Processing

Please wait...

Settings

Settings

Goto Application

1. WO2011026519 - HOLLOW ELECTRIC INSULATOR AND MANUFACTURING THEREOF

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

AMENDED CLAIMS

received by the International Bureau on 07 July 2010

1. A method for manufacturing a tubular high-voltage and/or medium voltage insulator body (la, lb) , comprising the following steps:

a) Providing a winding device comprising a rotatable winding mandrel (5) and winding guide for guiding an elongated winding member from a winding supply device to the winding guide in a winding direction tangentially towards the winding mandrel, wherein the winding mandrel defines a longitudinal axis (7) and extends longitudinally between a first end portion (13) and a second end portion (14), wherein said winding direction is inclined to the longitudinal axis such that the longitudinal axis and said winding direction enclose a winding angle;

b) Forming a first layer portion (11) of the insulator body by winding a first winding member (2) in a coiled manner with respect to the longitudinal axis (7)ยท with a first winding angle, wherein the first winding member (2) has a tensile strength in the winding direction which exceeds a tensile strength of the first winding member transversely to the winding direction;

c) Forming a second layer portion (12) of the insulator body by winding the first winding member (2) in a coiled manner with respect to the longitudinal axis with a second winding angle, wherein an absolute value of the second winding angle differs from an absolute value of the first winding angle, wherein the radially innermost first layer portion (11) of the insulator body is at least proximate to the end portions wound with a minimal winding angle for providing the insulator body with an axial tensile strength proximate to the end portions such that the insulator body sustains a pressure shock wave in its hollow of at least 20 bar in an operat- ing state, and

wherein a radially outermost second layer portion (12) of the insulator body is in between said end portions wound with a maximal winding angle for providing the insulator body with a hoop strength longitudinally in between said end portions such that the insulator body sustains a pressure shock wave in its hollow of at least 20 bar in an operating state;

d) Fixing the first winding member (2) with a compound in a curing process.

2. The method according to claim 1, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle is varied during the winding process from a radially inner layer to a radially outer layer of the insulator body.

3. The method according to claim 1 or 2, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle is varied between the first end portion and the second end portion in the direction of the longitudinal axis during the winding process of the first layer portion and the second layer portion, respectively.

4. The method according to any one of claims 1 to 3, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle is varied monotonously increasingly or monotonously decreasingly, in particular in a stepwise or continuous fashion, during the winding process from a radially inner layer to a radially outer layer and/or within one layer of the insulator body.

5. The method according to any one of claims 1 to 3, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle is varied monotonously increasingly or monotonously decreasingly, in particular in a step- wise or continuous fashion, during the winding process from a radially inner layer to a radially outer layer and/or within one layer of the insulator body at every layer having an odd layer number.

The method according to any one of claims 1 to 3, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle is varied monotonously increasingly or monotonously decreasingly, in particular in a stepwise or continuous fashion, during the winding process from a radially inner layer to a radially outer layer and/or within one layer of the insulator body at every layer having an even layer number.

The method according to any one of claims 4 to 6, wherein the at least one of the absolute value of the first winding angle and the absolute value of the second winding angle of a radially inner layer of the insulator body is smaller than the absolute value of the first winding angle and the absolute value of the second winding angle of a radially outer layer of the insulator body.

The method according to any one of claims 1 to 7, characterized setting the at least one of the first and second winding angle to be in a range of about 2 degrees to about 90 degrees, in particular in a range of about 5 to about 70 degrees, more particular in a range of about 9 degrees to about 50 degrees.

The method according to any one of claims 1 to 8, characterized in that the first winding member is a band or roving of plural strands of fibers, preferably continuous strands of fibers, and wherein at least one layer is wound such that two consecutive convolutions of the band are arranged at least partially in an overlapping manner with respect to the longitudinal axis .

10. The method according to any one of claims 1 to 9, wherein one of the first winding angle and the second winding angle is a positive winding angle and wherein one of the second winding angle and the first winding angle is a negative winding angle with respect to the longitudinal axis.

11. The method according to any one of claims 1 to 10, wherein prior to the step of forming the first layer portion at least one base layer portion of the insulator body is formed by winding a second winding member in a coiled manner with respect to the longitudinal axis with a third winding angle on the mandrel.

12. The method according to claim 11, wherein the second winding member is a strip-shaped tissue, in particular a tissue comprising at least one of a fabric or a fleece, in particular a polyester fabric or fleece.

13. The method according to claim 11 or 12, wherein a convolution of the second winding member is wound such that it contacts a neighboring convolution of the second winding member of the same layer in an overlapping manner .

14. The method according to any one of claims 11 to 13, wherein the third winding angle is a positive winding angle with respect to the longitudinal axis.

15. The method according to any one of claims 1 to 14, characterized by wetting at least one of the first winding member and the second winding member with a compound prior to the step of forming the first layer, the second layer and the base layer, respectively, in particular by drawing the first winding member through a liquid polymeric bath.

