CN114372592A - Safety evaluation method, control device and storage medium of TN (twisted nematic) grounding system - Google Patents

Safety evaluation method, control device and storage medium of TN (twisted nematic) grounding system Download PDF

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CN114372592A
CN114372592A CN202111444827.8A CN202111444827A CN114372592A CN 114372592 A CN114372592 A CN 114372592A CN 202111444827 A CN202111444827 A CN 202111444827A CN 114372592 A CN114372592 A CN 114372592A
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probability
determining
fault
equipment
grounding system
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刘国伟
赵宇明
王静
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Shenzhen Power Supply Bureau Co Ltd
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Shenzhen Power Supply Bureau Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/20—Administration of product repair or maintenance
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0635—Risk analysis of enterprise or organisation activities
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services
    • G06Q50/26—Government or public services
    • G06Q50/265—Personal security, identity or safety

Abstract

The application relates to a security assessment method, a control device and a storage medium of a TN grounding system. The safety evaluation method of the TN grounding system comprises the following steps: determining equipment fault probability corresponding to each target equipment in a working state, wherein the target equipment is at least two of the plurality of equipment; determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment; and determining the safety risk of the TN grounding system according to the system fault probability, wherein the higher the system fault probability is, the higher the safety risk of the TN grounding system is. The safety assessment method of the TN grounding system can assess the safety risk of the TN grounding system.

