CN105785246B - Live detection and on-Line Monitor Device for EHV XLPE power cable insulation diagnosis - Google Patents
Live detection and on-Line Monitor Device for EHV XLPE power cable insulation diagnosis Download PDFInfo
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- CN105785246B CN105785246B CN201610261906.8A CN201610261906A CN105785246B CN 105785246 B CN105785246 B CN 105785246B CN 201610261906 A CN201610261906 A CN 201610261906A CN 105785246 B CN105785246 B CN 105785246B
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000009413 insulation Methods 0.000 title claims abstract description 28
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 27
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 27
- 238000003745 diagnosis Methods 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 17
- 239000011162 core material Substances 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 229910000889 permalloy Inorganic materials 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 240000005572 Syzygium cordatum Species 0.000 description 7
- 235000006650 Syzygium cordatum Nutrition 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
- 238000012631 diagnostic technique Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
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- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Abstract
The invention discloses a kind of live detections and on-Line Monitor Device for EHV XLPE power cable insulation diagnosis, A end systems and B end systems including being separately positioned on tested cable head and end, inside A end systems and B end systems, current comparator is set on cable under test ontology, the output end of the input terminal connection current comparator of center control subsystem, another input terminal connects voltage to be measured by standard capacitor, and the output end of center control subsystem is connected by voltage-controlled current source with the input terminal of current comparator；The center control subsystem of A end systems is also connect with data processing terminal, and the center control subsystem of A, B end system is connected and is communicated by GPRS wireless networks.Reasonable design of the present invention, it is simple in structure, it can realize in fortune extra-high-tension cable insulation live detection and on-line monitoring, so that the overall utilization rate of equipment is effectively improved, while improving production efficiency, reduce production cost.
Description
Technical field
The present invention relates to a kind of live detections and on-Line Monitor Device for EHV XLPE power cable insulation diagnosis, belong to
High pressure interior insulation technical field.
Background technology
With the continuous quickening of urbanization process and being continuously increased for Analyzing Total Electricity Consumption, 220kV and the above ultrahigh-voltage XLPE
Cable due to good process structure, excellent electric property and safe and reliable operation characteristic, almost comprehensively instead of
The power cable of traditional form, thus become the important ring for ensureing power transmission network reliability service to the Accurate Diagnosis of its operating status
Section.
It is generally believed that shelf depreciation, electric branch, water tree are to cause XLPE cable and its attachment aging, insulation
The reason of performance declines.Extra-high-tension cable and attachment are often because there is immersion operation phenomenon in the influence of level of ground water, even if increasing
The safeguard procedures such as protective metal shell and oversheath, the risk that cable still has watered and wetting and water tree generates, seriously affect superelevation
The safe and stable operation of piezoelectric forces cable power transmission network.Therefore, to the Site Detection of ultrahigh-voltage XLPE cable water tree degree of aging
The application study of method just seems particularly urgent, in time, accurately controls in fortune extra-high-tension cable insulation status, takes necessary
Counter-measure reduces sudden power outage and is of great practical significance.
XLPE cable water-treeing Testing Technology Study is more early, primarily directed to the research theory of test method, including：It is resistance to
Experiment, partial discharge test etc. are pressed, in view of practical problem complexity, widely accepted achievement in research is seldom at present.In recent years,
Domestic and international expert carries out for characteristics such as the rectifying effect of the XLPE cable containing water tree, polar effect, harmonic effect, ultralow frequency responses
Research, has pushed the further development of XLPE cable water tree diagnostic techniques theory, including：DC component method, loss factor method, damage
Power consumption stream harmonic component method, ultralow frequency response method etc..Wherein, loss factor method and loss current harmonic component method have been supplied in electricity
Power cable power failure detection field, but not yet realize the application in fortune cable status evaluation areas.
