FI93912C - Electrical connection device current indicating device - Google Patents

Description

The present invention relates to a current detection device for an electrical connection device, which is set out in the preamble of claim 1, and which is intended in particular for plug-in sockets in protective earthed general-purpose power areas, such as extension cords.

Today, the best-known means for detecting protective earthing and electrical currents are test lamps, meters, etc. as separate research devices. Many research equipment requires expertise because of the hazards of electric current.

The German patent publication DE 36 43 702 and the German application publication DE 37 28 749 further disclose a device comprising a lamp connected between the conductors of the socket, which indicates the current of the socket. However, this does not take into account the fact that the functionality of the earthing is also an important safety factor, which is especially important when using many successive extension cords.

The device according to the invention further provides a certified improvement in electrical safety when working at various work sites, e.g. buildings, wet areas and other workplaces.

To achieve this, the device according to the invention is characterized by what is set forth in the characterizing part of claim 1. When the detector of the detection device: is connected between the power cable of the electrical connection device and the earth connection, information is also obtained on the operation of the earthing.

The main advantage of the invention can be considered the absolute certainty of both protective earthing and electric current, both of which simultaneously provide an indication display 40 by means of a detector.

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In the following, the invention will be explained in detail with reference to the accompanying drawing, which shows figures of a 1-pole shielded earthed extension socket.

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FIG. with 20 protective earth detection devices, and Fig. 6 illustrates the need for securing when using successive ground extension cords.

25; Figure 1 shows the principle of a detection device fitted to a protective earthed socket. The device indicates protective earth and current operation. The device thus acts as the functional units connected in parallel to the input line monitor 30 LED lamp 5 is powered by an alternating current input side of the current-carrying wire pair (1 or 2) through. The lamp is connected in parallel to the terminal screws 1, 2 of the socket input cables via a corresponding diode 3, 4 in each branch of the parallel connection. The electrical connection from the LED 35 continues through the protection diode 6 and the subsequent voltage control resistor 7 to the protective earth terminal screw 8. The protection diode is not necessarily necessary in a good electrical network. Diodes 3 and 4 are parallel in discharge direction with respect to lamp 5

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3 93912 and thus prevent the flow of current between the branches. In this way, the semiconductor series connection always gives the indication display live, i.e. the LED lamp 5 is lit. If the protective earth is not intact somewhere at the beginning of the connections 5, the lamp will not light up because the current is blocked.

Figure 2 shows a side view of a protective earthed socket body 9. The body part has the semiconductor components described above attached to the switch plate 10. The body portion also shows the protective contacts li relating to the opposing grounding painohankauksella metallisuojaliuskoihin the plug.

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Figure 3 shows a front view of a switch plate 10 connected to the body part 9 of a protective earthed socket with its semiconductor components.

Fig. 4 shows a housing 12 in which the body part of the socket is placed and in which a transparent indicator light lens 13 is suitably placed at the LED lamp 5 in the body part 9.

Figure 5 shows a protective earthed extension line 14 ·. as a complete structure with a socket 15, a signaling lens 13 therein located at the LED lamp and at one end a plug 16 with metal protective contact strips 17, which plug-30 plugs when connected to the socket 15 according to the invention are connected to the respective protective contacts 11.

Fig. 6 schematically shows the sometimes necessary series extension connection 18 of the protective earth extension conductors 35, in which, thanks to the invention, continuous confirmation of the protective earth is obtained.

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Although the invention has been described above as being adapted to a socket, it could in principle also be applied to a plug. However, for practical reasons, the device is better suited for the socket, because in long connections it is always the outermost part to which the next connection device will be connected.

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Claims (5)

93912 A current detecting device for an electrical connection device, comprising a detector (5) connected to the power line for detecting the current of the connection device, the detector (5) being electrically connected between the current line (1, 2) and the ground connection (8) in the electrical connection device, characterized in (5) is connected in parallel to a pair of wires (1, 2) of an electrical connection device, wherein between the detector (5) and the pair of wires (1, 2) there are means (3, 4) for controlling current between the live wire and the ground connection (8) via the detector (5) . Detection device according to claim 1, characterized in that said control means are diodes (3, 4) in the branches of the parallel connection. Detection device according to one of the preceding claims, characterized in that the detector is 20 LED lamp (5). Detection device according to one of the preceding claims, characterized in that it is arranged in the socket (15). 25 f Detection device according to Claim 4, characterized in that it is arranged in the socket (15) of the extension cable (14). 93912