Load center that reduces trip time during short circuit faults

Patent metadata

Field	Value
Publication number	US-11283255-B2
Application number	US-202016986481-A
Country	US
Kind code	B2
Filing date	Aug 6, 2020
Priority date	Aug 6, 2020
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A load center comprises a common instantaneous tripping unit that works on a principle of solid state switching. The load center further comprises a plurality of branches of branch circuit breakers each of which is coupled to the common instantaneous tripping unit via a corresponding high power connection and a corresponding low power connection such that the common instantaneous tripping unit feeds the plurality of branches at the same time. The common instantaneous tripping unit interrupts a short circuit fault in an interruption time which is significantly reduced thus reducing or eliminating chances for a personal injury during the short circuit fault.

First claim

What is claimed is:

1. A load center comprising:
a common instantaneous tripping unit that works on a principle of solid state switching; and
a plurality of branches of branch circuit breakers each of which is coupled to the common instantaneous tripping unit via a corresponding high power connection and a corresponding low power connection such that the common instantaneous tripping unit feeds the plurality of branches at the same time,
wherein the common instantaneous tripping unit interrupts a short circuit fault in an interruption time which is significantly reduced, and
wherein the common instantaneous tripping unit contains one or more solid state switching components including power metal-oxide-semiconductor field-effect transistors (MOSFETs) each of which having a source, a drain and a gate such that the drain and the source are used for current conducting and the gate is used for switching current ON and OFF.

2. The load center of claim 1 , wherein the common instantaneous tripping unit interrupts the short circuit fault in the interruption time which is in a range of microseconds such as less than 100 microseconds.

3. The load center of claim 1 , wherein an instantaneous tripping happens when the common instantaneous tripping unit receives an instantaneous tripping signal from a branch of the plurality of branches such that the instantaneous tripping signal is provided in response to the short circuit fault.

4. The load center of claim 1 , wherein branch currents are fed by the common instantaneous tripping unit and through each branch circuit breaker of the branch circuit breakers to each branch of the plurality of branches.

5. The load center of claim 1 , wherein the branch circuit breakers have a low power connection to a gate of the common instantaneous tripping unit which allows each branch circuit breaker to signal the common instantaneous tripping unit to trip.

6. The load center of claim 1 , wherein each branch circuit breaker of the branch circuit breakers protects faults other than a short circuit fault on their own such as during an overload, an arc fault or a ground fault the branch circuit breakers open a corresponding branch circuit.

7. The load center of claim 1 , wherein during a short circuit fault once the branch circuit breakers detect the short circuit fault, a tripping signal is sent to a gate of the common instantaneous tripping unit through the low power connection and the common instantaneous tripping unit trips and turns OFF power for all branches it feeds.

8. The load center of claim 1 , further comprising:
a second common instantaneous tripping unit that feeds a second plurality of branches and only turns OFF power for the second plurality of branches instead of a whole panel.

9. The load center of claim 1 , wherein once tripped, the common instantaneous tripping unit monitors a status of one or more faulty branches such that if a faulty branch clears a short circuit tripping signal through the low power connection, the common instantaneous tripping unit can reset itself.

10. A load center comprising:
a common instantaneous tripping unit that works on a principle of solid state switching; and
a plurality of branches of branch circuit breakers each of which is coupled to the common instantaneous tripping unit via a corresponding high power connection and a corresponding low power connection such that the common instantaneous tripping unit feeds the plurality of branches at the same time,
wherein the common instantaneous tripping unit interrupts a short circuit fault in an interruption time which is significantly reduced, and
wherein the branch circuit breakers have a low power connection to a gate of the common instantaneous tripping unit which allows each branch circuit breaker to signal the common instantaneous tripping unit to trip.

11. The load center of claim 10 , wherein the common instantaneous tripping unit interrupts the short circuit fault in the interruption time which is in a range of microseconds such as less than 100 microseconds.

12. The load center of claim 10 , wherein an instantaneous tripping happens when the common instantaneous tripping unit receives an instantaneous tripping signal from a branch of the plurality of branches such that the instantaneous tripping signal is provided in response to the short circuit fault.

13. The load center of claim 10 , wherein branch currents are fed by the common instantaneous tripping unit and through each branch circuit breaker of the branch circuit breakers to each branch of the plurality of branches.

14. A load center comprising:
a common instantaneous tripping unit that works on a principle of solid state switching; and
a plurality of branches of branch circuit breakers each of which is coupled to the common instantaneous tripping unit via a corresponding high power connection and a corresponding low power connection such that the common instantaneous tripping unit feeds the plurality of branches at the same time,
wherein the common instantaneous tripping unit interrupts a short circuit fault in an interruption time which is significantly reduced, and
wherein during the short circuit fault once the branch circuit breakers detect the short circuit fault, a tripping signal is sent to a gate of the common instantaneous tripping unit through the low power connection and the common instantaneous tripping unit trips and turns OFF power for all branches it feeds.

15. The load center of claim 14 , wherein the common instantaneous tripping unit interrupts the short circuit fault in the interruption time which is in a range of microseconds such as less than 100 microseconds.

16. The load center of claim 14 , wherein an instantaneous tripping happens when the common instantaneous tripping unit receives an instantaneous tripping signal from a branch of the plurality of branches such that the instantaneous tripping signal is provided in response to the short circuit fault.

17. The load center of claim 14 , wherein branch currents are fed by the common instantaneous tripping unit and through each branch circuit breaker of the branch circuit breakers to each branch of the plurality of branches.

18. The load center of claim 14 , wherein each branch circuit breaker of the branch circuit breakers protects faults other than the short circuit fault on their own such as during an overload, an arc fault or a ground fault the branch circuit breakers open a corresponding branch circuit.

19. The load center of claim 14 , further comprising:
a second common instantaneous tripping unit that feeds a second plurality of branches and only turns OFF power for the second plurality of branches instead of a whole panel.

20. The load center of claim 14 , wherein once tripped, the common instantaneous tripping unit monitors a status of one or more faulty branches such that if a faulty branch clears a short circuit tripping signal through the low power connection, the common instantaneous tripping unit can reset itself.

Assignees

• Siemens Industry Inc

Inventors

• Yang Guang

Classifications

• H02H3/06

  with automatic reconnection · CPC title

• H02H3/033

  with several disconnections in a preferential order, {e.g. following priority of the users, load repartition}(H02H3/06 takes precedence) · CPC title

• H02H5/12

  responsive to undesired approach to, or touching of, live parts by living beings · CPC title

• H02H7/262 Primary

  involving transmissions of switching or blocking orders · CPC title

• H02H1/0061

  concerning transmission of signals (transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26) · CPC title