A method and system for detecting abnormality of a load switch of a low-voltage meter box

Abstract

The application provides a method and system for detecting abnormality of a load switch of a low-voltage meter box, comprising: obtaining target parameter information of a target low-voltage meter box, and screening meter information in the target parameter information; determining the number of meters in the screened target parameter information, and if the number of meters in the screened target parameter information is greater than a preset first quantity threshold, then performing phase-by-phase investigation on phase lines of the meters according to a preset investigation standard to obtain corresponding investigation results; determining whether the meters have abnormality in the load switch according to the investigation results, and if so, outputting corresponding alarm signals. The application can timely find low-voltage load switches with poor contact, avoid loss of state-owned assets caused by electricity loss, avoid electrical fire accidents, save manpower and material resources, reduce economic losses of the power department, and avoid the occurrence of electrical fire safety accidents.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a method and system for detecting abnormality of load switch of low-voltage meter box. BACKGROUND

[0002] In modern power systems, the low-voltage three-phase load switch installed at the front end of the meter box is a key component for power transmission and distribution, and its stability and reliability are crucial to the safe operation of the entire power grid. However, during long-term operation, due to installation process or environmental corrosion, the low-voltage three-phase switch may have poor contact problems, which not only leads to power loss, but also may cause electrical fires and other safety accidents. Therefore, timely and accurate detection of poor contact of low-voltage load switch is urgent and very important for the power department.

[0003] Currently, there are two main methods to lock this abnormality. One is to check whether the contact of the load switch at the front end of the meter box has abnormality such as sparking and blackening through on-site inspection. This method is time-consuming and labor-intensive, and it is difficult to find abnormalities in time. At the same time, the abnormality has already caused a fire or has obvious fire hazards. The other method is big data analysis, that is, whether the meter in the meter box connected to the low-voltage load switch has the data feature of low voltage of a phase. However, in addition to poor contact of low-voltage load switch, poor contact of metering device, long power supply radius, and fault of voltage components of the meter may also show low voltage. At the same time, due to the restriction of narrowband and narrow wave transmission capacity and server storage capacity, a considerable part of the meter cannot obtain current and voltage, and cannot lock this abnormality through the voltage of the meter in the meter box. SUMMARY

[0004] The purpose of the present application is to provide a method and system for detecting abnormality of load switch of low-voltage meter box, which solves the technical problem of how to identify poor contact of load switch based on voltage.

[0005] In one aspect, a method for detecting abnormality of load switch of low-voltage meter box is provided, comprising:

[0006] Obtaining target parameter information of a target low-voltage meter box, and screening meter information in the target parameter information;

[0007] Determining the number of meters in the screened target parameter information, and if the number of meters in the screened target parameter information is greater than a preset first number threshold, performing phase-by-phase investigation on phase lines of the meters according to a preset investigation standard to obtain corresponding investigation results;

[0008] According to the result of the investigation, it is determined whether the load switch corresponding to the meter is abnormal, and if so, an alarm signal corresponding to the load switch is output.

[0009] Preferably, the target parameter information at least includes meter box number, CT corresponding to each meter in the meter box, multiplication factor, meter office code, metering point number, current and voltage of the meter, user name and power consumption address.

[0010] Preferably, the screening of the meter information in the target parameter information includes eliminating the meter whose number of extracted data points does not exceed the preset point threshold, and eliminating the meter whose voltage exceeds the preset upper limit value of voltage.

[0011] Preferably, the step of investigating the phase line of the meter according to the preset checking standard includes determining whether the A-phase voltage of the meter is always within the preset voltage range according to the target parameter information, and if so, determining that the A-phase of the load switch has poor contact.

[0012] Preferably, it further includes determining whether the A-phase, B-phase and C-phase of the load switch have low voltage according to the target parameter information, and if not, determining that the load switch has poor contact, and if so, ending the investigation.

