CN105116300A - Downhole cable insulation online monitoring system - Google Patents

Downhole cable insulation online monitoring system Download PDF

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Publication number
CN105116300A
CN105116300A CN201510507642.5A CN201510507642A CN105116300A CN 105116300 A CN105116300 A CN 105116300A CN 201510507642 A CN201510507642 A CN 201510507642A CN 105116300 A CN105116300 A CN 105116300A
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China
Prior art keywords
cable
low
signal
frequency
insulation
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Pending
Application number
CN201510507642.5A
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Chinese (zh)
Inventor
宋剑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUZHOU NEW RICH SAVING TECHNOLOGY CO LTD
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SUZHOU NEW RICH SAVING TECHNOLOGY CO LTD
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Priority to CN201510507642.5A priority Critical patent/CN105116300A/en
Publication of CN105116300A publication Critical patent/CN105116300A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a downhole cable insulation online monitoring system comprising a low-frequency voltage source, first to fourth inductors, a Hall current sensor, a signal conditioning circuit, an A/D converter, a processing module, a display module, an alarm, and a communication module. The processing module comprises a processing unit and a determining unit. The low-frequency voltage source is connected with one end of the first inductor. The other end of the first inductor is connected with one end of each of the second to the fourth inductor. The other end of the second inductor, the other end of the third inductor, and the other end of the fourth inductor are connected with three wires in a cable, respectively. The Hall current sensor sleeves the cable and is successively connected with the signal conditioning circuit, the A/D converter, the processing unit, and the display module. The communication module is connected with the processing unit. The processing unit is successively connected with the determining unit and the alarm. The downhole cable insulation online monitoring system may online monitor the insulation state of the cable in real time and timely notify downhole and ground workers so as to guarantee operation safety, prevent economic losses, and achieve high sensitivity and low errors.

