Abstract: This invention describes a method and an electrical circuit for controlling the closing of a three-phase circuit breaker with simultaneous pole operation to mitigate the inrush current resulting from power transformer energization by taking into account the residual magnetic flux in the transformer's magnetic core. It is disclosed a method to perform controlled switching on transformer and therefore mitigate the inrush current. It is disclosed that this method can be applied to any configuration of transformers which can be, but not limited to, Y-?, Y-Y, ?-? and ?-Y with either floating or grounded neutral.

Abstract: It is disclosed a technique to reduce significantly the arc flash incident energy in commercial and industrial electrical installations connected to typical electric distribution networks, by limiting transformer inrush current and allowing more sensitive protection settings. It also disclosed a technique to increase the energy capacity of these installations. Inrush current reduction is achieved through the use of a Controlled Switching Device (CSD). It is disclosed a method for lowering an arc flash inside an electrical circuit comprising a breaker and being electrically fed with an electrical current, the method comprising the step of providing the electrical circuit with a CSD adapted to send an open or close command to the breaker in order to synchronize an open and close mechanical operation, preferably at an optimal electrical angle. It is also disclosed an electric circuit comprising a CSD for lowering an arc flash inside the circuit.

Abstract: It is disclosed a technique in which Controlled Switching Devices (CSDs) are used to control medium and high voltage circuit breakers to mitigate switching transients. This invention describes a method for controlling the closing of a circuit breaker to mitigate and/or eliminate the inrush current in capacitive loads such as capacitor banks and filters by taking into account the residual DC voltage charges that may be present in the load. It is disclosed a method to perform fast switching operations on capacitive loads and therefore eliminate the load discharge period.

Abstract: This invention describes a method and an electrical circuit for controlling the closing of a three-phase circuit breaker with simultaneous pole operation to mitigate the inrush current resulting from power transformer energization by taking into account the residual magnetic flux in the transformer's magnetic core. It is disclosed a method to perform controlled switching on transformer and therefore mitigate the inrush current. It is disclosed that this method can be applied to any configuration of transformers which can be, but not limited to, Y-?, Y-Y, ?-? and ?-Y with either floating or grounded neutral.

Abstract: It is disclosed a technique to reduce significantly the arc flash incident energy in commercial and industrial electrical installations connected to typical electric distribution networks, by limiting transformer inrush current and allowing more sensitive protection settings. It also disclosed a technique to increase the energy capacity of these installations. Inrush current reduction is achieved through the use of a Controlled Switching Device (CSD). It is disclosed a method for lowering an arc flash inside an electrical circuit comprising a breaker and being electrically fed with an electrical current, the method comprising the step of providing the electrical circuit with a CSD adapted to send an open or close command to the breaker in order to synchronize an open and close mechanical operation, preferably at an optimal electrical angle. It is also disclosed an electric circuit comprising a CSD for lowering an arc flash inside the circuit.