[0013] Preferably, it further includes determining whether the B-phase voltage of the meter is always within the preset voltage range if the A-phase voltage of the meter is not always within the preset voltage range, and if so, determining that the B-phase of the load switch has poor contact.

[0014] Preferably, it further includes determining whether the A-phase, B-phase and C-phase of the load switch have low voltage according to the target parameter information, and if not, determining that the load switch has poor contact, and if so, ending the investigation.

[0015] Preferably, it further includes determining whether the C-phase voltage of the meter is always within the preset voltage range if the B-phase voltage of the meter is not always within the preset voltage range, and if so, determining that the C-phase of the load switch has poor contact.

[0016] Preferably, it further includes determining whether the A-phase, B-phase and C-phase of the load switch have low voltage according to the target parameter information, and if not, determining that the load switch has poor contact, and if so, ending the investigation.

[0017] On the other hand, a system for detecting abnormal load switch of low-voltage meter box is also provided to realize the method for detecting abnormal load switch of low-voltage meter box, which includes,

[0018] The data acquisition module is configured to acquire target parameter information of a target low-voltage meter box and to filter meter information in the target parameter information.

[0019] The data processing module is configured to determine the number of meters in the filtered target parameter information and, if the number of meters in the filtered target parameter information is greater than a preset first quantity threshold, to perform phase-by-phase checking on phase lines of the meters according to a preset checking standard to obtain corresponding checking results.

[0020] The data processing module is further configured to determine whether the meters correspond to abnormal load switches according to the checking results, and to output corresponding alarm signals if the meters correspond to abnormal load switches.

[0021] In summary, the embodiments of the present application have the following beneficial effects:

[0022] The method and system for detecting abnormal load switches of a low-voltage meter box provided by the present application take into account factors such as the inability of meters to obtain current and voltage data and the disorder of voltage data, and also take into account various situations that exhibit low voltage. In addition, the method and system perform multi-angle and multi-dimensional identification and differentiation from the perspective of the meter box, from the perspective of the uniformity of low phase voltage of all meters in the meter box, and from the perspective of the uniformity of all meters in three phases. The method and system can timely detect low-voltage load switches with poor contact, avoid the loss of state-owned assets caused by electricity loss, and also avoid electrical fire accidents. The method and system can realize timely detection of low-voltage load switches with poor contact from millions of sets of metering devices, and can realize real-time online monitoring of low voltage when applied to a system. The method and system can save manpower and resources, reduce economic losses of the power department, and avoid electrical fire safety accidents. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0024] Figure 1 FIG. 1 is a main flowchart of a method for detecting abnormal load switches of a low-voltage meter box according to an embodiment of the present application.

[0025] Figure 2 FIG. 2 is a logic diagram of a method for detecting abnormal load switches of a low-voltage meter box according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions, and advantages of the present application clearer, the following will further describe the present application in detail with reference to the drawings.

[0027] As Figure 1 and Figure 2 shown, a schematic diagram of one embodiment of a method for detecting abnormality of a load switch of a low-voltage meter box provided by the present application. In this embodiment, the method comprises the following steps:

[0028] Step S1, obtaining target parameter information of a target low-voltage meter box, and screening meter information in the target parameter information; it can be understood that the target parameter information at least includes meter box number, CT corresponding to each meter in the meter box, rate, meter local code, metering point number, current and voltage of the meter, user name and power consumption address. Extract the current and voltage of all meters in the same meter box in the past 7 days in units of meter box.

[0029] In one embodiment, the screening of the meter information in the target parameter information includes eliminating meters with the number of extracted data points not exceeding a preset point threshold, and eliminating meters with voltage exceeding a preset upper voltage limit. In this embodiment, meters with the number of extracted data points not exceeding 7 are eliminated; meters with voltage exceeding 400V are eliminated.

[0030] Step S2, determining the number of meters in the screened target parameter information, if the number of meters in the screened target parameter information is greater than a preset first number threshold, then performing phase-by-phase investigation on the phase lines of the meters according to a preset investigation standard to obtain corresponding investigation results; it can be understood that it is determined whether the number of meters under the meter box is greater than 12; if yes, then phase-by-phase investigation is performed (A phase, B phase, C phase), if not, then the process is ended.

