CN102981035B - Current clamp and power quality monitoring device - Google Patents
Current clamp and power quality monitoring device Download PDFInfo
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- CN102981035B CN102981035B CN201210523532.4A CN201210523532A CN102981035B CN 102981035 B CN102981035 B CN 102981035B CN 201210523532 A CN201210523532 A CN 201210523532A CN 102981035 B CN102981035 B CN 102981035B
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- 238000012806 monitoring device Methods 0.000 title abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 60
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000004804 winding Methods 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 22
- 238000000926 separation method Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 11
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- 238000011160 research Methods 0.000 abstract description 11
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- 238000004082 amperometric method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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Abstract
The invention discloses a current clamp and a power quality monitoring device. The current clamp comprises a current induction device which comprises an iron core and a direct current component separating device, wherein the iron core is provided with a cavity matched with a measurement main body; when the measurement main body passes through the cavity, the electromagnetic induction is generated; the current induction device acquires grounding current signals in the measurement main body through the electromagnetic induction; and the direct current component separating device is connected with the current induction device to separate the alternating current from the direct current in the grounding current signals, so as to obtain and output the direct current component signal and the alternating current component signal. By virtue of the current clamp and the power quality monitoring device, the alternating current signal and the direct current signal of the grounding current at the transformer center point are synchronously measured, so that the research on the grounding direct current magnetic bias and the monitor of the power quality at the transformer center point can be performed according to the synchronously measured data of the alternating current and the direct current in the grounding current at the transformer center point.
Description
Technical field
The present invention relates to field of electrical equipment, in particular to a kind of current clamp and equipment for monitoring power quality.
Background technology
Can produce larger direct current in the Transformer Winding of on-line operation, we have the phenomenon of DC current to be referred to as electric current bias phenomenon by this in alternating current, and producing DC magnetic bias phenomena in Transformer Winding can be caused by following two reasons:
(1) dynamic change of sun plasma wind and terrestrial magnetic field interact the earth magnetism " storm " produced.Evoked ptential gradient is at the earth's surface incited somebody to action in the change of terrestrial magnetic field, its size depends on the order of severity of ground conductivity and earth magnetism storm, when this low frequency and the electric field action with certain duration when the power transformer of neutral ground, geomagnetic induction current will be brought out in the windings, its frequency is between 0.01 ~ 1Hz, compared with the AC system of 50Hz, can be similar to and regard direct current as.This DC current values is comparatively large, but the duration is short.
(2) there is the load of voltage-current relationship curve asymmetric in the parallel running of DC power transmission line and transmission line of alternation current or AC network.DC transmission system usually adopts monopole operating mode, because can utilize this good conductor of the earth, saves a wire and cost-saving.Because Underground Long-term has large DC current to flow through, thus around its current conversion station, earth's surface electric current can be produced in certain area, if not far with the transformer distance current conversion station in the AC transmission system transformer station of its parallel running, will be interfered, the direct performance of this interference effect is exactly in the exciting current of AC transformer, produce DC component by the grounded neutral of AC transformer.This DC current values is less, but the duration is longer.
Produce DC magnetic bias phenomena in the transformer of on-line operation, direct current flux makes transformer core just there will be more serious magnetic saturation every half period, exciting current high distortion, produce a large amount of harmonic wave, transformer reactive loss increases, and core loss increases, and noise and vibration increase.Serious magnetic saturation can make the flux portion closed in the core which under normal circumstances leave iron core, namely leakage flux increases, thus the stray loss in transformer hardware is increased, and it may be caused overheated, destroy insulation, damage transformer or reduce its serviceable life.In addition, DC magnetic biasing is also the key factor of the quality of power supply affecting electric system.
In order to reduce the loss of DC magnetic biasing on transformer and the impact on the quality of power supply, need alternating current and the DC current of measuring transformer centre-point earth, to carry out deep research to the DC magnetic bias phenomena of transformer, but in prior art, be directed to the medium of this special cross-section of high-power transformer centre-point earth steel plate, flexible current pincers only can the alternating current of measuring transformer centre-point earth steel plate, cannot the AC and DC current weight of measuring transformer centre-point earth steel plate simultaneously.
For the AC and DC component cannot measuring high-power transformer centre-point earth steel plate in prior art simultaneously, thus the problem of the research of transformer DC magnetic bias cannot be carried out according to the AC and DC component of transformer central point ground connection, at present effective solution is not yet proposed.
