阅读说明：本技术 一种低压计量箱内电能表故障诊断维护方法 (Fault diagnosis and maintenance method for electric energy meter in low-voltage metering box ) 是由 顾哲伟 董勤飞 洪宇峰 张钟其 周伟杰 姚新曙 马泰 于 2020-12-22 设计创作，主要内容包括：本发明公开了一种低压计量箱内电能表故障诊断维护方法,包括：初始数据采集：在模拟实验中将低压计量箱连接电网及模拟负载,调整电能表故障因素以损坏电能表,直至低压计量箱出现故障,记录故障类型、对应的异常参数以及电能表故障因素,得到故障表；故障分析：采集出现故障的低压计量箱的故障参数,结合故障表的异常参数,根据匹配度是否达到阈值判断是否为电能表故障,如是则记录对应电能表故障因素并切换备用电能表；预警指示：检查区域内未出现故障的低压计量箱的条件因素与对应电能表故障因素的相似度,对高于阈值的进行指示。本发明针对电能表故障问题,通过切换至备用电能表供电的方式恢复故障用户的供电,将用户的停电时间降到最低。(The invention discloses a fault diagnosis and maintenance method for an electric energy meter in a low-voltage metering box, which comprises the following steps: initial data acquisition: in a simulation experiment, connecting a low-voltage metering box with a power grid and a simulation load, adjusting fault factors of an electric energy meter to damage the electric energy meter until the low-voltage metering box breaks down, and recording fault types, corresponding abnormal parameters and the fault factors of the electric energy meter to obtain a fault meter; and (3) fault analysis: collecting fault parameters of a low-voltage metering box with a fault, judging whether the fault is an electric energy meter fault according to whether the matching degree reaches a threshold value or not by combining abnormal parameters of a fault meter, and if so, recording fault factors of the corresponding electric energy meter and switching a standby electric energy meter; early warning indication: and (4) detecting the similarity between the condition factors of the low-voltage metering box without faults in the region and the fault factors of the corresponding electric energy meter, and indicating that the condition factors are higher than the threshold value. Aiming at the problem of electric energy meter failure, the invention recovers the power supply of the failed user by switching to the standby electric energy meter power supply mode, thereby reducing the power failure time of the user to the minimum.)

1. A fault diagnosis and maintenance method for an electric energy meter in a low-voltage metering box is characterized by comprising the following steps:

initial data acquisition: in a simulation experiment, connecting a low-voltage metering box with a power grid and a simulation load, adjusting fault factors of an electric energy meter to damage the electric energy meter until the low-voltage metering box breaks down, and recording fault types, corresponding abnormal parameters and the fault factors of the electric energy meter to obtain a fault meter;

and (3) fault analysis: collecting fault parameters of a low-voltage metering box with a fault, judging whether the fault is an electric energy meter fault according to whether the matching degree reaches a threshold value or not by combining abnormal parameters of a fault meter, and if so, recording fault factors of the corresponding electric energy meter and switching a standby electric energy meter;

early warning indication: and (4) detecting the similarity between the condition factors of the low-voltage metering box without faults in the region and the fault factors of the corresponding electric energy meter, and indicating that the condition factors are higher than the threshold value.

2. The method for diagnosing and maintaining the fault of the electric energy meter in the low-pressure metering tank as claimed in claim 1, wherein the fault factors of the electric energy meter comprise: load, temperature, humidity and structural damage.

3. The method for fault diagnosis and maintenance of the electric energy meter in the low-pressure metering tank as claimed in claim 1 or 2, wherein the abnormal parameter detection range comprises: and (3) carrying out weight distribution of fault parameters on each electric energy meter fault factor in the fault meter according to the change curves of the node voltage and the node current.

4. The method for fault diagnosis and maintenance of the electric energy meter in the low-pressure metering tank as claimed in claim 1, wherein the calculation process of the matching degree comprises the following steps: and calculating the sample deviation degree of each parameter according to the fault parameters and the abnormal parameters of the fault table, and counting the total value of the sample deviation degrees after the weight is superimposed to obtain the matching degree.