[0031] In one embodiment, the phase-by-phase investigation of the phase lines of the meters according to the preset investigation standard includes determining whether the A-phase voltage of the meter is always within a preset voltage range according to the target parameter information, if the A-phase voltage of the meter is always within the preset voltage range, then it is determined that the A-phase of the load switch has poor contact. It also includes determining whether the voltages of the A-phase, B-phase and C-phase of the load switch are all low according to the target parameter information, if not, then it is determined that the load switch has poor contact, if yes, then the investigation is ended. It can be understood that it is determined whether the A-phase voltage of the meter is always within 185-200V, if yes, then the A-phase of the low-voltage load switch has poor contact, further determining whether the voltages of the A-phase, B-phase and C-phase are all low, if not, then the low-voltage load switch has poor contact, if yes, then the process is ended.

[0032] In one embodiment, if the A-phase voltage of the meter is not always within the preset voltage range, it is determined whether the B-phase voltage of the meter is always within the preset voltage range; if the B-phase voltage of the meter is always within the preset voltage range, it is determined that the B-phase of the load switch has poor contact. Further, it is determined according to the target parameter information whether the voltages of the A-phase, B-phase and C-phase of the load switch are all low; if not, it is determined that the load switch has poor contact; if yes, the troubleshooting is ended. Understandably, if it is determined that the A-phase voltage of the meter is not always within 185-200V, it is determined whether the B-phase voltage of the meter is always within 185-200V; if yes, the B-phase of the low-voltage load switch has poor contact; further, it is determined whether the voltages of the A-phase, B-phase and C-phase are all low; if not, the low-voltage load switch has poor contact; if yes, the troubleshooting is ended.

[0033] In one embodiment, if the B-phase voltage of the meter is not always within the preset voltage range, it is determined whether the C-phase voltage of the meter is always within the preset voltage range; if the C-phase voltage is always within the preset voltage range, it is determined that the C-phase of the load switch has poor contact. Further, it is determined according to the target parameter information whether the voltages of the A-phase, B-phase and C-phase of the load switch are all low; if not, it is determined that the load switch has poor contact; if yes, the troubleshooting is ended. Understandably, if it is determined that the B-phase voltage of the meter is not always within 185-200V, it is determined whether the C-phase voltage of the meter is always within 185-200V; if yes, the C-phase of the low-voltage load switch has poor contact; further, it is determined whether the voltages of the A-phase, B-phase and C-phase are all low; if not, the low-voltage load switch has poor contact; if yes, the troubleshooting is ended.

[0034] In step S3, it is determined according to the troubleshooting result whether the load switch corresponding to the meter is abnormal; if yes, a corresponding alarm signal is output. Understandably, the recognition and distinction are performed from multiple angles and multiple dimensions, such as from the perspective of the meter box, from the uniformity of the phase voltage of all the meters in the meter box, and from the uniformity of all the meters in three phases. Starting from the voltage of the meter in the meter box connected with the low-voltage load switch circuit, when the poor contact of a phase of the low-voltage three-phase load switch occurs, all the meters in the meter box connected with the circuit of the phase have the data characteristic of low voltage, so the poor contact of the low-voltage load switch is locked.

[0035] In the embodiment of the application, a system for detecting abnormal load switch of a low-voltage meter box is also provided to implement the method for detecting abnormal load switch of a low-voltage meter box, which comprises,

[0036] A data acquisition module is configured to acquire target parameter information of a target low-voltage meter box, and to screen meter information in the target parameter information.

[0037] The data processing module is configured to determine the number of meters in the screened target parameter information, and if the number of meters in the screened target parameter information is greater than a preset first quantity threshold, then the phase lines of the meters are sequentially checked according to a preset checking standard, and a corresponding checking result is obtained.