Summary of the invention
For the AC and DC component cannot measuring high-power transformer centre-point earth steel plate in correlation technique simultaneously, thus the problem of the research of transformer DC magnetic bias cannot be carried out according to the AC and DC component of transformer central point ground connection, at present effective solution is not yet proposed, for this reason, fundamental purpose of the present invention is to provide a kind of current clamp and equipment for monitoring power quality, to solve the problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of current clamp, this current clamp comprises: current sensing means, comprise iron core, iron core has the cavity matched with measurement body, and produce electromagnetic induction when measuring body through during cavity, current sensing means obtains the ground current signal in measurement body by electromagnetic induction; DC component tripping device, is connected with current sensing means, for ground current signal is carried out AC and DC current separation, to obtain and output DC component signal and AC compounent signal.
Further, current sensing means comprises: be wrapped in the iron core winding on iron core, wherein, iron core comprises the first sub-iron core and the second sub-iron core, wherein, one end of first sub-iron core is blind end, the other end is openend, and the openend of the first sub-iron core is connected with the second sub-iron core, to form cavity in the inside of iron core, wherein, cavity is rectangular enclosure; Iron core winding is wrapped on the first sub-iron core.
Further, DC component tripping device comprises: DC component separation circuit, is connected with the first output terminal of iron core winding, carries out current separation, to obtain DC component signal for the ground current signal exported the first output terminal of iron core winding; DC output end, is connected with DC component separation circuit, for output DC component signal; Ac output end, is connected with the second output terminal of iron core winding, for exporting ground current signal.
Further, DC component tripping device comprises: current suppling circuit, is connected with DC component separation circuit, for providing electric energy for DC component segregant circuit.
Further, the openend of the first sub-iron core comprises the first sub-openend and the second sub-openend, wherein, first sub-openend is connected by the first end of articulated elements with the second sub-iron core, under the state that the first sub-iron core and the second sub-iron core fasten, second sub-openend is connected with the second end of the second sub-iron core, and the first sub-iron core and the second sub-iron core are fastened and connected formation iron core.
Further, articulated elements comprises elastic locking mechanism.
Further, be provided with handle in the outside of the blind end of the first sub-iron core, DC component tripping device is arranged on the inside of handle.
Further, at the outer wrap insulating material of current sensing means.
To achieve these goals, according to a further aspect in the invention, provide a kind of equipment for monitoring power quality, this equipment for monitoring power quality comprises current clamp.
Further, equipment for monitoring power quality also comprises: the first harvester, is connected with the ac output end of current clamp, for gathering ac current signal; Second harvester, is connected with the DC output end of current clamp, for gathering DC current signal.
Pass through the present invention, the iron core of the current sensing means of current clamp has the cavity matched with measurement body, make to produce electromagnetic induction when measuring when body passes the cavity of this iron core, current sensing means is made to be obtained the ground current signal measured in body by electromagnetic induction, then this ground current signal is carried out being separated of direct current and AC compounent by DC component tripping device, obtain and output DC component signal and AC compounent signal, solve the AC and DC component simultaneously cannot measuring high-power transformer centre-point earth steel plate in prior art, thus the problem of the research of transformer DC magnetic bias cannot be carried out according to the AC and DC component of transformer central point ground connection, achieve the synchro measure of ac current signal to transformer central point ground current and DC current signal, thus the research of transformer central point ground connection DC magnetic biasing and the monitoring of the quality of power supply can be carried out according to the synchro measure data of alternating current-direct current in transformer central point ground current.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the current clamp according to the embodiment of the present invention;
Fig. 2 is the principle of work schematic diagram of the current clamp according to the embodiment of the present invention;
Fig. 3 is the detailed construction schematic diagram of the current clamp according to the embodiment of the present invention; And
Fig. 4 is the structural representation of the equipment for monitoring power quality according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Fig. 1 is the structural representation of the current clamp according to the embodiment of the present invention.Fig. 2 is the principle of work schematic diagram of the current clamp according to the embodiment of the present invention.Fig. 3 is the detailed construction schematic diagram of the current clamp according to the embodiment of the present invention.
As shown in Figure 1, current clamp provided by the invention comprises: current sensing means 10, comprise iron core 101, iron core 101 has the cavity matched with measurement body, produce electromagnetic induction when measuring body through during cavity, current sensing means 10 obtains the ground current signal measured in body by electromagnetic induction; DC component tripping device 30, is connected with current sensing means 10, for ground current signal is carried out AC and DC current separation, to obtain and output DC component signal and AC compounent signal.
