A processing apparatus for detecting partial discharge pulses in the presence of noise signal, comprising: - a first detector configured to detect an electromagnetic impulsive signal (P INT ; P EX2 ) from a first area of an electrical object and generate a first electrical pulse (P 1 ) representing a first detection event of the electromagnetic impulsive signal; - a second detector configured to detect the electromagnetic impulsive signal from a second area of the electrical object and generate a second electrical pulse (P 2 ) associated with a second detection event of the electromagnetic impulsive signal; - a time calculation module configured to measure a time interval (T d1; T d2 ) between the first detection event and the second detection event; - a processing module connected to the time calculation module configured to: compare the measured time interval (T d1; T d2 ) with a time threshold value (TH t ); associate the electromagnetic impulsive signal (P INT ) to partial discharge pulses generated inside the electrical object between the first and second areas if the measured time interval (T d1 ) is lower than the time threshold value (TH t ); and associate the electromagnetic impulsive signal (P EX2 ) to a noise signal generated outside the electrical object if the measured time interval (T d2 ) is equal to or greater than said time threshold value (TH t ). - a first detector configured to detect an electromagnetic impulsive signal (P INT ; P EX2 ) from a first area of an electrical object and generate a first electrical pulse (P 1 ) representing a first detection event of the electromagnetic impulsive signal; - a second detector configured to detect the electromagnetic impulsive signal from a second area of the electrical object and generate a second electrical pulse (P 2 ) associated with a second detection event of the electromagnetic impulsive signal; - a time calculation module configured to measure a time interval (T d1; T d2 ) between the first detection event and the second detection event; - a processing module connected to the time calculation module configured to: compare the measured time interval (T d1; T d2 ) with a time threshold value (TH t ); associate the electromagnetic impulsive signal (P INT ) to partial discharge pulses generated inside the electrical object between the first and second areas if the measured time interval (T d1 ) is lower than the time threshold value (TH t ); and associate the electromagnetic impulsive signal (P EX2 ) to a noise signal generated outside the electrical object if the measured time interval (T d2 ) is equal to or greater than said time threshold value (TH t ). compare the measured time interval (T d1; T d2 ) with a time threshold value (TH t ); associate the electromagnetic impulsive signal (P INT ) to partial discharge pulses generated inside the electrical object between the first and second areas if the measured time interval (T d1 ) is lower than the time threshold value (TH t ); and associate the electromagnetic impulsive signal (P EX2 ) to a noise signal generated outside the electrical object if the measured time interval (T d2 ) is equal to or greater than said time threshold value (TH t ). <EOS>