CN105466940A - Inflatable current transformer defect monitoring device - Google Patents

Abstract

The invention relates to an inflatable current transformer defect monitoring device which comprises an inflatable voltage transformer main body, an image recognition device and a Feichal IMX6 processor, wherein the image recognition device extracts a skeleton subimage from a surface image of the inflatable voltage transformer main body, and the Feichal IMX6 processor is connected with the image recognition device and used for determining the type of a skeleton defect based on the skeleton subimage. By the method and the device, the defect type analysis can be performed on the surface of the framework of the inflatable voltage transformer main body, so that important reference data can be provided for the inspection work of maintenance personnel.

Description

Inflatable current transformer defect monitoring device

technical field

The invention relates to the field of electric power, in particular to a defect monitoring device for an inflatable current transformer.

Background technique

current. With the continuous application of many new materials, many new types of transformers have appeared, and electromagnetic transformers have been fully developed. Among them, iron core current transformers are suitable for dry type, oil-immersed type and gas-insulated type. meet the development needs of electric power construction.

The working principle of the transformer is as follows: In the power supply line, the current difference is from a few amps to tens of thousands of amps, and the voltage difference is from a few volts to several million volts. The current and voltage in the line are relatively high, such as direct measurement is very dangerous. In order to facilitate the measurement of the secondary instrument, it needs to be converted into a relatively uniform current and voltage, and the transformer is used to play the role of variable current, variable voltage and electrical isolation. Most of the display instruments are pointer-type current and voltmeters, so most of the secondary currents of the current transformers are ampere-level (such as 5, etc.). With the development of the times, most of the power measurement has reached digitalization, and the signal sampled by the computer is generally in the milliampere level (0-5V, 4-20mA, etc.). The secondary current of the miniature current transformer is milliamp level, which mainly acts as a bridge between the large transformer and the sampling. Miniature current transformers are called "instrument current transformers".

However, the existing gas-filled current transformers have the following defects: (1) the defects of unreasonable structure and low pass rate; Personnel provide valuable skeleton defect information, which can easily lead to targeted maintenance of gas-filled current transformers.

In order to overcome the above defects, the present invention proposes a gas-filled current transformer defect monitoring device, which can optimize the structure of the gas-filled current transformer in the prior art and improve the quality of the product. On this basis, a main frame self-inspection is added equipment, so as to be able to provide relevant skeleton defect parameters for the maintenance department of the gas-filled current transformer.

Contents of the invention

In order to solve the technical problems existing in the prior art, the present invention provides a defect monitoring device for gas-filled current transformers, which uses various image processing devices that can be used for detecting the skeleton of the main body of gas-filled current transformers to realize skeleton defects The identification and type detection are transmitted to the management department through the modified Bluetooth communication link. At the same time, the internal structure of the existing gas-filled current transformer is improved to improve the pass rate of the product.

According to one aspect of the present invention, a gas-filled current transformer defect monitoring device is provided, the monitoring device includes a gas-filled voltage transformer main body, an image recognition device and a Freescale IMX6 processor, and the image recognition device is obtained from the gas-filled current transformer A skeleton sub-image is extracted from the surface image of the main body of the type voltage transformer, and the Freescale IMX6 processor is connected to the image recognition device for determining the type of skeleton defect based on the skeleton sub-image.

