CN114910759A - Miniaturized partial discharge inspection positioning method and device - Google Patents
Miniaturized partial discharge inspection positioning method and device Download PDFInfo
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- CN114910759A CN114910759A CN202210572568.5A CN202210572568A CN114910759A CN 114910759 A CN114910759 A CN 114910759A CN 202210572568 A CN202210572568 A CN 202210572568A CN 114910759 A CN114910759 A CN 114910759A
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1254—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 of components, parts or materials of gas-insulated power appliances or vacuum gaps
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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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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/065—Means for detecting or reacting to mechanical or electrical defects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Testing Relating To Insulation (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to a miniaturized partial discharge inspection positioning method and a device, comprising a receiving unit, a threshold triggering unit, an ultrahigh frequency signal processing unit and an ultrasonic signal processing unit; the receiving unit comprises an ultrahigh frequency signal receiving unit and an ultrasonic signal receiving unit; the ultrasonic signal receiving unit is electrically connected with an ultrasonic signal processing unit; the ultrahigh frequency signal receiving unit is respectively and electrically connected with a threshold triggering unit and an ultrahigh frequency signal processing unit; the threshold triggering unit is respectively and electrically connected with a threshold adjusting unit and a time difference measuring unit; the threshold adjusting unit, the time difference measuring unit, the high-frequency signal processing unit and the ultrasonic signal processing unit are electrically connected with the data processing unit; the data processing unit is electrically connected with a display unit; the invention has reasonable design, compact structure and convenient use.
Description
Technical Field
The invention relates to the field of partial discharge detection and positioning, in particular to a miniaturized partial discharge detection positioning device.
Background
GIS (gas insulated switchgear) is an important power transmission device of a substation, and a GIS insulation failure causes partial discharge, which further aggravates insulation degradation. If partial discharge is present all the time, the insulation is deteriorated to a certain extent, which may result in complete damage of the insulation. Once the insulation is completely damaged and breakdown occurs, power accidents such as power failure and the like can be caused, and normal production and life are affected. Therefore, the detection of partial discharge of the GIS and the positioning of the found discharge point have important practical significance for the safe operation of the power system.
The existing GIS partial discharge detection and positioning are basically two independent systems, a patrol inspection instrument is used for performing partial discharge detection on the GIS, a high-speed oscilloscope or a high-speed acquisition card is used for acquiring ultrahigh frequency waveforms after partial discharge signals are found, and corresponding waveforms of different sensors are searched by observing the waveforms to determine time difference so as to position discharge. Has the disadvantages of more required equipment, high price, high technical level requirement of operators and the like.
Disclosure of Invention
Aiming at the problems and the defects existing in the existing GIS detection and positioning, the invention provides a two-in-one detection device, and the invention provides a new method for measuring time difference without high-speed acquisition by internally arranging a threshold adjusting unit, an ultrahigh frequency signal threshold triggering unit and a time difference measuring unit.
The GIS partial discharge inspection system realizes the GIS partial discharge inspection function by configuring three ultrahigh frequency acquisition channels, one ultrasonic acquisition channel and corresponding sensors, and realizes the GIS partial discharge positioning function by utilizing two adjacent ultrahigh frequency acquisition channels and two ultrahigh frequency sensors. The man-machine interaction interface is simple and easy to understand, the operation method is convenient and clear, and the device has the advantages of single equipment, convenience in operation, powerful functions and the like. The invention aims to solve the technical problem of providing a miniaturized partial discharge inspection positioning device.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a miniaturized partial discharge inspection positioning device comprises a receiving unit, a threshold triggering unit, an ultrahigh frequency signal processing unit and an ultrasonic signal processing unit;
the receiving unit comprises an ultrahigh frequency signal receiving unit and an ultrasonic signal receiving unit;
the ultrasonic signal receiving unit is electrically connected with an ultrasonic signal processing unit;
the ultrahigh frequency signal receiving unit is respectively and electrically connected with a threshold triggering unit and an ultrahigh frequency signal processing unit;
the threshold triggering unit is respectively and electrically connected with a threshold adjusting unit and a time difference measuring unit;
the threshold adjusting unit, the time difference measuring unit, the high-frequency signal processing unit and the ultrasonic signal processing unit are electrically connected with the data processing unit; the data processing unit is electrically connected with a display unit.
As a further improvement of the above technical solution:
the device also has an energy storage unit for supplying power to each unit module.
The ultrahigh frequency signal receiving unit comprises a No. 1 ultrahigh frequency signal receiving unit, a No. 2 ultrahigh frequency signal receiving unit and a No. 3 ultrahigh frequency signal receiving unit; the No. 1 ultrahigh frequency signal receiving unit, the No. 2 ultrahigh frequency signal receiving unit and the No. 3 ultrahigh frequency signal receiving unit are three same active ultrahigh frequency sensors and are used for collecting original ultrahigh frequency signals, filtering and amplifying the original signals and providing frequency band and gain selection;
the threshold triggering unit comprises a No. 1 ultrahigh frequency signal threshold triggering unit, a No. 2 ultrahigh frequency signal threshold triggering unit and a No. 3 ultrahigh frequency signal threshold triggering unit; the system comprises a number 1 ultrahigh frequency signal threshold triggering unit, a number 2 ultrahigh frequency signal threshold triggering unit and a number 3 ultrahigh frequency signal threshold triggering unit, wherein the number 1 ultrahigh frequency signal threshold triggering unit, the number 2 ultrahigh frequency signal threshold triggering unit and the number 3 ultrahigh frequency signal threshold triggering unit are used for detecting corresponding ultrahigh frequency signal thresholds and comparing the corresponding ultrahigh frequency signal thresholds with thresholds output by a threshold adjusting unit, and if the threshold of the corresponding ultrahigh frequency signal is detected to reach the threshold output by the threshold adjusting unit, a triggering signal is sent out;
the ultrahigh frequency signal processing unit comprises a No. 1 ultrahigh frequency signal processing unit, a No. 2 ultrahigh frequency signal processing unit and a No. 3 ultrahigh frequency signal processing unit;
the signal frequency input range of the 3 groups of ultrahigh frequency signal threshold triggering units at least needs to meet 300MHz-3 GHz.
