltage ratio represents the ratio of the first voltage to the second voltage; in the case where the voltage ratio of phase A is greater than 85% and less than 115%, the voltage ratio of phase B is greater than 35% and less than 65%, and the voltage ratio of phase C is greater than or equal to 35% and less than or equal to 65%, configure the cause of the low voltage as the single-phase disconnection.

[0074] Specifically, referring to Figure 3 , obtain the voltage and current data of the distribution transformer outlet from the current moment to 2 hours ago from the business library, that is, obtain the voltage and current data of all distribution transformer outlets 2 hours before the current moment; regard the voltage and current 2 hours ago as the normal voltage and current. Divide the three-phase voltage at the current moment by the normal three-phase voltage to obtain the ratio of each phase in the three phases, that is, divide the first voltage of phase A at the current moment by the second voltage 2 hours ago to obtain the ratio aRadio, and similarly obtain bRadio and cRadio. By judging: 85% < aRadio < 115%, 35% < bRadio < 65% and 35% ≤ cRadio ≤ 65%, it is obtained that a single-phase disconnection has occurred in the distribution transformer.

[0075] The judgment of single-phase line break can also be: when a phase voltage is detected to drop suddenly to 0, and the voltages of the other two phases are reduced, ranging from 0.866 to 1 times the normal phase voltage (the voltage before the low voltage fault occurs), it can be judged that a single-phase line break occurs. When low voltage is detected, if the single-phase voltage is 0, it is necessary to push forward 2 hours (the first preset time) to obtain the correct phase voltage value (the obtained voltage value is used to calculate the voltage drop with the voltage at the time of low voltage occurrence. It is necessary to judge that the low voltage has lasted for one hour. In order to retain sufficient fault tolerance, the voltage 2 hours ago is taken as the normal voltage value). If a single-phase low voltage is detected, it is necessary to push back 2 hours to determine whether the single-phase voltage is reduced to 0 (pushing back 2 hours is to obtain whether it drops to 0 after 2 hours after the low voltage occurs), and at the same time, the voltages of the other two phases are 0.866 to 1 times the normal phase voltage.

[0076] In some optional embodiments, the judgment analysis of the three-phase imbalance includes: when the three-phase imbalance is greater than 25%, calculating a first power ratio of the power of the low-voltage phase in the three-phase voltage to the substation power; when the first power ratio is greater than 50%, configuring the cause of the low voltage as the three-phase imbalance.

[0077] Specifically, refer to Figure 4 , obtain the maximum value of the three-phase current and voltage of the distribution transformer from the business database to calculate the three-phase imbalance. When the three-phase imbalance is >25%, obtain the low-voltage phase power and the substation power. If the ratio of the low-voltage phase power to the substation power is greater than 50%, it means that the power occupied by the low-voltage phase is too large and the three-phase is unbalanced. The conclusion information obtained through smart decision-making is: the three-phase access is unbalanced, please conduct on-site investigation to verify whether it is necessary to change the single-phase to three-phase access

[0078] In some optional embodiments, the judgment and analysis of the failure of the distribution transformer outlet metering device includes: obtaining the household meter ledger of the distribution transformer from the business library of the distribution automation system; when the distribution transformer ledger in the substation is empty, grouping the household meter ledger according to the distribution transformer phase to obtain a grouped household meter ledger; obtaining the household meter telemetry data of the grouped household meter ledger; comparing the distribution transformer phase voltage with the household meter phase voltage according to the household meter telemetry data to obtain a phase voltage ratio; when the phase voltage ratio indicates that the distribution transformer phase voltage is less than the household meter phase voltage, obtaining the number of household meters whose household meter phase voltage is greater than the distribution transformer phase voltage; when the number of household meters is greater than 5, configuring the cause of the low voltage as a failure of the distribution transformer outlet metering device.

