CN108414875B - Positioning method and system for detecting abnormal grounding of large-scale enclosed bus shell - Google Patents
Positioning method and system for detecting abnormal grounding of large-scale enclosed bus shell Download PDFInfo
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- CN108414875B CN108414875B CN201810208928.7A CN201810208928A CN108414875B CN 108414875 B CN108414875 B CN 108414875B CN 201810208928 A CN201810208928 A CN 201810208928A CN 108414875 B CN108414875 B CN 108414875B
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- 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
Abstract
The invention discloses a positioning method and a system for detecting abnormal grounding of a large-scale enclosed bus shell. The system comprises: the device comprises a current booster, an induced electric field measuring device and an abnormal grounding positioning device. According to the invention, the preset alternating current is input into the shell of the closed bus to be detected, the induced electric field data of the measuring points on the shell of the closed bus to be detected is measured along the direction of the closed bus to be detected, and finally, the abnormal grounding position is quickly positioned by judging whether the induced electric field difference value between two adjacent measuring points is larger than a preset threshold value.
Description
Technical Field
The invention relates to the technical field of equipment maintenance, in particular to a positioning method and a positioning system for detecting abnormal grounding of a large-scale enclosed bus shell.
Background
The generator outlet of large nuclear power plants and conventional power plants to the main transformer and the main transformer to the booster station mostly adopt an isolated phase closed bus structure, a large current conductor is contained by a metal shell, and the design is strict on the grounding of the metal shell, and the grounding is generally single-point grounding or multipoint grounding. Due to the reasons of aging of insulating parts, complex field cross operation, dirt and the like, the situations of other abnormal grounding points on the field are not few, sometimes, fault points are hidden, the problems are difficult to find by a conventional manual inspection method, and great problems are brought to engineering construction.
Because the enclosed bus is bulky, long length, the field installation space is narrow and small, install certain height inside and outside the factory building, the electrically conductive object of cross operation (cable tray, scaffold frame or pipeline etc.) touches, insulating pad and gum cover are moist, dirty, the condition such as ageing, very easily introduce other unusual ground points about taking place the factory building, because the shell is to ground insulating part in large quantity, it is wide to distribute, the place that appears unusual ground problem at every turn is different, can only adopt people and sea tactics to carry out carpet formula search: and the search is carried out by multiple persons and multiple times in a visual inspection mode. The manual searching method has the following defects:
the method has the following defects of long average construction period and low efficiency: some abnormal grounding points are quite hidden, such as insulation degradation of rubber sleeves, overlapping of hidden cable brackets and the like, the average problem searching period reaches more than 20 days, the construction period of a project main line of a nuclear power and conventional power project is greatly influenced, and the control of the project cost is not facilitated;
defect two, the trouble-shooting success rate is not high: only abnormal grounding points within some visual angle ranges can be seen through visual inspection, the inspection cannot be carried out on the area of the visual dead angle which cannot be reached by personnel, and hidden insulation deterioration (such as insulation rubber sleeve aging) cannot be inspected, so that the problem that even most abnormal grounding points are processed, insulation is still unqualified is caused;
disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a positioning method and a positioning device for detecting abnormal grounding of a large-scale enclosed bus shell. The technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a positioning system for detecting abnormal grounding of a large enclosed bus casing, including:
the current booster is connected with one end of the closed bus shell to be tested and used for inputting preset alternating current to the closed bus shell to be tested;
the induced electric field measuring device is used for measuring induced electric field data of a measuring point on the shell of the enclosed bus to be measured one by one along the direction of the enclosed bus to be measured;
the abnormal grounding positioning device is used for judging whether the difference value of the induced electric fields between all the two adjacent measuring points is larger than a preset threshold value or not;
the abnormal grounding positioning device is also used for confirming that abnormal grounding exists between the two adjacent measuring points with difference when the difference value of the induced electric fields between the two adjacent measuring points is larger than a preset threshold value.