More specifically, the gas-filled current transformer defect monitoring device includes: a gas-filled voltage transformer main body, including a base, a secondary junction box, a secondary lead sleeve, an iron core, a transformer shell, and a primary lead sleeve tube, explosion-proof plate, composite insulating sleeve and silicone rubber layer; the composite insulating sleeve is located above the base and is a cylindrical structure; the transformer shell is arranged above the composite insulating sleeve and is a cylindrical structure with a cross-sectional radius of the composite insulating sleeve Twice the radius of the cross-section of the tube; the explosion-proof disc is set on the top of the transformer shell; the silicone rubber layer is wrapped on the outside of the composite insulating sleeve; the secondary junction box is located on the side of the base for accessing the secondary lead; the secondary lead The bushing is located inside the composite insulating bushing and is connected to the secondary junction box, which is used to connect the secondary lead wire of the secondary junction box to the iron core to form a secondary winding; the primary lead bushing runs through the transformer shell horizontally The center of the center is used to connect the primary lead wire and connect the primary lead wire to the iron core to form a primary winding; the composite insulating sleeve is made of glass fiber and resin; SD memory is used to pre-store the threshold value of the number of pixels and various defect image features; high-definition camera equipment is arranged on the opposite side of the main body of the gas-filled voltage transformer, and is used to photograph the surface of the main body of the gas-filled voltage transformer to obtain corresponding surface images; Gaussian denoising The device is connected with the high-definition camera device, and is used to perform Gaussian denoising processing on the received surface image to obtain a denoising image; the smoothing processing device is connected with the Gaussian denoising device, and is used for denoising the received surface image. The image is smoothed to obtain a smooth image; the grayscale processing device is connected to the smoothing processing device, and is used to perform grayscale processing on the received smooth image to obtain a grayscale image; the column edge detection device, It is respectively connected with the grayscale processing device and the SD memory, and is used to calculate the number of black pixels in each column for the grayscale image, and record the columns with the number of black pixels greater than or equal to the pixel number threshold as Edge column; row edge detection device, connected to the grayscale processing device and the SD memory respectively, for calculating the number of black pixels in each row for the grayscale image, and the number of black pixels is greater than or equal to the number of black pixels The row of the pixel number threshold is recorded as the edge row; the skeleton segmentation device is connected respectively with the column edge detection device and the row edge detection device, and the interweaving area of the edge column and the edge row is used as the transformer skeleton existence region, and from Segment the existing region of the transformer skeleton in the grayscale image to output as a skeleton subimage, so as to separate the skeleton subimage from the background of the grayscale image; Freescale IMX6 processor, and the skeleton segmentation The device is connected to the SD memory respectively, and the skeleton sub-image is matched with various defect image features, and the type of successful matching is output as the skeleton defect type; the display device is connected with the Freescale IMX6 processor for real-time display Skeleton defect types; Bluetooth communication equipment, connected with Freescale IMX6 processor and remote power management server, used to send the skeleton defect types to the power management server in real time through the Bluetooth communication link at the server; wherein, Gaussian denoising equipment, smoothing processing equipment, grayscale processing equipment, column edge detection equipment, row edge detection equipment and skeleton segmentation equipment are integrated into an integrated circuit board; wherein the Bluetooth communication equipment Including the first search sub-device, the second search sub-device and the matching connection sub-device; wherein, the first search sub-device determines the Bluetooth piconet with the highest concentration of the Bluetooth MAC address as the target piconet according to the concentration of the MAC address in the Bluetooth scatternet, one The Bluetooth scatternet is composed of a plurality of Bluetooth piconets; the second search sub-device is connected to the first search sub-device, and in the target piconet, searches for one of the top ranked by signal strength and the number is not greater than 7 or multiple bluetooth communication devices as one or more target bluetooth devices; match the connection sub-device, connect with the second search sub-device, start the bluetooth communication connection with the one or more target bluetooth devices; wherein, when the When the number of bluetooth communication devices with signals in the target piconet is greater than or equal to 7, the number of the one or more target bluetooth devices is 7, and when the number of bluetooth communication devices with signals in the target piconet is When it is less than 7, the number of the one or more target Bluetooth devices is the number of Bluetooth communication devices with signals in the target piconet.

More specifically, in the gas-filled current transformer defect monitoring device: the resolution of the high-definition camera equipment is 3840×2160.

More specifically, in the gas-filled current transformer defect monitoring device: the high-definition camera equipment includes a CMOS sensor, a brightness sensor and an auxiliary light source.

More specifically, in the gas-filled current transformer defect monitoring device: the high-definition camera equipment determines the light intensity of the auxiliary light source according to the ambient brightness output by the brightness sensor.

More specifically, in the defect monitoring device for an inflatable current transformer: the silicone rubber layer adopts a silicone rubber shed structure, which is used for tight combination with the composite insulating sleeve.

Description of drawings

Embodiments of the present invention will be described below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a structural block diagram of the gas-filled current transformer defect monitoring device of the present invention.

Fig. 2 is a structural block diagram of the Bluetooth communication device of the gas-filled current transformer defect monitoring device of the present invention.

Reference signs: 1 main body of inflatable voltage transformer; 2 image recognition device; 3 Freescale IMX6 processor; 4 first search sub-device; 5 second search sub-device; 6 matching connection sub-device

detailed description

The implementation of the defect monitoring device for gas-filled current transformers of the present invention will be described in detail below with reference to the accompanying drawings.

