US2495181A

US2495181A - Disconnect switch

Info

Publication number: US2495181A
Application number: US751161A
Authority: US
Inventors: Paul R Pierson
Original assignee: Westinghouse Electric Corp
Current assignee: CBS Corp
Priority date: 1947-05-28
Filing date: 1947-05-28
Publication date: 1950-01-17
Anticipated expiration: 1967-01-17

Description

Jan. 17,1950 P, R, PERSON I 2,495;1s1

DISCONNECT SWITCH Filed May 28, 1947 3 Sheets-Sheet l WITNESSES: INVENTOR Y Pau/ E Hie/.6 00. r Y 1 w Jan. 17, 1950 R, PERSON 2,495 181 v DISCONNECT SWITCH Filed May 28, 1947 5 Sheets-Sheet 2 WITNESSES: I DNVENTOR PQu/E 1 /89/1900.

Jan. 17, 1950 P. R. PIERSON DISCONNECT SWITCH Filed May 28, 1947 5 Sheets-Sheet 5 WITNESSES: lNVEfrlTOR a. W -P:7u/,. l /ers on.

II are connected to a secondary shaft 25 which is mounted in suitable bearings 26. The switch blades are connected to their respective shafts by levers 21 and insulators 28.

The secondary shaft 23 is connected to a main shaft 29 by means of a tie-rod 3| and levers 32, 33 and 34 and a bolt 35. Likewise, the secondary shaft 25 is connected to the main shaft 29 by means of a tie-rod 36 and levers 31, 38 and 39 and a bolt 4|. The

levers

33 and 38 are rotatably mounted on the shaft 29. The

levers

34 and 39 are secured to the shaft 29. The lever 34 may be connected to the lever 33 by the bolt 35. Likewise, the lever 39 may be connected to the lever 38 by the bolt 4|. The shaft 29 may be rotated by a gear mechanism 42 which may be operated by a crank 43, see Fig. 1. In this manner the shaft 29 may be rotated to open and close both groups of disconnect switches in the usual manner.

In order that the circuit breaker and the disconnect switches may be utilized for grounding one or the other of the power circuits connected to the disconnect switches, provision is made for locking either group of switches in a predetermined position without interfering with the operation of the other group of switches. Thus, if it is desired to ground the power conductors connected to the switches of group l9 the grounding operation can be performed in two ways. The switches of group It] may be locked in the closed position by removing the bolt 35 from the position shown by the full lines in Figs. 2 and 3, and inserting it through the lever 33 into a block 44 which is secured to the housing l2. The removal of the bolt 35 from its position shown by the full lines and inserting it in the position shown by the dotted lines, releases the lever 33 from the lever 34 and secures the lever 33 to the block 44, thereby retaining the switches of group ID in the closed position. The shaft 29 may then be rotated to open the switches of group II and cause them to engage the grounding contact members 22.

If desired, the switches of group Il may be locked in the grounded position by removing the bolt 4| from the position shown by the full lines in Figs. 2 and 4 and inserting it through the plate 38 into a block 45 which is secured to the housing 2. In this manner the lever 38 is released from the lever 39 and is secured to the block 45 to retain the switches of group I l in the grounded position.

The circuit breaker may then be closed, thereby grounding the power conductors connected to the switches of group I0. Furthermore, neither group of switches can be inadvertently operated to remove the ground while the circuit breaker is closed since both groups are locked in the desired position.

If it is desired to ground the power conductors connected to the switches of group II, the switches of group II are locked in the closed position by inserting the bolt 4| through the lever 38 into a block 46 which is secured to the housing I2. The switches of group ID are then operated to the grounded position by rotating the shaft 29 and they may be locked in the grounded position by inserting the bolt 35 through the plate 33 into a block 41 which is secured to the housing I2 as shown in Fig. 3.

In this manner, either group of switches may be locked in one or the other of two predetermined positions without interfering with the operation of the other group of switches. Furthermore, both groups may be released from the operating mechanism and locked in one or the other of two predetermined positions.

As previously explained, the grounding operation may be performed in another way. Thus, if it is desired to ground the circuits connected to the switches of group I0, both groups of switches are opened, as a six pole gang, under proper interlock protection to insure that the associated circuit breaker is open. The six poles engage the grounding contact members in the open position. The switches of group H are then locked in the grounded position with the bolt 4| and the switches of group ID are returned to the closed position, thereby completing the circuit to the terminals of the circuit breaker. The grounding of this circuit can then be accomplished by closing the circuit breaker.

