Abstract

Apparatus for a transmission line, comprises conductors each being separated from one or more other of the conductors by a dielectric material, and electrical connections for the conductors to a supply side of a power source and/or a return side of the power source. The apparatus can be switched between at least first and second modes. In the first mode, one or more of the conductors are connected to the supply side of the power source but not to the return side of the power source, and one or more of the conductors are connected to the return side of the power source but not to the supply side of the power source. In the second mode any one, more than one or all of: (i) a different one or more of the conductors is connected to the supply side of the power source but not to the return side of the power source compared with the first mode; (ii) a different one or more of the conductors is connected to the return side of the power source but not to the supply side of the power source compared with the first mode; (iii) one or more of the conductors that is connected in the first mode to the supply side of the power source but not to the return side of the power source, or to the return side of the power source but not to the supply side of the power source, is isolated; and (iv) one or more of the conductors is connected to the supply side and to the return side.

IPC Classes  ?

• H02J 50/12 - Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
• B60L 53/12 - Inductive energy transfer
• H01B 9/00 - Power cables
• H01F 38/14 - Inductive couplings
• H01P 3/00 - WaveguidesTransmission lines of the waveguide type
• H01P 5/00 - Coupling devices of the waveguide type

Abstract

An electrical T-junction box is provided for taking a spur off an electrical transmission- and-return line arrangement. The junction box has a cable entry/exit port for each of a transmission line, a return line, and a spur, and an electrically conducting connector that can electrically connect the two conductors in a capacitive transmission/return line. Each connector has fastening means for each conductor in each line. The connector has an electrical joint which is electrically connected to the spur, so forming a T-junction, and the spur can be connected as a capacitive spur.

IPC Classes  ?

• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H01B 9/00 - Power cables
• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks
• H01B 7/30 - Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying AC, e.g. due to skin effect
• H01R 9/24 - Terminal blocks
• H02G 3/08 - Distribution boxesConnection or junction boxes
• H02G 3/16 - Distribution boxesConnection or junction boxes structurally associated with support for line-connecting terminals within the box

Abstract

A connection-and-protection device having two capacitively connected conductors respectively connected in use to a supply cable at one end and a load cable at the other end is provided, the connection and protection device including a connection terminal for connection to either of the supply or load cables, a pair of cable terminals for the respective capacitively connected conductors, a direct connection within the device between the connection terminal and one of the pair of cable terminals, the other of the pair cable terminals not normally being connected to the connection terminal and means for connecting the other of the pair of cable terminals to the connection terminal to protect the capacitive connection of the two conductors, if the voltage between the pair of cable terminals exceeds a threshold and event detection means comprising means for detection the voltage between the pair of cable terminals exceeding a threshold.

IPC Classes  ?

• H02H 7/22 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systemsEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for switching devices
• G01R 19/165 - Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
• H02H 7/16 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors

Abstract

A capacitive cable comprises: (a) a first plurality of conductors for connection to a power source, (b) a second plurality of conductors for connection to a load, and (c) a dielectric material between the first plurality of conductors and the second plurality of conductors, wherein each conductor is individually insulated, and wherein at least one of the conductors of the first plurality of conductors and at least one of the conductors of the second plurality of conductors are woven or wound into one or more bundles such that each individual conductor repeatedly transitions, along a length of the one or more bundles, between an outside of the one or more bundles and an inside of the one or more bundles. The capacitive cable can be used as both a transmission line and a return line.

IPC Classes  ?

• H01B 7/30 - Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying AC, e.g. due to skin effect

Abstract

A capacitive cable comprised six long, thin and narrow electrode plates or strips 101, 102, 103, 104, 105, 106. Typically they are 5 km long, 10 cm wide and 0.5 mm thick of aluminium or copper foil. Individual ones of them are separated by 0.25 mm thick polypropylene ribbons 107 insulating the individual strips from each other in an insulating manner. The assembly of strips and ribbons is contained within an insulating sheath 108. A capacitive cable comprised six long, thin and narrow electrode plates or strips 101, 102, 103, 104, 105, 106. Typically they are 5 km long, 10 cm wide and 0.5 mm thick of aluminium or copper foil. Individual ones of them are separated by 0.25 mm thick polypropylene ribbons 107 insulating the individual strips from each other in an insulating manner. The assembly of strips and ribbons is contained within an insulating sheath 108. At opposite ends 111,112, the alternate strips are cut off short and the remaining fingers 114,115 are joined together and to connection wires 116,117, typically by riveting 118. The wires are insulated and the insulating sheath extends onto the insulation of the wires, whereby the entire cable is insulated for safe contact with foreign objects between the ends.

IPC Classes  ?

• H01G 4/012 - Form of non-self-supporting electrodes
• H01B 7/08 - Flat or ribbon cables
• H01G 4/26 - Folded capacitors

Abstract

A connection-and-protection device having two capacitively connected conductors respectively connected in use to a supply cable at one end and a load cable at the other end is provided, the connection and protection device including a connection terminal for connection to either of the supply or load cables, a pair of cable terminals for the respective capacitively connected conductors, a direct connection within the device between the connection terminal and one of the pair of cable terminals, the other of the pair cable terminals not normally being connected to the connection terminal and means for connecting the other of the pair of cable terminals to the connection terminal to protect the capacitive connection of the two conductors, if the voltage between the pair of cable terminals exceeds a threshold and event detection means comprising means for detection the voltage between the pair of cable terminals exceeding a threshold.

