CN107895609A - A kind of method for increasing high voltage power cable service voltage species - Google Patents
A kind of method for increasing high voltage power cable service voltage species Download PDFInfo
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- CN107895609A CN107895609A CN201711131094.6A CN201711131094A CN107895609A CN 107895609 A CN107895609 A CN 107895609A CN 201711131094 A CN201711131094 A CN 201711131094A CN 107895609 A CN107895609 A CN 107895609A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/028—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients with screen grounding means, e.g. drain wires
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Abstract
A kind of method for increasing high voltage power cable service voltage species.It is included in the position that the insulating barrier inside radius of cylinder single high voltage power cable is c and sets up a metal sleeve；The center of circle of the normal direction projection circle of metal sleeve overlaps with the center of circle of conductor；Metal sleeve built in cylinder single high voltage power cable is connected by binding post with low-voltage device in switch cubicle, as low-voltage alternating current power supply to low-voltage device power etc. step.Effect of the present invention：Low-voltage alternating current power supply needed for low-voltage device directly draws from high-tension cable built-in metal sleeve pipe and connect in switch cubicle, can simplify low-pressure system in original transformer station, saves the costs of equipment such as station local coordinate frame, low-voltage alternating-current screen；Control number of cables and its fee of material and operating expenses are greatly reduced, effectively reduces electricity transmitting and converting construction cost of investment；Prevent, because the low-tension supply in transformer station breaks down, to cause the accident risk of low-voltage device dead electricity in switch cubicle.
Description
Technical field
The invention belongs to power supply technical field, increases high voltage power cable service voltage species more particularly to one kind
Method.
Background technology
Currently used cylinder single high voltage power cable mainly include conductor, the insulating barrier that is coated on outside conductor and
The grounded metallic shield layer being coated on outside insulating barrier.But this traditional cylinder single high voltage power cable can only provide one kind
Operating voltage, the voltage determine the thickness of insulating barrier, numerically directly proportional to the logarithm of thickness of insulating layer.For being arranged in
For the switch cubicle at high voltage power cable both ends, power supply needed for its internal all kinds of low-voltage device can not directly be powered by cable,
Also need the low-tension supply in Yin Jie transformer stations.This can bring two problems：First, cause secondary connection in transformer station complicated, and connect
The material of line and construction will all cause cost of investment to raise；If the low-tension supply the 2, in transformer station breaks down, institute can be caused
There is device dead electricity in switch cubicle, easy proximity switch malfunction or tripping, this can all expand accident scope, cause unnecessary damage
Lose.And therefore state's net almost can all sustain a great loss every year.
The content of the invention
In order to solve the above problems, it is an object of the invention to provide one kind to increase high voltage power cable service voltage species
Method.
In order to achieve the above object, the method for increase high voltage power cable service voltage species provided by the invention includes pressing
The following steps that order is carried out：
Step 1) is by conductor, the insulating barrier being coated on outside conductor and the grounded metal screen being coated on outside insulating barrier
A metal sleeve is set up in the position that the insulating barrier inside radius for covering the cylinder single high voltage power cable of layer composition is c；Metallic sheath
The center of circle of the normal direction projection circle of pipe is overlapped with the center of circle of conductor, and metal sleeve can be changed with connecing by adjusting the radius c of metal sleeve
The magnitude of voltage of ground metallic shield interlayer, single cylinder single high voltage power cable is set to provide multiple voltage simultaneously；
Metal sleeve built in cylinder single high voltage power cable is passed through low pressure in binding post and switch cubicle by step 2)
Device connects, and is powered as low-voltage alternating current power supply to low-voltage device；It is built-in by this while high voltage power transmission demand is met
Metal sleeve is powered to the low-voltage device of the inside switch cabinet at both ends.
In step 1), the radius c of described metal sleeve calculation formula is：
In formula：U2：The magnitude of voltage of built-in sleeve pipe and grounded metallic shield interlayer, calculation formula are as follows：
Umax：The maximum working voltage of conductor and grounded metallic shield interlayer, calculation formula are as follows：
a：The radius of conductor
b：The radius of grounded metallic shield layer.
