CN110967605A - Universal ultrasonic sensor and monitoring device - Google Patents
Universal ultrasonic sensor and monitoring device Download PDFInfo
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- CN110967605A CN110967605A CN201911389757.3A CN201911389757A CN110967605A CN 110967605 A CN110967605 A CN 110967605A CN 201911389757 A CN201911389757 A CN 201911389757A CN 110967605 A CN110967605 A CN 110967605A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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Abstract
The invention provides a universal ultrasonic sensor and a monitoring device. The invention provides a universal ultrasonic sensor, comprising: the ultrasonic probe comprises an outer shell, an ultrasonic probe and a first connecting piece; the outer housing includes: the bottom plate is larger than the top surface in area; the top surface and the four side surfaces are provided with ultrasonic probes; the first connecting piece is used for connecting the ultrasonic probe and external equipment. The invention solves the problems that in the prior art, due to the limitation of the height, the structure and the like of switch cabinet equipment, a plurality of positions such as the top of the switch cabinet equipment cannot be effectively detected, and a detection blind area exists.
Description
Technical Field
The invention relates to the power technology, in particular to a universal ultrasonic sensor and a monitoring device.
Background
High-voltage switch cabinets are widely applied at present and become an indispensable important component in the power industry. However, in long-term operation, such devices are affected by moisture, high temperature, oxidation and other factors, resulting in insulation degradation of internal electrical components, partial discharge, and finally local or even large-area explosion of the devices, which results in major safety accidents and economic losses. Therefore, normal operation of the high-voltage switch cabinet is guaranteed, and important guarantee is provided for safety development of the power industry.
The partial discharge is actually a process of rapid release and migration of charges, and the process causes the unbalance of electric field stress, dielectric stress and particle force states around a discharge point to generate oscillation change, so as to generate ultrasonic waves. Therefore, monitoring and orienting the ultrasonic signals generated by the partial discharge are the key for prejudging the faults of the high-voltage switch cabinet equipment and maintaining the high-voltage switch cabinet equipment in time.
At present, the discovery of the switch cabinet partial discharge ultrasonic signals is mainly based on detection technologies, and mainly includes two types, namely non-contact ultrasonic partial discharge detection technologies and contact ultrasonic partial discharge detection technologies. The non-contact ultrasonic partial discharge detection technology is mature at present, and ultrasonic signals are sampled at fixed points at external gaps of a switch cabinet by using a handheld partial discharge detector through workers, manual judgment is carried out synchronously, and existence and occurrence positions of partial discharge are determined. The hand-held partial discharge detector converts an ultrasonic signal into an audible sound signal of a human ear by utilizing a heterodyne technology. The contact type ultrasonic partial discharge detection technology utilizes the principle that ultrasonic signals can cause the shell of the switch cabinet to vibrate through air coupling, detects the vibration condition of the cabinet body through a contact type sensor attached to the outer wall of the switch cabinet, and then completes the partial discharge detection of the switch cabinet.
However, the existing detection technology cannot realize the real-time monitoring of the partial discharge ultrasonic signals in the switch cabinet, and the detection is limited by the height, structure and the like of the switch cabinet equipment, so that the top and other positions of the switch cabinet equipment cannot be effectively detected, and a detection blind area exists.
Disclosure of Invention
The invention provides a universal ultrasonic sensor and a monitoring device, which are used for realizing multidirectional monitoring of partial discharge signals and solving the problems that in the prior art, due to the limitation of the height, the structure and the like of switch cabinet equipment, a plurality of positions such as the top of the switch cabinet equipment cannot be effectively detected and a detection blind area exists.
The invention provides a universal ultrasonic sensor, comprising:
the ultrasonic probe comprises an outer shell, an ultrasonic probe and a first connecting piece;
the outer housing includes: the bottom plate is larger than the top surface in area;
the top surface and the four side surfaces are provided with ultrasonic probes;
the first connecting piece is used for connecting the ultrasonic probe and external equipment.
Furthermore, a magnetic unit is arranged on the bottom plate.
Further, four of the side faces include: the ultrasonic probe comprises an upper inclined plane and a lower rectangular plane, wherein the upper inclined plane is in an isosceles trapezoid shape, and ultrasonic probes on four side faces are arranged on the upper inclined plane.
Further, the top surface and the upper inclined surface form an included angle of 120 degrees.
Furthermore, an opening hole is formed in the lower rectangular surface, and the first connecting piece penetrates through the opening hole to be connected with external equipment.
Further, the top surface is square.