The ultrahigh frequency signal threshold trigger unit circuit comprises resistors R1, R2 and R3, capacitors C1, C2, C3, C4 and C5, chips U41, U42 and U3, filters F1, F2, F3 and F4;
in a chip U41, a pin J1 is connected with a pin 1 of a filter F1, pins 2, 7, 8, 10 and 12 are grounded, a pin J3 is connected with a pin 1 of a filter F3, and pins 4 and 5 are respectively connected with high-frequency voltage signals V1 and V2; the pin 6 is connected with a power supply voltage 3V3, the pin 9 is connected with a pin J1 of a chip U42 through a resistor R1, pins 4 and 5 are respectively connected with high-frequency voltage signals V1 and V2 in the chip U42, the pin 6 is connected with a power supply V3V, pins 2, 7 and 8 are grounded, the pin 3 is connected with a filter F4, and the pin 9 is connected with a filter F2; one path of the output end of the pin 11 is grounded through a resistor R2, and the other path of the output end of the pin is filtered through a capacitor C2 and then sends an ultrahigh frequency signal to a chip U3; the chip U3 is grounded through a resistor R3 and a capacitor C3 which are connected in series, and is output to the time difference measuring unit through Q1, and is connected with a DA1 signal which is a threshold output signal of the threshold adjusting unit;
the signal processing unit of the No. 1 ultrahigh frequency, the signal processing unit of the No. 2 ultrahigh frequency and the signal processing unit of the No. 3 ultrahigh frequency are used for amplifying, filtering and detecting the signals received by the signal receiving unit of the No. 1 ultrahigh frequency, the signal receiving unit of the No. 2 ultrahigh frequency and the signal receiving unit of the No. 3 ultrahigh frequency respectively.
The ultrasonic signal processing unit is used for processing the signals received by the ultrasonic signal receiving unit and processing the signals;
the threshold adjusting unit is used for providing different thresholds for the ultrahigh frequency signal threshold triggering unit so as to enable the ultrahigh frequency signal threshold triggering unit to reach a triggering condition;
the time difference measuring unit is used for measuring the time difference of the trigger signals sent by the adjacent ultrahigh frequency signal threshold trigger units;
the time difference measuring unit circuit comprises resistors R5, R6, R7, R9, R12, R13 and R15, capacitors C12 and C13, crystal oscillators X1 and X2, and chips U4 and U6;
in the chip U4, a resistor R9 is electrically connected between pins 1 and 2 and pins 3 and1 of a crystal oscillator X1 are respectively connected; in the chip U4, pins 1 and 2 are grounded through capacitors C6 and C7 respectively; a resistor R15, a crystal oscillator X2 and capacitors C12 and C13 which are connected in series are respectively connected between the pins 15 and 16; the pin 17 is connected with the pin 4 of the chip U6 through a resistor R12, connected with the pin 2 of the chip U6 through a resistor R13, and connected with the pin 2 of the chip U6 through a pin 18; the pin 32 is connected with an enabling signal through a resistor R5, and resistors R6 and R7 are connected between the pins 25 and 26 in series; the pin 31 is connected with a threshold trigger signal Q1 of the chip U3, and the pin 32 is connected with a trigger signal Q2 of an adjacent ultrahigh frequency threshold trigger unit;
x1 and X2 are two crystal oscillators, X1 is a high-speed oscillator which provides a high-speed clock unit for the U4 chip to calibrate, and X2 is a 32.768kHz oscillator which is used as a reference clock to control the high-speed clock to vibrate and perform clock calibration.
R5, R6 and R7 are used for enabling U4, so that a pin 31Q 1 and a pin 32Q 2 of the U4 can receive trigger signals sent by two ultrahigh frequency signal threshold trigger units, and picosecond-level precision is provided.
The chip U4 automatically detects the time difference of the two trigger signals according to the clock signal and transmits the time difference information to the data processing unit.
And the data processing unit is used for processing the three paths of ultrahigh frequency and one path of ultrasonic signal data and the time data of the time difference measuring unit and storing the data.
And the display unit is used for displaying three paths of ultrahigh frequencies, various related maps or map combinations such as waveform and amplitude of one path of ultrasound and partial discharge positioning information.
The energy storage unit is a high-performance lithium battery and is used for providing power for the energy storage device, so that the energy storage device has longer service time.