The method of increase high voltage power cable service voltage species provided by the invention has the advantages that：
First, low-voltage alternating current power supply needed for low-voltage device directly draws from the metal sleeve built in high-tension cable and connect in switch cubicle,
Low-pressure system in original transformer station can be simplified, saves the costs of equipment such as station local coordinate frame, low-voltage alternating-current screen；Drop significantly
Low control number of cables and its fee of material and operating expenses, effectively reduce electricity transmitting and converting construction cost of investment；
2nd, prevented, because the low-tension supply in transformer station breaks down, to cause the thing of low-voltage device dead electricity in switch cubicle
Therefore risk.Every cable is independently-powered, will not occur because the accident that certain line fault causes transformer station all to have a power failure；
3rd, secondary connection in transformer station is simplified, reduces wiring error rate, accelerates engineering construction progress.
Brief description of the drawings
Fig. 1 is high by the applicable cylinder single of the method for increase high voltage power cable service voltage species provided by the invention
Piezoelectric forces cable normal direction perspective view.
In figure：1st, grounded metallic shield layer, 2, insulating barrier, 3, conductor, 4, built-in sleeve pipe.
Embodiment
Below in conjunction with the accompanying drawings with specific embodiment to increase high voltage power cable service voltage species provided by the invention
Method is described in detail.
The method of increase high voltage power cable service voltage species provided by the invention includes the following step carried out in order
Suddenly：
Step 1) by conductor, the insulating barrier being coated on outside conductor and is coated on outside insulating barrier as shown in Figure 1
Grounded metallic shield layer composition cylinder single high voltage power cable the inside radius of insulating barrier 2 be c position set up a gold
Belong to sleeve pipe 4；The center of circle of the normal direction projection circle of metal sleeve 4 overlaps with the center of circle of conductor 3, and the radius c of regulation metal sleeve 4 can
On the premise of insulating materials dosage is constant, changes the voltage extremity distribution situation in insulating barrier 2, make cylinder single high-tension electricity
Cable can provide multiple voltage simultaneously；
Metal sleeve 4 built in cylinder single high voltage power cable is passed through low pressure in binding post and switch cubicle by step 2)
Device connects, and is powered as low-voltage alternating current power supply to low-voltage device；It is built-in by this while high voltage power transmission demand is met
Low-voltage device power supply of the metal sleeve 4 to the inside switch cabinet at both ends.
In step 1), the radius c of described metal sleeve 4 computational methods are as follows：
Following parameters are set first：
a：The radius of conductor 3；
b：The radius of grounded metallic shield layer 1；
EM：The breakdown field strength of insulating barrier 2；
τ：The unit length electric charge of conductor 3；
ε：The dielectric constant of insulating barrier 2,
σb：The inner surface surface density of charge of grounded metallic shield layer 1；
c：The radius of metal sleeve 4；
U：Voltage between conductor 3 and grounded metallic shield layer 1；
U2：Voltage between metal sleeve 4 and grounded metallic shield layer 1；
1.1) when calculating non-built-in metal sleeve pipe, the maximum working voltage of cylinder single high voltage power cable inner wire 3：
Conductor 3 is that electric-field intensity at r is in radius：
Wherein,For unit direction vector, its direction is to point to infinite point by the center of circle of conductor 3.
It is in the electric-field intensity extreme value that the edge of conductor 3 obtains：
Voltage between conductor 3 and grounded metallic shield layer 1：
To make full use of insulating materials, make Emax=EM, then the maximum working voltage between conductor 3 and grounded metallic shield layer 1
For：
1.2) after calculating built-in metal sleeve pipe 4, the voltage extremity between metal sleeve 4 and grounded metallic shield layer 1：
Voltage computing formula between metal sleeve 4 and grounded metallic shield layer 1 is：
During r=c, the magnitude of voltage between metal sleeve 4 and grounded metallic shield layer 1 is：
From formula 6., U2It is only relevant with the radius c of metal sleeve 4, adjust the radius c of metal sleeve 4, thus it is possible to vary gold
Belong to the magnitude of voltage U between sleeve pipe 4 and grounded metallic shield layer 12Numerical value.