In the positioning system for detecting abnormal grounding of the large-scale enclosed bus shell according to the embodiment of the present invention, the induced electric field measuring device is further configured to select a new measuring point between two adjacent measuring points and collect induced electric field data of the new measuring point when the abnormal grounding positioning device determines that abnormal grounding exists between the two adjacent measuring points;
the abnormal grounding positioning device is also used for respectively judging whether the difference value of the induced electric fields between the new measuring point and two adjacent measuring points of the new measuring point is greater than a preset threshold value;
and the abnormal grounding positioning device is also used for confirming that abnormal grounding exists between the two different measuring points when the difference value of the induced electric field between the new measuring point and one of the adjacent measuring points is larger than a preset threshold value.
In the above positioning system for detecting abnormal grounding of a large enclosed bus bar housing according to an embodiment of the present invention, the induced electric field measuring device includes:
the horizontal antenna is arranged in parallel to the extending direction of the enclosed bus to be measured and is used for collecting induced electric field signals of a measuring point;
and a signal input port of the signal processing equipment is connected with two ends of the horizontal antenna through a cable and is used for processing and displaying the collected induced electric field signal.
In the positioning system for detecting abnormal grounding of the large-scale enclosed bus casing according to the embodiment of the invention,
in the above positioning system for detecting abnormal grounding of a large enclosed bus bar housing according to an embodiment of the present invention, the signal processing device includes:
the differential amplification circuit is used for amplifying the collected induced electric field signal;
the analog-to-digital converter is electrically connected with the differential amplification circuit and is used for converting the amplified induced electric field signal into a displayable digital signal;
the digital display is electrically connected with the analog-to-digital converter and used for displaying the converted digital signals;
and the power supply is respectively connected with the differential amplification circuit, the analog-to-digital converter and the digital display and is used for supplying power to the signal processing equipment.
In the positioning system for detecting abnormal grounding of the large-scale enclosed bus shell, the length of the horizontal antenna is 0.8-1.2 m.
In the positioning system for detecting abnormal grounding of the large-scale closed bus shell according to the embodiment of the invention, the insulating layer is sleeved outside the horizontal antenna, the cable is a shielded cable, and the signal processing device is arranged in the shielding box.
In the positioning system for detecting abnormal grounding of the large-scale closed bus shell, a liftable insulating support structure is vertically arranged at the midpoint of the horizontal antenna and is used for keeping the close contact between the horizontal antenna and the closed bus shell.
On the other hand, the embodiment of the invention provides a positioning method for detecting abnormal grounding of a large-scale enclosed bus shell, which adopts the positioning system for detecting abnormal grounding of the large-scale enclosed bus shell, and the method comprises the following steps:
inputting a preset alternating current to one end of a closed bus shell to be detected;
adopting a preset induced electric field measuring device to measure induced electric field data of a measuring point on a shell of the enclosed bus to be measured one by one along the direction of the enclosed bus to be measured;
judging whether the difference value of the induced electric fields between all the two adjacent measuring points is larger than a preset threshold value or not;
and if the difference value of the induced electric fields between two adjacent measuring points is larger than a preset threshold value, determining that abnormal grounding exists between the two adjacent measuring points with the difference.
In the above positioning method for detecting abnormal grounding of a large enclosed bus casing according to the embodiment of the present invention, the method further includes:
when the abnormal grounding exists between two adjacent measuring points, selecting a new measuring point between the two adjacent measuring points, and acquiring induced electric field data of the new measuring point;
respectively judging whether the difference value of the induced electric fields between the new measuring point and two adjacent measuring points of the new measuring point is greater than a preset threshold value;
and if the difference value of the induced electric field between the new measuring point and one of the adjacent measuring points is larger than a preset threshold value, determining that abnormal grounding exists between the two measuring points with the difference.
