The content of the invention
A kind of the drawbacks of present invention is directed to prior art, there is provided power cable on-line monitoring system.
Power cable on-line monitoring system of the present invention, for being monitored to the running status of power cable, bagInclude power frequency method WeChat ID processing measuring unit group, pci data capture card array and monitoring and warning server；
Wherein, the power frequency method WeChat ID processing measuring unit group includes the work to match with power cable quantity to be measuredFrequency method WeChat ID handles measuring unit, electricity of each power frequency method WeChat ID processing measuring unit to the power cable corresponding to itGas performance parameter is acquired；
The electric property ginseng of each power frequency method WeChat ID processing measuring unit collection of pci data capture card array receivedNumber, and each classical insulation collected is sent to the monitoring and warning server；
Classical insulation of the monitoring and warning server according to corresponding to each power cable received and calculateThe electricity function index data of each power cable.
In power cable on-line monitoring system of the present invention, each power frequency method WeChat ID processing measuring unit and instituteState and carried out data transmission by CAN between pci data capture card array.
In power cable on-line monitoring system of the present invention, the monitoring and warning server includes data processing listMember, network communication unit and information output unit；
Wherein, the data processing unit is calculated each classical insulation and determines the electrical resistance of each power cableCan achievement data；
The network communication unit is used for the electrical resistance that each classical insulation and/or each power cable are sent to network-sideEnergy achievement data, and, automatic network end receives data message and simultaneously sent to data processing unit；
Described information output unit is used to externally export each classical insulation and/or the electric property of each power cable refers toMark data.
In power cable on-line monitoring system of the present invention, the classical insulation includes the insulation of power cableValue, and/or capacitance, and/or current in resistance property, and/or capacity current, and/or temperature information；
The electricity function index data are the insulating resistance value of power cable, and/or the trouble point information of power cable.
In power cable on-line monitoring system of the present invention, with i1Labeled as the electric current of power cable head end to be measuredValue, with i2Labeled as the current value of power cable tail end to be measured, and with i10Labeled as the current value i of power cable head end to be measured1Initial value, with i20Labeled as the current value i of power cable tail end to be measured2Initial value；
Then work as i1=i2When, the data processing unit judges that power cable insulation is good；
Work as i1=i2And i1＞ i10Or i1＞ i20, the data processing unit judgement power cable integrally makes moist or aging；
Work as i1≠i2, and i1、i2All increase compared with initial value, the data processing unit judges that local event occurs in power cableIt is bad to hinder insulating properties, electric branch, water tree, shelf depreciation, cable socket defective insulation or surface smut occurs；
Work as i1≠i2, and i1、i2All reduce compared with initial value, the data processing unit judges power cable insulation layer over the groundDefective insulation, there is multipoint earthing.
In power cable on-line monitoring system of the present invention, work as i1≠i2And i1、i2When all increasing compared with initial value, orPerson, work as i1≠i2And i1、i2When all reducing compared with initial value；
L is labeled as with head end distance of the trouble point apart from the power cable to be measured1, with trouble point apart from the electricity to be measuredThe tail end distance of power cable is labeled as l2；
Then i1/i2=l1/l2。
In power cable on-line monitoring system of the present invention, high precision electric current transducer is not used, and switchs to makeMeasuring unit is handled with power frequency method WeChat ID, greatly facilitates monitoring；It is meanwhile convenient using pci data capture card arrayIncreased according to the quantity of power cable to be measured and expanded, can save substantial amounts of system constructing fund, and can be withThe position of the convenient localization of faults, improve the combination property of on-line monitoring.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification textWord can be implemented according to this.
As shown in figure 1, power cable on-line monitoring system of the present invention, for entering to the running status of power cableRow monitoring, that is, it is used to determine insulating properties, failure situation and position of failure point of power cable etc..Therefore, this power cable existsLine monitoring system includes power frequency method WeChat ID processing measuring unit group, pci data capture card array and monitoring and warning server.
Wherein, the power frequency method WeChat ID processing measuring unit group includes the work to match with power cable quantity to be measuredFrequency method WeChat ID handles measuring unit, in the present embodiment, exemplified by monitoring cable 1, cable 2, cable 3, respectively in cable 1, electricityPower frequency method WeChat ID corresponding to being provided with cable 2, cable 3 handles measuring unit 11, power frequency method WeChat ID handles measuring unit 12,Measuring unit 13 is handled with power frequency method WeChat ID, is acquired with the classical insulation to each corresponding power cable.HereInsulation values, capacitance, current in resistance property, the capacitive that the classical insulation of described power cable may particularly include power cable are electricStream, temperature information etc., these parameters can handle measuring unit come real by the commercially available power frequency method WeChat ID with such functionIt is existing, also, above-mentioned each parameter both can be obtained individually, can also be combined acquisition.
