US1363666A - Electrical system - Google Patents

Description

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UNITED STATES PATENT OFFICE.

JOSEPH N. MAHONEY. OF WILKINSBURG, AND WALTER H. AUSTIN, OF SWISSVALE,

PENNSYLVANIA, ASSIGNORS T WESTINGHOUSE ELECTRIC AND MANUFACTUR- ING COMPANY, A CORPORATION OF PENNSYLVANIA.

ELECTRICAL SYSTEM.

- Application filed August a, 1916. Serial No. 117,666.

[0 all whom it may concern:

Be it known that we, Josnru N. MAuoXEY, a citizen of the l'nited States, and a resident of "ilkinsburg. in the county of Alleghen and State of Pennsylvania, and 'ALTER 1 Au 'rix, a citizen of the l'nited States, and a resident of Swiss-vale. in the count of Allegheny and State of Pennsylvania, lia'ie iuxentcd a new and useful Improvement in Electrical l, Systems, of which the following specification is a. continuation in part of Pat out No. 1.27%,967, issued Sept. 17. 1918.

Our invention relates to electrical systems and devices and particularly to means for automatically connecting feeder circuits together, under predetermined conditions.

)ue object of our invention is to provide a system of the above-indicated character that shall have means dependent upon the sum of the voltages of the circuitsthat are to he connected together for controlling the opening and closing of the connection be tween the same.

Another object of our invention is to proide means whereby the limitin" resistance, that is connected in series with t 1e actuating and holding windings of the connecting circuit interrupter, is adapted to be shortcirruited only when the lnterrupter is being closed.

In the, car ring out of our invention, we provide a cu "lit interrupter for operatively connecting two feeder circuits together and means for so controlling the interrupter that the circuits will be connected together only when the sum of the voltages on the two circuils exceed a pimleterl'uined value. Means is also provid d whereby the limiting resistor. that is connected in series with the actuating winding of the interrupter, is adspted to be slnn't-l'irclllted on] when the interrupter is being closed. T nus, only a relatively small current traverses the actuating winding when the interrupter is in its fullopen and in its closed position.

Figure 1 of the accompanying drawings is a diagrammatic view of an electrical circuit en'ihodying our invention, and Fi s. 2, 3, 4, I and 6 are diagrammatic views of electrlcal i-ir'r-uils embodying modified forms of our invention.

Two feeder conductors 1 and 2, having a common return conductor 3, are adapted to be operatively connected together by a. cir- Speciflcation of Letters Patent.

Patented Dec. 28, 1920.

cuit interrupter 4 when the sum 01 um witages between the feeder conductors and the common return conductor exceeds a predetermined value.

In Fig. 1 of the drawings, the circuit interrupter 4 comprises main stationary contact members 5 and 6. a main bridging contact member 7, a toggle mechanism 8, an actuating electromagnet 9, an auxiliary stationary contact member 10, an auxiliary movable contactmember 11 and a. limiting resistor 12. A relay 13,comprising-a movable core member 14, two windings 15 and 16, a movable bridging contact member 17 and stationary contact members 18, is provided for the purpose of controlling the circuit of the actuating electromagpct 9. One terminal of the winding 15 is connected, through a resistor 19, to the feeder conductor 2, and the other termiualof the Winding 15 is connected to the conductor 3. One terminal of the winding 1'6 is connected, throu h a resistor 20, to the conductor 1 and t eother terminal of the winding 16 is connected to the common return conductor 3.

The windings 15 and 16 of the relay 13 are so proportioned that the movable bridging contact member will en age the stationary contact members 18 on y when the sum of the voltage drops between the feeder conductors l and 2 and the common return conductor 3 exceeds a predetermined value. W hen this occurs, current is ermitted to traverse the winding of the e ectromugnet 9, and the circuit interrupter 4 is closed. The contact members 10 and 11 constitute the separable terminals of a short-circuit connection across the terminals of the re-- sister 12 and are so arranged that, when the circuit interrupter 4 is closed, they are disengaged to there )y limit the current'that traverses the winding of the electroma et 9.

