CN108594104B - Fault detection method and system for rotating diode of brushless exciter - Google Patents
Fault detection method and system for rotating diode of brushless exciter Download PDFInfo
- Publication number
- CN108594104B CN108594104B CN201810344865.8A CN201810344865A CN108594104B CN 108594104 B CN108594104 B CN 108594104B CN 201810344865 A CN201810344865 A CN 201810344865A CN 108594104 B CN108594104 B CN 108594104B
- Authority
- CN
- China
- Prior art keywords
- fuse
- state
- fault
- circle
- center
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2601—Apparatus or methods therefor
-
- 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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/265—Contactless testing
- G01R31/2656—Contactless testing using non-ionising electromagnetic radiation, e.g. optical radiation
-
- 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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/27—Testing of devices without physical removal from the circuit of which they form part, e.g. compensating for effects surrounding elements
-
- 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
- G01R31/74—Testing of fuses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Image Analysis (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a fault detection method and system for a rotating diode of a brushless exciter. The method comprises the following steps: acquiring a fuse fusing image containing a fault state indicator ejecting end from a preset shooting position, and identifying a reference pattern and a state pattern from the acquired fuse fusing image; respectively calculating the central position of the reference graph and the central position of the state graph by using a preset algorithm; and judging whether the fuse is fused or not by comparing whether the distance between the center of the state graph and the center of the reference graph exceeds a preset threshold value or not. The fault detection method for the rotating diode of the brushless exciter based on image recognition provided by the invention analyzes and monitors the fuse image shot by the fuse object, can effectively judge whether the rotating diode has a fault, has accurate and reliable judgment result, effectively solves the problem that the stroboscope observation method cannot carry out online detection, and has important significance for guaranteeing the safe and stable operation of the brushless exciter generator set.
Description
Technical Field
The invention relates to the technical field of power plant excitation systems, in particular to a fault detection method and system for a rotating diode of a brushless exciter.
Background
The brushless exciter rectifies alternating current output by the exciter into direct current through a diode and supplies the direct current to a generator rotor for excitation. As shown in fig. 1, a typical three-phase brushless exciter stator winding is powered by a static exciter, the armature winding rotates with the shaft to produce ac power, and a diode rectifier mounted on the shaft converts the ac power to dc power which is supplied to the generator rotor via conductive rods in the rotor. The brushless exciter rectifier is composed of a plurality of diodes and protective fuses, and only a certain number of fuses are allowed to be blown open during operation. The open circuit of the branch circuits with excessive number can lead to the excessive current of other branch circuits to further cause the fusing of fuses with more number, and the generator loses the exciting current, thus causing great influence on the unit and the power grid. Since the rotating diode rotates at high speed (1500 rpm for a half-speed generator) following the shaft, it is a problem how to monitor its state during operation.
The prior art solutions have two main types, one is to use a rotating diode non-conducting detection system. The branch current of the rotating diode is detected through a Hall element arranged in the exciter, and the state of the diode is judged after the current signal is detected, amplified, synchronized and compared. However, the requirement on a Hall element is high due to the high working temperature in the exciter, the waveform is distorted after the operation time is long, and the false alarm problem exists. And fault current on the generator rotor will also flow through the exciter armature winding when electrical faults occur to the exciter and generator, which will also result in hall element false alarms.
In the second stroboscopic method, a person directly performs visual inspection on a fuse of a rotating diode by using a stroboscope. The stroboscope can emit high-frequency flash light close to the rotating speed of the rotating diode, the fuse to be observed looks static or slowly moves due to the visual retention effect of human eyes, and the state detection of the rotating diode is realized by observing the state of the fuse indicator. However, the method of observing by using a stroboscope cannot realize on-line detection, and needs personnel to perform visual inspection regularly, so that the application is very limited.
