REMOTELY UNLOCKABLE ELECTRICAL PANEL

Abstract

A system includes an electrical panel having a high voltage compartment and a low voltage compartment and a first door shiftable between an open position allowing access to the high voltage compartment and a closed position preventing access to the high voltage compartment and a lock shiftable from a locked position to an unlocked position by an actuator in response to a receipt of an unlock signal. A main disconnect switch outside the electrical panel selectively connects a source of electric current to the electrical panel, and a sensor detects a position of the main disconnect switch and sends an unlock signal to the first actuator in response to a detection that the main disconnect switch is in an OFF position.

Claims

1. A system comprising: a first electrical panel having a high voltage compartment and a low voltage compartment and a first door shiftable between an open position allowing access to the high voltage compartment and a closed position preventing access to the high voltage compartment; a first lock shiftable between a locked position locking the first door and an unlocked position unlocking the first door; a first actuator configured to shift the first lock from the locked position to the unlocked position in response to a receipt of an unlock signal; a main disconnect switch outside the first electrical panel shiftable between an ON position for connecting a source of electric current to the first electrical panel and an OFF position for disconnecting the source of electric current from the first electrical panel; and a sensor configured to detect a position of the main disconnect switch and to send the unlock signal to the first actuator in response to a detection that the main disconnect switch is in the OFF position.

2. The system of claim 1, including: a second electrical panel having a high voltage compartment and a low voltage compartment and a second door shiftable between an open position allowing access to the high voltage compartment of the second electrical panel and a closed position preventing access to the high voltage compartment of the second electrical panel; a second lock shiftable between a locked position locking the second door and an unlocked position unlocking the second door; and a second actuator in communication with the sensor and configured to shift the second lock from the locked position to the unlocked position in response to the receipt of the unlock signal.

3. The system of claim 2, wherein the unlock signal are transmitted wirelessly to the first actuator and to the second actuator.

4. The system of claim 2, including a first wire connecting the sensor to the first actuator and a second wire connecting the sensor to the second actuator and wherein the unlock signal is transmitted over the first wire and over the second wire.

5. The system of claim 2, wherein the first electrical panel has a third door shiftable between an open position allowing access to the low voltage compartment and a closed position preventing access to the low voltage compartment, the third door being operable independently of the first door.

6. The system of claim 2, wherein the first actuator comprises a solenoid.

7. The system of claim 6, wherein the sensor includes an element configured to be physically moved by the main disconnect switch when the main disconnect switch shifts to the OFF position.

8. The system of claim 6, wherein the first lock includes a bolt that extends into an opening in the first door when the first lock is in the locked position.

9. The system of claim 2, wherein the sensor is configured to send a lock signal to the first actuator in response to a detection that the main disconnect switch is in the ON position.

10. A method comprising: providing at least one electrical panel, the at least one electrical panel including a first electrical panel having a high voltage compartment and a low voltage compartment and a first door shiftable between an open position allowing access to the high voltage compartment of the first electrical panel and a closed position preventing access to the high voltage compartment of the first electrical panel; providing a first lock shiftable between a locked position locking the first door of the first electrical panel and an unlocked position unlocking the first door of the first electrical panel; providing a first actuator configured to shift the first lock from the locked position to the unlocked position in response to a receipt of an unlock signal; providing a main disconnect switch outside the at least one electrical panel shiftable between an ON position for connecting a source of electric current to the high voltage compartment of the first electrical panel and an OFF position for disconnecting the source of electric current from the high voltage compartment of the first electrical panel; detecting a position of the main disconnect switch; and sending the unlock signal to the actuator in response to a detection that the main disconnect switch is in the OFF position.

11. The method of claim 10, wherein the at least one electrical panel includes a second electrical panel having a high voltage compartment and a low voltage compartment and a second door shiftable between an open position allowing access to the high voltage compartment of the second electrical panel and a closed position preventing access to the high voltage compartment of the second electrical panel; the system including a second lock shiftable between a locked position locking the second door and an unlocked position unlocking the second door; and a second actuator configured to shift the second lock from the locked position to the unlocked position in response to the receipt of the unlock signal and, the method further including shifting the second lock from the locked position to the unlocked position in response to the receipt of the unlock signal.