Description

Safety evaluation method, control device and storage medium of TN (twisted nematic) grounding system
Technical Field
The present disclosure relates to the field of low-voltage dc power supply technologies, and in particular, to a security evaluation method, a control device, and a storage medium for a TN ground system.
Background
With the development of power electronic technology and the continuous access of new energy (such as photovoltaic and energy storage), a low-voltage direct-current power supply system appears in the field of civil power supply, and has the characteristics of safety, reliability and economy. At present, a common low-voltage direct-current power supply system in a civil 220V alternating-current system is a TN grounding system.
However, there are some safety risks of faults in the TN grounding system, and therefore, a means for evaluating the safety risks of the TN grounding system is urgently needed.
Disclosure of Invention
In view of the above, it is necessary to provide a safety evaluation method, a control device and a storage medium for a TN grounding system, which can accurately quantify the safety risk of the low-voltage direct-current TN grounding system.
A safety evaluation method of a TN (twisted nematic) grounding system is applied to the TN grounding system, the TN grounding system comprises a plurality of devices connected to the same direct current bus, and the method comprises the following steps:
determining equipment fault probability corresponding to each target equipment in a working state, wherein the target equipment is at least two of the plurality of equipment;
determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment;
and determining the safety risk of the TN grounding system according to the system fault probability, wherein the higher the system fault probability is, the higher the safety risk of the TN grounding system is.
In one embodiment, the determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment includes:
determining a first probability of failure of one target device according to the device failure probability corresponding to each target device;
and determining the system fault probability of the single point fault of the TN system according to the first probability.
In one embodiment, the TN grounding system further includes a monitoring device, and the monitoring device is configured to monitor the TN grounding system for a single point of failure, and the method further includes:
determining a second probability of the monitoring device failing;
the determining the system fault probability of the single point fault of the TN system according to the first probability includes:
and determining the system fault probability according to the first probability and the second probability.
In one embodiment, the determining the system failure probability based on the first probability and the second probability comprises:
taking the maximum value of the first probability and the second probability as the system failure probability.
In one embodiment, the determining the device failure probability corresponding to each target device in the working state includes:
acquiring target equipment information corresponding to each target equipment;
and determining the equipment fault probability corresponding to each target equipment according to the target equipment information.
In one embodiment, determining the safety risk of the TN grounding system according to the system fault probability comprises:
determining a matching probability interval matched with the system fault probability, wherein different probability intervals correspond to different safety levels;
determining the safety level of the TN grounding system according to the matching probability interval;
the method further comprises the following steps:
and initiating a safety alarm under the condition that the safety level exceeds a preset level.
In one embodiment, the method further comprises:
monitoring operational data of each device;
and determining at least two target devices in working states according to the operation data.
A safety evaluation device of a TN grounding system is applied to the TN grounding system, the TN grounding system comprises a plurality of devices connected to the same direct current bus, and the device comprises:
the device failure determining module is used for determining the device failure probability corresponding to each target device in the working state, wherein the target devices are at least two of the plurality of devices;
the system fault determining module is used for determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment;
and the safety evaluation module is used for determining the safety risk of the TN grounding system according to the system fault probability, wherein the higher the system fault probability is, the higher the safety risk of the TN grounding system is.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method described above when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
According to the safety evaluation method, the control device and the storage medium of the TN grounding system, the system fault probability of the TN grounding system is determined according to the equipment fault probability corresponding to each equipment by determining the equipment fault probability corresponding to each target equipment in the working state, the system fault probability of the TN grounding system is positively correlated with the safety risk of the TN grounding system, the higher the system fault probability is, the higher the safety risk of the TN grounding system is, and the safety risk of the low-voltage direct-current TN grounding system is accurately quantified by determining the system fault probability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a view of an application scenario of a TN grounding system;
FIG. 2 is a schematic flow chart illustrating a safety evaluation method of the TN grounding system in one embodiment;
fig. 3 is a schematic structural diagram of a safety evaluation device of the TN grounding system in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
The safety evaluation method of the TN grounding system provided by the application can be applied to the application environment as shown in FIG. 1. As shown in fig. 1, a TN grounding system includes multiple devices, for example, device 1 … …, device n, where the multiple devices are connected to the same power bus, and a PE line is led out from each device to be connected to ground. When a plurality of devices in the TN grounding system normally operate, the monitoring devices acquire operation data of the devices, the probability of single-point grounding faults of the low-voltage direct-current TN grounding system is calculated, and the safety risk of the low-voltage direct-current TN grounding system is evaluated according to the numerical value of the single-point grounding fault probability.
In an embodiment, as shown in fig. 2, fig. 2 is a schematic flowchart of a safety evaluation method of a TN grounding system provided by the embodiment. The method is applied to a TN grounding system, wherein the TN grounding system comprises a plurality of devices connected to the same direct current bus, and the method comprises the following steps of S110 to S130:
s110, determining the equipment fault probability corresponding to each target equipment in the working state, wherein the target equipment is at least two of the plurality of equipment;
the equipment refers to a plurality of electrical equipment of the same power bus in the TN grounding system. The target device refers to a device in an operating state among a plurality of devices on the same power bus. The device failure probability refers to the probability of a device failure. Optionally, the equipment failure probability is the probability of the equipment having an insulation failure, that is, the equipment having the insulation failure is regarded as the equipment having the failure. Optionally, the failure probability of the device may be determined by some working parameters of the device, or determined by experiments, or obtained according to empirical parameters, which is not limited in this embodiment. And specifically, the probability of insulation damage of each device is obtained by adopting empirical parameters.