The current transformer is made by using the characteristic that the primary and secondary currents of the transformer are proportional. Its working principle and equivalent circuit are the same as those of ordinary transformers, except that the primary winding is connected in series in the circuit under test, and the number of turns is very small; the secondary winding is connected to low-impedance loads such as ammeter and relay current coil, which is similar to a short circuit. The primary current (that is, the measured current) and the secondary current depend on the load of the line under test, and have nothing to do with the secondary load of the current transformer. Since the secondary side is close to a short circuit, the primary and secondary side voltages U1 and are very small, and the excitation current I0 is also very small. When the current transformer is running, the secondary side is not allowed to open. Because once the circuit is opened, the primary current becomes the excitation current, which makes the magnetic flux and the secondary voltage greatly exceed the normal value and endangers the safety of people and equipment. Therefore, no fuse is allowed in the secondary circuit of the current transformer, and it is not allowed to remove the ammeter, relay and other equipment without bypassing during operation. The wiring mode of the current transformer is determined according to the operating requirements of the load it is connected to. The most commonly used wiring methods are single-phase, three-phase star and incomplete star.

Gas-filled current transformers are the most common type of current transformers. However, the gas-filled current transformers in the prior art have the defects of unreasonable structure and low pass rate. At the same time, the gas-filled current transformers in the prior art It lacks an effective diagnosis mechanism for the structural defects of its main body, and cannot provide reference information for relevant maintenance departments.

For this reason, the present invention builds a defect monitoring device for gas-filled current transformers, which can improve the structure of gas-filled current transformers in the prior art and improve product quality. On this basis, equipment for self-detection of skeleton defects is added. The type of skeleton defect can be identified, and the existing bluetooth communication mechanism is improved, the efficiency of bluetooth communication is improved, and an effective means is provided for the transmission of on-site information of the transformer.

Fig. 1 is the structural block diagram of the gas-filled current transformer defect monitoring device of the present invention, and described monitoring device comprises gas-filled voltage transformer main body, image recognition equipment and Freescale IMX6 processor, and described image recognition equipment is from gas-filled voltage transformer A skeleton sub-image is extracted from the surface image of the main body of the transformer, and the Freescale IMX6 processor is connected to the image recognition device for determining the type of a skeleton defect based on the skeleton sub-image.

Next, the gas-filled current transformer defect monitoring device of the present invention will be described in detail.

The monitoring device includes: a main body of an inflatable voltage transformer, including a base, a secondary junction box, a secondary lead bushing, an iron core, a transformer shell, a primary lead bushing, an explosion-proof disc, a composite insulating bushing and a silicon rubber layer ;The composite insulating bushing is located above the base and has a cylindrical structure; the transformer shell is set above the composite insulating bushing and has a cylindrical structure and the cross-sectional radius is twice the cross-sectional radius of the composite insulating bushing; the explosion-proof disc is set on the mutual inductor The top of the device housing; the silicone rubber layer is wrapped on the outside of the composite insulating sleeve; the secondary junction box is located on the side of the base, used to access the secondary lead; the secondary lead sleeve is located inside the composite insulating sleeve, and the secondary Junction box connection, used to connect the secondary leads of the secondary junction box to the iron core to form a secondary winding; the primary lead sleeve runs through the center of the transformer shell horizontally, used to connect the primary leads, and connect the primary The lead wires are connected to the iron core to form a primary winding; the composite insulating sleeve is made of a combination of glass fiber and resin.

The monitoring device includes: SD memory, which is used to pre-store the pixel number threshold and various defect image features; high-definition camera equipment, which is arranged on the opposite side of the main body of the gas-filled voltage transformer, and is used to monitor the gas-filled voltage transformer. The surface of the device body is photographed to obtain a corresponding surface image; the Gaussian denoising device is connected to the high-definition camera device for performing Gaussian denoising processing on the received surface image to obtain a denoising image; the smoothing processing device, Connected with the Gaussian denoising device for smoothing the received denoising image to obtain a smooth image; grayscale processing device connected with the smoothing device for smoothing the received image Grayscale processing to obtain a grayscale image.

The monitoring device includes: column edge detection equipment, which is respectively connected to the grayscale processing equipment and the SD memory, and is used to calculate the number of black pixels in each column for the grayscale image, and calculate the number of black pixels Columns greater than or equal to the threshold value of the number of pixels are recorded as edge columns; the row edge detection device is connected to the grayscale processing device and the SD memory respectively, and is used to calculate the black pixels of each row for the grayscale image The number of the number of black pixels is greater than or equal to the row of the pixel number threshold is recorded as the edge row; the skeleton segmentation device is connected with the column edge detection device and the row edge detection device respectively, and the edge column and the edge row are interleaved The region of the transformer skeleton is used as the region where the transformer skeleton exists, and the region where the transformer skeleton exists is segmented from the grayscale image to output as a skeleton sub-image, so as to separate the skeleton sub-image from the background of the grayscale image.

