CN103645420A - Power cable online monitoring system - Google Patents
Power cable online monitoring system Download PDFInfo
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- CN103645420A CN103645420A CN201310661971.6A CN201310661971A CN103645420A CN 103645420 A CN103645420 A CN 103645420A CN 201310661971 A CN201310661971 A CN 201310661971A CN 103645420 A CN103645420 A CN 103645420A
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Abstract
The invention discloses a power cable online monitoring system. The system comprises a PCI data collection card array, a monitoring early warning server and a micro signal processing measurement unit. The micro signal processing measurement unit is connected with the PCI data collection card array through a CAN bus mode. The PCI data collection card array is connected with the monitoring early warning server. A control method comprises the following steps that a, by using a power frequency method, the micro signal processing measurement unit calculates parameters of an insulation value of a cable, a capacitance, a resistive current, a capacitive current, a temperature and the like; parameter data is transmitted to the monitoring early warning server through the CAN bus; b, the monitoring early warning server analyzes the data, determines an insulation condition of the cable and judges a fault point. By using the system of the invention, an operation state of the cable can be monitored in real time; according to the design of the PCI data collection card array, when many cables are needed to be monitored, a purpose can be achieved through directly expanding PCI data collection cards; through analyzing the detected data, a fault generation place is determined.
Description
Technical field
The present invention relates to a kind of power cable on-line monitoring system.
Background technology
The on-line monitoring technique of electrical equipment is in the development that had obtained advancing by leaps and bounds in the last few years, the aspects such as especially microsignal collection, operational reliability are all improved significantly, on-line monitoring (status monitoring) can be realized monitoring in real time to each electrical equipment, Measurement and analysis by each electric parameters before each electrical equipment malfunction realizes equipment and optionally overhauls, Socie-economic loss is down to minimum, capacitive apparatus on-line monitoring is as the part in on-line monitoring system, more and more receive people's concern, especially the on-line measurement of capacitive apparatus medium loss.
Power cable insulation monitoring method mainly contains DC component method, shelf depreciation method, low frequency method of superposition and power frequency method etc. at present, and wherein power frequency method is a kind of relatively practical method in these methods.In the past when using power frequency method to measure capacitive apparatus, all by voltage, electric current are carried out to phase measurement, when the drawback of this method is the harmonic component containing in electrical network to a certain degree, its measuring error can sharply increase, owing to must depend on high precision low current sensor guarantee measuring accuracy in measuring capacitive apparatus process, this makes troubles to surveying work undoubtedly, loses due value even completely.
Summary of the invention
The present invention proposes a kind of power cable on-line monitoring system, adopt independent measurement unit centralization to realize the management to each Monitoring Data, leakage current, running current, insulating resistance value, temperature, humidity etc. all belong to independently measured node, each node has the attribute of self, as location information, historical data, out-of-limit value etc., by CAN bus, the data of monitoring are sent to monitoring and warning server early warning analysis, the operation conditions of Real-Time Monitoring cable.
Technical scheme of the present invention is achieved in that
A kind of power cable on-line monitoring system, comprise pci data capture card array, monitoring and warning server, micro-signal processing measuring unit, described micro-signal is processed measuring unit and is connected pci data capture card array by CAN bus mode, described pci data capture card array connects monitoring and warning server, and its control method comprises:
The parameters such as a, the insulation values that adopts power frequency method micro-signal to process measuring unit to calculate cable, electric capacity, current in resistance property, capacity current, temperature, are sent to monitoring and warning server by supplemental characteristic by CAN bus;
B, monitoring and warning server are analyzed data, the insulativity situation of judgement cable, and trouble spot is judged.
The described monitoring and warning server data that contrast receives according to predetermined value scope, exceeding this predetermined value scope is trigger alarm system.
Described monitoring and warning server connection server terminal and expansion.
The insulation values of described cable, electric capacity, current in resistance property, capacity current adopt the method for dielectric loss value tg δ to record.
In step b, the decision method of trouble spot is met:
1. i
1=i
2, cable insulation is good, wherein i
1, i
2be respectively the current value that cable under test is located from beginning to end;
2. i
1=i
2> i
10or i
20, illustrate that whole cable is made moist or aging, wherein i
10, i
20for i
1, i
2initial value;
3. i
1≠ i
2, but both increase, illustrate that cable occurs that local fault insulativity is bad, occurs electric branch, water tree, shelf depreciation, cable socket defective insulation or surperficial dirt, i
1, i
2the amplitude increasing depends on the distance of trouble spot, and has relation: i
1/ i
2=l
1/ l
2, l wherein
1, l
2the distance of locating from beginning to end for cable under test;
4. i
1≠ i
2, but both reduce, illustrate that cable insulation insulation against ground is bad, as occur multipoint earthing situation, and it is also relevant in fault distance to reduce amplitude, and also have relation: i
1/ i
2=l
1/ l
2.
