WO2002035661A1 - Electrical power outlet - Google Patents

Electrical power outlet Download PDF

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Publication number
WO2002035661A1
WO2002035661A1 PCT/IB2001/001987 IB0101987W WO0235661A1 WO 2002035661 A1 WO2002035661 A1 WO 2002035661A1 IB 0101987 W IB0101987 W IB 0101987W WO 0235661 A1 WO0235661 A1 WO 0235661A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
power
socket
plug
interrupting device
Prior art date
Application number
PCT/IB2001/001987
Other languages
French (fr)
Inventor
Mark Macdonald
Original Assignee
Mark Macdonald
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mark Macdonald filed Critical Mark Macdonald
Priority to AU2002212569A priority Critical patent/AU2002212569A1/en
Publication of WO2002035661A1 publication Critical patent/WO2002035661A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
    • H01R13/7135—Structural association with built-in electrical component with built-in switch the switch being a safety switch with ground fault protector

Definitions

  • This invention relates to an electrical power outlet.
  • Certain electrical power outlets have a mechanical interlock which permits power to be supplied to the outlet only when a plug is plugged into the outlet. Such power outlets are relatively expensive and the mechanical interlock is subject to wear.
  • an electrical power outlet includes a socket for receiving a plug, a first switch associated with the socket so that the switch can be switched by the insertion or removal of the plug from the socket, and a power interrupting device for interrupting the supply of power to the socket, so that when the plug is removed from the socket, the first switch switches and causes the power interrupting device to interrupt the supply of power to the socket through the power interrupting device.
  • the electrical power outlet preferably includes a second switch associated with the power interrupting device, the second switch being electrically connected to the first switch so that switching of the first switch upon removal of the plug from the socket causes the second switch to switch and cause the power interrupting device to interrupt the supply of power to the socket.
  • the power interrupting device preferably includes a switching mechanism mechanically connected to a switching mechanism of the second switch by a mechanical connection so that when the switching mechanism of the second switch switches, when the plug is removed from the socket, the mechanical connection causes the switching mechanism of the power interrupting device to switch thereby to interrupt the supply of power to the socket.
  • the first switch is preferably a normally closed switch.
  • the second switch may be a shunt trip or a no-volt coil.
  • the power interrupting device may be a circuit breaker, isolator, earth leakage circuit breaker or a residual current device.
  • the power interrupting device is an earth leakage circuit breaker and the first switch, when closed, causes current to flow to earth or a neutral phase and thereby causes the earth leakage circuit breaker to trip and interrupt the supply of power to the socket.
  • the power interrupting device is a residual current device and wherein the first switch, when closed, causes current to flow to a neutral phase and thereby causes the residual current device to trip and interrupt the supply of power to the socket.
  • a method of controlling the supply of electrical power to a power outlet includes the step of switching a first switch by the removal of a plug from the power outlet, the first switch being electrically connected to a second switch associated with a power interrupting device, the switching of the first switch by the removal of the plug from the power outlet causing the second switch to switch and thereby interrupt the supply of power to the socket through the power interrupting device.
  • the method of preferably includes the step of inserting the plug into the outlet to switch the first switch so that the power interrupting device can be reset to supply power to the power outlet.
  • Figure 1 is a diagrammatic perspective view of an electrical power outlet according to a first embodiment of the invention
  • Figure 2 is a circuit diagram of the electrical power outlet of figure 1 ;
  • Figure 3 is a diagrammatic perspective view of an electrical power outlet according to a second embodiment of the invention.
  • Figure 4 is a circuit diagram of an electrical power outlet according to a third embodiment of the invention.
  • Figure 5 is a side view of an electrical power outlet according to a fourth embodiment of the invention.
  • Figure 6 is a plan view of the electrical power outlet of figure 5 in an open position;
  • Figure 7 is a circuit diagram of the electrical power outlet of figures 5 and 6.
  • an electrical power outlet 10 includes a socket 12 for a plug 14.
  • the socket 12 has three live phase pin sockets 16 and one earth pin socket 17.
  • the live phase pin sockets 16 are connected by wires 19 to an earth leakage circuit breaker 18.
  • the earth pin socket 17 is connected by a wire 20 to an earth terminal 22.
  • a normally closed first switch 24 is mounted below the socket 12 so that it can be switched by a lug 26 on the plug 14.