The present invention also provides a partial discharge ultrasonic monitoring device, comprising:
the universal ultrasonic sensor, the ultrasonic signal processing unit, the microprocessor module and the communication module are arranged on the base;
the output end of the universal ultrasonic sensor is connected with the input end of the ultrasonic signal processing unit, and the output end of the ultrasonic signal processing unit is connected with the microprocessor;
the microprocessor module is connected with the communication module;
the universal ultrasonic sensor is arranged in the switch cabinet, the ultrasonic processing unit is used for amplifying, filtering and carrying out logarithmic detection on a first sensing signal sent by the ultrasonic sensor to obtain a second sensing signal, and the microprocessor module is used for determining the position of the partial discharge according to the position of a probe corresponding to the partial discharge signal when the partial discharge signal is determined to be sensed according to the second sensing signal;
the communication module is used for communicating with an upper computer or a remote control unit.
Further, the partial discharge ultrasonic monitoring device further includes:
the ultrasonic signal processing unit includes: the device comprises a front-end amplification unit, a first-stage filtering unit, a second-stage amplification unit, a second-stage filtering unit and a logarithmic amplification unit, wherein the front-end amplification unit, the first-stage filtering unit, the second-stage amplification unit, the second-stage filtering unit and the logarithmic amplification unit are sequentially connected.
According to the universal ultrasonic sensor and the monitoring device, the plurality of ultrasonic probes are arranged on the top surface and the side surface of the outer shell, and the area of the bottom surface of the outer shell is larger than that of the top surface, so that multidirectional monitoring is realized, and the problems that in the prior art, due to the limitation of the height, the structure and the like of switch cabinet equipment, effective detection cannot be carried out at many positions such as the top of the switch cabinet equipment, and a detection blind area exists are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of a universal ultrasonic sensor according to the present invention;
FIG. 2 is a front view of a gimbaled ultrasonic sensor of the present invention;
FIG. 3 is a left side view of a gimbaled ultrasonic sensor of the present invention;
fig. 4 is a schematic structural diagram of a partial discharge ultrasonic monitoring apparatus according to a first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
FIG. 1 is a schematic diagram of the overall structure of a universal ultrasonic sensor according to the present invention; FIG. 2 is a front view of a gimbaled ultrasonic sensor of the present invention; FIG. 3 is a left side view of a gimbaled ultrasonic sensor of the present invention; referring to fig. 1 to 3, the ultrasonic sensor of the present embodiment may include:
an outer shell 1, an ultrasonic probe (not shown in the figure) and a first connecting piece (not shown in the figure);
the outer case 1 includes: the device comprises a top surface 2, a bottom plate 3 and four side surfaces 4, wherein the area of the bottom plate is larger than that of the top surface;
the top surface and the four side surfaces are provided with ultrasonic probes;
the first connecting piece is used for connecting the ultrasonic probe and external equipment.
In this embodiment, the ultrasonic probe is disposed on the top surface and the side surface of the outer housing, and the first opening 7 can be disposed on the top surface and the side surface for placing the ultrasonic probe, that is, the ultrasonic probe is disposed in the first opening 7. Specifically, the first opening aperture is 16.40 mm.
In this embodiment, the ultrasonic probe is used to sense an ultrasonic signal.
In this embodiment, the first connecting member may be a wire, in this embodiment, the number of the ultrasonic probes may be five, that is, the top surface and the four side surfaces are respectively one, the five ultrasonic probes are respectively connected to the external device through wires, and the external device may be an external ultrasonic signal processing device.
In this embodiment, the area of the bottom plate is larger than that of the top surface, and when the switch cabinet is used, the bottom plate is in contact with the switch cabinet, and optionally, the bottom plate is provided with a magnetic unit. That is, the sensor can be absorbed in the switch cabinet through the magnetic absorption unit.
Specifically, in this embodiment, the four side surfaces include: the ultrasonic probe comprises an upper inclined plane 5 and a lower rectangular plane 6, wherein the upper inclined plane is in an isosceles trapezoid shape, and ultrasonic probes on four side surfaces are arranged on the upper inclined plane.
In this embodiment, the lower rectangular surface is perpendicular to the ground, and the upper inclined surface forms an angle with the top surface.
Alternatively, the top surface may be angled at 120 ° to the upper ramp surface.
In this embodiment, the top surface may be square.
In this embodiment, the bottom surface may be rectangular, specifically, the length may be 100mm, the width 80mm, and the height 3 mm; the top surface can be a square with the side length of 28.45mm, the included angle between the upper inclined plane and the top surface is 120 degrees, and the lower rectangular surface is 80mm long and 9.75mm wide.
