Cable connecting structure, member for cable connecting structure, and method of manufacturing cable connecting structure

A cable connecting structure comprising:

• a first three-phase power cable pair, a second three-phase power cable pair, and a third three-phase power cable pair, respectively including a pair of power cables that are mutually connected;
• three insulating rubber connecting tubes covering connecting sections of the first, second, and third three-phase power cable pairs, respectively;
• a steel pipe accommodating portions of each of the first, second, and third three-phase power cable pairs, and the three rubber connecting tubes;
• and
• a heat dissipation material provided between the steel pipe and each of the three rubber connecting tubes, and making contact with the steel pipe and each of the three rubber connecting tubes,
• wherein the heat dissipation material includes a heat dissipating metal that has a melting point lower than a melting point of the steel pipe, and
• wherein the heat dissipation material on a side of the steel pipe has a resistance lower than a resistance of the heat dissipation material on a side of each of the three rubber connecting tubes.

A cable connecting structure comprising:

• a first three-phase power cable pair, a second three-phase power cable pair, and a third three-phase power cable pair, respectively including a pair of power cables that are mutually connected;
• three insulating rubber connecting tubes covering connecting sections of the first, second, and third three-phase power cable pairs, respectively;
• a steel pipe accommodating portions of each of the first, second, and third three-phase tower cable pairs, and the three rubber connecting tubes;
• a heat dissipation material provided between the steel pipe and each of the three rubber connecting tubes, and making contact with the steel pipe and each of the three rubber connecting tubes;
• and
• a return cable installed together with the first, second, and third three-phase power cable pairs, and grounded together with the steel pipe and the shielding layer of each of the first, second, and third three-phase power cable pairs,
• wherein the heat dissipation material includes a heat dissipating metal that has a melting point lower than a melting point of the steel pipe,
• wherein each power cable of the first, second, and third three-phase power cable pairs includes, from a center toward an outer periphery thereof, a conductor, an insulating layer, and a shielding layer, and
• wherein the shielding layer of each of the first, second, and third three-phase power cable pairs are grounded altogether with the steel pipe.

A cable connecting structure comprising:

• a first three-phase power cable pair, a second three-phase power cable pair, and a third three-phase power cable pair, respectively including a pair of power cables that are mutually connected;
• three insulating rubber connecting tubes covering connecting sections of the first, second, and third three-phase power cable pairs, respectively;
• a steel pipe accommodating portions of each of the first, second, and third three-phase power cable pairs, and the three rubber connecting tubes;
• a heat dissipation material provided between the steel pipe and each of the three rubber connecting tubes, and making contact with the steel pipe and each of the three rubber connecting tubes;
• and
• a spacer configured to adjust positions of the three rubber connecting tubes inside the steel pipe,
• wherein the heat dissipation material includes a heat dissipating metal that has a melting point lower than a melting point of the steel pipe, and
• wherein the spacer includes
• a core section, inserted between the three rubber connecting tubes, and configured to restrict movements of the first, second, and third three-phase power cable pairs toward a center axis of the steel pipe, and
• a support section configured to support the core section, while making contact with an inner peripheral portion of the steel pipe, so that a position of the core section inside the steel pipe is adjustable.

A member for a cable connecting structure, comprising:

• three insulating rubber connecting tubes covering connecting sections of a first three-phase power cable pair, a second three-phase power cable pair, and a third three-phase power cable pair respectively including a pair of power cables that are mutually connected, respectively;
• a steel pipe accommodating portions of each of the first, second, and third three-phase power cable pairs, and the three rubber connecting tubes;
• and
• a heat dissipation material provided between the steel pipe and each of the three rubber connecting tubes, and making contact with the steel pipe and each of the three rubber connecting tubes,
• wherein the heat dissipation material includes a heat dissipating metal that has a melting point lower than a melting point of the steel pipe, and
• wherein the heat dissipation material on a side of the steel pipe has a porosity or resistance lower than that of the heat dissipation material on a side of each of the three rubber connecting tubes.

A method of manufacturing a cable connecting structure, comprising:

• forming a first three-phase power cable pair, a second three-phase power cable pair, and a third three-phase power cable pair respectively including a pair of power cables that are mutually connected;
• covering connecting sections of the first, second, and third three-phase power cable pairs by three insulating rubber connecting tubes, respectively;
• and
• accommodating portions of each of the first, second, and third three-phase power cable pairs, and the three rubber connecting tubes, inside a steel pipe, and arranging a heat dissipation material between the steel pipe and each of the three rubber connecting tubes to making contact with the steel pipe and each of the three rubber connecting tubes,
• wherein the heat dissipation material includes a heat dissipating metal that has a melting point lower than a melting point of the steel pipe, and
• wherein the heat dissipation material on a side of the steel pipe has a porosity lower than a porosity of the heat dissipation material on a side of each of the three rubber connecting tubes.