Purpose of inductor
An inductor prevents sudden change in current magnitude. It is installed in substations to:
ground faultcurrent entering the power system through transformer neutral. Read more.
- Limit in-rush currents associated with the energization of capacitor banks.
- Limit all variations of fault current 3-ph, L-G, L-L-G, etc. when tied in series on a line.
- On extremely long EHV transmission lines, the Ferranti effect is prominent. An inductor tapped off the t-line negates this effect (the leading vars generated on the long line is consumed by a shunt inductor.)
- Filter out harmonics (when used in conjunction with capacitor and resistor). Inductors are also implemented on other Flexible AC Transmission devices.
Cost of inductor:
- 15kV 800A neutral air core inductor (1 unit): ~$5,000
- 15kV 450A series air core inductor (3 units): ~$15,000
- 34kV 1000A series air core inductor (3 units): ~$60,000
- 138kV 600A series air core inductor (3 units): ~$60,000
- 345kV 120,000KVAR shunt air core inductor (3 units): ~$150,000
Lead time to procure inductor:
- ~20 weeks for medium voltage units
- ~30 weeks for HV & EHV units
Information on cost and lead time is for your general knowledge only. Contact vendor with your equipment specifications for actual figures.
Learn details of other major equipment
Attempt the quiz