Description

A kind of downhole cable insulated on-line monitoring system
Technical field
The present invention relates to Electric Power Equipment Insulation monitoring technical field, particularly a kind of downhole cable insulated on-line monitoring system.
Background technology
Along with developing rapidly of the new forms of energy such as wind-power electricity generation, photovoltaic generation industry, the quantity of power cable and length are also increasing rapidly.Power cable is widely used in industrial and mining enterprises, the department such as railway and urban electricity supply, wherein colliery is that cable uses rich and influential family due to the particular surroundings of underground coal mine, cable is in operational process, because of the infiltration gradually of mechanical damage switching overvoltage and moisture, under the long term of electric field, cable inside there will be the phenomenon of shelf depreciation, aging and insulation resistance is caused to decline as determined not in time and disengagement failure circuit, electric power system can be made to there is great potential safety hazard, gas and coal dust explosion can be caused by starting arc time serious, jeopardize the safety of people and equipment; Because mine cable running environment is severe, cable leading electricity gas probability of failure is comparatively large, and accounting for about 2/3 of accident of power supply sum, is the one of the main reasons causing the severe and great casualty such as gas, coal dust explosion.
In prior art, there is regular visit mode to the Insulation monitoring of power cable, namely regularly build pilot system, offline inspection is carried out to the state of insulation of power cable.But this mode exists following shortcoming: need power cable out of service, not only affect the continuity of power supply, and due to the difference of test condition and actual motion condition, the insulation hidden danger of power cable can not be detected strictly according to the facts; Polling period is long, can not the insulation hidden danger of Timeliness coverage power cable.The cable insulation conventional monitoring methods also had mostly is offline inspection, and these methods are all carried out under power down mode, are difficult to judge the operating dielectric level of cable in time, cannot reflect cable running status continuously.In addition, offline inspection blindness is very large, and waste of manpower, material resources, even some off-line checking method also can destroy cable insulation.
Existing multiple on-line monitoring method, such as DC component method, power frequency method etc.Still there is lower column defects in these methods: DC component method, easily by the impact of on-the-spot stray current, causes low current signal to extract difficulty, is difficult to carry out in engineering reality; Power frequency method is in electrical network, add the low-voltage ac voltage consistent with line voltage frequency, and this method gets final product the insulation parameter (insulation resistance and distributed capacitance) of detection streamer without additional supply, and the method is simple, but the low error of sensitivity is larger.
Application number is the mine high-voltage cable state of insulation on-line monitoring system of 201410225812.6, although which overcome the shortcoming that existing conventional monitoring methods cannot be applied in neutral by arc extinction coil grounding electric power system, it can real time on-line monitoring cable insulation state, but sensitivity is not high, error is larger.
How solving the deficiencies in the prior art is major issues that Electric Power Equipment Insulation monitoring technical field needs solution badly.
Summary of the invention
Technical matters to be solved by this invention provides a kind of downhole cable insulated on-line monitoring system to overcome the deficiencies in the prior art, and native system can to the state of insulation real time on-line monitoring of cable, the continuity that raising colliery powers, reliability and security.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
According to a kind of downhole cable insulated on-line monitoring system that the present invention proposes, comprise low-frequency voltage source, first to fourth inductance, Hall current sensor, signal conditioning circuit, A/D converter, processing module, display module, alarm and communication module, processing module comprises processing unit and judging unit; Wherein,
Low-frequency voltage source is used for output low frequency ac voltage signal, and low-frequency ac voltage signal injects cable after the first inductance, the second to four inductance, then forms low-frequency current loop with cable insulation against ground resistance and the earth;
Hall current sensor, for exporting the current signal collected to signal conditioning circuit;
Signal conditioning circuit, for by output low frequency current signal after current signal trap, filtering, amplification, rectification to A/D converter;
A/D converter, exports processing unit to for converting low-frequency current signal to digital signal;
Processing unit, for carrying out treatment and analysis to the digital signal received, obtaining the insulation against ground resistance of cable and being exported to judging unit, display module, communication module;
Judging unit, for judging that then output alarm signal is reported to the police to alarm when the insulation against ground resistance of cable is less than default warning insulation resistance;
Display module, for showing the insulation against ground resistance of cable;
Communication module, for exporting outside ground monitoring center to by the insulation against ground resistance of cable.
As the further prioritization scheme of a kind of downhole cable insulated on-line monitoring system of the present invention, described signal conditioning circuit comprises the trap circuit, filtering circuit, amplifying circuit and the rectification circuit that connect successively.
As the further prioritization scheme of a kind of downhole cable insulated on-line monitoring system of the present invention, described central processing unit is AT89S52 type single-chip microcomputer.
As the further prioritization scheme of a kind of downhole cable insulated on-line monitoring system of the present invention, described Hall current sensor is CE-IJ03-52BS2 Hall current sensor.
As the further prioritization scheme of a kind of downhole cable insulated on-line monitoring system of the present invention, the frequency of described low-frequency ac voltage signal is 10Hz.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
(1) native system can to the state of insulation real time on-line monitoring of cable, the continuity that raising colliery powers, reliability and security;
(2) can notify that down-hole and ground staff process in time, thus ensure security of operation, avoid economic loss;
(3) native system is highly sensitive and error is little.
Accompanying drawing explanation
Fig. 1 is present system schematic diagram.
Reference numeral in figure is interpreted as: 1-low-frequency voltage source, 2-Hall current sensor, 3-cable.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
Present system schematic diagram as shown in Figure 1, a kind of downhole cable insulated on-line monitoring system, comprise low-frequency voltage source 1, first to fourth inductance, Hall current sensor 2, signal conditioning circuit, A/D converter, processing module, display module, alarm and communication module, processing module comprises processing unit and judging unit; Wherein,
Low-frequency voltage source is connected with one end of the first inductance, the other end of the first inductance is connected respectively with one end of the second to four inductance, the other end of the second to four inductance is connected respectively with three wires in cable 3 respectively, Hall current sensor is enclosed within cable, Hall current sensor is connected successively with signal conditioning circuit, A/D converter, processing unit, display module, communication module is connected with processing unit, and processing unit is connected successively with judging unit, alarm;
Low-frequency voltage source is used for output low frequency ac voltage signal, and low-frequency ac voltage signal injects cable after the first inductance, the second to four inductance, then forms low-frequency current loop with cable insulation against ground resistance and the earth;
Hall current sensor, for exporting the current signal collected to signal conditioning circuit;
Signal conditioning circuit, for by output low frequency current signal after current signal trap, filtering, amplification, rectification to A/D converter;
A/D converter, exports processing unit to for converting low-frequency current signal to digital signal;
Processing unit, for carrying out treatment and analysis to the digital signal received, obtaining the insulation against ground resistance of cable and being exported to judging unit, display module, communication module;
Judging unit, for judging that then output alarm signal is reported to the police to alarm when the insulation against ground resistance of cable is less than default warning insulation resistance;
Display module, for showing the insulation against ground resistance of cable;
Communication module, for exporting outside ground monitoring center to by the insulation against ground resistance of cable.
Described signal conditioning circuit comprises the trap circuit, filtering circuit, amplifying circuit and the rectification circuit that connect successively.
Described central processing unit is AT89S52 type single-chip microcomputer.
Described Hall current sensor is CE-IJ03-52BS2 Hall current sensor.
The frequency of described low-frequency ac voltage signal is 10Hz.
The present invention adopts Low frequency signal injection method, and the neutral point through three-phase inductor injects a low-frequency ac signal voltage to tested cable, by detecting the on-line monitoring of AC signal current realization to cable insulation; The method can detect the AC impedance of cable electrical network, and the D.C. isolation resistance detected than additional dc power supply method is closer to the cable insulation situation of reality; In addition, there is the little advantage of highly sensitive error compared with power frequency method.The Low frequency signal injection method that this system adopts overcomes additional dc power supply method can not the deficiency of detection streamer distributed capacitance over the ground; It is little that problem the method that error is large has metrical error, the feature that accuracy is high.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention for this reason, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.

