CN105116283A - Downhole power cable insulation monitoring device - Google Patents

Downhole power cable insulation monitoring device Download PDF

Info

Publication number
CN105116283A
CN105116283A CN201510507644.4A CN201510507644A CN105116283A CN 105116283 A CN105116283 A CN 105116283A CN 201510507644 A CN201510507644 A CN 201510507644A CN 105116283 A CN105116283 A CN 105116283A
Authority
CN
China
Prior art keywords
circuit
resistance
power cable
operational amplifier
insulation monitoring
Prior art date
Application number
CN201510507644.4A
Other languages
Chinese (zh)
Inventor
宋剑
Original Assignee
苏州市新瑞奇节电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 苏州市新瑞奇节电科技有限公司 filed Critical 苏州市新瑞奇节电科技有限公司
Priority to CN201510507644.4A priority Critical patent/CN105116283A/en
Publication of CN105116283A publication Critical patent/CN105116283A/en

Links

Abstract

The invention discloses a downhole power cable insulation monitoring device 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 signal conditioning circuit comprises a wave trap circuit, a filtering circuit, an amplification circuit, and a rectification circuit. The wave trap circuit comprises first to fourth resistors, a first capacitor, a second capacitor, and an operational amplifier. The downhole power cable insulation monitoring device may online monitor the insulation state of a cable in real time, improves coal mine power supply continuity, reliability and security, achieves high sensitivity and low errors, and timely notifies downhole and ground workers for carrying out handling so as to guarantee operation safety and prevent economic losses.

Description

A kind of down-hole power cable insulation monitoring device
Technical field
The present invention relates to Electric Power Equipment Insulation monitoring technical field, particularly a kind of down-hole power cable insulation monitoring device.
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, 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 overcomes the deficiencies in the prior art and provides a kind of down-hole power cable insulation monitoring device, and this device 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 down-hole power cable insulation monitoring device 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 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 with the three-phase wire in cable respectively, Hall current sensor is enclosed within cable, Hall current sensor is connected successively with trap circuit, filtering circuit, amplifying circuit, rectification 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;
Described signal conditioning circuit comprises the trap circuit, filtering circuit, amplifying circuit and the rectification circuit that connect successively; Described trap circuit comprises first to fourth resistance, the first electric capacity, the second electric capacity and operational amplifier, one end of first resistance is connected respectively with one end of one end of the first electric capacity, the second electric capacity, one end of second resistance is connected respectively with one end of the 4th resistance, the positive pole of operational amplifier, the other end ground connection of the 4th resistance, the other end of the second electric capacity is connected respectively with one end of the 3rd resistance, the negative pole of operational amplifier, and the other end of the 3rd resistance is connected respectively with the other end of the first electric capacity, the output terminal of operational amplifier.
As the further prioritization scheme of a kind of down-hole power cable insulation monitoring device of the present invention, described operational amplifier is LM741 operational amplifier.
As the further prioritization scheme of a kind of down-hole power cable insulation monitoring device of the present invention, described central processing unit is FPGA.
As the further prioritization scheme of a kind of down-hole power cable insulation monitoring device of the present invention, described Hall current sensor is CE-IJ03-52BS2 Hall current sensor.
As the further prioritization scheme of a kind of down-hole power cable insulation monitoring device 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) this device 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) this device sensitivity is high and error is little.
Accompanying drawing explanation
Fig. 1 is the structural representation of this device.
Fig. 2 is trap circuit figure.
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:
As shown in Figure 1, a kind of down-hole power cable insulation monitoring device, 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; Described signal conditioning circuit comprises the trap circuit, filtering circuit, amplifying circuit and the rectification circuit that connect successively; 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 with the three-phase wire in cable 3 respectively, Hall current sensor is enclosed within cable, Hall current sensor is connected successively with trap circuit, filtering circuit, amplifying circuit, rectification 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;
Trap circuit, filtering circuit, amplifying circuit and rectification circuit, for by output low frequency current signal after current signal respectively 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 shown in Figure 2, described trap circuit comprises first to fourth resistance R1-R4, the first electric capacity C1, the second electric capacity C2 and operational amplifier, one end of first resistance is connected respectively with one end of one end of the first electric capacity, the second electric capacity, one end of second resistance is connected respectively with one end of the 4th resistance, the positive pole of operational amplifier, the other end ground connection of the 4th resistance, the other end of the second electric capacity is connected respectively with one end of the 3rd resistance, the negative pole of operational amplifier, and the other end of the 3rd resistance is connected respectively with the other end of the first electric capacity, the output terminal of operational amplifier.
Described operational amplifier is LM741 operational amplifier.
Described central processing unit is FPGA.
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 down-hole power cable insulation monitoring device, 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 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 with the three-phase wire in cable respectively, Hall current sensor is enclosed within cable, Hall current sensor is connected successively with trap circuit, filtering circuit, amplifying circuit, rectification 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;
Described signal conditioning circuit comprises the trap circuit, filtering circuit, amplifying circuit and the rectification circuit that connect successively; Described trap circuit comprises first to fourth resistance, the first electric capacity, the second electric capacity and operational amplifier, one end of first resistance is connected respectively with one end of one end of the first electric capacity, the second electric capacity, one end of second resistance is connected respectively with one end of the 4th resistance, the positive pole of operational amplifier, the other end ground connection of the 4th resistance, the other end of the second electric capacity is connected respectively with one end of the 3rd resistance, the negative pole of operational amplifier, and the other end of the 3rd resistance is connected respectively with the other end of the first electric capacity, the output terminal of operational amplifier.
2. a kind of down-hole power cable insulation monitoring device according to claim 1, it is characterized in that, described operational amplifier is LM741 operational amplifier.
3. a kind of down-hole power cable insulation monitoring device according to claim 1, it is characterized in that, described central processing unit is FPGA.
4. a kind of down-hole power cable insulation monitoring device according to claim 1, it is characterized in that, described Hall current sensor is CE-IJ03-52BS2 Hall current sensor.
5. a kind of down-hole power cable insulation monitoring device according to claim 1, is characterized in that, the frequency of described low-frequency ac voltage signal is 10Hz.
CN201510507644.4A 2015-08-19 2015-08-19 Downhole power cable insulation monitoring device CN105116283A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510507644.4A CN105116283A (en) 2015-08-19 2015-08-19 Downhole power cable insulation monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510507644.4A CN105116283A (en) 2015-08-19 2015-08-19 Downhole power cable insulation monitoring device

