CN208156086U - Direct current cable space charge measurement system - Google Patents
Direct current cable space charge measurement system Download PDFInfo
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- CN208156086U CN208156086U CN201820745187.1U CN201820745187U CN208156086U CN 208156086 U CN208156086 U CN 208156086U CN 201820745187 U CN201820745187 U CN 201820745187U CN 208156086 U CN208156086 U CN 208156086U
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- direct current
- current cables
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- space charge
- temperature
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- 238000005259 measurement Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000009413 insulation Methods 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 22
- 229910052782 aluminium Inorganic materials 0.000 claims description 22
- 239000004411 aluminium Substances 0.000 claims description 22
- 230000005611 electricity Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 2
- 239000004020 conductor Substances 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- Testing Relating To Insulation (AREA)
Abstract
The utility model discloses a direct current cable space charge measurement system, include: the direct current power supply is connected with the terminal of the direct current cable to be detected and used for outputting high-voltage direct current to the direct current cable to be detected; the pulse generator is connected with the direct current cable to be tested or the terminal thereof and is used for sending a high-voltage pulse signal to the direct current cable to be tested; the heating unit is used for heating the wire core of the direct current cable to be tested to a set temperature; and the space charge measuring unit is used for measuring the space charge generated by the tested direct current cable. The utility model discloses a coupling current heating DC cable has realized from cable core to cable insulation layer by interior to exterior heat transfer's temperature field to controlled the cable surface temperature through the basin, formed inside and outside two-layer accuse temperature, controlled the temperature gradient of cable conductor to insulating surface, simulated DC cable's true operating mode.
Description
Technical field
The utility model relates to technical field of power systems more particularly to a kind of direct current cables space charge measuring systems.
Background technique
Pulse electroacoustic method is a kind of space charge measurement means being widely used at present.Pulse electroacoustic method can be observed directly
It flows space charge of the cable insulation under direct current high field intensity and gathers behavior.Due to cable be normally operated in it is different at a temperature of, and
And the temperature gradient in cable insulation can change with the variation of environment, therefore measure the space charge tool under different temperatures gradient
There is very strong realistic meaning.
The current space charge measuring system based on pulse electroacoustic method is typically employed in lower electrode installation constant temperature source and utilizes
Temperature field heat-transferring method heats cable.For example, heating quilt in such a way that heating coil coats lower electrode groove offer temperature field
Test article；Or it is heated using constant temperature source to product to be tested.It is this that temperature field conduction heating is utilized using high temperature source generation high temperature
Mode, because heating source is normally placed in lower electrode, thus to make sensor bear high temperature, and this heating method be by
Heat outside to inside, diabatic process is different from inside to outside from actual cable, to affect sensor accuracy, and make to measure situation with
It is not inconsistent actually, causes measurement result inaccurate.
Utility model content
The technical problem to be solved by the utility model is to the utility model provides a kind of direct current cables space charge survey
Amount system tests unstable disadvantage to overcome at high temperature, more meets operating condition.
In order to solve the above-mentioned technical problem, the utility model provides a kind of direct current cables space charge measuring system, including：
DC power supply is connected with the terminal of tested direct current cables, for exporting high voltage direct current to tested direct current cables；
Impulse generator is connected with tested direct current cables or its terminal, for sending high pressure to tested direct current cables
Pulse signal；
Heating unit, for the core of tested direct current cables to be heated to set temperature；
Space charge measurement unit, the space charge for generating to tested direct current cables measure.
Wherein, the space charge measurement unit includes：
Sink for placing tested direct current cables, and holds cooling water to control the surface temperature of tested direct current cables；
Lower electrode aluminium sheet is located at below the sink, for contacting and fixing the sink；
Cable cleat is connected, for tested direct current cables to be fixed in the sink with the lower electrode aluminium sheet；
Piezoelectric transducer is tightly attached to below the lower electrode aluminium sheet, the space electricity generated for acquiring tested direct current cables
The acoustical signal that lotus is issued after being motivated by the impulse generator, and the acoustical signal is converted into electric signal；
Oscillograph is connected with the piezoelectric transducer, for acquiring the electric signal of the piezoelectric transducer output.
