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Abb Service S.r.l.

Antonio Maria Gabello

Paolo Gritti

Severino Colombo

Massimo Pozzi

A method is provided for managing a fault event in a network for distributing low-voltage or high-voltage electrical energy, which comprises at least one voltage source and a load. The method includes performing at least one step of a first procedure for detecting the existence of fault conditions in the load and performing at least one step of a second procedure for determining, on the basis of the evolution in time of the derivative of the instantaneous current in the load, the state of execution of an interruption manoeuvre started by at least one protection device adapted to interrupt locally the passage of current in the load. An electronic protection unit is also provided that is able to execute the aforesaid method.

Method for managing a fault event in a network for distributing electrical energy, and a corresponding electronic protection unit

A device for powering one or more electric/electronic devices operatively associated with a low-voltage circuit breaker takes energy from a power supply line. An electronic regulator receives the energy collected as an input and delivering as an output to the electric/electronic device a power supply voltage (Vout) having a value within a preset range with respect to a reference voltage (VR). The electronic regulator includes an energy storage device chargeable by the energy collected, at the terminals of which a voltage (VCL) is established that is indicative of the power supply voltage (Vout) delivered to the electric/electronic device. A circuit enables/disables the charging of the storage device, and a feedback circuit receives a signal indicative of the voltage (VCL) at the terminals of the storage device and sends a signal to the enabling/disabling circuit to trigger the disabling or enabling of the charging process in order to keep the value of the voltage at the terminals of the storage device within a preset range. The feedback circuit enables the charging phases so as to power the storage device continuously up until the value of the voltage at their terminals comes within the preset range.

Device for powering electric or electronic devices operatively associated with a circuit breaker

An electronic tripping device for low-voltage circuit-breakers comprises means for detection and calculation of a ground-fault current operatively connected to tripping means of said circuit-breaker. The means for detection and calculation comprise: current-sensor means, which supply, for each pole, a signal proportional to the current; means for detection of the sign of the current, which, for each pole, supply a signal representing the sign of the current; current-rectifying means, which, for each pole, supply a rectified signal proportional to the current circulating in said pole; and first numerical-processing means, which supply a value with sign representing a ground fault by means of a numerical-processing operation comprising the multiplication of the signal representing the sign by the corresponding rectified signal.

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Bergamo, Italy

Antonio Maria Gabello