In the above positioning method for detecting abnormal grounding of a large enclosed bus casing according to the embodiment of the present invention, when it is determined that abnormal grounding exists between two adjacent measurement points, selecting a new measurement point between the two adjacent measurement points, and acquiring induced electric field data of the new measurement point includes:
and when the abnormal grounding exists between the two adjacent measurement points, selecting a middle point between the two adjacent measurement points as a new measurement point, and acquiring induced electric field data of the middle point.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
through inputting preset alternating current to the enclosed busbar shell to be detected, and along the enclosed busbar direction to be detected, the induced electric field data of the measuring point on the enclosed busbar shell to be detected is measured one by one, and finally, the position of abnormal grounding is quickly positioned through whether the induced electric field difference between two adjacent measuring points is greater than a preset threshold value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a positioning system for detecting abnormal grounding of a large enclosed bus bar housing according to an embodiment of the present invention;
fig. 2 is a diagram illustrating an operation principle of a positioning system for detecting abnormal grounding of a large enclosed bus bar housing according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a positioning system for detecting abnormal grounding of a large enclosed bus casing according to an embodiment of the present invention;
fig. 4 is a flowchart of a positioning method for detecting abnormal grounding of a large enclosed bus casing according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a positioning system for detecting abnormal grounding of a large enclosed bus shell, which is suitable for analyzing and processing faults of the large enclosed bus shell caused by abnormal grounding (few grounding points or more grounding points) in various power plants and power substations, and referring to fig. 1, the system can comprise:
and the current booster 1 is connected with one end of the closed bus shell to be tested and is used for inputting preset alternating current to the closed bus shell to be tested.
And the induced electric field measuring device 2 is used for measuring induced electric field data of a measuring point on the shell of the closed bus to be measured in a distance-by-distance mode along the direction of the closed bus to be measured.
And the abnormal grounding positioning device 3 is used for judging whether the difference value of the induced electric fields between all the two adjacent measuring points is larger than a preset threshold value.
And the abnormal grounding positioning device 3 is further used for confirming that abnormal grounding exists between the two adjacent measuring points with difference when the difference value of the induced electric fields between the two adjacent measuring points is larger than a preset threshold value.
In this embodiment, the current booster 1 is used to inject the power frequency ac power supply into the housing below one end of the enclosed bus housing to be measured, and the current magnitude is preferably measured and resolved by the data of the induced electric field. When alternating current is introduced into the conductor, an alternating magnetic field and an alternating electric field are generated around the conductor, the electric field is called a vortex electric field or an induced electric field, and the electric field intensity is related to the magnitude and the alternating frequency of the current in the conductor. According to maxwell electromagnetic field theory, when the enclosed busbar casing to be tested has an abnormal grounding point, if a certain alternating current (provided by using the current booster 1) is introduced into the enclosed busbar casing (generally made of aluminum), an annular magnetic field surrounding the circumference of the busbar and an axial induced electric field along the busbar direction are generated around the enclosed busbar casing to be tested. If abnormal grounding exists, the alternating current introduced into the closed bus shell can be shunted, so that induced electric fields on two sides of the abnormal grounding are obviously transited, and the position of the abnormal grounding can be judged according to the obvious transits.
The relationship between the induced electric field and the alternating current in the enclosed busbar shell is described below, specifically, unlike the electrostatic field, the induced electric field belongs to a vortex field and a circular field, and is based on maxwell electromagnetic induction law: the integral of the loop volume of the induced electric field is equal to the area integral of the flux variation, i.e.:
according to the formula, an infinite straight wire model cannot meet the requirement, and a closed induced electric field model needs to be constructed.
Theoretical derivation shows that the expressions of the induced electric field inside and outside the circular ring current are respectively as follows:
wherein E isg(a0) To induce the electric field strength, a0Is the distance from the center of the ring in the plane, R is the radius of the ring, mu0In order to have a dielectric constant,
is the rate of change of alternating current in the toroid.
When the distance between the two mass points inside and outside the ring and the ring body is equal and is less than one thousandth of R
When the curvature of the mass point relative to the circular ring is extremely small, the induced electric fields at the two points are basically similar, the model of the circular ring to the two points at the moment can be considered as a long straight wire model approximately, and the expressions (2) and (3) can be used as approximate expressions of the induced electric field of the long straight wire. Namely, the relation between the induced electric field and the alternating current at the measuring point is approximately and quantitatively analyzed by the formulas (2) and (3), so that the influence of the abnormal grounding on the induced electric field can be deduced, and the theoretical basis of judging the abnormal grounding is provided.
