• No.2, First Floor,8th
    Street,Nandanam Extension,
    Chennai - 600035
  • No.1073,15th Cross,
    30th Main, Banashankari
    2nd Stage, Bengaluru
  • Monday - Saturday
    9:30am - 6:30pm
    Sunday CLOSED

Sources of switching surges

  • Home
  • .
  • Sources of switching surges

It is a known fact that Lightning surges are more destructive than switching surges but data shows that malfunctions & premature failures of sensitive electronic and electrical equipment occur much more as a result of switching surges than lightning surges due to the fact that there are many sources of switching surges.


It is to be noted that the incidence of lightning and lightning induced surges is lesser in western parts of India as compared to eastern parts of the country. Also, in spite of installation of various types of protective devices, failure of such devices happens very frequently.


Proper selection and installation technique of SPDs is the only solution to protect your equipment against these switching surges.


There are many sources of switching surges. Most common ones are listed below,


1. High voltage switching from Utility side (Electricity Boards)


2. Capacitor bank switching


3. Welding


4.Transfer from EB to DG & vice versa. (there is no BUMPLESS transfer, practically)


5. Transmission line switching


6. CCVT- Coupling Capacitor Voltage Transformer


7. GIS


8. VIS


9. Ground voltage differences


10. CT


11. Electro-mechanical equipment


12. SCR


13. Digital logic circuits (SMPS, Printers, unshielded cables viz flat ribbon cables)


14. DC control circuits


15. Mechanical vibration


16. Chemical contamination


17. ESD via human touch


18. Cable resonance


19. Reflections & travelling waves


20. Power circuit in-rush currents


21.Other Incidental sources such as on load tap chargers, corona discharge from HV transmission lines (which travel several kilo-meters from the point of generation by propagating along the line) etc.


Contact us for expert solution to protect your sensitive electronic equipment close to their MTBF levels against the disturbances caused by any one or combination of the above-mentioned sources.


As this is a very specialized and sensitive subject, proper Selection and Installation of SPDs are very important to ensure trouble free operation for many years.