Patent ID: 9728950
Date: 2017-08-08
CPC Classifications: H02G

Claim:
1. A cryogenic cable termination connector comprising: a lead-out conductor led out from a very low temperature site to a room temperature site via a liquid refrigerant layer, a refrigerant gas layer and an oil layer, the liquid refrigerant layer being positioned lower than the refrigerant gas layer and the refrigerant gas layer being positioned lower than the oil layer, wherein the lead-out conductor is provided with a capacitor-cone insulator including a cylinder portion, and a plurality of metal foils for dividing an electric field from a high voltage level down to a ground voltage level, the plurality of metal foils being stacked throughout the insulator, among electric field tilting portions of the capacitor-cone insulator in each of which voltage changes gradually from the high voltage level to the ground voltage level, the electric field tilting portion positioned lower than the cylinder portion is located in the liquid refrigerant layer and the electric field tilting portion positioned higher than the cylinder portion is located in the oil layer, the cylinder portion being at a ground voltage level in the outermost layer of the capacitor- cone insulator, the capacitor-cone insulator is applied circumferentially around a hollow pipe, the lead-out conductor penetrates from a room temperature part to a very low temperature part inside the hollow pipe, an upper part of the hollow pipe has a hermetic structure between the upper part of the hollow pipe and the lead-out conductor inside the hollow pipe, the lead-out conductor and the upper part of the hollow pipe are electrically connected to each other, and a lower part of the hollow pipe is not provided with the hermetic structure such that liquid refrigerant of the liquid refrigerant layer penetrates into a space between the lower part of the hollow pipe and the lead-out conductor.