Power system including a circuit providing smart zone selective interlocking communication

Patent metadata

Field	Value
Publication number	US-9379537-B2
Application number	US-201314058434-A
Country	US
Kind code	B2
Filing date	Oct 21, 2013
Priority date	Oct 21, 2013
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A power system includes main circuit interrupters each having a load output, feeder circuit interrupters, a number of tie circuit interrupters, and a circuit. The circuit is structured to block communication, at least when at least one of the tie circuit interrupters has an open state between a first and a second of the main circuit interrupters, of a zone selective interlocking output of one of the feeder circuit interrupters having a line input electrically connected to the load output of the first main circuit interrupter to a zone selective interlocking input of the second main circuit interrupter, and of a zone selective interlocking output of a different one of the feeder circuit interrupters having a line input electrically connected to the load output of the second main circuit interrupter to a zone selective interlocking input of the first main circuit interrupter.

First claim

What is claimed is:

1. A power system comprising:
a plurality of main circuit interrupters, each of said main circuit interrupters including:
a line input,
a load output, and
a zone selective interlocking input;

a number of tie circuit interrupters, at least one of said number of tie circuit interrupters including:
a first terminal electrically connected to the load output of a first one of said main circuit interrupters,
a second terminal electrically connected to the load output of a different second one of said main circuit interrupters,
separable contacts electrically connected between said first terminal and said second terminal, said separable contacts having an open state and a closed state,
a zone selective interlocking input, and
a zone selective interlocking output;

a plurality of feeder circuit interrupters, each of said feeder circuit interrupters including:
a line input electrically connected to the load output of one of said main circuit interrupters,
a load output, and
a zone selective interlocking output; and

a circuit structured to block communication, at least when said at least one of said number of tie circuit interrupters has the open state, of the zone selective interlocking output of one of the feeder circuit interrupters having the line input electrically connected to the load output of said first one of said main circuit interrupters to the zone selective interlocking input of said different second one of said main circuit interrupters, and of the zone selective interlocking output of a different one of the feeder circuit interrupters having the line input electrically connected to the load output of said different second one of said main circuit interrupters to the zone selective interlocking input of said first one of said main circuit interrupters.

2. The power system of claim 1 wherein said circuit comprises:
a first diode including an anode electrically connected to the zone selective interlocking output of said at least one of said number of tie circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said first one of said main circuit interrupters;
a second diode including an anode electrically connected to the zone selective interlocking output of said at least one of said number of tie circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said different second one of said main circuit interrupters;
a third diode including an anode electrically connected to the zone selective interlocking output of said one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said first one of said main circuit interrupters;
a fourth diode including an anode electrically connected to the zone selective interlocking output of said one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said at least one of said number of tie circuit interrupters;
a fifth diode including an anode electrically connected to the zone selective interlocking output of said different one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said different second one of said main circuit interrupters; and
a sixth diode including an anode electrically connected to the zone selective interlocking output of said different one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said at least one of said number of tie circuit interrupters.

3. The power system of claim 1 wherein said circuit comprises:
a first auxiliary contact having a state corresponding to the open state or the closed state of said separable contacts and electrically connected between the zone selective interlocking output of said at least one of said number of tie circuit interrupters and the zone selective interlocking input of said first one of said main circuit interrupters;
a second auxiliary contact having said state corresponding to the open state or the closed state of said separable contacts and electrically connected between the zone selective interlocking output of said at least one of said number of tie circuit interrupters and the zone selective interlocking input of said different second one of said main circuit interrupters;
a first diode including an anode electrically connected to the zone selective interlocking output of said one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said first one of said main circuit interrupters;
a third auxiliary contact having said state corresponding to the open state or the closed state of said separable contacts and electrically connected between the zone selective interlocking output of said one of said feeder circuit interrupters and the zone selective interlocking input of said at least one of said number of tie circuit interrupters;
a second diode including an anode electrically connected to the zone selective interlocking output of said different one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said different second one of said main circuit interrupters; and
a fourth auxiliary contact having said state corresponding to the open state or the closed state of said separable contacts and electrically connected between the zone selective interlocking output of said different one of said feeder circuit interrupters and the zone selective interlocking input of said at least one of said number of tie circuit interrupters.

4. The power system of claim 1 wherein said circuit comprises:
a first diode including an anode electrically connected to the zone selective interlocking output of said at least one of said number of tie circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said first one of said main circuit interrupters;
a second diode including an anode electrically connected to the zone selective interlocking output of said at least one of said number of tie circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said different second one of said main circuit interrupters;
a third diode including an anode electrically connected to the zone selective interlocking output of said one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said first one of said main circuit interrupters;
a first auxiliary contact having a state corresponding to the open state or the closed state of said separable contacts and electrically connected between the zone selective interlocking output of said one of said feeder circuit interrupters and the zone selective interlocking input of said at least one of said number of tie circuit interrupters;
a fourth diode including an anode electrically connected to the zone selective interlocking output of said different one of said feeder circuit interrupters and a cathode electrically connected to the zone selective interlocking input of said different second one of said main circuit interrupters; and
a second auxiliary contact having said state corresponding to the open state or the closed state of said separable contacts and electrically connected between the zone selective interlocking output of said different one of said feeder circuit interrupters and the zone selective interlocking input of said at least one of said number of tie circuit interrupters.

5. The power system of claim 1 wherein said circuit comprises:
a first auxiliary contact having a state corresponding to the open state or the closed state

Assignees

• Eaton Corp

Inventors

• Hulse Robert Eugene

Classifications

• G05B2219/25416

  Interrupt · CPC title

• G05B2219/2639

  Energy management, use maximum of cheap power, keep peak load low · CPC title

• H02H7/30 Primary

  Staggered disconnection · CPC title

• H02H7/262

  involving transmissions of switching or blocking orders · CPC title