1. A composition for use in making polymeric fiber membranes, the composition comprising a spin dope including:
a) a mixture of tetrabromo bis-phenol A polycarbonate (TBBA-PC) and tetrabromo bishydroxyphenylfluorene polycarbonate (TBBHPF-PC), in proportions, by weight, ranging (in percent) from about 6040 to 4060, and
b) n-methyl pyrrolidinone (NMP) and triethylene glycol (TEG), wherein a ratio of NMP to TEG, by weight, is in a range of about 1.6-2.5.
2. The composition of claim 1, wherein the TBBA-PC and TBBHPF-PC are provided in substantially equal amounts, by weight.
3. The composition of claim 1, wherein the ratio of NMP to TEG is about 2.
4. The composition of claim 2, wherein the ratio of NMP to TEG is about 2.
5. The composition of claim 1, wherein the spin dope comprises, by weight, 22.5% TBBA-PC, 22.5% TBBHPF-PC, 18.6% TEG, and 36.4% NMP.
6. A method of making polymeric fiber membranes for use in non-cryogenic gas separation, the method comprising the steps of:
a) combining tetrabromo bis-phenol A polycarbonate (TBBA-PC) and tetrabromo bishydroxyphenylfluorene polycarbonate (TBBHPF-PC), in proportions, by weight, ranging (in percent) from about 6040 to 4060, to form a mixture,
b) adding the mixture of step (a) to a mixture of n-methyl pyrrolidinone (NMP) and triethylene glycol (TEG), wherein a ratio of NMP to TEG, by weight, is in a range of about 1.6-2.5, so as to form a spin dope, and
c) forming the spin dope into hollow fibers.
7. The method of claim 6, further comprising passing gas through said fibers so as to separate the gas into components.
8. The method of claim 6, further comprising providing the TBBA-PC and TBBHPF-PC in substantially equal amounts, by weight.
9. The method of claim 6, further comprising providing the NMP and TEG in a ratio which is about 2.
10. The method of claim 8, further comprising providing the NMP and TEG in a ratio which is about 2.
11. The method of claim 6, further comprising coating the fibers with an aqueous solution of a non-ionic surfactant.
12. The method of claim 11, further comprising selecting the non-ionic surfactant to be in a concentration of about 5-150 ppm.
13. The method of claim 6, wherein step (c) is performed at a temperature in a range of about 50-85\xb0 C.
14. The method of claim 11, wherein step (c) is performed at a temperature in a range of about 50-85\xb0 C.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system for performing a continuity test on a lightning conduction system of a wind turbine, the system comprising:
a testing device including a blade ring and an electrically conductive member attached to the blade ring, the blade ring being configured to be positioned around at least a portion of an outer perimeter of a rotor blade of the wind turbine;
a carriage attached to the testing device; and,
a cable having a first end and a second end attached to the carriage and extending between a first anchor point and a second anchor point, the first and second anchor points being spaced apart from one another such that a lightning receptor of the lightning conduction system is generally disposed between the first and second anchor points,
wherein the cable is coupled between the first and second anchor points such that, as the cable is displaced, the testing device is moved to a position at which the electrically conductive member contacts the lightning receptor.
2. The system of claim 1, wherein the testing device comprises a support member, the support member having a first end attached to the carriage and a second end attached to the blade ring.
3. The system of claim 2, wherein the blade ring is pivotally attached to the second end of the support member.
4. The system of claim 3, wherein a tensioning device is coupled between the blade ring and the support member.
5. The system of claim 1, wherein the blade ring defines a closed shape configured to be positioned around an entire outer perimeter of the rotor blade.
6. The system of claim 5, wherein at least one of a height and a width of the blade ring is configured such that an inner surface of the blade ring engages an outer perimeter of the rotor blade when the electrically conductive member is vertically aligned with the lightning receptor.
7. The system of claim 1, wherein the electrically conductive member comprises a metal wire brush attached to an inner surface of the blade ring.
8. The system of claim 1, further comprising a wire having a first end attached to the electrically conductive member and a second end disposed generally adjacent to a support surface of the wind turbine.
9. The system of claim 8, further comprising an electrical measurement device coupled between the second end of the wire and a component of the lightning conduction system, the electrical measurement device being configured to measure an electrical property of the lightning conduction system.
10. The system of claim 1, wherein the first anchor point is disposed on a nacelle of the wind turbine and the second anchor point is disposed generally adjacent to a support surface of the wind turbine.
11. The system of claim 1, wherein a first pulley is attached to the wind turbine at the first anchor point and a second pulley is attached to a pulley anchor at the second anchor point, the cable being coupled between the first and second pulleys such that, as the cable is displaced, the testing device is moved to a position at which the electrically conductive member contacts the lightning receptor.
12. The system of claim 1, further comprising a secondary cable coupled to the carriage through a cable guide, the secondary cable extending from generally adjacent the first anchor point to generally adjacent the second anchor point.
13. A method for performing a continuity test on a lightning conduction system of a wind turbine, the method comprising:
coupling a cable between a first anchor point and a second anchor point, the first anchor point being spaced apart from the second anchor point such that a lightning receptor of the lightning conduction system is generally disposed between the first and second anchor points;
coupling the cable to a testing device; and,
displacing the cable so that the testing device is moved to a position between the first and second anchor points at which an electrically conductive member of the testing device contacts the lightning receptor.
14. The method of claim 13, further comprising connecting a wire to the electrically conductive member such that an electrical connection is formed between the wire and the lightning conduction system when the electrically conductive member contacts the lightning receptor.
15. The method of claim 14, further comprising measuring an electrical property between the wire and a component of the lightning conduction system.
16. The method of claim 14, wherein the wire generally extends between the electrically conductive member and a support surface of the wind turbine.
17. The method of claim 13, further comprising adjusting a position of at least one of the first anchor point and the second anchor point such that, as the cable is displaced, the testing device is moved to a position at which the electrically conductive member contacts the lightning receptor.
18. The method of claim 13, further comprising aligning a tip of a rotor blade of the wind turbine within a blade ring of the testing device such that, as the cable is displaced, the testing device is moved to a position at which the electrically conductive member contacts the lightning receptor.
19. The method of claim 18, wherein at least one of a height and a width of the blade ring is configured such that an inner surface of the blade ring engages an outer perimeter of the rotor blade when the electrically conductive member is vertically aligned with the lightning receptor.
20. A testing device for performing a continuity test on a lightning conduction system of a wind turbine, comprising:
a support member;
a blade ring attached to the support member, the blade ring being configured to be positioned around at least a portion of an outer perimeter of a rotor blade of the wind turbine; and,
an electrically conductive member attached to an inner surface of the blade ring,
wherein the electrically conductive member is configured to contact a lightning receptor of the lightning conduction system when the blade ring is positioned around the at least a portion of the outer perimeter of the rotor blade.