CN111913126A - Insulation pad arcing fault detection method - Google Patents

Insulation pad arcing fault detection method Download PDF

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Publication number
CN111913126A
CN111913126A CN202010488800.8A CN202010488800A CN111913126A CN 111913126 A CN111913126 A CN 111913126A CN 202010488800 A CN202010488800 A CN 202010488800A CN 111913126 A CN111913126 A CN 111913126A
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Prior art keywords
resistance
point
shell
electrical equipment
grounding
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Granted
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CN202010488800.8A
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Chinese (zh)
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CN111913126B (en
Inventor
刘朝晖
李岳松
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Shenhua Baoshen Railway Group Co Ltd
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Shenhua Baoshen Railway Group Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/56—Testing of electric apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The application relates to an insulation pad arcing fault detection method, which comprises the following steps: determining a detection point, wherein the detection point is a position on the shell of the electrical equipment, which is normally electrically connected with the grounding body of the electrical equipment; measuring the grounding resistance of the detection point; determining the grounding resistance of the electrical equipment shell according to the grounding resistance of the detection point; and if the grounding resistance of the electric service equipment shell is smaller than a preset first resistance threshold value, determining that the electric service equipment is a fault point. The method comprises the steps of determining the position of a shell of the electrical equipment, which is normally electrically connected with a grounding body of the electrical equipment, as a detection point, measuring the grounding resistance of the detection point, determining the grounding resistance of the shell of the electrical equipment according to the grounding resistance of the detection point, and judging whether the electrical equipment is a fault point according to the grounding resistance of the shell of the electrical equipment and a preset first resistance threshold value, so that the fault point causing the arcing fault of the insulating pad is determined, and the problem of the arcing fault of the insulating pad is fundamentally solved.

Description

Insulation pad arcing fault detection method
Technical Field
The application relates to the technical field of rail transit, in particular to an insulation pad arcing fault detection method.
Background
In the electrified rail transit, a traction power supply system needs to return through a rail, a large number of electric service equipment are arranged on the periphery of the rail, and in order to ensure the insulation of the rail to the ground, the grounding part of the electric service equipment is electrically isolated from the rail connecting part through an insulating pad.
Along with the increase of the operation age, the insulating pad can be influenced by factors such as dust, precipitation and the like except the aging problem, so that the insulating property is reduced, even the arcing fault of the insulating pad can occur, the insulating pad is burnt, even the connected metal parts are burnt and melted in serious conditions, and the rail driving safety is influenced. At present, the reason of arcing faults of the insulating pad is not determined, so that the fundamental problem of faults cannot be solved, and the insulating pad can only be replaced after the insulating pad is damaged.
Disclosure of Invention
In view of the above, it is necessary to provide an insulation pad arcing fault detection method capable of locating a fault point.
An insulation pad arcing fault detection method, comprising:
determining a detection point, wherein the detection point is a position on the shell of the electrical equipment, which is normally electrically connected with the grounding body of the electrical equipment;
measuring the grounding resistance of the detection point;
determining the grounding resistance of the electrical equipment shell according to the grounding resistance of the detection point;
and if the grounding resistance of the electric service equipment shell is smaller than a preset first resistance threshold value, determining that the electric service equipment is a fault point.
In one embodiment, the insulation pad arcing fault detection method further comprises:
and if the grounding resistance of the electric service equipment shell is larger than the first resistance threshold value and smaller than a preset second resistance threshold value, determining that the electric service equipment is a hidden danger point.
In one embodiment, the step of determining the detection point comprises:
detecting whether an open circuit occurs between the test point and the grounding body of the electrical equipment; the test point is any one point on the shell of the electrical service equipment;
if not, determining the test point as a detection point.
In one embodiment, the number of the determination detection points is three or more.
In one embodiment, the step of determining the ground resistance of the electrical equipment enclosure from the ground resistance of the detection point comprises:
calculating an average value according to the grounding resistance of each detection point;
determining the average value as the grounding resistance of the electrical equipment housing.
In one embodiment, the insulation pad arcing fault detection method further comprises:
short-circuiting the electric service equipment shell with other electric service equipment shells; and the other electric service equipment is equipment which is connected with the electric service equipment through the same connecting wire.