[0079] Specifically, refer to Figure 5, obtain the household meter ledger of the distribution transformer where the low voltage event occurred in the substation, and check the distribution transformer ledger in the substation. If the distribution transformer ledger in the substation is empty, the household meter ledger is grouped according to the distribution transformer phase to obtain the grouped household meter ledger. The distribution transformer phase refers to the phase difference when the low-voltage distribution transformer supplies power, which distinguishes the phases to which different users or loads belong, that is, distinguishes whether the user is connected to phase A, phase B or phase C. Obtain the household meter phase voltage and the distribution transformer phase voltage from the household meter telemetry data, and compare the distribution transformer phase voltage with the household meter phase voltage to obtain the phase voltage ratio; if the distribution transformer phase voltage is less than the household meter phase voltage, and the number of household meters with household meter phase voltage greater than the distribution transformer phase voltage is greater than 5, then the distribution transformer outlet metering device is faulty. That is, the single-phase voltage at the distribution transformer outlet is lower than 198V and greater than or equal to 150V, and the voltage of more than 5 households at the same phase end is normal. The conclusion information of the smart decision is: the metering device at the distribution transformer outlet is faulty, please verify the situation on site.

[0080] In some optional embodiments, the judgment and analysis of the low power factor includes: obtaining the maximum active power of the distribution transformer before the low voltage event occurs and the maximum power factor corresponding to the maximum active power from the business library of the distribution automation system; when the maximum power factor is less than 0.85, obtaining the maximum user active power and the substation power, and calculating a second power ratio of the maximum user active power to the substation power, the maximum user active power representing the maximum power used by a single user; when the second power ratio is greater than 40%, configuring the cause of the low voltage as the low power factor.

[0081] Specifically, refer to Figure 6 , obtain the maximum active power (TotWMax) and maximum value moment of the distribution transformer before low voltage from the business library of the distribution automation system. The maximum value moment is the moment corresponding to the maximum active power, and obtain the power factor (MaxPF) at the maximum power moment; at the same time, obtain the household meter telemetry data corresponding to the household meter ledger, and extract the maximum user active power and substation power from the household meter telemetry data. When the maximum power factor is less than 0.85, compare the second power ratio of the maximum user active power and the substation power. If the second power ratio is greater than 40%, it means that the maximum user active power is too large. The conclusion information of the intelligent decision is: there are high-power users, the power factor is insufficient, and reactive power compensation devices need to be installed.

[0082] In some alternative embodiments, the determination and analysis of low voltage anomalies include: obtaining the total active power of the distribution transformer from the business database of the distribution automation system; obtaining the three-phase current, three-phase voltage, and the maximum voltage among the three-phase voltages of the distribution from the business database; calculating an estimated value based on the total active power and the maximum voltage; in the case where the phase A current, phase B current, and phase C current are all less than the estimated value, or the phase A voltage, phase B voltage, and phase C voltage are all less than 150V, configuring the cause of the low voltage as the low voltage anomaly.

[0083] Specifically, referring to Figure 7 , an estimated value i is calculated based on the total active power TotW and the maximum voltage MAX_U, and the estimated value i = TotW / (MAX_U / 3); in the case where the phase A current, phase B current, and phase C current are all less than the estimated value i, the conclusion information of the intelligent decision-making is that the collected data is unreasonable, and please manually analyze the specific reasons, that is, the active power of the collected data is not equal to the voltage multiplied by the current multiplied by the power factor, which is a low voltage anomaly. In the case where the phase A voltage, phase B voltage, and phase C voltage are all less than 150V, the conclusion information of the intelligent decision-making is that the three-phase voltages are all lower than 150V and the collected data is unreasonable, and please manually analyze the specific reasons, that is, a low voltage anomaly. In other cases, the conclusion information of the intelligent decision-making is to please manually analyze and enter the specific reasons into the system, and the system will improve the determination strategy.

[0084] In some alternative embodiments, referring to Figure 8 , the determination and analysis of unreasonable transformer tap settings include: obtaining the household meter telemetry data from the business database of the distribution automation system; judging whether the phase A voltage UA satisfies 150V < UA < 198V, whether the phase B voltage UB satisfies 150V , < UB < 198V, and whether the phase C voltage UC satisfies 150V < UC < 198V according to the voltage information in the telemetry data. If all are satisfied, it is determined that the tap settings of the distribution transformer are unreasonable and need to be adjusted.

