CN105510777A - Differential pulsed magnet insulation fault detection device - Google Patents
Differential pulsed magnet insulation fault detection device Download PDFInfo
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- CN105510777A CN105510777A CN201510856841.7A CN201510856841A CN105510777A CN 105510777 A CN105510777 A CN 105510777A CN 201510856841 A CN201510856841 A CN 201510856841A CN 105510777 A CN105510777 A CN 105510777A
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- detecting coil
- insulation fault
- pulse magnet
- voltage divider
- signal
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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
Abstract
The invention discloses a differential pulsed magnet insulation fault detection device. The differential pulse magnet insulation fault detection device comprises a first detection coil, a second detection coil, a resistance voltage divider, a high-pass filter and a high-sampling rate oscilloscope; the two detection coils are arranged along the central axis of a pulsed magnet, wherein one detection coil is arranged in the of the pulsed magnet and is adjacent to the upper port of the pulsed magnet, the other detection coil is arranged outside the pulsed magnet; two fixed ends of the resistance voltage divider are connected with the positive end and negative end of the first detection coil; the negative end of the second detection coil is connected with the negative end of the first detection coil; the input positive end of the high-pass filter is connected with the movable end of the resistance voltage divider; the input negative end of the high-pass filter is connected with the positive end of the second detection coil; the two detection coils and the resistance voltage divider form a differential structure; differential processing is performed on two detection signals; output signals are filtered and sampled; partial discharge signals are acquired; an insulation fault point is determined according to the partial discharge signals. With the differential pulsed magnet insulation fault detection device of the invention adopted, acquisition of the weak local signals of the insulation fault of the pulsed magnet can be realized. The differential pulsed magnet insulation fault detection device is advantageous in high sensitivity detection.
Description
Technical field
The invention belongs to pulse magnet insulation fault Detection Techniques field, more specifically, relate to a kind of differential type pulse magnet insulation fault sniffer.
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 more high strength, more can meet some experiment requirement to high-intensity magnetic field.But along with magnetic field intensity improves constantly, the electricity produced under high-intensity magnetic field condition, heat, power extreme condition likely destroy the insulation of magnet; Insulation fault is initial often comparatively more small in rudiment, if can not Timeliness coverage, insulation fault can expand gradually, finally destroys pulse magnet and even jeopardizes experimental facilities safety; Therefore need paired pulses magnet insulation status to carry out Real-Time Monitoring, detect the local discharge signal produced because of insulation breakdown, to find small insulation fault in advance, reject fault magnet, ensure the safe and stable operation of impulse magnetic field device.
In the pulse magnet course of work, when just starting insulation breakdown occurs, the local discharge signal of generation is fainter, and magnitude of voltage is in millivolt level, and frequency reaches more than megahertz; And the dB/dt signal of pulse magnet itself reaches tens volts; To detect that the local discharge signal mixed wherein is more difficult in pulse magnet self reasons for its use signal; Prior art utilizes oscillograph to gather local discharge signal, wider bandwidth can be accomplished, larger memory capacity, and oscillographic sampling rate is very high, 500MHz even more than 1GHz can be reached, but oscillographic sampling resolution is not high, general sampling resolution only has 8, tells local discharge signal the voltage signal (dB/dt) that cannot produce from the changes of magnetic field of pulse magnet.The general data collecting card of current application is various in style, resolution is higher, but sampling rate is medium, and generally in hundreds of KHz, minority can reach the capture card of megahertz costly, easily thousands of unit, and cost is too high; These two kinds of modes all cannot be directly used in the collection of the faint local signal of paired pulses magnet insulation fault.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of differential type pulse magnet insulation fault sniffer, its object is to solve the problem that prior art effectively cannot detect the faint local discharge signal at pulse magnet insulation fault initial stage.
