US 12,288,656 B2
Vacuum interrupter
Naoya Aihara, Tokyo (JP); Taiki Donen, Tokyo (JP); Yasutomo Otake, Tokyo (JP); Katsuya Jinno, Tokyo (JP); Hiromi Koga, Tokyo (JP); and Shinichi Miki, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/014,173
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed May 31, 2021, PCT No. PCT/JP2021/020710
§ 371(c)(1), (2) Date Jan. 3, 2023,
PCT Pub. No. WO2022/030086, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 2020-132939 (JP), filed on Aug. 5, 2020.
Prior Publication US 2023/0260725 A1, Aug. 17, 2023
Int. Cl. H01H 33/662 (2006.01); H01H 33/664 (2006.01); H01H 33/666 (2006.01)
CPC H01H 33/662 (2013.01) [H01H 33/664 (2013.01); H01H 33/666 (2013.01); H01H 2033/66269 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A vacuum interrupter comprising:
a cylindrical insulation container;
a movable-side end plate to close one end portion of the insulation container;
a fixed-side end plate to close another end portion of the insulation container;
a movable-side electrode provided at a distal end portion of a movable-side electrode rod disposed to penetrate the movable-side end plate;
a fixed-side electrode provided at a distal end portion of a fixed-side electrode rod disposed to penetrate the fixed-side end plate so as to face the movable-side electrode; and
an arc shield disposed so as to surround the movable-side electrode and the fixed-side electrode,
wherein a linear resistive layer and a nonlinear resistive layer are disposed so as to cover at least a part of a periphery of the insulation container, and
a magnitude relationship of each resistivity is R1>R3>R2, where R1 is a resistivity of the nonlinear resistive layer when an applied electric field is less than an operating electric field R2 is a resistivity of the nonlinear resistive layer when a lightning impulse is applied R2 is less than an impedance of a vacuum valve when the lightning impulse is applied, and R3 is a resistivity of the linear resistive layer.