[0085] Implementation of the embodiments of the present invention includes the following beneficial effects: The embodiments of the present invention provide a method for analyzing the causes of low voltage in a substation, including: acquiring the collected information of the substation in real time, the collected information representing the information collected by the distribution automation system of the substation; determining the low voltage event in the substation according to the collected information; analyzing the cause of the low voltage event through the collected information to obtain the cause of the low voltage, the cause of the low voltage includes single-phase line break, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear and low voltage abnormality; making intelligent decisions according to the cause of the low voltage to obtain conclusion information. By acquiring the collected information of the existing distribution automation system and determining the low voltage event and the specific cause of the low voltage according to the collected information, low voltage monitoring and cause analysis can be achieved without adding additional equipment, which can not only analyze and determine the cause of the low voltage in the substation in real time, but also has low analysis cost and wide applicability.

[0086] like Fig. 9 As shown, in the second aspect, an embodiment of the present invention further provides a computer device, which can be a terminal. The computer device includes a processor, a memory, and a network interface connected via a system bus, wherein the memory may include a non-volatile storage medium and an internal memory. The non-volatile storage medium can store an operating system and a computer program. The computer program includes program instructions, which, when executed, enable the processor to execute any one of the methods for visualizing management of industrial equipment. The processor is used to provide computing and control capabilities to support the operation of the entire computer device. The internal memory provides an environment for the operation of the computer program in the non-volatile storage medium, which, when executed by the processor, enables the processor to execute any one of the methods for visualizing management of industrial equipment. The network interface is used for network communications, such as sending assigned tasks, etc. Those skilled in the art will appreciate that Fig. 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present disclosure, and does not constitute a limitation on the computer device to which the solution of the present disclosure is applied. The specific computer device may include Fig. 9More or less components shown in, or some components are combined, or there are different component arrangements. It should be understood that the processor can be a central processing unit (CPU), and the processor can also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. Among them, in one embodiment, the above-mentioned processor is used to run a computer program stored in a memory to implement the following steps: real-time acquisition of collected information of the substation, the collected information representing information collected by the distribution automation system of the substation; determining the low voltage event of the substation based on the collected information; analyzing the cause of the low voltage event through the collected information to obtain the cause of the low voltage, the cause of the low voltage includes single-phase line break, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear and low voltage abnormality; making intelligent decisions based on the cause of the low voltage to obtain conclusion information.

[0087] It can be seen that the contents of the above method embodiments are all applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0088] In addition, the embodiment of the present application also discloses a computer program product or a computer program, and the computer program product or the computer program is stored in a computer-readable storage medium. The processor of the computer device can read the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device performs the above method. Similarly, the contents in the above method embodiment are all applicable to the storage medium embodiment, and the functions specifically implemented by the storage medium embodiment are the same as those in the above method embodiment, and the beneficial effects achieved are also the same as those achieved by the above method embodiment.

[0089] It is understood that all or some steps and systems in the disclosed method above can be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components can be implemented as processors, such as software executed by a central processing unit, a digital information processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other power distribution network technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, magnetic tape, disk storage or other magnetic storage device, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media generally contain computer readable instructions, data structures, program modules, or other data in modulated data information such as carrier waves or other transport mechanisms, and may include any information delivery media.

[0090] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A method for analyzing the causes of low voltage in a substation, characterized in that: include: Acquire the collected information of the substation in real time, wherein the collected information represents the information collected by the distribution automation system of the substation; Determine a low voltage event in the substation according to the collected information; Analyzing the cause of the low voltage event through the collected information to obtain the cause of the low voltage, wherein the cause of the low voltage includes single-phase disconnection, single-phase grounding, three-phase imbalance, distribution transformer outlet metering device failure, low power factor, unreasonable transformer gear position and low voltage abnormality; Make intelligent decisions based on the causes of low voltage and obtain conclusion information.

2. The method according to claim 1, characterized in that The step of determining the low voltage event of the substation according to the collected information includes: Obtain the distribution transformer account of the distribution automation system; Obtaining the three-phase voltage of the distribution transformer from the business library of the distribution automation system according to the distribution transformer account of the substation area; Determine the maximum voltage within a current time range according to the three-phase voltage of the distribution transformer, wherein the current time range represents a time range formed by preset time points before and after the current moment; When the maximum voltage is less than 198 V, the low voltage event of the stage is generated.

