PA-9 Series COMPONENT FAILURES Application Guide

PublishTime：2022-07-21

●Component Failures: When referring to component failures we are referring to fuses blowing, surge protectors failing, automatic transfer switch failures, cables switch gear, CT’s or PT’s etc. The failure of these components can be due to transients. Transient voltages caused by lightning or switching operations can result in degradation or immediate dielectric failure in all classes of equipment. High magnitude and fast rise time contribute to insulation breakdown in electrical equipment like rotating machinery, transformers, capacitors, cables, CT’s, PT’s and switchgear. Repeated lower magnitude application of transients can cause slow degradation and eventual insulation failure, decreasing equipment mean time between failures.
●Another cause of these failures can be voltage swells. An increase in voltage applied to equipment above its nominal rating may cause failure of the components depending upon the frequency of occurrence. Electronic devices, including adjustable speed drives, computers and electronic controllers may show immediate failure modes during these conditions. However, transformers, cable, bus, switchgear, CTs, PTs and rotating machinery may suffer reduced equipment life over time. A temporary increase in voltage on some protective relays may result in unwanted operations while others will not be affected. Frequent voltage swells on a capacitor bank can cause the individual cans to bulge while output is increased from the bank. The visible light output from some lighting devices may be increased during a temporary swell. Clamping type surge protective devices (varistors or silicon avalanche diodes) may be destroyed by swells exceeding their MCOV rating.
●Common Causes: Some common causes of transients include lightning, load Switching, capacitor switching or loose wiring/arcing. Some common sources of Swells include source voltage variations and loads dropping out.

Brand of Product：	Megger
Part#：	PA-9 Series 、 PA-9 More Part#
Product Category：	More
Application：	More
Data Type：	Solutions More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2008/2/5
Version Number：	V02
Data Encoding：	PA9_14_AG_En_V02
Data Size：	78 KB

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