The beneficial effect that the present invention produces is: the operation conditions that the present invention can Real-Time Monitoring cable, and the design that pci data gathers array need to increase when more cables are monitored, do not need to spend again a large amount of funds to set up unnecessary Warning Service device, directly expansion pci data capture card can achieve the goal, server software only need to expand respective cable monitoring project and can put into operation fast, can also judge by analyzing data measured the scene of fault.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the present invention detects framework schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
With reference to Fig. 1, a kind of power cable on-line monitoring system, comprise pci data capture card array 1, monitoring and warning server 2, micro-signal processing measuring unit 4, described micro-signal is processed measuring unit 4 and is connected pci data capture card array 1 by CAN bus mode, described pci data capture card array 1 connects monitoring and warning server 2, described monitoring and warning server 2 connection server terminals and expansion 4, its control method comprises:
The parameters such as a, the insulation values that adopts power frequency method micro-signal to process measuring unit to calculate cable, electric capacity, current in resistance property, capacity current, temperature, are sent to monitoring and warning server by supplemental characteristic by CAN bus;
B, monitoring and warning server are analyzed data, the insulativity situation of judgement cable, and trouble spot is judged.
Power frequency method is by the relation of measuring system voltage and leakage current, to calculate the dielectric loss value of cable, then calculate the parameters such as resistive component, capacitive component, harmonic component, finally obtain the insulating resistance value of cable, the method is particularly responsive to the degree of making moist of mine cable, therefore be the first-selection in each cable test, most of measuring method of ZXJY insulated on-line monitoring system is also used widely based on the method just.CAN bus should be so far long transmission distance, safeguard simple, reliable data transfer mode, and there is hardware error correcting capability, do not need software to carry out extra correction process, although compare only optical fiber in transmission speed, but for the little occasion of this data volume of on-line monitoring system, be undoubtedly most suitable scheme, so preferentially select CAN bus transfer data.
Optical fiber of the present invention and CAN bus schemes almost do not have the restriction of node, almost can unrestrictedly increase the data in different monitorings place by expansion pci data capture card array.And by the combination of pci data capture card array and central early warning system master system, monitoring and warning server connection server terminal and expansion, can realize the functions such as remote access, remote analysis and remote upgrade of whole monitoring system, such as manufacturer can be when the system upgrade, without staff, arrive execute-in-place, directly by internet, carry out upgrade service, there is fast, the real-time feature of speed.The on-line monitoring of cable system that refers to system remote online upgrading and internet Real-Time Monitoring realizes remote inquiry, monitoring measurement data under the prerequisite of connecting Internet, the upgrading of whole monitoring system to execute-in-place, directly realizes upgrading by internet without manufacturer.Can also Monitoring Data be sent to staff's mobile phone terminal by GPRS server, grasp the operation conditions of cable system whenever and wherever possible.
Compare with other test philosophies, adopt the feature of the cable fault monitoring system maximum of power frequency method measuring principle to be: the situation of can sensitive reflection cable making moist, DC-method, office put the additive methods such as method and be not suitable for the severe occasion of this environment of mine.In fact the insulation degree that judges cable can not only be leaned on a certain test data, and need comprehensive various data to judge cable insulation, because cause a lot of because have of cable insulation decline, as humidified insulation, multipoint earthing, excess Temperature etc., below elaborate the basis for estimation of various monitoring projects to insulation fault.
Insulation resistance (or humidified insulation degree): insulation resistance adopts the method for dielectric loss value tg δ to measure, can test out the insulation values, electric capacity, current in resistance property, capacity current of cable etc. simultaneously.The size of tg δ value directly reflects cable the whole series degree of making moist, highly sensitive, to measuring equipment, requires also very high.The normal cable tg δ that insulate is very little, generally below 0.1%, when surpassing 1.2%, cable tg δ value represents that insulation declines serious, when being down to 2%, probably there will be poly-liter of cable temperature even to cause cable direct short-circuit, now need interruption maintenance, can warning be set by adjusting the out-of-limit value of tg δ, the method belongs to quantitative judgement.
Leakage current instantaneous value: the instantaneous value of measuring at a high speed leakage current is very effective to the judgement of cable internal discharge, and be mainly to gather at cable splice place, from joint, affected by capacity effect away from more larger, also need if desired comprehensively to judge cable running status according to the ratio of leakage current and running current, belong to quantitative judgement.
Temperature monitoring: cable insulation will inevitably cause the rising of cable temperature while declining, can judge the insulation degree of this cable splice according to the numerical value of the variation range of temperature and running current, number qualitatively judges.
