The stator winding insulation in petrochemical plant motors and generators have been assessed using routine on-line partial discharge (PD) testing for at least years, starting in chemical plants in the US Gulf Coast. PD are small electrical sparks that can occur in the winding insulation system due to poor manufacturing of the stator winding; or due to aging of the stator. In online PD monitoring the PD current pulses are detected by either capacitive sensors or high frequency current transformers that are mounted in the motor terminal boxes. To ensure reliable results, attention must be paid to reducing the risk of false positive indications due to electrical noise.

For the alarm setting of the self-winding machine, the system software can start the alarm according to the set alarm level. Also, depending on the level, various alarm shutdown methods are used to disconnect the automated inspection system, but if the main parameter setting is disconnected and a shutdown is required, the system software will stop the winding and the operator will Also decide whether to do it. For standard pneumatic tests, the system software sets up the original standard pneumatic test. If the working pressure is lower than the preset value, the system software will stop running and start rewinding after the standard air pressure responds.

The methods that are most successfully used employ time-of-pulse arrival, pulse shape analysis and the optimal selection of the measurement frequency range. Since the early days, great progress has been made with interpretation. Case studies from petrochemical industry machines are presented to show how machines with insulation  problems can be identified using both the trend in PD over time and the absolute magnitude of the PD. However, experience shows that the trend itself, as well as the absolute magnitude can sometimes give a misleading indication of the stator winding insulation condition.

The Auto winding machine can be self-winding and winding, the wires are neatly arranged, and the bearing capacity is stable. Operation: Stator windings can be placed manually or used in robots for automatic winding without an operator. For common fault auto-calibration and auto-identification, select the support force response system software and adjust the support force size in real time according to the entered regulations. Make sure that the bearing capacity of all motor windings is stable.

For transformer winding machines, choose coils with a compact structure, small size and high compressive strength made with this type of equipment. To further improve productivity, we have increased the speed ratio of the automatic winder server from rad / min to rad / min. The wire row configuration is pulled from two ends to three ends. That is, you can wind three additional coils at once. In addition, select multiple sections ( more) to wind up. The axial clamp configuration has been improved and the bearing capacity of the payoff reels of each structure is controlled independently, so the take-up transmission lines are neatly arranged and the turns cannot be separated. It is symmetrical and the current intensity is evenly distributed throughout. In addition, it has an end insulation layer rewind mechanism and a transmission line tension mechanism. Computers need to preset various key parameters so that the coil inductance can be performed at once, greatly increasing the level of automation. It will be improved and the labor intensity of workers will be reduced.