The monitoring device includes: a Freescale IMX6 processor, which is respectively connected to the skeleton segmentation device and the SD memory, matches the skeleton sub-image with various defect image features, and outputs the successfully matched type as a skeleton defect Type; display device, connected with Freescale IMX6 processor, used to display the type of skeleton defect in real time; bluetooth communication device, connected with Freescale IMX6 processor and remote power management server, used to display the type of skeleton defect through bluetooth The communication link is sent to the power management server in real time. Among them, Gaussian denoising equipment, smoothing processing equipment, grayscale processing equipment, column edge detection equipment, row edge detection equipment and skeleton segmentation equipment are integrated into one integrated circuit board.

As shown in Figure 2, the Bluetooth communication device includes a first search sub-device, a second search sub-device and a matching connection sub-device; the first search sub-device determines the highest concentration of Bluetooth MAC addresses according to the concentration of MAC addresses in the Bluetooth scatternet. The bluetooth piconet is used as the target piconet, and a bluetooth scatternet is made up of a plurality of bluetooth piconets; The second search sub-device is connected with the first search sub-device, and in the target piconet, searches for the number ranked by signal strength in the target piconet. One or more Bluetooth communication devices whose number is not more than 7 are used as one or more target Bluetooth devices; match the connection sub-device, connect with the second search sub-device, and start connecting with the one or more target Bluetooth devices Bluetooth communication connections; when the number of Bluetooth communication devices with signals in the target piconet is greater than or equal to 7, the number of the one or more target Bluetooth devices is 7, and when there are signals in the target piconet When the number of Bluetooth communication devices is less than 7, the number of the one or more target Bluetooth devices is the number of Bluetooth communication devices with signals in the target piconet.

Optionally, in the gas-filled current transformer defect monitoring device: the resolution of the high-definition camera equipment is 3840×2160; the high-definition camera equipment includes a CMOS sensor, a brightness sensor and an auxiliary light source; The brightness determines the light intensity of the auxiliary light source; the silicone rubber layer can choose a silicone rubber shed structure for tight combination with the composite insulating sleeve.

In addition, the current transformer is made by using the characteristic that the primary and secondary currents of the transformer are proportional. Its working principle and equivalent circuit are the same as those of ordinary transformers, except that the primary winding is connected in series in the circuit under test, and the number of turns is very small; the secondary winding is connected to low-impedance loads such as ammeter and relay current coil, which is similar to a short circuit. The primary current (that is, the measured current) and the secondary current depend on the load of the line under test, and have nothing to do with the secondary load of the current transformer. Since the secondary side is close to a short circuit, the primary and secondary side voltages U1 and are very small, and the excitation current I0 is also very small. When the current transformer is running, the secondary side is not allowed to open. Because once the circuit is opened, the primary current becomes the excitation current, which makes the magnetic flux and the secondary voltage greatly exceed the normal value and endangers the safety of people and equipment. Therefore, no fuse is allowed in the secondary circuit of the current transformer, and it is not allowed to remove the ammeter, relay and other equipment without bypassing during operation. The wiring mode of the current transformer is determined according to the operating requirements of the load it is connected to. The most commonly used wiring methods are single-phase, three-phase star and incomplete star.

Using the gas-filled current transformer defect monitoring device of the present invention, aiming at the technical problems of the unreasonable structure of the gas-filled current transformer and the lack of skeleton self-detection in the prior art, by optimizing the structure of the gas-filled current transformer and setting targeted optimization The performance of the transformer is improved by means of equipment, and at the same time, a series of targeted high-precision image processing components are used to complete the type identification of transformer skeleton defects, thereby solving the above technical problems.

It can be understood that although the present invention has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or to be modified into equivalent changes, etc. effective example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, which do not deviate from the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims (6)

1. a gas-filled type current transformer defect inspection device, described monitoring device comprises inflatable voltage transformer (VT) main body, image recognition apparatus and Freescale IMX6 processor, described image recognition apparatus extracts skeleton subimage from the surface image of inflatable voltage transformer (VT) main body, described Freescale IMX6 processor is connected with described image recognition apparatus, for based on described skeleton subimage determination skeleton defect kind.