For achieving the above object, according to one aspect of the present invention, propose a kind of differential type pulse magnet insulation fault sniffer, comprise the first detecting coil, the second detecting coil, resitstance voltage divider and wave filter;
Wherein, the first detecting coil and the second detecting coil are all arranged along pulse magnet center axis, and the first detecting coil is located in pulse magnet, and the second detecting coil is arranged on outside pulse magnet;
Two detecting coils are arranged as mentioned above, when insulation fault occurs at any position of pulse magnet, two detecting coils all can detect local discharge signal, and the signal intensity that detects of the first detecting coil is greater than the signal intensity that the second detecting coil detects;
Two stiff ends of resitstance voltage divider are connected with the positive and negative two ends of the first detecting coil respectively; The movable terminal of resitstance voltage divider is as output plus terminal; The negative terminal of the second detecting coil is connected with the negative terminal of the first detecting coil signal, and the anode of the second detecting coil is as output negative terminal; The movable terminal of the input anode contact resistance voltage divider of wave filter, input negative terminal connects the anode of the second detecting coil;
Two detecting coils are as above connected with resitstance voltage divider, make the signal U that the first detecting coil detects
1after resitstance voltage divider dividing potential drop, the signal U detected with the second detecting coil
2differential concatenation; Two detecting coils and resitstance voltage divider form differential configuration, this differential configuration output signal U
3; Wherein, resitstance voltage divider dividing potential drop coefficient k≤1;
The voltage signal (dB/dt) that the changes of magnetic field of the pulse magnet that detecting coil detects produces is according to the proportional relation of distance of pulse magnet interior location and detecting coil; In pulse magnet naked fault, when local discharge signal, above-mentioned differential configuration carries out difference processing, output signal U to the signal that two detecting coils detect
3=kU
1-U
2;
Owing to circuit existing stray inductance and stray capacitance, U
3actual value non-vanishing; By adjusting resistance voltage divider, U can be made
3level off to 0 as far as possible to reduce the interference of spurious signal to local discharge signal; When the signal that detecting coil detects comprises local discharge signal, the proportionate relationship of the local discharge signal that two detecting coils detect is different from the proportionate relationship of pulse magnet changes of magnetic field institute reasons for its use voltage dB/dt, after difference processing, the output signal U of differential configuration
3in except spurious signal, also comprise local discharge signal; Wave filter, then for filtering spurious signal, exports high frequency partial discharge signal, according to this local discharge signal, then can orient the point that insulation fault occurs in pulse magnet.
Preferably, in said apparatus, the first detecting coil is located at apart from the position within pulse magnet upper port 2cm in pulse magnet, and the second detecting coil is arranged on pulse magnet external distance magnet 2cm ~ 4cm place.
Preferably, above-mentioned wave filter adopts cutoff frequency at the Hi-pass filter of megahertz level; Because the amplitude of the Amplitude Ration local discharge signal of pulse magnet background signal is large, adopt cutoff frequency at the Hi-pass filter wiping out background signal of megahertz level, to eliminate the interference to local discharge signal.
Preferably, above-mentioned differential type pulse magnet insulation fault sniffer, also comprises oscilloscope device, for gathering local discharge signal.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
(1) differential type pulse magnet insulation fault sniffer provided by the invention, two diverse location detecting coil output signals are subtracted each other, to eliminate background signal, remain local discharge signal preferably, there is the feature high to fine setting local discharge signal detection sensitivity;
(2) differential type pulse magnet insulation fault sniffer provided by the invention, in circuit, the integrated device such as otiose operational amplifier, reduces the interference of noise signal, has circuit simple, the feature that anti-interference is good.
Accompanying drawing explanation
Fig. 1 is detecting coil and the pulse magnet position relationship schematic diagram of differential type pulse magnet insulation fault sniffer provided by the invention;
The differential type pulse magnet insulation fault sniffer functional block diagram that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the local discharge signal waveform schematic diagram detected in the embodiment of the present invention;
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
1-first detecting coil, 2-second detecting coil, 3-magnet insulation fault point, 4-pulse magnet, 5-pulse magnet axis, the U1 waveform that 11-first detecting coil detects, 12-spurious signal U
3waveform, the local discharge signal waveform that 13-insulation fault produces,
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The differential type pulse magnet insulation fault sniffer that the embodiment of the present invention provides, comprises the oscillograph of the first detecting coil, the second detecting coil, resitstance voltage divider, Hi-pass filter and high sampling rate;
As shown in Figure 1, first detecting coil 1 and the second detecting coil 2 are all arranged along pulse magnet center axis, and the first detecting coil 1 is located in pulse magnet 1, within pulse magnet upper port 2cm, second detecting coil arranges 2 outside pulse magnet, apart from magnet 2cm ~ 4cm;
As shown in Figure 2, in the differential type pulse magnet insulation fault sniffer that embodiment provides, two stiff ends of resitstance voltage divider are connected with the positive and negative two ends of the first detecting coil 1 respectively; The negative terminal of the second detecting coil 2 is connected with the negative terminal of the first detecting coil signal; The movable terminal of the input anode contact resistance voltage divider of Hi-pass filter, input negative terminal connects the anode of the second detecting coil 2;
The signal U that first detecting coil 1 detects
1after resitstance voltage divider dividing potential drop, the signal U detected with the second detecting coil 2
2differential concatenation, forms differential configuration, this differential configuration output signal U
3; In pulse magnet naked fault, when local discharge signal, the input signal U3=kU1-U2=0 of Hi-pass filter; K is the dividing potential drop coefficient of resitstance voltage divider;
In embodiment, the insulation fault of pulse magnet occurs in the position in Fig. 1 shown in 3, and this insulation fault point produces local discharge signal; Coil turn 40 circle of the detecting coil adopted in the present embodiment, wire adopts 0.2mm enameled wire; Resistance range 0 ~ 50k Ω of the resitstance voltage divider adopted; Bandwidth 0.1MHz ~ the 1GHz of the Hi-pass filter adopted; The oscillographic sample frequency 5GHz adopted.
