ARC RESISTANT EXHAUST AND INTAKE FOR DRIVES AND SWITCHGEAR

• US 20200083677A1
• Filed: 09/06/2018
• Published: 03/12/2020
• Est. Priority Date: 09/06/2018
• Status: Active Grant

• Current Assignee: Toshiba International Corporation (Toshiba Corporation)
• Original Assignee: Toshiba International Corporation (Toshiba Corporation)
• Inventors: Kleinecke, John, Davis, Jack, Martinez, Enrique
• Granted Patent: US 10,644,484 B2
• Time in Patent Office: Days
• CPC Class Codes: H01H 33/26 Means for detecting the presence of an arc or other discharge
• CPC Class Codes: H01H 33/703 having special gas flow directing elements, e.g. grooves, extensions
• CPC Class Codes: H02B 1/14 Shutters or guards for preventing access to contacts shielding of isolating-contacts in withdrawable switchgear H02B11/24
• CPC Class Codes: H02B 1/565 for cabinets
• CPC Class Codes: H02B 11/133 with interlock
• CPC Class Codes: H02B 11/24 Shutters or guards
• CPC Class Codes: H02B 13/025 Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect

Abstract

In accordance with presently disclosed embodiments, an arc resistant exhaust and intake for medium and high voltage switchgear is provided. In one embodiment, an arc resistant drive system may comprise: a drive cabinet comprising a vent; and an arc resistant shutter plate assembly coupled to the drive cabinet and aligned adjacent to the vent, wherein the arc resistant shutter plate assembly comprises a plurality of shutter plates configured to automatically transition from an open position to a closed position when air pressure inside the drive cabinet exceeds a predetermined value, such that the shutter plates substantially restrict air flow through the vent in the closed position.

Claims

1. An arc resistant drive system comprising:

a drive cabinet comprising a vent;

an arc resistant shutter plate assembly coupled to the drive cabinet and aligned adjacent to the vent, wherein the arc resistant shutter plate assembly comprises a plurality of shutter plates configured to automatically transition from an open position to a closed position when air pressure inside the drive cabinet exceeds a predetermined value, such that the shutter plates substantially restrict air flow through the vent in the closed position; and

an arc gas chamber positioned to receive arc gas redirected by the shutter plate assembly, wherein the arc gas chamber is disposed on top of the drive cabinet and configured to store the received arc gas.

4. The arc resistant drive system of claim 1, wherein the arc gas chamber ventilates arc gas out of the drive cabinet.

5. The arc resistant drive system of claim 1, further comprising:

an exhaust fan assembly, wherein the arc resistant shutter plate assembly is disposed between the drive cabinet and the exhaust fan assembly, wherein the plurality of shutter plates automatically transition from the open position to the closed position when air pressure inside the drive cabinet exceeds air pressure the exhaust fan assembly by a predetermined value.

6. The arc resistant drive system of claim 1, wherein the drive cabinet further comprises an intake, and wherein the arc resistant shutter plate assembly is coupled to the drive cabinet and aligned adjacent to the intake.

7. The arc resistant drive system of claim 1, further comprising:

one or more ducts coupled to the drive cabinet for routing arc gas out of the drive cabinet.

2. (canceled)

3. (canceled)

8. An arc resistant shutter plate assembly comprising:

one or more frames; and

a plurality of shutter plates coupled to the one or more frames, wherein the plurality of shutter plates are aligned parallel to one another, and wherein the plurality of shutter plates are operable to automatically transition from an open position and a closed position based on a change in surrounding air pressure,

wherein the arc resistant shutter plate assembly is coupled to a vent of a drive cabinet and an exhaust fan assembly, wherein the arc resistant shutter plate assembly is disposed internal to the drive cabinet.

9. The arc resistant shutter plate assembly of claim 8, wherein the change in air pressure required to automatically transition the plurality of shutter plates from the open position to the closed position is 5 psi.

10. The arc resistant shutter plate assembly of claim 8, wherein the plurality of shutter plates are comprised of carbon steel.

11. The arc resistant shutter plate assembly of claim 8, wherein the plurality of shutter plates are coupled to one or more frames via hex lock nuts.

12. The arc resistant shutter plate assembly of claim 11, wherein the hex lock nuts are torqued to a value of 2-20 ft-lbs.

13. The arc resistant shutter plate assembly of claim 8, wherein the plurality of shutter plates is comprised of at least five shutter plates.

14. (canceled)

15. A method for ventilating arc gas comprising:

disposing an arc resistant shutter plate assembly over an exhaust vent, wherein the arc resistant shutter plate assembly is coupled to a drive cabinet;

automatically transitioning the arc resistant shutter plate assembly from an open position to a closed position upon a change in air pressure;

directing air flow within the drive cabinet to an arc gas chamber, wherein the arc gas chamber is disposed on top of the drive cabinet; and

ventilating air flow out of the arc gas chamber and the drive cabinet.

16. The method of claim 15, further comprising:

disposing a second arc resistant shutter plate assembly over an intake, wherein the second arc resistant shutter plate assembly is coupled to the drive cabinet.

17. The method of claim 15, wherein the arc resistant shutter plate is automatically transitioned from the open position to the closed position when the air pressure on one side of the shutter plate assembly exceeds air pressure on another side by a predetermined value.

18. The method of claim 15, further comprising receiving arc gas into an arc gas chamber redirected by the shutter plate assembly in the closed position.

19. The method of claim 18, further comprising ventilating arc gas out of the drive cabinet by the arc gas chamber.

20. The method of claim 15, further comprising positioning an exhaust fan assembly, wherein the arc resistant shutter plate assembly is disposed between the drive cabinet and the exhaust fan assembly.

21. The method of claim 15, further comprising routing arc gas out of the drive cabinet via one or more ducts coupled to the drive cabinet.