Wherein, the cable cleat has an arcwall face, and the outer rim of radian and tested direct current cables matches, the arc
Shape is facing towards the lower electrode aluminium sheet upper surface.
Wherein, the lower electrode aluminium sheet is equipped with multiple mounting holes, and the cable cleat passes through long bolt and the mounting hole
Be spirally connected to realize the connection of itself and the lower electrode aluminium sheet.
Wherein, it is additionally provided with thermal insulation layer on the lower electrode aluminium sheet, for the high temperature of tested direct current cables to be isolated to the pressure
Electric transducer transmitting.
Wherein, the heating unit includes：
Couple current heating unit is connected with the core of tested direct current cables, for passing through couple current coil to quilt
The core for surveying direct current cables is heated；
Couple current control unit is connected with the couple current heating unit, for by output voltage height come
Size of current caused by couple current coil is controlled, and adjusts induced electricity of the couple current coil in tested direct current cables
The size of stream.
Wherein, the direct current cables space charge measuring system further includes：
Temperature control unit, for controlling it and being maintained at when the core of tested direct current cables is heated to set temperature
Set temperature.
Wherein, the temperature control unit includes：
Temperature sensor is connected with the core of tested direct current cables, the temperature of the core for monitoring tested direct current cables
Degree；
Current sensor, for acquiring induced current of the couple current coil in tested direct current cables；
Temperature controller is connected with the temperature sensor, for monitoring tested direct current in the temperature sensor
When the temperature of the core of cable and the set temperature difference, control signal is exported to the couple current control unit, to adjust
Save the height of the couple current control unit output voltage.
Wherein, the couple current control unit is a pressure regulator.
Wherein, the impulse generator has capacitance, the high voltage direct current issued for completely cutting off the DC power supply.
The beneficial effect of the utility model embodiment is：Direct current cables is heated by couple current, is realized from cable
Core controls cable surface temperature to the temperature field of cable insulation conducted heat from inside to outside, and by sink, inside and outside formation
Two layers of temperature control controls cable conductor to the temperature gradient of insulating surface, simulates the real working condition of direct current cables.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of direct current cables space charge measuring system of the utility model embodiment.
Fig. 2 is the structural schematic diagram of the utility model embodiment Space-charge measuring unit.
Specific embodiment
The explanation of following embodiment be with reference to attached drawing, can be to the particular implementation implemented to example the utility model
Example.
It please referring to shown in Fig. 1, the utility model embodiment provides a kind of direct current cables space charge measuring system, including：
DC power supply 1 is connected with the terminal of tested direct current cables 9, for exporting high voltage direct current to tested direct current cables 9
Electricity；
Impulse generator 2 is connected with tested direct current cables 9 or its terminal, for sending height to tested direct current cables 9
Pressure pulse signal；
Heating unit, for the core 90 of tested direct current cables 9 to be heated to set temperature；
Space charge measurement unit 3, the space charge for generating to tested direct current cables 9 measure.
Specifically, incorporated by reference to shown in Fig. 2, space charge measurement unit 3 includes：
Sink 15 for placing tested direct current cables 9, and holds cooling water to control the surface temperature of tested direct current cables 9
Degree；
Lower electrode aluminium sheet 11 is located at 15 lower section of sink, for contacting and fixing sink 15；
Cable cleat 13 is connected with lower electrode aluminium sheet 11, for tested direct current cables 9 to be fixed in sink 15；
Piezoelectric transducer 12, is tightly attached to lower 11 lower section of electrode aluminium sheet, the space electricity generated for acquiring tested direct current cables 9
The acoustical signal that lotus is issued after being motivated by impulse generator 2, and the acoustical signal is converted into electric signal；
Oscillograph 14 is connected with piezoelectric transducer 12, for acquiring the electric signal of the output of piezoelectric transducer 12.
