WinTech ® Partial Discharge based "Predictive Intelligence" of insulation system to eliminate power failure risk.
Introduction of partial discharge
Partial discharges (PD) are electric discharges that occur inside the insulation material of high voltage (HV) equipment due to the presence of voids, impurities, or cracks resulting from failures on the manufacturing process, mechanical stress, or insulation ageing process. The PD, which only partially bridges the insulation between conductors, occurs repetitively in a small region, and thus is named partial discharge.
Partial discharges appear as pulses having duration of about few nanoseconds, which leads to frequency range above 1GHz. PD destroys the local insulation structure resulting from insulation degradation, and eventually, in the long-term, it spreads throughout the whole insulation and causes breakdowns of HV equipment. The breakdowns of HV equipment are of ten sudden and catastrophic, causing heavy economical losses and danger.
It is known that PD generates both physical phenomena and chemical changes within the dielectric material. Specifically, PD activity produces sound, light, heat, electromagnetic signals, and chemical reactions. Depending on the type of HV equipment, PD monitor system integrating specific sensors and techniques successfully detect the characteristics of PD activity. It provides an 'early warning' of 'incipient' insulation faults, reminding clients to take preventive measures for effectively minimizing the failure and damages caused by the insulation breakdown of HV equipment.
Partial discharges (PD) are electric discharges that occur inside the insulation material of high voltage (HV) equipment due to the presence of voids, impurities, or cracks resulting from failures on the manufacturing process, mechanical stress, or insulation ageing process. The PD, which only partially bridges the insulation between conductors, occurs repetitively in a small region, and thus is named partial discharge.
Partial discharges appear as pulses having duration of about few nanoseconds, which leads to frequency range above 1GHz. PD destroys the local insulation structure resulting from insulation degradation, and eventually, in the long-term, it spreads throughout the whole insulation and causes breakdowns of HV equipment. The breakdowns of HV equipment are of ten sudden and catastrophic, causing heavy economical losses and danger.
It is known that PD generates both physical phenomena and chemical changes within the dielectric material. Specifically, PD activity produces sound, light, heat, electromagnetic signals, and chemical reactions. Depending on the type of HV equipment, PD monitor system integrating specific sensors and techniques successfully detect the characteristics of PD activity. It provides an 'early warning' of 'incipient' insulation faults, reminding clients to take preventive measures for effectively minimizing the failure and damages caused by the insulation breakdown of HV equipment.
What is Partial Discharge ? | 什麼是局部放電?
In electrical engineering, Partial Discharge is a local dielectric breakdown of a small portion of insulation system, where the electric field
strength exceeds the breakdown point of the insulation material.
在電氣工程中,局部放電是絕緣系統中某一小部分局部電場的強度超過了絕緣材料的破壞點,以致該絕緣介質被擊穿。
Partial Discharge can occur in a gaseous, liquid or solid insulating medium.It usually begins within voids, cracks, or within a solid dielectric such as voids in solid epoxy insulation or within bubbles in liquid dielectrics such as bubbles in transformer oil. Since Partial Discharges are limited to only a portion of the insulation system, which does not constitute a bridge complete continuous discharge, so we called it 'partial' discharge.
在電氣工程中,局部放電是絕緣系統中某一小部分局部電場的強度超過了絕緣材料的破壞點,以致該絕緣介質被擊穿。
Partial Discharge can occur in a gaseous, liquid or solid insulating medium.It usually begins within voids, cracks, or within a solid dielectric such as voids in solid epoxy insulation or within bubbles in liquid dielectrics such as bubbles in transformer oil. Since Partial Discharges are limited to only a portion of the insulation system, which does not constitute a bridge complete continuous discharge, so we called it 'partial' discharge.
IEC 60270:IEC Standard for pulse current measuring methods of PD | ||
IEC 62478:IEC Standard for on-line PD measuring methods |
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