CN107202920B - Detection device and detection method for winding element - Google Patents
Detection device and detection method for winding element Download PDFInfo
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- CN107202920B CN107202920B CN201610903098.0A CN201610903098A CN107202920B CN 107202920 B CN107202920 B CN 107202920B CN 201610903098 A CN201610903098 A CN 201610903098A CN 107202920 B CN107202920 B CN 107202920B
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- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 238000004804 winding Methods 0.000 title abstract 7
- 238000012360 testing method Methods 0.000 claims abstract description 44
- 238000005259 measurement Methods 0.000 claims abstract description 42
- 230000002159 abnormal effect Effects 0.000 claims abstract description 24
- 230000005611 electricity Effects 0.000 claims abstract description 10
- 239000011229 interlayer Substances 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 8
- 230000010355 oscillation Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 101100117775 Arabidopsis thaliana DUT gene Proteins 0.000 description 2
- 101150091805 DUT1 gene Proteins 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011162 core material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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Abstract
A detection device of a winding element and a detection method thereof are provided, wherein the detection device is provided with an electricity storage unit, a resonance capacitor, a switch unit, a measurement unit and a control unit. The electricity storage unit stores preset electric energy. The switch unit is arranged on a power supply path between the power storage unit and the winding element. When the test interval begins, the switch unit is switched on, and the electricity storage unit releases preset electric energy to the winding element and the resonance capacitor. The measuring unit is coupled to two ends of the winding element and generates a measuring waveform according to the voltage value of the winding element in the test interval. The control unit monitors the discharging current when the electricity storage unit releases the preset electric energy in the test interval, and controls the switch unit not to be conducted when the current value of the discharging current is reduced to the preset current value. The control unit judges whether the impedance value of the winding element is abnormal or not according to the measuring waveform generated by the measuring unit.
Description
Technical field
The present invention relates to a kind of detection device of wound element and its detection method, especially a kind of judgement wound element is humorous
Impedance value when vibration whether the detection device and its detection method of Yi Chang wound element.
Background technique
General wound element, such as inductor, motor or other electronic components with coil are used in electric and electronic
It, may be because of the potential factor of the self defective insulation of coil when in product.The potential factor of defective insulation allows wound element short-term
Under making, the function of using remains normal, but may influence product stability and service life under being used for a long time.Therefore, wound element must
Quality must be examined using interlayer voltage-resisting test apparatus.Interlayer voltage-resisting test apparatus for continuity can be surveyed in high-frequency and high-voltage or pulse
Examination adds specification high pressure at coil both ends, and observes whether coil at such high pressures generates collapse or electrical discharge.
For partial wound element because the insulation degree of core material is poor, the energy being present in coil can be because of material electricity
It hinders and generates heat and dissipate, cause the ratio of energy storage and energy consumption relatively low, that is, quality factor Q value is lower.Usual quality factor Q value is lower
Wound element must be tested out, to the processing of undesirable wound element, improvement or to abandon, but in the past for wound element
The interlayer voltage-withstand test of progress simultaneously can not measure the lower wound element of quality factor Q value, so that in the detection of wound element more
For very complicated.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of detection device of wound element and its detection method, so as to
Solve the problems, such as that existing interlayer voltage-withstand test can not measure the lower wound element of quality factor Q value.
To achieve the goals above, the present invention provides a kind of detection devices of wound element, have charge storage unit, resonance
Capacitor, switch unit, measurement unit and control unit.Charge storage unit is to store default electric energy.Switch unit is set to storage
On supply path between unit and wound element.When test section starts, switching means conductive, charge storage unit release is preset
Electric energy is to wound element and resonant capacitance.Measurement unit is coupled to the both ends of wound element, to foundation wound element in test
The voltage value in section generates and measures waveform.Control unit is in test section, putting when monitoring charge storage unit discharges default electric energy
Electric current, and when the current value of discharge current is reduced to pre-set current value, control switch unit is not turned on.Control unit foundation
Whether the measurement waveform that measurement unit generates, impedance value when judging wound element resonance are abnormal.