Disclosure of Invention
To solve the problems of the prior art, embodiments of the present invention provide a method and system for detecting a fault of a rotating diode of a brushless exciter. The technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a method for detecting a fault of a rotating diode of a brushless exciter, where the method includes:
acquiring a fuse fusing image containing a popping end of a fault state indicator from a preset shooting position, wherein the fuse is connected with a rotating diode of a brushless exciter in series, the fault state indicator is inserted in a mounting hole in the end face of one end of the fuse, and the fusing state of the fuse is indicated by whether the popping end pops up the mounting hole or not;
identifying a reference pattern and a state pattern from the obtained fuse fusing image, wherein the reference pattern is superposed with one end face of the fuse and an axis thereof is superposed with a central axis of the mounting hole, and the state pattern is superposed with a pop-up end face of the fault state indicator and an axis thereof is superposed with a central axis of the fault state indicator;
respectively calculating the central position of the reference graph and the central position of the state graph by using a preset algorithm;
and judging whether the fuse is fused or not by comparing whether the distance between the center of the state graph and the center of the reference graph exceeds a preset threshold value or not.
In the method for detecting a fault of a rotating diode of a brushless exciter according to an embodiment of the present invention, the reference pattern includes: at least one with the mounting hole is coaxial and with the first circular of the one end terminal surface coincidence of fuse, the state figure includes: at least one second circle coaxial with the fault status indicator and coincident with the fault status indicator pop-up end face;
the step of respectively calculating the central position of the reference graph and the central position of the state graph by using a preset algorithm comprises the following steps:
and determining the circle center positions of the first circle and the second circle by using a preset Hough transform detection circle algorithm.
In the method for detecting a fault of a rotating diode of a brushless exciter according to an embodiment of the present invention, the comparing whether a distance between a center of a state pattern and a center of a reference pattern exceeds a preset threshold to determine whether a fuse is blown includes:
and judging whether the fuse is fused or not by comparing whether the distance between the circle center of the first circle and the circle center of the second circle exceeds a preset threshold value or not.
In the method for detecting a fault of a rotating diode of a brushless exciter according to an embodiment of the present invention, the preset shooting position includes: the shooting distance is 80-120 cm, and the shooting angle is 15-25 degrees.
In the method for detecting a fault of a rotating diode of a brushless exciter according to an embodiment of the present invention, the method further includes:
and when the reference graph or the state graph cannot be identified from the obtained fuse interface image, sending a frame loss prompt to a user, wherein the frame loss prompt is used for prompting the user that the obtained fuse interface image cannot be used for fault detection of the rotating diode.
In another aspect, an embodiment of the present invention provides a system for detecting a fault of a rotating diode of a brushless exciter, including:
the acquisition module is used for acquiring a fuse fusing image containing a popping end of a fault state indicator from a preset shooting position, the fuse is connected with a rotating diode of the brushless exciter in series, the fault state indicator is inserted in a mounting hole in the end face of one end of the fuse, and the fusing state of the fuse is indicated by whether the popping end pops up the mounting hole or not;
the identification module is used for identifying a reference pattern and a state pattern from the obtained fuse fusing image, wherein the reference pattern is superposed with one end face of the fuse and an axis of the reference pattern is superposed with a central axis of the mounting hole, and the state pattern is superposed with an end face of a popping end of the fault state indicator and an axis of the state pattern is superposed with a central axis of the fault state indicator;
the calculation module is used for calculating the central position of the reference graph and the central position of the state graph respectively by using a preset algorithm;
and the judging module is used for judging whether the fuse fuses or not by comparing whether the distance between the center of the state graph and the center of the reference graph exceeds a preset threshold value or not.
In the above-mentioned fault detection system for a rotating diode of a brushless exciter according to an embodiment of the present invention, the reference pattern includes: at least one with the mounting hole is coaxial and with the first circular of the one end terminal surface coincidence of fuse, the state figure includes: at least one second circle coaxial with the fault status indicator and coincident with the fault status indicator pop-up end face;
the calculation module is further used for determining the circle center positions of the first circle and the second circle by using a preset Hough transform detection circle algorithm.
In the system for detecting a fault of a rotating diode of a brushless exciter according to an embodiment of the present invention, the determining module is further configured to determine whether the fuse is blown or not by comparing whether a distance between a center of the first circle and a center of the second circle exceeds a preset threshold.
In the system for detecting a fault of a rotating diode of a brushless exciter according to an embodiment of the present invention, the preset shooting position includes: the shooting distance is 80-120 cm, and the shooting angle is 15-25 degrees.