Adopt current clamp of the present invention, electromagnetic induction is produced by current sensing means and measurement body, to obtain the ground current signal measured in body, DC component tripping device is connected with current sensing means, the ground current signal that DC component tripping device obtains is carried out AC and DC current separation, to obtain and output DC component signal and AC compounent signal, wherein, current sensing means comprises iron core, iron core has the cavity matched with measurement body, electromagnetic induction is produced through during cavity when measuring body, current sensing means obtains the ground current signal measured in body by electromagnetic induction.Pass through the application, the iron core of the current sensing means of current clamp has the cavity matched with measurement body, make to measure when body can pass the cavity of iron core and produce electromagnetic induction, current sensing means is made to be obtained the ground current signal measured in body by electromagnetic induction, then this ground current signal is carried out being separated of direct current and AC compounent by DC component tripping device, obtain and output DC component signal and AC compounent signal, solve the AC and DC component simultaneously cannot measuring high-power transformer centre-point earth steel plate in prior art, thus the problem of the research of transformer DC magnetic bias cannot be carried out according to the AC and DC component of transformer central point ground connection, achieve the synchro measure of ac current signal to transformer central point ground current and DC current signal, thus the research of transformer DC magnetic bias can be carried out according to the synchro measure data of alternating current-direct current in transformer central point ground current.
Wherein, measuring body can be transformer central point earthing device, and particularly, transformer central point earthing device can be transformer central point ground connection steel plate.
In above-described embodiment of the application, as shown in Figure 2, current sensing means 10 comprises: be wrapped in the iron core winding on iron core 101, wherein, iron core 101 comprises the first sub-iron core and the second sub-iron core, particularly, as shown in Figure 3, one end of first sub-iron core is blind end, the other end is openend, the openend of the first sub-iron core is connected with the second sub-iron core, to form cavity in the inside of iron core 101, wherein, cavity is rectangular enclosure, measure body through rectangular enclosure, iron core 101 is made to produce electromagnetic induction with measurement body, and generate an electromagnetic field in iron core 101, iron core winding is wrapped on the first sub-iron core, for by obtaining ground current signal with the electromagnetic induction of electromagnetic field.
Particularly, current clamp shown in Fig. 3, the openend of the first sub-iron core comprises the first sub-openend and the second sub-openend, wherein, first sub-openend is connected by the first end of articulated elements with the second sub-iron core, under the state that the first sub-iron core and the second sub-iron core fasten, the second sub-openend is connected with the second end of the second sub-iron core, and the first sub-iron core and the second sub-iron core are fastened and connected and form iron core 101.
Wherein, the articulated elements in above-described embodiment can comprise elastic locking mechanism.Particularly, elastic locking mechanism uses spring to realize elastic locking.
Particularly, as shown in Figures 2 and 3, the the second sub-iron core be connected with the openend of first of current clamp the sub-iron core in above-described embodiment is opened, to open the rectangular enclosure of iron core 101, make to measure body through rectangular enclosure, then the first sub-iron core and the second sub-iron core are fastened, the inside of iron core 101 is made to form above-mentioned rectangular enclosure, then just can measure by current clamp the ground current signal measuring body, in measuring process, measure body as a winding, alternating current is had to flow through owing to measuring in body, iron core 101 can be responded to this alternating current and produce electromagnetism, then the iron core winding (this iron core winding is as Secondary Winding in measuring process) be wrapped on iron core 101 obtains ground current signal by electromagnetic induction, and export this ground current signal to DC component tripping device 30.
Wherein, the length of rectangular enclosure can be 50cm, and the width of rectangular enclosure can be 10cm, and wherein, as shown in Figure 3, the width of rectangular enclosure is also the A/F of the openend of the first sub-iron core.
Particularly, this current clamp is applied in the measurement of transformer central point ground current signal, as shown in Figures 2 and 3, first sub-iron core of this current clamp has openend, and the size forming cavity in iron core 101 inside matches with measurement body, thus can realize the measurement of the ground current signal to the wide cross section wire of transformer central point ground connection.
In the above embodiment of the present invention, DC component tripping device 30 can comprise: DC component separation circuit, be connected with the first output terminal of iron core winding, carry out current separation, to obtain DC component signal for the ground current signal exported the first output terminal of iron core winding; DC output end, is connected with DC component separation circuit, for output DC component signal; Ac output end, is connected with the second output terminal of iron core winding, for exporting ground current signal.Wherein, the ground current signal that ac output end exports is as ground current signal, although both comprised AC compounent signal in this ground current signal also comprise DC component signal, but in the follow-up process processed ac current signal, DC component wherein can't have impact to follow-up process.
