CN108508286A - A kind of direct current cables space charge measuring system - Google Patents
A kind of direct current cables space charge measuring system Download PDFInfo
- Publication number
- CN108508286A CN108508286A CN201810480746.5A CN201810480746A CN108508286A CN 108508286 A CN108508286 A CN 108508286A CN 201810480746 A CN201810480746 A CN 201810480746A CN 108508286 A CN108508286 A CN 108508286A
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- Prior art keywords
- direct current
- current cables
- tested
- space charge
- cables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/24—Arrangements for measuring quantities of charge
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention discloses 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-voltage pulse signal to tested direct current cables；Heating unit, for the core of tested direct current cables to be heated to set temperature；Space charge measurement unit, for being measured to being tested the space charge that direct current cables generates.The present invention heats direct current cables by couple current, realize the temperature field conducted heat from inside to outside from cable core to cable insulation, and cable surface temperature is controlled by sink, form inside and outside two layers of temperature control, cable conductor is controlled to the temperature gradient of insulating surface, simulates the real working condition of direct current cables.
Description
Technical field
The present invention relates to technical field of power systems more particularly to a kind of direct current cables space charge measuring systems.
Background technology
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.It is normally operated in due to cable at different temperature, 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 collar coats lower electrode groove offer temperature field
Test article；Or it is heated to product to be tested using constant temperature source.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, so sensor to be made to bear high temperature, and this mode of heating be by
Heat outside to inside, diabatic process is different from inside to outside from actual cable, to affect sensor accuracy, and make measurement situation with
It is not inconsistent actually, causes measurement result inaccurate.
Invention content
Technical problem to be solved by the present invention lies in, the present invention provides a kind of direct current cables space charge measuring system,
Unstable disadvantage is tested at high temperature to overcome, and more meets operating condition.
In order to solve the above technical problem, the present invention provides a kind of direct current cables space charge measuring systems, 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, for being measured to being tested the space charge that direct current cables generates.
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 with the lower electrode aluminium sheet, for tested direct current cables to be fixed in the sink；
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 sent out after the impulse generator excitation, and the acoustical signal is converted into electric signal；
Oscillograph is connected with the piezoelectric transducer, the electric signal for acquiring the piezoelectric transducer output.
Wherein, there is the cable cleat arcwall face, the outer rim of radian and tested direct current cables to match, 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 transmits.
Wherein, the heating unit 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.
Wherein, the direct current cables space charge measuring system further includes：
Temperature control unit, for when the core of tested direct current cables is heated to set temperature, controlling it and being maintained at setting
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；
Current sensor, for acquiring induced current of the couple current coil in tested direct current cables；
Temperature controller is connected with the temperature sensor, in the temperature sensor monitors to tested direct current cables
Core temperature and the set temperature difference when, control signal is exported to the couple current control unit, to adjust
State the height of couple current control unit output voltage.
Wherein, the coupling cable control unit is a pressure regulator.
Wherein, the impulse generator has capacitance, the high voltage direct current sent out for completely cutting off the DC power supply.
The advantageous effect of the embodiment of the present invention is：Direct current cables is heated by couple current, is realized from cable core
Cable surface temperature is controlled to the temperature field of cable insulation conducted heat from inside to outside, and by sink, is formed two layers inside and outside
Temperature control controls cable conductor to the temperature gradient of insulating surface, simulates the real working condition of direct current cables.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of direct current cables space charge measuring system of the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of Space-charge measuring unit of the embodiment of the present invention.
Specific implementation mode
The explanation of following embodiment is refer to the attached drawing, can be to the specific embodiment implemented to the example present invention.
It please referring to shown in Fig. 1, the embodiment of the present invention 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；
Impulse generator 2 is connected with tested direct current cables 9 or its terminal, for sending high-tension pulse to tested direct current cables 9
Rush signal；
Heating unit, for the core 90 of tested direct current cables 9 to be heated to set temperature；
Space charge measurement unit 3, for being measured to being tested the space charge that direct current cables 9 generates.
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；
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 11 lower section of lower electrode aluminium sheet, the space charge quilt for acquiring the generation of tested direct current cables 9
The acoustical signal that impulse generator 2 is sent out after encouraging, and the acoustical signal is converted into electric signal；
Oscillograph 14 is connected with piezoelectric transducer 12, the electric signal for acquiring 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.Also there is cable cleat 13 arcwall face, the outer rim of radian and tested direct current cables 9 to match, and the arcwall face is under
11 upper surface of electrode aluminium sheet.A diameter of 10mm-100mm of the arcwall face.Piezoelectric transducer 12 is located at 11 lower section of lower 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 being transmitted to piezoelectric transducer 12,
Thermal insulation layer 10 uses carbon fibre material, can be removed 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 to quilt
The core 90 for surveying direct current cables 9 is heated；
Couple current control unit 5 is connected with the couple current heating unit 4, for being controlled by output voltage height
Size of current caused by couple current coil processed, and adjust induced electricity of the couple current coil in tested direct current cables 9
The size of stream.In the present embodiment, coupling cable 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 when the core 90 of tested direct current cables 9 is heated to set temperature, controlling it and being maintained at setting
Temperature.
