A method for monitoring line loss abnormality of a distribution transformer area

Abstract

The application discloses a kind of problems monitoring methods of abnormal line loss of distribution transformer area, comprising: respectively installing area data checking instrument at all area concentrators in the same power supply area, system data acquisition is carried out;According to the intelligent diagnosis method of measurement loop, the real-time data collected are diagnosed, and the abnormal state is found out;According to the abnormal state, the type of line loss abnormal problem is determined;According to the type of determined abnormal problem, corresponding processing measures are taken by comparing with preset rules.The method intelligently analyzes and diagnoses possible problems, provides reference suggestions for solving similar problems, further standardizes line loss management behavior, improves management level, and finally effectively reduces line loss rate.The method can accurately locate the problem and provide corresponding solutions, improving work efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power grid, and particularly relates to a distribution transformer station area line loss abnormality monitoring method. BACKGROUND

[0002] Line loss rate is the percentage of the loss of electric energy in the transmission process and the supply of electric energy to the power grid, and is a main index for evaluating the loss level of the power grid. Line loss management and calculation analysis are of great significance for reducing line loss and improving enterprise economic benefits in the power system.

[0003] The deficiency of line loss calculation methods and means restricts the progress of loss reduction work. Although remote collection of monitoring data of the distribution network has been realized in some regions of China, and intelligent information systems have been developed, and information systems for each level of power user side have also been developed, due to different system developers and different initial intentions, when facing the proposition of reducing the line loss of the distribution network, how to coordinate the role of each system, how to calculate the line loss value of the distribution network, and how to guide the loss reduction practice of the relevant departments, there are still certain difficulties at present.

[0004] Line loss is divided into theoretical line loss and statistical line loss. The theoretical line loss is the loss that cannot be avoided in the process of transmitting and distributing electric energy, and is determined by the load condition of the power grid at that time and the parameters of the power supply equipment. This part of loss can be obtained by theoretical calculation, and mainly includes variable losses such as copper loss of overhead transmission and distribution lines and cable conductors at each voltage level, transformer copper loss, iron loss of devices such as phase modulators, voltage regulators, reactors, wave traps and arc suppression coils. The statistical line loss is calculated according to the energy meter index, and is the difference between the power supply and the power sales. The difference between the statistical line loss and the theoretical line loss is called the management line loss, which specifically refers to other losses and various unknown losses in the actual operation of the power grid. For example, due to the error of the user's electric energy meter, the reading of the electric energy meter is smaller; the reading of the user's electric energy meter is missed, wrong, the insulation of the live equipment is poor and the electric energy is lost, and the electric energy without the electric energy meter and the electric energy stolen are lost.

[0005] The loss reduction of the distribution network is one of the main targets of energy saving work, and the loss of electric energy in the power grid is not only related to the operation mode, network structure and voltage level of the entire power grid, but also affected by the management level of dispatching, operation and maintenance. The calculation of the theoretical line loss has guiding significance for loss reduction and energy saving and fine and accurate line loss management. In the prior art, generally, it takes 2-3 days for an inspector to complete the entire station area through carpet type patrol in a high loss station area, which is low in efficiency. Therefore, it is urgent to monitor the line loss abnormality of the distribution transformer station area, and then take specific measures for specific problems. SUMMARY

[0006] The main purpose of the present application is to solve the above-mentioned problem of monitoring the line loss anomaly of the distribution transformer area, and provide a line loss anomaly monitoring method for the distribution transformer area.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0008] The embodiment of the present application provides a line loss anomaly monitoring method for the distribution transformer area, comprising:

[0009] The data checkers are respectively installed at all concentrators in the same power supply area to collect system data;

[0010] According to the intelligent diagnosis method of the metering loop, the collected real-time data are diagnosed to find out the abnormal state; according to the abnormal state, the type of the line loss anomaly problem is determined;

[0011] According to the determined type of the abnormal problem, the corresponding processing measures are taken according to the preset rules.

[0012] In one embodiment, according to the abnormal state, the type of the line loss anomaly problem is determined, comprising:

[0013] When the line loss rate in the preset period exceeds the first preset threshold, it is determined that the corresponding transformer area is a high line loss problem; the high line loss problem includes: household transformer relationship error, metering device category 1 fault, electricity stealing and collection problem;

[0014] When the line loss rate in the preset period is lower than the second preset threshold, it is determined that the corresponding transformer area is a negative line loss problem; the negative line loss problem includes: household transformer relationship error, metering device category 2 fault and collection problem.