In the system for detecting a fault of a rotating diode of a brushless exciter according to an embodiment of the present invention, the system further includes:
and the reminding module is used for sending a frame loss reminding to a user when the reference graph or the state graph cannot be identified from the obtained fuse interface image, and the frame loss reminding is used for reminding the user that the obtained fuse interface image cannot be used for fault detection of the rotating diode.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps of obtaining a fuse fusing image containing a fault state indicator ejection end from a preset shooting position, identifying a reference pattern and a state pattern from the obtained fuse fusing image, respectively calculating the central position of the reference pattern and the central position of the state pattern by using a preset algorithm, and finally judging whether a fuse is fused or not by comparing whether the distance between the center of the state pattern and the center of the reference pattern exceeds a preset threshold value or not so as to judge whether a rotary diode breaks down or not. Therefore, the fault detection method of the rotating diode of the brushless exciter based on image recognition is utilized to analyze and monitor the fuse image shot by the fuse object, whether the rotating diode has a fault or not can be effectively judged, the judgment result is accurate and reliable, the problem that online detection cannot be carried out by a stroboscope observation method is effectively solved, and the fault detection method has important significance for guaranteeing safe and stable operation of the brushless exciter generator set.
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 diagram of a brushless exciter configuration provided by the prior art;
FIG. 2 is a flow chart of a method for detecting a fault in a rotating diode of a brushless exciter according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a fuse according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram illustrating a fault status indicator that is not popped according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram illustrating a fault status indicator being ejected according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a fault detection system for a rotating diode of a brushless exciter 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
An embodiment of the present invention provides a method for detecting a fault of a rotating diode of a brushless exciter, and referring to fig. 2, the method may include:
and step S11, acquiring a fuse fusing image containing a popping end of the fault state indicator from a preset shooting position, connecting the fuse in series with a rotating diode of the brushless exciter, inserting the fault state indicator into a mounting hole in the end face of one end of the fuse, and indicating the fusing state of the fuse by whether the popping end pops up the mounting hole.
In this embodiment, the fuse is an electric appliance that fuses a fuse body by heat generated by itself when a current exceeds a predetermined value, thereby breaking a circuit. In the brushless exciter, a fuse is connected in series with a rotating diode to form a rectifier, and also rotates at a high speed along with a rotating shaft like the rotating diode. Referring to fig. 3, a mounting hole is formed in an end face of one end of the fuse, a fault state indicator (for indicating the fusing state of the fuse) is inserted into the mounting hole, and the fusing state of the fuse is indicated by whether the ejection end (i.e., the end which can be ejected from the mounting hole) ejects the mounting hole, so that whether the rotary diode fails or not can be judged. From fig. 3, it can be known that, when the pop-up end of the fault status indicator does not pop up the mounting hole (i.e. the fuse is not blown), the end face of the pop-up end is closer to the end face of the fuse (i.e. the end face provided with the mounting hole), and when the pop-up end of the fault status indicator pops up, there is a change of a larger distance between the end face of the pop-up end and the end face of the fuse, so as to determine whether the pop-up end of the fault status indicator pops up, and further determine whether the fuse is blown (when the fault status indicator pops up, the fuse is blown). It should be noted that, in practical application, a method of regularly shooting may be adopted to monitor the rotating diode in real time, and store the shot fuse fusing image of the fuse, which is beneficial to historical query.
And step S12, identifying a reference pattern and a state pattern from the obtained fuse fusing image, wherein the reference pattern is superposed with one end face of the fuse and the central axis of the fuse is superposed with the central axis of the mounting hole, the state pattern is superposed with the pop-up end face of the fault state indicator and the central axis of the fault state indicator.
In the present embodiment, in order to determine whether the pop-up end of the fault status indicator pops up the mounting hole, a reference pattern and a status pattern are selected from a fuse-blown image, wherein the reference pattern coincides with one end face of the fuse and is an image coaxial with the mounting hole, because the mounting hole in the one end face of the fuse remains unchanged (remains unchanged with respect to the one end face of the fuse), which can be used as a basis for the determination; the status pattern is coincident with the end face of the ejection end of the fault status indicator and is a coaxial image of the fault status indicator, so that the status pattern can change along with the change of the ejection end of the fault status indicator, and whether the ejection end of the fault status indicator is ejected or not can be reflected in a limited way.