16. The method according to any one of claims 1 to 15, wherein at least one local enforcement element is embedded between the layers, particularly in at least one of the first end portion and the second end portion of the insulator body, the local enforcement element being in particular a fabric, in particular a fabric having a predefined mechanical tensional strength in at least direction for structurally conferring or improving at least one stress withstand capability to/of the insulator body, more particularly the local enforcement element .comprising at least one pre-preg.

17. The method according to any one of claims 1 to 16, wherein at least one tailored insulator section is derived by cutting a longitudinal section (19, 21) out of the cured insulator body along a cutting line (20, 22) .

18. A hollow medium voltage or high voltage (fiber reinforced polymer) composite insulator body (la, lb) comprising a plurality of layer portions of a first winding member (2) wound in helical convolutions in a direction of a longitudinal axis (7) defined by the insulator body, wherein a convoluting direction of the helical convolutions is tangentially with respect to the longitudinal axis and extends between a first end portion and a second end portion of the insulator body, wherein said convoluting direction is inclined to the longitudinal axis such that the longitudinal axis and said convoluting direction enclose a winding angle;

the first winding member having a tensile strength in the winding direction which exceeds a tensile strength of the winding member transversely to the winding direction;

the plurality of layer portions comprising a first layer portion being wound with a first winding angle and a second layer portion being wound with a second winding angle wherein an absolute value of the second winding angle differs from an absolute value of the first winding angle,

wherein the radially innermost first layer portion (11) of the insulator body is at least proximate to the end portions being wound with a minimal winding angle for providing the insulator body with an axial tensile strength proximate to the end portions such that the insulator body sustains a pressure shock wave in its hollow of at least 20 bar in an operating state, and

wherein a radially outermost second layer portion (12) of the insulator body is at least in between said end portions being wound with a maximal winding angle for providing the insulator body with a hoop strength longitudinally in between said end portions such that the insulator body sustains a pressure shock wave in its hollow of at least 20 bar in an operating state;

and wherein the first winding member is fixed with a compound.

The insulator body according to claim 18, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle of a radially inner layer is different from at least one of the absolute value of the first winding angle of a radially outer layer of the insulator body.

The insulator body according to claim 18 or 19, wherein the first layer portion and the second layer portion belongs to the same layer such that a pitch distance of two neighboring convolutions of the same layer is different.

21. The insulator body according to claim 20, wherein the first layer portion is located at the first end portion and the second end portion of the insulator body and wherein the second layer portion is located in between the first end portion and the second end portion of the insulator body.

The insulator body according to claim 20 or 21, wherein the winding angle varies, in particular varies steadily, in between the first layer portion and the second layer portion.

The insulator body according to any one of claims 18 to 22, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle varies monotonously increasingly or monotonously decreasingly, in particular in a stepwise or continuous fashion, in between a radially inner layer to a radially outer layer and/or within one layer of the insulator body.

The insulator body according to any one of claims 18 to 22, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle varies monotonously increasingly or monotonously decreasingly, ' in particular in a stepwise or continuous fashion, in between a radially inner layer to a radially outer layer and/or within one layer of the insulator body at every layer having an odd layer number.

The insulator body according to any one of claims 18 to 22, wherein at least one of the absolute value of the first winding angle and the absolute value of the second winding angle varies monotonously increasingly or monotonously decreasingly, in particular in a stepwise or continuous fashion, from a radially inner layer to a radially outer layer and/or within one layer of the insulator body at every layer having an even layer number.

The insulator body according to any one of claims 23 to 25, wherein the at least one of the absolute value of the first winding angle and the absolute value of the second winding angle of a radially inner layer of the insulator body is smaller than the absolute value of the first winding angle and the absolute value of the second winding angle of a radially outer layer of the insulator body.

The insulator body according to any one of claims 18 to 26, wherein the at least one of the first and second winding angle is in a range of about 2 degrees to about 90 degrees, in particular in a range of about 5 to about 70 degrees, more particular in a range of about 9 degrees to about 50 degrees.

The insulator body according to any one of claims 18 to 27, characterized in that the first winding member is a band or roving of plural strands of fibers, preferably continuous strands of fibers, and wherein at least one layer is wound such that two consecutive convolutions of the band are arranged at least partially in an overlapping manner with respect to the longitudinal axis.

The insulator body according to any one of claims 18 to 28, wherein one of the first winding angle and the second winding angle is a positive winding angle and wherein one of the second winding angle and the first winding angle is a negative winding angle with respect to the longitudinal axis.

The insulator body according to any one of claims 18 to 29, wherein at least one base layer portion of the insulator body is arranged under the first layer portion, and wherein said at least one base layer portion comprises a second winding member being wound in a coiled manner with respect to the longitudinal axis with a third winding angle.

The insulator body according to claim 30, wherein the second winding member is a strip-shaped tissue, in particular a tissue comprising at least one of a fabric or a fleece, in particular a polyester fabric or fleece.

32. The insulator body according to claim 30 or 31, wherein two neighboring convolutions of the second winding member of the same layer contact one another in an overlapping manner.

33. The insulator body according to any one of claims 30 to 32, wherein the third winding angle is a positive winding angle with respect to the longitudinal axis.