5. The method for fault diagnosis and maintenance of the electric energy meter in the low-pressure metering tank as claimed in claim 1, wherein the calculation process of the similarity comprises the following steps: and calculating the sample deviation degree of each condition factor according to the condition factors and the electric energy meter fault factors of the fault meter, and counting the total value of the sample deviation degrees after the weight is superimposed to obtain the matching degree.

6. The method for fault diagnosis and maintenance of the electric energy meter in the low-voltage metering tank as claimed in claim 1, wherein the process of switching the standby electric energy meter comprises the following steps: and cutting off the corresponding fault electric energy meter line, switching to the standby electric energy meter line, and recovering the power supply of the user.

Technical Field

The invention belongs to the field of fault diagnosis, and particularly relates to a fault diagnosis and maintenance method for an electric energy meter in a low-voltage metering box.

Background

The low-pressure metering box is used for the important task of electricity metering and charging and needs to be continuously and stably operated. Because the field environment is complex, the low-pressure metering box is influenced by long-term severe temperature and humidity changes, thunder, power grid fluctuation, electromagnetic interference and the like, and the low-pressure metering box inevitably breaks down under the influence of external environment and load factors, so that the maintenance cost is increased, the repair rate of a user is increased, and the income performance of staff of a primary power supply station is indirectly influenced. In China, hundreds of millions of power consumers exist, the number of low-voltage metering boxes is large, and fault diagnosis of a power grid company for the low-voltage metering boxes is also in urgent need of enhancement.

The low-voltage metering box is the essential equipment of user's power consumption, and the low-voltage metering box is concerned with user's power consumption benefit, in case break down will influence user's normal power consumption, and the electroless phenomenon of common user divide into external line power failure, batch meter self trouble and interior line trouble three kinds of types, and wherein two kinds of reasons in the front belong to power supply company and salvage the scope, and interior line trouble then needs the user to maintain by oneself and solve. At present, in urban residential districts in China, a metering device for low-voltage electricity consumption of residents generally adopts a centralized metering box, the specific form is that the centralized metering box is generally installed in a unit corridor, and an electric energy meter of each family in the unit corridor is respectively installed in the centralized metering box. When the reason of power failure does not belong to external line power failure and internal line fault, the basic fault power failure reason is caused by electric energy meter burning, because the contact position of the cable and the electric energy meter is only fixed by screw rotation, after long-term use, the metal contact surface is oxidized and loosened, and then the electric energy meter burning is caused by heating.

The invention application with publication number CN108764598A discloses a low-pressure metering tank fault risk assessment method. However, the existing low-voltage metering box cannot accurately reflect the type of the fault causing the non-electricity of the user, so even if the fault of the metering box is solved by switching the standby electric energy meter, the problem can be only maintained, and a series of problems that the time from the occurrence of power failure to the recovery of power transmission of the user is long, the manpower is wasted and the like are caused.

Disclosure of Invention

Aiming at the problems that the fault type cannot be accurately distinguished and the standby electric energy meter cannot be automatically switched in the prior art, the invention carries out targeted fault judgment aiming at frequent faults of burning out of the electric energy meter so as to determine whether the power failure reason is the problem of the electric energy meter, and executes the switching step under the condition that the electric energy meter has the problems so as to avoid the waste of maintenance resources.

The technical scheme of the invention is as follows.

A fault diagnosis and maintenance method for an electric energy meter in a low-voltage metering box comprises the following steps:

initial data acquisition: in a simulation experiment, connecting a low-voltage metering box with a power grid and a simulation load, adjusting fault factors of an electric energy meter to damage the electric energy meter until the low-voltage metering box breaks down, and recording fault types, corresponding abnormal parameters and the fault factors of the electric energy meter to obtain a fault meter;

and (3) fault analysis: collecting fault parameters of a low-voltage metering box with a fault, judging whether the fault is an electric energy meter fault according to whether the matching degree reaches a threshold value or not by combining abnormal parameters of a fault meter, and if so, recording fault factors of the corresponding electric energy meter and switching a standby electric energy meter;

early warning indication: and (4) detecting the similarity between the condition factors of the low-voltage metering box without faults in the region and the fault factors of the corresponding electric energy meter, and indicating that the condition factors are higher than the threshold value.