In one embodiment, the ground resistance of the test point is measured using a tripolar method.
In one embodiment, the first resistance threshold is 20 Ω.
In one embodiment, the second resistance threshold is 100 Ω.
In one embodiment, the insulation pad arcing fault detection method further comprises:
and detecting the hidden danger points according to a preset period.
The method for detecting the arcing fault of the insulating pad comprises the steps of determining a position on a shell of the electrical equipment, which is normally electrically connected with a grounding body of the electrical equipment, as a detection point, measuring the grounding resistance of the detection point, determining the grounding resistance of the shell of the electrical equipment according to the grounding resistance of the detection point, and judging whether the electrical equipment is a fault point or not according to the grounding resistance of the shell of the electrical equipment and a preset first resistance threshold value, so that the fault point causing the arcing fault of the insulating pad is determined, and the problem of the arcing fault of the insulating pad is fundamentally solved.
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 schematic flow chart of a method for detecting arcing faults of an insulation pad in one embodiment;
FIG. 2 is a schematic flow chart of a method for detecting arcing faults of an insulation pad in one embodiment;
FIG. 3 is a flow chart illustrating the step of determining a detection point in one embodiment;
FIG. 4 is a schematic flowchart of the step of determining the ground resistance of the enclosure of the electrical equipment according to the ground resistance of the detection point in one embodiment;
FIG. 5 is a schematic flow chart of a method for detecting arcing faults of an insulation pad in one embodiment;
FIG. 6 is a schematic flow chart of a method for detecting an arcing fault of an insulation pad in one embodiment;
FIG. 7 is a diagram of the internal structure of a computer device 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.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
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. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As described in the background art, in order to protect smooth operation of a train organization and safe operation of a train, a large number of electric appliances such as a choke adapter transformer used for a signal device, a switch machine for a switch control, etc. are installed on a track, and a large number of cable junction boxes for connecting a power supply cable and a signal cable to each electric appliance are required. In order to avoid short circuit of two steel rails of a track and simultaneously avoid short circuit of the steel rails and the ground, a large number of insulating pads are used on the track to realize electrical isolation, for example, a traction coil lead of a choke adapter transformer needs to be isolated from a shell through a tubular insulating pad, and an insulating pad is needed on a transmission rod of a transferring machine to isolate the steel rails from the shell of the transferring machine. In the running process of a railway, an arcing fault can occur when a train passes through an insulating pad, the insulating pad is carbonized due to long-time combustion of electric arcs, and the mechanical strength and the insulating property are reduced. When the stress is severe, the metal parts on the two sides of the insulating pad are melted and deformed. Therefore, when the insulating pad is arcing for a long time, the travelling crane at the position needs to be interrupted, and the insulating pad and the damaged metal piece are replaced, so that the influence on the normal travelling crane is caused.
The inventor researches and finds that the problem is caused because the armouring and shielding layer of the cable of the electric service equipment is connected with the ground net at the signal floor side by adopting a single-end grounding method, and the armouring and shielding layer of the cable is not connected with the equipment shell at the outdoor equipment side, so that the outdoor electric service equipment shell is not connected with the signal floor ground net under the normal condition, and after the insulating pad is broken down, because the grounding resistance of the electric service equipment shell is higher, the current passing through the insulating pad is smaller, and continuous electric arcs cannot be generated. However, when the armor or shielding layer of the cable is in contact with the electric service equipment shell, because the grounding resistance of the signal ground grid is low, the traction current flows to the electric service equipment shell through the insulating pad, and then the resistance of the return current through the ground is low, the return current is too high, the generated electric arc cannot be extinguished, and the continuous arc burning of the insulating pad is caused. When the armor and the shielding layer of the cable are not in contact with the electrical equipment shell, the electrical equipment shell can be grounded only through the grounding body buried underground by the electrical equipment shell, and the grounding resistance is high; when the armor and/or shielding layer of the cable is in contact with the electrical equipment shell, the grounding resistance of the electrical equipment shell can be lowered due to the lower grounding resistance of the signal ground net.
