CN202649374U - Inputting or detecting device based on capacitive sensing non-contact signals - Google Patents

Inputting or detecting device based on capacitive sensing non-contact signals Download PDF

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Publication number
CN202649374U
CN202649374U CN 201220330273 CN201220330273U CN202649374U CN 202649374 U CN202649374 U CN 202649374U CN 201220330273 CN201220330273 CN 201220330273 CN 201220330273 U CN201220330273 U CN 201220330273U CN 202649374 U CN202649374 U CN 202649374U
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cable
input
signal
detects
capacitor
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CN 201220330273
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贾晓刚
吴成才
何少林
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Zhejiang Tuwei Electricity Technology Co Ltd
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ZHEJIANG TUWEI POWER TECHNOLOGY Co Ltd
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Abstract

An inputting or detecting device based on capacitive sensing non-contact signals comprises a to-be-detected cable, an alternating current signal generator (1), a capacitance coupling sensor (5), a current transformer (6), a signal receiver and a connection conductive wire. Alternating current signals are input to a metal layer by being connected with a capacitor in series or are input to the metal layer through secondary or multiple coupling induction of a mutual inductor, the metal layer is arranged at target cable source ends of a group of cables, and the far end of the to-be-detected cable produces current of the metal layer inside the cables through the capacitance coupling sensor (5) and the current transformer (6) in coupling mode, and if phases of the alternating current signals output in coupling mode are the same as phases of input end alternating current signals, the cable containing the output alternating current signals is a target cable. The inputting or detecting device well resolves the problems of cable identification and seeking detection on the condition that the single end of the cable is in ground connection and ground connection is lacked or undesirable, is applied to the conditions of operation and outage of the cable, is convenient to wire, achieves cable accurate identification with low cost, and improves cable identification efficiency and accuracy degree.