According to the method, various common electric energy meter fault factors are adjusted in advance, so that the low-voltage metering box breaks down, a corresponding fault meter is obtained, fault types are determined according to abnormal parameters in the subsequent analysis process, the standby electric energy meter switching action is carried out according to the conditions, equipment which is possibly broken down is screened according to condition factors, and indication is carried out.

Preferably, the fault factors of the electric energy meter include: load, temperature, humidity and structural damage. The fault factors can cause the fault of the electric energy meter to a certain extent, and the adjusting process is a corresponding degree recording process. In the subsequent analysis process, the temperature and humidity can be presumed by meteorological conditions, the load can be directly obtained, and the structural damage needs to be checked in the field.

Preferably, the abnormal parameter detection range includes: and (3) carrying out weight distribution of fault parameters on each electric energy meter fault factor in the fault meter according to the change curves of the node voltage and the node current. The node voltage and the node current are common parameters, the collection of the node voltage and the node current depends on a collection object and a tool of a specific collection unit, and the collection object and the tool are unified to ensure the usability of data, so that the position of a specific detection point is not limited.

Preferably, the calculating process of the matching degree includes: and calculating the sample deviation degree of each parameter according to the fault parameters and the abnormal parameters of the fault table, and counting the total value of the sample deviation degrees after the weight is superimposed to obtain the matching degree. If a certain parameter curve in the fault parameters is A and an abnormal parameter curve in the fault table is B, carrying out integral solution on A-B in the interval to obtain the sample deviation degree, if the weight is C, multiplying the sample deviation degree by C to obtain the sample deviation degree after the weight is superposed, and carrying out multiple accumulation to obtain a total value.

Preferably, the calculating process of the similarity includes: and calculating the sample deviation degree of each condition factor according to the condition factors and the electric energy meter fault factors of the fault meter, and counting the total value of the sample deviation degrees after the weight is superimposed to obtain the matching degree. The calculation method is substantially identical to that described above, except that the current values are used directly for calculations rather than curves, where structural damage does not take into account the calculation range.

Preferably, the process of switching the standby electric energy meter includes: and cutting off the corresponding fault electric energy meter line, switching to the standby electric energy meter line, and recovering the power supply of the user.

The substantial effects of the invention include: the method comprises the steps of adjusting various common electric energy meter fault factors in advance to enable a low-pressure metering box to break down to obtain a corresponding fault meter, determining fault types according to abnormal parameters in a follow-up analysis process, carrying out standby electric energy meter switching action according to conditions, screening equipment which possibly has the same fault according to condition factors, indicating, and recovering power supply of a fault user by switching to a standby electric energy meter power supply mode aiming at the problem of frequent electric energy meter faults of a residential area, so that the power failure time of the user can be reduced to the minimum.

Detailed Description

The technical solution of the present application will be described with reference to the following examples. In addition, numerous specific details are set forth below in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.

Example (b):

a fault diagnosis and maintenance method for an electric energy meter in a low-voltage metering box comprises the following steps:

initial data acquisition: in a simulation experiment, connecting a low-voltage metering box with a power grid and a simulation load, adjusting fault factors of an electric energy meter to damage the electric energy meter until the low-voltage metering box breaks down, and recording fault types, corresponding abnormal parameters and the fault factors of the electric energy meter to obtain a fault meter;

and (3) fault analysis: collecting fault parameters of a low-voltage metering box with a fault, judging whether the fault is an electric energy meter fault according to whether the matching degree reaches a threshold value or not by combining abnormal parameters of a fault meter, and if so, recording fault factors of the corresponding electric energy meter and switching a standby electric energy meter;

early warning indication: and (4) detecting the similarity between the condition factors of the low-voltage metering box without faults in the region and the fault factors of the corresponding electric energy meter, and indicating that the condition factors are higher than the threshold value.

