Disconnecting switch with earthing switch
Operating shaft 4 allows disconnecting switch-side and earthing switch-side moving contacts 7 a and 7 b to linearly reciprocate with the rotation of operating shaft 4 . Operating shaft 4 has two-hole lever 5 allow an arc motion. Each one end of two curved links 6 a and 6 b is connected to two-hole lever 5 and the other end of two curved links 6 a and 6 b is respectively connected to the disconnecting switch-side moving contact or the earthing switch-side moving contact. When the two connecting points are axisymmetric with respect to the bisector, both the disconnecting switch and the earthing switch are in an open state; when two-hole lever 5 moves at a predetermined angle to the disconnecting switch-side, the disconnecting switch is in a closed state; and when two-hole lever 5 moves at a predetermined angle to the earthing switch-side, the earthing switch is in a closed state.
1. A disconnecting switch with earthing switch comprising:
a sealed tank;
two main circuit conductors disposed in the sealed tank so that extended axes thereof intersect with each other;
a disconnecting switch being disposed on one main circuit conductor side, the disconnecting switch having a disconnecting switch-side fixed contact and a disconnecting switch-side moving contact that linearly reciprocates in a hollow disconnecting switch-side conductor;
an earthing switch being disposed between the other main circuit conductor and the sealed tank, the earthing switch having an earthing switch-side fixed contact and an earthing switch-side moving contact that linearly reciprocates in a hollow earthing switch-side conductor; and
an operating shaft allowing the disconnecting switch-side moving contact and the earthing switch-side moving contact linearly reciprocates with the rotation thereof, the operating shaft being disposed on the bisector of an open angle of substantially a right angle formed by axes of the disconnecting switch-side conductor and the earthing switch-side conductor;
a two-hole lever connected to the operating shaft to allow an arc motion; and
two curved links, each one end thereof is connected to the two-hole lever and the other end thereof is respectively connected to a disconnecting switch-side moving contact or an earthing switch-side moving contact, wherein
when two connecting points where the disconnecting switch-side moving contact and the two-hole lever are connected to the disconnecting switch-side curved link and two connecting points where the earthing switch-side moving contact and, the two-hole lever are connected to the earthing switch-side curved link are axisymmetric with respect to the bisector, both the disconnecting switch and the earthing switch are in an open state,
when the two-hole lever moves at a predetermined angle from the open state to the disconnecting switch-side, the disconnecting switch is in a closed state, and
when the two-hole lever moves at a predetermined angle from the open state to the earthing switch-side, the earthing switch is in a closed state.
2. The disconnecting switch with earthing switch according to claim 1 , wherein
a sliding friction reducing member is disposed on the each inner circumferential surface of the disconnecting switch-side conductor and the earthing switch-side conductor on which the disconnecting switch-side moving contact and the earthing switch-side moving contact slide.