It should be noted that the cross section of the mounting hole may be circular, or may be other shapes, such as square, etc., which are not limited herein, and the shape of the fault status indicator matches with the mounting hole, which is also not limited herein.
Alternatively, referring to fig. 4 and 5, the reference pattern includes: at least one and the mounting hole is coaxial and with the first circular image of the one end terminal surface coincidence of fuse, the state figure includes: at least one second circular image coaxial with said fault status indicator and coinciding with the ejection end face of the fault status indicator.
In this embodiment, in order to more accurately find the center positions of the reference pattern and the status pattern, a plurality of concentric first circles may be generally found, and the common center of the plurality of concentric first circles may be identified as the center of the reference image, and fig. 4 and 5 illustrate a circular cross section (i.e., reference numeral 2) of the mounting hole at one end face of the fuse and a first circular ring (i.e., reference numeral 1) engraved at one end face of the fuse and concentric with the circular cross section; similarly, a plurality of concentric second circles are searched for and their common center is identified by the plurality of concentric second circles as the center of the status image, and fig. 4 and 5 show a circular boundary (i.e., reference numeral 3) of the end surface of the ejection end using the fault status indicator and a second circular ring (i.e., reference numeral 4) engraved on the end surface of the ejection end and concentric with the circular boundary. Of course, in practical application, the above options are not limited, the number and shape of the reference pattern and the status pattern are not limited, and the examples in fig. 4 and 5 are only preferred examples.
In step S13, the center position of the reference pattern and the center position of the status pattern are calculated by using a predetermined algorithm, respectively.
In this embodiment, the step S13 can be implemented as follows:
and determining the circle center positions of the first circle and the second circle by using a preset Hough transform detection circle algorithm.
Specifically, referring to fig. 4 and 5, the detection of the concentric circles is rapidly and accurately achieved by using the hough transform technique and the direction information of the perpendicular lines on the boundary points of the circles. The image is first extracted for edge points, and then the approximate radius length of each edge point is estimated by calculating the curvature of the line segment in the neighborhood of the edge point. Based on the length and direction information of the edge point radius, a line segment passing through the center of the circle and the edge point may be determined. The circle is equally divided into N (N64, i 0, 1, 2 … … 15) segments, each represented by a 64-bit binary string. Setting the edge point (x)1′,y1') is located on the ith segment arc boundary of the circle, then the candidate circle center passing over the dotted segment can be calculated by:
where i and j are the radial dispersion direction and length of the edge point, respectively.
And finally, accumulating the acquired candidate circle centers to obtain the accurate concentric circle position.
Step S14, determining whether the fuse is fused by comparing whether the distance between the center of the state pattern and the center of the reference pattern exceeds a preset threshold, and further determining whether the rotary diode fails.
In this embodiment, the step S14 can be implemented as follows:
and judging whether the fuse is fused or not by comparing whether the distance between the circle center of the first circle and the circle center of the second circle exceeds a preset threshold value or not.
In this embodiment, the distance between the center of the state pattern and the center of the reference pattern is greatly changed when the pop-up end of the fault state indicator pops up, so that the distance can be compared with a preset threshold value to judge whether the fault state indicator pops up, and further judge whether the fuse fuses. FIG. 4 is an example of a fault status indicator not popped up, where it can be seen that the center of the status pattern is also relatively close to the center of the reference pattern; FIG. 5 is an example of a fault status indicator pop-up, where the center of the status graphic is seen to be spaced relatively far from the center of the reference graphic.
It should be noted that the threshold value is closely related to the shooting position when the fuse-blown image is acquired, and preferably, the preset shooting position may include: the shooting distance (namely the distance between the camera and the end face of one end of the fuse) is 80-120 cm, and the shooting angle (namely the included angle between the shooting direction of the camera and the rotating shaft of the fuse) is 15-25 degrees.
Optionally, since a valid fuse interface image cannot be obtained every time, referring to fig. 2, the method may further include:
step S15, when the reference graph or the state graph can not be identified from the obtained fuse interface image, sending a frame loss prompt to the user, wherein the frame loss prompt is used for prompting the user that the obtained fuse interface image can not be used for detecting the fault of the rotating diode.