The method is mainly used for the live detection of partial discharge in the GIS running state and the discharge position positioning of the detected partial discharge signal. The invention has high detection sensitivity, accurate measurement, powerful function and simple and convenient use, and can simultaneously receive three paths of ultrahigh frequency signals and one path of ultrasonic signal. In carrying out normal inspection on GISIn the process, any one path of ultrahigh frequency and ultrasonic signal can be used for joint detection, and the discharge signal can be found quickly and accurately due to extremely high sensitivity and excellent anti-interference performance; when partial discharge of the GIS is detected, the discharge position can be roughly determined by using an amplitude positioning method, and then the discharge point is accurately positioned by using the ultrahigh frequency time difference positioning function. The invention integrates two functions of the inspection instrument and the positioning system equipment on one hand-held equipment, has small volume and light weight, meets all requirements of GIS partial discharge live detection, and has very strong practicability. The invention has the advantages of reasonable design, low cost, firmness, durability, safety, reliability, simple operation, time and labor saving, capital saving, compact structure and convenient use. The invention uses the ultrahigh frequency signal receiving unit and the ultrasonic signal receiving unit to carry out GIS partial discharge inspection, the ultrahigh frequency signal receiving unit can carry out detection on positions such as an unshielded basin-type insulator or a shielded insulator with a pouring opening and an observation window, the ultrasonic signal receiving unit mainly detects positions such as a GIS breaker, a disconnecting link, a bus, a PT, a CT, a lightning arrester and the like, and is tightly contacted with the surface of a tank body through a special couplant, the detection process display unit can display and detect relevant partial discharge information such as corresponding waveform, amplitude, PRPD and the like in real time, and can store data and waveform at any time so as to arrange the data after the inspection is finished. The ultrahigh frequency signal and ultrasonic signal generated by partial discharge pass through the internal SF 6 And the metal shell can gradually attenuate signals and gradually reduce the amplitude in the process of transmitting the signals to the periphery, so that the corresponding ultrahigh frequency and ultrasonic amplitude detected in the inspection process can gradually reduce along with the increase of the distance from a discharge point. Therefore, when the partial discharge signal is detected, the approximate position of the discharge point can be determined by using the ultrahigh frequency and ultrasonic signal amplitude according to the amplitude positioning method, and the position with the maximum measured signal intensity is the position closest to the discharge point. Then, the position of the discharge point can be accurately determined, two ultrahigh frequency signal receiving units can be used for detecting corresponding partial discharge signals, the two ultrahigh frequency signal receiving units are respectively arranged on two sides of the position of the discharge point determined by an amplitude positioning method, the output threshold of a threshold adjusting unit is set, and the two ultrahigh frequency signal thresholds are enabled to touchThe sending units respectively reach proper triggering conditions and send out triggering signals, the time difference of the two paths of triggering signals is measured through the time difference measuring unit, the data processing unit automatically calculates the partial discharge position according to the time difference result, and relevant information is displayed through the display unit.
Drawings
Fig. 1 is a schematic diagram of a handheld GIS partial discharge inspection positioning device.
Fig. 2 is a circuit diagram of the uhf-signal-threshold-trigger-unit chip U41 of the present invention.
Fig. 3 is a schematic circuit diagram of an uhf signal threshold triggering unit according to the present invention.
Fig. 4 is a circuit diagram of the time difference measuring module of the present invention.
Fig. 5 is a schematic view of the structure of the shell of the present invention.
Fig. 6 is a schematic diagram of the GIS partial discharge detection and positioning device of the present invention.
Fig. 7 is a schematic view of the fig. 5 variation of the present invention.
Fig. 8 is a schematic diagram of an ultrasonic signal filtering circuit of the present invention.
Wherein: 1. pressing a key; 2. a front housing; 3. a data display unit; 4. an inter-board connection unit; 5. a data processing unit; 6. a signal conditioning unit; 7. an energy storage unit; 8. a rear housing; 9. a front connecting column; 10. a clamping end leg groove; 11. the back bulge is blocked with a tongue; 12. a concave end surface; 13. a screen mounting port; 14. a front card slot; 15. clamping a pin; 16. a bayonet; 17. positioning the through hole; 18. a side card slot; 19. a socket; 20. an ear hole; 21. positioning the hole column; 22. a bottom connection hole; 23. a charging interface; 24. a positioning groove; 25. and positioning the pins.
Detailed Description
Referring to fig. 1-8, the invention realizes the GIS partial discharge polling function by configuring three ultrahigh frequency acquisition channels, one ultrasonic acquisition channel and corresponding sensors, and realizes the GIS partial discharge accurate positioning function by using two adjacent ultrahigh frequency acquisition channels and two ultrahigh frequency sensors. The man-machine interaction interface is simple and easy to understand, the operation method is convenient and clear, and the device has the advantages of single equipment, convenience in operation, powerful functions and the like.
As shown in fig. 1-4, the miniaturized partial discharge inspection positioning device comprises a receiving unit, a threshold triggering unit, a high-frequency signal processing unit and an ultrasonic signal processing unit;
the receiving unit comprises a high-frequency signal receiving unit and an ultrasonic signal receiving unit;
the ultrasonic signal receiving unit is electrically connected with an ultrasonic signal processing unit;
the high-frequency signal receiving unit is respectively and electrically connected with a threshold triggering unit and a high-frequency signal processing unit;
the threshold triggering unit is respectively and electrically connected with a threshold adjusting unit and a time difference measuring unit;
the threshold adjusting unit, the time difference measuring unit, the high-frequency signal processing unit and the ultrasonic signal processing unit are electrically connected with the data processing unit; the data processing unit is electrically connected with a display unit;
the device also has an energy storage unit for supplying power to each unit module.
The high-frequency signal receiving unit comprises a No. 1 ultrahigh-frequency signal receiving unit, a No. 2 ultrahigh-frequency signal receiving unit and a No. 3 ultrahigh-frequency signal receiving unit;
the threshold triggering unit comprises a No. 1 ultrahigh frequency signal threshold triggering unit, a No. 2 ultrahigh frequency signal threshold triggering unit and a No. 3 ultrahigh frequency signal threshold triggering unit;
the high-frequency signal processing unit comprises a No. 1 ultrahigh-frequency signal processing unit, a No. 2 ultrahigh-frequency signal processing unit and a No. 3 ultrahigh-frequency signal processing unit;
the No. 1 ultrahigh frequency signal receiving unit, the No. 2 ultrahigh frequency signal receiving unit and the No. 3 ultrahigh frequency signal receiving unit are three same active ultrahigh frequency sensors and are used for filtering and amplifying original signals and providing frequency band and gain selection.