  • the switch 24 is connected to one of the live phases by a wire 28 via a bank of resistors 30, and to the earth terminal 22 by a wire 32.
  • the switch 24 has an arm 34 which is biased away from the body of the switch 24.
  • an electrical power outlet 10.1 includes a socket 12.1 for a plug 14.1.
  • the socket has three live phase pin sockets 16.1 and one earth pin socket 17.1.
  • the live phase pin sockets 16.1 are connected by wires 19.1 to an earth leakage circuit breaker 18.1.
  • the earth pin socket 17.1 is connected by a wire 20.1 to an earth terminal 22.1.
  • a normally closed first switch 24.1 is mounted below the socket so that it can be switched by a lug 26.1 on the plug 14.1.
  • the one end of the switch 24.1 is electrically connected to a live phase by a wire 28.1.
  • the other end of the switch is electrically connected by a wire 29.1 to one end of a second switch in the form of a shunt trip 30.1 which has a switching mechanism (not shown).
  • This switching mechanism is mechanically connected via a mechanical connection (not shown) to a switching mechanism of the earth leakage circuit breaker 18.1.
  • the other end of the shunt trip 30.1 is electrically connected to another live phase by a wire 32.1.
  • the lug 26.1 depresses an arm 34.1 of the switch 24.1 and opens the switch 24.1. This prevents the flow of current through the shunt trip 30.1.
  • the earth leakage circuit breaker 18.1 which was hitherto in an open position, can then be closed to supply power to the socket 12.1.
  • the switch 24.1 closes as the arm 34.1 moves away from the body of the switch 24.1.
  • the closed switch 24.1 allows current to flow through the shunt trip 30.1 which trips the earth leakage circuit breaker 18.1 via the mechanical connection between the two switching mechanisms.
  • a test trip circuit of the earth leakage circuit breaker (not shown) has a trip button 40.1.
  • the trip button 40.1 When the trip button 40.1 is depressed it closes a circuit between a live phase 42.1 and an earth 44.1 by bridging two contacts 46.1.
  • a resistor or current limiting device 48.1 is provided between the earth 44.1 and the live phase 42.1.
  • the circuit When the circuit is closed, current flows between the live phase 42.1 and the earth 44.1 which results in the tripping of the earth leakage circuit breaker.
  • the contacts 46.1 are connected to terminals 48.1 which are externally accessible on the housing or body of the earth leakage circuit breaker.
  • This earth leakage circuit breaker is located in the electrical power outlet 10.1 shown in figure 3 in place of the earth leakage circuit breaker 18.1 and the shunt trip 30.1.
  • the switch 24.1 is connected to the terminals 48.1 as shown in figure 3.
  • the switch 24.1 closes. This causes current to flow between the live phase 42.1 and earth 44.1 resulting in tripping of the earth leakage circuit breaker.
  • the test trip circuit of the earth leakage circuit breaker is used to provide an electrical interlock for the electrical power outlet 10.1.
  • the resistor 48.1 is rated to withstand repeated tripping of the earth leakage circuit breaker resulting from closure of the switch 24.1.
  • an electrical power outlet 50 includes a box 52 consisting of a bottom section 54 and top section 56.
  • the bottom section 54 contains a shunt trip 58, circuit breaker 60 and an earth leakage device 62 known as a "Vigi" unit. "Vigi” is a brand name of Merlin Gerin.
  • the circuit breaker 60 and the earth leakage device 62 together comprise an earth leakage circuit breaker.
  • the shunt trip 58 has a switching mechanism 64 which is mechanically connected to a switching mechanism 66 of the circuit breaker 60 by a lug 67 projecting from the switching mechanism 64 into the switching mechanism 66.
  • the upper section 56 of the box 52 contains a socket 68 for a plug 70.
  • a first normally closed switch 72 is mounted adjacent the socket 68 where it can be switched by a lug 26 on the plug 70.
  • the upper section 56 also contains a window 74 through which the shunt trip 58, circuit breaker 60 and earth leakage device 62 can be inspected and accessed.
  • the earth leakage device 62 is electrically connected to the socket 68 by three phase wires 76 and a neutral wire 78.
  • An earth wire 80 is also provided.
  • One of the sides of the switch 72 is electrically connected by a wire 82 to one of the phases of the earth leakage device 62.
  • the other of the sides of the switch 72 is electrically connected by a wire 84 to the shunt trip 58.
  • the shunt trip 58 is connected to another phase of the earth leakage device 62 by a wire 86.
  • the normally closed switch 72 opens and interrupts the flow of current to the shunt trip 58. This causes the shunt trip 58 to trip. Because the switching mechanism 64 of the shunt trip 58 is mechanically linked to the switching mechanism 66 of the circuit breaker 60, the circuit breaker 60 also trips and interrupts the supply of power to the socket 68.
  • the lug 26 on the plug 70 switches the switch 72 to its closed position thereby supplying current to the shunt trip 58.
  • the switching mechanism 66 of the circuit breaker 60 can then be physically reset to its on position via the window 74 to supply power to the socket 68.