12. The method of claim 11 including transmitting the unlock signal wirelessly.

13. The method of claim 11 including transmitting the unlock signal over a wire.

14. The method of claim 11, wherein the first electrical panel has a third door shiftable between an open position allowing access to the low voltage compartment and a closed position preventing access to the low voltage compartment, the method including opening the third door when the first lock is in the locked position.

15. The method of claim 14, including pressing a portion of the main disconnect switch against the sensor to generate the unlock signal.

16. A system comprising: a first electrical panel having a high voltage compartment and a low voltage compartment and a first door shiftable between an open position allowing access to the high voltage compartment and a closed position preventing access to the high voltage compartment; a main disconnect switch outside the first electrical panel shiftable between an ON position for connecting a source of electric current to the high voltage compartment of the first electrical panel and an OFF position for disconnecting the source of electric current from the high voltage compartment of the first electrical panel; and means for selectably unlocking he first door based on a detected position of the main disconnect switch.

17. The system of claim 16, wherein the means for selectively unlocking comprises an actuator for shifting a bolt of the lock between an extended position and a retracted position in response to a receipt of an unlock signal and a sensor for detecting the position of the main disconnect switch.

18. The system of claim 17, wherein the unlock signal is transmitted wirelessly or electrically over a wire.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 schematically illustrates a conventional electrical panel, shown in top plan view, connected to a conventional main disconnect switch, shown in side elevational view, with the main disconnect switch in the ON position and the high voltage door of the electrical panel locked.

[0020] FIG. 2 shows the electrical panel of FIG. 1 with the main disconnect switch in the OFF position and the high voltage door unlocked and open.

[0021] FIG. 3 schematically illustrates a system according to an embodiment of the present disclosure that includes an electrical panel, shown in top plan view, and a main disconnect switch, shown in side elevational view, and a solenoid for selectively locking the high voltage door of the electrical panel.

[0022] FIG. 4 schematically illustrates a system according to another embodiment of the present disclosure that includes a main electrical panel and a subpanel, each shown in top plan view, and a main disconnect switch, shown in side elevational view, and a solenoid for selectively locking the high voltage door of each panel.

[0023] FIG. 5 schematically illustrates a system according to another embodiment of the present disclosure that includes a main electrical panel and a subpanel, each shown in top plan view, and a main disconnect switch, shown in side elevational view, and a solenoid for selectively locking the high voltage door of the subpanel.

DETAILED DESCRIPTION

[0024] Referring now to the drawings, wherein the showings are for purposes of illustrating embodiments of the present disclosure only and not for the purpose of limiting same, FIG. 3 shows a main electrical panel 30 having a low voltage side 32 (or L) protected by a door 33 (a low voltage door) and a high-voltage side 34 (or H) protected by a door 36 (a high-voltage door). The descriptions high voltage and low voltage identify the location of the doors and not any particular voltage at which the doors themselves are maintained. The high voltage door 36 includes an opening 38 and can be locked by extending a bolt 40 through the opening 38 and unlocked by retracting the bolt 40. As will be appreciated from the positions of the bolt 40 and the opening 38 in the high voltage door 36 of FIG. 4, the bolt 40 cannot be inserted through the opening 38 in the high voltage door 36 when the high voltage door 36 is open.

[0025] The bolt 40 is controlled by a solenoid 42 which shifts the bolt 40 between an extended position and a retracted position in response to a signal received over a wire 44 or wirelessly by a receiver 46. While both a wire 44 and a receiver 46 are illustrated, in general, embodiments will communicate by only one of these methods.

[0026] The solenoid 42 is controlled by a controller 48 in a main disconnect panel 50 which controller 48 is either connected to the wire 44 to send signals over the wire 44 to the solenoid 42 or includes a transmitter 52 to transmit signals to the receiver 46 of the solenoid 42. The controller 48 may be as simple as a conventional switch that supplies current to the solenoid 42 to retract the bolt 40 when a physical button (e.g., element 60) is pushed or may comprise a microprocessor or microcontroller (not illustrated) that controls a current flow in response to signal inputs.