Trouble spot judging principle: be single-point grounding mostly for its method of operation of 6kV cable, minority is multipoint earthing, is the dielectric level that single-point grounding or multipoint earthing all need to monitor according to ground current, leakage current each section of cable.
The decision method of trouble spot is met:
1. i
1=i
2, cable insulation is good, wherein i
1, i
2be respectively the current value that cable under test is located from beginning to end;
2. i
1=i
2> i
10or i
20, illustrate that whole cable is made moist or aging, wherein i
10, i
20for i
1, i
2initial value;
3. i
1≠ i
2, but both increase, illustrate that cable occurs that local fault insulativity is bad, occurs electric branch, water tree, shelf depreciation, cable socket defective insulation or surperficial dirt, i
1, i
2the amplitude increasing depends on the distance of trouble spot, and has relation: i
1/ i
2=l
1/ l
2, l wherein
1, l
2the distance of locating from beginning to end for cable under test;
4. i
1≠ i
2, but both reduce, illustrate that cable insulation insulation against ground is bad, as occur multipoint earthing situation, and it is also relevant in fault distance to reduce amplitude, and also have relation: i
1/ i
2=l
1/ l
2.
Inferior method realizes on the Precision Theory of trouble spot judging can reach very high precision, considers other factors, substantially can reach: cable length * (1%～10%).
Monitoring and warning server is the core of whole system, except being responsible for the functions such as data processing, data transmission, systems connection, also be responsible for showing and processing test result, at crucial moment, pass through warning system or gprs system to staff's feed back on-site situation.
Monitoring and warning server display section is shown each wireline test data by giant-screen LCD industry LCDs and touchpad technology, wherein each insulating resistance value can define by automatic or manual mode warning limit value, to be applicable to the setting valve under various occasions, when occurring that insulation declines but there is no value beyond the mark, certain cable sends corresponding prompting to cause staff's attention, when insulating resistance value value beyond the mark, system is sent warning, notifies staff to make corresponding processing.Meanwhile, system provides database management function easily, and the analysis by historical data provides strong foundation for each monitoring cable setting valve.
Closely-related with monitoring and warning server is that pci data gathers array, monitoring and warning server connection server terminal and expansion, server terminal and expansion can connect display device, internet watch-dog, GPRS source of early warning, online upgrading program etc., the benefit of design is to need to increase when more cables are monitored like this, do not need to spend again a large amount of funds to set up unnecessary Warning Service device, directly expansion pci data capture card can achieve the goal, and server software only need to expand respective cable monitoring project and can put into operation fast.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a power cable on-line monitoring system, it is characterized in that, comprise pci data capture card array, monitoring and warning server, micro-signal processing measuring unit, described micro-signal is processed measuring unit and is connected pci data capture card array by CAN bus mode, described pci data capture card array connects monitoring and warning server, and its control method comprises:
The parameters such as a, the insulation values that adopts power frequency method micro-signal to process measuring unit to calculate cable, electric capacity, current in resistance property, capacity current, temperature, are sent to monitoring and warning server by supplemental characteristic by CAN bus;
B, monitoring and warning server are analyzed data, the insulativity situation of judgement cable, and trouble spot is judged.
2. a kind of power cable on-line monitoring system as claimed in claim 1, is characterized in that, the described monitoring and warning server data that contrast receives according to default value scope, and exceeding this default value scope is trigger alarm system.
3. a kind of power cable on-line monitoring system as claimed in claim 1, is characterized in that, the insulation values of described cable, electric capacity, current in resistance property, capacity current adopt the method for dielectric loss value tg δ to record.
4. a kind of power cable on-line monitoring system as claimed in claim 1, is characterized in that, described monitoring and warning server connection server terminal and expansion.