Optionally, the device failure probabilities of different devices failing may be the same or different. Generally, if the device failure probability of a device is obtained according to empirical parameters, the device failure probabilities corresponding to different devices are the same.
In this embodiment, specifically, the safety risk of the system fault is evaluated by determining the probability of the occurrence of the ground fault of each device, and if the probability of the insulation damage of each device is determined according to the empirical parameters, the calculation amount is reduced, the calculation difficulty is reduced, and the calculation of the probability of the insulation damage of each device is avoided.
S120, determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment;
the system fault probability of the TN ground system refers to the probability of a single point fault occurring to equipment in the TN ground system. The probability of a single point of failure of a device is generally determined by empirical parameters of the device of the TN earth system.
S130, determining the safety risk of the TN grounding system according to the system fault probability, wherein the higher the system fault probability is, the higher the safety risk of the TN grounding system is.
In this step, if the system failure probability is lower, it indicates that the possibility of the failure of the TN ground system is lower, and the safety risk of the TN ground system is lower at this time; similarly, the higher the system failure probability is, the higher the possibility that the TN ground system fails is, and at this time, the higher the safety risk of the TN ground system is.
According to the technical scheme of the embodiment, the target equipment is at least two of the plurality of equipment by determining the first probability corresponding to each target equipment in the working state; determining the system fault probability of the TN grounding system according to the first probability corresponding to each target device; and determining the safety risk of the TN grounding system according to the system fault probability, wherein the lower the system fault probability is, the lower the safety risk of the TN grounding system is, and the safety risk of the TN grounding system can be evaluated.
Optionally, after the safety risk of the TN grounding system is determined, if the safety risk is higher than the preset safety risk, an alarm prompt may be sent out, so that operation and maintenance personnel can perform troubleshooting in time, the TN grounding system is prevented from performing troubleshooting after a fault occurs, and the safety of the TN grounding system is improved.
In one embodiment, the determining a system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment includes: determining a first probability of failure of one target device according to the device failure probability corresponding to each target device; and determining the system fault probability of the single-point fault of the TN grounding system according to the first probability.
Specifically, when a ground short circuit fault occurs in the low-voltage direct-current TN grounding system, the fault current indication value is large, and the over-current protection equipment can act quickly, so that the purposes of removing the fault equipment and avoiding fault spreading are achieved. Therefore, when one ground fault occurs in the low-voltage direct-current TN grounding system, the protection is considered to be an action; and because the occurrence of the ground fault of the equipment is a small-probability event, the probability that more than two pieces of equipment simultaneously have the ground fault within the time threshold of one protection action can be ignored, and the probability that the low-voltage direct-current TN ground system has a single-point ground fault can be considered as the system fault probability.
In this embodiment, the probability of the ground fault of the TN system can be accurately calculated by determining the first probability of the fault of one of the target devices according to the device fault probability corresponding to each target device, the device corresponding to each target device, and the probability of the ground fault of the TN system according to the first probability. In addition, considering that the fault condition of the TN grounding system is generally a single-point fault, the first probability of one device fault is taken as the system fault probability of the TN grounding system, and the problem of long operation time caused by calculating various conditions is avoided.
In one embodiment, the TN grounding system further comprises a monitoring device for monitoring the TN grounding system for a single point of failure, and the method further comprises:
determining a second probability of the monitoring device failing;
the determining the system fault probability of the single point fault of the TN system according to the first probability includes:
and determining the system fault probability according to the first probability and the second probability.
Wherein the second probability refers to a probability of failure of the monitoring device. When the monitoring equipment has a single-point ground fault, namely a low-voltage direct-current TN grounding system has a ground short circuit fault, the fault current indication value is large, and the over-current protection equipment can act quickly, so that the aims of cutting off the fault equipment and avoiding fault spreading are fulfilled. Specifically, in the TN grounding system, the fault point position can be determined and the fault can be eliminated by an alarm of the insulation detection device (i.e., the monitoring device). However, there is an insulation detection device failure, and at this time, if a single fault occurs, the monitoring device fails to alarm in time, and at this time, when a single-point ground fault occurs in the TN ground system, the single-point fault of the TN ground system cannot be found through the monitoring device, so the second probability may also be understood as a probability that the single-point fault occurs in the TN ground system cannot be detected through the monitoring device.
In this embodiment, the electrical safety of the target device may be reflected by the first probability, and the stability of the monitoring device may be reflected by the second probability. If the monitoring equipment is not considered, the probability of single-point fault can be determined according to the first probability corresponding to each target equipment, namely the system fault probability of the TN grounding system is determined; if the monitoring equipment is considered, the TN ground system can find and remove a single-point fault through the monitoring equipment under the condition that the monitoring equipment can normally operate, the probability of the fault of the monitoring equipment is the probability of the single-point fault of the TN ground system, and the second probability can be used as the system fault probability.
It is understood that the system failure probability of the TN earth system can be identified by the first probability alone and by the second probability alone. In order to improve the safety of the TN grounding system, the maximum value of the first probability and the second probability is used as the system fault probability, so that the accuracy of safety evaluation of the TN grounding system can be improved, and the safety of the TN grounding system is improved.