Description

A kind of based on the input of capacitance sensing non-contact signal or the device that detects
Technical field
The utility model relates to the electric system detection technique, and is particularly a kind of based on the input of capacitance sensing non-contact signal or the device that detects.Be applicable to carry out the technical field that identification was surveyed or detected to the cable locating track under electric wire operation or the off-position, be particluarly suitable for power distribution or feeder cable and in ground connection disappearance or bad or single-end earthed situation, cable sought track and survey and detect identification.
Background technology
Power cable plays a part more and more important in present society, and it is usually used in transmission and distributes electric energy.In the city, the detection of cable and detection are the important technical of carrying out effective management.But because the change of a large amount of earth's surfaces buildings in the urban construction, and power cable ground connection disappearance or the abominable operating mode such as bad, give the detection of cable and detect identification and brought larger difficulty.
Existing power cable recognition methods, pulse polarity method, sound signal method, voltage method and electric-resistivity method all can only be identified stoppage in transit cable or the good cable of cable two end ground connection, and Granted publication number is: the method that the patent of invention of CN 101603995 B proposes a kind of cable detecting device and realizes detecting.Controllable switch element is adopted in this invention, turns off after the moment connection continuously by user side or end at power line, produces in the line a continuous momentary pulse electric current, and by following the trail of this pulse current realization cable detection.Publication number is: the patent of invention of CN 1564006A proposes a kind of recognition methods of power cable.This invention is with the external low-voltage alternating current power supply of cable to be identified one end, switch and reometer; the other end ground connection of cable; the induction installation of one current detecting instrument is set with or is fitted on the cable of working position; by draw, splice grafting is at the switch of cable one end; observe on the current detecting instrument whether current signal that flow through simultaneously with reometer and equal-sized is arranged; judge that whether with the cable of external impressed current be same cable with the cable of working position, it equally is an end ground connection that this patent of invention requires the core of cable or external protection to have at least.Although application publication number is: a kind of method of injecting asymmetric square waves signal realization cable ONLINE RECOGNITION that adopts that the patent of invention of CN 102331545A proposes can be implemented in safety under the condition of work of not stopping transport, detects target cable reliably, requires the cable two-terminal-grounding good.In actual condition, there is in a large number imperfect earth, without situations such as ground connection, to relying on the complete loops Injection Signal and detect the above-mentioned technical method of identification, the defective that existence can't detection and Identification.
The utility model content
In order to address the above problem, it is a kind of based on the input of capacitance sensing non-contact signal or the device that detects that the utility model provides.According to of the present utility model a kind of based on the input of capacitance sensing non-contact signal or the device that detects, the method that adopts the input of capacitance sensing non-contact signal or detect has realized the on-line operation of cable and cable is single-ended or two-terminal-grounding disappearance or unfavorable condition under accurate identification and seek track and survey, improved the adaptability of various operating modes.And the utility model easy-to-connect, equipment are small and exquisite, simple to operate, realize that with low cost cable accurately identifies, and save a large amount of manpower and materials, have improved efficient and the accuracy of cable identification.
According to of the present utility model a kind of based on the input of capacitance sensing non-contact signal or the device that detects, comprise tested cable, AC signal generator, capacitive coupled sensors, current transformer, signal receiver and connection wire be connectedCapacitor device and tested cable are close to and approaching source (also claiming signal input part) or the far-end (also claiming the input end) that is identified target cable.AC signal source, capacitive coupled sensors, current transformer, cable interior metal layer, signal receiver and the earth consist of a loop, and (metal level of target cable source is inputted or be input to by capacitor-coupled by the mutual inductor coupling first again to AC signal and capacitor's seriesu for this loop and each equipment sequencing or AC signal input form.) irrelevant.
Preferably: described capacitive coupled sensors is comprised of the metal level of metal device and cable the inside, and the metal level of cable the inside and the metal device of outside consist of capacitor.
Preferably: described capacitive means is curved-surface structure near the structure of cable face.
Preferably: described capacitor device material is metal material.
Preferably: described capacitor device material is copper.
Preferably: the area of extra capacitor device and cable leave the distance be adjustable.
Preferably: form the material of capacitor device around the local envelopment of cable circumference outer protective sleeve.