Referring to FIG. 2, assume that there are two sets of abnormal grounding points g on the enclosure of the enclosed bus1、g2When using the current booster 1 to inject the current I1When the current is grounded from two abnormal grounding points, the current is Ig1、Ig2Bus currents are respectively I1、I2、I3Since there is no grounding point on the right side, therefore I3Close to 0, magnetic induction B3And induced electric field intensity E3Substantially 0, only for environmental disturbances, at ground g2The induced electric fields on the left and right sides have obvious jump (namely the difference value of the induced electric fields is larger than a preset threshold value), if g is measured by the induced electric field measuring device2The larger magnitude of the left side induced electric field is higher than the environmental interference, and the abnormal grounding point g is formed2Accurate positioning will be possible. Similarly, due to the multi-point grounding shunting function, the current I on two sides of the abnormal grounding point g11>I2At the grounding point g1Is subjected to left and right induced electric field E1>E2(i.e., E)1And E2Is greater than a predetermined threshold), the abnormal ground point g is determined1Accurate positioning can also be achieved. In practical application, the abnormal grounding location device 3 may be a computer or the like installed with corresponding data processing software, the induced electric field data acquired by the induced electric field measurement device 2 may be directly imported into the abnormal grounding location device 3 or manually input, and certainly, the work of the abnormal grounding location device 3 may also be completed by manual replacement, but the calculation efficiency is low, and the abnormal grounding location device can be used in cooperation with the computer when the calculation amount is small, and the limitation is not made here. In addition, the setting of the preset threshold value is beneficial to judging whether the acquired induced electric field is a jump caused by abnormal grounding or not, and the interference of environmental factors on the induced electric field measuring device 2 is eliminated.
Optionally, in order to further accurately locate the abnormal grounding point, the induced electric field measuring device 2 is further configured to select a new measuring point between two adjacent measuring points and acquire induced electric field data of the new measuring point when the abnormal grounding locating device confirms that there is abnormal grounding between the two adjacent measuring points.
And the abnormal grounding positioning device 3 is also used for respectively judging whether the difference value of the induced electric fields between the new measuring point and two adjacent measuring points of the new measuring point is greater than a preset threshold value.
And the abnormal grounding positioning device 3 is further used for confirming that abnormal grounding exists between the two different measuring points when the difference value of the induced electric field between the new measuring point and one of the adjacent measuring points is larger than a preset threshold value.
In this embodiment, if it is confirmed that the difference in induced electric field between two adjacent measurement points is greater than a preset threshold (i.e., abnormal grounding exists between the two measurement points), a new measuring point is selected between the two measuring points (the new measuring point is preferably the middle point between the two measuring points, if other equipment is in the middle point and cannot be measured, the new measuring point can be selected near the middle point), whether the difference value of the induced electric field between the new measuring point and the two measuring points adjacent to the new measuring point is larger than a preset threshold value or not is judged respectively, if the difference in induced electric field between the new measurement point and one of the adjacent measurement points is greater than a predetermined threshold, and judging that the abnormal grounding is between the new measuring point and the measuring point, so that the range of the abnormal grounding can be further narrowed, and the abnormal grounding can be accurately positioned by repeating the operation process.
Alternatively, referring to fig. 3, the induced electric field measuring apparatus 2 may include:
the horizontal antenna 21 is arranged in parallel to the extending direction of the enclosed bus to be measured and is used for collecting induced electric field signals of a measuring point;
and a signal input port of the signal processing device 22 is connected with two ends of the horizontal antenna 21 through a cable 23, and is used for processing and displaying the collected induced electric field signal.
In the embodiment, considering that the strength of the electromotive force signal in the horizontal antenna 21 is proportional to the length, the horizontal antenna 21 should not be too short, but the too long horizontal antenna 21 causes inconvenience in operation and reduction in positioning resolution, it is considered that the antenna length is 0.8-1.2 m, preferably 1m (when the horizontal antenna 21 is set to 1m, the current booster 1 can use 40A of alternating current to meet the data acquisition requirement), and in addition, since the electric field strength varies with the distance from the current source, the closer the distance the signal is, the weaker the interference is, and the better the signal is directly close to the closed bus casing, it is preferable that the horizontal antenna 21 is sheathed with an insulating layer, and the signal is directly close to the closed bus casing during measurement. Both ends of the horizontal antenna 21 are connected with the signal processing device 22 through the cable 23, if a general cable is adopted, when the direction of the general cable is not completely vertical to the enclosed bus shell, the projection length in the horizontal direction can also induce an induced electric field, which is offset with the induced electric field of the horizontal antenna, so that the introduction of measurement interference is caused, therefore, preferably, the cable 23 adopts a shielding cable, and meanwhile, the signal processing device 22 needs to use a shielding box in order to prevent external electromagnetic interference.