In order to which above-mentioned purpose is better achieved, the present invention also provides a kind of detection methods of wound element, comprising:
A default electric energy is stored with a charge storage unit；
When a test section starts, the supply path between the charge storage unit and a wound element is connected, makes the storage
Electric unit discharges the default electric energy to the wound element and a resonant capacitance；
In the test section, the discharge current when charge storage unit discharges the default electric energy is monitored；
When the current value of the discharge current is reduced to a pre-set current value, it is not turned on the supply path；
According to the voltage value at wound element both ends in the test section, generates one and measure waveform；And
According to the measurement waveform, whether impedance value when judging the wound element resonance is abnormal.
The technical effects of the invention are that:
The detection device and its detection method of the wound element according to disclosed by aforementioned present invention, provide by charge storage unit
Electric energy is preset to wound element, during carrying out interlayer voltage-withstand test, in default electric energy electric current until reaching pre-set current value
When, it disconnects charge storage unit and provides default electric energy to the supply path of wound element, the measurement waveform of wound element is made to start to generate
Oscillation.Whether impedance value when may determine that wound element resonance from the measurement waveform of oscillation is abnormal, and then judges around line element
Whether the quality factor Q value of part complies with standard.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is the step flow chart according to the detection method of one embodiment of the invention wound element；
Fig. 2 is the circuit diagram according to the detection device of one embodiment of the invention wound element；
Fig. 3 is the current curve according to one embodiment of the invention discharge current and the schematic diagram for measuring waveform；
Fig. 4 is the area schematic diagram that waveform is measured according to another embodiment of the present invention；
Fig. 5 is the current curve according to another embodiment of the present invention discharge current and the schematic diagram for measuring waveform.
Wherein, appended drawing reference
20 detection devices
21 charge storage units
23 resonant capacitances
25 switch units
27 measurement units
29 control units
30 wound elements
Ri output impedance
Rp equivalent impedance
L equivalent inductance
Cp equivalent capacity
A, b electrical property node
T1, t2 time point
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
Fig. 1 is please referred to, Fig. 1 is the step flow chart according to the detection method of one embodiment of the invention wound element.Such as Fig. 1
Shown, detection method is for detecting wound element such as motor, inductor, transformer, generator or other members with coil
Part.When the step detected to wound element, in step S101, default electric energy is stored with charge storage unit.In step S103
In, when the test section detected to wound element starts, the supply path between charge storage unit and wound element is connected, makes
Charge storage unit discharges default electric energy to coiling unit and resonant capacitance.The default electric energy that charge storage unit is exported is, for example, high frequency height
The electric power of pressure or high-voltage pulse.
In step S105, in the test section detected to wound element, the default electricity of monitoring charge storage unit release
Discharge current when energy, and in step S107, when the current value of discharge current is reduced to pre-set current value, it is not turned on for circuit
Diameter.At this point, the voltage value at wound element both ends is vibrated according to the oscillation circuit of coiling unit and resonant capacitance, and until coiling
The voltage value at element both ends decay and level off to zero when, the test section detected to wound element terminates.In step S109
In, according to wound element in the voltage value in test section, generates and measure waveform.It is, for example, to carry out in wound element that this, which measures waveform,
It is generated immediately in the test section of detection, can also be generated after testing section, the present embodiment not limits.It
Afterwards, in step S111, measure waveform is used to judge whether impedance value of wound element when resonance be abnormal.
In aforementioned detection method, due to having equivalent capacitor, equivalent inductance and equivalent impedance in wound element,
Therefore when wound element and resonant capacitance are provided default electric energy, resonant capacitance can store electric energy, and provide in charge storage unit
Electric energy is discharged when disconnecting to the supply path of wound element, vibrates the voltage value at wound element both ends.At this point, due to around line element
Part operates under resonance frequency, and therefore, impedance caused by impedance and equivalent inductance caused by equivalent capacity is mutual in wound element
Payment, only remaining equivalent impedance influences the quality factor of wound element.Therefore, when wound element resonance, according to wound element
The voltage value at both ends changes, and can determine whether impedance value of wound element when resonance, or impedance value when judging wound element resonance
It is whether abnormal or whether comply with standard value, and then judge whether the quality factor of wound element comply with standard value.In the present embodiment
In, the wound element of standard when resonance with the impedance value of standard, therefore the impedance value when the wound element resonance of detection
With the impedance value difference of standard be above standard range when, i.e., expression wound element resonance when impedance value it is abnormal.
Fig. 2 is according to the circuit diagram of the detection device of one embodiment of the invention wound element, referring to figure 2., this reality
The detection device 20 for applying example has charge storage unit 21, resonant capacitance 23, switch unit 25, measurement unit 27 and control unit 29.
Such as capacitor of charge storage unit 21 or other elements for being suitble to store electric energy, one end of charge storage unit 21 couple switch unit 25, separately
One end coupling meets electrical node a.Switch unit 25 is coupled between charge storage unit 21 and electrical node b.Electrical node a and electrical property
Both ends of the node b to be respectively coupled to wound element 30.Resonant capacitance 23 is coupled between electrical node a and electrical node b,
It is in parallel with wound element 30.Measurement unit 27 is coupled to 30 both ends of wound element in a manner of shunting, according to wound element 30
Voltage value in test section generates and measures waveform.Control unit 29 couples measurement unit 27 and switch unit 25, to receive
The measurement waveform and be connected or be not turned on to control switch unit 25 that measurement unit 27 generates.In the present embodiment, it switchs
High power metal-oxide half field effect transistor (Metal-Oxide-Semiconductor Field-Effect can be used in unit 25
Transistor, MOSFET), insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) or
Mechanical switch.
When the conducting of 29 control switch unit 25 of control unit, supply path is led between charge storage unit 21 and wound element 30
Logical, when 29 control switch unit 25 of control unit is not turned on, supply path is not led between charge storage unit 21 and wound element 30
It is logical.In other embodiments, control unit 29 can also control power supply or other suitable power sources are provided to charge storage unit
21, to enable charge storage unit 21 before wound element 30 is detected, default electric energy is stored in advance.In this present embodiment, it detects
Device 20, which exports on default electric energy to the supply path of wound element 30, has output impedance Ri, output impedance Ri confession under directions power path
On equivalent impedance, can also refer to the equivalent impedance of other elements in detection device 20, the present embodiment not limits.
In one embodiment, before wound element 30 is detected, detection device 20 can check wound element in advance
30 whether properly connect after carry out the detection of wound element 30 again.In another embodiment, detection device 20 checks coiling
When whether element 30 properly connects, the inductance value of wound element 30 can also be tested together, and according to wound element 30
Inductance value, the default electric energy size that adjustment charge storage unit 21 stores, to control the electricity when charge storage unit 21 discharges default electric energy
Size is pressed, but is not limited according to this.
Next, please with reference to Fig. 2 and Fig. 3, Fig. 3 be according to the current curve of one embodiment of the invention discharge current and
Measure the schematic diagram of waveform.As shown, switch unit 25 is connected, charge storage unit when testing the time point t1 that section starts
21 discharge default electric energy to wound element 30.At this point, wound element 30 is applied the default electric energy of the offer of charge storage unit 21, and open
Begin to carry out interlayer voltage-withstand test.In this present embodiment, it when charge storage unit 21 discharges default electric energy, also charges to resonant capacitance 23,
And measurement unit 27 starts the voltage for capturing 30 both ends of wound element, and according to wound element 30 also when testing section and starting
The voltage value at both ends generates and measures waveform, such as the curve of DUT2 below Fig. 3.When charge storage unit 21 discharges default electric energy to coiling
When element 30, control unit 29 starts to monitor discharge current when charge storage unit 21 discharges default electric energy, the electric current of discharge current
Value is as shown in the current curve above Fig. 3.
When the time point t2 tested in section, the current value of discharge current is reduced to pre-set current value, control unit 29
Control switch unit 25 is not turned on.After switch unit 25 disconnects, measurement unit 27 is according to wound element 30 and resonant capacitance 29
Resonant tank captures the voltage value at 30 both ends of wound element, at this time the measurement waveform of wound element 30, such as DUT2 below Fig. 3
Shown in curve, start to vibrate after time point t2.
Part before control unit 29 is not turned on according to switch unit measures waveform, that is, below Fig. 3 in the curve of DUT2
Time point t1 judges whether the interlayer voltage-withstand test of wound element 30 is abnormal to the waveform between time point t2.Also, control is single
Part after member 29 is not turned on according to switch unit measures waveform, that is, in the curve of the lower section Fig. 3 DUT2 after time point t2
Whether waveform, impedance value when judging 30 resonance of wound element are abnormal.
In practice, the measurement waveform of wound element 30 is compared by control unit 29 with predetermined voltage waveform, is preset
The curve of DUT1 below voltage waveform such as Fig. 3.Measurement waveform and predetermined voltage waveform of the control unit 29 according to wound element 30
Comparison result, to judge whether impedance value when 30 resonance of wound element and interlayer voltage-withstand test abnormal.In one embodiment
In, at the time point that control unit 29 occurs according to the peak value and peak value of the measurement oscillating waveform of wound element 30, judge coiling
The voltage value rate of decay of element 30, and the rate of decay according to 30 voltage value of wound element, when judging 30 resonance of wound element
Impedance value size.
In measurement waveform shown in Fig. 3, measurement waveform of the wound element 30 between time point t1~t2 and default electricity
Corrugating relatively under, the difference of the two is in critical field, and therefore, control unit 29 judges 30 interlayer voltage-withstand test of wound element
Result without abnormal.However, measurement waveform and predetermined voltage waveform of the wound element 30 after time point t2 relatively under, two
The difference of person is not in critical field, and therefore, control unit 29 judges impedance value exception when 30 resonance of wound element.
It is the area schematic diagram for measuring waveform according to another embodiment of the present invention please with reference to Fig. 2 and Fig. 4, Fig. 4, such as schemes
Shown in 4, control unit 29 can also judge the voltage of wound element 30 according to area of the waveform in multiple time intervals is measured
It is worth the rate of decay.For example, the area A1~A4 for measuring waveform is the area measured between waveform and voltage 0V, according to area
The proportionate relationship of A1~A4, control unit 29 may determine that the voltage value rate of decay of wound element 30, and according to wound element
The rate of decay of 30 voltage values, the size of impedance value when judging 30 resonance of wound element, and then judge 30 resonance of wound element
When impedance value it is whether abnormal.In this present embodiment, wound element is judged to measure area of the waveform in multiple time intervals
The size of impedance value when 30 resonance, it is possible to reduce the bounce of 30 both end voltage value of wound element, and influence control unit 29 and sentence
The disconnected voltage value rate of decay as a result, or influencing impedance value size when control unit 29 judges 30 resonance of wound element.
Next, illustrating impedance value all controlled unit of another wound element 30 when interlayer voltage-withstand test and resonance
The abnormal embodiment of 29 judgements.It is the electric current according to another embodiment of the present invention discharge current please with reference to Fig. 2 and Fig. 5, Fig. 5
Curve and measure waveform schematic diagram, as shown in the DUT3 curve of Fig. 5, in the present embodiment, wound element 30 in time point t1~
Measurement waveform and predetermined voltage waveform between t2 relatively under, the measurement waveform resonance of wound element 30 declines the fast speed of inspection.
The voltage at wound element both ends, which soon just decays to, levels off to 0, indicates that the voltage endurance of wound element is not good enough, and pressure resistance is special
Property not in qualified critical field.In addition, measurement waveform and predetermined voltage waveform of the wound element 30 after time point t2
Under comparing, the measurement waveform of 30 both end voltage of wound element also than predetermined voltage waveform decaying speed faster, predeterminated voltage wave
Shaped like the DUT1 in Fig. 5, therefore impedance value when 30 resonance of wound element is also judged as exception.
In embodiment above-mentioned, whether the current value that control unit 29 can detect discharge current is lower than pre-set current value,
Or control unit 29 may wait for the discharge time that discharge current is reduced to pre-set current value, then control switch unit 25 disconnects.
Pre-set current value is, for example, the 60% of current peak, current peak that is, when charge storage unit 21 discharges default electric energy, according to storage
Output impedance Ri size on unit 21 and supply path, the maximum value of judged discharge current.Therefore, control unit 29
The electric discharge formula of default electric energy can be discharged according to charge storage unit 21 in advance, e.g., when judging that charge storage unit 21 discharges default electric energy,
Discharge current is reduced to the discharge time of pre-set current value.Later, the beginning timing that control unit 29 is connected in switch unit 25,
And when the time that switch unit 25 is connected reaching discharge time, then control switch unit 25 disconnects.
In specific applications, the interlayer voltage-withstand test that wound element 30 can be carried out by setting pre-set current value, is being opened
After closing the disconnection of element 25, the voltage peak at 30 both ends of wound element does not exceed the voltage peak in interlayer voltage-withstand test.And
And wound element 30 and resonant capacitance 29 also have enough electric energy, allow the voltage value at 30 both ends of wound element in switch element 25
It is vibrated again after disconnection, and then whether impedance value when detection 30 resonance of wound element is abnormal.
In summary, the embodiment of the present invention provides the detection device and its detection method of a kind of wound element, by
Charge storage unit stores default electric energy in advance, and when testing section and starting, and provides charge storage unit to default electric energy to wound element,
To carry out interlayer voltage-withstand test to wound element, and when the discharge current value of charge storage unit reaches pre-set current value, disconnection is opened
Unit is closed, so that charge storage unit is provided default electric energy and is not turned on to the supply path of wound element.Electricity according to wound element both ends
The measurement waveform that pressure generates starts to vibrate.From the measurement waveform of oscillation, then it may determine that impedance when wound element resonance
Whether value is abnormal, and then judges whether the quality factor Q value of wound element complies with standard.Whereby, coiling provided in this embodiment
The detection device and its detection method of element can when carrying out interlayer voltage-withstand test, together detect wound element resonance when
Whether impedance value is abnormal.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (10)
1. a kind of detection device of wound element characterized by comprising
One charge storage unit, to store a default electric energy；
One resonant capacitance is parallel to a wound element；
One switch unit is set on the supply path between the charge storage unit and the wound element, is opened in a test section
When the beginning, the switching means conductive, the charge storage unit discharges the default electric energy to the wound element and the resonant capacitance；
One measurement unit is coupled to the both ends of the wound element, to according to the wound element in the voltage value in the test section,
It generates one and measures waveform；And
One control unit monitors the discharge current when charge storage unit discharges the default electric energy in the test section, and in
It when the current value of the discharge current is reduced to a pre-set current value, controls the switch unit and is not turned on, control unit foundation should
The measurement waveform that measurement unit generates, whether impedance value when judging the wound element resonance is abnormal, the control unit foundation
The switch unit be not turned on after the part measurement waveform, whether impedance value when judging the wound element resonance abnormal.
2. the detection device of wound element as described in claim 1, which is characterized in that the control unit is according to the switch unit
Part measurement waveform before being not turned on also judges whether the interlayer voltage-withstand test of the wound element is abnormal.
3. the detection device of wound element as claimed in claim 2, which is characterized in that the control unit compares the measurement waveform
With a predetermined voltage waveform, whether the impedance value and interlayer voltage-withstand test when judging the wound element resonance are abnormal.
4. the detection device of wound element as claimed in claim 2, which is characterized in that in the test section, the switch list
After member is not turned on, the measurement waveform which generates starts to vibrate, and the control unit is according to the measurement waveform in multiple
Area in time interval judges the voltage value attenuation ratio of the wound element, and the control unit is according to the wound element voltage
The attenuation ratio of value also judges the impedance value size when wound element resonance.
5. the detection device of wound element as described in claim 1, which is characterized in that the charge storage unit discharges the default electric energy
There is an output impedance, wherein the control unit presets electric energy and the output according to this on to the supply path of the wound element
The size of impedance judges the pre-set current value.
6. a kind of detection method of wound element characterized by comprising
A default electric energy is stored with a charge storage unit；
When a test section starts, the supply path between the charge storage unit and a wound element is connected, makes the storage list
Member discharges the default electric energy to the wound element and a resonant capacitance；
In the test section, the discharge current when charge storage unit discharges the default electric energy is monitored；
When the current value of the discharge current is reduced to a pre-set current value, it is not turned on the supply path；
According to the voltage value at wound element both ends in the test section, generates one and measure waveform；And
According to the measurement waveform, whether impedance value when judging the wound element resonance is abnormal；
Wherein, whether the impedance value when wound element resonance is not turned in Yi Chang step, including according to the supply path
Whether the measurement waveform of part afterwards, impedance value when judging the wound element resonance are abnormal.
7. the detection method of wound element as claimed in claim 6, which is characterized in that and before being not turned on according to the supply path
The part measurement waveform, also judge whether the interlayer voltage-withstand test of the wound element abnormal.
8. the detection method of wound element as claimed in claim 7, which is characterized in that in judgement and the resonant capacitance resonance
When, whether the impedance value of the wound element is in Yi Chang step, including compares the measurement waveform and a predetermined voltage waveform, and according to
Judge whether the impedance value of the wound element and interlayer voltage-withstand test are abnormal according to comparison result.
9. the detection method of wound element as claimed in claim 7, which is characterized in that after the supply path is not turned on, the amount
It surveys waveform to start to vibrate, according to the area of the measurement waveform in multiple time intervals, judges that the voltage value of the wound element declines
Subtract ratio, and the attenuation ratio according to the wound element voltage value, judges the wound element and when the resonant capacitance resonance, it should be around
The impedance value size of thread elements.
10. the detection method of wound element as claimed in claim 6, which is characterized in that have an output on the supply path
Impedance, the detection method of the wound element further include that the size and the output impedance of electric energy are preset according to this, judge the default electricity
Flow valuve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW105108080A TWI589891B (en) | 2016-03-16 | 2016-03-16 | Detecting apparatus and detecting method for cable reel element |
| TW105108080 | 2016-03-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107202920A CN107202920A (en) | 2017-09-26 |
| CN107202920B true CN107202920B (en) | 2019-07-16 |
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|---|---|---|---|---|
| JPH02278168A (en) * | 1989-04-19 | 1990-11-14 | Nakagawa Torakichi | Apparatus for inspecting electric winding |
| JP2007108057A (en) * | 2005-10-14 | 2007-04-26 | Ecg Kokusai Co Ltd | Winding test device |
| JP2009115505A (en) * | 2007-11-02 | 2009-05-28 | Mitsubishi Electric Corp | Winding inspection device and inspection method |
| CN201707419U (en) * | 2010-05-28 | 2011-01-12 | 常州市同惠电子有限公司 | Coil turn-to-turn insulation detector |
| CN103323752A (en) * | 2013-06-05 | 2013-09-25 | 广东电网公司电力科学研究院 | Dry type air reactor turn-to-turn insulation defect detection system |
| CN203405542U (en) * | 2013-06-05 | 2014-01-22 | 广东电网公司电力科学研究院 | System for detecting dry type air reactor turn-to-turn insulation defects |
| TW201437650A (en) * | 2013-03-25 | 2014-10-01 | Chroma Ate Inc | Device for testing electrical property |
| CN204177919U (en) * | 2014-11-25 | 2015-02-25 | 广西电网有限责任公司电力科学研究院 | Based on the high direct voltage impact system of air reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02278168A (en) * | 1989-04-19 | 1990-11-14 | Nakagawa Torakichi | Apparatus for inspecting electric winding |
| JP2007108057A (en) * | 2005-10-14 | 2007-04-26 | Ecg Kokusai Co Ltd | Winding test device |
| JP2009115505A (en) * | 2007-11-02 | 2009-05-28 | Mitsubishi Electric Corp | Winding inspection device and inspection method |
| CN201707419U (en) * | 2010-05-28 | 2011-01-12 | 常州市同惠电子有限公司 | Coil turn-to-turn insulation detector |
| TW201437650A (en) * | 2013-03-25 | 2014-10-01 | Chroma Ate Inc | Device for testing electrical property |
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| CN204177919U (en) * | 2014-11-25 | 2015-02-25 | 广西电网有限责任公司电力科学研究院 | Based on the high direct voltage impact system of air reactor |
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