CN110007231A - Series direct current arc method for measuring in brush direct current motor electric loop - Google Patents
Series direct current arc method for measuring in brush direct current motor electric loop Download PDFInfo
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- CN110007231A CN110007231A CN201910371744.7A CN201910371744A CN110007231A CN 110007231 A CN110007231 A CN 110007231A CN 201910371744 A CN201910371744 A CN 201910371744A CN 110007231 A CN110007231 A CN 110007231A
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- direct current
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- current
- brush
- fdrequency component
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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
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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
- G01R31/34—Testing dynamo-electric machines
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses series direct current arc method for measuring in a kind of brush direct current motor electric loop, are connected in parallel with a capacitor at the brush direct current motor both ends for generating interference high fdrequency component, filter out a part interference high fdrequency component；Inductance of connecting in the circuit between the brush direct current motor and series direct current arc fault detection current probe of high fdrequency component is interfered generation, the high fdrequency component for preventing electrical equipment from generating flows through series direct current arc fault detection current probe.Current probe is used to measure DC output side measure loop capacitance current.By the electric current that measures on detection current probe, and Time-Frequency Analysis is carried out to electric current, generation of the series direct current arc fault in DC loop may determine that according to the increase of electric current amplitude in a frequency domain.The present invention, because brush direct current motor bring interference high-frequency signal filters out, can will prevent the influence of the interference high-frequency signal for series direct current arc-detection in arc fault detection circuit.
Description
Technical field
The invention belongs to electrical engineering field, be related to the series direct current electric arc in a kind of brush direct current motor electrical system therefore
Hinder detection method.
Background technique
With the further development of modern industry, direct current system is widely used in such as aerospace, electric car neck
Domain.In direct current system, because of the reasons such as joint looseness and cable aging, it may appear that series direct current arc fault.Due to direct current
Flow no zero crossing, it, will not natural blow-out after series direct current arc fault generates, it is easier to cause the danger such as fire.
When series direct current arc fault generates in direct current system, it is equivalent to one nonlinear resistance of series connection in systems,
Meeting is so that DC current amplitude reduces in system, and has high fdrequency component generation with series direct current arc fault.Series direct current
The mode that predominantly detects of arc fault is to change indirect detection mode by the time domain variation of measure loop electric current and frequency domain amplitude.
Loop current, and then the frequency domain in analysis circuit electric current are measured using current probe, extracts fault characteristic band, with feature frequency
The variation of specific frequency amplitude carrys out the generation of characterization failure in band.The series direct current arc current that Y.S.Oh et al. obtains emulation
The decomposition of wavelet character value, and the parameter characterized by obtained wavelet details coefficient and wavelet approximation coefficients are carried out, to the string of generation
Connection direct-current arc is detected, but this method lacks actual experimental verification, and it is still necessary to further study for accuracy.
But since high-frequency current can be generated in electric loop when brush direct current motor works normally, the normal high-frequency current
The series direct current arc fault detection based on time-frequency domain characteristic can be interfered, the prior art can not be directly applied for having DC brush
In the direct current system of motor.For series direct current arc fault present in the direct current system with brush direct current motor, need
Series direct current arc method for measuring in the new brush direct current motor electric loop of one kind is provided.
Summary of the invention
In view of this, detecting series direct current in the direct current system with brush direct current motor the present invention is directed to invent a kind of
The method of electric arc.Also, the present invention can by arc fault detection circuit because brush direct current motor bring interference high frequency letter
It number filters out, prevents the influence of the interference high-frequency signal for series direct current arc-detection.
In order to achieve the above objectives, the invention provides the following technical scheme:
Series direct current arc method for measuring in brush direct current motor electric loop, which is characterized in that specific step is as follows:
1) series direct current arc method for measuring in brush direct current motor electric loop, in the direct current for generating interference high fdrequency component
Brush motor both ends are connected in parallel with a capacitor, and filter out a part interference high fdrequency component；
2) it and generates between the brush direct current motor and series direct current arc fault detection current probe that interfere high fdrequency component
Circuit in connect an inductance, prevent electrical equipment generate high fdrequency component flow through series direct current arc fault detection electric current spy
Head, wherein it is DC output side measure loop capacitance current that current probe, which measures electric current,；
3) by the electric current measured on detection current probe, and Time-Frequency Analysis is carried out to electric current, is existed according to electric current
Generation of the series direct current arc fault in DC loop is judged in the increase of amplitude in 1-100kHz frequency domain.
In the brush direct current motor both ends shunt capacitance for generating interference high fdrequency component, capacitance is 1 μ F-1000 μ F.
Between the brush direct current motor and series direct current arc fault detection current probe for generating interference high fdrequency component
One inductance of series connection in circuit, inductance value are 100 μ H-2mH.
The beneficial effects of the present invention are:
1. utilizing series inductance, the mode of shunt capacitance can be effectively filtered out because brush direct current motor work belt is come to series connection
The interference of direct current arc fault detection, principle is simple, and effect is obvious；
2. using the increase of the amplitude in loop current frequency domain it may determine that the generation of series direct current arc fault out, inspection
It is high to survey precision.
Detailed description of the invention
Fig. 1 is brush direct current motor electrical system circuit diagram of the invention；
Fig. 2 is high frequency signal filtration result schematic diagram of the present invention；
Fig. 3 is that series direct current electric arc generates front and back spectrogram in the present invention；
Fig. 4 is that series direct current electric arc generation front and back frequency spectrum 1-100kHz frequency band integrated value changes over time figure in the present invention.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in detail.