Based on the reasons, the invention provides a scheme capable of positioning the fault point causing the arcing problem of the insulating pad, which determines whether the electrical equipment shell is in collision connection with the armor and/or the shielding layer of the cable by detecting the grounding resistance of the electrical equipment shell so as to determine whether the electrical equipment shell is the fault point.
In one embodiment, as shown in fig. 1, there is provided an insulation pad arcing fault detection method, including:
and S100, determining a detection point, wherein the detection point is a position on the shell of the electrical equipment, which is normally electrically connected with the grounding body of the electrical equipment.
In order to detect the grounding resistance of the electrical equipment shell, a detection point which can be used for detection on the electrical equipment shell needs to be determined, and because the electrical equipment shell is grounded through the electrical equipment grounding body under a normal condition, the detection point for detecting the grounding resistance of the electrical equipment shell needs to be ensured to be an area which is normally and electrically connected with the electrical equipment grounding body. One or more detection points may be determined as desired.
And step S200, measuring the grounding resistance of the detection point.
And carrying out grounding resistance detection on the detection points. The ground resistance is a resistance encountered by a current flowing from a ground device into the ground and then flowing through the ground to another ground body or spreading to a distant place.
And step S300, determining the grounding resistance of the electrical equipment shell according to the grounding resistance of the detection point.
If the number of the detection points is one, determining the grounding resistance of the detection points as the grounding resistance of the shell of the electrical equipment; and if more than one detection point is adopted, determining the average value of the grounding resistance of each detection point as the grounding resistance of the electrical equipment shell.
Step S400, if the grounding resistance of the electric service equipment shell is smaller than a preset first resistance threshold value, the electric service equipment is determined to be a fault point.
The first resistance threshold is the grounding resistance when the electrical equipment shell and the cable armor or shielding layer are in contact fault. Through the comparison of the preset first resistance threshold value and the grounding resistance of the electrical service equipment shell, when the grounding resistance of the electrical service equipment shell is lower than the first resistance threshold value, the electrical service equipment shell can be determined to be in contact with the armor or shielding layer of the cable, namely the electrical service equipment is a fault point.
The method for detecting the arcing fault of the insulating pad comprises the steps of determining a position on a shell of the electrical equipment, which is normally electrically connected with a grounding body of the electrical equipment, as a detection point, measuring the grounding resistance of the detection point, determining the grounding resistance of the shell of the electrical equipment according to the grounding resistance of the detection point, and judging whether the electrical equipment is a fault point or not according to the grounding resistance of the shell of the electrical equipment and a preset first resistance threshold value, so that the fault point causing the arcing fault of the insulating pad is determined, and the problem of the arcing fault of the insulating pad is fundamentally solved.
In one embodiment, as shown in fig. 2, the insulation pad arcing fault detection method further includes:
step S500, if the grounding resistance of the electric service equipment shell is larger than the first resistance threshold value and smaller than the preset second resistance threshold value, the electric service equipment is determined to be a hidden danger point.
Whether the resistivity of soil is low or not or the contact resistance of the armor and the shielding layer of the cable in contact with the outer shell of the electrical equipment is too high needs to be considered, and at the moment, the fault of the contact of the outer shell of the electrical equipment in contact with the armor or the shielding layer of the cable or the hidden fault danger exists. The second resistance threshold value is the grounding resistance of the electrical equipment shell in a normal state, and if the grounding resistance of the electrical equipment shell is larger than the second resistance threshold value, the electrical equipment shell does not have a fault of touching and connecting with the cable armor or the shielding layer. Therefore, when the grounding resistance of the electric service equipment shell is larger than the first resistance threshold value and smaller than the preset second resistance threshold value, the electric service equipment is determined to be a hidden danger point.
In one embodiment, as shown in fig. 3, the step of determining the detection point comprises:
step S110, detecting whether an open circuit occurs between the test point and the grounding body of the electric service equipment; wherein, the test point is any one point on the shell of the electrical equipment.
Selecting any point from the shell of the electrical equipment as a test point, detecting whether the test point and the grounding body of the electrical equipment are broken by using a test instrument such as a multimeter, and if the electrical connection between the test point and the grounding body of the electrical equipment is normal, the test point and the grounding body of the electrical equipment have the equal potential, namely the test point and the grounding body of the electrical equipment are not broken.
