US1352451A - Circuit-interrupting system - Google Patents

Description

S. Q. HAYES.

CIRCUIT INTERRUPTING SYSTEM.

APPLICATION men MAY :5. 1911.

352 45 1 v Patented Sept. 14, 1920.

a ll E a 21% v 22 L as 26' WITNESSES: INVENTOR J/P/I'fl Q fiayea. Mil, "(4W I ATTORNEY UNIT an SKTATES PATENT OFFICE.

STEPHEN Q. HAYES, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 WESTJ'IQGHOUS! ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

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i Specification of Letters Patent. Patented Sept, 14, 192() Application and m 15, 1917. Serial 110. 168,663.

To all whom it may concern: i

Be it known that I TEPHEN Q. Hares, a citizen of the Unitedfitates, and a resident of Pittsburgh in.the county ofAllegheny and State of vented a new and useful Improvement 111 Circuit-Interrupting Systems, of which the following is a specification.

My invention relates to systems of distribution and particularly to the circuit interruptin means therefor.

.One ob ect of; myfinventionis to rovide means for disconnectin portions 0 a load from a circuit, in a predetermined order to preclude the load on the "circuit from bem maintained in excess of a predetermine value.

Another object of my invention is to revide a system of the above indicated 0 aracter that shall be simple to construct and efl'ective and accurate in its operation,

In practising my invention, I provide a main suppl or load circuit, a plurality of branch 10a circuits and circuit mterrupters for connecting the branch circuits to'the main circuit. The trip coil of each interrupter is so controlled by auxiliary or pallet switches on the'other interrupters t when the load on the main circuit exceeds the predetermined value, one interrupter at a time will be tripped until such load is removed that the load on the main circuit is reduced to the Krdetermined value.

The single gure of the accompanying is a diagrammatic view of a sysdrawing distribution embodying y inventem of tion.- i

A main 1 ad circuit 1' is adp'pted; to supcurren to a pluralit of loads 2, 3,4

and 5 through branch or code! cit Units 6,7, 8 and 9, respectively. Circuit interrupters 10, 11, 12 and 13 are connected between the respective feeder circuits 6, 7, 8 and 9 and the load circuit 1. 4

The circuit interrupters 10, 11,12 and 13 severally comprise stationary contactmembers 14, move 1e bridging contact members 15, 'a trip coil 16 and an auxiliary doublethrdw switch 17 having a movable bridging contact member 18, a pair ofstationary contact members 19 and a pair of stationary "contact members 20. The main circuit 1 is provided with two relays 21 and 22 that are operatively connected through series transformers 23 and 24 to the circuit 1; The re- Pennsyl'vania, have ininterrupter 13 hat la 21 and 22 are adapted to be actuated to e ect closure of their contact members 25 and 26 when a predetermined load traverses the circuit 1.

One terminal of the trip coil 16 of each of the circuit interrupters is connected to one conductor of the circuit 1, and the other terminalof each of the trip coils 16 is connected to one of the stationary contact members 19 ofits auxiliary switch 17. The other stationary contact member 19 and the correspondingcontact member 20 of the interru ter 13 are connected to a circuit 27 that is connected to one conductor of the circuit 1 and which comprises the contact members 25 and 26 of the relays 21 and .12. The cor-responding contact members 19 and 20 of each of-the other interrupters are connected to one of the stationary contact members 20 of its adjacent interru; one of the stationary contact members 20 of the interrupter 13 is connected to one of 'the other stationary contact members 19 and 20 of the interrupter 12. Thus, when the is in its open position and the interrupter 12 is in its closed position, the circuit through the trip coil 16 of the interrupter 1.2 is so connected in circuit with the contact members 25 and 26 of the re; lays 21 and 22 that if they are, enga ed the circuitainterrupter 12 will be trippe When the load that traverses the circuit 1 exceeds a predetermined value it is desirable to reduce this load to a safe value and in order to obtain this, it desirable to disconnect the loads 2, 3, 4 and 5 in a certain sequence. That is, when the load 5 is dis connectedif the load on the circuit 1 does not exceed a predetermined .value, it is not desirable to disconnect the loads 2, 3, and 4. However, if the load traversing the circuit 1 still exceeds'the desired value for that circuit the load 4 isdisconnected, and similarly the remaining loads 2 and 3 are successively disconnected to reduce the load traversing the circflit 1 to the predetermined value.

The relays 21 and 22 are so adjusted that their contact members 25 and 26 are engaged when the load traversing the circuit 1 exceeds a predetermined value, and when the contact members 25 and 26 are engaged. the trip coil 16 of the interraplter 13 is energized to trip the same.' en the interrupter 13 is tripped, its auxiliary switch 17 so connects the trip coillfi 'of the interrupter That is,

.load on the circuit 1 has not 5, the interrupter 12 -auxiliary sufiiciently by that if the disconnection of the loads 4 and 5 i not sufiicient to reduce the load on the circuit 1 t'o'such value that the relays 21 and 22 are inoperative, the circuit interrupter 11 will be tripped. In a like manner the interrupter 10 will be tripped if the disconnection of the loads 3, 4 and 5 are not sufficient to reduce the loa on the circuit 1 to the predetermined value that is desired not to be exceeded therein.

My invention is not limited to the specific structures illustrated nor to the method of energizing the relays andtrip coils, as it may be variously modified Without departing from the s irit and scope of the invention as set fort in the appended claims.

I claim as my invention:

1. The combination with a main circuit,

a plurality of feeder circuits 'arid interrupters for connecting the feeder circuits to the main circuit, of a rela responsive to the load in the main circuit or controlling the tripping of the interrupters, and auxiliary switches actuated by the interrupters for successively connecting the tripping devices in series with the contact relay.

2. The combination ivith a main supply circuit, a plurality of branch circuits therefor and circuit interrupters for connecting the branch circuits to the main circuit, of means responsive to the load on the main circuit for tripping the interrupter-s, and auxiliary switches actuated b the interrupters for successively connecting the tripping means to the main circuit.

members of the 3. The combination 'with a main circuit, a plurality of feeder circuits, circuit interrupters for connecting the feeder circuits to the main circuit and trip coils for the interrupters, of a relay responsive to the load on the main circuit for controlling the energization of the trip coils, and means actuated by the interrupters for successively connecting the trip coils in series with the contact members of the relay.

4. The combination with a main circuit, a plurality of feeder circuits, circuit interrupters for connecting the feeder circuits to the main circuit and trip coilsfor the interrupters, of a relay responsive to the load on the main circuit for controlling the energization of the trip coils, and means actuated by the interrupters for normally maintaining the circuit of the trip coils 0 en and for connecting the same successive y in series with the contact members of the relay.

5. The combination with a main circuit, a plurality of feeder circuits, circuit interrupters for connecting the feeder circuits to the main circuit and tripping devices therefor, of a relay responsive to the load on the main circuit for controlling the tripping devices, and means actuated by the interrupters for connecting the tripping devices in series with contact members of the relay in a redetermined order)" 6. e combination with'a main circuit, a plurality of feeder circuits, circuit interrupters for connecting the feeder circuits to the main circuit and tripping devices therefor, of a rela responslve to the load on the main circui or controlling the tripping de vices, and means actuated by the interrupters for successively connecting the trip ping'devioes in series with the contact members of the relay to cause the interrupters to be tripped in a predetermined order.

In testimony whereof, I have hereunto SlbSCIllElBd my name this 28th day of April, 1 17.

STEPHEN Q. HAYES.

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