Pipe type solid insulation cable system, method of constructing pipe type solid insulation cable system and method of cooling pipe type solid insulation cable system

Patent metadata

Field	Value
Publication number	US-9928942-B2
Application number	US-201615294908-A
Country	US
Kind code	B2
Filing date	Oct 17, 2016
Priority date	Feb 5, 2016
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A pipe type solid insulation cable system includes a plurality of solid insulation cables; a plurality of steel pipes in which the plurality of solid insulation cables are inserted, respectively; and a refrigerant circulation path that includes a plurality of refrigerant pipes, which are provided to be adjacent to the plurality of steel pipes, respectively, circularly connected with each other to circulate a refrigerant therein, wherein the pipe type solid insulation cable system is configured to indirectly cool the plurality of solid insulation cables in the plurality of steel pipes, respectively, by cooling at least a part of a periphery of each of the plurality of steel pipes by the refrigerant circulation path without flowing the refrigerant in the plurality of steel pipes.

First claim

What is claimed is:

1. A pipe type solid insulation cable system comprising:
a plurality of solid insulation cables, the plurality of solid insulation cables including at least a first solid insulation cable and a second solid insulation cable;
a plurality of steel pipes in which the plurality of solid insulation cables are inserted, respectively, the plurality of steel pipes including at least a first steel pipe and a second steel pipe in which the first solid insulation cable and the second solid insulation cable are respectively inserted; and
a refrigerant circulation path that includes a plurality of refrigerant pipes, which are provided to be adjacent to the plurality of steel pipes, respectively, the plurality of refrigerant pipes including at least a first refrigerant pipe and a second refrigerant pipe respectively provided to be adjacent to the first steel pipe and the second steel pipe, the plurality of refrigerant pipes including the first refrigerant pipe and the second refrigerant pipe being circularly connected with each other to circulate a refrigerant therein,
wherein the pipe type solid insulation cable system is configured to indirectly cool the plurality of solid insulation cables in the plurality of steel pipes, respectively, by cooling at least a part of a periphery of each of the plurality of steel pipes by the refrigerant circulation path without flowing the refrigerant in the plurality of steel pipes.

2. The pipe type solid insulation cable system according to claim 1 , further comprising a control unit that controls to alternately change a direction of flow of the refrigerant in the refrigerant circulation path every predetermined period.

3. The pipe type solid insulation cable system according to claim 1 , further comprising:
a cable temperature measurement device that measures temperature of each of the plurality of solid insulation cables; and
a control unit that controls to alternately change a direction of flow of the refrigerant in the refrigerant circulation path when a difference between temperatures at different positions of each of the plurality of solid insulation cables in an axial direction measured by the cable temperature measurement device is greater than or equal to a predetermined value.

4. The pipe type solid insulation cable system according to claim 3 ,
wherein the cable temperature measurement device includes
a plurality of optical fibers that are provided along the plurality of solid insulation cables in the plurality of steel pipes, respectively, and

a temperature profile measurement unit that causes predetermined light to be injected into each of the optical fibers and measures temperature at a predetermined measurement position in an axial direction of the respective optical fiber by detecting Raman backscattering generated at the measurement position.

5. The pipe type solid insulation cable system according to claim 1 , further comprising:
a cable temperature measurement device that measures temperature of each of the plurality of solid insulation cables;
a pump that circulates the refrigerant in the refrigerant circulation path; and
a control unit that controls the pump to adjust a flow rate of the refrigerant based on temperature of each of the plurality of solid insulation cables measured by the cable temperature measurement device.

6. The pipe type solid insulation cable system according to claim 5 ,
wherein the cable temperature measurement device includes
a plurality of optical fibers that are provided along the plurality of solid insulation cables in the plurality of steel pipes, respectively, and

a temperature profile measurement unit that causes predetermined light to be injected into each of the optical fibers and measures temperature at a predetermined measurement position in an axial direction of the respective optical fiber by detecting Raman backscattering generated at the measurement position.

7. The pipe type solid insulation cable system according to claim 5 , further comprising a plurality of the pumps that are provided along a longitudinal direction of the refrigerant circulation path with a predetermined distance.

8. The pipe type solid insulation cable system according to claim 1 , further comprising:
a refrigerant storage tank connected to each of the plurality of refrigerant pipes, and temporarily stores the refrigerant while cooling the refrigerant;
a refrigerant temperature measurement unit that measures temperature of the refrigerant in the refrigerant storage tank;
a pump that circulates the refrigerant into the refrigerant circulation path via the refrigerant storage tank; and
a control unit that controls the pump to adjust a flow rate of the refrigerant based on the temperature in the refrigerant storage tank measured by the refrigerant temperature measurement unit.

9. The pipe type solid insulation cable system according to claim 8 , wherein the control unit controls the pump to increase the flow rate of the refrigerant when a difference between temperature of the refrigerant flowing out from the refrigerant storage tank and temperature of the refrigerant flowing into the refrigerant storage tank is greater than or equal to a predetermined value.

10. The pipe type solid insulation cable system according to claim 8 , further comprising a plurality of the pumps that are provided along a longitudinal direction of the refrigerant circulation path with a predetermined distance.

11. The pipe type solid insulation cable system according to claim 1 ,
wherein the pipe type solid insulation cable system is configured by diverting a previously provided oil filled cable system, including
a plurality of steel pipes for oil filled cable, in each of which insulating oil is filled and in which a plurality of oil filled cables are inserted, respectively, and
a plurality of oil circulation pipes, which are provided to be adjacent to the plurality of steel pipes for oil filled cable, respectively, independently circulating the insulating oil in the plurality of s steel pipes for oil filled cable, respectively,

wherein the plurality of steel pipes of the pipe type solid insulation cable system are configured by diverting the plurality of steel pipes for oil filled cable by removing the insulating oil and the plurality of oil filled cables from the plurality of steel pipes for oil filled cable, respectively,
wherein the plurality of refrigerant pipes are configured by diverting the plurality of oil circulation pipes by removing the insulating oil from the plurality of oil circulation pipes, and
wherein the refrigerant circulation path is configured by circularly connecting the plurality of refrigerant pipes, diverted from the plurality of oil circulation pipes, without passing through the plurality of steel pipes.

12. A method of cooling a pipe type solid insulation cable system, the pipe type solid insulation cable system including
a plurality of solid insulation cables, the plurality of solid insulation cables including at least a first solid insulation cable and a second solid insulation cable,
a plurality of steel pipes in which the plurality of solid insulation cables are inserted, respectively, the plurality of steel pipes including at least a first steel pipe and a second steel pipe in which the first solid insulation cable and the second solid insulation cable are respectively inserted,
a refrigerant circulation path that includes a plurality of refrigerant pipes, which are provided to be adjacent to the plurality of steel pipes, respectively, the plurality of refrigerant pipes including at least a first refrigerant pipe and a second refrigerant pipe respectively provided to be

Assignees

• Sumitomo Electric Industries

Inventors

• Mashio Shoji
• Ona Satoshi

Classifications

• G01K1/14

  Supports; Fastening devices; Arrangements for mounting thermometers in particular locations · CPC title

• H01B7/423 Primary

  using a cooling fluid · CPC title

• H02G9/06

  in underground tubes or conduits; Tubes or conduits therefor · CPC title

• G01K11/32

  using changes in transmittance, scattering or luminescence in optical fibres · CPC title

• G01K13/00

  Thermometers specially adapted for specific purposes · CPC title