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  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

An electrical power outlet includes a socket for receiving a plug, a first switch associated with the socket so that the switch can be switched by the insertion or removal of the plug from the socket, and a power interrupting device for interrupting the supply of power to the socket so that when the plug is removed from the socket, the first switch switches and causes the power interrupting device to interrupt the supply of power to the socket through the power interrupting device.

Description

ELECTRICAL POWER OUTLET
FIELD OF THE INVENTION
This invention relates to an electrical power outlet.
BACKGROUND OF THE INVENTION
Certain electrical power outlets have a mechanical interlock which permits power to be supplied to the outlet only when a plug is plugged into the outlet. Such power outlets are relatively expensive and the mechanical interlock is subject to wear.
SUMMARY OF THE INVENTION
According to the invention an electrical power outlet includes a socket for receiving a plug, a first switch associated with the socket so that the switch can be switched by the insertion or removal of the plug from the socket, and a power interrupting device for interrupting the supply of power to the socket, so that when the plug is removed from the socket, the first switch switches and causes the power interrupting device to interrupt the supply of power to the socket through the power interrupting device.
The electrical power outlet preferably includes a second switch associated with the power interrupting device, the second switch being electrically connected to the first switch so that switching of the first switch upon removal of the plug from the socket causes the second switch to switch and cause the power interrupting device to interrupt the supply of power to the socket.
The power interrupting device preferably includes a switching mechanism mechanically connected to a switching mechanism of the second switch by a mechanical connection so that when the switching mechanism of the second switch switches, when the plug is removed from the socket, the mechanical connection causes the switching mechanism of the power interrupting device to switch thereby to interrupt the supply of power to the socket.
The first switch is preferably a normally closed switch.
The second switch may be a shunt trip or a no-volt coil.
The power interrupting device may be a circuit breaker, isolator, earth leakage circuit breaker or a residual current device.
In one form of the invention the power interrupting device is an earth leakage circuit breaker and the first switch, when closed, causes current to flow to earth or a neutral phase and thereby causes the earth leakage circuit breaker to trip and interrupt the supply of power to the socket.
In another form of the invention the power interrupting device is a residual current device and wherein the first switch, when closed, causes current to flow to a neutral phase and thereby causes the residual current device to trip and interrupt the supply of power to the socket. According to another aspect of the invention a method of controlling the supply of electrical power to a power outlet includes the step of switching a first switch by the removal of a plug from the power outlet, the first switch being electrically connected to a second switch associated with a power interrupting device, the switching of the first switch by the removal of the plug from the power outlet causing the second switch to switch and thereby interrupt the supply of power to the socket through the power interrupting device.