And step S120, if not, determining the test point as a detection point.
And the test point can be determined as the detection point when no open circuit occurs between the test point and the grounding body of the electrical service equipment.
Step S130, if the test point and the grounding body of the electrical equipment are disconnected, another point is reselected as the test point, and step S110 is executed.
In one embodiment, the number of detection points is determined to be three or more.
In order to improve the accuracy of detecting the arcing fault of the insulating pad, three or more detection points can be determined for detecting the grounding resistance, and detection errors are eliminated.
In one embodiment, as shown in fig. 4, the step of determining the ground resistance of the electrical service equipment housing from the ground resistance of the detection point includes:
step S310, calculating an average value according to the grounding resistance of each detection point.
And step S320, determining the average value as the grounding resistance of the electrical equipment shell.
And if only one detection point exists, the grounding resistance of the detection point is the average value, and the grounding resistance of the detection point is determined as the grounding resistance of the shell of the electrical equipment. If a plurality of detection points exist, the grounding resistance of each detection point is accumulated, the sum of the resistances is calculated, the sum of the resistances is divided by the number of the detection points to obtain an average value, and the average value is determined as the grounding resistance of the shell of the electrical equipment.
In one embodiment, as shown in fig. 5, the insulation pad arcing fault detection method further includes:
step S600, short-circuiting the shell of the electric service equipment with the shells of other electric service equipment; the other electric service equipment is equipment which is connected with the steel rail through the same connecting wire with the electric service equipment.
On the electrified track, a plurality of electric appliances may need to be connected to the same steel rail, so that connection exists between the electric appliances, and when the ground resistance of the shell of one of the electric appliances is detected, the connection is influenced by other electric appliances. Therefore, when a plurality of electric service equipment are connected with the steel rail through the same connecting line, the current detected electric service equipment shell can be in short circuit with the rest of the electric service equipment shells, so that the rest of the electric service equipment shells are equal in potential to the current detected electric service equipment shell, and the accuracy can be improved by detecting the electric service equipment at the moment.
In one embodiment, the connection between different electrical equipment and the steel rail can be sequentially disconnected, and then the grounding resistance of the shell of the disconnected electrical equipment is detected, that is, the connection between the electrical equipment to be detected and other electrical equipment is disconnected.
In one embodiment, the ground resistance of the test point is measured using a tripolar method.
Three poles of the three-pole method are respectively a test pole G, a voltage pole P and a current pole C. When measuring, G, P, C three poles are placed on a straight line and must be perpendicular to the earth screen. According to the concept of the grounding resistance, a grounding electrode-to-ground power frequency voltage U is obtained between G, PGAnd G, C, a loop is formed through the ground to obtain loop power frequency current I, namely G point current. Passing through type
Figure BDA0002520258400000091
Finally, the power frequency grounding resistance R of the tested grounding device is obtainedG. The power frequency power supply is arranged in a general test instrument, a test key is pressed, and the final power frequency resistance test value is directly displayed through the operation of an internal circuit. The current pole C is positioned at the far end and aims to enable a current path to have a path to be searched and collect power frequency test current. Usually it is placed so that d is satisfiedGCD is the maximum diagonal length of the grounding device to be tested (namely the electrical equipment shell). The voltage pole is convenient for the grounding device and the zero potential reference point of the earthVoltage measurement in between. Therefore, the position of the voltage pole is determined by the zero potential area of the ground. Theoretically, infinity is a ground zero reference point, and therefore a reference point needs to be found in a relatively close, acceptable area that can be considered approximately as zero potential. When the voltage electrode is used to select the potential of the point, the potential difference between the point and the tested grounding device is the voltage required by the test.
Specifically, a ground resistance tester is required to detect the ground resistance of the detection point. The ground resistance tester can use a ground megger, a digital ground resistance meter and other ground resistance test equipment which can adopt a tripolar method for measurement.
In one embodiment, the first resistance threshold is 20 Ω.