Further, referring to fig. 3, the signal processing device 22 may include:
and the differential amplifying circuit 221 is used for amplifying the collected induced electric field signal.
And an analog-to-digital converter 222 electrically connected to the differential amplifying circuit 221 for converting the amplified induced electric field signal into a displayable digital signal.
And a digital display 223 electrically connected to the analog-to-digital converter for displaying the converted digital signal.
And the power supply 224 is respectively connected with the differential amplifying circuit, the analog-to-digital converter and the digital display and is used for supplying power to the signal processing equipment.
In this embodiment, since the induced electromotive force signal in the horizontal antenna 21 is a weak signal and external interference may be introduced into the lines at the two ends, the interference rejection of the signal processing device 22 can be effectively improved by using the differential amplification circuit, and the readability of data is improved. Meanwhile, the special A/D digital display module is used for packaging and displaying, and the integration level and the operability of the device can be further improved compared with the measurement by using a universal meter.
Further, referring to fig. 3, a liftable insulating support structure 24 is vertically disposed at a midpoint of the horizontal antenna 21 for maintaining the horizontal antenna in close contact with the enclosed bus bar housing.
In this embodiment, because the general distance ground of enclosed bus mounted position is more than 3m, the regional height of main transformer is more than 10m, in order to avoid the overlap joint of shell and scaffold, most scaffold frame need demolish after the installation completion, personnel carry out carpet formula search under this condition has the eminence risk of falling, the safety guarantee problem is prominent, be equipped with liftable insulating bearing structure 24 for horizontal antenna 21, can make things convenient for the measurement personnel directly to measure the operation on ground, and need not to set up the scaffold frame, measurement work safety is convenient.
In this embodiment, this positioning system for detecting abnormal grounding of large-scale enclosed bus shell has overcome the shortcoming that original scheme of looking for the ground point that visualizes is long-lived and has personnel's security, through technical upgrading, uses the non-contact method of test induced electric field, through theoretical calculation and actual measurement, can obtain the output of higher resolution ratio under the lower power frequency current condition, and the accuracy is strong, the time limit for a project is short, and the security is high. Meanwhile, due to the characteristic that the induced electric field and the current are in the same direction, the current of the shell of the closed bus is in the horizontal direction, the grounding current is in the vertical direction, the antenna is vertical to the current in the grounding direction when horizontally placed, the measuring result cannot be influenced by the induced electric field of the grounding current in the vertical direction, and the anti-interference capability is high.
According to the embodiment of the invention, the preset alternating current is input into the shell of the closed bus to be detected, the induced electric field data of the measuring points on the shell of the closed bus to be detected is measured along the direction of the closed bus to be detected, and finally, the abnormal grounding position is quickly positioned by judging whether the induced electric field difference value between two adjacent measuring points is larger than the preset threshold value.
Example two
The embodiment of the invention provides a positioning method for detecting abnormal grounding of a large-scale enclosed bus shell, which adopts the positioning system described in the first embodiment and can comprise the following steps:
and step S11, inputting a preset alternating current to one end of the closed bus shell to be tested.
In this embodiment, a current booster can be used to inject a power frequency ac power supply into the housing below one end of the enclosed bus housing to be measured, and the current magnitude is preferably measured and resolved by the data of the induced electric field.
And step S12, adopting a preset induced electric field measuring device to measure the induced electric field data of the measuring point on the shell of the enclosed bus to be measured one by one along the direction of the enclosed bus to be measured.
