Hitachi, Ltd.

Hitachi Electric Systems Co., Ltd.

Hideki Masuhara

Akira Nishimizu

Youichi Amako

Masanao Kuwabara

Tomomi Izuna

Kunio Katada

Uichi Kudo

Youzou Sibata

Hiromasa Ozaki

Yasuhiro Kawamura

An object of the present invention is to provide a switching device for power distribution, wherein the entire load side-area including a circuit breaker can be protected against the grounding, whereby the protection region can be widened, leading to an enhancement in reliability. A circuit breaker, a current transformer and a zero-phase current transformer disposed in series are constructed as a unit, mounted on a carriage and accommodated in a power-receiving/distributing board. The switching unit for power distribution is constructed for connection to and for disconnection from a power source side-conductor and a load side-conductor. The zero-phase current transformer is disposed at a power source side-portion of the circuit breaker.

Switching device for power distribution

In order to spread a transformer having energy saving and environmental effects widely and quickly, a method for supporting received orders of a transformer is provided. In the method, a first response including a customer's desired inquiry relating to an installation date of a measuring circuit is issued from a sales department to a customer who accessed a web site of the sales department. A second response including the installation date of the measuring circuit is issued from a measurement department in charge of measurement of the transformer. Since cooperative communication is achieved between the sales department and the measurement department in charge of the transformer measurement, the system can quickly cope with the customer who accessed the web site of the sales department and a social demand of early realization of energy saving and COreduction can be realized with highly excellent effects.

Method for supporting the orders received of transformer

To provide a technology capable of restraining direct current magnetic deviation in a transformer without providing a gap in a core, an axis of easy magnetization is provided in a second direction intersecting with a first direction along a magnetic circuit of the core to thereby bring a B-H characteristic of a material characteristic of the core into an unsaturated state.

Method of fabricating a core for a transformer

Transformer

A split structure type transformer has a core upper and lower split-up secondary windings and a primary winding which are wound about the core, a single tap winding having a plurality of tap winding parts and a plurality of tap terminals, and a single tap selector. The secondary windings are respectively connectable to independent loads, with only one end of the tap winding being connected to the primary winding, and the tap terminals are respectively connected to terminals of the tap selector. A pair of tap winding parts, connected to the same terminal of the tap selector, are arranged adjacently along the axial direction of winding. Each of the tap winding part pairs may be replaced by a single tap winding part which is formed by winding a single strand having a cross-sectional area which is twice a cross-sectional area of a strand used for winding each tap winding part pair.

Split structure type transformer

Growing community of inventors

Hitachinaka, Japan

Hideki Masuhara