摘要:
The present invention is related to a device (1) for the detection of direct and/or alternating current to be used in the realisation of highly sensitive amperometric measuring instruments or for the detection of differential faults along with automatic switches. The inventive device comprises a magnetic core (5) disposed in such a manner to surround at least one current-carrying conductor (6). A winding (10) surrounds the magnetic core (5) and is electrically connected to an electrical resistance (60). A voltage source (40) generates a drive voltage (Vexcit) which permits the circulation of a pick-up current (Iexcit) in the said winding (10) and in the said core (5). Amplification means (20) are used to detect the voltage (Vsense) at the terminals of the resistance (60) in order to generate a first signal (Vampl) which is representative of the above defined current (lexcit). The inventive device (1) also comprises a feedback adjustment circuit block (70) which acquires the first input signal (Vampl) in order to generate a second signal which inverts the said drive voltage (Vexcit) when the pick-up current (Iexcit) reaches preset values.
摘要:
The present invention is related to a device (1) for the detection of direct and/or alternating current to be used in the realisation of highly sensitive amperometric measuring instruments or for the detection of differential faults along with automatic switches. The inventive device comprises a magnetic core (5) disposed in such a manner to surround at least one current-carrying conductor (6). A winding (10) surrounds the magnetic core (5) and is electrically connected to an electrical resistance (60). A voltage source (40) generates a drive voltage (Vexcit) which permits the circulation of a pick-up current (Iexcit) in the said winding (10) and in the said core (5). Amplification means (20) are used to detect the voltage (Vsense) at the terminals of the resistance (60) in order to generate a first signal (Vampl) which is representative of the above defined current (lexcit). The inventive device (1) also comprises a feedback adjustment circuit block (70) which acquires the first input signal (Vampl) in order to generate a second signal which inverts the said drive voltage (Vexcit) when the pick-up current (Iexcit) reaches preset values.
摘要:
An electrical device for protection against residual currents, which comprises an insulating casing having a rear wall, a front wall, a bottom wall, a top wall, and two side walls. Inside said casing there are: a residual-current sensor, which comprises a toroidal core, a primary winding and a secondary winding; and a tripping relay, having a containment box, from a wall of which there protrude a first pin and a second pin designed to enable operative connection of the relay with the current sensor via circuit-connection means positioned between them. Said connection means comprise a first substantially rigid body, on which there are defined two distinct electrically conductive paths; the first conductive path has a first end connected to the secondary winding and a second free end designed to be connected operatively to said first pin, and the second path has a third end connected to the secondary winding and a fourth free end designed to be connected to said second pin, said first and second pins and said second and fourth free ends being located in a spatial position that is pre-defined with respect to one of said walls of the casing.
摘要:
An electronic earth leakage current device for a low-voltage power line, comprising: a moving contact and a fixed contact which can be mutually coupled/uncoupled; first sensor means for detecting an earth leakage current and for generating an electric signal which is indicative of the value of the earth leakage current; first electronic means which are electrically connected to the first sensor means in order to generate, on the basis of an electric signal which is indicative of the value of the earth leakage current, an electric tripping signal; and actuation means, operatively connected to the moving contact, in order to perform, in response to the electric tripping signal, the separation of the moving contact from the fixed contact. Its particularity consists of the fact that it comprises second electronic means for controlling, depending on the electric signal which is indicative of the value of the earth leakage current, signaling means which are suitable to provide the user with information regarding the value of the detected earth leakage current.
摘要:
A terminal for low-voltage terminal device, whose particularity consists of the fact that it comprises: a cage, which is shaped substantially like a parallelepiped that has a cavity suitable to receive at least one first electrical conductor and one second electrical conductor, which are meant to be mutually connected electrically, the cage having an upper wall provided with a threaded through hole, a lower wall, two side walls, and two walls, respectively a front wall and a rear wall, that are open so as to allow access to the cavity; a lockdown screw, which is functionally coupled to the threaded hole and is arranged so as to pass through the upper wall so as to move within the cavity and facilitate the locking of the first and second electrical conductors; a first plate, which is coupled to the cage at the common edge between the front and lower walls and protrudes transversely from the lower wall outside the cavity; and a second plate, which is functionally connected to the screw so that it can move with respect to the screw and to the cage and is arranged so that a portion thereof is partially inserted in the cavity so as to cooperate with the screw for the locking of the first and second electrical conductors.
摘要:
A Circuit breaker comprising: a case (1); terminals (2,3) for connection to an electric circuit; separable contact means (4,5); an actuating knob (6) which rotates about a first pivot (7) that is rigidly coupled to the case (1) between a closed position, in which the contacts are coupled, and an open position, in which they are separated, a first spring (8) being associated with the knob (6); electric arc quenching means; protection means against electrical faults; a kinematic mechanism, which comprises a first supporting lever, on which the moving contact (5) is arranged, the supporting lever being operatively connected to the knob by virtue of a connecting element (18), and a second release lever, which is operatively associated with the protection means, the first and second levers being mounted coaxially and rotating about a second pivot (19) that is rigidly coupled to the cases, a second spring being associated with the first and second levers; the kinematic mechanism further comprises a third actuation lever (24) which is operatively coupled to the moving contact (5), a third actuation spring (25) being associated with the third actuation lever (24) and applying to it a force that is suitable to facilitate an adequate coupling pressure between the contacts (4,5) in the closed position and to cause the rotation thereof together with the moving contact (5) when the protection means intervene.
摘要:
A kinematic mechanism for a low-voltage protection and/or current interruption device, comprising actuation means that are operatively associated with moving contact means that can be coupled/uncoupled with respect to corresponding fixed contact means, the moving contact means comprising at least one moving contact and the fixed contact means comprising at least one fixed contact, the actuation means comprising means (11) for actuating and releasing the moving contact which are operatively connected to an actuation arm by virtue of connection means, its particularity consisting of the fact that the means for the actuation and release of the moving contact comprise a single body (11) that has a first portion (12), which is operatively associated with the moving contact means and with the connection means, and a second portion (13), which is operatively associated with the connection means, the first and second portions being arranged coaxially on a common rotation axis (20) and being connected by virtue of a third portion (15) that comprises at least one first elastic and resilient element and allows a mutual rotation of the first and second portions with respect to the common rotation axis.
摘要:
A cabinet structure for electric switchboards, said cabinet having a first rear wall, a second and a third wall respectively superior and inferior, a fourth and a fifth sidewalls and a sixth front wall, said walls defining an internal volume able to contain one or more electric devices, said structure comprising six sub-structures, the first, second, third, fourth and fifth sub-structures being directly coupled one to another.