The electric property ginseng of each power frequency method WeChat ID processing measuring unit collection of pci data capture card array receivedNumber, and each classical insulation collected is sent to the monitoring and warning server.The pci data capture card array isIt is adapted with the total amount of each power frequency method WeChat ID processing measuring unit, when the total amount of each power frequency method WeChat ID processing measuring unitDuring increase, it can be matched again by extending the pci data capture card array.Meanwhile in view of the advantage of CAN, will alsoData are carried out by CAN between each power frequency method WeChat ID processing measuring unit and the pci data capture card arrayTransmission.CAN should be the data transfer mode that long transmission distance, maintenance are simple, reliable so far, and haveHardware error correcting capability, it is not necessary to software carries out extra correction process, although than only optical fiber in transmission speed, forThe little occasion of this data volume of line monitoring system, undoubtedly most suitable scheme, so prioritizing selection CAN is total in the present embodimentLine transmits data.
Classical insulation of the monitoring and warning server according to corresponding to each power cable received and calculateThe electricity function index data of each power cable.Specifically, the monitoring and warning server includes data processing unit, networkCommunication unit and information output unit.Wherein, the data processing unit enters according to predetermined rule to each classical insulationRow calculates and determines the electricity function index data of each power cable, i.e. the insulating resistance value and/or power cable of power cableTrouble point information.The network communication unit is used to send each classical insulation and/or each power cable to network-sideElectricity function index data, and, automatic network end receives data message and sent to data processing unit.That is, the netNetwork communication unit can send the intermediate data monitored to network-side, and final monitoring result can also be sent to network-side；Meanwhile for the control centre in the network other end, it can be realized by the network communication unit and monitoring and warning is takenRemote access, remote analysis and remote upgrade of business device etc..Such as equipment manufacturer need carry out system upgrade when, without workPersonnel directly carry out upgrade service by internet, have the advantages of speed is fast, real-time to execute-in-place.It is in addition, describedNetwork communication unit can also send Monitoring Data the mobile terminal held to staff, so as to facilitate staff at any time withThe operation conditions of the grasp power cable on ground.
Described information output unit is then used for the electric property for externally exporting each classical insulation and/or each power cableAchievement data, the information output unit can be with LCDs or the touch-screen with interactive function is realized.When using touchDuring screen, also warning limit value can be set by automatic or manual mode, to adapt to the setting valve under various occasions.For example, work asThe insulaion resistance of certain cable declines but corresponding prompting can be sent when being not above predetermined boundary value to cause work peopleThe attention of member, and alarm can be sent when insulaion resistance value beyond the mark, to notify staff to make corresponding processing.Meanwhile also it can provide foundation by touch screen query historical data for the setting valve setting of each power cable.
Power frequency method is that the dielectric loss value of cable, Ran Houji are calculated by the relation of measuring system voltage and leakage currentThe parameters such as resistive component, capacitive component, harmonic component are calculated, finally give the insulating resistance value of cable, this method is to mining electricityThe damp degree of cable is particularly sensitive, therefore is the first choice in each cable test.Compared with other test philosophies, using power frequencyThe cable fault monitoring system of method measuring principle can sensitive reflection cable make moist situation, therefore be especially suitable for this environment of mine and dislikeBad occasion.
In the present invention, judge for the insulating properties of power cable and the judgement of the particular location of trouble point can be as followsCarry out, i.e., with i1Labeled as the current value of power cable head end to be measured, with i2Labeled as the current value of power cable tail end to be measured,And with i10Labeled as the current value i of power cable head end to be measured1Initial value, with i20Labeled as the electricity of power cable tail end to be measuredFlow valuve i2Initial value.
Then work as i1=i2When, the data processing unit judges that power cable insulation is good；
Work as i1=i2And i1＞ i10Or i1＞ i20, the data processing unit judgement power cable integrally makes moist or aging；
Work as i1≠i2, and i1、i2All increase compared with initial value, the data processing unit judges that local event occurs in power cableIt is bad to hinder insulating properties, electric branch, water tree, shelf depreciation, cable socket defective insulation or surface smut occurs；
Work as i1≠i2, and i1、i2All reduce compared with initial value, the data processing unit judges power cable insulation layer over the groundDefective insulation, there is multipoint earthing.
Further, i is worked as1≠i2And i1、i2When all increasing compared with initial value, or, work as i1≠i2And i1、i2It is all more initialWhen value reduces；L is labeled as with head end distance of the trouble point apart from the power cable to be measured1, with trouble point apart from described to be measuredThe tail end distance of power cable is labeled as l2；
Then i1/i2=l1/l2。
Power cable on-line monitoring system of the present invention not only can be to the exhausted of cable it can be seen from analysis more thanEdge performance makes qualitative judgement, can also further determine that the position of trouble point.
In power cable on-line monitoring system of the present invention, high precision electric current transducer is not used, and switchs to makeMeasuring unit is handled with power frequency method WeChat ID, greatly facilitates monitoring；It is meanwhile convenient using pci data capture card arrayIncreased according to the quantity of power cable to be measured and expanded, can save substantial amounts of system constructing fund, and can be withThe position of the convenient localization of faults, improve the combination property of on-line monitoring.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listedWith it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the artOther modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, it is of the invention and unlimitedIn specific details and shown here as the legend with description.