[0038] The system is also configured to determine whether the load switch corresponding to the meter is abnormal according to the checking result, and if the load switch is abnormal, output a corresponding alarm signal.

[0039] It should be noted that the system described in the above embodiments corresponds to the method described in the above embodiments, and therefore, the parts of the system not described in detail can be obtained by referring to the content of the method, which will not be described here.

[0040] In summary, the embodiments of the present application have the following beneficial effects:

[0041] The method and system for detecting abnormal load switches of low-voltage meter boxes provided by the present application take into account factors such as the inability of meters to obtain current and voltage data and the disorder of voltage data, and also take into account various situations that exhibit low voltage. In addition, the method and system adopt multi-angle and multi-dimensional identification and differentiation from the perspective of meter boxes, from the uniformity of phase voltage of all meters in the meter box, and from the uniformity of all meters. The method and system can timely detect low-voltage load switches with poor contact, avoid the loss of state-owned assets caused by electricity loss, and also avoid electrical fire accidents. The method and system can realize timely detection of low-voltage load switches with poor contact from millions of sets of metering devices, and can realize real-time online monitoring of low voltage when applied to a system. The method and system can save manpower and resources, reduce economic losses of the power department, and avoid the occurrence of electrical fire safety accidents.

[0042] The above only describes the preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application, so equivalent changes made according to the claims of the present application are still within the scope of the present application.

Claims

1. A method of detecting abnormality of a load switch of a low-voltage meter box, characterized by, The method comprises the following steps: acquiring target parameter information of a target low-voltage meter box, and screening meter information in the target parameter information; determining the number of meters in the screened target parameter information, and if the number of meters in the screened target parameter information is greater than a preset first number threshold, performing phase-by-phase investigation on phase lines of the meters according to a preset investigation standard to obtain corresponding investigation results; determining whether the corresponding load switch of the meter is abnormal according to the investigation results, and if the corresponding load switch of the meter is abnormal, outputting a corresponding alarm signal; the screening of the meter information in the target parameter information comprises eliminating a meter whose number of extracted data points is not more than a preset number threshold, and eliminating a meter whose voltage exceeds a preset upper voltage limit; the phase-by-phase investigation on the phase lines of the meters according to the preset investigation standard comprises determining whether the A-phase voltage of the meter is always within a preset voltage range according to the target parameter information, if the A-phase voltage of the meter is always within the preset voltage range, determining that the A-phase of the load switch has poor contact, if the A-phase voltage of the meter is not always within the preset voltage range, determining whether the B-phase voltage of the meter is always within the preset voltage range, if the B-phase voltage of the meter is always within the preset voltage range, determining that the B-phase of the load switch has poor contact, if the B-phase voltage of the meter is not always within the preset voltage range, determining whether the C-phase voltage of the meter is always within the preset voltage range, and if the C-phase voltage is always within the preset voltage range, determining that the C-phase of the load switch has poor contact; the method further comprises determining whether the A-phase, B-phase and C-phase of the load switch have low voltage according to the target parameter information, if not, determining that the load switch has poor contact, and if yes, ending the investigation.

2. The method of claim 1, wherein, The target parameter information at least comprises a meter box number, a CT corresponding to each meter in the meter box, a meter local code, a metering point number, a current and a voltage of the meter, a user name and a power consumption address.

3. A system for detecting abnormality of a load switch of a low-voltage meter box for implementing the method according to any one of claims 1-2, characterized in that, The method comprises the following steps: a data acquisition module is configured to acquire target parameter information of a target low-voltage meter box, and screen meter information in the target parameter information; a data processing module is configured to determine the number of meters in the screened target parameter information, and if the number of meters in the screened target parameter information is greater than a preset first number threshold, perform phase-by-phase investigation on phase lines of the meters according to a preset investigation standard to obtain corresponding investigation results; the data processing module is further configured to determine whether the corresponding load switch of the meter is abnormal according to the investigation results, and if the corresponding load switch of the meter is abnormal, output a corresponding alarm signal.

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