The system comprises a No. 1 ultrahigh frequency signal threshold triggering unit, a No. 2 ultrahigh frequency signal threshold triggering unit and a No. 3 ultrahigh frequency signal threshold triggering unit, wherein the threshold triggering units are used for detecting corresponding ultrahigh frequency signal thresholds and sending out triggering signals.
The signal frequency input range of the 3 groups of ultrahigh frequency signal threshold triggering units at least meets 300MHz-3GHz, so that the signals input by the ultrahigh frequency signal receiving unit are not attenuated.
As shown in fig. 2-3, the uhf signal threshold trigger unit circuit includes resistors R1, R2, R3, capacitors C1, C2, C3, C4, C5, chips U41, U42, U3, filters F1, F2, F3, F4; u41, U42, R1, F1, F2, F3 and F4 carry out primary processing on the input ultrahigh frequency signal to remove most of interference signals, U41 and U42 are radio frequency analog switches, and V1 and V2 of a 4-pin 5-pin of the radio frequency analog switch are used for controlling the on and off of the U41 and U42 analog switches, so that the received ultrahigh frequency signal passes through different paths to achieve the purpose of removing different interference signals; r2, R3, C1, C2, C3, C4, C5 and U3 are used for receiving the threshold value output by the threshold value adjusting unit, and when the threshold value of the ultrahigh frequency signal received and transmitted to the U3 exceeds the threshold value output by the threshold value adjusting unit, the U3 generates a pulse trigger signal to be transmitted to the time difference measuring unit.
The signal processing unit comprises a No. 1 ultrahigh frequency signal processing unit, a No. 2 ultrahigh frequency signal processing unit and a No. 3 ultrahigh frequency signal processing unit which are respectively used for amplifying, filtering and detecting signals received by the No. 1 ultrahigh frequency signal receiving unit, the No. 2 ultrahigh frequency signal receiving unit and the No. 3 ultrahigh frequency signal receiving unit;
and the ultrasonic signal processing unit is used for processing the signal received by the ultrasonic signal receiving unit, and amplifying, filtering and other processing are carried out on the signal. The ultrasonic signal receiving unit adopts a passive contact type ultrasonic sensor.
The threshold adjusting unit is used for providing different thresholds for the three-path ultrahigh frequency signal threshold triggering unit so as to enable the three-path ultrahigh frequency signal threshold triggering unit to respectively trigger.
The time difference measuring unit is used for measuring the time difference of the trigger signals sent by the adjacent ultrahigh frequency signal threshold trigger units.
The time difference measuring unit can measure the time difference to reach the picosecond level precision so as to ensure the accuracy of time difference measurement. The specific circuit diagram of the time difference measuring unit is shown in fig. 4: the time difference measuring unit circuit comprises R5, R6, R7, R9, R12, R13, R15, C12, C13, X1, X2, U4 and U6; wherein X1 and X2 are crystal oscillators with two different frequencies, X1 is a high-speed oscillator which provides a high-speed clock unit for the U4 chip to carry out calibration, and X2 is a 32.768kHz oscillator which is used as a reference clock to control the high-speed clock to start oscillation and carry out clock calibration. U6, R12 and R13 form a Schmitt trigger, R5, R6 and R7 are used for enabling U4, so that a pin 31Q 1 and a pin 32Q 2 of U4 can receive trigger signals sent by two ultrahigh frequency signal threshold trigger units, and picosecond-level precision is provided. When the two trigger signals are received, the U4 automatically measures the time difference of the two trigger signals according to the clock signal and transmits the time difference information to the data processing unit.
The data processing unit is a high-performance MCU and is used for processing three paths of ultrahigh frequency and one path of ultrasonic signal data and time data of the time difference measuring unit and storing related data.
The display unit is a screen of the device and is used for displaying various related maps or map combinations and partial discharge positioning information such as three paths of ultrahigh frequencies, one path of ultrasonic waveform, amplitude and the like.
The energy storage unit is a high-performance lithium battery and is used for providing power for the energy storage device, so that the energy storage device has longer service time.
As another embodiment, the structure of the device is schematically shown in fig. 1-8, and comprises a front shell 2 and a rear shell 8 which are fastened to form an outer shell; an inter-board connecting unit 4 is arranged in the outer shell, a data display unit 3 exposed out through the front shell 2 is arranged on the inter-board connecting unit 4, and a key 1 is buckled on the data display unit 3; the inter-board connecting unit 4 is electrically connected with a data processing unit 5, a signal conditioning unit 6 and an energy storage unit 7;
as an embodiment, a screen mounting port 13 is provided on the front case 2 for exposing the data display unit 3; a window for exposing the key 1 is arranged below the screen mounting port 13, and the clamping groove 14 is used for connecting the key and the connecting unit (4) between the plates;
a plurality of front connecting posts 9 are arranged on the inner wall of the front shell 2, and a corresponding bottom connecting hole 22 is arranged on the rear shell 8, so that bolts can be inserted from the outer side surface of the bottom connecting hole 22 to be connected with the hollow screw holes of the front connecting posts 9;
a clamping end foot groove 10 is formed in one corner of the upper end of the front shell 2, a concave end face 12 is formed in the upper end of the rear shell 8, and the concave end face 12 is arranged in a concave mode relative to the outer edges of the front shell 2 and the rear shell 8; the concave end surface 12 is provided with a plurality of through holes to expose the corresponding interface of the signal conditioning unit 6; the recessed end face 12 is recessed to reduce the exposed amount of the interface.