In the embodiment, various common electric energy meter fault factors are adjusted in advance, so that the low-voltage metering box breaks down to obtain a corresponding fault meter, fault types are determined according to abnormal parameters in the subsequent analysis process, the standby electric energy meter switching action is performed according to the conditions, and then equipment which possibly breaks down is screened according to condition factors and indicated.

The fault factors of the electric energy meter comprise: load, temperature, humidity and structural damage. The fault factors can cause the fault of the electric energy meter to a certain extent, and the adjusting process is a corresponding degree recording process. In the subsequent analysis process, the temperature and humidity can be presumed by meteorological conditions, the load can be directly obtained, and the structural damage needs to be checked in the field.

The abnormal parameter detection range includes: and (3) carrying out weight distribution of fault parameters on each electric energy meter fault factor in the fault meter according to the change curves of the node voltage and the node current. The node voltage and the node current are common parameters, the collection of the node voltage and the node current depends on a collection object and a tool of a specific collection unit, and the collection object and the tool are unified to ensure the usability of data, so that the position of a specific detection point is not limited.

The calculation process of the matching degree of the embodiment comprises the following steps: and calculating the sample deviation degree of each parameter according to the fault parameters and the abnormal parameters of the fault table, and counting the total value of the sample deviation degrees after the weight is superimposed to obtain the matching degree. If a certain parameter curve in the fault parameters is A and an abnormal parameter curve in the fault table is B, carrying out integral solution on A-B in the interval to obtain the sample deviation degree, if the weight is C, multiplying the sample deviation degree by C to obtain the sample deviation degree after the weight is superposed, and carrying out multiple accumulation to obtain a total value.

The calculation process of the similarity comprises the following steps: and calculating the sample deviation degree of each condition factor according to the condition factors and the electric energy meter fault factors of the fault meter, and counting the total value of the sample deviation degrees after the weight is superimposed to obtain the matching degree. The calculation method is substantially identical to that described above, except that the current values are used directly for calculations rather than curves, where structural damage does not take into account the calculation range.

The process of switching the standby electric energy meter comprises the following steps: and cutting off the corresponding fault electric energy meter line, switching to the standby electric energy meter line, and recovering the power supply of the user.

In addition, according to the fault type, three groups of sensors are arranged and respectively arranged at a power supply access side wiring position of the metering box, a metering meter position in the metering box and an output side wiring position of the metering box, and the three groups of sensors can correspond to three fault types of sensing external line faults and household internal line faults of the fault of the metering box.

When detecting that all three groups of sensors return no-power signals, judging that the fault is an external line fault; when no electric signals of a meter position of the internal meter and an output side sensor are detected, judging that the fault is the fault of the metering box; when only the no-power signal of the output side sensor is detected, judging that the fault is a user wiring fault; and when the non-electrical signals of other combination modes are detected, judging that the faults are other faults.

The substantial effects of the present embodiment include: the method comprises the steps of adjusting various common electric energy meter fault factors in advance to enable a low-pressure metering box to break down to obtain a corresponding fault meter, determining fault types according to abnormal parameters in a follow-up analysis process, carrying out standby electric energy meter switching action according to conditions, screening equipment which possibly has the same fault according to condition factors, indicating, and recovering power supply of a fault user by switching to a standby electric energy meter power supply mode aiming at the problem of frequent electric energy meter faults of a residential area, so that the power failure time of the user can be reduced to the minimum.

Through the description of the above embodiments, those skilled in the art will understand that, for convenience and simplicity of description, only the division of the above functional modules is used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of a specific device is divided into different functional modules to complete all or part of the above described functions.

The technical solution of the embodiments of the present application may be essentially or partially contributed to the prior art, or all or part of the technical solution may be embodied in the form of a software product, where the software product is stored in a storage medium, and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.