| US 7,518,851 B2 | ||
| Distribution switchgear | ||
| Kenji Tsuchiya, Hitachi (Japan); Yoshinori Nishizawa, Hitachi (Japan); and Yuko Kajiyama, Hitachiota (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on Jul. 09, 2007, as Appl. No. 11/774,786. | ||
| Claims priority of application No. 2006-189159 (JP), filed on Jul. 10, 2006. | ||
| Prior Publication US 2008/0007896 A1, Jan. 10, 2008 | ||
| Int. Cl. H02B 1/20 (2006.01) | ||
| U.S. Cl. 361—611 [174/72 B; 361/623; 361/624; 361/639; 361/605; 361/606] | 24 Claims |
| 1. A distribution switchgear comprising;
an equipment room and a main busbar room, which are formed in a distribution panel housing on its front side and on its back
side respectively by partitioning;
equipment units disposed in the equipment room, each comprising a vacuum circuit breaker, a current transformer on a load
side of the circuit breaker and a zero-phase-sequence current transformer on a power supply side of the circuit breaker, the
equipment units being vertically arranged;
a solid-insulated main busbar being disposed along a horizontal direction of the housing in the main busbar room,
a solid-insulated link busbar being vertically disposed in the main busbar room to be connected with the main busbar and connected
with one side of each of the equipment units, and
a solid-insulated branch busbar connected with the other side of each of the equipment units,
wherein the vacuum circuit breaker comprises an electromagnetic operating device with an electromagnet, a permanent magnet
and a solid lubricating bearing used for a sliding part of the electromagnetic operating device.
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