Preferably: the material that forms capacitor device surrounds entirely around cable circumference outer protective sleeve.
Preferably: described current transformer is split core type current transformer.
Preferably: described current transformer adopts silicon steel sheet material.
Preferably: described current transformer adopts the permalloy material.
Preferably: described tested cable is one or more cable.
Preferably: described cable interior metal layer is plain conductor.
According to of the present utility model a kind of based on the input of capacitance sensing non-contact signal or the device that detects, AC signal generator produces AC signal, the input of AC signal and capacitor's seriesu or by the mutual inductor secondary or repeatedly inductive coupling input the source of target cable in one group of cable, be delivered to the far-end of cable by this cable interior metal layer.Be coupled out respectively AC signal on the cable interior metal layer by capacitive coupled sensors or current transformer at the other end of cable, and identify and detection of a target cable by phase place and the intensity of the detected output AC signal that respectively is coupled of receiver.The cable at the output AC signal place of the AC signal of coupling output and the AC signal same-phase of source and intensity maximum is target cable, and the AC signal of other non-target cable is a little less than the signal intensity of anti-phase and signal intensity ratio target cable.
Preferably: by setting different capacitor parameters, realize the blocking-up direct current signal, the testing goal of conducting AC signal.
Preferably: under the high voltage position needs non-contacting situation, realize effective input of AC signal or detect.
Preferably: the target cable of detection be single-ended or two end ground connection good, two-terminal-grounding disappearance or bad state or single-end earthed, lack, bad any situation.
Preferably: do not need to change original cable status, do not need to disconnect being connected between cable two ends and equipment for power transmission and distribution, simple input exchange signal source forms the electric circuit inspection closed-loop path, is applicable to the state of the normal operation of target cable and outage.
Preferably: target cable other cables in addition are in any ground state in one group of cable does not affect testing result.
Preferably: other cables in one group of cable beyond the target cable are in the charging operation state or power down mode does not affect testing result.
Preferably: the input of AC signal and capacitor's seriesu or by the mutual inductor secondary or repeatedly inductive coupling be input to the metal level of target cable source.
Preferably: the utility model is applied to that the cable locating track is surveyed and detects the intensity of seeking the track pattern and seek track and survey and divide equally and seek track and survey.
A kind of based on the input of capacitance sensing non-contact signal or the device that detects, be applied to cable identification and seek the track detection, especially be fit to the operation cable and single-end earthed or ground connection disappearance or bad state, this device comprises signal generator, capacitive coupled sensors, current transformer, signal receiver, connection wire etc.Realize identification by following step:
1, capacitive means is close to the tested cable source end surfaces of target, metal level and the outside metal device of cable the inside form a capacitor.The material that forms capacitor device can be according to actual field operating mode selection suitable width and around the full encirclement of cable circumference outer protective sleeve or local envelopment cable.
2, external communication signal source one termination capacitor apparatus, an other termination the earth or electric capacity directly connect the earth by wire, the input of AC signal and capacitor's seriesu or by the mutual inductor secondary or repeatedly inductive coupling input the source of target cable in one group of cable, be delivered to far-end by this cable interior metal layer.
3, detect the output AC signal of each cable by mutual inductor or capacitor device or this two kinds of equipment dual-purposes and signal receiver at far-end, comprehensively identify the measured target cable by phase place and signal intensity, can get the far-end that same-phase and signal maximum are target cable according to circuit theory, other cables then are inversion signals if any signal.
The theoretical foundation of this method is as follows:
A. the capacitance of capacitor is directly proportional with the area S of pole plate, and being inversely proportional to apart from d between pole plate; Capacitive reactance and condenser capacity, frequency are inversely proportional to.The area of appropriate change extra capacitor device will change capacitance, changes capacitive reactance thereupon, has also just changed remote signaling intensity.
B. Kirchhoff's current law (KCL): for any one node or the closing face in any one lumped-parameter circuit, at any time, all the branch current algebraic sum by this node or closing face equal zero.
Have such scheme as seen, the input of AC signal and capacitor's seriesu or by the mutual inductor secondary or repeatedly inductive coupling input the metal level of target cable source in one group of cable.Be coupled out respectively electric current on the cable interior metal layer by capacitor or mutual inductor at the far-end of this group cable, and detect phase place and the intensity of the AC signal of each coupling output by receiver, select a phase place and other single spin-echos or be target cable with the cable at the synchronous coupling output signal of input end AC signal place.Simultaneously the utility model also is applied to the cable locating track and surveys and detect the intensity of seeking the track pattern and seek track and survey and divide equally and seek track and survey.
