CN207215937U - A kind of AC and DC insulation fault location system - Google Patents
A kind of AC and DC insulation fault location system Download PDFInfo
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- CN207215937U CN207215937U CN201721008943.4U CN201721008943U CN207215937U CN 207215937 U CN207215937 U CN 207215937U CN 201721008943 U CN201721008943 U CN 201721008943U CN 207215937 U CN207215937 U CN 207215937U
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Abstract
The utility model discloses a kind of AC and DC insulation fault location system, including main body instrument and detection probe；Main body instrument includes signal behavior processing module, data processing module, human-computer interaction module and synchronization signal detection module；Detection probe is the jaw type detection probe for the earth point that movement comes on detection branches bus；Detection probe signal is sent to A/D conversion chips by signal behavior processing module；Data processing module includes A/D conversion chips and single-chip microcomputer；Human-computer interaction module includes display, keyboard and warning circuit；The extraction of synchronization signal detection module is fed to the low frequency signal on system under test (SUT), and converts it to synchronizing signal；The control module of control selections detection signal is connected with single-chip microcomputer.The utility model can solve to be used for direct current or AC system, can be used cooperatively trouble-shooting point with single signal generator, can also coordinate the technical problem such as on-line measuring device, trouble-shooting point.
Description
Technical field
A kind of safety detection technology of power system is the utility model is related to, more particularly to a kind of insulation event of AC and DC
Hinder alignment system.
Background technology
With the rapid development of social economy, production and life are increasing to the demand of electric power, to power supply quality
It is required that also more and more high, this requires power department to ensure that power system security is reliably run.It is tight that once insulation occurs for system
Decline situation again, do not require nothing more than the accurate branch road found out insulation and declined, and requirement can find out insulation in the case where not powering off
Decline trouble point.With the development and application of sensing technology, numerical analysis technique and computer technology, insulation fault inline diagnosis
Technology and location technology are developed rapidly, and such as domestic each manufacturer's production is applied to having for straight-flow system：Straight-flow system
Insulation tester, straight-flow system insulation fault location instrument etc.；Suitable for having for AC system：AC system insulation tester is (such as
JLJD-A AC systems grounding detector).Positioning for fault in ac transmission system point, it is domestic at present not have manufacturer production correlation
There are the EDS3090 Portable insulation fault location systems of German BENDER productions in equipment, foreign countries, but because its price is high, detection
Sensitivity is low and the reason such as anticapacitance ability is not promoted the use of in China.
The content of the invention
The purpose of this utility model is to provide a kind of AC and DC insulation fault location system, straight to solve to be used for
Streaming system, it can also be used to the earth-free AC system of single-phase or three-phase；Can be with single signal generator with the use of searching
Trouble point, on-line measuring device can also be coordinated, such as be asked using the technology such as detection means, trouble-shooting point of low-frequency ac method
Topic.
In order to realize foregoing invention purpose, technical scheme is as follows used by the utility model：
A kind of AC and DC insulation fault location system, including main body instrument and detection probe；Main body instrument selects including signal
Select processing module, data processing module, human-computer interaction module and synchronization signal detection module；Detection probe is mobile to detect point
The jaw type detection probe of earth point on branch bus；Signal behavior processing module includes signal selecting circuit, cascade bandpass filtering
Circuit, phase locking circuit, selection card is tested the detection probe signal of branch road by it current, and signal is passed through into cascade filtering
Circuit, phase-comparison circuit, then it is sent to A/D conversion chips；Data processing module includes A/D conversion chips and calculates system under test (SUT)
Insulation situation and in a manner of resistance value output alarm signal single-chip microcomputer；Show that the operation conditions of system under test (SUT), key entry are set
Putting parameter and providing the human-computer interaction module alarmed includes display, keyboard and warning circuit；The inspection of synchronization signal detection module
The low frequency signal that end extraction is fed on system under test (SUT) is surveyed, and converts it to synchronizing signal, output end is handled with signal behavior
Module connects.