Lower electrode aluminium sheet 11 is provided with 4 mounting holes, and cable cleat 13 is connected by 4 long bolts with lower electrode aluminium sheet 11
It connects.Cable cleat 13 also has an arcwall face, and the outer rim of radian and tested direct current cables 9 matches, and the arcwall face is under
11 upper surface of electrode aluminium sheet.The diameter of the arcwall face is 10mm-100mm.Piezoelectric transducer 12 is located at lower 11 lower section of electrode aluminium sheet.
Lower electrode aluminium sheet 11 has one layer of thermal insulation layer 10 above, for avoiding the high temperature of tested direct current cables 9 from transmitting to piezoelectric transducer 12,
Thermal insulation layer 10 uses carbon fibre material, can remove when tested 9 surface temperature of direct current cables is not high.
Heating unit includes：
Couple current heating unit 4 is connected with the core 90 of tested direct current cables 9, for passing through couple current coil
The core 90 of tested direct current cables 9 is heated；
Couple current control unit 5 is connected with the couple current heating unit 4, for passing through output voltage height
To control size of current caused by couple current coil, and sense of the adjusting couple current coil in tested direct current cables 9
Answer the size of electric current.In the present embodiment, couple current control unit 5 is a pressure regulator.
In order to be always maintained at when the core 90 of tested direct current cables 9 being enable to be heated to set temperature, the present embodiment is also set
There is temperature control unit, for it being controlled and being maintained at setting when the core 90 of tested direct current cables 9 is heated to set temperature
Temperature.
Further, temperature control unit includes：
Temperature sensor 8 is connected with the core 90 of tested direct current cables 9, for monitoring the core of tested direct current cables 9
90 temperature；
Current sensor 7, for acquiring induced current of the couple current coil in tested direct current cables 9；
Temperature controller 6 is connected with the temperature sensor 8, tested straight for monitoring in the temperature sensor 8
When the temperature and the set temperature difference of the core 90 of galvanic electricity cable 9, control letter is exported to the couple current control unit 5
Number, to adjust the height of 5 output voltage of couple current control unit, to control the induced electricity in tested direct current cables 9
Size is flowed, to achieve the purpose that heat tested direct current cables 9 to set temperature.
Further, impulse generator 2 has capacitance, for completely cutting off the high voltage direct current of the sending of DC power supply 1.
The utility model is to measure the space under the different temperatures for being higher than environment temperature in high-voltage DC cable insulating layer
Specifically when measuring the space charge of direct current cables, it is tested straight that cooling water control is first added in distribution of charges in sink 15
Then the temperature on 9 surface of galvanic electricity cable starts couple current heating unit 4 and couple current control unit 5, direct current cables to be tested
After 9 90 temperature of core rises to set temperature, control couple current is maintained at suitable numerical value to maintain the temperature, to control
Temperature gradient processed；Then starting high-voltage DC power supply 1 issues high voltage direct current, and the high voltage direct current is by being tested direct current cables
Terminal is output in the core 90 of tested direct current cables 9, and starting impulse generator 2 issues high-voltage pulse signal, in high direct voltage
Under the action of electric field and temperature field, space charge can be generated in the insulating layer of tested direct current cables 9, space charge is by high pressure
After pulse signal excitation, small vibration can be generated, which generates acoustical signal；Piezoelectric transducer 12 detects the acoustical signal
Afterwards, it converts electric signal for the acoustical signal to export to oscillograph 14, oscillograph 14 is transmitted in computer after acquiring the signal.
By above description it is found that the utility model embodiment bring beneficial effect is：It is heated by couple current
Direct current cables realizes the temperature field conducted heat from inside to outside from cable core to cable insulation, and controls cable by sink
Surface temperature controls cable conductor to the temperature gradient of insulating surface, simulates direct current cables by inside and outside two layers of temperature control
Real working condition.
Above disclosures are merely preferred embodiments of the utility model, the utility model cannot be limited with this certainly
Interest field, therefore equivalent variations made according to the claim of the utility model still fall within the scope of the utility model.
