HVDC Rihand–Delhi

The HVDC Rihand–Delhi is a HVDC connection between Rihand and Dadri (near Delhi) in India, put into service in 1990. It connects the 3,000 MW coal-based Rihand Thermal Power Station in Uttar Pradesh to the northern region of India. The project has an 814 kilometres (506 mi) long bipolar overhead line. The transmission voltage is 500 kV and the maximum transmission power is 1,500 megawatts. The project was built by ABB.

HVDC Rihand–Delhi
Location
CountryIndia
StateUttar Pradesh
Coordinates24°01′13″N 82°47′21″E
28°35′36″N 77°36′16″E
FromRihand
ToDadri, near Delhi
Ownership information
OwnerPower Grid Corporation of India
Construction information
Installer of substationsABB, Bharat Heavy Electricals Limited
Commissioned1990
Technical information
Typeoverhead line
Type of currentHVDC
Total length814 km (506 mi)
Power rating1,500 MW
DC voltage±500 kV
No. of poles2

On 24 June 1990, during the commissioning of the scheme, a complete quadrivalve of the Rihand converter station was destroyed, and the other two quadrivalves of the same pole badly damaged, by a fire which is believed to have started as a result of a loose connection on a grading capacitor. The fire was so intense that the valve hall was structurally damaged, and the affected converter was out of action for 18 months. Similar incidents on the Itaipu project in 1989 and the Sylmar Converter Station of the Pacific DC Intertie scheme in 1993 led to CIGRÉ publishing guidelines on the design of thyristor valves in order to reduce fire risks.[1] In 1996 the National Fire Protection Association published NFPA 850{2} to further enhance fire prevention and protection guidelines base on input from the HVDC manufacturers and utility owners. Since that time, there have been no catastrophic fire incidents in the US or internationally.

HVDC Rihand-Dadri crosses north of E. Manjhpati the HVDC Ballia-Bhiwadi. This is the first crossing of two independent HVDC lines in India and one of the few worldwide.

Sites

SiteCoordinates
Rihand Converter Station24°01′13″N 82°47′21″E
Chak Chapki Grounding Electrode23°58′17″N 83°0′56″E
HVDC Rihand-Dadri crosses HVDC Ballia-Bhiwadi27°22′36″N 78°52′45″E
Dadri Converter Station28°35′36″N 77°36′16″E
Nanva Ka RajPur Grounding Electrode28°22′0″N 77°33′22″E

References

  1. Fire aspects of HVDC thyristor valves and valve halls, CIGRÉ Technical Brochure No. 136, February 1999.

2. NFPA 850-2020, Recommended Practice for Fire Protection for Electric Generating Plants and High Voltage Direct Current Converter Stations


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