Abstract: A precipitation hardenable, martensitic stainless steel is disclosed. The alloy has the following broad composition in weight percent. Ni 10.5-12.5 Co 1.0-6.0 Mo 1.0-4.0 Ti 1.5-2.0 Cr ?8.5-11.5 Al Up to 0.5 Mn ?1.0 max. Si 0.75 max. B 0.01 max. The balance of the alloy is iron and the usual impurities found in commercial grades of precipitation hardenable martensitic stainless steels as known to those skilled in the state of the art in melting practice for such steels. A method of making parts from the alloy and an article of manufacture made from the alloy are also described.

Abstract: The invention relates to a control unit for a medium voltage switching apparatus. The control unit is adapted to carry out a diagnostic method to check operating conditions of one or more components of said electric poles. The diagnostic method includes the following steps: basing on a selected ideal position curve, obtaining one or more first curves indicative of an ideal behaviour of said switching apparatus, during an opening manoeuvre or closing manoeuvre of the switching apparatus; basing on detection signals provided by a closed-loop control arrangement of said control unit, calculating one or more second curves indicative of an actual behaviour of said switching apparatus, during an opening manoeuvre or closing manoeuvre of said switching apparatus; and carrying out a comparison procedure among said first and second curves.

Abstract: A precipitation hardenable, martensitic stainless steel is disclosed. The alloy has the following broad composition in weight percent. Ni 10.5-12.5 Co 1.0-6.0 Mo 1.0-4.0 Ti 1.5-2.0 Cr ?8.5-11.5 Al Up to 0.5 Mn ?1.0 max. Si 0.75 max. B 0.01 max. The balance of the alloy is iron and the usual impurities found in commercial grades of precipitation hardenable martensitic stainless steels as known to those skilled in the state of the art in melting practice for such steels. A method of making parts from the alloy and an article of manufacture made from the alloy are also described.

Abstract: The present invention relates to a method for controlling a motor-driven vacuum circuit breaker. The method comprises initiate opening (S100) the circuit breaker, wherein the circuit breaker moves with an average opening speed of a contact pair of the circuit breaker, from a closed position to an open position of the circuit breaker, and decelerating (S110) the opening speed of the contact pair to below the average opening speed before the open position is reached to avoid overshoot, and initiate closing (S120) the circuit breaker, wherein the circuit breaker moves with an average closing speed of the contact pair, from the open position to the closed position, and decelerating (S130) the closing speed of the contact pair to below the average closing speed before contact touch at the closed position, wherein the circuit breaker moves with the decelerated speed at contact touch. A motor-driven vacuum circuit breaker, a computer program and a computer program product are also presented.

Abstract: The present disclosure relates to an electroacoustic earcup (1) for open-back headphones and to open-back headphones (100) comprising a pair of electroacoustic earcups (1a, 1b). The electroacoustic earcup (1) is characterized in that it comprises first and second electroacoustic transducers (8a, 8b) arranged one behind the other within a hollow housing (2) which comprises a side wall (5), and first and second openings (30, 40). Each transducer comprises a vibrating diaphragm (10a, 10b) facing the first aperture (30) and an input surface (11a, 11b) facing the second opening (40), wherein each input surface (11) is in fluid communication with its respective diaphragm (10). The first and second electroacoustic transducers (8a, 8b) are hermetically connected by the side wall 5 of the hollow housing (2). An isobaric chamber (12) is defined by the diaphragm (10b) of the second transducer (8b), the input surface (11a) of the first transducer (8a) and the side wall (5) of the housing (2).

Abstract: The present invention relates to a method for controlling a motor-driven vacuum circuit breaker. The method comprises initiate opening (S100) the circuit breaker, wherein the circuit breaker moves with an average opening speed of a contact pair of the circuit breaker, from a closed position to an open position of the circuit breaker, and decelerating (S110) the opening speed of the contact pair to below the average opening speed before the open position is reached to avoid overshoot, and initiate closing (S120) the circuit breaker, wherein the circuit breaker moves with an average closing speed of the contact pair, from the open position to the closed position, and decelerating (S130) the closing speed of the contact pair to below the average closing speed before contact touch at the closed position, wherein the circuit breaker moves with the decelerated speed at contact touch. A motor-driven vacuum circuit breaker, a computer program and a computer program product are also presented.

Abstract: The invention relates to a control unit for a medium voltage switching apparatus. The control unit is adapted to carry out a diagnostic method to check operating conditions of one or more components of said electric poles. The diagnostic method includes the following steps: basing on a selected ideal position curve, obtaining one or more first curves indicative of an ideal behaviour of said switching apparatus, during an opening manoeuvre or closing manoeuvre of the switching apparatus; basing on detection signals provided by a closed-loop control arrangement of said control unit, calculating one or more second curves indicative of an actual behaviour of said switching apparatus, during an opening manoeuvre or closing manoeuvre of said switching apparatus; and carrying out a comparison procedure among said first and second curves.

Abstract: A method is provided for determining the operating status a MV switching apparatus. The method includes providing a test signal to the test winding for an observation period of time, the test signal having a waveform capable of exciting the magnetic element; obtaining first measuring data indicative of a voltage at first terminals of the capacitor bank during the observation period of time; obtaining second measuring data indicative of a voltage at second terminals of the test winding and indicative of a current circulating along the test winding during the observation period of time; and, calculating estimation data indicative of the operating status of the capacitor bank at the end of the observation period of time on the basis of the first and second measuring data, the first estimation data comprising a first estimation value indicative of the capacitance of the capacitor bank.