[0015] In one embodiment, according to the determined type of the abnormal problem, the corresponding processing measures are taken according to the preset rules, comprising:

[0016] When the determined abnormal problem belongs to the household transformer relationship error, the big data fuzzy algorithm is used to uniformly analyze multiple transformer areas in the same power supply area to ensure that the transformer household relationship is completely consistent or the transformer area intelligent diagnosis robot is installed to automatically identify the transformer household relationship.

[0017] In one embodiment, according to the determined type of the abnormal problem, the corresponding processing measures are taken according to the preset rules, further comprising:

[0018] When the determined abnormal problem belongs to the metering device category 1 fault, the analysis is respectively performed from the examination table ratio and the user table ratio;

[0019] The examination table ratio: the transformer capacity in the system file is used to estimate the required mutual inductor ratio, and then the on-site CT ratio check instrument is verified;

[0020] User meter ratio: estimate whether the electricity consumption is greatly different from the meter statistics electricity consumption through user type and electricity consumption.

[0021] In one embodiment, further comprising:

[0022] When the determined abnormal problem belongs to the metering device category fault, the clock deviation of the meter under the transformer area is checked through the background calling of the acquisition system, or the three-phase load balance of the transformer area is checked through the background calling of the acquisition system.

[0023] In one embodiment, according to the type of the determined abnormal problem, the corresponding processing measures are taken by comparing with the preset rules, further comprising:

[0024] When the determined abnormal problem belongs to electricity stealing, whether the intelligent electric energy meter wiring under the transformer area is correct, and whether the current and voltage are normal are automatically identified through the installation of the transformer area intelligent diagnosis robot.

[0025] In one embodiment, according to the type of the determined abnormal problem, the corresponding processing measures are taken by comparing with the preset rules, further comprising:

[0026] When the determined abnormal problem belongs to the acquisition problem, whether the concentrator is wrongly hung, the electric energy meter transverse block is damaged, and the system parameter setting is correct are analyzed.

[0027] In one embodiment, according to the type of the determined abnormal problem, the corresponding processing measures are taken by comparing with the preset rules, comprising:

[0028] When the determined abnormal problem belongs to the metering device category fault, the meter ratio and the user meter ratio are analyzed respectively.

[0029] The examination meter ratio is estimated by the transformer capacity in the system file, the required mutual inductor ratio is estimated, and the CT variable ratio on-site verification instrument is verified.

[0030] The user meter ratio is estimated by the user type and the electricity consumption.

[0031] In one embodiment, further comprising:

[0032] When the determined abnormal problem belongs to the metering device category fault, the total meter voltage, current, power factor, phase angle in the acquisition system are called to analyze whether the total meter wiring exists problems.

[0033] Compared with the prior art, the present application has the following beneficial effects:

[0034] The application provides a kind of distribution transformer area line loss abnormal problem monitoring method, comprising: installing area data verification instrument at all area concentrators in the same power supply area, and collecting system data;According to the intelligent diagnosis method of measurement loop, the real-time data collected are diagnosed to find out abnormal state;According to the abnormal state, the type of line loss abnormal problem is determined;According to the type of abnormal problem determined, the corresponding processing measures are taken according to the preset rules.The method intelligently analyzes and diagnoses possible problems, provides reference suggestions for solving similar problems, further standardizes the management behavior of line loss, improves the management level, and finally effectively reduces the line loss rate.Accurately locate the problem and give the corresponding solution, improve the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A distribution transformer area line loss abnormal problem monitoring method flow chart is provided for the embodiments of the application.

[0036] Figure 2 The installation area data verification instrument diagnosis schematic diagram is provided for the embodiments of the application. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application will be further described below in combination with specific embodiments.

[0038] In the description of the application, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end" and "the other end" is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "install", "provided with", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside.For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0040] The reasons affecting the statistics line loss of the transformer area are various, in addition to the inherent error existing in the power calculation device when performing power measurement, the overall factors can be divided into two aspects; One is the internal factor, namely calculation management, which can be roughly summarized as three categories: household transformer relationship, metering device failure, collection problem; The second is the external factor, namely power management, mainly the work of the camp and the customer's electricity stealing behavior. For specific abnormal reasons, referring to Figure 1 The present application provides a kind of transformer area line loss abnormal problem monitoring method, comprising:

[0041] S10, install transformer area data check instrument at all area concentrators in the same power supply area, and perform system data acquisition;

[0042] S20, according to the measurement loop intelligent diagnosis method, the collected real-time data are diagnosed, and the abnormal state is found out;According to the abnormal state, the type of line loss abnormal problem is determined;

[0043] S30, according to the type of abnormal problem determined, corresponding processing measures are taken according to the preset rule.