When the armor or the shielding layer of the cable is in contact with the electrical equipment shell, because the grounding resistance of the signal ground net is lower and is generally below 10 ohms, when the armor or the shielding layer of the cable is in contact with the electrical equipment shell, the contact resistance is higher, and a doubled margin is reserved, the first resistance threshold value can be set to be 20 ohms, and when the grounding resistance of the electrical equipment shell is below 20 ohms, the phenomenon that the armor and the shielding layer of the cable are in contact with the equipment shell can be considered to exist. In one embodiment, the first resistance threshold may be set to 10 Ω or other values.
In one embodiment, the second resistance threshold is 100 Ω.
Tests show that when the armor and the shielding layer of the cable are not in contact with the electrical equipment shell, the electrical equipment shell can only be grounded through the part of the grounding body buried underground, and the grounding resistance of the electrical equipment shell is usually over 100 ohms at the moment. The second resistance threshold may be set to 100 omega. In some embodiments, the second resistance threshold may be set to other values depending on the electrical equipment or the environmental impact.
In one embodiment, as shown in fig. 6, the insulation pad arcing fault detection method further includes:
and S700, detecting the hidden danger points according to a preset period.
When the grounding resistance of the shell of the electric service equipment is larger than the first resistance threshold value and smaller than the preset second resistance threshold value, the electric service equipment is determined as a hidden danger point, so that the hidden danger point can be detected according to a preset period to avoid the occurrence of the arc burning fault of the insulating pad, the fault risk is eliminated, and the reliability of rail operation is improved.
It should be understood that although the various steps in the flowcharts of fig. 1-6 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 some of the steps in fig. 1-6 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 some of the other steps.
In one embodiment, the method for testing the arcing fault of the insulating pad is applied to insulating pad arcing fault testing equipment and comprises the following steps:
acquiring the grounding resistance of a detection point;
determining the grounding resistance of the electrical equipment shell according to the grounding resistance of the detection point;
if the grounding resistance of the electric service equipment shell is smaller than a preset first resistance threshold value, determining that the electric service equipment is a fault point;
and outputting a fault point prompt, wherein the fault point prompt is used for prompting a tester that the current electric service equipment is a fault point.
In one embodiment, the insulation pad arcing fault testing method further includes:
if the grounding resistance of the electrical equipment shell is larger than the first resistance threshold value and smaller than a preset second resistance threshold value, determining that the electrical equipment is a hidden danger point;
and outputting a hidden danger point prompt, wherein the hidden danger point prompt is used for prompting a tester that the current electric service equipment is a hidden danger point.
In one embodiment, the step of determining the ground resistance of the electrical service equipment housing from the ground resistance of the detection point comprises:
calculating an average value according to the grounding resistance of each detection point;
the average value is determined as the ground resistance of the electrical equipment housing.
In one embodiment, the insulation pad arcing fault testing method further includes:
and detecting the hidden danger points according to a preset period.
For specific limitations of the insulation pad arcing fault testing method, reference may be made to the above limitations of the insulation pad arcing fault detection method, which are not described herein again.
In one embodiment, an insulation pad arcing fault testing apparatus is provided, including: the ground resistance obtains module, ground resistance and confirms module, fault point and confirms module and fault point prompt module, wherein:
the grounding resistance acquisition module is used for acquiring the grounding resistance of the detection point;
the grounding resistance determining module is used for determining the grounding resistance of the shell of the electrical equipment according to the grounding resistance of the detection point;
the fault point determining module is used for determining the electric service equipment as a fault point when the grounding resistance of the shell of the electric service equipment is smaller than a preset first resistance threshold value;
and the fault point prompt module is used for outputting a fault point prompt which is used for prompting a tester that the current electric service equipment is a fault point.
In one embodiment, the insulation pad arcing fault testing apparatus further includes:
the hidden danger point determining module is used for determining the electric service equipment as a hidden danger point when the grounding resistance of the shell of the electric service equipment is greater than the first resistance threshold value and smaller than a preset second resistance threshold value;
and the hidden danger point prompting module is used for outputting hidden danger point prompts which are used for prompting a tester that the current electric service equipment is a hidden danger point.
In one embodiment, the ground resistance determination module includes:
the average value calculating module is used for calculating an average value according to the grounding resistance of each detection point;
and the first determining module is used for determining the average value as the grounding resistance of the electrical equipment shell.