In this embodiment, it can be understood that, in the TN ground system, the system fault probability of the TN ground system is determined by determining the first probability corresponding to the target device under the same dc power bus and the second probability of the IMD failure when the target device has a single-point ground fault, and the safety risk of the TN ground system is evaluated according to the system fault probability, so as to quantify the occurrence probability of the single-point ground fault and precisely quantify the safety risk of the TN ground system.
In one embodiment, said determining said system failure probability based on said first probability and said second probability comprises: taking the maximum value of the first probability and the second probability as the system failure probability.
The first probability is a probability of a single-point ground fault occurring in a plurality of target devices in the TN ground system, and the second probability is a probability of a fault occurring in a monitoring device in the TN ground system, that is, a probability of failing to detect the single-point fault. The maximum value of the first probability and the second probability is determined to be used as the system fault probability, so that the fault probability of the TN grounding system is more accurate, and the safety risk quantitative evaluation of the system is more accurate.
Specifically, in the TN grounding system, a power supply neutral point in the TN grounding system is grounded, an equipment shell is connected with a neutral line, when a grounding short-circuit fault occurs in the low-voltage direct-current TN grounding system, a fault current indication value is large, and overcurrent protection equipment can act quickly, so that the purposes of removing the fault equipment and avoiding fault spreading are achieved. Therefore, when one ground fault occurs in the low-voltage direct-current TN grounding system, the protection is considered to be an action; and because the occurrence of the ground fault of the equipment is a small-probability event, the probability that more than two pieces of equipment simultaneously have the ground fault within the time threshold of one protection action can be ignored, and the probability that the low-voltage direct-current TN grounding system has a single-point ground fault can be only considered.
For example, assuming that the first probabilities of different target devices are the same, the system failure probability is calculated by the following formula without considering the monitoring devices:
Figure BDA0003383777410000091
in the formula, n is the number of devices which are in work under the same direct-current power supply bus, namely the number of target devices; py is the equipment failure probability of insulation breakage of each target equipment; py, s is the first failure probability, i.e. the system failure probability of the TN earthed system without taking into account the monitoring equipment.
In the TN grounding system, a calculation formula of the probability p1 of insulation breakage of n devices under the same dc bus and the probability Py, s of single-point ground fault occurrence when a certain device fails is substituted to determine the single-point ground fault.
In one embodiment, the determining the device failure probability corresponding to each target device in the working state includes: acquiring target equipment information corresponding to each target equipment; and determining the equipment fault probability corresponding to each target equipment according to the target equipment information.
The target equipment information is information influencing the insulation damage of the equipment, specifically, information such as equipment type, equipment service time, equipment service environment and equipment service conditions, and the probability of each equipment in the system failing is determined according to the target information.
Specifically, the corresponding relationship between the device information and the failure probability is predetermined, and the failure probability corresponding to the target device can be determined according to the target device information by acquiring the target device information corresponding to the target device.
In this embodiment, the probability of failure of each device in the system is determined through the target device information, which is equivalent to considering the working conditions of different devices, so that the obtained failure probability is more accurate, and the determined system failure probability is more accurate, thereby accurately reflecting the safety of the system.
In one embodiment, determining the safety risk of the TN grounding system according to the system fault probability comprises: determining a matching probability interval matched with the system fault probability, wherein different probability intervals correspond to different safety levels; determining the safety level of the TN grounding system according to the matching probability interval; the method further comprises the following steps: and initiating a safety alarm under the condition that the safety level exceeds a preset level.
The matching probability intervals are set according to actual conditions, and the number of the matching probability intervals is also set according to specific actual conditions; the preset grade is set according to the actual operation environment of the TN grounding system.
In this embodiment, by matching the system fault probability with the matching probability interval and corresponding the matching probability interval to the safety class, when the safety class exceeds the preset class, a safety alarm is initiated, so that the TN grounding system can operate more safely and stably, a single-point grounding fault can be found in time, and the faulty equipment can be eliminated.
It should be noted that the determining manner of the second probability may refer to the determining manner of the device failure probability, and only the target device is replaced by the monitoring device, which is not described in detail in this embodiment.
In one embodiment, the method further comprises: monitoring operational data of each device; and determining at least two target devices in working states according to the operation data.
The operation data refers to data of the equipment in the operation process. The embodiment determines which devices are in the working state through the operation data, so as to determine the target devices in the working state. Optionally, the operation data includes, but is not limited to, a voltage parameter, a current parameter, and the like, and the embodiment is not limited.
When the TN grounding system works normally and a single-point grounding short-circuit fault occurs in the TN grounding system, the operation data of each device is detected, and therefore the target device is determined.
In this embodiment, the target device is determined by monitoring the operation data of each device, and then the safety risk of the single-point ground fault existing in the TN ground system is evaluated according to the device fault probability of the target device.
It should be understood that, although the steps in the flowchart of fig. 2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 2 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 3, there is provided a safety evaluation device of a TN grounding system, including: an equipment failure determination module 210, a system failure determination module 220, and a security assessment module 230, wherein: an equipment failure determining module 210, configured to determine an equipment failure probability corresponding to each target equipment in a working state, where the target equipment is at least two of multiple pieces of equipment; a system fault determining module 220, configured to determine a system fault probability of the TN ground system according to the equipment fault probability corresponding to each equipment; and a safety evaluation module 230, configured to determine a safety risk of the TN grounding system according to the system fault probability, where the higher the system fault probability is, the higher the safety risk of the TN grounding system is.