[0044] The above each step will be described in detail.

[0045] In the above step S10, the multi-area concentrator management of the same power supply area is selected as a unit of a small area or a village, and the adjacent or associated power supply area is selected for centralized analysis and management. Referring to Figure 2 The transformer area data check instrument is installed at all area concentrators, and system data acquisition is performed.

[0046] In the above steps S20-S30, according to the analysis and investigation scheme proposed by different line loss problem cooperation units, there are mainly two types: high loss problem and negative loss problem;And the two problems are analyzed and corresponding processing measures are given.

[0047] (1) High line loss problem and analysis and investigation of illegal

[0048] High-loss transformer area refers to the abnormal transformer area whose line loss rate in the preset period (such as 24 hours, one week, one month, etc.) exceeds the index requirement (the first preset threshold). There are mainly two situations: long-term high loss and sudden high loss.

[0049] The main reasons for long-term high-loss transformer area can be divided into four categories: household transformer relationship error, metering device failure, electricity stealing, and collection problem.

[0050] Household relationship error: the number of system archive users does not match the actual number of users in the field, mainly because the user's electric energy meter appears across the area (the field user uses electricity in A area, the system archive is hung in B area, resulting in less electricity consumption in A area), causing electricity consumption statistics error or meter reading failure. System archives are inconsistent with the field (commonly known as black households), marketing or collection system archives are not synchronized with the field, and archive information lags behind the field meter replacement and household establishment, resulting in less electricity consumption.

[0051] Solution: A uses big data fuzzy algorithm to analyze multiple areas in the same power supply area (analysis can be done through system archive information, concentrator data, collection, etc. Suspicious user electricity consumption is calculated, and finally verified in the field), must ensure that the relationship between the area and the household is completely consistent. B installs an intelligent diagnostic robot in the area to automatically identify the relationship between the area and the household. C For users who cannot determine the relationship between the area and the household, the area identification instrument can be used for verification. D For users whose system archives are inconsistent with the field, tables should be installed and archives should be established on the same day.

[0052] Metering device class failure: The power of the area under the electric energy meter (total meter, user electric energy meter), the system archive does not match the actual rate in the field: area equipment aging (insufficient reactive power compensation), resulting in low power factor, area loss will increase; internal failure, burning, and different sales of user electric energy meters under the area; user electric energy meter transformer damage, secondary no current or small current, resulting in less electricity consumption in the area; the area table meter sends out super-capacity electricity consumption, resulting in actual electricity consumption not being counted in statistics (calculation method: electricity consumption exceeds the threshold of "transformer (user) capacity * 24 * 2 * number of days"); old and damaged power lines, resulting in line leakage, resulting in power loss; Uneven distribution of three-phase load in the area, increased distribution loss.

[0053] Solutions: A. Check the transformer capacity in the system file to estimate the required transformer ratio, and then use the CT ratio verification instrument on site to verify whether the ratio is incorrect or the on-site power load is mismatched. Check the user type and power consumption to estimate whether there is a large error between the power consumption and the meter statistics, and then check whether the ratio is correct and the transformer is damaged on site. Before installing the transformer, make sure to verify it to avoid inconsistencies between the actual ratio and the nameplate. B. If the meter measurement may have problems during the on-site copy process, check the meter on site for faults or burning, and replace the new electric energy meter in time if there is one, and synchronize the on-site system file. C. Check the clock deviation of the meter under the transformer area through the background measurement of the collection system, and if there is a deviation, please contact the electric energy meter manufacturer for correction or replacement of a new electric energy meter. D. Check whether the three-phase load of the transformer area is balanced through the background measurement of the collection system. E. Replace the old and damaged power supply line in time. F. Check whether the meter is over capacity through the transformer (user) capacity.

[0054] Electricity theft: mainly refers to the private wiring or bypassing of the metering device by the user under the transformer area. In urban network transformer areas, electricity theft is mainly concentrated in street shops, hotels, hotels, community properties, entertainment venues, and temporary electricity users with large power consumption. There are also a small number of residential electricity theft. In rural network transformer areas, electricity theft is mainly caused by private wiring and temporary electricity for house building, irrigation, etc.

