Inline disconnect for multiphase electric utility line applications
A group-operated switching system for multi-phase electrical transmission lines including a number of inline axial switches for opening and closing circuits to control electrical flow through the transmission lines. The switches include axially mounted load break vacuum interrupters and are mechanically and electrically isolated from each other and from a control box. The control box communicates with the inline switches via RF communications. Power for the switch electronics and operations can be provided from line power, a battery, or a capacitive source.
1. A group-operated switching system for multi-phase electrical transmission lines, comprising:
a plurality of inline axial switches;
a plurality of transmission lines, wherein each of the inline axial switches is disposed within one of the transmission lines for selective opening and closing, each of the inline axial switches having at least one load break vacuum interrupter operable to control electrical flow through one of the electrical transmission lines; and
a control box connected to the plurality of inline axial switches via radio frequency transmission and reception, for controlling operation of the plurality of inline axial switches and providing status information to a user;
wherein each of the plurality of inline axial switches has an electronic component for controlling operation and providing status information; and wherein the plurality of inline axial switches are adapted for group operation and are mechanically and electrically isolated from each other and from the control box.
2. The switching system as in claim 1 , wherein each of the plurality of inline axial switches includes a motorized cabinet for actuating the one inline axial switch.
3. The switching system as in claim 2 , wherein the motorized cabinet and inline axial switch electronic component are powered from line power using a current transformer.
4. The switching system as in claim 2 , wherein the motorized cabinet and inline axial switch electronic component are powered using a battery.
5. The switching system as in claim 2 , wherein the motorized cabinet and inline axial switch electronic component are powered using a capacitive source.
6. The switching system as in claim 2 , wherein the inline axial switch electronic component is powered from line power.
7. The switching system as in claim 1 , wherein the at least one load break vacuum interrupter is operable in high-voltage, high-current load conditions.
8. A switching system for an electrical transmission line, comprising:
an inline switch disposed within the transmission line for selective opening and closing, the inline switch having at least one load break vacuum interrupter electronically operable to control electrical flow through the transmission line; and
a control box connected to the inline switch via radio frequency transmission and reception, for controlling operation of the inline switch and providing status information to a user; wherein the inline switch is mechanically and electrically isolated from the control box.
9. The switching system as in claim 8 , wherein the inline switch comprises:
a motorized cabinet for actuating the at least one load break vacuum interrupter; and
switch electronics for communicating with the control box and for controlling the motorized cabinet.
10. An improved arrangement for group-operated switches for electrical transmission lines, comprising:
a. a utility pole for supporting a plurality of electrical transmission lines;
b. a plurality of first strain insulators for insulating the plurality of electrical transmission lines to ground, each of the first strain insulators being connected to the pole;
c. a plurality of second strain insulators, each of the second strain insulators being connected to one of the first strain insulators and one of the electrical transmission lines;
d. a plurality of inline switches, each disposed within one of the electrical transmission lines and each being connected across one of the second strain insulators; and
e. a control box disposed at the utility pole, for controlling, through RF communications, operation of the plurality of inline switches to control electrical flow through the plurality of electrical transmission lines; wherein each of the plurality of inline switches includes at least one vacuum interrupter for selectively opening or closing a circuit that includes the electrical transmission line upon which the inline switch operates, each of the plurality of inline switches including a motorized cabinet housing, a gear drive mechanism for actuating the vacuum interrupter, and control electronics for communicating with the control box and controlling the gear drive mechanism, and each of the plurality of inline switches being electrically and mechanically isolated from other inline switches and from the control box.
11. The arrangement according to claim 10 , wherein each of the inline switches includes the gear drive mechanism housed in the motorized cabinet for actuating the inline switch.