Method and apparatus for controlling arc suppression device

An apparatus for controlling an arc suppression device of a three-phase electric network, the arc suppression device having an adjustable admittance connected between a neutral point of the three-phase electric network and earth, the apparatus configured to:

• perform a current injection into the neutral point of the three-phase electric network by using a frequency different from a frequency of the three-phase electric network;
• obtain a value of a zero-sequence impedance of the three-phase electric network, or of a quantity representative of the zero-sequence impedance of the three-phase electric network, during the current injection and/or obtain a value of a zero-sequence admittance of the three-phase electric network, or of a quantity representative of the zero-sequence admittance of the three-phase electric network, during the current injection;
• and
• determine, based on the obtained value of the zero-sequence impedance, or of the quantity representative thereof, and/or based on the obtained value of the zero-sequence admittance, or of the quantity representative thereof, whether to initiate a tuning of the arc suppression device of the three-phase electric network.

A controller for an arc suppression device for a three-phase electric network, the arc suppression device having an adjustable admittance configured to be connected between a neutral point of the three-phase electric network and earth, the controller comprising at least one processor and a memory storing instructions that, when executed by the at least one processor, cause the controller to:

• perform a current injection into the neutral point of the three-phase electric network by using a frequency different from a frequency of the three-phase electric network;
• obtain a value of a zero-sequence impedance of the three-phase electric network, or of a quantity representative of the zero-sequence impedance of the three-phase electric network, during the current injection and/or obtain a value of a zero-sequence admittance of the three-phase electric network, or of a quantity representative of the zero-sequence admittance of the three-phase electric network, during the current injection;
• and
• determine, based on the obtained value of the zero-sequence impedance, or of the quantity representative thereof, and/or based on the obtained value of the zero-sequence admittance, or of the quantity representative thereof, whether to initiate a tuning of the arc suppression device of the three-phase electric network.