DE19757844A1 - Switch arcing detector with non-wound light guide - Google Patents

Abstract

An arcing detector comprises a non-wound light guide (2) within a transparent flexible plastic tube (3), the ends of the tube and the light guide being connected to light guide plugs (4).

Description

The invention relates to an arcing fault detector for detecting arcing faults in switchgear according to the preamble of claim 1.

From DE 295 05 362 U1 an arcing fault detector is known which consists of a a support rod helically wound optical fiber with a Shrink tubing and connectors.

The detector is protected from mechanical destruction and for laying in Suitable for low and medium voltage switchgear.

However, the winding has the disadvantage that a relatively long optical fiber length is required and the production is very complex.

It is also known to lay the optical fiber unprotected (DD 271 397 A1, DE 43 31 716).

The object of the invention is to provide an arc fault detector according to the preamble of Claim 1 to create the unbreakable in good optical properties Switchgear can be relocated.

The object of the invention is characterized by the characterizing features of Claim 1 solved, while in the subclaims particularly advantageous Developments of the invention are characterized.

Based on the drawings, in which an embodiment is shown, the Invention, further refinements and improvements of the invention and others Advantages are described and explained in more detail.

It shows:

Fig. 1 is an illustration of the arcing fault detector,

Fig. 2 is an enlarged view of a pipe section with optical fiber and

Fig. 3 is an enlarged view of an optical fiber connector.

Fig. 1 shows the arcing detector for the detection of arcing in switchgear. This consists of an optical waveguide 2 , in which the light is radially coupled in, and optical waveguide connectors 4 . The optical waveguide 2 is guided unwound in a translucent tube 3 made of flexible plastic. The ends of the tube 3 and the optical fiber 2 are connected to the optical fiber connectors 4 .

The tube 3 is temperature-resistant up to at least 125 ° C and consists of polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE).

The PVDF thermoplastics are e.g. B. under the trade names Kynar (manufacturer: Indchem) or Dyflor (manufacturer: Dynamit Nobel).

The PTFE thermoplastics are e.g. B. under the trade names Teflon (manufacturer: Du Pont) or Hostaflon TFM (manufacturer: Hoechst).

The optical waveguide 2 is a commercially available optical waveguide made of glass or plastic with a step or gradient index.

The fiber optic connector 4 are standard connectors z. B. ST or SC connector.

Alternatively, the same transparent plastic can be extruded onto the fiber become.

Reference list

1

Arc fault detector

2nd

optical fiber

3rd

pipe

4th

Fiber optic connector

Claims (13)

1. Arc detector for detection of arcing in switchgear best of an optical fiber, in which the light is radially coupled and optical fiber connectors, characterized in that the optical fiber ( 2 ) in a translucent tube ( 3 ) made of flexible plastic is unwound, and that Ends of the tube ( 3 ) and the optical fiber ( 2 ) are connected to the optical fiber connectors ( 4 ). 2. Arc fault detector according to claim 1, characterized in that the tube ( 3 ) is temperature resistant. 3. Arc fault detector according to claim 2, characterized in that the tube ( 3 ) is temperature resistant up to at least 125 ° C. 4. Arc fault detector according to one of the preceding claims, characterized in that the tube ( 3 ) consists of PTFE material. 5. Arc fault detector according to one of the preceding claims, characterized in that the tube ( 3 ) consists of PVDF material. 6. Arc detector according to one of the preceding claims, characterized in that the optical waveguide ( 2 ) is a commercially available optical waveguide. 7. Arc fault detector according to one of the preceding claims, characterized in that the optical waveguide ( 2 ) is a glass optical waveguide. 8. Arc fault detector according to one of the preceding claims, characterized in that the optical waveguide ( 2 ) is a plastic optical waveguide. 9. Arc fault detector according to one of the preceding claims, characterized in that the optical waveguide ( 2 ) is an optical waveguide with a step index. 10. Arc fault detector according to one of the preceding claims, characterized in that the optical waveguide ( 2 ) is an optical waveguide with a gradient index. 11. Arc detector according to one of the preceding claims, characterized in that the optical fiber connector ( 4 ) are standard connectors. 12. Arc detector according to one of the preceding claims, characterized in that the optical fiber connector ( 4 ) are ST connector. 13. Arc detector according to one of the preceding claims, characterized in that the optical fiber connector ( 4 ) are SC connector.