Claims (5)

1. a downhole cable insulated on-line monitoring system, it is characterized in that, comprise low-frequency voltage source, first to fourth inductance, Hall current sensor, signal conditioning circuit, A/D converter, processing module, display module, alarm and communication module, processing module comprises processing unit and judging unit; Wherein,
Low-frequency voltage source is used for output low frequency ac voltage signal, and low-frequency ac voltage signal injects cable after the first inductance, the second to four inductance, then forms low-frequency current loop with cable insulation against ground resistance and the earth;
Hall current sensor, for exporting the current signal collected to signal conditioning circuit;
Signal conditioning circuit, for by output low frequency current signal after current signal trap, filtering, amplification, rectification to A/D converter;
A/D converter, exports processing unit to for converting low-frequency current signal to digital signal;
Processing unit, for carrying out treatment and analysis to the digital signal received, obtaining the insulation against ground resistance of cable and being exported to judging unit, display module, communication module;
Judging unit, for judging that then output alarm signal is reported to the police to alarm when the insulation against ground resistance of cable is less than default warning insulation resistance;
Display module, for showing the insulation against ground resistance of cable;
Communication module, for exporting outside ground monitoring center to by the insulation against ground resistance of cable.
2. a kind of downhole cable insulated on-line monitoring system according to claim 1, is characterized in that, described signal conditioning circuit comprises the trap circuit, filtering circuit, amplifying circuit and the rectification circuit that connect successively.
3. a kind of downhole cable insulated on-line monitoring system according to claim 1, is characterized in that, described central processing unit is AT89S52 type single-chip microcomputer.
4. a kind of downhole cable insulated on-line monitoring system according to claim 1, is characterized in that, described Hall current sensor is CE-IJ03-52BS2 Hall current sensor.
5. a kind of downhole cable insulated on-line monitoring system according to claim 1, is characterized in that, the frequency of described low-frequency ac voltage signal is 10Hz.
CN201510507642.5A 2015-08-19 2015-08-19 Downhole cable insulation online monitoring system Pending CN105116300A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510507642.5A CN105116300A (en) 2015-08-19 2015-08-19 Downhole cable insulation online monitoring system

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Application Number Priority Date Filing Date Title
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Publications (1)

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CN105116300A true CN105116300A (en) 2015-12-02

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106291109A (en) * 2016-07-27 2017-01-04 四川欧伦电气设备有限公司 A kind of insulation continuous detection apparatus
CN106405348A (en) * 2016-08-30 2017-02-15 合肥智博电气有限公司 Electric cable insulation detection apparatus collection system
CN106555603A (en) * 2016-11-15 2017-04-05 江苏智石科技有限公司 A kind of Control System of Tunnel Ventilation based on signal amplification circuit
CN106640169A (en) * 2016-11-15 2017-05-10 江苏智石科技有限公司 Tunnel ventilating control system based on WIFI
CN107035397A (en) * 2016-11-15 2017-08-11 江苏智石科技有限公司 A kind of Control System of Tunnel Ventilation based on stabilized power source

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090108347A (en) * 2008-04-11 2009-10-15 주식회사 개명메디칼 Insulation System of Medical Equipment
CN103135031A (en) * 2012-12-31 2013-06-05 中国矿业大学 Coal mine grid system insulation state monitoring method
CN203688734U (en) * 2014-01-16 2014-07-02 安徽恒源煤电股份有限公司 Insulating property monitoring system of mining high-voltage grid
CN103995220A (en) * 2014-05-27 2014-08-20 太原理工大学 Mining high-voltage cable insulation state online monitoring system
CN203929973U (en) * 2014-05-13 2014-11-05 平顶山天安煤业股份有限公司 A kind of down-hole power cable insulation monitoring device
CN104133114A (en) * 2014-07-29 2014-11-05 李磊 Insulation parameter detecting method for mine low-voltage cable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090108347A (en) * 2008-04-11 2009-10-15 주식회사 개명메디칼 Insulation System of Medical Equipment
CN103135031A (en) * 2012-12-31 2013-06-05 中国矿业大学 Coal mine grid system insulation state monitoring method
CN203688734U (en) * 2014-01-16 2014-07-02 安徽恒源煤电股份有限公司 Insulating property monitoring system of mining high-voltage grid
CN203929973U (en) * 2014-05-13 2014-11-05 平顶山天安煤业股份有限公司 A kind of down-hole power cable insulation monitoring device
CN103995220A (en) * 2014-05-27 2014-08-20 太原理工大学 Mining high-voltage cable insulation state online monitoring system
CN104133114A (en) * 2014-07-29 2014-11-05 李磊 Insulation parameter detecting method for mine low-voltage cable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106291109A (en) * 2016-07-27 2017-01-04 四川欧伦电气设备有限公司 A kind of insulation continuous detection apparatus
CN106405348A (en) * 2016-08-30 2017-02-15 合肥智博电气有限公司 Electric cable insulation detection apparatus collection system
CN106555603A (en) * 2016-11-15 2017-04-05 江苏智石科技有限公司 A kind of Control System of Tunnel Ventilation based on signal amplification circuit
CN106640169A (en) * 2016-11-15 2017-05-10 江苏智石科技有限公司 Tunnel ventilating control system based on WIFI
CN107035397A (en) * 2016-11-15 2017-08-11 江苏智石科技有限公司 A kind of Control System of Tunnel Ventilation based on stabilized power source

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Application publication date: 20151202