Wherein, DC component tripping device 30 can also comprise: current suppling circuit, is connected with DC component separation circuit, for providing electric energy for DC component segregant circuit.
By above-described embodiment of the application, current clamp comprises can the iron core 101 of opening, the iron core winding be wrapped on iron core 101, DC component separation circuit and double output ends, iron core 101 and iron core winding can fit through electromagnetic induction and obtain the ground current signal measuring body, then the DC component in ground current signal is separated by DC component separation circuit, and direct current and AC compounent signal are exported respectively by double output ends, thus the alternating current can simultaneously measured in body and DC component.
In the above embodiment of the present invention, can be provided with handle in the outside of the blind end of the first sub-iron core, DC component tripping device 30 can be arranged on the inside of handle.DC component tripping device 30 can be arranged on the inside of handle, the volume of current clamp can be reduced, thus make carrying of current clamp more convenient.
In addition, can wrap insulate material in the outside of current sensing means 10, can security measurement be realized, can the safety of protection person well, reduce security incident.
Fig. 4 is the structural representation of the equipment for monitoring power quality according to the embodiment of the present invention, and equipment for monitoring power quality as shown in Figure 4 comprises current clamp 1.
Pass through the application, the iron core of the current sensing means of current clamp has the cavity matched with measurement body, make to produce electromagnetic induction when measuring when body passes the cavity of this iron core, current sensing means is made to be obtained the ground current signal measured in body by electromagnetic induction, then this ground current signal is carried out being separated of direct current and AC compounent by DC component tripping device, obtain and output DC component signal and AC compounent signal, solve the AC and DC component simultaneously cannot measuring high-power transformer centre-point earth steel plate in prior art, thus the problem of the research of transformer DC magnetic bias cannot be carried out according to the AC and DC component of transformer central point ground connection, achieve the synchro measure of ac current signal to transformer central point ground current and DC current signal, thus electric energy quality monitoring can be carried out according to the synchro measure data of alternating current-direct current in transformer central point ground current.
In the above embodiment of the present invention, equipment for monitoring power quality can also comprise: the first harvester 3, is connected with the ac output end of current clamp, for gathering ac current signal; Second harvester 5, is connected with the DC output end of current clamp, for gathering DC current signal.Wherein, the ac current signal that ac output end exports is above-mentioned ground current signal, although both comprised AC compounent signal in this ground current signal also comprise DC component signal, but in the follow-up process processed ac current signal, DC component wherein can't have impact to follow-up process.
Equipment for monitoring power quality in above-described embodiment can measure DC component.Wherein, the current signal collected can be carried out amperometry by the first harvester and the second harvester by the treating apparatus in equipment for monitoring power quality, particularly, amperometry comprises: analyze the DC current signal regularity of distribution on a timeline, the waveform of comparative analysis DC current signal and the waveform of ac current signal, comparative analysis is relative to the waveform of ac current signal of these monitoring point electric energy quality monitoring data and the waveform of DC current signal, and by obtaining the pests occurrence rule of direct-current component at this electrical network node to the comparative analysis result of the above-mentioned regularity of distribution and waveform, according to the correlativity of this pests occurrence rule researching DC bias phenomenon and quality of power supply event, and can while acquisition electric energy quality monitoring data, the generation of prediction direct-current component (DC magnetic biasing).
Particularly, as shown in Figure 4, the first harvester 3 is connected at the ac output end of current clamp, and connect the second harvester 5 at DC output end, first harvester 3 and the second harvester 5 gather ac current signal and the DC current signal of current clamp output respectively, and this ac current signal and DC current signal are applied in follow-up electric energy quality monitoring.