In this embodiment, the lower rectangular surface is provided with an open hole 8, and the first connecting member passes through the open hole 8 and is connected to an external device. Specifically, the width of the hole is 7mm, and the height of the hole is 7.5 mm.
The opening 8 in this embodiment is used for passing a wire, i.e., for connecting the first connector with the outside.
In this embodiment, 8 holes may be formed in the bottom plate, wherein 4 holes are used to connect the outer shell (the corresponding positions of the outer shell are both countersunk), so as to ensure the fixed connection between the bottom plate and the outer shell. And the other 4 holes are used for fixing magnetic attraction, and the assembly of the magnetic attraction can enable the universal ultrasonic sensor to be adsorbed on the inner wall of the high-voltage switch cabinet.
The outer shell and the bottom plate are made of 6061/6063 aluminum profiles, chamfering, deburring, oil stain removing and black oxidation treatment are carried out on the surfaces of the outer shell and the bottom plate, and the use performance and the attractiveness are enhanced.
In the embodiment, the ultrasonic probes are arranged on the top surface and five sides of the side surface of the universal ultrasonic sensor for signal receiving, and the signal receiving coverage range is similar to a spatial hemisphere by combining the unique appearance structure design of the sensor.
The universal ultrasonic sensor probe can receive ultrasonic signals transmitted through an air channel, and can simultaneously realize the functions of converting the received ultrasonic signals into electric signals and transmitting the signals.
This embodiment sets up ultrasonic transducer through the unique appearance structure of sensor and five sides and carries out signal reception, realizes multi-direction monitoring, because of receiving restriction such as cubical switchboard equipment height, structure among the solution prior art, can cause a lot of positions such as cubical switchboard equipment top to effectively detect, has the problem of detecting the blind area.
Fig. 4 is a schematic structural diagram of a partial discharge ultrasonic monitoring apparatus according to a first embodiment of the present invention. As shown in fig. 4, the apparatus of the present embodiment may include:
the universal ultrasonic sensor 41, the ultrasonic signal processing unit 42, the microprocessor module 43 and the communication module 44 shown in fig. 1-3;
the output end of the universal ultrasonic sensor 41 is connected with the input end of an ultrasonic signal processing unit 42, and the output end of the ultrasonic signal processing unit 42 is connected with a microprocessor 43;
the microprocessor module is connected with the communication module 44;
the universal ultrasonic sensor 41 is disposed in the switch cabinet, the ultrasonic processing unit 42 is configured to amplify, filter, and perform logarithmic detection on the first sensing signal sent by the ultrasonic sensor 41 to obtain a second sensing signal, and the microprocessor module 43 is configured to determine a position where partial discharge occurs according to a position of a probe corresponding to the partial discharge signal when determining that the partial discharge signal is sensed according to the second sensing signal;
the communication module 44 is used for communicating with an upper computer or a remote control unit.
In this embodiment, the system further includes a power frequency triggering module 45, where the power frequency triggering module is connected to the microprocessor module, and the power frequency triggering module is configured to synchronize the timing sequence of the microprocessor module with the power frequency through the power frequency triggering module according to the power frequency characteristic of the partial discharge signal.
In this embodiment, the power frequency trigger module receives an external power frequency signal to provide a 50Hz square wave for the microprocessor module, thereby ensuring that the acquisition time sequence is synchronous with the power frequency.
In this embodiment, the microprocessor module may include: the system comprises an analog-to-digital conversion unit, an algorithm unit, a data storage unit, a data communication unit and a cloud synchronization unit;
the algorithm unit is respectively connected with the analog-to-digital conversion unit, the data storage unit, the data communication unit and the cloud end synchronization unit.
In this embodiment, the data storage unit is used for calculating data real-time storage, and data communication unit realizes data exchange, transmission etc. and high in the clouds synchronization unit for data can be read at the high in the clouds, and accessible cloud end upgrades, and analog-to-digital conversion unit is used for converting the analog signal of ultrasonic signal processing module output into the digital signal that digital circuit can discern.
Optionally, the ultrasonic signal processing unit includes: the device comprises a front-end amplification unit, a first-stage filtering unit, a second-stage amplification unit, a second-stage filtering unit and a logarithmic amplification unit, wherein the front-end amplification unit, the first-stage filtering unit, the second-stage amplification unit, the second-stage filtering unit and the logarithmic amplification unit are sequentially connected.
In this embodiment, the communication module may include: the local communication interface module and the cloud communication interface module can read and configure equipment information through a local 485 bus and a cloud TCP service.