In one embodiment, the system fault determination module 220 includes: the system comprises a first probability determination unit and a first system fault probability determination unit, wherein the first probability determination unit is used for determining a first probability of one target device being in fault according to the device fault probability corresponding to each target device; and the first system fault probability determination unit is used for determining the system fault probability of the single point fault of the TN system according to the first probability.
In one embodiment, the system fault determination module 220 further comprises: the monitoring device comprises a second probability determination unit and a second system failure probability determination unit, wherein the second probability determination unit is used for determining a second probability of failure of the monitoring device; the second system fault probability determination unit is used for determining the system fault probability of single point fault of the TN system according to the first probability, and comprises the following steps: and determining the system fault probability according to the first probability and the second probability.
In one embodiment, the second system failure probability determination unit includes: a system failure probability determining subunit, configured to use a maximum value of the first probability and the second probability as the system failure probability.
In one embodiment, the device failure determination module 210 includes: the device comprises an information acquisition unit and a device failure probability acquisition unit, wherein the information acquisition unit is used for acquiring target device information corresponding to each target device; and the equipment fault probability obtaining unit is used for determining the equipment fault probability corresponding to each target equipment according to the target equipment information.
In one embodiment, security assessment module 230 includes: the system comprises a probability interval matching module, a safety level determining module and a safety alarm module, wherein the probability interval matching module is used for determining a matching probability interval matched with the system fault probability, and different probability intervals correspond to different safety levels; the safety level determining module is used for determining the safety level of the TN grounding system according to the matching probability interval; and the safety alarm module is used for initiating safety alarm under the condition that the safety level exceeds a preset level.
In one embodiment, the safety evaluation device of the TN grounding system further comprises a data acquisition module and a target device determination module, wherein the data acquisition module is used for monitoring the operation data of each device; and the target equipment determining module is used for determining at least two target equipment in a working state according to the running data.
The specific definition of the safety evaluation device of the TN grounding system may refer to the above definition of the safety evaluation method of the TN grounding system, and is not described herein again. The modules in the safety evaluation device of the TN grounding system can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A safety evaluation method of a TN grounding system is applied to the TN grounding system, the TN grounding system comprises a plurality of devices connected to the same direct current bus, and the method comprises the following steps:
determining equipment fault probability corresponding to each target equipment in a working state, wherein the target equipment is at least two of the plurality of equipment;
determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment;
and determining the safety risk of the TN grounding system according to the system fault probability, wherein the higher the system fault probability is, the higher the safety risk of the TN grounding system is.
2. The method according to claim 1, wherein the determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment comprises:
determining a first probability of failure of one target device according to the device failure probability corresponding to each target device;
and determining the system fault probability of the single point fault of the TN system according to the first probability.
3. The method of claim 2, wherein the TN grounding system further comprises a monitoring device configured to monitor the TN grounding system for a single point of failure, the method further comprising:
determining a second probability of the monitoring device failing;
the determining the system fault probability of the single point fault of the TN system according to the first probability includes:
and determining the system fault probability according to the first probability and the second probability.
4. The method of claim 3, wherein determining the system failure probability based on the first probability and the second probability comprises:
taking the maximum value of the first probability and the second probability as the system failure probability.
5. The method of claim 1, wherein determining the device failure probability corresponding to each target device in the working state comprises:
acquiring target equipment information corresponding to each target equipment;
and determining the equipment fault probability corresponding to each target equipment according to the target equipment information.
6. The method of claim 1, wherein determining the safety risk of the TN grounding system according to the system failure probability comprises:
determining a matching probability interval matched with the system fault probability, wherein different probability intervals correspond to different safety levels;
determining the safety level of the TN grounding system according to the matching probability interval;
the method further comprises the following steps:
and initiating a safety alarm under the condition that the safety level exceeds a preset level.
7. The method of claim 1, further comprising:
monitoring operational data of each device;
and determining at least two target devices in working states according to the operation data.
8. A safety evaluation device of a TN grounding system is characterized by being applied to the TN grounding system, the TN grounding system comprises a plurality of devices connected to the same direct current bus, and the device comprises:
the device failure determining module is used for determining the device failure probability corresponding to each target device in the working state, wherein the target devices are at least two of the plurality of devices;
the system fault determining module is used for determining the system fault probability of the TN grounding system according to the equipment fault probability corresponding to each equipment;
and the safety evaluation module is used for determining the safety risk of the TN grounding system according to the system fault probability, wherein the higher the system fault probability is, the higher the safety risk of the TN grounding system is.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
CN202111444827.8A 2021-11-30 2021-11-30 Safety evaluation method, control device and storage medium of TN (twisted nematic) grounding system Pending CN114372592A (en)

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CN202111444827.8A CN114372592A (en) 2021-11-30 2021-11-30 Safety evaluation method, control device and storage medium of TN (twisted nematic) grounding system

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Application Number Priority Date Filing Date Title
CN202111444827.8A CN114372592A (en) 2021-11-30 2021-11-30 Safety evaluation method, control device and storage medium of TN (twisted nematic) grounding system

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CN114372592A true CN114372592A (en) 2022-04-19

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