In Fig. 2 of the drawings,the wlnding of the actuating electromagnet 9 is connected in series with the limiting resistor 12 and the circuit, thus constituted, is so connected to two resistors 19 and 20 that the winding of the electromagnet 9 will be supplied with current proportional to the sum of the voltage dro 5 across the feeder conductors 1 and 2 and t a common return conductor 3. The circuit interru ter 4 is provided with an auxiliary [nova le contact member 11 that is adapted to engage auxiliary stationary contact members 10 for the urpose of shortcircuiting the resistor 12 w en the circuit interrupter 4 is in its openposition, thereby permitting sufficient current to traverse the 6 winding of the electromagnet 9 to actuate the circuit interrupter 4 when the sum of the volta e drops is a redetermined value.

In i 3 of the rawings, one terminal of the win ing of the actuating electromagnet 9 of the circuit interrupter 4 is connected to one terminal of the resistors 19 and 20 and its other terminal is connected to the conductor 3. The other terminals of the resistors 19 and 20 are connected to the conductors 1 and 2, respectively. With such an arrangement, the winding of the electromagnet 9 is supplied with current proportional to the sum of the volta e drops across the feeder conductors l and 2 and the return conductor 3, but no means is rovided for limiting the amount of current t lat traverses the winding of the electromagnet 9 when the circuit interrupter 4 is in its open or in its closed position.

In Fig. 4 of the drawings, one terminal of the winding of the clectromagnet 9 is con iiected to the conductor 2 and its other terminal is connected to the stationary contact member 21 of a relay 22. One terminal of the winding 23 of the rela 22 is connected to one terminal of each the resistors 19 and 2(), the other terminals of which are connected to the conductors l and 2, res ectively. The other terminal of the win ing 23 i connected to a stationary contact matinber 24 and also to the common return conductor 3. The stationary contact members 21 and 24 of the relay 22 are adapted to be bridged by a movable contact member 25 when the sum of the voltage drops across the feeder conductors 1 and 2 and the return conductor 3 exceeds a predetermined value. Thus, the winding of the electromagnet 9 will be supplied with energy only when the relay 22 is closei'l.

Since it is advisable to limit the current in the actuating windin of-the circuit'interrupter when the circuit interrupter is in its open and closed positions and to permit a maximum current to traverse the windin only when the interrupter is being closer, we provide the circuit interrupter .4, as shown in Fig. of the drawings, with two auxiliary movable contact members 26 and 55 27 that are adapted to engage stationary contact members 28 and 29 and'30 and 31, respectively. The actuating eleetromagnet 9 comprises two windings 32 and 33. One terminal of the winding 33 is connected to the conductor 2 and the other terminal of the winding 33 is connected to one terminal of a resistor 34 One-terminal of the winding 32 is connected to the conductor 1 and the other terminal of the winding 32 is connected to 65 one terminal of a resistor 35. The other terminals of the resistors 34 and 35 are connected together and to the stationary contact member 36 of a relay 3?. The stationary contact member 36 i also connected to one terminal of the winding 38 of the relay 37 the other terminal 'of which is connected to the conductor 3. The stationary contact member 31, of the circuit interrupter 4 is, connected to the stationary contact member 39 of the relay 37 and the stationary contact member 28 of the circuit interrupter 4 is connected to the stationary contact member 40 of the relay 37. The stationary contact members 29 and 30 of the circuit interru ter 4 are connected to one terminal of the wmd- R0 ings 32 and 33, respectively. The relay 37 is provided with a bridging contact member 41 that is adapted to engage the stationary contact members 36, 39 and 40 when the sum of the voltage drops across the feeder conductors 1 and 2 and the return conductor 3 exceeds a predetermined value.