[0055] Common electricity theft methods by bypassing the metering device: changing the fire line and zero line of the electric energy meter, short-circuiting the fire line, virtual connection of the voltage line, reversing the secondary phase sequence, changing the permanent magnet position, reducing the gap between the magnet and the aluminum disc, changing the phase sequence of the current line and the voltage line, opening the voltage connecting piece, and remotely controlling the electricity stealing device behind the electric energy meter terminal box or joint terminal box.

[0056] Solutions: The transformer area data verification instrument or intelligent diagnosis robot (the present embodiment does not limit this, and the existing data verification instrument or intelligent diagnosis robot on the market can be used) can be installed to automatically identify whether the intelligent electric energy meter wiring under the transformer area is correct, whether the current and voltage are normal, and whether the residents privately open the meter cover on site. For users who bypass the metering device or use mechanical meters, the on-site personnel need to investigate.

[0057] Recommendations: The above are all common methods of electricity theft, but it can be seen that almost all of them involve direct contact with or alteration of the electricity metering device to achieve their purpose. A. Strengthen the technical transformation of electricity metering devices, such as changing the current transformer, secondary metering circuit, electricity meter, and junction box to a closed metering system. B. For residents, adopt centralized meter boxes or fully enclosed meter boxes, i.e., wires entering through conduits, conduits entering boxes, and the boxes being locked and sealed with lead. C. Strengthen the handling of electricity theft users and enhance technical transformation.

[0058] Data collection issues: Data collection from some users' electricity meters in the substation area has been failing for a long time. The data collection system will either supplement the electricity consumption or use incomplete data for statistics. The electricity meter parameters in the data collection system are set incorrectly, causing a discrepancy between the electricity consumption and the actual electricity consumption.

[0059] Solutions: For users experiencing data collection failures, first conduct a system analysis to check for issues such as incorrect concentrator connection, damaged electricity meter modules, and incorrect system parameter settings. Then, verify on-site to ensure that the correct data collection rate for all users consuming electricity within the transformer substation reaches 100%. Photovoltaic user electricity consumption data collection issues: For users connected to photovoltaic power generation within the transformer substation, incorrect data collection of their electricity consumption leads to errors in the substation's electricity consumption statistics, resulting in high losses in the substation. Sudden high line loss in substation statistics refers to a situation where the substation's original line loss rate remained stable, but the daily line loss rate suddenly changes. The reasons for this phenomenon can be summarized as follows:

[0060] A new user was added, or the user's area was changed, but the system was not updated in time, resulting in a change in the user-transformation relationship.

[0061] Data collection for users' electricity meters in area B failed.

[0062] C-concentrator or carrier failure.

[0063] User D's current transformer is damaged.

[0064] E. New users and users who need to change their meters have incorrect wiring.

[0065] The actual current transformer ratio of newly added or changed users is inconsistent with the current transformer nameplate markings.

[0066] G adds temporary electricity consumption without meters or with mechanical meters.

[0067] Severe weather conditions caused an electrical leakage.

[0068] I. Users steal electricity within a short period of time or fail to detect and recover stolen electricity within the statistical electricity consumption period.

[0069] Solution: In the event of a sudden high loss, prioritize data analysis of changes in line loss through the system, and then conduct on-site verification.

[0070] Common problems: 1. The power supply changes little, and the power supply suddenly decreases. Is there a collection failure, or a sudden decrease in individual user electricity consumption? 2. The power supply suddenly increases, and the power supply changes little. Is there a new user, or a stolen electricity site?

[0071] (2) Negative line loss problem and treatment method

[0072] Negative loss area refers to an abnormal area whose line loss rate is less than 0% (second preset threshold) within the statistical period (preset period) of the electricity information collection system. The main symptoms are long-term negative loss, sudden negative loss, and small negative loss.

[0073] The main reasons for long-term negative loss and small negative loss can be divided into three categories: household variable relationship error, metering device Class II fault, and collection problem. Household variable relationship error refers to the inconsistency between the marketing and collection system area users and the actual situation on site, or the inconsistency between the total table and concentrator configuration and the field.

[0074] Solution: The solution is the same as handling high-loss household variable relationship.

