CN102236044B - Pulse current sensor and surge wave recording lightning protection box manufactured by adopting same - Google Patents
Pulse current sensor and surge wave recording lightning protection box manufactured by adopting same Download PDFInfo
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- CN102236044B CN102236044B CN201010150465.7A CN201010150465A CN102236044B CN 102236044 B CN102236044 B CN 102236044B CN 201010150465 A CN201010150465 A CN 201010150465A CN 102236044 B CN102236044 B CN 102236044B
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- 238000005259 measurement Methods 0.000 abstract description 4
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- 238000012360 testing method Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 6
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- 230000003321 amplification Effects 0.000 description 1
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Abstract
The invention provides a pulse current sensor and a surge wave recording lightning protection box manufactured by adopting the same. The pulse current sensor comprises a pair of oppositely arranged semi-arc magnetic cores, wherein an air gap is reserved between the two semi-arc magnetic cores; a nonmagnetic metallic conducting ring is sleeved outside the air gap, and an inner bore axial line of the nonmagnetic metallic conducting ring is in accordance with the magnetic lines of the semi-arc magnetic cores; coils are wound on the semi-arc magnetic cores, and output terminals are led from the coils. In the pulse current sensor, two nonmagnetic metallic conducting rings are arranged in two symmetric gaps of the two semi-arc magnetic cores; therefore, under the action of the two semi-arc magnetic cores, the pulse current sensor is free of magnetic circuit saturation, and the output accuracy and output range of the pulse current sensor are improved, which establishes a foundation for displaying a whole voltage oscillogram. By the adoption of the pulse current sensor, the test sensitivity is improved, and the measurement error is reduced.
Description
Technical field
The present invention relates to a kind of surge ripple lightning protection box that records, the lightning protection box that especially can inquire about the waveform recording of thunder-strike current and surge current.
Background technology
At present, known lightning protection box is comprised of shell, connection terminal, conductive connecting, electrode, semi-conductor chip, mechanical thermal trip gear, indicating device, counter device, current peak demonstration and sectional fixture.Its principle of work is to be arranged on respectively between the phase line and ground wire, zero line and ground wire of distribution system.When there is high voltage surge ripple or lightning wave and reaching the conducting of vitalizing semiconductor chip in distribution system, self high resistance of chip sharply declines and makes it to become low-resistance conductor and electric discharge over the ground, at this moment the surge high voltage in distribution system sharply declines, voltage drop in discharge process is over the ground during to certain specified normal voltage, the self-resistance of semi-conductor chip increases and makes it to enter closed condition rapidly, at this moment semi-conductor chip is equivalent to insulator, make distribution system voltage recover normal, thereby the high pressure superpotential that distribution system is occurred exclude.Display shows current peak, time, and under counter records, this process is for once.But, the raising to power supply quality requirements along with consumer and electronic equipment, the surge clutter that people must be understood occur on power supply and signal line, especially need to understand the width of waveform, shape, size, the time of energy and generation, and in the process of Thunder Protection, only show current peak, time and number of times, that which type of surge ripple or lightning wave can not differentiate and distinguish this superpotential be, this just cannot analyze the accident causing due to surge ripple or lightning wave, cannot demonstrate the energy size of this process, cannot carry out comprehensive assessment to accident.
Summary of the invention
In order to overcome existing lightning protection box, can not differentiate and record waveform and the energy size of surge ripple or lightning wave, the invention provides a kind of lightning protection box of energy complete documentation over-voltage waveform, this lightning protection box adopts the pulses of current sensor in the present invention, thereby can differentiate and record time, waveform shape and the parameter that the lightning wave that at every turn passes through, surge ripple superpotential occur, thereby solved the accident that existing lightning protection box cannot wave recording cannot cause thunder and lightning or surge waveform, carry out assessment and analysis.