5. a kind of power cable on-line monitoring system as claimed in claim 1, is characterized in that, in step b, the decision method of trouble spot is met:
1. i
1=i
2, illustrate that cable insulation is good, wherein i
1, i
2be respectively the current value that cable under test is located from beginning to end;
2. i
1=i
2> i
10or i
20, illustrate that whole cable is made moist or aging, wherein i
10, i
20for i
1, i
2initial value;
3. i
1≠ i
2, but both increase, illustrate that cable occurs that local fault insulativity is bad, occurs electric branch, water tree, shelf depreciation, cable socket defective insulation or surperficial dirt, i
1, i
2the amplitude increasing depends on the distance of trouble spot, and has relation: i
1/ i
2=l
1/ l
2, l wherein
1, l
2the distance of locating from beginning to end for cable under test;
4. i
1≠ i
2, but both reduce, illustrate that cable insulation insulation against ground is bad, as occur multipoint earthing situation, and it is also relevant in fault distance to reduce amplitude, and also have relation: i
1/ i
2=l
1/ l
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310661971.6A CN103645420A (en) | 2013-12-09 | 2013-12-09 | Power cable online monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310661971.6A CN103645420A (en) | 2013-12-09 | 2013-12-09 | Power cable online monitoring system |
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| CN103645420A true CN103645420A (en) | 2014-03-19 |
Family
ID=50250670
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| CN201310661971.6A Pending CN103645420A (en) | 2013-12-09 | 2013-12-09 | Power cable online monitoring system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093679A (en) * | 2016-06-23 | 2016-11-09 | 顾鸿鸣 | A kind of cable on-line checking and fault diagnosis system |
| CN106546877A (en) * | 2016-11-08 | 2017-03-29 | 国网上海市电力公司 | A kind of Method of Cable Trouble Point accurate positioning method based on curve matching |
| CN107861025A (en) * | 2017-10-31 | 2018-03-30 | 武汉泽旭科技有限公司 | A kind of power cable on-line monitoring system |
| CN110045238A (en) * | 2019-04-09 | 2019-07-23 | 山东鲁源电气股份有限公司 | Cable shield fault determination method, device, equipment and storage medium |
| CN110225107A (en) * | 2019-06-04 | 2019-09-10 | 上海锐测电子科技有限公司 | Cable comprehensive detection system |
| CN110595532A (en) * | 2019-08-02 | 2019-12-20 | 北京三清互联科技有限公司 | System and method for collecting and monitoring wave recording data of power transmission line |
| CN110907780A (en) * | 2019-12-30 | 2020-03-24 | 深圳供电局有限公司 | Method and device for on-line detection of partial discharge in terminal |
| CN112858853A (en) * | 2021-01-27 | 2021-05-28 | 广东工业大学 | Method for testing and detecting moisture degree of vehicle-mounted EPR cable in acidic environment |
| CN113970687A (en) * | 2021-10-28 | 2022-01-25 | 中铁第四勘察设计院集团有限公司 | Cable test method for normally-conducting high-speed magnetic suspension long stator ground coil |
| CN114295943A (en) * | 2021-12-23 | 2022-04-08 | 上海大学无锡产业研究院 | Cable insulation state online monitoring communication method and system for spraying equipment |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093679A (en) * | 2016-06-23 | 2016-11-09 | 顾鸿鸣 | A kind of cable on-line checking and fault diagnosis system |
| CN106546877A (en) * | 2016-11-08 | 2017-03-29 | 国网上海市电力公司 | A kind of Method of Cable Trouble Point accurate positioning method based on curve matching |
| CN106546877B (en) * | 2016-11-08 | 2019-01-25 | 国网上海市电力公司 | A kind of Method of Cable Trouble Point accurate positioning method based on curve matching |
| CN107861025A (en) * | 2017-10-31 | 2018-03-30 | 武汉泽旭科技有限公司 | A kind of power cable on-line monitoring system |
| CN110045238A (en) * | 2019-04-09 | 2019-07-23 | 山东鲁源电气股份有限公司 | Cable shield fault determination method, device, equipment and storage medium |
| CN110225107A (en) * | 2019-06-04 | 2019-09-10 | 上海锐测电子科技有限公司 | Cable comprehensive detection system |
| CN110595532A (en) * | 2019-08-02 | 2019-12-20 | 北京三清互联科技有限公司 | System and method for collecting and monitoring wave recording data of power transmission line |
| CN110595532B (en) * | 2019-08-02 | 2021-11-26 | 北京三清互联科技有限公司 | System and method for collecting and monitoring wave recording data of power transmission line |
| CN110907780A (en) * | 2019-12-30 | 2020-03-24 | 深圳供电局有限公司 | Method and device for on-line detection of partial discharge in terminal |
| CN112858853A (en) * | 2021-01-27 | 2021-05-28 | 广东工业大学 | Method for testing and detecting moisture degree of vehicle-mounted EPR cable in acidic environment |
| CN113970687A (en) * | 2021-10-28 | 2022-01-25 | 中铁第四勘察设计院集团有限公司 | Cable test method for normally-conducting high-speed magnetic suspension long stator ground coil |
| CN113970687B (en) * | 2021-10-28 | 2023-10-27 | 中铁第四勘察设计院集团有限公司 | Cable test method for normally-conductive high-speed magnetic suspension long stator ground coil |
| CN114295943A (en) * | 2021-12-23 | 2022-04-08 | 上海大学无锡产业研究院 | Cable insulation state online monitoring communication method and system for spraying equipment |
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Inventor after: Song Shu Inventor after: Zuo Lin Inventor after: Zhao Haiyun Inventor after: Sheng Gang Inventor before: Song Shu Inventor before: Zhang Hui Inventor before: Zuo Lin Inventor before: Sheng Gang |
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