Further, temperature control unit includes：
Temperature sensor 8 is connected with the core 90 of tested direct current cables 9, the core 90 for monitoring tested direct current cables 9
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, for monitoring tested direct current in the temperature sensor 8
When the temperature of the core 90 of cable 9 is with the set temperature difference, control signal is exported to the couple current control unit 5, is come
The height of 5 output voltage of couple current control unit is adjusted, it is big to control the induced current being tested in direct current cables 9
It is small, arrive set temperature to achieve the purpose that heating is tested direct current cables 9.
Further, impulse generator 2 has capacitance, the high voltage direct current sent out for completely cutting off DC power supply 1.
The present invention is measuring the space charge being higher than under the different temperatures of environment temperature in high-voltage DC cable insulating layer
Distribution specifically when measuring the space charge of direct current cables, is first added cooling water control in sink 15 and is tested direct current
Then the temperature on 9 surface of cable starts couple current heating unit 4 and couple current control unit 5, direct current cables 9 to be tested
After 90 temperature rise to set temperature of core, control couple current is maintained at suitable numerical value to maintain the temperature, to control
Temperature gradient；Then start high-voltage DC power supply 1 and send out high voltage direct current, the end which passes through tested direct current cables
End is output in the core 90 of tested direct current cables 9, and starting impulse generator 2 sends out high-voltage pulse signal, in DC high-voltage
Under the action of field and temperature field, space charge is will produce in the insulating layer of tested direct current cables 9, space charge is by high-tension pulse
After rushing signal excitation, small vibration is will produce, which generates acoustical signal；After piezoelectric transducer 12 detects the acoustical signal,
The acoustical signal is converted to electric signal output to oscillograph 14, oscillograph 14 is transmitted to after acquiring the signal in computer.
By above description it is found that the advantageous effect that the embodiment of the present invention is brought is：Direct current is heated by couple current
Cable realizes the temperature field conducted heat from inside to outside from cable core to cable insulation, and controls cable surface by sink
Temperature controls cable conductor to the temperature gradient of insulating surface, simulates the true of direct current cables by inside and outside two layers of temperature control
Operating mode.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
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, for being measured to being tested the space charge that direct current cables generates.
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 with the lower electrode aluminium sheet, for tested direct current cables to be fixed in the sink；
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 sent out after the impulse generator excitation, and the acoustical signal is converted into electric signal；
Oscillograph is connected with the piezoelectric transducer, the electric signal for acquiring 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 when the core of tested direct current cables is heated to set temperature, controlling it and being maintained at setting
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, in the temperature sensor monitors to tested direct current cables
Core temperature and the set temperature difference when, 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 coupling cable 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, the high voltage direct current that is sent out for completely cutting off the DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480746.5A CN108508286A (en) | 2018-05-18 | 2018-05-18 | A kind of direct current cables space charge measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480746.5A CN108508286A (en) | 2018-05-18 | 2018-05-18 | A kind of direct current cables space charge measuring system |
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| Publication Number | Publication Date |
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| CN108508286A true CN108508286A (en) | 2018-09-07 |
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ID=63400901
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810480746.5A Pending CN108508286A (en) | 2018-05-18 | 2018-05-18 | A kind of direct current cables space charge measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007161A (en) * | 2019-04-10 | 2019-07-12 | 国网浙江省电力有限公司舟山供电公司 | A kind of method of direct current cables insulating space distribution of charges under measurement different temperatures |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472318A (en) * | 2013-09-03 | 2013-12-25 | 国家电网公司 | Direct-current cable space charge measuring system |
| CN104297575A (en) * | 2014-10-14 | 2015-01-21 | 中国南方电网有限责任公司电网技术研究中心 | PEA space charge measurement system and method under full-size high-voltage direct current cable temperature control gradient |
| CN208156086U (en) * | 2018-05-18 | 2018-11-27 | 深圳供电局有限公司 | A kind of direct current cables space charge measuring system |
-
2018
- 2018-05-18 CN CN201810480746.5A patent/CN108508286A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472318A (en) * | 2013-09-03 | 2013-12-25 | 国家电网公司 | Direct-current cable space charge measuring system |
| CN104297575A (en) * | 2014-10-14 | 2015-01-21 | 中国南方电网有限责任公司电网技术研究中心 | PEA space charge measurement system and method under full-size high-voltage direct current cable temperature control gradient |
| CN208156086U (en) * | 2018-05-18 | 2018-11-27 | 深圳供电局有限公司 | A kind of direct current cables space charge measuring system |
Non-Patent Citations (1)
| Title |
|---|
| 杜伯学等: "采用温差法的１０ｋＶ交联聚乙烯电缆水树老化评估", 《高电压技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007161A (en) * | 2019-04-10 | 2019-07-12 | 国网浙江省电力有限公司舟山供电公司 | A kind of method of direct current cables insulating space distribution of charges under measurement different temperatures |
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Application publication date: 20180907 |
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