A partial discharge detection system comprising: a partial discharge acquisition and processing device comprising: a partial discharge detection device (401, 402) configured to provide a detected partial discharge electrical signal (S PD1) from partial discharge pulse generated by a first electrical object; a first communication module configured to receive a detected synchronization signal carrying detected synchronization phase values (φ ACtn) and corresponding reference time values (t n) associated with an electrical supplying voltage (V AC) of a second electrical object; the partial discharge detection system further comprising: a phase value generator configured to produce synthetized phase values (φ SYNtn) representing a synthetized synchronization signal (S syn), the phase value generator being adjustable according to phase errors (ε i); an error computing module configured to compute said phase errors (ε i) from the synthetized phase values (φ SYNtn),the detected synchronization phase values (φ ACtn) and the corresponding reference time values (t n); the error computing module is configured to compute a current phase error (ε i) from a past detected synchronization phase value (φ ACtj) associated with a past reference time value (t j) and a comparison value; a time shifter module configured to select among the synthetized phase values (φ SYNtn) a past synthetized phase value (φ SYNtj) generated at said past reference time value (t j) and provide said past synthetized phase value as comparison value to the error computing module; a sensor module configured to convert the electrical supplying voltage (V AC) in a converted electrical signal; a synchronization processing module (204, 203) structured to receive the converted electrical signal and generate said detected synchronization signal by associating the detected synchronization phase values (φ ACtn) to the corresponding reference time values; a second communication module configured to transmit said detected synchronization signal along a communication network connectable to said first communication module; a time reference source (800; 850; 900) structured to provide a time reference signal to the partial discharge acquisition and processing device and the synchronization detection apparatus to generate said reference time values (t n); an acquisition device configured to receive the synthetized synchronization signal (S syn) and the detected partial discharge electrical signal (S PD1) and perform acquisition processing of the detected partial discharge signal (S PD1). a partial discharge detection device (401, 402) configured to provide a detected partial discharge electrical signal (S PD1) from partial discharge pulse generated by a first electrical object; a first communication module configured to receive a detected synchronization signal carrying detected synchronization phase values (φ ACtn) and corresponding reference time values (t n) associated with an electrical supplying voltage (V AC) of a second electrical object; the partial discharge detection system further comprising: a phase value generator configured to produce synthetized phase values (φ SYNtn) representing a synthetized synchronization signal (S syn), the phase value generator being adjustable according to phase errors (ε i); an error computing module configured to compute said phase errors (ε i) from the synthetized phase values (φ SYNtn),the detected synchronization phase values (φ ACtn) and the corresponding reference time values (t n); the error computing module is configured to compute a current phase error (ε i) from a past detected synchronization phase value (φ ACtj) associated with a past reference time value (t j) and a comparison value; a time shifter module configured to select among the synthetized phase values (φ SYNtn) a past synthetized phase value (φ SYNtj) generated at said past reference time value (t j) and provide said past synthetized phase value as comparison value to the error computing module; a sensor module configured to convert the electrical supplying voltage (V AC) in a converted electrical signal; a synchronization processing module (204, 203) structured to receive the converted electrical signal and generate said detected synchronization signal by associating the detected synchronization phase values (φ ACtn) to the corresponding reference time values; a second communication module configured to transmit said detected synchronization signal along a communication network connectable to said first communication module; a time reference source (800; 850; 900) structured to provide a time reference signal to the partial discharge acquisition and processing device and the synchronization detection apparatus to generate said reference time values (t n); an acquisition device configured to receive the synthetized synchronization signal (S syn) and the detected partial discharge electrical signal (S PD1) and perform acquisition processing of the detected partial discharge signal (S PD1).