The utility model solve well cable single-end earthed by electric capacity noncontact coupling or ground connection disappearance or bad situation under cable identification and cable seek the track detection, and do not need to disconnect being connected between cable two ends and equipment for power transmission and distribution.Simplify the operation of cable identification, improved accuracy.The suitable equally target cable of the utility model method is in the identification under the off-position, and the utility model not only is fit to the identification of multi-cable and seeks track and survey, and is applicable to the identification of unit cable and seeks the track detection.
Compared with prior art, the utlity model has simplicity of design rationally, complex working condition strong adaptability, accuracy rate be high, to cable identification with seek the track field of detecting and have good use value.
Description of drawings
Fig. 1 be according to of the present utility model a kind of based on the capacitance sensing non-contact signal input or the device that detects at the cable synoptic diagram of a preferred embodiment of the proving installation in the situation single-end earthed.
Fig. 2 be according to of the present utility model a kind of based on the capacitance sensing non-contact signal input or the synoptic diagram of a preferred embodiment of the proving installation of device under cable two end ground connection deletion conditions that detect.
Fig. 3 be shown in Figure 1 a kind of based on the capacitance sensing non-contact signal input or the device that detects at the cable circuit model synoptic diagram of a preferred embodiment of the proving installation in the situation single-end earthed.
Fig. 4 be shown in Figure 2 a kind of based on the capacitance sensing non-contact signal input or the circuit model synoptic diagram of a preferred embodiment of the proving installation of device under cable two end ground connection deletion conditions that detect.
Fig. 5 is according to a kind of input or two above cables of device of detecting wiring schematic diagram of a preferred embodiment of situation proving installation single-end earthed based on the capacitance sensing non-contact signal of the utility model.
Fig. 6 is a kind of input or two above cables of device of detecting principle schematic of a preferred embodiment of situation proving installation single-end earthed based on the capacitance sensing non-contact signal shown in Figure 5.
Fig. 7 be according to the utility model a kind of based on the capacitance sensing non-contact signal input or the wiring schematic diagram of a preferred embodiment of two above cable two end ground connection deletion condition proving installations of device of detecting.
Fig. 8 be shown in Figure 7 a kind of based on the capacitance sensing non-contact signal input or the principle schematic of a preferred embodiment of two above cable two end ground connection deletion condition proving installations of device of detecting.
Fig. 9 is according to a kind of input or the signal source of the device that detects input condition synoptic diagram that repeatedly is coupled based on the capacitance sensing non-contact signal of the utility model.
Among the figure, 1. AC signal generator, 2. cable core, 3. cable armouring, 4. oversheath, 5. capacitive coupled sensors, 6. current transformer, 7. capacitive means connect wire, AC. AC signal generator, C. capacitive coupled sensors, R. line resistance and stake resistance and, CT. current transformer, L1. cable 1, L2. cable 2, L3. cable 3, R1. cable L1 line resistance, R2. cable L2 line resistance, R3 cable L3 line resistance, R4. ground resistance.
Embodiment
Embodiment 1:
As shown in Figure 5, a kind of input or 2 above cables of device of detecting proving installation in the situation single-end earthed based on the capacitance sensing non-contact signal.A termination the earth of AC signal generator (1), stake resistance is less than 4 ohm, an other termination capacitor apparatus, capacitor device parcel or near the source of target cable.The input of AC signal and capacitor's seriesu or by the mutual inductor secondary or repeatedly inductive coupling input the metal level of target cable source in one group of cable, far-end Current Transformer (6) sampling of this group cable, current transformer (6) sampling output two ends connect signal receiver.The phase place of the output AC signal that signal receiver shows is identical with the phase place of source AC signal to be exactly target cable, otherwise is not target cable.
Embodiment 2:
As shown in Figure 7, a kind of based on the capacitance sensing non-contact signal input or the proving installation under 2 above cable two end ground connection deletion conditions of device of detecting.A termination the earth of AC signal generator (1), stake resistance is less than 4 ohm, an other termination capacitor apparatus, capacitor device parcel or near the source of target cable.The input of AC signal and capacitor's seriesu or by the mutual inductor secondary or repeatedly inductive coupling input the metal level of target cable source in one group of cable.The far-end of this group cable is responded to sampling with the capacitor device parcel or near cable, and capacitor device connects signal receiver, the other termination the earth of signal receiver, and stake resistance is less than 4 ohm.The phase place that signal receiver shows is identical with the phase place of source AC signal to be exactly target cable, otherwise is not target cable.
According to a kind of input or the technical scheme of the device that detects combination in any of comprising the above each several part based on the capacitance sensing non-contact signal of the present utility model.