In this embodiment, when an alternating current is applied to the conductor, an alternating magnetic field and an alternating electric field are generated around the conductor, the electric field is called a vortex electric field or an induced electric field, and the electric field strength is related to the magnitude and the alternating frequency of the current in the conductor. According to the Maxwell electromagnetic field theory, when an abnormal grounding point exists in the enclosed bus shell to be detected, if a certain alternating current is introduced into the enclosed bus shell, an annular magnetic field surrounding the circumference of the bus and an axial induced electric field along the bus direction are generated around the enclosed bus shell to be detected. If abnormal grounding exists, the alternating current introduced into the closed bus shell can be shunted, so that induced electric fields on two sides of the abnormal grounding are obviously transited, and the position of the abnormal grounding can be judged according to the obvious transits.
And step S13, judging whether the difference value of the induced electric fields between all the adjacent two measuring points is larger than a preset threshold value.
In this embodiment, the setting of the preset threshold is beneficial to determining whether the collected induced electric field is a jump caused by abnormal grounding, and the interference of environmental factors on the induced electric field measuring device is eliminated.
In step S14, if the difference between the induced electric fields of two adjacent measurement points is greater than the preset threshold, it is determined that there is abnormal grounding between the two adjacent measurement points.
Further, in order to accurately judge the position of the abnormal ground, referring to fig. 4, the method may further include:
and step S15, when the abnormal grounding exists between the two adjacent measuring points, selecting a new measuring point between the two adjacent measuring points, and collecting the induced electric field data of the new measuring point.
In this embodiment, the new measurement point is preferably a midpoint between the two measurement points, and if there is another device at the midpoint and the measurement cannot be performed, the new measurement point may be selected near the midpoint, which is not limited herein.
And step S16, respectively judging whether the difference value of the induced electric fields between the new measuring point and two adjacent measuring points of the new measuring point is greater than a preset threshold value.
In step S17, if the difference between the induced electric fields of the new measurement point and one of the adjacent measurement points is greater than the preset threshold, it is determined that there is abnormal grounding between the two measurement points having the difference.
In this embodiment, if it is determined that the difference between the induced electric fields of two adjacent measurement points is greater than the preset threshold (i.e., there is abnormal grounding between the two measurement points), a new measurement point is reselected between the two measurement points, and whether the difference between the induced electric fields of the new measurement point and the two measurement points adjacent to the new measurement point is greater than the preset threshold is determined, and if the difference between the induced electric fields of the new measurement point and one of the adjacent measurement points is greater than the preset threshold, it is determined that abnormal grounding is present between the new measurement point and the measurement point, so that the range where the abnormal grounding is present can be further narrowed, and the above operation process is repeated, and the abnormal grounding can be accurately located.
When it needs to be described, the structure of the positioning system adopted by the positioning method is described in detail in the first embodiment, and is not described here again.
According to the embodiment of the invention, the preset alternating current is input into the shell of the closed bus to be detected, the induced electric field data of the measuring points on the shell of the closed bus to be detected is measured along the direction of the closed bus to be detected, and finally, the abnormal grounding position is quickly positioned by judging whether the induced electric field difference value between two adjacent measuring points is larger than the preset threshold value.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that: in the positioning system for detecting abnormal grounding of the large-scale enclosed bus bar housing provided in the above embodiment, when the positioning method for detecting abnormal grounding of the large-scale enclosed bus bar housing is implemented, only the division of the above functional modules is taken as an example, in practical application, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the equipment is divided into different functional modules, so as to complete all or part of the above described functions. In addition, the positioning system for detecting abnormal grounding of the large-scale enclosed bus casing and the positioning method for detecting abnormal grounding of the large-scale enclosed bus casing provided by the embodiment belong to the same concept, and specific implementation processes thereof are detailed in the method embodiment and are not described herein again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A positioning system for detecting abnormal grounding of a large-scale enclosed bus shell is characterized by comprising:
the current booster is connected with one end of the closed bus shell to be tested and used for inputting preset alternating current to the closed bus shell to be tested;
the induced electric field measuring device is used for measuring induced electric field data of a measuring point on the shell of the enclosed bus to be measured one by one along the direction of the enclosed bus to be measured;
the abnormal grounding positioning device is used for judging whether the difference value of the induced electric fields between all the two adjacent measuring points is larger than a preset threshold value or not;
the abnormal grounding positioning device is also used for confirming that abnormal grounding exists between the two adjacent measuring points when the difference value of the induced electric fields between the two adjacent measuring points is larger than a preset threshold value;
the induced electric field measuring device is also used for selecting a new measuring point between two adjacent measuring points and collecting induced electric field data of the new measuring point when the abnormal grounding positioning device confirms that abnormal grounding exists between the two adjacent measuring points;
the abnormal grounding positioning device is also used for respectively judging whether the difference value of the induced electric fields between the new measuring point and two adjacent measuring points of the new measuring point is greater than a preset threshold value;
and the abnormal grounding positioning device is also used for confirming that abnormal grounding exists between the new measuring point and one of the adjacent measuring points when the difference value of the induced electric field between the new measuring point and one of the adjacent measuring points is larger than a preset threshold value.
