Telecommunications gas tube apparatus and composition for...

H - Electricity – 01 – J

Patent

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H01J 17/34 (2006.01) H01B 1/22 (2006.01) H01C 7/12 (2006.01) H01J 17/40 (2006.01) H01T 1/14 (2006.01)

Patent

CA 2191737

A telecommunications gas tube apparatus (40) which is suitable for connection to a gas discharge tube (12) and which comprises an electrically non-linear resistive element (45) prepared from an electrically non-linear composition which comprises a polymeric component and a particulate filler. The composition has an initial resistivity i at 25 ~C of at least 109 ohm-cm, and is such that a standard device containing the composition has an initial breakdown voltage VSi, and after the standard device has been exposed to a standard impulse breakdown test, the device has a final breakdown voltage VSf which is from 0.7VSi to 1.3VSi. In addition the composition in the device has a final resistivity f at 25 ~C of at least 109 ohm-cm. Such compositions are useful in providing both vent-safe and fail-safe protection to a gas discharge tube (12).

Dispositif à tube à décharge (40) servant à protéger un équipement de télécommunication, conçu pour s'accoupler à un tube à décharge (12), et composé d'un élément résistif, électriquement non linéaire (45), préparé à partir d'une composition électriquement non linéaire contenant un constituant polymère et une charge particulaire. Cette composition présente une résistivité initiale ?¿i?, à 25 ~C, d'au moins 10?9¿ ohm-cm, et permet à un dispositif normalisé la contenant de présenter une tension initiale de claquage V¿Si? et une tension finale de claquage V¿Sf?, située entre 0,7V¿Si? et 1,3V¿Si?, après avoir subi un essai normalisé de claquage par impulsions. De plus, cette composition dans le dispositif possède une resistivité finale ?¿f?, à 25 ~C, d'au moins 10?9¿ ohm-cm. Ces compositions constituent une protection efficace contre la détérioration thermique et contre le dégazage auxquels peut être soumis un tube à décharge (12).

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