As shown in Fig. 5 of the drawings, when the sum of the voltages is below a predetermined value, the windings 32 and 33 will not be sufficiently energized to hold the main contact members of the circuit interrupter 4 in their closed positions, and the resistors 31 and 35 will be connected in circuit with the respective windings of the actuating electromagnet 9. However, when the interrupter 4 is open, the bridging contact members 26 and 27 engage their respective stationary contact members in such manner that, when the relay 37 is again actuated, the resistors 34, and 35 will be short-circuited, and sufficient current will be permitted to "traverse the windin 32 and 33 to close the interrupter 4. when the interrupter 4 is closed, the bridging contact members 26 and 27 are disengaged from their respective stationary contact members, and the short-circuit connections across the terminals of the resistors 34 and 35 are opened, thereby reducing the current that traverses the windings 32 and 33. i

In Fig. 6 of the drawings, the electromagnet 9 is provided with a single winding, one terminal of which is connected .to one terminal of the winding 42 of the relay 43 and the other terminal of the rela is connectedto the conductor 3. The re ay 43 is adapted to cause its movable bridging contact member 44 to engage its stationary'contact members 45 for effectin a short-circuit connection around the terminals of the resistor 12 only when the interrupter 4 isopen and the'sum of the voltage dro s across the feeder conductors 1 and 2 an the return conductor 3 exceeds a predetermined value. The interrupter 4 is provi ed With an aux; iliary bridging contact member 11 and auxiliary statlonary contact members; 10 for opening the short-circuit connectionf as soon as the interrupter is closed. thereby reducinell ia a the current that traverses the winding of the electromagnet 9 when the interrupter is in its closed position.

'We do not limit our invention to the articular structures and arrangements ilustrated, as it may be variously modified within the spirit and scope of the appended claims.

We claim as our invention:

1. In a; system of distribution, the combination? with two feeder conductors, a

common return conductor, and a circuit interrupter for operativ v connecting the feeder conductors togeti. r, of means actuated under all conditions, in a ordain-e with the sum of the voltage drop ,{between the respective feeder conductors and the return conductor for controlling the opening and closing of the circuit interrupter.

2. In a system of distribution, the comhination with a circuit interrupter and an actuating elcctromagnet therefor, of a resistor, and means for so controlling the effectiveness of the resistor in the circuit that it limits the current traversing the electroma rnet only when the interrupter is in its ful -o ion and in its closed position.

n a system of distribution, the combination with n circuit interrupter, an actuating and holding, electromagnet therefor and a resistor operatively connected in circuit with the said electromagnet, of means for shortcircuiting the resistor only when the circuit interrupter is being closed.

4. The combination with two i'ecder conductors, a common return conductor, and a circuit i ntcrrupter for connecting the feeder conductors together, of an actuating electromagnct responsive, under all conditions. to the sum of the voltage drops between the i'ccdcr conductors and the return conductor for controlling the operation of the interrupter.

.531 a system of distribution, the combination with two feeder conductors, a common return conductor, and a circuit interrupter for operatively connecting the two i'ccdcr conductors together, of means for closing the interrupter and for holding it in its closed position, and means responsive, under all conditions, to the sum of'the Yoltage drops between the two i'ecdcr conductors and the common return conductor for controlling the operation of the said closing and holding means.

6. In a system of distribution, the combination with two feeder conductors, a common return conductor, end a, circuit interrupter opcratively connecting the two feeder conductors together, of electromagnptic means for closingand holding the interrupter in its closed position, and means responsive, under all conditions, to the sum of the voltage drops across thetwo feeder conductors and the return conductor for so con trolling the operation of the electromagnetic means that the interrupter will be held in its closed position only when the sum of the voltage drops exceeds a predetermined value,

7. In a system of distribution, the comhinution with two feeder conductors and a common return conductor, of a circuit interrupter res )onsive, under all conditions, to the sum of the voltage drops across the two feeder conductors and the return conductor for operatively connecting the feeder conductors together, under predetermined conditions.

8. In a system of distribution, the combination with two feeder circuits, of means responsive, under all conditions, to the sum of the voltage drops across the two circuits for opcratii'ely, connecting the circuits together only when the sum of the voltage lll'flllh exceeds a predetermined value.

5). In a circuit interrupn-r, the combination with an actuating electromagnet and a resistor for reducing the current traversing the same. of means for short-circuiting the stor only when the interrupter is being closed.

11). In a circuit interrupter, the combination with an actuating electromagnet and a resistor normally connected in series therewith. of means for obliterating the limiting effect of the resistor on the electromagnet only when the interrupter is being actuated.

In tcstimonym'hercof we have hereunto subscribed our names this 22nd day of Aug, i916.

JOSEPH N. MAHONEY. WALTER M. AUSTIN

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