2. The system of claim 1, wherein the induced electric field measurement device comprises:
the horizontal antenna is arranged in parallel to the extending direction of the enclosed bus to be measured and is used for collecting induced electric field signals of a measuring point;
and a signal input port of the signal processing equipment is connected with two ends of the horizontal antenna through a cable and is used for processing and displaying the collected induced electric field signal.
3. The system of claim 2, wherein the signal processing device comprises:
the differential amplification circuit is used for amplifying the collected induced electric field signal;
the analog-to-digital converter is electrically connected with the differential amplification circuit and is used for converting the amplified induced electric field signal into a displayable digital signal;
the digital display is electrically connected with the analog-to-digital converter and used for displaying the converted digital signals;
and the power supply is respectively connected with the differential amplification circuit, the analog-to-digital converter and the digital display and is used for supplying power to the signal processing equipment.
4. The system of claim 2, wherein the horizontal antenna has a length of 0.8-1.2 m.
5. The system of claim 2, wherein the horizontal antenna is jacketed with an insulating layer, the cable is a shielded cable, and the signal processing device is disposed in a shielded enclosure.
6. The system of claim 5, wherein a liftable insulating support structure is vertically arranged at the midpoint of the horizontal antenna for keeping the horizontal antenna in close contact with the enclosed bus bar housing.
7. A positioning method for detecting abnormal grounding of a large enclosed bus shell, which adopts the system of any one of claims 1-6, and is characterized in that the method comprises the following steps:
inputting a preset alternating current to one end of a closed bus shell to be detected;
adopting a preset induced electric field measuring device to measure induced electric field data of a measuring point on a shell of the enclosed bus to be measured one by one along the direction of the enclosed bus to be measured;
judging whether the difference value of the induced electric fields between all the two adjacent measuring points is larger than a preset threshold value or not;
if the difference value of the induced electric fields between two adjacent measuring points is larger than a preset threshold value, determining that abnormal grounding exists between the two adjacent measuring points of which the difference value of the induced electric fields is larger than the preset threshold value;
the method further comprises the following steps:
when the abnormal grounding exists between two adjacent measuring points, selecting a new measuring point between the two adjacent measuring points, and acquiring induced electric field data of the new measuring point;
respectively judging whether the difference value of the induced electric fields between the new measuring point and two adjacent measuring points of the new measuring point is greater than a preset threshold value;
and if the difference value of the induced electric field between the new measuring point and one of the adjacent measuring points is larger than a preset threshold value, confirming that abnormal grounding exists between the new measuring point and one of the adjacent measuring points, wherein the difference value of the induced electric field is larger than the preset threshold value.
8. The method of claim 7, wherein when it is determined that there is abnormal grounding between two adjacent measurement points, selecting a new measurement point between the two adjacent measurement points, and collecting induced electric field data of the new measurement point comprises:
and when the abnormal grounding exists between the two adjacent measurement points, selecting a middle point between the two adjacent measurement points as a new measurement point, and acquiring induced electric field data of the middle point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810208928.7A CN108414875B (en) | 2018-03-14 | 2018-03-14 | Positioning method and system for detecting abnormal grounding of large-scale enclosed bus shell |
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