CN209117794U - A kind of leak current fault detector based on magnetic field signal analysis - Google Patents
A kind of leak current fault detector based on magnetic field signal analysis Download PDFInfo
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- CN209117794U CN209117794U CN201920459469.XU CN201920459469U CN209117794U CN 209117794 U CN209117794 U CN 209117794U CN 201920459469 U CN201920459469 U CN 201920459469U CN 209117794 U CN209117794 U CN 209117794U
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- magnetic field
- leak current
- current fault
- fault detector
- signal
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to electrical equipment technical fields; more particularly to a kind of leak current fault detector based on magnetic field signal analysis for line-to-ground leak current fault; after leak current fault occurs for line facility; earth leakage protective device tripping; open leak current fault detector; detect ambient magnetic field environment, calibrator (-ter) unit threshold value；It is respectively connected to each phase conductor, is changed using leak current fault detector detection magnetic field environment, determines electric leakage conducting wire；It is tracked along electric leakage wire magnetic fields using instrument, when magnetic field strength of leaking electricity is reduced rapidly, leakage detector probe present position is leakage point of electricity.The utility model has the beneficial effects that the leak current fault detector based on magnetic field signal analysis is that the leakage current magnetic field signal in solid conductor is received and analyzed, the sensitivity of equipment is increased substantially with accuracy, signal is received to antenna and has carried out further spectrum analysis and digital operation, make operator more accurate to the positioning of fault point, it is relatively reliable.
Description
Technical field
The utility model relates to electrical equipment technical field more particularly to it is a kind of for line-to-ground leak current fault based on
The leak current fault detector of magnetic field signal analysis.
Background technique
In China's power supply system, the specific gravity that power distribution network is put is very big, and power distribution network is widely distributed, and wiring is complicated, branch
Lu Duo, the probability that ground fault occurs for power distribution network is very high, can account for the 80% of total failare, because of power-off condition caused by ground fault
It is widely present.Simultaneously because the technical force of operation of power networks electrician is limited, after earth leakage failure occurs, can not really look into
It finds earth leakage fault point or troubleshooting time is longer, power transmission cannot be restored in time, made to production, the life of numerous people
At large effect, the safety for also affecting power supply system is operated normally.
Traditional earth leakage trouble shoot is looked by the methods of artificial line walking, the power failure test of drawing road or another plus input signal
Earth leakage fault point is looked for, working efficiency is low, searches purposelessly, not can guarantee power grid security reliability service, some lookup sides
Method needs to have a power failure in search procedure, influences other client's normal electricity consumptions, and lookup method is not scientific.
Application No. is one kind that the patent of invention of 201310651398.0 and 201310651311.X designs for the applicant
Contactless leak current fault detector and detection method, detection method are that the out-of-balance current of route is judged and divided
Analysis, load current interference signal is excessive, and instrument is detected only with signal amplitude size, and the gain of circuit is excessively high to be had
Imitate exclusive PCR；Equipment needs to carry out manual adjustment gain knob when in use, is not easy to calibrate.In use, applicant
It was found that the method detection be two or two or more current in wire remnant field, theoretically conducting wire parallel lay-up can be examined
It measures, actually parallel also only opposite, load current is very big to remnant field interference, and accuracy rate is very low, so in reality
Load current must be broken when use, exclusive PCR is difficult to calibrate surrounding magnetic field only with manual adjustment gain knob,
It must reinforce the analysis and digital operation to signal, filtering interference signals calibrate equipment by the way of given threshold.
Therefore, it is particularly important that a kind of accuracy, the higher leak current fault detection device of reliability can be designed.
Summary of the invention
The purpose of this utility model is in order to reduce the lookup difficulty after earth leakage failure occurs for power grid, in the shortest time
Interior debugging point, it is ensured that the reliable and stable operation of power grid security, and a kind of leak current fault based on magnetic field signal analysis proposed
Detector has a power failure to circuit, to the current signal of solid conductor injection electric leakage, accuracy, high reliablity.To electric leakage magnetic field
Signal has carried out digital operation and spectrum analysis calibrates equipment by way of given threshold.
To achieve the goals above, the utility model adopts the technical scheme that
A kind of leak current fault detector based on magnetic field signal analysis for realizing the above method, including signal receiving antenna,
Signal analysis and processing device, output indicating device and shell support, it is characterised in that:
The signal receiving antenna is made of magnetic field coupling antenna with gain circuitry, for directional reception electric leakage magnetic field letter
Number；
The signal analysis and processing device is by AD analog to digital conversion circuit, CPU processor, power-supplying circuit, output instruction electricity
Road is constituted, and the magnetic field signal for receiving to signal receiving antenna carries out digital filtering and spectrum analysis, according to surrounding magnetic field
Environmental change situation exports corresponding sound, diagram, alarm and digital prompt；
The output indicating device includes buzzer and touch LCD display, and the buzzer is mentioned for audible alarm
Show, the touch LCD display is prompted for alarm lamp prompt, histogram prompt, numerical value, ambient enviroment magnetic field signal is calibrated,
Threshold value setting；
Shell support includes portion of the handle and Module of aerial, and portion of the handle includes hand bionic handle, rotatable
Touch LCD display watch window, main casting frame.
