Electricity meter assembly for open and short circuit detection

An electricity meter assembly, comprising:

• a sensor module configured to connect to an electrical system, the sensor module incorporating at least one current transformer and/or potential transformer for receiving voltage and current signals from the electrical system, and further configured to generate corresponding measurement signals;
• a meter, including a measurement module operable to receive the measurement signals from the sensor module and generate energy consumption data therefrom, the meter having means for coupling with the sensor module to facilitate a connection between the measurement module and the at least one current transformer and/or potential transformer;
• the measurement module further configured to determine a short circuit and open circuit conditions of the at least one of current transformer and potential transformer based on a received detection current from a removable expansion module;
• the removable expansion module, comprising a signal generator module, the signal generator module being operable to generate the detection current of a specific frequency, distinct from a frequency of the voltage and current signals from the electrical system, under a guidance of the meter, the removable expansion module further including means for coupling to the sensor module, thereby connecting the signal generator module to the at least one current transformer and/or potential transformer.