Claims (10)
1. a kind of direct current cables space charge measuring system, which is characterized in that including：
DC power supply is connected with the terminal of tested direct current cables, for exporting high voltage direct current to tested direct current cables；
Impulse generator is connected with tested direct current cables or its terminal, for sending high-voltage pulse to tested direct current cables
Signal；
Heating unit, for the core of tested direct current cables to be heated to set temperature；
Space charge measurement unit, the space charge for generating to tested direct current cables measure.
2. direct current cables space charge measuring system according to claim 1, which is characterized in that the space charge measurement
Unit includes：
Sink for placing tested direct current cables, and holds cooling water to control the surface temperature of tested direct current cables；
Lower electrode aluminium sheet is located at below the sink, for contacting and fixing the sink；
Cable cleat is connected, for tested direct current cables to be fixed in the sink with the lower electrode aluminium sheet；
Piezoelectric transducer, is tightly attached to below the lower electrode aluminium sheet, the space charge quilt generated for acquiring tested direct current cables
The acoustical signal issued after the impulse generator excitation, and the acoustical signal is converted into electric signal；
Oscillograph is connected with the piezoelectric transducer, for acquiring the electric signal of the piezoelectric transducer output.
3. direct current cables space charge measuring system according to claim 2, which is characterized in that the cable cleat has
The outer rim of one arcwall face, radian and tested direct current cables matches, and the arcwall face is towards the lower electrode aluminium sheet upper surface.
4. direct current cables space charge measuring system according to claim 2, which is characterized in that the lower electrode aluminium sheet is set
There are multiple mounting holes, the cable cleat realizes itself and the lower electrode aluminium sheet by being spirally connected for long bolt and the mounting hole
Connection.
5. direct current cables space charge measuring system according to claim 2, which is characterized in that on the lower electrode aluminium sheet
It is additionally provided with thermal insulation layer, the high temperature for tested direct current cables to be isolated is transmitted to the piezoelectric transducer.
6. direct current cables space charge measuring system according to claim 1, which is characterized in that the heating unit packet
It includes：
Couple current heating unit is connected with the core of tested direct current cables, for straight to being tested by couple current coil
The core of galvanic electricity cable is heated；
Couple current control unit is connected with the couple current heating unit, for being controlled by output voltage height
Size of current caused by couple current coil, and adjusting couple current coil are faradic in tested direct current cables
Size.
7. direct current cables space charge measuring system according to claim 6, which is characterized in that further include：
Temperature control unit, for controlling it and being maintained at setting when the core of tested direct current cables is heated to set temperature
Temperature.
8. direct current cables space charge measuring system according to claim 7, which is characterized in that the temperature control unit
Including：
Temperature sensor is connected with the core of tested direct current cables, the temperature of the core for monitoring tested direct current cables；
Current sensor, for acquiring induced current of the couple current coil in tested direct current cables；
Temperature controller is connected with the temperature sensor, for monitoring tested direct current cables in the temperature sensor
Core temperature and when the set temperature difference, control signal is exported to the couple current control unit, to adjust
State the height of couple current control unit output voltage.
9. direct current cables space charge measuring system according to claim 6, which is characterized in that the couple current control
Unit is a pressure regulator.
10. direct current cables space charge measuring system according to claim 1, which is characterized in that the impulse generator
With capacitance, for completely cutting off the high voltage direct current of the DC power supply sending.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820745187.1U CN208156086U (en) | 2018-05-18 | 2018-05-18 | Direct current cable space charge measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820745187.1U CN208156086U (en) | 2018-05-18 | 2018-05-18 | Direct current cable space charge measurement system |
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| Publication Number | Publication Date |
|---|---|
| CN208156086U true CN208156086U (en) | 2018-11-27 |
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| CN201820745187.1U Active CN208156086U (en) | 2018-05-18 | 2018-05-18 | Direct current cable space charge measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508286A (en) * | 2018-05-18 | 2018-09-07 | 深圳供电局有限公司 | Direct current cable space charge measurement system |
-
2018
- 2018-05-18 CN CN201820745187.1U patent/CN208156086U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508286A (en) * | 2018-05-18 | 2018-09-07 | 深圳供电局有限公司 | Direct current cable space charge measurement system |
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