One corner of the concave end face 12 is provided with a rear convex clamping tongue 11, and the rear convex clamping tongue 11 is inserted into the clamping end foot groove 10, so that matching and direction recognition are realized, and the wrong installation direction is avoided;
the back of the data display unit 3 is provided with a plurality of clamping pins 15, and the inter-board connecting unit 4 is provided with a bayonet 16 clamped with the clamping pins 15;
a plurality of positioning through holes 17 and side clamping grooves 18 are distributed on the inter-board connecting unit 4; the positioning through hole 17 is used for penetrating through a bolt connected with the front connecting column 9;
the data processing unit 5 is provided with a plug socket 19 for being plugged with the corresponding interface of the inter-board connecting unit 4;
the signal conditioning unit 6 is provided with an ear hole 20 which penetrates through a bolt connected with the front connecting column 9, the signal conditioning unit 6 is provided with a positioning hole column 21, and the data processing unit 5 is provided with a positioning pin 25 connected with the positioning hole column 21;
be provided with the lower part wall on back shell 8 and be provided with interface 23 and positioning groove 24 that charge.
As an embodiment, the signal conditioning unit 6 is internally provided with an ultrahigh frequency signal processing module, an ultrasonic signal processing module and a filtering and amplifying module, wherein the input end of the filtering and amplifying module is electrically connected with the output end of the ultrahigh frequency signal processing module and the output end of the ultrasonic signal processing module respectively; a signal input terminal of the signal conditioning unit 6 is used as a coaxial cable input end, the input of the ultrahigh frequency signal processing module is connected with a plurality of active ultrahigh frequency sensors, and the input of the ultrasonic signal processing module is connected with a passive ultrasonic sensor;
the filtering and amplifying module comprises an ultrahigh frequency signal filtering circuit electrically connected with the ultrahigh frequency signal processing module and an ultrasonic signal filtering circuit electrically connected with the ultrasonic signal processing module;
the output end of the signal conditioning unit 6 is electrically connected with the input end of the data processing unit 5 so as to transmit partial discharge information and time difference information; the signal conditioning unit 6 is electrically connected with the data display unit 3;
the ultrahigh frequency signal and the ultrasonic signal are filtered and amplified by the signal conditioning unit 6, and the filtering frequency band and gain of the corresponding signal are controlled reasonably. And then, the processed signals are transmitted to the data processing unit 5, the data processing unit 5 processes and stores the data at the same time, and corresponding information is displayed through the data display unit 3, so that the information is displayed more visually. And the inter-board connecting unit 4 is used for electrically connecting the data display unit 3 and the data processing unit 5 to form a whole, so that the device is more stable, the energy storage unit 7 is a high-capacity lithium battery of 8.4V6400mAh, and the working time is longer. The front shell 2 and the rear shell 8 jointly form a shell for fixing each module, so that the device is firmer and is convenient to carry and use. The key 1 is used with an operation control device to perform a series of operations such as function selection, measurement storage and the like, so that the device is more humanized to use.
As an embodiment, the signal conditioning unit 6 processes a plurality of uhf signals and1 channel of ultrasonic signals simultaneously through a coaxial cable, and filters, amplifies and detects the signals, and calculates the arrival time difference between two adjacent channels of uhf signals, and then transmits the signals to the data processing unit 5, wherein the filtering frequency bands of the plurality of uhf signals include three frequency band ranges of a low frequency band, a high frequency band and a full frequency band; the 1-path ultrasonic comprises two frequency band ranges of 10KHz-80KHz and 80KHz-200 KHz.
As an embodiment, as shown in fig. 4, the uhf signal filter circuit includes analog switches U41, U42, filters F1 to F4; the analog switches U41 and U42 and the filters F1-F4 are used for acquiring three different frequency bands of the ultrahigh frequency signal;
in the analog switch U41, a pin 2 is grounded, a pin J1 is connected to a frequency band corresponding to J111N, a pin J3 is connected to a frequency band corresponding to J131N, pins 4 and 5 are respectively connected to control signals V1 and V2, a pin 6 is connected to voltage 3.3V, pins 7, 8, 10 and 12 are grounded, a pin 9 is connected to a frequency band corresponding to J121N through a corresponding resistor, and a pin 11 is connected to the data processing unit 5 through an RFC interface;
in an analog switch U42, a pin 2 is grounded, a pin J1 is connected to a frequency band corresponding to J121N, a pin 3 is connected in series to form filters F3 and F4 of secondary filtering to a frequency band corresponding to J131N, access pins 4 and 5 are respectively connected to control signals V1 and V2, a pin 6 is connected to voltage 3.3V, pins 7, 8, 10 and 12 are grounded, and a pin 9 is connected in series to form filters F1 and F2 of the secondary filtering to be connected to a frequency band corresponding to J111N;
as an embodiment, as shown in fig. 5, the ultrasonic signal filtering circuit includes analog switches U1 and U2 as band selection switches, capacitors C14, C24, C-C10, inductors L1-L10, and resistors R14 and R24;
analog switches U1 and U2, capacitors C14, C24, C34, C44, C54, C6-C10, inductors L1-L5 and resistors R14 jointly form a frequency band of 80KHz-200KHz for collecting ultrasonic signals; capacitors C6, C7, C8, C9, C10, inductors L6, L7, L8, L9, L10 and a resistor R24 jointly form a frequency band of 10KHz-80KHz of ultrasonic signals;
the capacitors C14, C24, C34, C44, C54, C6-C10, the inductors L1-L5 and the resistor R14 form a first filtering unit; the capacitors C6-C10, the inductors L6-L10 and the resistor R24 form a second filtering unit;
in the analog switch U1, a pin 5 is grounded, a pin 4 is grounded at-5V and is grounded through a corresponding capacitor, a pin 13 is grounded at +5V and is grounded through a corresponding capacitor, and pins 1 and 16 are respectively connected with corresponding ultrasonic signals;
in the analog switch U2, pins 1 and 16 are respectively connected with the data processing unit 5 through channels BAND1 and BAND 0; the pins 3 and 14 are respectively connected to the corresponding first filtering unit and the second filtering unit;
the model of the data processing unit 5 is STM32F407 high-performance MCU
The ultrasonic signal filtering circuit comprises analog switches U1 and U2; the filters F1, F2, F3 and F4 jointly form three different frequency bands of the ultrahigh frequency signal; the ultrasonic signal filtering circuit is shown in fig. 5, wherein two analog switches U1 and U2 are used as frequency band selection switches, capacitors C14, C24, C34, C44, C54, inductors L1, L2, L3, L4, L5 and a resistor R14 jointly form an 80KHz-200KHz frequency band of an ultrasonic signal, and capacitors C6, C7, C8, C9, C10, inductors L6, L7, L8, L9, L10 and a resistor R24 jointly form a 10KHz-80KHz frequency band of the ultrasonic signal.