From above description, can find out, present invention achieves following technique effect: pass through the application, the iron core of the current sensing means of current clamp has the cavity matched with measurement body, make to produce electromagnetic induction when measuring when body passes the cavity of this iron core, current sensing means is made to be obtained the ground current signal measured in body by electromagnetic induction, then this ground current signal is carried out being separated of direct current and AC compounent by DC component tripping device, obtain and output DC component signal and AC compounent signal, solve the AC and DC component simultaneously cannot measuring high-power transformer centre-point earth steel plate in prior art, thus the problem of the research of transformer DC magnetic bias cannot be carried out according to the AC and DC component of transformer central point ground connection, achieve the synchro measure of ac current signal to transformer central point ground current and DC current signal, thus the research of transformer central point ground connection DC magnetic biasing and the monitoring of the quality of power supply can be carried out according to the synchro measure data of alternating current-direct current in transformer central point ground current.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a current clamp, is characterized in that, comprising:
Current sensing means, comprise iron core, described iron core has the cavity matched with measurement body, and when described measurement body produces electromagnetic induction through during described cavity, described current sensing means obtains the ground current signal in described measurement body by described electromagnetic induction; Described current sensing means comprises: be wrapped in the iron core winding on described iron core, wherein, described iron core comprises the first sub-iron core and the second sub-iron core, wherein, one end of described first sub-iron core is blind end, and the other end is openend, the openend of described first sub-iron core is connected with the second sub-iron core, to form described cavity in the inside of described iron core, wherein, described cavity is rectangular enclosure; Described iron core winding is wrapped on described first sub-iron core; The openend of described first sub-iron core comprises the first sub-openend and the second sub-openend, wherein, described first sub-openend is connected by the first end of articulated elements with described second sub-iron core, under the state that described first sub-iron core and described second sub-iron core fasten, described second sub-openend is connected with the second end of described second sub-iron core, and described first sub-iron core and described second sub-iron core are fastened and connected and form described iron core;
DC component tripping device, is connected with described current sensing means, for described ground current signal is carried out AC and DC current separation, to obtain and output DC component signal and AC compounent signal,
Wherein, the width of described rectangular enclosure is the A/F of the openend of described first sub-iron core, and described measurement body is transformer central point earthing device, and described transformer central point earthing device is transformer central point ground connection steel plate.
2. current clamp according to claim 1, is characterized in that, described DC component tripping device comprises:
DC component separation circuit, is connected with the first output terminal of described iron core winding, carries out current separation, to obtain DC component signal for the ground current signal exported the first output terminal of described iron core winding;
DC output end, is connected with described DC component separation circuit, for exporting described DC component signal;
Ac output end, is connected with the second output terminal of described iron core winding, for exporting described ground current signal.
3. current clamp according to claim 2, is characterized in that, described DC component tripping device comprises:
Current suppling circuit, is connected with described DC component separation circuit, for providing electric energy for described DC component separation circuit.
4. current clamp according to claim 1, is characterized in that, described articulated elements comprises elastic locking mechanism.
5. current clamp according to claim 1, is characterized in that, be provided with handle in the outside of the blind end of described first sub-iron core, described DC component tripping device is arranged on the inside of described handle.
6. current clamp according to claim 1, is characterized in that, at the outer wrap insulating material of described current sensing means.
7. an equipment for monitoring power quality, is characterized in that, comprises the current clamp in claim 1 to 6 described in any one.
8. equipment for monitoring power quality according to claim 7, is characterized in that, described equipment for monitoring power quality also comprises:
First harvester, is connected with the ac output end of described current clamp, for gathering ac current signal;
Second harvester, is connected with the DC output end of described current clamp, for gathering DC current signal.
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| CN201210523532.4A CN102981035B (en) | 2012-12-07 | 2012-12-07 | Current clamp and power quality monitoring device |
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| CN201210523532.4A CN102981035B (en) | 2012-12-07 | 2012-12-07 | Current clamp and power quality monitoring device |
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| CN102981035A CN102981035A (en) | 2013-03-20 |
| CN102981035B true CN102981035B (en) | 2015-04-22 |
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| CN105425003A (en) * | 2015-11-16 | 2016-03-23 | 国网河南省电力公司平顶山供电公司 | Two-way information interaction method and two-way information interaction device for watt-hour meter boxes of residents |
| CN112362953A (en) * | 2020-09-16 | 2021-02-12 | 昆明理工大学 | Direct current bias current detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202975120U (en) * | 2012-12-07 | 2013-06-05 | 宁夏电力公司电力科学研究院 | Current clamp and electric energy quality monitoring device |
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| JPH11337591A (en) * | 1998-05-28 | 1999-12-10 | Tempearl Ind Co Ltd | Direct current detecting device |
| CN201449415U (en) * | 2009-07-13 | 2010-05-05 | 珠海市澳特尔测控仪表有限公司 | Alternating-current/direct-current leakage current sensor |
| JP5625525B2 (en) * | 2010-06-18 | 2014-11-19 | 富士電機株式会社 | Current detector |
| JP5698484B2 (en) * | 2010-09-27 | 2015-04-08 | 日置電機株式会社 | Current measuring device |
| CN102279299A (en) * | 2011-06-30 | 2011-12-14 | 保定供电公司 | Special pincer-shaped electric universal meter |
| CN102759681A (en) * | 2012-06-28 | 2012-10-31 | 河南省电力公司信阳供电公司 | Transformer core ground fault monitoring device |
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