Invention content
It is a primary object of the present invention to overcome the deficiencies of existing technologies, provide a kind of exhausted for EHV XLPE power cable
The live detection and on-Line Monitor Device of edge diagnosis can realize that the test of loss current harmonic component and loss factor measure, real
The on-line checking of fortune EHV XLPE power cable state of insulation now, the transmission reliability of elevating ultrahigh piezoelectric forces cable.
In order to achieve the above object, the technical solution adopted in the present invention is：
Live detection and on-line monitoring system for EHV XLPE power cable insulation diagnosis, which is characterized in that including dividing
A end systems and B end systems in tested cable head and end is not set, and the A end systems and B end systems are wireless by GPRS
Network connection, the A end systems include current comparator, voltage-controlled current source, standard capacitor, center control with B end systems
Subsystem, the A end systems further include data processing terminal；
Inside A end systems and B end systems, the current comparator is set on cable under test ontology, the center control
The output end of the input terminal connection current comparator of subsystem, another input terminal is connected to be measured by standard capacitor
The output end of voltage, the center control subsystem is connected by voltage-controlled current source with the input terminal of current comparator；A end systems
In center control subsystem also connect with data processing terminal, the center of the center control subsystem and B end systems of A end systems
Control subsystem is connected and is communicated by GPRS wireless networks；
The current comparator includes the magnetic screen fitted closely successively, alihnment coil, coarse adjustment coil, adjustment coil, copper
Shielding, detection coil and annular core；
The center control subsystem includes protection circuit, signal processing circuit, amplifier, FPGA, host computer, controller
And filter circuit；The protection circuit on one side ground connection, the other end are connected with the input terminal of signal processing circuit, the signal processing
One input terminal of the output end connection controller of circuit, the output of another input terminal connection amplifier of the controller
End, the input terminal of the output end connection filter circuit of the controller, the FPGA and host computer are connected with controller respectively；Institute
An input terminal for stating control subsystem centered on the input terminal of signal processing circuit is also connected with standard capacitance, the amplification
Another input terminal of control subsystem is connected with the output end of current comparator centered on the input terminal of device, the filtered electrical
An output end of control subsystem is connected with voltage-controlled current source centered on the output end on road；The controller of A end systems and the ends B
The controller of system is connected and is communicated by GPRS wireless networks；The center control subsystem realizes voltage measurement, difference
Dynamic formula current measurement, signal processing, control signal are sent out and transmission data processing.
It is previously described for the live detection and on-line monitoring system of EHV XLPE power cable insulation diagnosis, which is characterized in that
The magnetic screen is double " u "-shaped structure of mosaic, and material is 1mm thickness permalloys 1j79.
It is previously described for the live detection and on-line monitoring system of EHV XLPE power cable insulation diagnosis, which is characterized in that
The annular core outer diameter 250~3000mm, 220~270mm of internal diameter, 20~38mm of height, sectional area are 3~8cm2；It is described
Annular core material is 0.1mm thickness permalloy 1j85 bands.
It is previously described for the live detection and on-line monitoring system of EHV XLPE power cable insulation diagnosis, which is characterized in that
Described alihnment coil the number of turns is 2~10；The coarse adjustment coil turn is 50~150.
It is previously described for the live detection and on-line monitoring system of EHV XLPE power cable insulation diagnosis, which is characterized in that
Lead reversely turns around extraction along annular core circumference after wrapped one layer of the detection coil；The detection coil on-line monitoring is used
The number of turns is 1800~2300 circles, and live detection the number of turns is 8600~9400 circles.
It is previously described for the live detection and on-line monitoring system of EHV XLPE power cable insulation diagnosis, which is characterized in that
The center control subsystem is connect with data processing terminal by wirelessly or non-wirelessly mode.
