Integrated electrical panel
The system includes one or more busbars couple to an AC line, branch relays each coupled to a busbar and to a respective circuit breaker, and current sensors each corresponding to at least one respective branch relay of the plurality of branch relays. The system also includes a deadfront arranged in front of the plurality of branch relays, and including openings corresponding to the branch relays allowing an electrical terminal of each branch relay to protrude forward through a respective opening. A circuit breaker is engaged with each respective branch relay, on the deadfront to create an array of branch circuit breakers. The combination of relay and circuit breaker allows each branch circuit to be controllable. The relays may include current sensors, such as a shunt, used to determine a branch circuit current and control the relay. Control circuitry manages the relay on-off operation and monitors branch circuit operation.
1. A system comprising:
a plurality of branch circuits, each respective branch circuit comprising a respective branch relay each comprising a respective first terminal coupled to at least one busbar and a respective second terminal configured to be coupled to a respective circuit breaker; and
a deadfront arranged in front of the plurality of branch relays, the deadfront comprising a plurality of openings corresponding to the plurality of branch relays, wherein:
the second terminal of each branch relay of the plurality of branch relays is configured to protrude forward through a respective opening of the plurality of openings such that the respective circuit breaker is arranged in front of the deadfront when installed.
2. The system of claim 1 , wherein the at least one busbar is configured to be coupled to at least one AC line.
3. The system of claim 1 , wherein each respective branch relay further comprises a respective current sensor configured to sense current in the respective branch circuit.
4. The system of claim 3 , wherein each respective current sensor comprises a respective shunt configured to exhibit a voltage drop in response to a current in the respective branch circuit.
5. The system of claim 1 , further comprising an autotransformer comprising:
at least one primary lead and a neutral lead;
at least one secondary lead; and
at least one autotransformer line relay coupling the at least one secondary lead to the at least one busbar and configured to be closed during islanding and open when the at least one busbar is grid-connected.
6. The system of claim 5 , further comprising at least one autotransformer neutral relay coupling the neutral lead to a neutral bar and configured to be closed during islanding and open when the neutral bar is grid-connected.
7. The system of claim 1 , further comprising:
a main switch configured to be coupled to an at least one AC line and to the at least one busbar; and
a main relay arranged in series with the main switch.
8. The system of claim 1 , further comprising control circuitry coupled to each of the plurality of branch relays, wherein the control circuitry is configured to control an on-off state of each of the plurality of branch relays.
9. The system of claim 8 , further comprising a plurality of current sensors, wherein:
each respective current sensor of the plurality of current sensors is configured to sense a respective current in a respective branch circuit;
each respective current sensor of the plurality of current sensors is configured to generate a respective sensor signal; and
the control circuitry is further configured to receive each respective sensor signal.
10. The system of claim 8 , wherein the control circuitry is further configured to monitor usage of each respective branch circuit.
11. The system of claim 1 , further comprising control circuitry coupled to at least one respective branch relay of the plurality of branch relays, wherein each respective circuit breaker corresponding to the at least one respective branch relay is configured to be coupled to a respective electric load, and wherein the control circuitry is further configured to determine energy information about each respective electric load.
12. The system of claim 1 , wherein:
the at least one busbar comprises at least two busbars;
one respective branch circuit comprises two respective branch relays; and
the two respective branch relays are configured to be coupled to a di-pole circuit breaker.
13. An assembly comprising:
a backing plate configured to be mounted to an electrical enclosure;
a plurality of branch relays installed on the backing plate, each respective branch relay comprising:
a respective first terminal coupled to at least one busbar secured to the backing plate, and
a respective second terminal configured to be coupled to a respective circuit breaker; and
a deadfront arranged to cover the plurality of branch relays with only each respective second terminal of each respective branch relay exposed and configured to be engaged with a respective circuit breaker arranged in front of the deadfront.
14. The assembly of claim 13 , wherein the at least one busbar is configured to be coupled to at least one AC line.
15. The assembly of claim 13 , wherein each respective branch relay further comprises a respective current sensor.
16. The assembly of claim 15 , wherein each respective current sensor comprises a respective shunt configured to exhibit a voltage drop in response to a current flow in the respective relay.
17. The assembly of claim 13 , further comprising one or more neutral bars secured to the deadfront.
18. The assembly of claim 13 , further comprising:
a main breaker configured to be coupled to at least one AC line and to the at least one busbar; and
a main relay arranged in series with the main breaker.
19. The assembly of claim 13 , wherein the deadfront comprises a plurality of openings, each respective opening corresponding to a respective second terminal of a respective branch relay.
20. The assembly of claim 13 , further comprising control circuitry coupled to each of the plurality of branch relays, wherein the control circuitry is configured to control an on-off state of each of the plurality of branch relays.
21. The assembly of claim 13 , wherein:
the at least one busbar comprises at least two busbars;
one respective branch circuit comprises two respective branch relays; and
the two respective branch relays are configured to be coupled to a di-pole circuit breaker.
22. An electrical panel comprising:
an electrical enclosure;
a backing plate configured to be mounted to the electrical enclosure;
a plurality of branch relays installed on the backing plate, each respective branch relay comprising:
a respective first terminal coupled to at least one busbar secured to the backing plate, and
a respective second terminal configured to be coupled to a respective circuit breaker;
a deadfront arranged to cover the plurality of branch relays with only each respective second terminal of each respective branch relay exposed; and
control circuitry coupled to each respective branch relay, wherein the control circuitry is configured to control a throw position of each respective branch relay.
23. The electrical panel of claim 22 , wherein the at least one busbar is configured to be coupled to at least one AC line.
24. The electrical panel of claim 22 , wherein each respective branch relay further comprises a respective current sensor coupled to the control circuitry and configured to transmit a respective sensor signal to the control circuitry.
25. The electrical panel of claim 24 , wherein each respective current sensor comprises a respective shunt configured to exhibit a respective voltage drop in response to a current flow in the respective relay, and wherein the respective sensor signal is indicative of the respective voltage drop.
26. The electrical panel of claim 22 , further comprising one or more neutral bars secured to the deadfront.
27. The electrical panel of claim 26 , further comprising an autotransformer coupled to the at least one busbar by a first relay and coupled to a neutral bar by a second relay.
28. The electrical panel of claim 22 , further comprising:
a main breaker configured to be coupled to at least one AC line and to the at least one busbar; and
a main relay arranged in series with the main breaker, wherein the main relay is coupled to the control circuitry.
29. The electrical panel of claim 22 , wherein the deadfront comprises a plurality of openings, each respective opening corresponding to a respective second terminal of a respective branch relay.
30. The electrical panel of claim 22 , wherein each respective branch relay corresponds to a respective branch circuit, and wherein the control circuitry is further configured to monitor usage of each respective branch circuit.
31. The electrical panel of claim 22 , wherein each respective circuit breaker is configured to be coupled to a respective electric load, and wherein the control circuitry is further configured to determine energy information about each respective electric load.
32. The electrical panel of claim 22 , further comprising an AC-DC converter coupled to the at least one busbar, wherein the AC-DC converter is configured to manage a DC bus.
33. The electrical panel of claim 22 , wherein:
the at least one busbar comprises at least two busbars;
one respective branch circuit comprises two respective branch relays;
the two respective branch relays are configured to be coupled to a di-pole circuit breaker; and
the control circuitry is configured to control the two respective branch relays as a single branch.