Publications (1)

Publication Number Publication Date
CN105116283A true CN105116283A (en) 2015-12-02

Family

ID=54664318

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510507644.4A CN105116283A (en) 2015-08-19 2015-08-19 Downhole power cable insulation monitoring device

Country Status (1)

Country Link
CN (1) CN105116283A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106297166A (en) * 2016-08-24 2017-01-04 无锡卓信信息科技股份有限公司 A kind of liquid hazardous materials transportation vehicle monitor system
CN106395517A (en) * 2016-10-28 2017-02-15 江苏金米智能科技有限责任公司 Elevator strop control device based on signal conditioning circuit
CN106429665A (en) * 2016-10-28 2017-02-22 江苏金米智能科技有限责任公司 Stabilized power supply-based elevator stopping control device
CN106442270A (en) * 2016-11-15 2017-02-22 江苏智石科技有限公司 Signal processing circuit based automatic monitor for dust on filter screen of air purifier
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
CN106597919A (en) * 2016-11-15 2017-04-26 江苏智石科技有限公司 Signal conditioning circuit-based automatic cleaning system of air purifier
CN106647451A (en) * 2016-11-15 2017-05-10 江苏智石科技有限公司 Automatic cleaning system for air cleaner
CN106627626A (en) * 2016-10-28 2017-05-10 江苏金米智能科技有限责任公司 Intelligent and telescopic metro seat based on signal conditioning
CN106908689A (en) * 2017-01-11 2017-06-30 中国船舶工业系统工程研究院 A kind of marine geophysical prospecting towing cable based on FGPA is powered monitor equipment in real time
CN109631986A (en) * 2018-12-03 2019-04-16 国网浙江省电力有限公司电力科学研究院 A kind of cable and its monitoring of working condition early warning system