The data processing unit 5 carries out digital processing on the received signals, automatically calculates the position of a discharge point according to the time difference signals input by the signal processing unit 6, simultaneously stores related data, and the data display unit 3 displays related information such as a discharge waveform, a discharge amplitude, a discharge position and the like.
The signal conditioning unit is provided with 4 independent channels comprising a plurality of ultrahigh frequency signal channels and1 ultrasonic signal channel, wherein the ultrahigh frequency channels have three frequency bands of a low frequency band, a high frequency band and a full frequency band which can be selected; the ultrasonic channel has two frequency bands of 10KHz-80KHz and 80KHz-200 KHz. The invention can measure the time difference of two adjacent ultrahigh frequency signals and can realize the position positioning of GIS partial discharge. The data display unit can display the PRPD atlas, the PRPS atlas, the waveform amplitude and the position related information of the fault point of the partial discharge signal.
The various embodiments may be combined as appropriate or used separately.
Claims (9)
1. The utility model provides a positioner is patrolled and examined in miniaturized office discharge which characterized in that: comprises a receiving unit, a threshold triggering unit, an ultrahigh frequency signal processing unit and an ultrasonic signal processing unit;
the receiving unit comprises an ultrahigh frequency signal receiving unit and an ultrasonic signal receiving unit;
the ultrasonic signal receiving unit is electrically connected with an ultrasonic signal processing unit;
the ultrahigh frequency signal receiving unit is respectively and electrically connected with a threshold triggering unit and an ultrahigh frequency signal processing unit;
the threshold triggering unit is respectively and electrically connected with a threshold adjusting unit and a time difference measuring unit;
the threshold adjusting unit, the time difference measuring unit, the high-frequency signal processing unit and the ultrasonic signal processing unit are electrically connected with the data processing unit; the data processing unit is electrically connected with a display unit.
2. The miniaturized routing inspection and positioning device according to claim 1, wherein: the device also has an energy storage unit for supplying power to each unit module.
3. The miniaturized routing inspection and positioning device according to claim 1, wherein: the ultrahigh frequency signal receiving unit comprises a No. 1 ultrahigh frequency signal receiving unit, a No. 2 ultrahigh frequency signal receiving unit and a No. 3 ultrahigh frequency signal receiving unit; the No. 1 ultrahigh frequency signal receiving unit, the No. 2 ultrahigh frequency signal receiving unit and the No. 3 ultrahigh frequency signal receiving unit are three same active ultrahigh frequency sensors and are used for collecting original ultrahigh frequency signals, filtering and amplifying the original signals and providing frequency band and gain selection;
the threshold triggering unit comprises a No. 1 ultrahigh frequency signal threshold triggering unit, a No. 2 ultrahigh frequency signal threshold triggering unit and a No. 3 ultrahigh frequency signal threshold triggering unit; the system comprises a number 1 ultrahigh frequency signal threshold triggering unit, a number 2 ultrahigh frequency signal threshold triggering unit and a number 3 ultrahigh frequency signal threshold triggering unit, wherein the number 1 ultrahigh frequency signal threshold triggering unit, the number 2 ultrahigh frequency signal threshold triggering unit and the number 3 ultrahigh frequency signal threshold triggering unit are used for detecting corresponding ultrahigh frequency signal thresholds and comparing the corresponding ultrahigh frequency signal thresholds with thresholds output by a threshold adjusting unit, and if the threshold of the corresponding ultrahigh frequency signal is detected to reach the threshold output by the threshold adjusting unit, a triggering signal is sent out;
the ultrahigh frequency signal processing unit comprises a No. 1 ultrahigh frequency signal processing unit, a No. 2 ultrahigh frequency signal processing unit and a No. 3 ultrahigh frequency signal processing unit;
the signal frequency input range of the 3 groups of ultrahigh frequency signal threshold triggering units at least needs to meet 300MHz-3 GHz.
