Remote calculation of earth connection impedance

An apparatus configured to remotely determine an impedance of an earth connection of a first electrical equipment connected to a power supply network, the apparatus comprising a processor and a memory, the memory storing instructions that cause the processor to:

• receive, from a first measurement node connected to the first electrical equipment, a first value of an insulation impedance of the power supply network, wherein the first measurement node and the first electrical equipment share an earth connection;
• receive, from a second measurement node connected to the power supply network, a second value of an insulation impedance of the power supply network;
• and
• calculate, using one or more processors and a memory comprising computer readable instructions executable by the processors, the impedance of the earth connection of the first electrical equipment using the first value of the insulation impedance of the power supply network, the second value of the insulation impedance of the power supply network and a known impedance value of an earth connection of the second measurement node.

A non-transitory computer-readable medium comprising instructions which, when executed by a computer, cause the computer to perform a method remotely determining an impedance of an earth connection of a first electrical equipment connected to a power supply network, the method comprising:

• receiving, from a first measurement node connected to the first electrical equipment, a first value of an insulation impedance of the power supply network;
• receiving, from a second measurement node connected to the power supply network, a second value of an insulation impedance of the power supply network;
• and
• calculating the impedance of the earth connection of the first electrical equipment using the first value of the insulation impedance of the power supply network, the second value of the insulation impedance of the power supply network and a known impedance value of an earth connection of the second measurement node.