For addressing the above problem, the present invention by the following technical solutions:
In the present invention, a kind of pulses of current sensor comprises: the semi arch magnetic core of pair of opposing, between two semi arch magnetic cores, be air gap, air gap overcoat is nonmagnetic metallic conduction ring, the interior axially bored line of described nonmagnetic metallic conduction ring is consistent with the magnetic line of force of semi arch magnetic core; On described semi arch magnetic core, be wound around coil is set, from coil, draw lead-out terminal.
Described semi arch magnetic core is arranged on insulating base and is with in the formed cavity of magnetic shielding shell.
On described insulating base, conductive pole is set.
In the present invention, a kind of surge ripple lightning protection box that records that adopts above-mentioned pulses of current sensor and make comprises: switch, hot dropout relay system and electrode that on each phase line and zero line, series connection arranges, between the two poles of the earth of electrode, be provided with semi-conductor chip, described phase line is all connected with ground wire with zero line, on described ground wire, pulses of current sensor is set, pulses of current sensor is connected with single-chip microcomputer by A/D translation interface, and described single-chip microcomputer is connected with display screen.
Described single-chip microcomputer is connected with computer system by communication interface, and computer system is connected with printer with display device.
Described communication interface is RS232 interface.
Described single-chip microcomputer is also connected with backup battery.
Operational failure pilot lamp and pilot lamp working properly are all set on each described phase line and zero line.
Adopt the present invention of technique scheme, on ground wire, be provided with pulses of current sensor, this pulses of current sensor has been installed respectively two nonmagnetic metallic conduction rings in two gaps of two semi arch magnetic core symmetries, like this, under the effect of two semi arch magnetic cores, this pulses of current sensor there will not be magnetic circuit saturated phenomenon, output accuracy and the output area of pulses of current sensor have been improved, for showing whole voltage oscillogram, lay a good foundation, and this pulses of current sensor has improved measurement sensitivity, has reduced measuring error.Like this, when lightning wave or the generation of surge ripple, the semi-conductor chip conducting that is excited, superpotential is discharged over the ground along ground wire, the pulses of current sensor being arranged on ground wire passes through electric resistance partial pressure by image data, isolation is amplified, level conversion, A/D conversion, again through preposition isolation, trigger relatively, CPLD controls by Single Chip Microcomputer (SCM) system and is stored in FLASH storer and is showing screen display, computer software can be by the whole oscillogram of stored record, time, parameter passes in computing machine, can be presented at one by one with on the display of parameter coordinate and print waveform, real-time time and historical record, the accident that can cause thunder and lightning or surge ripple is analyzed intuitively and judges.
Accompanying drawing explanation
Fig. 1 is the electrical principle structural drawing of pulses of current sensor in the present invention;
Fig. 2 is the one-piece construction schematic diagram of pulses of current sensor in the present invention;
Fig. 3 is that the A-A of Fig. 2 is to cut-open view;
Fig. 4 records the structural representation of surge ripple lightning protection box in the present invention;
Fig. 5 records the schematic block circuit diagram of surge ripple lightning protection box in the present invention;
Fig. 6 records the process flow diagram that surge ripple lightning protection box obtains current waveform in the present invention;
Fig. 7 records the final retrievable current waveform figure of surge ripple lightning protection box in the present invention.
Embodiment
As shown in Figure 1, pulses of current sensor in the present embodiment refers to: the semi arch magnetic core 22 that comprises pair of opposing, between two semi arch magnetic cores 22, it is air gap 30, the nonmagnetic metallic conduction ring 29 of air gap 30 overcoat, the interior axially bored line of nonmagnetic metallic conduction ring 29 is consistent with the magnetic line of force of semi arch magnetic core 22; On semi arch magnetic core 22, be wound around coil 23 is set, from coil 23, draw lead-out terminal 31.It is pointed out that the semi arch magnetic core 22 in the present invention refers to the shape that is similar to semicircle, that is: it can be both two regular semicircles, and air gap 30 is left in centre; Also can be a pair of circular arc more smaller than semicircle, be air gap 30 in the middle of two circular arcs.