In practical applications, a high-speed industrial camera may be used to capture an image of the fuse rotating at a high speed of 1500rpm, with an exposure time of 1us selected so that its motion-blurred pixels are only 1/40 of the fault status indicator target pixels, providing a good image environment for fault status indicator target identification. And meanwhile, the high-brightness explosion-proof lamp is equipped for exposure compensation during high-speed shooting, and the special anti-electromagnetic interference circuit design and explosion-proof grade are provided so as to meet the use requirement of an industrial field.
The embodiment of the invention acquires the fuse fusing image containing the ejection end of the fault state indicator from the preset shooting position, then identifies the reference pattern and the state pattern from the acquired fuse fusing image, respectively calculates the central position of the reference pattern and the central position of the state pattern by using a preset algorithm, and finally judges whether the fuse is fused or not by comparing whether the distance between the center of the state pattern and the center of the reference pattern exceeds a preset threshold value or not, thereby judging whether the rotary diode has a fault or not. Therefore, the fault detection method of the rotating diode of the brushless exciter based on image recognition is utilized to analyze and monitor the fuse image shot by the fuse object, whether the rotating diode has a fault or not can be effectively judged, the judgment result is accurate and reliable, the problem that online detection cannot be carried out by a stroboscope observation method is effectively solved, and the fault detection method has important significance for guaranteeing safe and stable operation of the brushless exciter generator set.
Example two
The embodiment of the invention provides a fault detection system for a rotating diode of a brushless exciter, which implements the method described in the first embodiment, and referring to fig. 6, the system may include: the device comprises an acquisition module 100, an identification module 200, a calculation module 300 and a judgment module 400.
The acquisition module 100 is configured to acquire a fuse fusing image including a pop-up end of the fault status indicator from a preset shooting position, the fuse is connected in series with a rotating diode of the brushless exciter, the fault status indicator is inserted into a mounting hole in an end face of one end of the fuse, and the fuse fusing state of the fuse is indicated by whether the pop-up end pops up the mounting hole.
In this embodiment, the fuse is an electric appliance that fuses a fuse body by heat generated by itself when a current exceeds a predetermined value, thereby breaking a circuit. In the brushless exciter, a fuse is connected in series with a rotating diode to form a rectifier, and also rotates at a high speed along with a rotating shaft like the rotating diode. The mounting hole has been seted up on the one end terminal surface of fuse, and fault state indicator (being used for instructing fuse fusing state) cartridge indicates the fusing state of fuse through its ejection end (can follow the one end that pops out in the mounting hole promptly) whether pop out the mounting hole in this mounting hole to can judge whether the rotary diode breaks down.
In practical applications, a high-speed industrial camera may be used to capture an image of the fuse rotating at a high speed of 1500rpm, with an exposure time of 1us selected so that its motion-blurred pixels are only 1/40 of the fault status indicator target pixels, providing a good image environment for fault status indicator target identification. And meanwhile, the high-brightness explosion-proof lamp is equipped for exposure compensation during high-speed shooting, and the special anti-electromagnetic interference circuit design and explosion-proof grade are provided so as to meet the use requirement of an industrial field. It should be noted that, in practical application, a method of regularly shooting may be adopted to monitor the rotating diode in real time, and store the shot fuse fusing image of the fuse, which is beneficial to historical query.
The identification module 200 is configured to identify a reference pattern and a state pattern from the obtained fuse fusing image, where the reference pattern coincides with an end face of the fuse and an axis thereof coincides with a central axis of the installation hole, the state pattern coincides with an end face of the pop-up end of the fault state indicator and an axis thereof coincides with a central axis of the fault state indicator.
In the present embodiment, in order to determine whether the pop-up end of the fault status indicator pops up the mounting hole, a reference pattern and a status pattern are selected from a fuse-blown image, wherein the reference pattern coincides with one end face of the fuse and is an image coaxial with the mounting hole, because the mounting hole in the one end face of the fuse remains unchanged (remains unchanged with respect to the one end face of the fuse), which can be used as a basis for the determination; the status pattern is coincident with the end face of the ejection end of the fault status indicator and is a coaxial image of the fault status indicator, so that the status pattern can change along with the change of the ejection end of the fault status indicator, and whether the ejection end of the fault status indicator is ejected or not can be reflected in a limited way.