[0027] The main disconnect panel 50 includes a first mechanical switch 54 that functions to both selectively open and close an electrical switch 56 that connects a source 58 of electrical current to the high voltage side 34 of the main electrical panel 30 and to selectively actuate a second mechanical switch 60 on the controller 48 to send a signal to the solenoid 42. Instead of a second mechanical switch, the main disconnect panel 50 may be provided with a different sensor, optical or magnetic, for example, for detecting the position of the first mechanical switch and generating a signal in response thereto.

[0028] The first mechanical switch 54 is shown in the ON position in the main disconnect panel 50 in FIG. 3 and in the OFF position in the main disconnect panel 50 of FIG. 4. In the ON position, the first mechanical switch 54 holds the electrical switch 56 closed and does not engage the second mechanical switch 60. In this configuration, the source 58 is electrically connected to the main electrical panel 30 and the bolt 40 extends through the opening 38 in the high voltage door 36 to lock the high voltage door 36. When the first mechanical switch 54 is shifted to the OFF position, as shown in FIG. 4, it releases the electrical switch 56 allowing it to open and break the electrical circuit and presses against the second mechanical switch 60 to actuate the solenoid 42 and retract the bolt 40. In this configuration, the source 58 is electrically disconnected from the main electrical panel 30 and the high voltage door 36 is unlocked and can be opened. In this embodiment, the electrical switch 56 is spring biased toward an open position; in other embodiments, the first mechanical switch could be configured to physically move the electrical switch between the open and closed positions. Furthermore, in the present embodiment, the solenoid 42 leaves the bolt 40 in the extended position when no power is applied, and a voltage signal is applied to the solenoid 42 to retract the bolt 40. However, it is also possible to apply a voltage to the solenoid 42 to maintain the bolt 40 in the extended position. Thus the signal that causes the solenoid 42 to shift the bolt 40 can be either a positive (or negative) voltage or a 0 voltage. That is, the signal that actuates the solenoid can be a shift from one voltage level to another, including a level of 0 volts.

[0029] Because the locking of the high-voltage door 36 is accomplished via electrical signals instead of via a direct mechanical link, it is no longer necessary to locate the main disconnect panel 50 in close proximity to the main electrical panel 30. Furthermore, as illustrated in FIG. 4, the first mechanical switch 54 of a single main disconnect panel 50 can be used to electrically control more than one solenoid, for example, the solenoid 42 of the main electrical panel 30 and a solenoid 42 of a subpanel 62. Thus it is no longer necessary to turn off every electrical disconnect panel at every subpanel before working on those subpanels since the high voltage panels of the subpanels are unlocked automatically when power is disconnected from the main disconnect panel.

[0030] In addition, as illustrated in FIG. 5, a conventional bolt 20 can be used to lock and unlock the high voltage door 14 of a conventional main electrical panel 10 while the first mechanical switch 54 can actuate the controller 48 to control a solenoid 42 in one or more subpanels 62.

[0031] Different methods exist for preventing the main disconnect switch from being returned to the ON position while the high voltage doors of the subpanels are open. These include standard procedures like padlocking the main disconnect switch until the state of all the doors of the subpanels can be verified. However, it is also possible for the solenoids to provide feedback to the main disconnect panel. For example, the high voltage door 36 of the subpanel 62 illustrated in FIG. 4 is open, and it will be appreciated from this figure that the bolt 40 cannot move into the opening 38 in the high voltage door 36 because the opening 38 is not aligned with the bolt 40. The solenoid 42 or a sensor (not illustrated) associated therewith can be configured to send a signal indicating that the bolt 38 cannot be extended which can be interpreted as an indication that the high voltage door 36 of a given subpanel 62 is not properly closed. Such feedback with or without conventional safeguards could be used to help ensure that all high-voltage doors are locked before restoring power to the system.

[0032] The present invention has been described above in terms of embodiments. Modifications and additions to these embodiments will become apparent to persons of ordinary skill in the art upon a reading of the foregoing disclosure. It is intended that all such modifications comprise a part of the present invention.