This pulses of current sensor is the improvement to Luo-coil, and its concrete demagnetization principle is:
First, the full circle magnetic core of sealing is originally changed into two semi arch magnetic cores 22, and make two semi arch magnetic cores 22 and two air gaps 30 jointly form magnetic circuits, because the magnetic resistance of air gap 30 is far longer than the magnetic resistance of two semi arch magnetic core 22 magnetic materials, most of magnetic field energy is gathered in air gap 30, thereby can bear larger magnetic field intensity than former magnetic field; Secondly, when producing magnetic field on two semi arch magnetic cores 22 and two common formation magnetic circuits of air gap 30, due to air gap 30 along magnetic circuit center line by two nonmagnetic metallic conduction rings 29 and radially surrounded by it, will in two nonmagnetic metallic conduction rings 29, produce radial loop electric current like this, and the magnetic field that on two nonmagnetic metallic conduction rings 29, circular current produces is contrary with magnetic field, also can offset the magnetic field intensity of magnetic circuit; Finally, owing to producing and having radial loop electric current in two nonmagnetic metallic conduction rings 29, and itself there is resistance in two air gaps 30, by producing Joule heat after electric current, Joule heat raises two nonmagnetic metallic conduction ring 29 temperature, the magnetic field energy in two air-gap fields changes heat energy into by these two nonmagnetic metallic conduction rings 29, can bear larger magnetic field intensity like this than former magnetic field.Therefore, under the effect of two circular arc magnetic cores 22, two air gaps 30 and two air gaps 30, at the scope internal magnetic field of setting, there will not be magnetic circuit saturated phenomenon, thereby output accuracy and the output area of pulses of current sensor 17 have been improved, improved measurement sensitivity, reduce measuring error, and then can collect current peak and each current value of putting in real time, for realizing the time of width, shape, size, energy and the generation of the whole voltage current waveform of output, established subbase plinth.
As shown in Figure 2 and Figure 3, this pulses of current sensor is applied to record surge ripple lightning protection box in time, above-mentioned semi arch magnetic core 22 should be arranged on insulating base 28 and be with in magnetic shielding shell 21 formed cavitys, and its tested wire is the conductive pole 25 arranging on insulating base 28.Specifically, when this pulses of current sensor of preparation, be fixedly installed primary winding winding conductive pole 25 on insulating base 28, at one end of primary winding winding conductive pole 25 installing insulating pad 24, the compacted nut 26 of insulation spacer 24 is fastening.In addition, insulating base 28 is connected with band magnetic shielding shell 21, in insulating base 28 and band magnetic shielding shell 21 formed cavitys, by nonmagnetic pin 27, be fixedly installed a pair of semi arch magnetic core 22, on semi arch magnetic core 22, be wound around secondary coil winding 23 is set, in two gaps of a pair of semi arch magnetic core 22, be all fixedly installed nonmagnetic metallic conduction ring 29, the interior axially bored line of nonmagnetic metallic conduction ring 29 is consistent with the magnetic line of force of circular arc magnetic core 22, air gap 30.
Its job applications principle is: this conductive pole 25 is the primary winding winding of this pulses of current sensor, the secondary coil winding that coil 23 on two semi arch magnetic cores 22 is this pulses of current sensor, two of placing in two gaps of two halves circular arc magnetic core 22 two ends symmetries are anti-magnetized coil winding without magnetic metallic conduction ring 29.When primary winding winding conductive pole 25 passes through a pulse current, two secondary coil windings on two semi arch magnetic cores 22 will induce voltage, and this voltage integrating meter can be restored to the pulse current passing through on primary winding winding conductive pole 25.Due to the existence of pulses of current sensor 17 as shown in Figure 1, thus measurement range can be improved, thus obtain the oscillogram of whole electric current and voltage.
