1. Solid insulation defects are irreversible.
2. The short-term 24h intensive care monitoring system shall be installed in the joint set of the suspected signal and the joint set around the signal.
3. Discharge spectrogram of the system towards the key monitoring joints shall be saved at regular time and remote measurement and control technology shall be used to measure the measurement points at any time.
4. More accurate conclusions of the suspected signal are given.