| 摘要 |
PROBLEM TO BE SOLVED: To make the breadth of a switchboard constant by arranging apparatuses for three phases along inclined lines, setting horizontal pitches of adjacent apparatuses constant, and meanwhile increasing or decreasing their vertical pitches. SOLUTION: When vacuum interruptors 11 are used as apparatuses for three phases in a drawer type circuit breaker, the vacuum interruptors 11 are arranged along inclined lines 10 by making their horizontal pitches (a), and vertical pitches b1 and b2. Then a primary disconnecting unit and a secondary disconnecting unit are arranged on the left and right sides of a vacuum interruptor 11. Increase or decrease of insulation distances among three phases, i.e., pitches in the directions along the inclined lines 10 for keeping horizontal pitches constant, is performed by increasing or decreasing vertical pitches. Consequently, it is possible to make the breadths of a unit and a switchboard constant, and to use a part of components in common, since the vertical pitches are changed according to a rated current, an interrupt current, and the kinds of apparatuses, to keep the horizontal pitches of the apparatuses constant. |