If it is desired to ground the circuits connected to the switches of group II the operation is similar to the foregoing except that the switches of group H] are locked in the grounded position with the bolt 35 and the switches of group II are returned to the closed position. The circuits are then grounded by closing the circuit breaker.

From the foregoing description it is apparent that I have provided a mechanism for operating two groups of disconnect switches when it is desired to operate both groups simultaneously. If it is desired to operate one group independently of the other, this may be readily done with the mechanism herein described.

Furthermore, either group may be locked in one or the other of two predetermined positions without interfering with the operation of the other group. As explained hereinbefore, the present structure is particularly suitable for operating disconnect switches which are utilized in conjunction with an automatically controlled circuit breaker for grounding the power circuits connected to the disconnect switches.

Since numerous changes may be made in the above-described construction, and different embodiments of the invention may be made without departing from the spirit and scope thereof, it is intended that all matter contained in the foregoing description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

I claim as my invention:

1. In a switchgear structure, in combination,

a plurality of disconnect switches, a main shaft,

crank means for rotating said shaft, a plurality of actuating means for opening and closing said switches, lever means for selectively connecting said actuating means to said main shaft to operate preselected switches independently of the other switches, and bolt means cooperating with said lever means for selectively locking said switches in predetermined positions.

2. In a switchgear structure, in combination, a plurality of disconnect switches, a main shaft, crank means for rotating said shaft, a plurality of actuating means for opening and closing said switches, lever means for selectively connecting said actuating means to said main shaft to operate preselected switches independently of the other switches, and bolt means cooperating with said lever means for selectively locking said switches in predetermined positions without interfering with the operation of the other switches.

3. In a switchgear structure, in combination, a plurality of disconnect switches, a main shaft, crank means for rotating said shaft, a plurality of actuating means for opening and closing said switches, lever means for selectively connecting said actuating means to said main shaft to 0perate preselected switches independently of the other switches, and bolt means cooperating with said lever means for selectively locking said actuating means to retain preselected switches in predetermined positions.

4. In a switchgear structure, in combination, a plurality of disconnect switches, a main shaft, crank means for rotating said shaft, a plurality of actuating means for opening and closing said switches, lever means for selectively connecting said actuating means to said main shaft to operate preselected switches independently of the other switches, and bolt means cooperating with said lever means for selectively locking said actuating means to retain preselected switches in predetermined positions without interfering with the operation of the actuating means for the other switches.

5. In a switchgear structure, in combination, a plurality of groups of disconnect switches, a main shaft, gear means for rotating said shaft, a secondary shaft for actuating each group of switches, lever means for selectively connecting said secondary shafts to said main shaft to operate a preselected group of switches independently of the other switches, and bolt means cooperating with said lever means for selectively locking groups of said switches in predetermined positions.

6. In a switchgear structure, in combination, a plurality of groups of disconnect switches, a main shaft, gear means for rotating said shaft, a secondary shaft for actuating each group of switches, lever means for selectively connecting said secondary shafts to said main shaft to operate a preselected group of switches independently of the other switches, and bolt means cooperating with said lever means for looking a preselected group of switches in a predetermined position without interfering with the operation of the other switches.

'7. In a switchgear structure, in combination, a plurality of groups of disconnect switches, a main shaft, gear means for rotating said shaft, a secondary shaft for actuating each group of switches, lever means for selectively connecting said secondary shafts to said main shaft to operate a preselected group of switches independently of the other switches, and bolt means cooperating with said lever means for selectively locking each secondary shaft against rotation to retain its group of switches in a predetermined position.

8. In a switchgear structure, in combination, a plurality of groups of disconnect switches, a main shaft, gear means for rotating said shaft, a secondary shaft for actuating each group of switches, lever means for selectively connecting said secondary shafts to said main shaft to operate a preselected group of switches independently of the other switches, and bolt means for selectively locking the connecting means for each secondary shaft in a predetermined position to retain the switches operated by said shaft in a preselected position without interfering with the operation of the other switches.

PAUL R. PIERSON.

REFERENCES CITED UNITED STATES PATENTS Name Date Iglehart Feb. 20, 1945 Number