The method of preferably includes the step of inserting the plug into the outlet to switch the first switch so that the power interrupting device can be reset to supply power to the power outlet.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a diagrammatic perspective view of an electrical power outlet according to a first embodiment of the invention;
Figure 2 is a circuit diagram of the electrical power outlet of figure 1 ;
Figure 3 is a diagrammatic perspective view of an electrical power outlet according to a second embodiment of the invention;
Figure 4 is a circuit diagram of an electrical power outlet according to a third embodiment of the invention;
Figure 5 is a side view of an electrical power outlet according to a fourth embodiment of the invention; Figure 6 is a plan view of the electrical power outlet of figure 5 in an open position; and
Figure 7 is a circuit diagram of the electrical power outlet of figures 5 and 6.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring firstly to figures 1 and 2, an electrical power outlet 10 includes a socket 12 for a plug 14. The socket 12 has three live phase pin sockets 16 and one earth pin socket 17. The live phase pin sockets 16 are connected by wires 19 to an earth leakage circuit breaker 18. The earth pin socket 17 is connected by a wire 20 to an earth terminal 22.
A normally closed first switch 24 is mounted below the socket 12 so that it can be switched by a lug 26 on the plug 14. The switch 24 is connected to one of the live phases by a wire 28 via a bank of resistors 30, and to the earth terminal 22 by a wire 32. The switch 24 has an arm 34 which is biased away from the body of the switch 24.
In use, when the plug 14 is inserted into the socket 12, the lug 26 depresses the arm 34 and opens the switch preventing the flow of current between the live phase and earth. The circuit breaker 18, which was hitherto in an open position, can then be closed to supply power to the socket 12. When the plug 14 is withdrawn from the socket 12, the switch 24 closes as the arm 34 moves away from the body of the switch 24. The closed switch 24 allows current to flow between the live phase and earth. This current flow causes the earth leakage circuit breaker 18 to trip, thereby interrupting the supply of electricity to the socket 12. Referring now to figure 3, an electrical power outlet 10.1 includes a socket 12.1 for a plug 14.1. The socket has three live phase pin sockets 16.1 and one earth pin socket 17.1. The live phase pin sockets 16.1 are connected by wires 19.1 to an earth leakage circuit breaker 18.1. The earth pin socket 17.1 is connected by a wire 20.1 to an earth terminal 22.1.
A normally closed first switch 24.1 is mounted below the socket so that it can be switched by a lug 26.1 on the plug 14.1. The one end of the switch 24.1 is electrically connected to a live phase by a wire 28.1. The other end of the switch is electrically connected by a wire 29.1 to one end of a second switch in the form of a shunt trip 30.1 which has a switching mechanism (not shown). This switching mechanism is mechanically connected via a mechanical connection (not shown) to a switching mechanism of the earth leakage circuit breaker 18.1. The other end of the shunt trip 30.1 is electrically connected to another live phase by a wire 32.1.
In use, when the plug 14.1 is inserted into the socket 12.1 , the lug 26.1 depresses an arm 34.1 of the switch 24.1 and opens the switch 24.1. This prevents the flow of current through the shunt trip 30.1. The earth leakage circuit breaker 18.1 , which was hitherto in an open position, can then be closed to supply power to the socket 12.1. When the plug 14.1 is withdrawn from the socket 12.1 , the switch 24.1 closes as the arm 34.1 moves away from the body of the switch 24.1. The closed switch 24.1 allows current to flow through the shunt trip 30.1 which trips the earth leakage circuit breaker 18.1 via the mechanical connection between the two switching mechanisms.