4. The miniaturized routing inspection and positioning device according to claim 1, wherein: the ultrahigh frequency signal threshold trigger unit circuit comprises resistors R1, R2 and R3, capacitors C1, C2, C3, C4 and C5, chips U41, U42 and U3, filters F1, F2, F3 and F4;
in a chip U41, a pin J1 is connected with a pin 1 of a filter F1, pins 2, 7, 8, 10 and 12 are grounded, a pin J3 is connected with a pin 1 of a filter F3, and pins 4 and 5 are respectively connected with high-frequency voltage signals V1 and V2; the pin 6 is connected with a power supply voltage of 3.3V, the pin 9 is connected with a pin J1 of a chip U42 through a resistor R1, pins 4 and 5 are respectively connected with high-frequency voltage signals V1 and V2 in the chip U42, the pin 6 is connected with a power supply V3V, pins 2, 7 and 8 are grounded, the pin 3 is connected with a filter F4, and the pin 9 is connected with a filter F2; one path of the output end of the pin 11 is grounded through a resistor R2, and the other path of the output end of the pin is filtered through a capacitor C2 and then sends an ultrahigh frequency signal to a chip U3; the chip U3 is grounded through a resistor R3 and a capacitor C3 which are connected in series, and is output to the time difference measuring unit through a Q1, and a DA1 signal is connected as a threshold output signal of the threshold adjusting unit;
the signal processing unit of the No. 1 ultrahigh frequency, the signal processing unit of the No. 2 ultrahigh frequency and the signal processing unit of the No. 3 ultrahigh frequency are used for amplifying, filtering and detecting the signals received by the signal receiving unit of the No. 1 ultrahigh frequency, the signal receiving unit of the No. 2 ultrahigh frequency and the signal receiving unit of the No. 3 ultrahigh frequency respectively.
5. The miniaturized routing inspection and positioning device according to claim 1, wherein: the ultrasonic signal processing unit is used for processing the signals received by the ultrasonic signal receiving unit and processing the signals; the threshold adjusting unit is used for providing different thresholds for the ultrahigh frequency signal threshold triggering unit so as to enable the ultrahigh frequency signal threshold triggering unit to reach a triggering condition;
the time difference measuring unit is used for measuring the time difference of the trigger signals sent by the adjacent ultrahigh frequency signal threshold triggering units;
the time difference measuring unit circuit comprises resistors R5, R6, R7, R9, R12, R13 and R15, capacitors C12 and C13, crystal oscillators X1 and X2, and chips U4 and U6;
in the chip U4, a resistor R9 is electrically connected between pins 1 and 2 and pins 3 and1 of a crystal oscillator X1 are respectively connected; in the chip U4, pins 1 and 2 are grounded through capacitors C6 and C7 respectively; a resistor R15, a crystal oscillator X2 and capacitors C12 and C13 which are connected in series are respectively connected between the pins 15 and 16; the pin 17 is connected with the pin 4 of the chip U6 through a resistor R12, connected with the pin 2 of the chip U6 through a resistor R13, and connected with the pin 2 of the chip U6 through a pin 18; the pin 32 is connected with an enabling signal through a resistor R5, and resistors R6 and R7 are connected between the pins 25 and 26 in series; the pin 31 is connected with a threshold trigger signal Q1 of the chip U3, and the pin 32 is connected with a trigger signal Q2 of an adjacent ultrahigh frequency threshold trigger unit;
x1 and X2 are two crystal oscillators, X1 is a high-speed oscillator which provides a high-speed clock unit for the U4 chip to calibrate, and X2 is a 32.768kHz oscillator which is used as a reference clock to control the high-speed clock to vibrate and perform clock calibration. The chips U6, R12 and R13 form a Schmitt trigger, R5, R6 and R7 are used for enabling U4, so that a pin 31Q 1 and a pin 32Q 2 of the U4 can receive trigger signals sent by two ultrahigh frequency signal threshold trigger units, and picosecond-level precision is provided. When the two trigger signals are received, the chip U4 automatically detects the time difference of the two trigger signals according to the clock signal and transmits the time difference information to the data processing unit.
6. The miniaturized routing inspection and positioning device according to claim 1, wherein: and the data processing unit is used for processing the three paths of ultrahigh frequency and one path of ultrasonic signal data and the time data of the time difference measuring unit and storing the data.
7. The miniaturized routing inspection and positioning device according to claim 1, wherein: and the display unit is used for displaying three paths of ultrahigh frequencies, various related maps or map combinations such as waveform and amplitude of one path of ultrasound and partial discharge positioning information.
8. The miniaturized routing inspection and positioning device according to claim 1, wherein:
the energy storage unit is a high-performance lithium battery and is used for providing power for the energy storage device, so that the energy storage device has longer service time.