The cascade bandwidth-limited circuit is to be cascaded two groups of bandwidth-limited circuits, and the level for forming quadravalence filtering is associated
Bandpass filter circuit.
The advantages of the utility model and good effect are as follows：
1st, relative to online insulation tester, this alignment system is to be moved according to pincerlike formula detection probe come detection branches
Earth point on bus, so as to accurately determine earth point.
2nd, to overcome the power frequency and harmonic wave interference of bus-bar system, alignment system wrong report disorderly report is prevented, in signal acquisition circuit
In we original one-level bandwidth-limited circuit is changed to be cascaded two groups of bandwidth-limited circuits, form 4 ranks filtering level
Associated bandpass filter circuit, more effectively eliminate the interference of power frequency and harmonic wave.
3rd, the interference because of caused by capacitive and inductive load is overcome by the effect of synchronizing signal.Synchronization signal detection module
Function be the low frequency signal that is fed on system under test (SUT) of extraction and convert it to synchronizing signal, can so save signal production
Wire between raw circuit part and alignment system connects, and facilitates the traverse measurement of alignment system.
Brief description of the drawings
Fig. 1 is application schematic diagram of the utility model in straight-flow system or one-phase AC-system.
Fig. 2 is application schematic diagram of the utility model in three-phase alternating current system.
Embodiment
The utility model is made up of main body instrument with detection probe.Main body instrument is by signal behavior processing module, data
Manage module, human-computer interaction module and synchronization signal detection module composition.Data processing module is core of the present utility model,
Its function is selection, received and the detection signal of processing detection probe, and the module is by 16 A/D conversion chips and 32
STM32 series monolithics form.The detection signal received is converted into data signal and gives CPU by A/D conversion chips, CPU
Receive change data and handled, calculate the insulation situation of system under test (SUT) and shown in a manner of resistance value, if tested
System insulation drops to below the threshold value of setting, then the system sends audio alert and display system grounding resistance.Signal
Selection processing module is made up of circuits such as signal behavior, cascade bandpass filtering, Phase synchronizations, and its effect is selection card current
The detection probe signal of tested branch road, and signal is sent to A/D again by circuits such as cascade filtering, phase bit comparisons.Wherein signal
Selection circuit is exactly a simulation gate circuit, is the jaw type detection probe for being located at multiple diverse locations by CPU control selections
In some to induction signal.The function of human-computer interaction module is to show the operation conditions of system under test (SUT), key in arrange parameter and carry
For audio alert.The function of synchronization signal detection module is the low frequency signal that extraction is fed on system under test (SUT) and converted it to
Synchronizing signal, overcome influence of the distribution capacity to calculating on bus.
Operation principle of the present utility model is referring to shown in Fig. 1,2.Detection probe is stuck in behind low-frequency signal injection point, along the line
It is moved rearwards, searches earth fault.If there is earth fault in the line inspection, the ultralow frequency letter that at this moment ultra-low frequency signal source is sent
Number electric current, flow through and current loop is formed by line inspection road, grounding resistance and distribution capacity.The detection probe being stuck on tested branch line
Middle generation induced-current, the reactance that faradic size is formed with grounding resistance and electric capacity are inversely proportional, and resistance is small or electric capacity is big,
Induced-current is with regard to big caused by detection probe.The induced-current is amplified, and cascade bandpass filtering, Phase synchronization, A/D conversions are sent again
CPU carries out digital processing, and CPU obtains grounding resistance and ground connection distributed capacitance, and send human-computer interaction module to show.Connect when tested
When ground resistance is less than thresholding arranges value, CPU has found audio alert signal and lights trouble lamp, determines earth fault position
Put.