Claims (12)

1. one kind based on the input of capacitance sensing non-contact signal or the device that detects, comprise tested cable, signal receiver be connected wire, it is characterized in that: also comprise AC signal generator, the capacitive coupled sensors summation current transformer, capacitor device and tested cable are close to and approaching source (signal input part) or the far-end (test side) that is identified target cable, the AC signal source, capacitive coupled sensors, current transformer, cable interior metal layer, signal receiver and the earth consist of a loop, this loop and each equipment sequencing are irrelevant, and the metal level of target cable source is inputted or be input to by capacitor-coupled by the mutual inductor coupling first again to AC signal and capacitor's seriesu.
2. as claimed in claim 1 a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: described capacitive coupled sensors is comprised of the metal level of metal device and cable the inside, and the metal level of cable the inside and the metal device of outside consist of capacitor.
3. as claimed in claim 2 a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: described capacitive means is curved-surface structure near the structure at cable face place.
4. as each is described a kind of based on the input of capacitance sensing non-contact signal or the device that detects among the claim 1-3, it is characterized in that: described capacitor device material is metal material.
5. as claimed in claim 4 a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: described capacitor device material is copper.
As among the claim 1-3 each or 5 described a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: the area of extra capacitor device and cable to leave distance be adjustable.
7. as claimed in claim 6 a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: form the material of capacitor device around cable circumference outer protective sleeve local envelopment cable.
8. as claimed in claim 6 a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: the material that forms capacitor device surrounds cable entirely around cable circumference outer protective sleeve.
As among the claim 1-3 each or 5 or 7 or 8 described a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: described current transformer is split core type current transformer.
10. as claimed in claim 9 a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: described current transformer adopts silicon steel sheet material.
11. as claimed in claim 9 a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: described current transformer adopts the permalloy material.
12. as among the claim 1-3 each or 5 or 7 or 8 or 10 or 11 described a kind of based on the input of capacitance sensing non-contact signal or the device that detects, it is characterized in that: described tested cable is one or more cable.
CN 201220330273 2012-07-10 2012-07-10 Inputting or detecting device based on capacitive sensing non-contact signals Active CN202649374U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102735994A (en) * 2012-07-10 2012-10-17 浙江图维电力科技有限公司 Method and device for inputting or detecting non-contact signals based on capacitor sensing
CN104714157A (en) * 2015-02-04 2015-06-17 国家电网公司 High-sensitivity spiral capacity coupling sensor and installing method thereof
WO2016065574A1 (en) * 2014-10-30 2016-05-06 3M Innovative Properties Company Capacitive temperature sensing for electrical conductor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102735994A (en) * 2012-07-10 2012-10-17 浙江图维电力科技有限公司 Method and device for inputting or detecting non-contact signals based on capacitor sensing
CN102735994B (en) * 2012-07-10 2016-05-25 浙江图维科技股份有限公司 A kind of input based on capacitance sensing non-contact signal or the method and apparatus detecting
CN107076621B (en) * 2014-10-30 2020-12-04 3M创新有限公司 Capacitive temperature sensing of electrical conductors
WO2016065574A1 (en) * 2014-10-30 2016-05-06 3M Innovative Properties Company Capacitive temperature sensing for electrical conductor
CN107076621A (en) * 2014-10-30 2017-08-18 3M创新有限公司 The capacitance temperature sensing of electric conductor
US10458860B2 (en) 2014-10-30 2019-10-29 3M Innovative Properties Company Capacitive temperature sensing for electrical conductor
CN104714157B (en) * 2015-02-04 2018-11-06 国家电网公司 A kind of capacitive coupled sensors and installation method of high sensitivity helical form arrangement
CN104714157A (en) * 2015-02-04 2015-06-17 国家电网公司 High-sensitivity spiral capacity coupling sensor and installing method thereof

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GR01 Patent grant
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CP03 Change of name, title or address

Address after: Hangzhou City, Zhejiang province Yuhang District 310012 West Street Wuchang No. 998 building 4 room 412

Patentee after: ZHEJIANG TUWEI ELECTRICITY TECHNOLOGY CO., LTD.

Address before: 4, Hangzhou, Zhejiang Province, Xihu District West Road, No. 310012, building 20

Patentee before: Zhejiang Tuwei Power Technology Co., Ltd.

C56 Change in the name or address of the patentee