HVDC Rihand–Delhi

HVDC Rihand–Delhi
HVDC Rihand–Delhi
Location
Country	India
State	Uttar Pradesh
Coordinates	24°01′13″N 82°47′21″E; 28°35′36″N 77°36′16″E
From	Rihand
To	Dadri, near Delhi
Ownership information
Owner	Power Grid Corporation of India
Construction information
Installer of substations	ABB, Bharat Heavy Electricals Limited
Commissioned	1990
Technical information
Type	overhead line
Type of current	HVDC
Total length	814 km (506 mi)
Power rating	1,500 MW
DC voltage	±500 kV
No. of poles	2

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.

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

Site	Coordinates
Rihand Converter Station	24°01′13″N 82°47′21″E
Chak Chapki Grounding Electrode	23°58′17″N 83°0′56″E
HVDC Rihand-Dadri crosses HVDC Ballia-Bhiwadi	27°22′36″N 78°52′45″E
Dadri Converter Station	28°35′36″N 77°36′16″E
Nanva Ka RajPur Grounding Electrode	28°22′0″N 77°33′22″E

References

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

External links

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