Partial discharge (PD) is evidence of a degrading insulation system, which could trigger costly repairs and predictively cause an electrical breakdown of any high-voltage apparatus.
Although PD may be small in size, it can certainly deteriorate insulation over time. Ultimately, it will lead to a system failure. If this condition is left unchecked, the insulation failure may result in not just a loss of supply to processes or customers, but it may also endanger staff members.