Abstract: The present invention relates to a method for controlling a motor-driven vacuum circuit breaker. The method comprises initiate opening (S100) the circuit breaker, wherein the circuit breaker moves with an average opening speed of a contact pair of the circuit breaker, from a closed position to an open position of the circuit breaker, and decelerating (S110) the opening speed of the contact pair to below the average opening speed before the open position is reached to avoid overshoot, and initiate closing (S120) the circuit breaker, wherein the circuit breaker moves with an average closing speed of the contact pair, from the open position to the closed position, and decelerating (S130) the closing speed of the contact pair to below the average closing speed before contact touch at the closed position, wherein the circuit breaker moves with the decelerated speed at contact touch. A motor-driven vacuum circuit breaker, a computer program and a computer program product are also presented.

Abstract: An electronic charger for electric power distribution installations is provided. The electronic charger includes a DC/DC converter of the SEPIC type including an input stage, an output stage and a coupling capacitor. The input stage is electrically connected with input terminals and includes an input inductor and a switching device. The output stage is electrically connected with output terminals and includes an output inductor, an output capacitor and a blocking device. The coupling capacitor is configured to electrically couple the input stage and the output stage with a capacitive coupling. A first sensor provides a first sensing signal indicative of a charging current. A first controller receives the first sensing signal and a reference signal and provides a driving signal to control the switching device.

Abstract: A method for determining the operating status of a MV switching device is provided. The method includes providing a test signal to said test coil for an observation period of time. Measuring data is obtained which is indicative of the voltage at the terminals of the test coil and of the current circulating along the test coil during the observation period of time. Observation data is calculated which is indicative of the electric behavior of the test coil at the end of said observation period of time. A transformation function is selected which is indicative of the electromagnetic behavior of the electromagnetic actuator. First estimation data is calculated which is indicative of the operating status of the electromagnetic actuator.

Abstract: A switching device for an electric circuit, the switching device comprising: at least one phase having a movable contact which can be coupled to/separated from a corresponding fixed contact; a kinematic chain operatively associated to the movable contact; driving means adapted to move the kinematic chain between a first position and a second position for actuating the movable contact; and control means adapted to control the driving means.

Abstract: A control system for an electrical switching apparatus adapted to be installed in a medium voltage or high voltage electrical circuit. The control system includes at least a first module with first control means which are adapted to execute a first control logic, and a second module with second control means which are adapted to execute a second control logic; and at least one communication bus. The first control means and the second control means are adapted to be operatively connected to the at least one communication bus, and to share values of variables associated to the first control logic and to the second control logic through the at least one communication bus.

Abstract: A MV switching device (100) comprising: one or more electric poles, each comprising a movable contact (16) and a fixed contact (17) adapted to be coupled or uncoupled during the switching operations of said switching device; and an electromagnetic actuator (13) operatively coupled to the movable contacts of the electric poles, said electromagnetic actuator having at least an excitation winding (152); power supply means (60) for supplying electric power to said electromagnetic actuator; a power drive circuit (1) for driving said electromagnetic actuator, said power drive circuit comprising sensing means for providing signals indicative of the currents flowing along the circuit branches of said power drive circuit and of the voltages at the terminals of said power drive circuit.

Abstract: A gas oven comprises an oven space, having a bottom baking surface, two side walls rising up on opposite sides of the baking surface and at least one top wall facing the baking surface, burner means configured to raise the temperature of the oven space and a control unit associated with the burner means and configured to drive them as a function of a command given by a user to determine a preset temperature inside the oven space. The burner means comprise at least a first radiating element and a second radiating element which are independent of one another and which are configured to vary the temperature at the baking surface and at the top wall, respectively, and the control unit comprises at least a first drive module and a second drive module associated with the first radiating element and with the second radiating element, respectively, in order to control the first radiating element and the second radiating element independently of one another.

Abstract: A method for determining the operating status a MV switching apparatus, which comprises: one or more electric poles, each comprising a movable contact and a fixed contact adapted to be coupled or uncoupled during the switching operations of the switching apparatus; an electromagnetic actuator for actuating one or more movable contacts of the electric poles, the electromagnetic actuator having at least a test winding wound around a magnetic element; a capacitor bank for providing electric power to the electromagnetic actuator.

Abstract: An electronic charger for electric power distribution installations is provided. The electronic charger includes a DC/DC converter of the SEPIC type including an input stage, an output stage and a coupling capacitor. The input stage is electrically connected with input terminals and includes an input inductor and a switching device. The output stage is electrically connected with output terminals and includes an output inductor, an output capacitor and a blocking device. The coupling capacitor is configured to electrically couple the input stage and the output stage with a capacitive coupling. A first sensor provides a first sensing signal indicative of a charging current. A first controller receives the first sensing signal and a reference signal and provides a driving signal to control the switching device.

Abstract: A method controls a switching device having at least one phase comprising at least one couple of contacts which can be actuated for switching between a closed condition and an open condition. The method provides control means for controlling the actuation of the at least one couple of contacts, such control means being adapted to operate using time cycles; set the time cycles with a predetermined time duration; detects a difference of a value of a parameter associated to the phase with respect a preset value.

Abstract: A control system for an electrical switching apparatus adapted to be installed in a medium voltage or high voltage electrical circuit. The control system includes at least a first module with first control means which are adapted to execute a first control logic, and a second module with second control means which are adapted to execute a second control logic; and at least one communication bus. The first control means and the second control means are adapted to be operatively connected to the at least one communication bus, and to share values of variables associated to the first control logic and to the second control logic through the at least one communication bus.

Abstract: A switching device for an electric circuit, the switching device comprising: at least one phase having a movable contact which can be coupled to/separated from a corresponding fixed contact; a kinematic chain operatively associated to the movable contact; driving means adapted to move the kinematic chain between a first position and a second position for actuating the movable contact; and control means adapted to control the driving means.