Series direct current arc method for measuring in brush direct current motor electric loop of the present invention interferes high frequency generating
The brush direct current motor both ends of component are connected in parallel with a capacitor the capacitor that value is 1 μ F-1000 μ F, filter out a part and interfere high frequency division
Amount；In circuit between the brush direct current motor and series direct current arc fault detection current probe of generation interference high fdrequency component
Inductance value of connecting is the inductance of 100 μ H-2mH, and the high fdrequency component for preventing electrical equipment from generating flows through the event of series direct current electric arc
Barrier detection current probe.Current probe is used to measure DC output side measure loop capacitance current.By on detection current probe
Obtained electric current is measured, and Time-Frequency Analysis is carried out to electric current, it can be with according to the increase of electric current amplitude in 1-100kHz frequency domain
Judge generation of the series direct current arc fault in DC loop.
As shown in Figure 1,1 being DC power supply, 2 being measure loop capacitor, 3 be filter inductance, 4 being that brush direct current motor is negative
Carry, 5 be filter capacitor, 6 be detect current probe.
In the present embodiment, it is connected in parallel with a capacitor at the brush direct current motor both ends for generating interference high-frequency signal, capacitance is
147 μ F, for filtering out a part interference high-frequency signal；
In the present embodiment, with the brush direct current motor and series direct current arc fault detection electric current for generating interference high-frequency signal
The inductance of series connection one in circuit between probe, inductance value 1mH, the interference high-frequency signal for preventing motor from generating flow through
Arc-detection current probe；
Fig. 2, which show to increase, measures current spectrum on filter capacitor and filter inductance front and back current probe.As can be seen that increasing
After adding filter capacitor and filter inductance, current spectrum amplitude declines, it is possible to prevente effectively from brush direct current motor generates just
Interference of the normal high-frequency signal to detection current probe.
In the present embodiment, current probe is the TCPA300 model current probe of Imtech, and current probe bandwidth is DC-
100MHz, oscillograph sample frequency f=200MHz, sampling time 100ms, sampling number 20M utilize manual operation in 10ms
Voltaic arc generating device generates series direct current electric arc；
In the present embodiment, the electric current measured on current probe is detected, Time-Frequency Analysis is carried out to it, time window is selected as 5ms.
If 1-100kHz amplitude integral is more than threshold value in current frequency domain, judge that series direct current arc fault generates.The present embodiment intermediate frequency
Spectral integral value threshold value is selected as 0.5.
Fig. 3 show detection current probe and measures spectral contrast figure of the electric current before and after the generation of series direct current arc fault.
As can be seen that current spectrum amplitude increases after series direct current arc fault generates, the increasing integrated according to current spectrum amplitude
Add, can effectively detect the generation of series direct current arc fault.
Fig. 4 show detection current probe and measures electric current 1- in the frequency spectrum before and after the generation of series direct current arc fault
100kHz Frequency Domain Integration value changes over time figure.As can be seen that Frequency Domain Integration value increases at 10ms, and surpass at 15ms
Cross threshold value, it is believed that series direct current arc fault generates in circuit.
Claims (3)
1. series direct current arc method for measuring in brush direct current motor electric loop, which is characterized in that specific step is as follows:
1) series direct current arc method for measuring in brush direct current motor electric loop, in the DC brush for generating interference high fdrequency component
Motor both ends are connected in parallel with a capacitor, and filter out a part interference high fdrequency component；
2) electricity between the brush direct current motor and series direct current arc fault detection current probe of generation interference high fdrequency component
One inductance of series connection in road, the high fdrequency component for preventing electrical equipment from generating flow through series direct current arc fault detection current probe,
Wherein, current probe measurement electric current is DC output side measure loop capacitance current；
3) by the electric current measured on detection current probe, and Time-Frequency Analysis is carried out to electric current, according to electric current in 1-
Generation of the series direct current arc fault in DC loop is judged in the increase of amplitude in 100kHz frequency domain.
2. series direct current arc method for measuring in brush direct current motor electric loop according to claim 1, feature exist
In in the brush direct current motor both ends shunt capacitance for generating interference high fdrequency component, capacitance is 1 μ F-1000 μ F.
3. series direct current arc method for measuring in brush direct current motor electric loop according to claim 1, feature exist
In in the circuit between the brush direct current motor and series direct current arc fault detection current probe for generating interference high fdrequency component
It connects an inductance, inductance value is 100 μ H-2mH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910371744.7A CN110007231A (en) | 2019-05-06 | 2019-05-06 | Series direct current arc method for measuring in brush direct current motor electric loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910371744.7A CN110007231A (en) | 2019-05-06 | 2019-05-06 | Series direct current arc method for measuring in brush direct current motor electric loop |
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| Publication Number | Publication Date |
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| CN110007231A true CN110007231A (en) | 2019-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910371744.7A Pending CN110007231A (en) | 2019-05-06 | 2019-05-06 | Series direct current arc method for measuring in brush direct current motor electric loop |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110824320A (en) * | 2019-12-16 | 2020-02-21 | 常熟开关制造有限公司(原常熟开关厂） | Direct current arc fault detection method and device |
| CN111398750A (en) * | 2020-03-30 | 2020-07-10 | 深圳供电局有限公司 | Arc identification method and system for arc identification |
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|---|---|---|---|---|
| CN110824320A (en) * | 2019-12-16 | 2020-02-21 | 常熟开关制造有限公司(原常熟开关厂） | Direct current arc fault detection method and device |
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| CN111398750A (en) * | 2020-03-30 | 2020-07-10 | 深圳供电局有限公司 | Arc identification method and system for arc identification |
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Application publication date: 20190712 |