Method of performing circuit opening and closing operation, computer program, control system and power system

A computer program comprising computer code which when executed by processing circuitry of a control system causes the control system to command performance of a method of performing a circuit opening and closing operation in a power system having a first phase, a second phase lagging the first phase by 120°, and a third phase lagging the first phase by 240°, the method having the steps:

• a) opening only a reference phase among the first phase, the second phase and the third phase such that a reference current of the reference phase is interrupted at a first current zero crossing after the opening;
• b) opening the remaining phases of the first phase, the second phase and the third phase after step a);
• c) closing only the reference phase and a phase among the first phase, the second phase and the third phase lagging the reference phase by 120° simultaneously or essentially simultaneously at a closing phase angle of a phase to ground voltage of the reference phase of 320°±70° when the current zero crossing is a positive current zero crossing, or of 140°±70° when the current zero crossing is a negative current zero crossing;
• and
• d) closing the phase lagging the reference phase by 240° after step c).

A control system for controlling a circuit breaker system connected to a three-phase power source having a first phase, a second phase lagging the first phase by 120°, and a third phase lagging the first phase by 240°, wherein the control system comprises:

• processing circuitry;
• and
• a storage medium having computer code which when executed by the processing circuitry causes the control system to perform a method of performing a circuit opening and closing operation in a power system having a first phase, a second phase lagging the first phase by 120°, and a third phase lagging the first phase by 240°, the method including the steps:
• a) opening only a reference phase among the first phase, the second phase and the third phase such that a reference current of the reference phase is interrupted at a first current zero crossing after the opening;
• b) opening the remaining phases of the first phase, the second phase and the third phase after step a);
• c) closing only the reference phase and a phase among the first phase, the second phase and the third phase lagging the reference phase by 120° simultaneously or essentially simultaneously at a closing phase angle of a phase to ground voltage of the reference phase of 320°±70° when the current zero crossing is a positive current zero crossing, or of 140°±70° when the current zero crossing is a negative current zero crossing;
• and
• d) closing the phase lagging the reference phase by 240° after step c).

A power system comprising:

• a control system for performing a circuit opening and closing operation in a power system having a first phase, a second phase lagging the first phase by 120°, and a third phase lagging the first phase by 240°, the method comprising:
• a) opening only a reference phase among the first phase, the second phase and the third phase such that a reference current of the reference phase is interrupted at a first current zero crossing after the opening;
• b) opening the remaining phases of the first phase, the second phase and the third phase after step a);
• c) closing only the reference phase and a phase among the first phase, the second phase and the third phase lagging the reference phase by 120° simultaneously or essentially simultaneously at a closing phase angle of a phase to ground voltage of the reference phase of 320°±70° when the current zero crossing is a positive current zero crossing, or of 140°±70° when the current zero crossing is a negative current zero crossing;
• and
• d) closing the phase lagging the reference phase by 240° after step c);
• a circuit breaker system having a first pole, a second pole and a third pole;
• and
• three actuating devices, each actuating device being configured to actuate a respective one of the first pole, the second pole and the third pole;
• wherein the control system is configured to control the actuating devices.