9. The miniaturized routing inspection positioning device for partial discharge according to claim 1, wherein: the device comprises a front shell (2) and a rear shell (8) which are buckled to form an outer shell; an inter-board connecting unit (4) is installed in the outer shell, a data display unit (3) exposed through the front shell (2) is installed on the inter-board connecting unit (4), and a key (1) is buckled on the data display unit (3); the inter-board connecting unit (4) is electrically connected with a data processing unit (5), a signal conditioning unit (6) and an energy storage unit (7);
a screen mounting opening (13) is formed in the front shell (2) and used for exposing the data display unit (3); a window used for exposing the keys (1) is arranged below the screen mounting port (13), and a clamping groove (14) is arranged at the lower part of the window and used for connecting the keys (1) with the inter-board connecting unit (4);
a plurality of front connecting posts (9) are arranged on the inner wall of the front shell (2), and a corresponding bottom connecting hole (22) is arranged on the rear shell (8), so that bolts can be inserted from the outer side surface of the bottom connecting hole (22) to be connected with a hollow screw hole of the front connecting post (9);
a clamping end foot groove (10) is formed in one corner of the upper end of the front shell (2), a concave end face (12) is formed in the upper end of the rear shell (8), and the concave end face (12) is arranged in a concave mode relative to the outer edges of the front shell (2) and the rear shell (8); the concave end surface (12) is provided with a plurality of through holes to expose the corresponding interface of the signal conditioning unit (6);
one corner of the concave end surface (12) is provided with a rear convex clamping tongue (11), and the rear convex clamping tongue (11) is inserted into the clamping end foot groove (10);
the back of the data display unit (3) is provided with a plurality of clamping pins (15), and the inter-board connecting unit (4) is provided with a bayonet (16) clamped with the clamping pins (15);
a plurality of positioning through holes (17) and side clamping grooves (18) are distributed on the inter-board connecting unit (4); the positioning through hole (17) is used for penetrating through a bolt connected with the front connecting column (9);
the data processing unit (5) is provided with a plug socket (19) for being plugged with the corresponding interface of the inter-board connecting unit (4);
an ear hole (20) penetrating through a bolt connected with the front connecting column (9) is arranged on the signal conditioning unit (6), a positioning hole column (21) is arranged on the signal conditioning unit (6), and a positioning pin (25) connected with the positioning hole column (21) is arranged on the data processing unit (5);
a charging interface (23) and a positioning groove (24) are arranged on the lower wall of the rear shell (8);
the signal conditioning unit (6) is internally provided with an ultrahigh frequency signal processing module, an ultrasonic signal processing module and a filtering and amplifying module, wherein the input end of the filtering and amplifying module is electrically connected with the output end of the ultrahigh frequency signal processing module and the output end of the ultrasonic signal processing module respectively; a signal input terminal of the signal conditioning unit (6) is used as a coaxial cable input end, the input of the ultrahigh frequency signal processing module is connected with a plurality of active ultrahigh frequency sensors, and the input of the ultrasonic signal processing module is connected with a passive ultrasonic sensor;
the signal conditioning unit (6) is internally provided with an ultrahigh frequency signal processing module, an ultrasonic signal processing module and a filtering and amplifying module, wherein the input end of the filtering and amplifying module is electrically connected with the output end of the ultrahigh frequency signal processing module and the output end of the ultrasonic signal processing module respectively; a signal input terminal of the signal conditioning unit (6) is used as a coaxial cable input end, the input of the ultrahigh frequency signal processing module is connected with a plurality of active ultrahigh frequency sensors, and the input of the ultrasonic signal processing module is connected with a passive ultrasonic sensor; the filtering and amplifying module comprises an ultrahigh frequency signal filtering circuit electrically connected with the ultrahigh frequency signal processing module and an ultrasonic signal filtering circuit electrically connected with the ultrasonic signal processing module; the output end of the signal conditioning unit (6) is electrically connected with the input end of the data processing unit (5) so as to transmit the partial discharge information and the time difference information; the signal conditioning unit (6) is electrically connected with the data display unit (3);
the signal conditioning unit (6) receives and processes a plurality of ultrahigh frequency signals and1 path of ultrasonic signals simultaneously through a coaxial cable, filters, amplifies and detects the signals, calculates the arrival time difference of two adjacent paths of ultrahigh frequency signals, and transmits the signals to the data processing unit (5), wherein a plurality of filtering frequency bands of the ultrahigh frequency signals comprise three frequency band ranges of a low frequency band, a high frequency band and a full frequency band; the 1-path ultrasound comprises two frequency band ranges of 10KHz-80KHz and 80KHz-200 KHz; the ultrasonic signal filter circuit comprises analog switches U1 and U2 serving as frequency band selection switches, capacitors C14, C24, C34, C44, C54, C6-C10, inductors L1-L10 and resistors R14 and R24;
the ultrasonic signal acquisition device comprises analog switches U1 and U2, capacitors C14, C24, C34, C44, C54, C6-C10, inductors L1-L5 and a resistor R14 which jointly form an 80KHz-200KHz frequency band for acquiring ultrasonic signals; capacitors C6, C7, C8, C9, C10, inductors L6, L7, L8, L9, L10 and a resistor R24 jointly form a frequency band of 10KHz-80KHz of ultrasonic signals;
capacitors C14, C24, C34, C44, C54, C6-C10, inductors L1-L5 and a resistor R14 form a first filtering unit; the capacitors C6-C10, the inductors L6-L10 and the resistor R24 form a second filtering unit;
in the analog switch U1, a pin 5 is grounded, a pin 4 is grounded at-5V and is grounded through a corresponding capacitor, a pin 13 is grounded at +5V and is grounded through a corresponding capacitor, and pins 1 and 16 are respectively connected with corresponding ultrasonic signals;
in the analog switch U2, pin 3 and pin 14 are respectively connected to the corresponding first filter unit and second filter unit; the pins 1 and 16 are respectively connected with the data processing unit (5) through channels BAND1 and BAND 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210572568.5A CN114910759A (en) | 2022-05-25 | 2022-05-25 | Miniaturized partial discharge inspection positioning method and device |
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| CN202210572568.5A CN114910759A (en) | 2022-05-25 | 2022-05-25 | Miniaturized partial discharge inspection positioning method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117220183A (en) * | 2023-11-09 | 2023-12-12 | 沈阳华德海泰电器有限公司 | Inflatable quick grounding switch |
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2022
- 2022-05-25 CN CN202210572568.5A patent/CN114910759A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117220183A (en) * | 2023-11-09 | 2023-12-12 | 沈阳华德海泰电器有限公司 | Inflatable quick grounding switch |
| CN117220183B (en) * | 2023-11-09 | 2024-01-26 | 沈阳华德海泰电器有限公司 | Inflatable quick grounding switch |
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