In the process of insulation fault generation shelf depreciation, owing to there is stray inductance and stray capacitance in loop, U3=kU1-U2 ≠ 0, make U3 value little as much as possible by the multiple of adjusting resistance voltage divider; Not only spurious signal is comprised but also comprise local discharge signal in U3;
The waveform collected in the present embodiment as shown in Figure 3, mark in figure: the 11 pulse magnet changes of magnetic field institute reasons for its use voltage signal dB/dtU1 detected for the first detecting coil reduce the waveform of 10 times, 12 is the waveform of spurious signal U3, and 13 is the local discharge signals that insulation fault produces; Low frequency spur signal in Hi-pass filter filtering waveform 12, the local discharge signal got is as waveform 13; In waveform 13, mark out the position into local discharge signal produces with A, B, C, above-mentioned position is consistent with actual insulation trouble spot; In Fig. 3, for ease of observation, the dB/dt signal U1 detected by the first detecting coil reduces 10 times.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a differential type pulse magnet insulation fault sniffer, is characterized in that, described device comprises the first detecting coil, the second detecting coil, resitstance voltage divider and wave filter;
Described first detecting coil and the second detecting coil are all arranged along pulse magnet center axis, and the first detecting coil is located in pulse magnet, and the second detecting coil is arranged on outside pulse magnet;
Two stiff ends of described resitstance voltage divider are connected with the positive and negative two ends of the first detecting coil respectively; The negative terminal of the second detecting coil is connected with the negative terminal of the first detecting coil signal; The movable terminal of the input anode contact resistance voltage divider of wave filter, input negative terminal connects the anode of the second detecting coil;
First, second detecting coil described is connected as mentioned above with resitstance voltage divider, and the signal that the first detecting coil is detected is after resitstance voltage divider dividing potential drop, and the signals reverse detected with the second detecting coil is connected; Two detecting coils and resitstance voltage divider form differential configuration; The output signal of this differential configuration comprises spurious signal and local discharge signal; Described wave filter, then for filtering spurious signal, exports high frequency partial discharge signal.
2. differential type pulse magnet insulation fault sniffer as claimed in claim 1, it is characterized in that, described first detecting coil is located at apart from the position within pulse magnet upper port 2cm in pulse magnet, and the second detecting coil is arranged on pulse magnet external distance magnet 2cm ~ 4cm place.
3. differential type pulse magnet insulation fault sniffer as claimed in claim 1, is characterized in that, described wave filter adopts cutoff frequency at the Hi-pass filter of megahertz level.
4. the differential type pulse magnet insulation fault sniffer as described in any one of claims 1 to 3, is characterized in that, described differential type pulse magnet insulation fault sniffer also comprises oscilloscope device, for gathering 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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| CN105510777A true CN105510777A (en) | 2016-04-20 |
| CN105510777B CN105510777B (en) | 2018-11-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104569772A (en) * | 2014-12-18 | 2015-04-29 | 北京新能源汽车股份有限公司 | Electric high-voltage direct current insulation detecting circuit and method |
| CN104749498A (en) * | 2015-01-28 | 2015-07-01 | 西安交通大学 | Portable partial discharge detecting and diagnosing 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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2015
- 2015-11-28 CN CN201510856841.7A patent/CN105510777B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104569772A (en) * | 2014-12-18 | 2015-04-29 | 北京新能源汽车股份有限公司 | Electric high-voltage direct current insulation detecting circuit and method |
| CN104749498A (en) * | 2015-01-28 | 2015-07-01 | 西安交通大学 | Portable partial discharge detecting and diagnosing 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN105510777B (en) | 2018-11-02 |
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