In one embodiment, the insulation pad arcing fault testing apparatus further includes:
and the period detection module is used for detecting the hidden danger points according to a preset period.
For the specific definition of the insulation pad arcing fault testing device, reference may also be made to the above definition of the insulation pad arcing fault detection method, which is not described herein again. All or part of each module in the insulation pad arcing fault testing device can be realized 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.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 7. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement an insulation pad arcing fault testing method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 7 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring the grounding resistance of a detection point;
determining the grounding resistance of the electrical equipment shell according to the grounding resistance of the detection point;
if the grounding resistance of the electric service equipment shell is smaller than a preset first resistance threshold value, determining that the electric service equipment is a fault point;
and outputting a fault point prompt, wherein the fault point prompt is used for prompting a tester that the current electric service equipment is a fault point.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
if the grounding resistance of the electrical equipment shell is larger than the first resistance threshold value and smaller than a preset second resistance threshold value, determining that the electrical equipment is a hidden danger point;
and outputting a hidden danger point prompt, wherein the hidden danger point prompt is used for prompting a tester that the current electric service equipment is a hidden danger point.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
calculating an average value according to the grounding resistance of each detection point;
the average value is determined as the ground resistance of the electrical equipment housing.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and detecting the hidden danger points according to a preset period.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring the grounding resistance of a detection point;
determining the grounding resistance of the electrical equipment shell according to the grounding resistance of the detection point;
if the grounding resistance of the electric service equipment shell is smaller than a preset first resistance threshold value, determining that the electric service equipment is a fault point;
and outputting a fault point prompt, wherein the fault point prompt is used for prompting a tester that the current electric service equipment is a fault point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
if the grounding resistance of the electrical equipment shell is larger than the first resistance threshold value and smaller than a preset second resistance threshold value, determining that the electrical equipment is a hidden danger point;
and outputting a hidden danger point prompt, wherein the hidden danger point prompt is used for prompting a tester that the current electric service equipment is a hidden danger point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
calculating an average value according to the grounding resistance of each detection point;
the average value is determined as the ground resistance of the electrical equipment housing.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and detecting the hidden danger points according to a preset period.
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. An insulation pad arcing fault detection method is characterized by comprising the following steps:
determining a detection point, wherein the detection point is a position on the shell of the electrical equipment, which is normally electrically connected with the grounding body of the electrical equipment;
measuring the grounding resistance of the detection point;
determining the grounding resistance of the electrical equipment shell according to the grounding resistance of the detection point;
and if the grounding resistance of the electric service equipment shell is smaller than a preset first resistance threshold value, determining that the electric service equipment is a fault point.
2. The insulation pad arcing fault detection method of claim 1, further comprising:
and if the grounding resistance of the electric service equipment shell is larger than the first resistance threshold value and smaller than a preset second resistance threshold value, determining that the electric service equipment is a hidden danger point.
3. The insulation pad arcing fault detection method as set forth in claim 1, wherein the step of determining the detection point comprises:
detecting whether an open circuit occurs between the test point and the grounding body of the electrical equipment; the test point is any one point on the shell of the electrical service equipment;
if not, determining the test point as a detection point.
4. The insulation pad arcing fault detection method as claimed in claim 3, wherein the number of the certain detection points is three or more.
5. The insulation blanket arcing fault detection method of claim 4, wherein said step of determining a ground resistance of said electrical service equipment enclosure from a ground resistance of said detection point comprises:
calculating an average value according to the grounding resistance of each detection point;
determining the average value as the grounding resistance of the electrical equipment housing.
6. The insulation pad arcing fault detection method of claim 1, further comprising:
short-circuiting the electric service equipment shell with other electric service equipment shells; and the other electric service equipment is equipment which is connected with the electric service equipment through the same connecting wire.
7. The insulation blanket arcing fault detection method of claim 1, wherein a tripolar method is used to measure the ground resistance of the detection point.
8. The insulation blanket arcing fault detection method of claim 1 or 2, wherein the first resistance threshold is 20 Ω.
9. The insulation pad arcing fault detection method as recited in claim 2, wherein the second resistance threshold is 100 Ω.
10. The insulation pad arcing fault detection method of claim 2, further comprising:
and detecting the hidden danger points according to a preset period.
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