The invention has the advantages that：The present invention is realized with loss current triple-frequency harmonics than the XLPE cable for criterion
Major insulation water-treeing state-detection is tested two sets of measuring systems of setting of cable head and end, can be by measuring circuit two
Differential type of the load current at end realizing compares measurement, and then realizes the measurement of cable insulation leakage current, and it is old to carry out cable water tree
Change accurate anticipation.Detachable, fixed difference current comparator is respectively adopted and obtains ultrahigh pressure cable core insulation leakage electricity
Stream information realizes cable loss factor and loss current harmonic component live detection, on-line monitoring.Reasonable design of the present invention, knot
Structure is simple, can realize in fortune extra-high-tension cable insulation live detection and on-line monitoring, the overall utilization rate of equipment is made effectively to carry
Height, while production efficiency is improved, reduce production cost.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Fig. 2 is the current comparator structural schematic diagram of the present invention.
Fig. 3 is the circuit diagram that voltage measurement is carried out using the present invention.
Fig. 4 is the schematic diagram that differential-current measurement is carried out using the present invention.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
A kind of live detection and on-line monitoring system for EHV XLPE power cable insulation diagnosis, overall structure such as Fig. 1
It is shown, including A end systems and B end systems, it is separately positioned on tested cable head and end, passes through GPRS wireless networks between the two
Network connects, and A end systems include current comparator, voltage-controlled current source, standard capacitor, center control subsystem with B end systems.
Inside A end systems and B end systems, current comparator is set on cable under test ontology, and one of center control subsystem is defeated
Enter the output end of end connection current comparator, another input terminal connects voltage to be measured, center control by standard capacitor
The output end of system is connected by voltage-controlled current source with the input terminal of current comparator.Center control subsystem in A end systems
It is also connect with data processing terminal, the center control subsystem of A end systems and the center control subsystem of B end systems pass through GPRS
Wireless network is connected and is communicated.
Current comparator is used using detachable or fixed difference current comparator, detachable difference current comparator
In live detection, fixed difference current comparator is for monitoring on-line, and current comparator structure is as shown in Fig. 2, including successively
Magnetic screen 11, alihnment coil 12, coarse adjustment coil 13, adjustment coil 14, copper shield 15, detection coil 16 and the annular fitted closely
Iron core 17.Magnetic screen 11 is double " u "-shaped structure of mosaic, and material is 1mm thickness permalloys 1j79.17 outer diameter 250 of annular core~
3000mm, 220~270mm of internal diameter, 20~38mm of height, sectional area are 3~8cm2；17 material of annular core is 0.1mm thickness slope
Not alloy 1j85 bands；12 the number of turns of alihnment coil is 2~10.13 the number of turns of coarse adjustment coil is 50~150.Detection coil 16 wrapped one
Lead reversely turns around extraction along 17 circumference of annular core after layer；16 on-line monitoring the number of turns of detection coil is 1800~2300
Circle, live detection the number of turns are 8600~9400 circles.
Center control subsystem includes protection circuit, signal processing circuit, amplifier, FPGA, host computer, controller and filter
Wave circuit；Protect circuit on one side ground connection, the other end is connected with the input terminal of signal processing circuit, the signal processing circuit it is defeated
Outlet connects an input terminal of controller, the output end of another input terminal connection amplifier of the controller, the control
The input terminal of the output end connection filter circuit of device processed；FPGA and host computer are connected with controller respectively.The signal processing electricity
An input terminal of control subsystem is connected with standard capacitance centered on the input terminal on road, the input terminal conduct of the amplifier
Another input terminal of center control subsystem is connected with the output end of current comparator, the output end conduct of the filter circuit
One output end of center control subsystem is connected with voltage-controlled current source；The controller of A end systems and the controller of B end systems are logical
GPRS wireless networks are crossed to be connected and communicated.The center control subsystem realizes that voltage measurement, differential-current measure, believe
Number processing, control signal send out and transmission data processing.
Using the present invention carry out voltage measurement when, principle as shown in figure 3, center control subsystem protection circuit and signal
Processing circuit constitutes voltage measurement subsystem together with standard capacitor, completes voltage measurement.The signal of center control subsystem
The input terminal of processing circuit connects voltage to be measured by standard capacitor, and the input terminal of signal processing circuit is also controlled by center
The protection circuit ground of subsystem, the output end of signal processing circuit are connected with the controller input terminal of center control subsystem,
Central control system is allow to acquire voltage value to be measured in real time.