It should be noted that the cross section of the mounting hole may be circular, or may be other shapes, such as square, etc., which are not limited herein, and the shape of the fault status indicator matches with the mounting hole, which is also not limited herein.
The calculating module 300 is configured to calculate a center position of the reference pattern and a center position of the status pattern respectively by using a preset algorithm.
The judging module 400 is configured to judge whether the fuse is fused by comparing whether a distance between a center of the state pattern and a center of the reference pattern exceeds a preset threshold, so as to judge whether the rotary diode fails.
It should be noted that the threshold value is closely related to the shooting position when the fuse-blown image is acquired, and preferably, the preset shooting position may include: the shooting distance (namely the distance between the camera and the end face of one end of the fuse) is 80-120 cm, and the shooting angle (namely the included angle between the shooting direction of the camera and the rotating shaft of the fuse) is 15-25 degrees.
Optionally, the reference pattern comprises: at least one and the mounting hole is coaxial and with the first circular image of the one end terminal surface coincidence of fuse, the state figure includes: at least one second circular image coaxial with said fault status indicator and coinciding with the ejection end face of the fault status indicator.
In this embodiment, in order to more accurately find the center positions of the reference pattern and the status pattern, a plurality of concentric first circles may be generally found, and the common center of the circles is determined by the plurality of concentric first circles to serve as the center of the reference image.
Further, the calculating module 300 is further configured to determine circle center positions of the first circle and the second circle by using a preset hough transform detection circle algorithm.
Specifically, the calculation method is described in the first embodiment, and is not described herein again.
Further, the determining module 400 is further configured to determine whether the fuse is blown or not by comparing whether a distance between a circle center of the first circle and a circle center of the second circle exceeds a preset threshold.
In this embodiment, the distance between the center of the state pattern and the center of the reference pattern is greatly changed when the pop-up end of the fault state indicator pops up, so that the distance can be compared with a preset threshold value to judge whether the fault state indicator pops up, and further judge whether the fuse fuses.
Optionally, since a valid fuse interface image cannot be obtained every time, referring to fig. 6, the system may further include: a reminder module 500.
The reminding module 500 is configured to send a frame loss reminder to a user when the reference graph or the state graph cannot be identified from the obtained fuse interface image, where the frame loss reminder is used to remind the user that the obtained fuse interface image cannot be used for detecting a fault of the rotating diode.
The embodiment of the invention acquires the fuse fusing image containing the ejection end of the fault state indicator from the preset shooting position, then identifies the reference pattern and the state pattern from the acquired fuse fusing image, respectively calculates the central position of the reference pattern and the central position of the state pattern by using a preset algorithm, and finally judges whether the fuse is fused or not by comparing whether the distance between the center of the state pattern and the center of the reference pattern exceeds a preset threshold value or not, thereby judging whether the rotary diode has a fault or not. The fault detection system for the rotating diode of the brushless exciter based on image recognition is utilized to analyze and monitor the fuse image shot by the fuse object, whether the rotating diode breaks down or not can be effectively judged, the judgment result is accurate and reliable, the problem that online detection cannot be carried out by a stroboscope observation method is effectively solved, and the fault detection system has important significance for guaranteeing safe and stable operation of the brushless exciter generator set.
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 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 brushless exciter rotating diode fault detection method, the method comprising:
acquiring a fuse fusing image containing a popping end of a fault state indicator from a preset shooting position, wherein the fuse is connected with a rotating diode of a brushless exciter in series, the fault state indicator is inserted in a mounting hole in the end face of one end of the fuse, and the fusing state of the fuse is indicated by whether the popping end pops up the mounting hole or not; the preset shooting position includes: the device comprises a shooting distance and a shooting angle, wherein the shooting distance is the distance between a camera and an end face of one end of a fuse, and the shooting angle is the included angle between the shooting direction of the camera and a rotating shaft of the fuse; the shooting distance is 80-120 cm, and the shooting angle is 15-25 degrees;
identifying a reference pattern and a state pattern from the obtained fuse fusing image, wherein the reference pattern is superposed with one end face of the fuse and an axis thereof is superposed with a central axis of the mounting hole, and the state pattern is superposed with a pop-up end face of the fault state indicator and an axis thereof is superposed with a central axis of the fault state indicator;
respectively calculating the central position of the reference graph and the central position of the state graph by using a preset algorithm;
and judging whether the fuse is fused or not by comparing whether the distance between the center of the state graph and the center of the reference graph exceeds a preset threshold value or not.