[0075] Metering device faults mainly include:

[0076] A. The total table or user electric energy meter ratio of the marketing and collection system is inconsistent with the field (mainly the total table transformer system ratio is less than the actual field ratio, or the user transformer file ratio is greater than the actual field ratio). B. Total table wiring error: common zero line sharing, current out-line interconnection, three-phase transformer interconnection, electric energy meter three-phase out-line interconnection, current polarity reverse connection. Total table secondary voltage virtual connection. C. Connection box current connection error or connection box damage, resulting in current short circuit and virtual connection. D. Electric energy meter clock deviation (user table clock is later than total table clock), resulting in total table first data freeze with user electric energy meter. E. User electricity is connected before the total table of the area, resulting in part of the power supply not being counted in the total table of the area. F. Unreasonable transformer configuration (field operation load does not meet the configuration requirements), which will usually cause small negative loss in the area. G. Unbalanced three-phase load (one of the currents of the total table exceeds the rated value or the three-phase imbalance is much larger than the standard value (15%), which will cause small negative loss in the area.

[0077] Solution: A total table ratio and user electric energy meter ratio problem processing method is consistent with high loss method. B can call the total table voltage, current, power factor, phase angle in the acquisition system to analyze whether the total table wiring exists problems. Call the abnormal data mainly performance voltage lack phase, current loss flow or the same, power factor is low, phase angle error and so on, and then check the total table wiring situation on site. C the clock of electric energy meter appears deviation needs to contact the manufacturer to correct or replace new electric energy meter. D for user electricity in the total table front wiring, needs to improve the line. E first from the acquisition system to call the total table current curve and load condition, calculate whether there exists unreasonable mutual inductor configuration and three-phase load balance condition, if exists, needs to replace reasonable mutual inductor configuration and adjust three-phase load condition.

[0078] Acquisition problem: for the user corresponding to acquisition failure, the acquisition system will complete the system to the user electric energy meter bottom code that is not acquired, and the completed data will be greater than the actual data on site during the completion process.

[0079] Solution: firstly, the acquisition failure user is analyzed whether there exists concentrator hanging error and whether the system parameter setting is correct, then the on-site verification is carried out, and the correct acquisition rate of the user in the area must reach 100%. The sudden negative loss phenomenon refers to the sudden 0% line loss rate of the area for more than 3 days. The reasons for the sudden negative loss phenomenon include the following points: the abnormal voltage or current of the total table leads to the negative loss of the area; the sudden failure of the user electric energy meter leads to the electric energy meter value flying away; the total table failure or burning leads to the incorrect measurement of power supply; the user under the area changes, but the system does not update the file in time, leading to the error of the user relationship; the user under the area exists bidirectional power supply (in order to ensure normal use of electricity, in special period, the use of electricity in two adjacent areas is changed, and the file information is not adjusted in time in the system, leading to the sudden negative loss of one of the areas).

[0080] Solution: A calls the total table voltage, current, power factor in the acquisition system, mainly performance voltage loss, abnormal power factor. On-site check total table current line or voltage line loosening or copper aluminum oxidation, check whether the screw of the wiring box exists loosening or oxidation phenomenon. B the electric quantity of the user electric energy meter flies away, generally due to external force or self damage, needs to replace the electric energy meter. C when the user relationship under the area changes, the system file information is not adjusted in time.

[0081] The monitoring method for the abnormal problem of line loss of the distribution transformer area provided by the embodiment of the application has the following advantages:

[0082] (1) automatic diagnosis: the area data checking instrument can diagnose the key data of all user electric meters hung under the area, automatically detect communication conflict, and does not affect the data reading of the area electric meter.

[0083] (2) Intelligent analysis: the intelligent diagnosis technology of the metering circuit is adopted to diagnose the electric quantity parameters of the user, find out the abnormal state, and determine the type of the line loss abnormal problem according to the abnormal state.

[0084] (3) Processing measures: finally, the system reasons and the types of the abnormal reasons of the transformer area line loss are summarized, a file report can be formed, and the corresponding processing measures can be selected according to the problem type.

[0085] The method realizes accurate positioning of the line loss problem, determines the problem type, can save manpower, and only needs to install the data checking instrument on the concentrator of the transformer area to collect data, so that all suspicious users under the transformer area can be diagnosed, the instrument can be installed under power, is convenient to use and easy to operate, greatly improves the work efficiency of the electric power inspection personnel, and is a sharp weapon for the electric power inspection personnel to reduce loss and increase efficiency.