Referring now to figure 4, a test trip circuit of the earth leakage circuit breaker (not shown) has a trip button 40.1. When the trip button 40.1 is depressed it closes a circuit between a live phase 42.1 and an earth 44.1 by bridging two contacts 46.1. A resistor or current limiting device 48.1 is provided between the earth 44.1 and the live phase 42.1. When the circuit is closed, current flows between the live phase 42.1 and the earth 44.1 which results in the tripping of the earth leakage circuit breaker.
The contacts 46.1 are connected to terminals 48.1 which are externally accessible on the housing or body of the earth leakage circuit breaker. This earth leakage circuit breaker is located in the electrical power outlet 10.1 shown in figure 3 in place of the earth leakage circuit breaker 18.1 and the shunt trip 30.1. The switch 24.1 is connected to the terminals 48.1 as shown in figure 3.
In use, when the plug 14.1 is withdrawn from the socket 12.1, the switch 24.1 closes. This causes current to flow between the live phase 42.1 and earth 44.1 resulting in tripping of the earth leakage circuit breaker. Thus the test trip circuit of the earth leakage circuit breaker is used to provide an electrical interlock for the electrical power outlet 10.1. The resistor 48.1 is rated to withstand repeated tripping of the earth leakage circuit breaker resulting from closure of the switch 24.1.
Referring now to figures 5 to 7, an electrical power outlet 50 includes a box 52 consisting of a bottom section 54 and top section 56.
The bottom section 54 contains a shunt trip 58, circuit breaker 60 and an earth leakage device 62 known as a "Vigi" unit. "Vigi" is a brand name of Merlin Gerin. The circuit breaker 60 and the earth leakage device 62 together comprise an earth leakage circuit breaker.
The shunt trip 58 has a switching mechanism 64 which is mechanically connected to a switching mechanism 66 of the circuit breaker 60 by a lug 67 projecting from the switching mechanism 64 into the switching mechanism 66.
The upper section 56 of the box 52 contains a socket 68 for a plug 70. A first normally closed switch 72 is mounted adjacent the socket 68 where it can be switched by a lug 26 on the plug 70. The upper section 56 also contains a window 74 through which the shunt trip 58, circuit breaker 60 and earth leakage device 62 can be inspected and accessed.
The earth leakage device 62 is electrically connected to the socket 68 by three phase wires 76 and a neutral wire 78. An earth wire 80 is also provided. One of the sides of the switch 72 is electrically connected by a wire 82 to one of the phases of the earth leakage device 62. The other of the sides of the switch 72 is electrically connected by a wire 84 to the shunt trip 58. The shunt trip 58 is connected to another phase of the earth leakage device 62 by a wire 86.
In use, when the plug 70 is removed from the socket 68, the normally closed switch 72 opens and interrupts the flow of current to the shunt trip 58. This causes the shunt trip 58 to trip. Because the switching mechanism 64 of the shunt trip 58 is mechanically linked to the switching mechanism 66 of the circuit breaker 60, the circuit breaker 60 also trips and interrupts the supply of power to the socket 68. When the plug 70 is inserted into the socket 68, the lug 26 on the plug 70 switches the switch 72 to its closed position thereby supplying current to the shunt trip 58. The switching mechanism 66 of the circuit breaker 60 can then be physically reset to its on position via the window 74 to supply power to the socket 68.
It will be appreciated that many modifications or variations of the invention are possible without departing from the spirit or scope of the invention.