2. The method of claim 1, wherein the reference pattern comprises: at least one with the mounting hole is coaxial and with the first circular of the one end terminal surface coincidence of fuse, the state figure includes: at least one second circle coaxial with the fault status indicator and coincident with the fault status indicator pop-up end face;
the step of respectively calculating the central position of the reference graph and the central position of the state graph by using a preset algorithm comprises the following steps:
and determining the circle center positions of the first circle and the second circle by using a preset Hough transform detection circle algorithm.
3. The method of claim 2, wherein determining whether the fuse is blown by comparing whether a distance between a center of the state pattern and a center of the reference pattern exceeds a preset threshold comprises:
and judging whether the fuse is fused or not by comparing whether the distance between the circle center of the first circle and the circle center of the second circle exceeds a preset threshold value or not.
4. The method of claim 1, further comprising:
and when the reference graph or the state graph cannot be identified from the obtained fuse interface image, sending a frame loss prompt to a user, wherein the frame loss prompt is used for prompting the user that the obtained fuse interface image cannot be used for fault detection of the rotating diode.
5. A brushless exciter rotating diode fault detection system, comprising:
the acquisition module is used for acquiring a fuse fusing image containing a popping end of a fault state indicator from a preset shooting position, the fuse is connected with a rotating diode of the brushless exciter in series, the fault state indicator is inserted in a mounting hole in the end face of one end of the fuse, and the fusing state of the fuse is indicated by whether the popping end pops up the mounting hole or not; the preset shooting position includes: the device comprises a shooting distance and a shooting angle, wherein the shooting distance is the distance between a camera and an end face of one end of a fuse, and the shooting angle is the included angle between the shooting direction of the camera and a rotating shaft of the fuse; the shooting distance is 80-120 cm, and the shooting angle is 15-25 degrees;
the identification module is used for identifying a reference pattern and a state pattern from the obtained fuse fusing image, wherein the reference pattern is superposed with one end face of the fuse and an axis of the reference pattern is superposed with a central axis of the mounting hole, and the state pattern is superposed with an end face of a popping end of the fault state indicator and an axis of the state pattern is superposed with a central axis of the fault state indicator;
the calculation module is used for calculating the central position of the reference graph and the central position of the state graph respectively by using a preset algorithm;
and the judging module is used for judging whether the fuse fuses or not by comparing whether the distance between the center of the state graph and the center of the reference graph exceeds a preset threshold value or not.
6. The system of claim 5, wherein the reference pattern comprises: at least one with the mounting hole is coaxial and with the first circular of the one end terminal surface coincidence of fuse, the state figure includes: at least one second circle coaxial with the fault status indicator and coincident with the fault status indicator pop-up end face;
the calculation module is further used for determining the circle center positions of the first circle and the second circle by using a preset Hough transform detection circle algorithm.
7. The system of claim 6, wherein the determining module is further configured to determine whether the fuse is blown by comparing whether a distance between a center of the first circle and a center of the second circle exceeds a preset threshold.