[0086] The method has strong universality and can be applied to all transformer areas within the scope of the State Grid Company. Considering the large number of transformer areas and the complex electric power consumption conditions of customers and many other problems, the universal design completely solves the problem of reducing loss of the transformer area of the State Grid Company, has strong practicability, fills the gap in the industry, changes the traditional inspection mode of the inspection personnel, shortens the inspection cycle, and under normal circumstances, the inspection personnel needs 2-3 days to complete the entire inspection of a high-loss transformer area, but after the line loss abnormal problem of the distribution transformer area is monitored based on the method provided by the application, the inspection personnel only needs to obtain the diagnosis result at the transformer area for a fixed time, which effectively improves the work efficiency of the inspection personnel, reduces the work burden of the inspection personnel, and completely solves the problem of insufficient personnel.

[0087] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A method for monitoring abnormal line loss in distribution transformer areas, characterized in that: The method comprises the following steps: S10, installing a power supply area data verification instrument at each power supply area concentrator in the same power supply area to collect system data; S20, diagnosing the collected real-time data according to a metering loop intelligent diagnosis method to find out abnormal states, and determining the type of line loss abnormal problem according to the abnormal states; S30, taking corresponding processing measures according to the determined type of abnormal problem according to preset rules; In step S20, the type of line loss abnormal problem is determined according to the abnormal states, which comprises: When the line loss rate in a preset period exceeds a first preset threshold, it is determined that the corresponding power supply area is a high line loss problem; the high line loss problem comprises: household transformer relationship error, metering device type 1 fault, electricity stealing and collection problem; When the line loss rate in a preset period is lower than a second preset threshold, it is determined that the corresponding power supply area is a negative line loss problem; the negative line loss problem comprises: household transformer relationship error, metering device type 2 fault and collection problem; In step S30, corresponding processing measures are taken according to the determined type of abnormal problem according to preset rules, which comprises: When the determined abnormal problem belongs to household transformer relationship error, multiple power supply areas in the same power supply area are analyzed uniformly through a big data fuzzy algorithm to ensure that the household transformer relationship is completely consistent or a power supply area intelligent diagnosis robot is installed to automatically identify the household transformer relationship; When the determined abnormal problem belongs to metering device type 1 fault, the analysis is performed from the examination table ratio and the user table ratio; wherein, the examination table ratio: the required transformer ratio is estimated according to the transformer capacity in the system file, and then the CT ratio verification instrument on site is verified; the user table ratio: whether there is a large error between the electricity consumption and the metering statistics is estimated according to the user type and the electricity consumption.

2. The method according to claim 1, characterized in that: When the determined abnormal problem belongs to metering device type 1 fault, it further comprises: The clock deviation of the meter under the power supply area is checked through the background call of the collection system; or whether the three-phase load of the power supply area is balanced is checked through the background call of the collection system.

3. The method according to claim 1, characterized in that: According to the determined type of abnormal problem, corresponding processing measures are taken according to preset rules, which further comprises: When the determined abnormal problem belongs to electricity stealing, whether the connection of the intelligent electric energy meter under the power supply area is correct, and whether the current and voltage are normal are automatically identified through the installation of the power supply area intelligent diagnosis robot.

4. The method according to claim 1, characterized in that: According to the determined type of abnormal problem, corresponding processing measures are taken according to preset rules, which further comprises: When the determined abnormal problem belongs to collection problem, whether the concentrator is wrongly hung, the electric energy meter horizontal block is damaged and the system parameter setting is correct is analyzed through the system.

5. The method for monitoring the line loss abnormal problem of the distribution transformer area according to claim 1, characterized in that: According to the determined type of abnormal problem, corresponding processing measures are taken according to preset rules, which further comprises: When the determined abnormal problem belongs to metering device type 2 fault, the analysis is performed from the examination table ratio and the user table ratio; Wherein, the examination table ratio: the required transformer ratio is estimated according to the transformer capacity in the system file, and then the CT ratio verification instrument on site is verified; The user table ratio: whether there is a large error between the electricity consumption and the metering statistics is estimated according to the user type and the electricity consumption.

6. The method according to claim 1, characterized in that: According to the determined type of the abnormal problem, corresponding processing measures are taken according to preset rules, and the method further includes: When the determined abnormal problem is a Class II fault of the metering device, the total meter voltage, current, power factor and phase angle are called in the collection system for analysis to determine whether there is a problem with the total meter wiring.

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