When carrying out differential-current measurement using the present invention, principle is as shown in figure 4, current comparator, standard capacitor, pressure
Control protection circuit, signal processing circuit, amplifier, controller and the filter circuit of current source and center control subsystem structure together
Subsystem is measured at differential-current, differential-current is completed and measures.Current comparator is fixed on cable under test, electric current ratio
After amplifier amplification compared with device by collected cable load current signal by center control subsystem, the knot with voltage measurement
Fruit is sent into controller together, and controller is sent into pressure by operation output control signal after controlling the filtered circuit filtering of signal
Current source is controlled, voltage-controlled current source is to current comparator input offset current.
The center control subsystem at the ends B carries out point-to-point biography by the center control subsystem at GPRS wireless networks and the ends A
It is defeated, by the center control subsystem at the ends data deposit A.
Data processing terminal has loss supplemental characteristic processing function and diagnosis report systematic function, is controlled according to center
The data that subsystem provides realize the extraction of loss current third-harmonic component, carry out loss current triple-frequency harmonics, loss factor is sentenced
Fixed, comprehensive water tree diagnosis criterion assesses extra-high-tension cable state of insulation.
The course of work, both end voltage measure the output signal of subsystem and the output signal of current comparator as differential type
Current measurement system input quantity, is sent into controller, and controller output signal controls voltage-controlled current source output compensation electric current, compensation electricity
The output of comparator is flowed, realizes the measurement of the loss current of differential-current measuring system.GPRS wireless transmitting systems are by both ends
The measurement result of voltage and current is transmitted on the controller at the ends A, both controller synthesis data transmission to data processing terminal, number
According to processing terminal using loss current triple-frequency harmonics ratio as criterion, XLPE cable major insulation water-treeing state, assessment result are evaluated
And generate diagnosis report.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. live detection and on-line monitoring system for EHV XLPE power cable insulation diagnosis, which is characterized in that including respectively
A end systems and B end systems in tested cable head and end is set, and the A end systems pass through GPRS wireless networks with B end systems
Network connects, and the A end systems include current comparator, voltage-controlled current source, standard capacitor, center control with B end systems
System, the A end systems further include data processing terminal；
Inside A end systems and B end systems, the current comparator is set on cable under test ontology, center control
The output end of the input terminal connection current comparator of system, another input terminal connect electricity to be measured by standard capacitor
Pressure, the output end of the center control subsystem are connected by voltage-controlled current source with the input terminal of current comparator；In A end systems
Center control subsystem also connect with data processing terminal, the center control of the center control subsystems of A end systems and B end systems
Subsystem is connected and is communicated by GPRS wireless networks；
The current comparator include the magnetic screen fitted closely successively, alihnment coil, coarse adjustment coil, adjustment coil, copper shield,
Detection coil and annular core；
The center control subsystem includes protection circuit, signal processing circuit, amplifier, FPGA, host computer, controller and filter
Wave circuit；The protection circuit on one side ground connection, the other end are connected with the input terminal of signal processing circuit, the signal processing circuit
Output end connection controller an input terminal, the controller another input terminal connection amplifier output end, institute
The input terminal of the output end connection filter circuit of controller is stated, the FPGA and host computer are connected with controller respectively；The letter
An input terminal of control subsystem is also connected with standard capacitance centered on the input terminal of number processing circuit, the amplifier
Another input terminal of control subsystem is connected with the output end of current comparator centered on input terminal, the filter circuit
An output end of control subsystem is connected with voltage-controlled current source centered on output end；The controller and B end systems of A end systems
Controller be connected and communicated by GPRS wireless networks；The center control subsystem realizes voltage measurement, differential type
Current measurement, signal processing, control signal are sent out and transmission data processing.