Through deriving, the calculation formula for determining the radius c of metal sleeve 4 is：
In formula：U2：Magnitude of voltage between built-in sleeve pipe 4 and grounded metallic shield layer 1, calculation formula are as follows：
Umax：Maximum working voltage between conductor 3 and grounded metallic shield layer 1, calculation formula are as follows：
a：The radius of conductor 3
b：The radius of grounded metallic shield layer 1.
Said below by taking crosslinked polyetylene insulated polyvinyl chloride boot power cable YJV-35kV-1 × 50 of copper core as an example
Bright, its major parameter is：A=4mm, b=39mm, then 3. obtained by formula：
Assuming that voltage needed for its inside switch cabinet low-voltage device is 220V, then 6. obtained by formula：
To sum up, the metal sleeve that one layer of radius of addition is 38.04mm in the insulating barrier 2 of cylinder single high voltage power cable
4, the metal sleeve 4 can provide 220V voltages, after busbar is transferred, be used for the low-voltage device of inside switch cabinet.
Claims (2)
- A kind of 1. method for increasing high voltage power cable service voltage species, it is characterised in that：Described increase high-tension electricity electricity The method of cable service voltage species includes the following steps carried out in order：Step 1) is by conductor, the insulating barrier being coated on outside conductor and the grounded metallic shield layer being coated on outside insulating barrier Insulating barrier (2) inside radius of the cylinder single high voltage power cable of composition is that a metal sleeve (4) is set up in c position；Metal The center of circle of the normal direction projection circle of sleeve pipe (4) overlaps with the center of circle of conductor (3), and the radius c of regulation metal sleeve (4) can change gold Belong to the magnitude of voltage between sleeve pipe (4) and grounded metallic shield layer (1), single cylinder single high voltage power cable is provided simultaneously Multiple voltage；Step 2) fills the metal sleeve (4) built in cylinder single high voltage power cable by low pressure in binding post and switch cubicle Connection is put, is powered as low-voltage alternating current power supply to low-voltage device；While high voltage power transmission demand is met, pass through the built-in gold Belong to low-voltage device power supply of the sleeve pipe (4) to the inside switch cabinet at both ends.
- 2. the method for increase high voltage power cable service voltage species according to claim 1, it is characterised in that：In step 1) in, the radius c of described metal sleeve (4) calculation formula is：<mrow> <mi>c</mi> <mo>=</mo> <msup> <mrow> <mo>(</mo> <mfrac> <mi>a</mi> <mi>b</mi> </mfrac> <mo>)</mo> </mrow> <mfrac> <msub> <mi>U</mi> <mn>2</mn> </msub> <msub> <mi>U</mi> <mi>max</mi> </msub> </mfrac> </msup> <mo>&CenterDot;</mo> <mi>b</mi> </mrow>In formula：U2：Magnitude of voltage between built-in sleeve pipe (4) and grounded metallic shield layer (1), calculation formula are as follows：<mrow> <msub> <mi>U</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mi>&tau;</mi> <mrow> <mn>2</mn> <mi>&pi;</mi> <mi>&epsiv;</mi> </mrow> </mfrac> <mi>l</mi> <mi>n</mi> <mfrac> <mi>b</mi> <mi>c</mi> </mfrac> </mrow>Umax：Maximum working voltage between conductor (3) and grounded metallic shield layer (1), calculation formula are as follows：<mrow> <msub> <mi>U</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>aE</mi> <mi>M</mi> </msub> <mi>l</mi> <mi>n</mi> <mfrac> <mi>b</mi> <mi>a</mi> </mfrac> </mrow>a：The radius of conductor (3)b：The radius of grounded metallic shield layer (1).
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| CN201711131094.6A CN107895609B (en) | 2017-11-15 | 2017-11-15 | A method of increasing high voltage power cable service voltage type |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375376A (en) * | 2015-09-01 | 2016-03-02 | 上海大华电器设备有限公司 | Combined substation electrical switch cabinet |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375376A (en) * | 2015-09-01 | 2016-03-02 | 上海大华电器设备有限公司 | Combined substation electrical switch cabinet |
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