Talcher–Kolar HVDC system

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The Talcher–Kolar HVDC system, otherwise known as the East–South interconnection II is a 1450 km HVDC transmission connection between the eastern and southern regions in India connecting four states namely Odisha, Andhra Pradesh, Tamil Nadu and Karnataka. The system has a transmission voltage of ±500 kV and was originally put into service in March 2003,[1] with a rated power of 2000 MW. In 2007 the scheme was upgraded to 2500 MW.

Talcher–Kolar HVDC system
Location
CountryIndia
StateOdisha, Karnataka
Coordinates21°06′01″N 85°03′49″E / 21.10028°N 85.06361°E / 21.10028; 85.06361 (Talcher–Kolar HVDC system – Talcher converter station)
13°10′39″N 78°07′00″E / 13.17750°N 78.11667°E / 13.17750; 78.11667 (Talcher–Kolar HVDC system – Kolar converter station)
FromTalcher, Odisha (Eastern Region)
ToKolar, near Bangalore (Southern Region)
Ownership information
OwnerPower Grid Corporation of India
Construction information
Commissioned2003
Technical information
TypeTransmission
Type of currentHVDC
Total length1,450 km (900 mi)
Power rating2000 MW
DC voltage±500 kV
No. of poles2

The Talcher–Kolar HVDC system is owned by Power Grid Corporation of India and the converter stations were built by Siemens.

The scheme is a conventional bipolar system with overhead lines for the high-voltage conductors and ground return for the neutral current.

Block diagram of a bipolar system with ground return

Ground electrodes

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The scheme includes two ground electrodes, of ring construction, located at Rohila, 28.5 km northeast of the Talcher converter station and at Chikkadasarahalli, 30 km northwest of the Kolar converter station.[1]

However, the soil conditions at some distance from the electrode at Chikkadasarahalli were later found to have higher than expected soil resistivity. These geological effects gave rise to problems with DC currents flowing into the neutral connections of transformers at nearby AC substations, which required the addition of DC blocking devices.[2]

Sites

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Site Coordinates
Talcher converter station 21°06′01″N 85°03′49″E / 21.10028°N 85.06361°E / 21.10028; 85.06361 (Talcher–Kolar HVDC system – Talcher converter station)
Rohila electrode station 21°12′11″N 85°19′05″E / 21.20306°N 85.31806°E / 21.20306; 85.31806 (Talcher–Kolar HVDC system – Rohila electrode station)
Kolar converter station 13°10′39″N 78°07′00″E / 13.17750°N 78.11667°E / 13.17750; 78.11667 (Talcher–Kolar HVDC system – Kolar converter station)
Chikkadasarahalli electrode station 13°20′19″N 77°53′49″E / 13.33861°N 77.89694°E / 13.33861; 77.89694 (Talcher–Kolar HVDC system – Chikkadasarahalli electrode station)

References

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  1. ^ a b Nayak R.N., Sasmal R.P., Sen S., Pelly B., Riedel P., Experience with blocking devices during monopolar operation of +/- 500kV, 2000MW Talcher–Kolar HVDC system in India, CIGRÉ session, Paris, 2006, paper reference B4-204.
  2. ^ "What are different types of HVDC links? - Monopolar, Bipolar, & Homopolar link". Circuit Globe. 2016-04-25. Retrieved 2021-08-03.
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