2. the live detection and on-line monitoring system according to claim 1 for EHV XLPE power cable insulation diagnosis,
It is characterized in that, the magnetic screen is double " u "-shaped structure of mosaic, material is 1mm thickness permalloys 1j79.
3. the live detection and on-line monitoring system according to claim 1 for EHV XLPE power cable insulation diagnosis,
It is characterized in that, the annular core outer diameter 250~3000mm, 220~270mm of internal diameter, 20~38mm of height, sectional area 3
~8cm2；The annular core material is 0.1mm thickness permalloy 1j85 bands.
4. the live detection and on-line monitoring system according to claim 1 for EHV XLPE power cable insulation diagnosis,
It is characterized in that, described alihnment coil the number of turns is 2~10；The coarse adjustment coil turn is 50~150.
5. the live detection and on-line monitoring system according to claim 1 for EHV XLPE power cable insulation diagnosis,
It is characterized in that, lead reversely turns around extraction along annular core circumference after wrapped one layer of the detection coil；The detection line
Circle on-line monitoring the number of turns is 1800~2300 circles, and live detection the number of turns is 8600~9400 circles.
6. the live detection and on-line monitoring system according to claim 1 for EHV XLPE power cable insulation diagnosis,
It is characterized in that, the center control subsystem is connect with data processing terminal by wirelessly or non-wirelessly mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610261906.8A CN105785246B (en) | 2016-04-25 | 2016-04-25 | Live detection and on-Line Monitor Device for EHV XLPE power cable insulation diagnosis |
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| CN201610261906.8A CN105785246B (en) | 2016-04-25 | 2016-04-25 | Live detection and on-Line Monitor Device for EHV XLPE power cable insulation diagnosis |
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| CN105785246B true CN105785246B (en) | 2018-08-03 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106443368B (en) * | 2016-07-29 | 2023-08-15 | 扬州市第一人民医院 | Insulation detection device for surgical electrified appliance |
| CN107607821A (en) * | 2017-10-25 | 2018-01-19 | 广西电网有限责任公司电力科学研究院 | A kind of controllable middle pressure XLPE cable ageing test apparatus of harmonic content |
Citations (4)
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|---|---|---|---|---|
| US6433552B1 (en) * | 1999-04-21 | 2002-08-13 | Bruce T. Williams | Floating plate voltage monitor |
| CN104977513A (en) * | 2015-06-30 | 2015-10-14 | 国家电网公司 | High-voltage cable outer sheath insulation state on-line monitoring system and control method thereof |
| CN105445526A (en) * | 2015-11-20 | 2016-03-30 | 国家电网公司 | Structure for measuring insulation leakage current of single-core cable in operation |
| CN205562734U (en) * | 2016-04-25 | 2016-09-07 | 国网江苏省电力公司电力科学研究院 | Be used for insulating diagnostic electrified detection and on -line monitoring device of ultrahigh -voltage power cable |
-
2016
- 2016-04-25 CN CN201610261906.8A patent/CN105785246B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6433552B1 (en) * | 1999-04-21 | 2002-08-13 | Bruce T. Williams | Floating plate voltage monitor |
| CN104977513A (en) * | 2015-06-30 | 2015-10-14 | 国家电网公司 | High-voltage cable outer sheath insulation state on-line monitoring system and control method thereof |
| CN105445526A (en) * | 2015-11-20 | 2016-03-30 | 国家电网公司 | Structure for measuring insulation leakage current of single-core cable in operation |
| CN205562734U (en) * | 2016-04-25 | 2016-09-07 | 国网江苏省电力公司电力科学研究院 | Be used for insulating diagnostic electrified detection and on -line monitoring device of ultrahigh -voltage power cable |
Non-Patent Citations (2)
| Title |
|---|
| 交流叠加法带电测试XLPE电缆绝缘性能的研究;周志成等;《高电压技术》;20050131;第31卷(第1期);第40-41、46页 * |
| 单芯XLPE电缆金属护套绝缘在线监测研究;周志成等;《高压电器》;20060430;第42卷(第2期);第90-92页 * |
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