Further, in order to preferably realize the utility model, the signal receiving antenna is by multiturn enameled wire and high magnetic
Conductance magnetic core framework and gain circuitry form, and signal receiving antenna and conducting wire are laid out at an angle of 90 degrees when use, and directional reception is to be measured
The magnetic field that alternating current is formed in conducting wire.
Further, in order to preferably realize the utility model, the signal analysis and processing device is using ARM Cortex
32 digit flash memory microcontrollers of 3 processor cores of M receive signal to antenna and carry out digital operation and spectrum analysis, and root
Intelligent alarm output and instruction are made according to the requirement that operator sets.
Further, in order to preferably realize the utility model, the output indicating device uses touch display screen, with more
Group histogram shows the signal strength of different frequency, and is equipped with numerical value, when signal strength is more than given threshold, alarm lamp
Prompt, buzzer warning, liquid crystal display directly displays the magnetic field environment value of ambient enviroment after booting, instructs operator according to surrounding
Environment set threshold value.
Further, in order to preferably realize that the utility model, the portion of the handle are additionally provided with charger interface, program liter
Grade interface and switch；Wiring board is equipped in the main casting frame, wiring board is equipped with slot, analog to digital conversion circuit and centre
Device is managed, is wiring board power supply by lithium battery.
A method of use it is above-mentioned based on magnetic field signal analysis leak current fault detector, which is characterized in that including with
Lower step
S1, after leak current fault occurs for line facility, leak current fault detector, detection surrounding are opened in earth leakage protective device tripping
Magnetic field environment determines device threshold；
S2 is respectively connected to each phase conductor, detects wire magnetic fields environmental change situation using leak current fault detector, determines leakage
Electric lead；
S3 tracks to electric leakage wire magnetic fields, when magnetic field strength of leaking electricity is reduced rapidly, locating for leakage detector probe
Position is leakage point of electricity.
Further, in order to preferably realize the present invention, the concrete operation method of the step 2 are as follows:
The power supply for connecting leak current fault phase conductor, just produces a ring centered on conducting wire around leak current fault phase
Shape is leaked electricity magnetic field, and stronger closer to wire center magnetic field strength, conductor laying path is in magnetic field signal maximum and antenna direction
Vertically, leak current fault detector can be oriented reception to the magnetic field, by electric leakage changes of magnetic field situation track with
Determine whether, it is final to determine leak current fault point and thread guide path.
The utility model has the following beneficial effects:
Leak current fault detector based on magnetic field signal analysis is carried out to the leakage current magnetic field signal in solid conductor
It receives and analysis, sensitivity and the accuracy of equipment increases substantially, signal is received to antenna and has carried out further frequency spectrum point
Analysis and digital operation, make operator more accurate to the positioning of fault point.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the leak current fault detector based on magnetic field signal analysis of the utility model；
Fig. 2 is the use functional block diagram of the leak current fault detector based on magnetic field signal analysis of the utility model.
Fig. 3 is the conducting wire electric leakage magnetic field schematic diagram of the utility model.
In figure: 1, signal receiving antenna, 101, Module of aerial, 2, rotatable touch LCD display watch window, 3,
Subjective and Objective frame, 4, hand bionic handle.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing to this
The specific embodiment of utility model is described in detail.Many details are explained in the following description in order to abundant
Understand the utility model.But the utility model can be implemented with being much different from other way described herein, this field
Technical staff can do similar improvement without prejudice to the utility model connotation, therefore the utility model is not by following public affairs
The limitation for the specific implementation opened.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein includes
Any and all combinations of one or more related listed items.
Fig. 1 and Fig. 2 and Fig. 3 is a kind of specific embodiment of the utility model, which specifically includes that signal receives
Antenna, signal analysis and processing device, output indicating device, shell support four parts；
The signal receiving antenna is to be made of magnetic field coupling antenna with gain circuitry, the signal analysis and processing device be by
AD analog to digital conversion circuit, CPU processor, power-supplying circuit, output indicating circuit etc. are constituted；The output indicating device includes
Audible alarm prompt, alarm lamp signal prompt, column diagram prompt, numerical value prompt, ambient enviroment magnetic field signal calibration etc..The shell
Body supporting mechanism includes portion of the handle and antenna support section；The utility model can be with by carrying out spectrum analysis to electric leakage signal
Interference signal is effectively removed, ancillary staff quickly determines earth leakage fault point.
The present embodiment track quickly really using the leakage current change of magnetic field strength situation that route solid conductor is formed
Determine the lookup method of position of failure point.I.e. after leak current fault occurs for equipment, and earth leakage protective device is caused to trip, non-electric leakage phase is disconnected
Conducting wire, connect electric leakage phase conducting wire, thus electric leakage phase conducting wire around form one and leakage current size
Equal electric leakage magnetic field tracks to electric leakage magnetic field by the instrument, to find leak current fault point.