On the basis of pulses of current sensor 17, the present invention has prepared again and has recorded surge ripple lightning protection box.As shown in Figure 4, this records surge ripple lightning protection box and in shell 20, is provided with three phase lines 6, zero line 7, connection terminal 18 and ground wire 16, and phase line 6 is all connected with ground wire 16 with zero line 7, and ground wire 16 is electrically connected to ground connection with shell.Wherein, on each phase line 6 and zero line 7, all series connection arranges switch 5, hot dropout relay system 4 and electrode 1, is provided with semi-conductor chip 19 between the two poles of the earth of electrode 1, and like this, each semi-conductor chip 19 just all can be connected with ground wire 16.
In the present invention, pulses of current sensor 17 is set on ground wire 16, pulses of current sensor 17 is for gathering the electric current and voltage data of electric discharge over the ground.Pulses of current sensor 17 output terminals, after divider resistance dividing potential drop, are divided into two-way.As shown in Figure 5, a road, through isolation amplification, level conversion and A/D conversion, is then stored to single-chip microcomputer 14 through FIFO; Another road, after preposition isolation, triggering comparison, CPLD control, is stored to single-chip microcomputer 14 through FIFO.Single-chip microcomputer 14 peripheries are furnished with clock circuit, FLASH storer, and single-chip microcomputer 14 outputs are connected to LCDs 8.
The output terminal that it is pointed out that single-chip microcomputer 14 can also be connected with peripheral computer system 11 by communication interface 10, and above-mentioned communication interface 10 can be RS232 communication interface, can be also 485 interfaces.Like this, peripheral computer system 11 can be carried out Long-distance Control, and can show output by peripheral hardwares such as the display device 12 that connects and printers 13.
In addition, can also be on each phase line 6 and zero line 7 cut-in operation pilot lamp power line, relay indicating light is divided into 3 two kinds of operational failure pilot lamp 2 and pilot lamp working properly, by heat dropout relay system 4, drives indication control circuits.Meanwhile, working properly during for assurance power-off, single-chip microcomputer 14 is connected with backup battery 9.
Like this, when lightning wave or the generation of surge ripple, semi-conductor chip 9 conducting that is excited, superpotential is discharged over the ground along ground wire 16, the pulses of current sensor 17 being arranged on ground wire passes through electric resistance partial pressure by the data that collect, isolation is amplified, level conversion, A/D conversion, again through preposition isolation, trigger relatively, CPLD controls by Single Chip Microcomputer (SCM) system and is stored in FLASH storer and is showing screen display, computing machine connects by RS232 interface, computer software can be by the waveform of stored record, time, parameter passes in computing machine, can be presented at one by one with on the display of parameter coordinate and print waveform, real-time time and historical record, the accident that can cause thunder and lightning or surge ripple is analyzed intuitively and judges, as shown in Figure 6.
In the embodiment shown in fig. 7, display has provided the current waveform of surge ripple in planimetric coordinates, has provided current peak, negative peak value, wavefront time, wave rear time, specific energy, the quantity of electric charge parameter of this surge ripple in table 1.
| Test period | Current peak (KA) | Negative peak value (%) | The wavefront time (us) | The wave rear time (us) | Specific energy (KJ/ Ω) | The quantity of electric charge (As) |
| 10-03-02- 09:53:49 | 62.09 | 15.28 | 7.80 | 20.09 | 52 | 1.24 |
Table 1
Claims (8)
1. a pulses of current sensor, it is characterized in that: it comprises the semi arch magnetic core (22) of pair of opposing, between two semi arch magnetic cores (22), be air gap (30), air gap (30) overcoat is nonmagnetic metallic conduction ring (29), the interior axially bored line of described nonmagnetic metallic conduction ring (29) is consistent with the magnetic line of force of semi arch magnetic core (22); Upper winding of described semi arch magnetic core (22), coil (23) is set, from coil (23), draws lead-out terminal (31).
2. pulses of current sensor according to claim 1, is characterized in that: described semi arch magnetic core (22) is arranged on insulating base (28) and is with in the formed cavity of magnetic shielding shell (21).