2. gas-filled type current transformer defect inspection device as claimed in claim 1, it is characterized in that, described monitoring device comprises:

Inflatable voltage transformer (VT) main body, comprises base, secondary terminal box, secondary lead wires sleeve pipe, iron core, transformer casing, once to go between sleeve pipe, burst disk, compound insulating sleeve and silastic-layer;

Compound insulating sleeve is positioned at above base, is cylindrical structural;

Transformer casing is arranged on above compound insulating sleeve, for cylindrical structural and cross sectional radius is the twice of compound insulating sleeve cross sectional radius;

Burst disk is arranged on the top of transformer casing;

Silastic-layer is wrapped in the outside of compound insulating sleeve;

Secondary terminal box is positioned at the side of base, for accessing secondary lead wires;

Secondary lead wires sleeve pipe is positioned at the inside of compound insulating sleeve, is connected with secondary terminal box, for the secondary lead wires of secondary terminal box being linked on iron core to form Secondary Winding;

Once go between the sleeve pipe lateral direction penetrating central authorities at transformer casing, once goes between for access, and once will go between and be linked on iron core to form a winding;

Compound insulating sleeve is that glass fibre and resin-bonded manufacture form;

SD storer, for having prestored threshold number of pixels and various defect image feature;

High-definition camera equipment, is arranged on the opposite of described inflatable voltage transformer (VT) main body, for taking the surface of described inflatable voltage transformer (VT) main body, to obtain corresponding surface image;

Gauss's denoising equipment, with described high-definition camera equipment connection, for carrying out Gauss's denoising to receiving surface image, to obtain denoising image;

Smoothing processing equipment, with described Gauss's denoising equipment connection, for the smoothing process of denoising image received, to obtain smoothed image;

Gray processing treatment facility, with described smoothing processing equipment connection, for carrying out gray processing process to the smoothed image received, to obtain gray level image;

Column border checkout equipment, is connected respectively with described gray processing treatment facility and described SD storer, for described gray level image, calculates the number of often row black picture element, and the row that the number of black picture element is more than or equal to described threshold number of pixels are designated as edge columns;

Row rim detection equipment, is connected respectively with described gray processing treatment facility and described SD storer, for described gray level image, calculates the number of often row black picture element, and the row that the number of black picture element is more than or equal to described threshold number of pixels is designated as edge lines;

Skeleton splitting equipment, be connected respectively with described column border checkout equipment and described row rim detection equipment, region edge columns and edge lines interweaved is as mutual inductor skeleton domain of the existence, and from described gray level image, be partitioned into described mutual inductor skeleton domain of the existence to export as skeleton subimage, the background of skeleton subimage from gray level image to be separated;

Freescale IMX6 processor, is connected respectively with described skeleton splitting equipment and described SD storer, is mated by described skeleton subimage with various defect image feature, and the successful kind of output matching is as skeleton defect kind;

Display device, is connected with Freescale IMX6 processor, for showing skeleton defect kind in real time;

Bluetooth communication equipment, is connected with the electrical management server of Freescale IMX6 processor and far-end, for skeleton defect kind is sent to electrical management server place in real time by bluetooth communications link;

Wherein, Gauss's denoising equipment, smoothing processing equipment, gray processing treatment facility, column border checkout equipment, row rim detection equipment and skeleton splitting equipment are integrated on one piece of surface-mounted integrated circuit;

Wherein, described Bluetooth communication equipment comprises the first search subset, the second search subset and coupling connexon equipment; Wherein, the first search subset, according to the highest micro bluetooth network of MAC Address concentration determination Bluetooth MAC address concentration in Bluetooth Scatternet as target piconet, a Bluetooth Scatternet is made up of multiple micro bluetooth network; Second search subset, searches for subset be connected with described first, in described target piconet, finds, quantity preceding by signal intensity rank and is not more than one or more Bluetooth communication equipments of 7 as one or more target Bluetooth devices; Coupling connexon equipment, search for subset be connected with described second, startup is connected with the Bluetooth communication of described one or more target Bluetooth devices;

Wherein, when there being the quantity of Bluetooth communication equipment of signal for being more than or equal to 7 in described target piconet, the quantity of described one or more target Bluetooth devices is 7, when there being the quantity of Bluetooth communication equipment of signal for being less than 7 in described target piconet, the quantity of described one or more target Bluetooth devices is the quantity of the Bluetooth communication equipment having signal in described target piconet.

3. gas-filled type current transformer defect inspection device as claimed in claim 2, is characterized in that:

The resolution of high-definition camera equipment is 3840 × 2160.

4. gas-filled type current transformer defect inspection device as claimed in claim 2, is characterized in that:

High-definition camera equipment comprises cmos sensor, luminance sensor and secondary light source.

5. gas-filled type current transformer defect inspection device as claimed in claim 4, is characterized in that:

The light intensity of the ambient brightness determination secondary light source that high-definition camera equipment exports according to luminance sensor.

6. gas-filled type current transformer defect inspection device as claimed in claim 2, is characterized in that:

Silastic-layer adopts silicon rubber umbrella skirt structure, for combining closely with compound insulating sleeve.