The present embodiment is equally applicable to other places for needing to change according to magnetic field signal discriminatory analysis failure or accident, example
Such as determine whether electric load, mobile phone is whether there is or not communication, and whether there is or not the detections such as transmission for signal.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art is within the technical scope disclosed by the utility model, practical according to this
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (5)
1. a kind of leak current fault detector based on magnetic field signal analysis, including signal receiving antenna (1), signal analysis and processing
Device, output indicating device and shell support, it is characterised in that:
The signal receiving antenna (1) is made of magnetic field coupling antenna with gain circuitry, for directional reception electric leakage magnetic field signal；
The signal analysis and processing device is made of AD analog to digital conversion circuit, CPU processor, power-supplying circuit, output indicating circuit, is used
Digital filtering, operation and spectrum analysis are carried out in the magnetic field signal received to signal receiving antenna (1), according to surrounding magnetic field ring
Border situation of change exports corresponding sound, diagram, alarm and digital prompt；
The output indicating device includes buzzer and touch LCD display, and the buzzer is prompted for audible alarm, institute
Touch LCD display is stated for alarm lamp prompt, histogram prompt, numerical value prompt, the calibration of ambient enviroment magnetic field signal, threshold value
Setting；
Shell support includes portion of the handle and Module of aerial (101), and portion of the handle includes hand bionic handle (4), can
Rotate touch LCD display watch window (2), main casting frame (3).
2. the leak current fault detector according to claim 1 based on magnetic field signal analysis, it is characterised in that: the signal
Receiving antenna is made of multiturn enameled wire and high permeability magnetic core skeleton with gain circuitry, signal receiving antenna and conducting wire when use
It is laid out at an angle of 90 degrees, the magnetic field that alternating current is formed in directional reception conducting wire to be measured.
3. the leak current fault detector according to claim 1 based on magnetic field signal analysis, it is characterised in that: the signal
Analysis processor uses 32 digit flash memory microcontrollers of 3 processor cores of ARM Cortex M, receives signal to antenna
Digital operation and spectrum analysis are carried out, and intelligent alarm output and instruction are made according to the requirement that operator sets.
4. the leak current fault detector according to claim 1 based on magnetic field signal analysis, it is characterised in that: the output
Instruction device uses touch display screen, and the signal strength of different frequency is shown with multiple groups histogram, and is equipped with numerical value, works as letter
When number intensity is more than given threshold, alarm lamp prompt, buzzer warning, liquid crystal display directly displays the magnetic field of ambient enviroment after booting
Environment value instructs operator according to ambient enviroment given threshold.
5. the leak current fault detector according to claim 1 based on magnetic field signal analysis, it is characterised in that: described hand-held
Part is additionally provided with charger interface, program upgrade interface and switch；It is equipped with wiring board in the main casting frame, is set on wiring board
There are slot, analog to digital conversion circuit and central processing unit, is wiring board power supply by lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920459469.XU CN209117794U (en) | 2019-04-08 | 2019-04-08 | A kind of leak current fault detector based on magnetic field signal analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920459469.XU CN209117794U (en) | 2019-04-08 | 2019-04-08 | A kind of leak current fault detector based on magnetic field signal analysis |
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| Publication Number | Publication Date |
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| CN209117794U true CN209117794U (en) | 2019-07-16 |
Family
ID=67209439
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920459469.XU Expired - Fee Related CN209117794U (en) | 2019-04-08 | 2019-04-08 | A kind of leak current fault detector based on magnetic field signal analysis |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946558A (en) * | 2019-04-08 | 2019-06-28 | 国网山东省电力公司夏津县供电公司 | A kind of leak current fault detector and its application method based on magnetic field signal analysis |
| CN110095716A (en) * | 2019-05-21 | 2019-08-06 | 国网山西省电力公司电力科学研究院 | High-voltage switch gear characteristic non-contact testing system and test method based on radiofrequency signal feature |
| CN112858838A (en) * | 2021-01-22 | 2021-05-28 | 广东电网有限责任公司 | Cable fault positioning system and method |
-
2019
- 2019-04-08 CN CN201920459469.XU patent/CN209117794U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946558A (en) * | 2019-04-08 | 2019-06-28 | 国网山东省电力公司夏津县供电公司 | A kind of leak current fault detector and its application method based on magnetic field signal analysis |
| CN109946558B (en) * | 2019-04-08 | 2024-03-26 | 国网山东省电力公司夏津县供电公司 | Leakage fault detector based on magnetic field signal analysis and use method thereof |
| CN110095716A (en) * | 2019-05-21 | 2019-08-06 | 国网山西省电力公司电力科学研究院 | High-voltage switch gear characteristic non-contact testing system and test method based on radiofrequency signal feature |
| CN112858838A (en) * | 2021-01-22 | 2021-05-28 | 广东电网有限责任公司 | Cable fault positioning system and method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190716 |