3. The method according to claim 1, characterized in that The single-phase grounding judgment and analysis includes: Obtaining the maximum value of the three-phase voltage of the distribution transformer from the service library of the distribution automation system to obtain the maximum distribution transformer voltage; Obtaining the maximum value of the three-phase current of the distribution transformer from the business database to obtain the maximum distribution transformer current; Calculate the three-phase imbalance degree according to the maximum distribution transformer voltage and the maximum distribution transformer current; When the three-phase imbalance is greater than 70%, the three-phase current of the transformer area at the first preset time before the current moment is obtained to obtain the normal distribution transformer current; Comparing the maximum distribution transformer current with the normal distribution transformer current to obtain a current ratio; When the current ratio is greater than ten, the low voltage cause is configured as the single-phase grounding.

4. The method according to claim 1, characterized in that: The judgment and analysis of single-phase disconnection includes: Obtaining from the business database a first voltage of each of the three phases at the distribution transformer outlet at the current moment, and a second voltage of each of the three phases at a first preset time before the current moment; Calculating a voltage ratio of each phase in three phases according to the first voltage and the second voltage, wherein the voltage ratio represents a ratio of the first voltage to the second voltage; When the voltage ratio of phase A is greater than 85% and less than 115%, the voltage ratio of phase B is greater than 35% and less than 65%, and the voltage ratio of phase C is greater than or equal to 35% and less than or equal to 65%, the low voltage cause is configured as the single-phase line break.

5. The method according to claim 3, characterized in that: The judgment and analysis of the three-phase imbalance includes: When the three-phase imbalance is greater than 25%, a first power ratio of the power of the low-voltage phase in the three-phase voltage to the substation power is calculated; When the first power ratio is greater than 50%, the low voltage cause is configured as the three-phase imbalance.

6. The method according to claim 2, characterized in that The judgment and analysis of the failure of the distribution transformer outlet metering device includes: Obtaining the household meter ledger of the distribution transformer from the business library of the distribution automation system; When the distribution transformer account in the substation area is empty, the household meter account is grouped according to the distribution transformer phase to obtain a grouped household meter account; Obtaining household meter telemetry data of the grouped household meter ledger; According to the household meter telemetry data, the phase voltage of the transformer is compared with the phase voltage of the household meter to obtain a phase voltage ratio; When the phase voltage ratio indicates that the distribution transformer phase voltage is less than the household meter phase voltage, the number of household meters whose household meter phase voltage is greater than the distribution transformer phase voltage is obtained; When the number of household meters is greater than 5, the cause of the low voltage is configured as a failure of the distribution transformer outlet metering device.

7. The method according to claim 6, characterized in that The judgment and analysis of low power factor includes: Acquire the maximum active power of the distribution transformer before the low voltage event occurs and the maximum power factor corresponding to the maximum active power from the service library of the distribution automation system; When the maximum power factor is less than 0.85, obtaining the maximum user active power and the area power, and calculating a second power ratio of the maximum user active power to the area power, wherein the maximum user active power represents the maximum power used by a single user; When the second power ratio is greater than 40%, the low voltage cause is configured as the power factor is low.

8. The method according to claim 1, characterized in that The judgment and analysis of the low voltage abnormality includes: Obtaining the total active power of the distribution transformer from the service library of the distribution automation system; Obtain the allocated three-phase current, three-phase voltage and the maximum voltage among the three-phase voltages from the business database; Calculating an estimated value according to the total active power and the maximum voltage; When the A-phase current, the B-phase current and the C-phase current are all smaller than the estimated value, or the A-phase voltage, the B-phase voltage and the C-phase voltage are all smaller than 150 V, the low voltage cause is configured as the low voltage abnormality.

9. A computer device, wherein: The computer device comprises a processor, a memory, and a computer program stored in the memory and executable by the processor, wherein when the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium storing a program executable by a processor, characterized in that: The processor-executable program is used to perform the method according to any one of claims 1 to 8 when executed by the processor.

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