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 (1, 6) 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 (1, 6) 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 (1, 6) between the first and second areas (9, 10) 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 (1, 6) 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 (1, 6) 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 (1, 6) 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 (1, 6) between the first and second areas (9, 10) 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 (1, 6) 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 (1, 6) between the first and second areas (9, 10) 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 (1, 6) if the measured time interval (T d2) is equal to or greater than said time threshold value (TH t).