It is of the present utility model to embody several aspects below relative to prior art reformed AHP point：
1st, relative to online insulation tester, this alignment system is to be moved according to pincerlike formula detection probe come detection branches
Earth point on bus.Due to being on-line checking, supporting sensor is usually fixed installation with online insulation tester
Between bus and each branch road fuse, when having ground connection on a certain branch road, electrification is had on the sensor of the branch road
Miscarriage life, signal acquisition module judge the size of grounding resistance according to the inducing current size on sensor, then will calculate number
According to giving main frame.Because the wiring of branch bar may draw very long, even if manually also being difficult to find earth point.It is basic herein
It is upper that we detect earth point using pincerlike formula detection probe.As shown in Figure 1：When having ground connection on the branch road of detection probe card,
Detection probe by from a points along arrow side move when, alignment system can tell operating personnel to have ground connection with sound and light alarm always, work as shifting
When moving b, alarm disappears, represent earth point just above the b points near, so that it is determined that earth point.
2nd, to overcome the power frequency and harmonic wave interference of bus-bar system, alignment system wrong report disorderly report is prevented, in signal acquisition circuit
In we by original one-level bandwidth-limited circuit, (JLJD-A AC system grounding detectors use in signal acquisition circuit
Circuit) it is changed to be cascaded two groups of bandwidth-limited circuits, the cascade bandwidth-limited circuit of 4 ranks filtering is formed, is more effectively disappeared
Except the interference of power frequency and harmonic wave.
3rd, the effect of synchronizing signal is to overcome the interference because of caused by capacitive and inductive load.As shown in Figure 1：Work as branch path
On when having purely capacitive ground connection, the signal of detection probe sensing when pure resistance compared to being advanced 90 degree, signal during pure inductance ground connection
Then quadrature lagging, it can be eliminated using the synchronous effect of signal and cause alignment system to be reported by mistake because of distribution capacity.My company produces
JLJD-A AC system grounding detectors in synchronizing signal be as caused by signal generating circuit, main frame must pass through wire will
Synchronizing signal is connected to each letter acquisition module.Wire draws long, easily causes synchronizing signal exhaustion, letter acquisition module is worked
It is abnormal, cause wrong report.In this alignment system the function of synchronization signal detection module be extraction be fed to it is low on system under test (SUT)
Frequency signal simultaneously converts it to synchronizing signal, and the wire that can so save between signal generating circuit part and alignment system connects
Connect, facilitate the traverse measurement of alignment system.
Claims (2)
1. a kind of AC and DC insulation fault location system, including main body instrument and detection probe；Main body instrument includes signal behavior
Processing module, data processing module, human-computer interaction module and synchronization signal detection module；Characterized in that, detection probe is to move
Move the jaw type detection probe of the earth point come on detection branches bus；Signal behavior processing module includes signal selecting circuit, level
Associated bandpass filter circuit, phase locking circuit, selection card is tested the detection probe signal of branch road by it current, and signal is passed through
Cascade filtering circuit, phase-comparison circuit are crossed, then is sent to A/D conversion chips；Data processing module includes A/D conversion chips and meter
Calculate system under test (SUT) insulation situation and in a manner of resistance value output alarm signal single-chip microcomputer；Show the operation shape of system under test (SUT)
The human-computer interaction module of condition, key entry arrange parameter and offer alarm includes display, keyboard and warning circuit；Synchronization signal detection
The test side extraction of module is fed to the low frequency signal on system under test (SUT), and converts it to synchronizing signal, output end and signal
Select processing module connection.
A kind of 2. AC and DC insulation fault location system according to claim 1, it is characterised in that the cascade band logical
Filter circuit is to be cascaded two groups of bandwidth-limited circuits, forms the cascade bandwidth-limited circuit of quadravalence filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721008943.4U CN207215937U (en) | 2017-08-14 | 2017-08-14 | A kind of AC and DC insulation fault location system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721008943.4U CN207215937U (en) | 2017-08-14 | 2017-08-14 | A kind of AC and DC insulation fault location system |
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| CN207215937U true CN207215937U (en) | 2018-04-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247211A (en) * | 2017-08-14 | 2017-10-13 | 浙江省星炬科技有限公司 | A kind of AC and DC insulation fault location system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247211A (en) * | 2017-08-14 | 2017-10-13 | 浙江省星炬科技有限公司 | A kind of AC and DC insulation fault location system |
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