IPC Classes  ?

• H02H 7/22 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systemsEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for switching devices
• G01R 19/165 - Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
• H02H 7/16 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors

Abstract

A capacitive power transmission cable, having at least two sets of conductive strands, the sets of strands being insulated from each other and in capacitive relationship, the one with the other: wherein the conductive strands are laid at least substantially in a multiples of six layer structure, with substantially equal numbers of strands of both sets; each layer has strands of one set alternating with strands of the other set; and the strands of the respective sets have different contrasting color.

IPC Classes  ?

• H01B 9/04 - Concentric cables
• H01B 3/08 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartzInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glassInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glass woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances slag woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances vitreous enamels
• H01B 9/00 - Power cables

Abstract

A connection-and-protection device (108) for a power-transmission cable (104) having two capacitively connected conductors (105, 106) respectively connected in use to a supply cable (109) at one end and a load cable (110) at the other end is provided, the connection-and- protection device comprising: • a connection terminal (4) for connection to either of the supply or load cables, • a pair of cable terminals (5, 6) for the respective capacitively connected conductors (105, 106), • a direct connection (8) within the device between the connection terminal (4) and one of the pair of cable terminals (5), the other of the pair cable terminals (6) not normally being connected to the connection terminal (4) and • means (2) for connecting the other of the pair of cable terminals to the connection terminal to protect the capacitive connection of the two conductors, in the event that the voltage between the pair of cable terminals exceeds a threshold and • event detection means comprising means for detection the voltage between the pair of cable terminals (22) exceeding a threshold.

IPC Classes  ?

• H02H 7/22 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systemsEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for switching devices
• H01B 7/30 - Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying AC, e.g. due to skin effect
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H01B 7/00 - Insulated conductors or cables characterised by their form
• H02H 9/04 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
• H02H 7/16 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors

Abstract

A capacitive cable comprised six long, thin and narrow electrode plates or strips (101, 102, 103, 104, 105, 106). Typically, they are 5 km long, 10 cm wide and 0.5 mm thick of aluminum or copper foil. Individual ones of them are separated by 0.25 mm thick polypropylene ribbons (107) insulating the individual strips from each other in an insulating manner. The assembly of strips and ribbons is contained within an insulating sheath 108. At opposite ends (111,112), the alternate strips are cut off short and the remaining fingers (114,115) are joined together and to connection wires (116,117), typically by riveting (118). The wires are insulated and the insulating sheath extends onto the insulation of the wires, whereby the entire cable is insulated for safe contact with foreign objects between the ends.

IPC Classes  ?

• H01G 4/012 - Form of non-self-supporting electrodes
• H01B 7/08 - Flat or ribbon cables
• H01G 4/26 - Folded capacitors

Abstract

A capacitive power transmission cable (1) having at least two sets of conductive strands (2) and the strands of the sets are distributed in a transverse cross-section of the cable, whereby the two sets are in capacitive relation to each other, wherein preferably, the capacitance is at least 10 nF/m.

IPC Classes  ?

• H01B 7/00 - Insulated conductors or cables characterised by their form
• H01B 7/30 - Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying AC, e.g. due to skin effect
• H02J 3/22 - Arrangements for adjusting, eliminating or compensating reactive power in networks in cables
• H01B 9/00 - Power cables

Abstract

A capacitive power transmission cable, comprising: • at least two sets of conductive strands, the sets of strands being insulated from each other and in capacitive relationship, the one with the other; wherein: • the conductive strands are laid at least substantially in a multiples of six layer structure, with substantially equal numbers of strands of both sets • each layer has strands of one set alternating with strands of the other set and • the strands of the respective sets have different contrasting colour.

IPC Classes  ?

• H01B 7/30 - Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying AC, e.g. due to skin effect
• H02J 3/22 - Arrangements for adjusting, eliminating or compensating reactive power in networks in cables
• H01B 9/00 - Power cables
• H01B 9/04 - Concentric cables

Abstract

A capacitive cable (1) comprises five layers (2,3,4,5,6), of two set of copper strands (8,9), which alternate from one layer to the next layer. The layers are laid around an inner of polyester (10), having a diameter such that twelve, bare copper strands (8) of layer (2) are able to be wound around it tightly abutting each other. The strands of the two layers are at opposite helical angles α to each other. Typically the strands be of 13AWG - 1.82mmOD. Around the strands of this layer are wound insulating tape of polyester or PET for interlayer insulation (11). This is provided to be 0.2mm thick. Next eighteen strands of tinned copper strands (9) of the same gauge are wound as layer (3), with another 0.2mm insulating layer of the same type. The strands of the two layers (2,3) are at opposite helical angles α to each other. The successive layers (4-6) each have six more strands more strands than the last, with their material alternating plain, tinned, plain. The same insulation is provided between each pair of layers.

IPC Classes  ?

• H01B 7/30 - Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying AC, e.g. due to skin effect
• H01B 9/00 - Power cables
• H02J 3/22 - Arrangements for adjusting, eliminating or compensating reactive power in networks in cables
• H01B 9/04 - Concentric cables