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
CN104133114A (en) * 2014-07-29 2014-11-05 李磊 Insulation parameter detecting method for mine low-voltage cable
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

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 (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106297166A (en) * 2016-08-24 2017-01-04 无锡卓信信息科技股份有限公司 A kind of liquid hazardous materials transportation vehicle monitor system
CN106395517A (en) * 2016-10-28 2017-02-15 江苏金米智能科技有限责任公司 Elevator strop control device based on signal conditioning circuit
CN106429665A (en) * 2016-10-28 2017-02-22 江苏金米智能科技有限责任公司 Stabilized power supply-based elevator stopping control device
CN106627626A (en) * 2016-10-28 2017-05-10 江苏金米智能科技有限责任公司 Intelligent and telescopic metro seat based on signal conditioning
CN106442270A (en) * 2016-11-15 2017-02-22 江苏智石科技有限公司 Signal processing circuit based automatic monitor for dust on filter screen of air purifier
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
CN106597919A (en) * 2016-11-15 2017-04-26 江苏智石科技有限公司 Signal conditioning circuit-based automatic cleaning system of air purifier
CN106647451A (en) * 2016-11-15 2017-05-10 江苏智石科技有限公司 Automatic cleaning system for air cleaner
CN106908689A (en) * 2017-01-11 2017-06-30 中国船舶工业系统工程研究院 A kind of marine geophysical prospecting towing cable based on FGPA is powered monitor equipment in real time
CN106908689B (en) * 2017-01-11 2019-05-24 中国船舶工业系统工程研究院 A kind of marine geophysical prospecting towing cable based on FGPA is equipped for pyroelectric monitor in real time
CN109631986A (en) * 2018-12-03 2019-04-16 国网浙江省电力有限公司电力科学研究院 A kind of cable and its monitoring of working condition early warning system

Similar Documents

Publication Publication Date Title
CN104407286B (en) A kind of high voltage isolator machine performance monitoring and method for early warning
CN105988063B (en) A kind of comprehensive on-line monitoring method of transmission line malfunction hidden danger and device
CN207528861U (en) A kind of status early warning device suitable for the detection of high-tension switch cabinet internal gas
CN103675623B (en) GIS partial discharge detection method and system under a kind of surge voltage
CN203941220U (en) A kind of underground high voltage cable comprehensive monitor system
CN201965191U (en) Capacitor intelligentizing device
CN103116107A (en) High voltage direct current power source insulation monitoring device
CN205665347U (en) 10kV distribution lines broken string fault detection and positioning system based on three phase voltage electric current
CN102735968A (en) GIS (Geographic Information System) fault diagnosis system and method based on vibration signal spectrum analysis
CN104677417B (en) A kind of fault detection system and its detection method for transmission line of electricity
CN101261301A (en) Locomotive control loop grounding detection circuit and grounding detection method and wire break detection method
CN103376387A (en) Transmission grid fault detection system and method based on internet of thing technology
CN103454517B (en) Capacitance type potential transformer on-line monitoring method
US20160187406A1 (en) Method and system for identifying lightning fault and the type thereof in the overhead transmission line
CN204330025U (en) Overground cable security of operation online monitoring system
CN106463944A (en) Method for detecting an open-phase condition of a transformer
CN103344884B (en) Power overhead network fault two-frequency signal detection and location method and special orientator thereof
CN102590676B (en) Device and method for detecting fault of direct current looped network of direct current power supply system
CN202217029U (en) Novel partial discharge comprehensive monitoring and analyzing system
CN204347118U (en) Electrification in high voltage numerical monitor and blocking device
CN105067962A (en) Low-current grounding line selection device
CN102565588A (en) On-line monitoring method used for high-voltage XLPE (Cross Linked Polyethylene) cable
CN106093720B (en) High-voltage cable state monitoring system and its implementation based on protective grounding case
CN204882720U (en) Intelligent computer direct current system monitoring facilities
CN206301449U (en) Intelligent power safe early warning watch-dog

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20151202