3. pulses of current sensor according to claim 2, is characterized in that: conductive pole (25) is set on described insulating base (28).
One kind adopt pulses of current sensor as claimed in claim 3 and make record surge ripple lightning protection box, it is included in the switch (5) of each phase line (6) and the upper series connection setting of zero line (7), hot dropout relay system (4) and electrode (1), between the two poles of the earth of electrode (1), be provided with semi-conductor chip (19), described phase line (6) is all connected with ground wire (16) with zero line (7), it is characterized in that: pulses of current sensor (17) is set on described ground wire (16), pulses of current sensor (17) is connected with single-chip microcomputer (14) by A/D translation interface (15), described single-chip microcomputer (14) is connected with display screen (8).
5. the surge ripple lightning protection box that records according to claim 4, it is characterized in that: described single-chip microcomputer (14) is connected with computer system (11) by communication interface (10), computer system (11) is connected with printer (13) with display device (12).
6. the surge ripple lightning protection box that records according to claim 5, is characterized in that: described communication interface (10) is RS232 interface.
7. the surge ripple lightning protection box that records according to claim 6, is characterized in that: described single-chip microcomputer (14) is also connected with backup battery (9).
8. the surge ripple lightning protection box that records according to claim 7, is characterized in that: operational failure pilot lamp (2) and pilot lamp working properly (3) are all set on described each phase line (6) and zero line (7).
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| CN201010150465.7A CN102236044B (en) | 2010-04-20 | 2010-04-20 | Pulse current sensor and surge wave recording lightning protection box manufactured by adopting same |
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| CN201010150465.7A CN102236044B (en) | 2010-04-20 | 2010-04-20 | Pulse current sensor and surge wave recording lightning protection box manufactured by adopting same |
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| CN102236044B true CN102236044B (en) | 2014-05-07 |
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| CN103632823B (en) * | 2013-12-06 | 2016-09-28 | 国家电网公司 | A kind of double-air-gap core electronic current transformer |
| CN103869143B (en) * | 2014-03-05 | 2017-06-20 | 西北核技术研究所 | A kind of gas-discharge current measurement apparatus |
| CN106093548B (en) * | 2016-08-04 | 2018-12-14 | 中国船舶重工集团公司第七一九研究所 | A kind of contactless high-precision shaft current measuring device |
| CN107711232A (en) * | 2017-10-31 | 2018-02-23 | 江苏镇德电力设备有限公司 | A kind of excitation-type Novel lightning-proof lightning arrester |
| CN109597007B (en) * | 2019-01-07 | 2021-03-19 | 武汉钢铁有限公司 | Semi-open type device, measuring system and measuring method for detecting magnetic performance of non-oriented silicon steel |
| CN113295920B (en) * | 2021-06-01 | 2023-02-24 | 国网伊犁伊河供电有限责任公司 | Micro-direct-current non-contact detection probe and measurement system based on magnetic resistance effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1547035A (en) * | 2003-12-12 | 2004-11-17 | 华中科技大学 | a current sensor |
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| US7174261B2 (en) * | 2003-03-19 | 2007-02-06 | Power Measurement Ltd. | Power line sensors and systems incorporating same |
| CN101135702A (en) * | 2007-09-14 | 2008-03-05 | 清华大学 | A Pulse Current Measurement Device Based on Flexible Rogowski Coil |
| US7746055B2 (en) * | 2008-10-10 | 2010-06-29 | Consolidated Edison Company Of New York, Inc. | Current measuring device |
| CN101625377A (en) * | 2009-08-14 | 2010-01-13 | 河南电力试验研究院 | High-accuracy open type Rogowski coil |
| CN201654099U (en) * | 2010-04-20 | 2010-11-24 | 安阳安科电器股份有限公司 | Pulse current sensor |
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| CN1547035A (en) * | 2003-12-12 | 2004-11-17 | 华中科技大学 | a current sensor |
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