| 摘要 |
<p>1. Device for protection against external or internal overvoltage, generated in a low voltage electrical installation, or in a distribution system, comprising a neutral conductor (N) and at least a phase conductor (L), said device being connected to earth and housed in an insulated case (20) of a module (10, 100) comprising : an overvoltage limiter (12) having non linear elements, variable with voltage, a breaking device (14) with an operating mechanism (16) of contacts (36a, 38a) electrically connected in series with the limiter (12), and a trip-release (18) co-operating with the mechanism (16) to control the disconnection of the protection device by automatic opening of the contacts (36a, 38a) of the breaking device (14) following a defective state of the elements of the overvoltage limiter (12), a first connection terminal (22) which may be connected to the phase conductor (L), a second connection terminal (26) which may be connected to earth (T), characterized in that the module (10, 100) comprises : a third connection terminal (24) which may be connected to neutral conductor (N), three star-coupled circuits (C1, C2, C3) having a first phase circuit (C1) connected between the common point (34) of the star and the first terminal connection (22), a second neutral circuit (C2) connected between common point (34) and the third connection terminal (24) and a third earth circuit (C3) connected between the common point (34) and the second connection terminal (26), each circuit (C1, C2, C3) comprising a non linear element (28, 30, 32) of the limiter (12), having a nominal voltage greater than half of the voltage value, existing between the phase conductors (L) and the neutral conductor (N) of the system, to provoke, during the destruction of anyone of non-linear elements (28, 30, 32) the destruction of series elements, the trip-release (18) of the mechanism (16) being inserted in the first phase circuit (C1), and a movable contact (38a, 36a) of the breaking device (14) disposed in each of the first and second phase circuits (C1) and neutral circuit (C2) in series with associated non linear element (28, 30), non linear element (32) of the third earth circuit (C3) being directly connected between common point (34) of the star and the second connection terminal (26).</p> |