8. The system of claim 5, further comprising:
and the reminding module is used for sending a frame loss reminding to a user when the reference graph or the state graph cannot be identified from the obtained fuse interface image, and the frame loss reminding is used for reminding the user that the obtained fuse interface image cannot be used for fault detection of the rotating diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810344865.8A CN108594104B (en) | 2018-04-17 | 2018-04-17 | Fault detection method and system for rotating diode of brushless exciter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810344865.8A CN108594104B (en) | 2018-04-17 | 2018-04-17 | Fault detection method and system for rotating diode of brushless exciter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108594104A CN108594104A (en) | 2018-09-28 |
| CN108594104B true CN108594104B (en) | 2020-08-11 |
Family
ID=63611344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810344865.8A Active CN108594104B (en) | 2018-04-17 | 2018-04-17 | Fault detection method and system for rotating diode of brushless exciter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108594104B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244200A (en) * | 2019-05-22 | 2019-09-17 | 国家电网有限公司 | A kind of simulation system and its method of energization rotating structural elements fusing process |
| CN110765991B (en) * | 2019-09-18 | 2022-08-05 | 南京航空航天大学 | High-speed rotating electrical machine fuse real-time detection system based on vision |
| CN111191400B (en) * | 2019-12-31 | 2023-12-29 | 上海钧正网络科技有限公司 | Vehicle part life prediction method and system based on user fault reporting data |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002529904A (en) * | 1998-11-11 | 2002-09-10 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for recognizing fuse disconnection |
| CN105715620A (en) * | 2016-03-31 | 2016-06-29 | 宁波锦澄电子科技股份有限公司 | Measurement method based on image recognition technology for real-time displacement of piston of piston-type energy accumulator |
| CN206292339U (en) * | 2016-11-24 | 2017-06-30 | 上海置信电气非晶有限公司 | A kind of fuse switch monitoring device based on image recognition |
| CN107101598A (en) * | 2017-03-10 | 2017-08-29 | 华南理工大学 | A kind of piezoelectric ceramics silver strip concentricity quality automatic detection method and device |
-
2018
- 2018-04-17 CN CN201810344865.8A patent/CN108594104B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002529904A (en) * | 1998-11-11 | 2002-09-10 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for recognizing fuse disconnection |
| CN105715620A (en) * | 2016-03-31 | 2016-06-29 | 宁波锦澄电子科技股份有限公司 | Measurement method based on image recognition technology for real-time displacement of piston of piston-type energy accumulator |
| CN206292339U (en) * | 2016-11-24 | 2017-06-30 | 上海置信电气非晶有限公司 | A kind of fuse switch monitoring device based on image recognition |
| CN107101598A (en) * | 2017-03-10 | 2017-08-29 | 华南理工大学 | A kind of piezoelectric ceramics silver strip concentricity quality automatic detection method and device |
Non-Patent Citations (1)
| Title |
|---|
| "发电机励磁装置故障处理及分析";郑美龙;《设备管理与维修》;20151231(第S2期);第249-251页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108594104A (en) | 2018-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108594104B (en) | Fault detection method and system for rotating diode of brushless exciter | |
| CN102928742B (en) | Infrared image automatic fault identifying method for high-voltage equipment | |
| US4377784A (en) | Fault detection apparatus for rotor winding of rotary machine | |
| US8427333B2 (en) | System and method for detecting lightning | |
| EP2533056A2 (en) | System for Detecting Lightning Strikes on Wind Turbine Rotor Blades | |
| US4952915A (en) | Failed electrical component detector for multiphase electric machines | |
| KR20090124971A (en) | Method and apparatus for detecting a fault in a brushless exciter for a generator | |
| KR20110130364A (en) | Method and system for detecting faults in a brushless exciter for a generator | |
| Yatsugi et al. | Common diagnosis approach to three-class induction motor faults using stator current feature and support vector machine | |
| US20160274192A1 (en) | Method for testing a bar winding of a rotor of a rotating electrical machine | |
| CN110595137B (en) | Refrigeration equipment and method and device for identifying fan locked rotor | |
| CN106123947A (en) | Intelligent power detection system | |
| JP2019120219A (en) | Windmill blade lightning strike determination system and method | |
| US6956459B2 (en) | Sensing apparatus for blown fuse of rectifying wheel and associated methods | |
| Maughan et al. | Advances in motor and generator rotor health | |
| CN109799404A (en) | The deterioration rate detection method and system of surge protective device | |
| Suguna et al. | Fault localisation of electrical equipments using thermal imaging technique | |
| CN112799916A (en) | Server fan monitoring method, device and system | |
| US20210363975A1 (en) | Method for detecting lightning strikes in a wind turbine rotor blade and lightning strike measurement system | |
| KR20170030371A (en) | System for moinitoring brush of generator | |
| CN115586458A (en) | Method and system for monitoring mistaken hanging prevention of ground wire in contact network maintenance operation | |
| RU2539098C1 (en) | Method and device for improvement of detection reliability of generator ground fault at rotating electrical machine | |
| KR20190011000A (en) | One dimension distance shape descriptor based electric arc detection method and system | |
| US20190391207A1 (en) | Method for determining faults in a generator, and generator test system | |
| CN208314158U (en) | A kind of prior-warning device of power-supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |