CN105510777B - A kind of differential type pulse magnet insulation fault detection device - Google Patents
A kind of differential type pulse magnet insulation fault detection device Download PDFInfo
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- CN105510777B CN105510777B CN201510856841.7A CN201510856841A CN105510777B CN 105510777 B CN105510777 B CN 105510777B CN 201510856841 A CN201510856841 A CN 201510856841A CN 105510777 B CN105510777 B CN 105510777B
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- search coil
- pulse magnet
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- insulation fault
- voltage divider
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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
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- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of differential type pulse magnet insulation fault detection devices, include the oscillograph of the first search coil, the second search coil, resitstance voltage divider, high-pass filter and high sampling rate；Two search coils are arranged along pulse magnet center axis, and one is set in pulse magnet, and close to pulse magnet upper port, another is arranged outside pulse magnet；Two fixing ends of resitstance voltage divider are connected with the positive and negative both ends of the first search coil respectively；The negative terminal of second search coil is connected with the negative terminal of the first search coil signal；The movable terminal of the input positive terminal connection resitstance voltage divider of high-pass filter, input negative terminal connect the anode of the second search coil；Two search coils form differential configuration with resitstance voltage divider, carry out difference processing to two detectable signals, and output signal is filtered and is sampled, and obtain local discharge signal and determine insulation fault point according to the local discharge signal；This device provided by the invention is realized to the acquisition of the faint local signal of pulse magnet insulation fault, has the characteristics that detectivity is high.
Description
Technical field
The invention belongs to pulse magnet insulation fault detection technology fields, more particularly, to a kind of differential type pulsed magnetic
Body insulation fault detection device.
Background technology
High-intensity magnetic field provides extreme experiment condition for modern scientific research, is important scientific experiment platform.High-intensity magnetic field is divided into
Impulse magnetic field and stable state high-intensity magnetic field.Impulse magnetic field can provide the magnetic field of higher intensity, can more meet certain experiments to height
The requirement of intensity magnetic field.But as magnetic field intensity is continuously improved, the electricity that is generated under the conditions of high-intensity magnetic field, heat, power extreme condition has can
The insulation of magnet can be destroyed；Insulation fault is initially often more more small in rudiment, if cannot find in time, insulation fault meeting
It is gradually expanded, finally destroys pulse magnet and even jeopardize experimental facilities safety；Therefore it needs to carry out pulse magnet insulation status
Monitoring in real time detects the local discharge signal generated by insulation breakdown, to find small insulation fault in advance, rejects failure
Magnet ensures the safe and stable operation of impulse magnetic field device.
In the pulse magnet course of work, when insulation breakdown just takes place, the local discharge signal of generation is fainter,
Voltage value in millivolt level, frequency up to megahertz or more；And the dB/dt signals of pulse magnet itself are up to more than ten volts；It will be in pulsed magnetic
Detect that mix local discharge signal therein relatively difficult in body itself reasons for its use signal；The prior art is to utilize oscillography
Device acquires local discharge signal, can accomplish wider bandwidth, larger memory capacity, and the sample rate of oscillograph is very high,
500MHz even 1GHz or more can be reached, but the sampling resolution of oscillograph is not high, general sampling resolution only has 8, can not
Local discharge signal is told in voltage signal caused by changes of magnetic field from pulse magnet (dB/dt).Application is universal at present
Data collecting card is various in style, resolution ratio is higher, but sampling rate is medium, and generally in hundreds of kHz, minority can reach
Megahertz capture card costly, thousands of members, cost are too high easily；Both modes all cannot be used directly for pulse
The acquisition of the faint local signal of magnet insulation fault.
Invention content
For the disadvantages described above or Improvement requirement of the prior art, the present invention provides a kind of insulation events of differential type pulse magnet
Hinder detection device, the faint part that pulse magnet insulation fault initial stage can not be effectively detected its object is to solve the prior art is put
The problem of electric signal.
To achieve the above object, according to one aspect of the present invention, propose that a kind of differential type pulse magnet insulation fault is visited
Survey device, including the first search coil, the second search coil, resitstance voltage divider and filter；
Wherein, the first search coil and the second search coil are arranged along pulse magnet center axis, the first search coil
In pulse magnet, the second search coil is arranged outside pulse magnet；
Two search coil setting as described above, when insulation fault, two detection lines occur for any position of pulse magnet
Circle can detect local discharge signal, and the signal strength that the first search coil detects is visited more than the second search coil
The signal strength measured；
Two fixing ends of resitstance voltage divider are connected with the positive and negative both ends of the first search coil respectively；Resitstance voltage divider can
Mobile terminal is as output plus terminal；The negative terminal of second search coil is connected with the negative terminal of the first search coil signal, the second detection line
The anode of circle is as output negative terminal；The movable terminal of the input positive terminal connection resitstance voltage divider of filter, input negative terminal connection the
The anode of two search coils；
Two search coils are as above connect with resitstance voltage divider so that the signal U that the first search coil detects1By electricity
After hindering voltage divider, the signal U that is detected with the second search coil2Differential concatenation；Two search coils and resitstance voltage divider
Form differential configuration, the differential configuration output signal U3；Wherein, resitstance voltage divider divides coefficient k≤1；
Voltage signal (dB/dt) is according to pulse magnet caused by the changes of magnetic field for the pulse magnet that search coil detects
Interior location proportional relationship at a distance from search coil；In pulse magnet naked failure, not no feelings of local discharge signal
Under condition, the signal that two search coils of above-mentioned differential configuration pair detect carries out difference processing, output signal U3=kU1-U2；
Since there are stray inductance and stray capacitance, U on circuit3Actual value be not zero；By adjusting resitstance voltage divider,
It can make U3Level off to 0 interference to reduce spurious signal to local discharge signal as far as possible；In the signal that search coil detects
Including in the case of local discharge signal, the proportionate relationship and pulse magnet of the local discharge signal that two search coils detect
The proportionate relationship of background voltage dB/dt caused by changes of magnetic field is different, after difference processing, the output signal of differential configuration
U3In other than spurious signal, further include local discharge signal；Filter is then used to filter out spurious signal, exports high frequency partial
Discharge signal can then orient the point that insulation fault occurs in pulse magnet according to the local discharge signal.
Preferably, in above-mentioned apparatus, within the first search coil is located in pulse magnet away from pulse magnet upper port 2cm
Position, the second search coil are arranged at pulse magnet external distance magnet 2cm~4cm.
Preferably, above-mentioned filter uses cutoff frequency in the high-pass filter of megahertz grade；Due to pulse magnet background
The amplitude of the Amplitude Ration local discharge signal of signal is big, and the high-pass filter wiping out background using cutoff frequency in megahertz grade is believed
Number, to eliminate the interference to local discharge signal.
Preferably, above-mentioned differential type pulse magnet insulation fault detection device, further includes oscilloscope device, for acquiring part
Discharge signal.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
(1) differential type pulse magnet insulation fault detection device provided by the invention, by two different location search coils
Output signal is subtracted each other, and to eliminate background signal, preferably remains local discharge signal, is had and is visited to fine tuning local discharge signal
The characteristics of surveying high sensitivity；
(2) differential type pulse magnet insulation fault detection device provided by the invention, otiose operation amplifier in circuit
The integrated devices such as device reduce the interference of noise signal, have circuit simple, the good feature of anti-interference.
Description of the drawings
Fig. 1 is the search coil and pulsed magnetic position of differential type pulse magnet insulation fault detection device provided by the invention
Set relation schematic diagram；
Fig. 2 is differential type pulse magnet insulation fault detection device functional block diagram provided in an embodiment of the present invention；
Fig. 3 is the partial discharge signal wave schematic diagram detected in the embodiment of the present invention；
In all the appended drawings, identical reference numeral is used for indicating identical element or structure, wherein：
The first search coils of 1-, the second search coils of 2-, 3- magnets insulation fault point, 4- pulse magnets, 5- pulse magnets
Central axes, the U1 waveforms that the first search coils of 11- detect, 12- spurious signals U3Waveform, the part that 13- insulation faults generate
Discharge signal waveform,
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
It does not constitute a conflict with each other and can be combined with each other.
Differential type pulse magnet insulation fault detection device provided in an embodiment of the present invention, including the first search coil,
The oscillograph of two search coils, resitstance voltage divider, high-pass filter and high sampling rate；
As shown in Figure 1, the first search coil 1 and the second search coil 2 are arranged along pulse magnet center axis, first visits
Test coil 1 is set in pulse magnet 4, and within pulse magnet upper port 2cm, the second search coil is arranged 2 outside pulse magnet,
Away from magnet 2cm~4cm；
As shown in Fig. 2, in the differential type pulse magnet insulation fault detection device that embodiment provides, the two of resitstance voltage divider
A fixing end is connected with the positive and negative both ends of the first search coil 1 respectively；The negative terminal of second search coil 2 and the first search coil are believed
Number negative terminal be connected；The movable terminal of the input positive terminal connection resitstance voltage divider of high-pass filter, input negative terminal connection second are visited
The anode of test coil 2；
The signal U that first search coil 1 detects1After resitstance voltage divider divides, detected with the second search coil 2
Signal U2Differential concatenation forms differential configuration, the differential configuration output signal U3；In pulse magnet naked failure, without office
In the case of portion's discharge signal, the input signal U3=kU1-U2=0 of high-pass filter；K is the partial pressure coefficient of resitstance voltage divider；
In embodiment, the insulation fault of pulse magnet is happened in Fig. 1 position shown in 3, the insulation fault point generation office
Portion's discharge signal；40 circle of coil turn of the search coil used in the present embodiment, conducting wire use 0.2mm enameled wires；It uses
0~50k of resistance range Ω of resitstance voltage divider；Bandwidth 0.1MHz~1GHz of the high-pass filter of use；What is used shows
The sample frequency 5GHz of wave device.
During shelf depreciation occurs for insulation fault, since there are stray inductance and stray capacitance, U3=in circuit
KU1-U2 ≠ 0 keeps U3 values small as far as possible by adjusting the multiple of resitstance voltage divider；Not only included spurious signal in U3 but also had included office
Portion's discharge signal；
Collected waveform in figure as shown in figure 3, mark in the present embodiment：11 pulses detected for the first search coil
Background voltage signal dB/dt U1 caused by magnets magnetic fields variation reduce 10 times of waveform, and 12 be the wave of spurious signal U3
Shape, 13 local discharge signals generated for insulation fault；High-pass filter filters out the low frequency spur signal in waveform 12, gets
Local discharge signal such as waveform 13；In waveform 13, the position generated for local discharge signal, upper rheme are marked out with A, B, C
It sets consistent with actual insulation fault point；In Fig. 3, for ease of observation, the dB/dt signals U1 contractings that the first search coil is detected
It is 10 times small.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all within the spirits and principles of the present invention made by all any modification, equivalent and improvement etc., should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of differential type pulse magnet insulation fault detection device, which is characterized in that described device include the first search coil,
Second search coil, resitstance voltage divider and filter；
First search coil and the second search coil are arranged along pulse magnet center axis, and the first search coil is set to arteries and veins
It rushes in magnet, the second search coil is arranged outside pulse magnet；
Two fixing ends of the resitstance voltage divider are connected with the positive and negative both ends of the first search coil respectively；Second search coil
Negative terminal is connected with the negative terminal of the first search coil signal；The movable terminal of the input positive terminal connection resitstance voltage divider of filter, it is defeated
Enter the anode that negative terminal connects the second search coil；
First, second search coil is connect as described above with resitstance voltage divider so that the letter that the first search coil detects
Number after resitstance voltage divider divides, the signal differential concatenation that is detected with the second search coil；Two search coils and resistance
Divider forms differential configuration；The output signal of the differential configuration includes spurious signal and local discharge signal；The filtering
Device is then used to filter out spurious signal, and output high frequency partial discharge signal can orient arteries and veins according to the high frequency partial discharge signal
It rushes in magnet and the point of insulation fault occurs.
2. differential type pulse magnet insulation fault detection device as described in claim 1, which is characterized in that first detection
Coil is located in pulse magnet away from the position within pulse magnet upper port 2cm, and the second search coil is arranged outside pulse magnet
At magnet 2cm~4cm.
3. differential type pulse magnet insulation fault detection device as described in claim 1, which is characterized in that the filter is adopted
With cutoff frequency megahertz grade high-pass filter.
4. differential type pulse magnet insulation fault detection device as described in any one of claims 1 to 3, which is characterized in that institute
It further includes oscilloscope device to state differential type pulse magnet insulation fault detection device, for acquiring local discharge signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510856841.7A CN105510777B (en) | 2015-11-28 | 2015-11-28 | A kind of differential type pulse magnet insulation fault detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510856841.7A CN105510777B (en) | 2015-11-28 | 2015-11-28 | A kind of differential type pulse magnet insulation fault detection device |
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| Publication Number | Publication Date |
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| CN105510777A CN105510777A (en) | 2016-04-20 |
| CN105510777B true CN105510777B (en) | 2018-11-02 |
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| CN110596545A (en) * | 2019-09-04 | 2019-12-20 | 国网江苏省电力有限公司电力科学研究院 | Partial discharge detection device and detection method based on combined action of alternating current and impulse voltage |
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| JP2008216145A (en) * | 2007-03-06 | 2008-09-18 | Tokyo Electric Power Co Inc:The | Partial discharge detection method |
| CN103913681A (en) * | 2014-03-24 | 2014-07-09 | 华北电力大学 | System and method for detecting partial discharge under high-frequency voltage |
| CN104569772B (en) * | 2014-12-18 | 2017-11-17 | 北京新能源汽车股份有限公司 | Electric high-voltage direct-current insulation detection circuit and method |
| CN104749498B (en) * | 2015-01-28 | 2018-12-04 | 西安交通大学 | A kind of detection of Portable PD On-Line and diagnostic device |
| CN104749508A (en) * | 2015-04-10 | 2015-07-01 | 国网上海市电力公司 | Online partial discharge detector of power capacitor |
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