By adopting the universal ultrasonic sensor in the embodiment, when an ultrasonic signal is generated in the switch cabinet, each probe of the sensor receives the ultrasonic signal and converts the ultrasonic signal into an electric signal to be transmitted to the corresponding ultrasonic signal processing unit for amplification, filtering and logarithmic detection. The microprocessor module analyzes and processes the waveform of the acquired signal in real time while the analog-to-digital conversion unit acquires the signal, and obtains the intensity of the ultrasonic signal of the probe in each direction according to the processing result to judge whether the signal is abnormal or not. If the signal is abnormal, the characteristics of the ultrasonic signals in different directions are further analyzed, and whether the signal is a partial discharge signal is judged according to the characteristics of the ultrasonic signals in different directions. If the partial discharge signal exists, the signal receiving coverage area of the probe determines the generation direction of the partial discharge ultrasonic signal of the equipment, and controls the equipment to alarm. Otherwise, the signal is determined to be an interference signal, and the partial discharge phenomenon does not occur. And finally, transmitting the monitoring data result by the communication module.
In the embodiment, the universal ultrasonic sensor with a specific structure is used, the multi-directional partial discharge monitoring in the switch cabinet is realized, the approximate position of the equipment with partial discharge can be determined according to the sensing signal, guidance is provided for workers, and the working efficiency is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A gimbaled ultrasonic sensor, comprising:
the ultrasonic probe comprises an outer shell, an ultrasonic probe and a first connecting piece;
the outer housing includes: the bottom plate is larger than the top surface in area;
the top surface and the four side surfaces are provided with ultrasonic probes;
the first connecting piece is used for connecting the ultrasonic probe and external equipment.
2. The gimbaled ultrasonic sensor of claim 1,
the bottom plate is provided with a magnetic unit.
3. The gimbaled ultrasonic sensor according to claim 1 or 2,
the four sides include: the ultrasonic probe comprises an upper inclined plane and a lower rectangular plane, wherein the upper inclined plane is in an isosceles trapezoid shape, and ultrasonic probes on four side faces are arranged on the upper inclined plane.
4. The gimbaled ultrasonic sensor of claim 3,
the top surface and the upper inclined plane form an included angle of 120 degrees.
5. The gimbaled ultrasonic sensor of claim 3,
the lower rectangular surface is provided with an open hole, and the first connecting piece penetrates through the open hole to be connected with external equipment.
6. The ultrasonic, gimbaled sensor of claim 5,
the top surface is square.
7. An ultrasonic partial discharge monitoring device, comprising:
the universal ultrasonic sensor, the ultrasonic signal processing unit, the microprocessor module and the communication module as claimed in any one of claims 1 to 6;
the output end of the universal ultrasonic sensor is connected with the input end of the ultrasonic signal processing unit, and the output end of the ultrasonic signal processing unit is connected with the microprocessor;
the microprocessor module is connected with the communication module;
the universal ultrasonic sensor is arranged in the switch cabinet, the ultrasonic processing unit is used for amplifying, filtering and carrying out logarithmic detection on a first sensing signal sent by the ultrasonic sensor to obtain a second sensing signal, and the microprocessor module is used for determining the position of the partial discharge according to the position of a probe corresponding to the partial discharge signal when the partial discharge signal is determined to be sensed according to the second sensing signal;
the communication module is used for communicating with an upper computer or a remote control unit.
8. The partial discharge ultrasonic monitoring device according to claim 7, further comprising:
the ultrasonic signal processing unit includes: the device comprises a front-end amplification unit, a first-stage filtering unit, a second-stage amplification unit, a second-stage filtering unit and a logarithmic amplification unit, wherein the front-end amplification unit, the first-stage filtering unit, the second-stage amplification unit, the second-stage filtering unit and the logarithmic amplification unit are sequentially connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911389757.3A CN110967605A (en) | 2019-12-27 | 2019-12-27 | Universal ultrasonic sensor and monitoring device |
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| CN201911389757.3A CN110967605A (en) | 2019-12-27 | 2019-12-27 | Universal ultrasonic sensor and monitoring device |
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| CN110967605A true CN110967605A (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415339A (en) * | 2020-09-30 | 2021-02-26 | 安徽科瑞新电气自动化有限公司 | Switch cabinet partial discharge monitoring and positioning system and positioning method thereof |
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| CN104808124A (en) * | 2015-04-30 | 2015-07-29 | 国家电网公司 | Acoustic-electric combined positioning method of switch cabinet local discharge fault positions |
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Application publication date: 20200407 |