DE1613706A1 - Device for short-circuiting the secondary circuit of a current transformer - Google Patents

Description

Device for short soling the secondary circuit of a current transformer

When switching off electrical devices that are directly on connected to a current transformer, "there is a risk that the secondary circuit of the current transformer will be unintentionally is opened. This is particularly true when using plug-in devices, e.g. relays with connector pins. Normally are manually operated changeover switches with interruption-free Contacts for short-circuiting the secondary circuit of the current transformer, which must be actuated before the apparatus is dared to be removed from its mounting plate. Since the switch is operated by hand, there is always the risk of an interruption of the secondary circuit and damage to the current transformer.

With a device according to the invention, the secondary circuit is automatically short-circuited when the device is removed obtain. The short circuit takes place before the device is removed from the secondary circuit, so that each Danger to the current transformer is excluded.

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109822/0151

The main feature of the invention is that the connector from an insulated base with "attached" herein Sleeve contacts for receiving the connector pins in the secondary circuit The device to be switched on consists of the current transformer and a socket in a cavity of the insulating base against a spring between two positions -shiftable contact bracket, which in one position the sleeve contacts electrically connects with each other and brought into a second end position by a pin attached to the device to be inserted can be in which he no longer connects the sleeve contacts with each other.

The mentioned contact bracket consists of a roof-shaped bent sheet metal strip with hook-shaped bent ends, - through the on the contact clip acting spring against the contact sleeves and against surfaces of a web are printed, which the Contact clip receiving opening of the base closes down. There is also a guide and actuation pin on the contact bracket attached of such a length that the connection of the two sleeve contacts is only canceled after the The connector pins of the device are inserted into the sleeve contacts.

One embodiment of the invention as applied to a plug-in type relay is described below with reference to the drawing.

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1098 2 2/0151

In the drawing shows Pig. 1 a mounting plate 1. This plate has round recesses 23 that face the rear the plate are open and closed on the front apart from the openings 24 and 25. In the recess 23 sits a round base 2 made of insulating material with a collar 26, which is used to attach the base. The base has two through bores 11. Two sleeve contacts 9 »for receiving the connector pins 21 are fastened here of the device marked 20, e.g. a relay, of which only the base plate is shown in section.

The base 2 has a funnel-shaped recess 3 of rectangular Floor plan that merges into a chamber 3a at its top. In the recess 3 sits a roof-shaped curved Contact bracket 4, the web of which is denoted by 5. The ends 8 of the contact clip are bent in a semicircle and support on a web 27 which is fastened in the base 2. The support surfaces on the web are denoted by 10. On the A spring 6 acts on the web 5, the other end of which is supported on the bottom of the chamber 3a. This spring presses the contact ends 8 against the contact sleeves 11, i.e. the spring 4 short-circuits the two sleeve contacts 11. With the ends 12 of these Sleeve contacts are soldered lines 13 to the secondary terminals of the current transformer.

A pin 14 is attached to the web 5 of the contact 4. He protrudes into an opening 28 of the web 27, the same with the Opening 25 is. At the bottom of the device 20 is a pin 22

-4-10 98 ?? / 0151

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attached, which moves the pin 14 against the spring force 6 when the sockets 21 are inserted. Thereby the contact 4 pushed into the recess 3, the contact ends 8 separate from the sleeve contacts 11, i.e. the short circuit of the Lines 13 is canceled. It is reversed when pulling out the connector pins 21 the short circuit of both lines is restored before the pins 21 leave the sleeve contacts 9, i.e. the secondary winding of the current transformer is constantly short-circuited, be it through contact 4 or through the device 20 yourself.

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1 0 9 8? ? / Π 1 row

Claims (3)

Patent claims: 1.Socket device for switching on devices with plugs, e.g. from relays or measuring devices, in the secondary circuit of a current transformer, characterized in that the connector from an insulating base (2) with sleeve contacts fastened therein (9) to accommodate the connector pins (21) of the device (20) to be connected to the secondary circuit of the current transformer "consists of one in a cavity (3) of the insulating material base (2) against a spring (6) between two positions displaceable contact bracket (4) in one position the sleeve contacts (9) electrically connects to one another and can be brought into a second end position by a pin (22) attached to the device (20) to be inserted, in which the Sleeve contacts (9) no longer connect with one another. 2. Plug device according to claim 1, characterized in that the contact bracket (4) consists of a roof-shaped bent sheet metal strip with hook-shaped ends (8), which by the spring (6) acting on the contact bracket (4) against the Contact sleeves (9) and pressed against surfaces (10) of a web (27) which closes the opening (3) of the base (2) receiving the contact bracket (4) at the bottom, 3. Plug device according to claim 1, characterized in that a guide and actuating pin on the contact bracket (4) (14) is attached of such a length that the connection of the both sleeve contacts (9) is only canceled after the connector pins (21) of the device (20) have been inserted into the sleeve contacts (9) are introduced. 1098 ?? / MS1 Blank page