Claims

1. An electrical power outlet including a socket for receiving a plug, a first switch associated with the socket so that the switch can be switched by the insertion or removal of the plug from the socket, and a power interrupting device for interrupting the supply of power to the socket so that when the plug is removed from the socket, the first switch switches and causes the power interrupting device to interrupt the supply of power to the socket through the power interrupting device.
2. The electrical power outlet of claim 1 including a second switch associated with the power interrupting device, the second switch being electrically connected to the first switch so that switching of the first switch upon removal of the plug from the socket causes the second switch to switch and cause the power interrupting device to interrupt the supply of power to the socket.
3. The electrical power outlet of claim 2 wherein the power interrupting device includes a switching mechanism mechanically connected to a switching mechanism of the second switch by a mechanical connection so that when the switching mechanism of the second switch switches, when the plug is removed from the socket, the mechanical connection causes the switching mechanism of the power interrupting device to switch thereby to interrupt the supply of power to the socket.
4. The electrical power outlet of any one of the above claims wherein the first switch is a normally closed switch.
5. The electrical power outlet of any one of claims 2 to 4 wherein the second switch is a shunt trip or a no-volt coil.
6. The electrical power outlet of any one of claims 1 to 5 wherein the power interrupting device is a circuit breaker, isolator, earth leakage circuit breaker or a residual current device.
7. The electrical power outlet of claim 6 wherein the power interrupting device is an earth leakage circuit breaker and the first switch, when closed, causes current to flow to earth or a neutral phase and thereby causes the earth leakage circuit breaker to trip and interrupt the supply of power to the socket.
8. The electrical power outlet of claim 6 wherein the power interrupting device is a residual current device and wherein the first switch, when closed, causes current to flow to a neutral phase and thereby causes the residual current device to trip and interrupt the supply of power to the socket.
9. A method of controlling the supply of electrical power to a power outlet including the step of switching a first switch by the removal of a plug from the power outlet, the first switch being electrically connected to a second switch associated with a power interrupting device, the switching of the first switch by the removal of the plug from the power outlet causing the second switch to switch and thereby interrupt the supply of power to the socket through the power interrupting device.
10. The method of claim 9 including the step of inserting the plug into the outlet to switch the first switch so that the power interrupting device can be reset to supply power to the power outlet.
11. An electrical power outlet substantially as herein described and illustrated with reference to the accompanying drawings.
12. A method of controlling the supply of electrical power to an electrical power outlet substantially as herein described and illustrated with reference to the accompanying drawings.
PCT/IB2001/001987 2000-10-24 2001-10-24 Electrical power outlet WO2002035661A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002212569A AU2002212569A1 (en) 2000-10-24 2001-10-24 Electrical power outlet

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA200005948 2000-10-24
ZA2000/5948 2000-10-24
ZA2000/6526 2000-11-10
ZA200006526 2000-11-10

Publications (1)

Publication Number Publication Date
WO2002035661A1 true WO2002035661A1 (en) 2002-05-02

Family

ID=27145535

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/001987 WO2002035661A1 (en) 2000-10-24 2001-10-24 Electrical power outlet

Country Status (2)

Country Link
AU (1) AU2002212569A1 (en)
WO (1) WO2002035661A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002951A (en) * 1975-09-22 1977-01-11 Cutler-Hammer, Inc. Electrical receptacle mounted ground fault interrupter with automatic plug insertion testing
EP0258198A2 (en) * 1986-08-29 1988-03-02 Flymo Limited Electrical safety device
GB2214734A (en) * 1988-01-29 1989-09-06 B & R Electrical Prod Ltd Residual current circuit breaker
GB2266015A (en) * 1992-04-03 1993-10-13 Mk Electric Ltd Switched electrical socket outlet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002951A (en) * 1975-09-22 1977-01-11 Cutler-Hammer, Inc. Electrical receptacle mounted ground fault interrupter with automatic plug insertion testing
EP0258198A2 (en) * 1986-08-29 1988-03-02 Flymo Limited Electrical safety device
GB2214734A (en) * 1988-01-29 1989-09-06 B & R Electrical Prod Ltd Residual current circuit breaker
GB2266015A (en) * 1992-04-03 1993-10-13 Mk Electric Ltd Switched electrical socket outlet

Also Published As

Publication number Publication date
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