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1200 kv UHVAC technology

World’s Highest transmission voltage

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Introduction

To develop 1200 kV AC Transmission System and associated equipment indigenously, a joint initiative is taken by POWERGRID, CPRI and Equipment Manufacturers to set up a 1200 kV Testing Station and an experimental line at BINA in Madhya Pradesh.

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HOW POWERGRID PLAYS AN IMPORTANT ROLE POWERGRID plays a significant role in socio-

economic development of the country and in pursuing clear objective of transmitting power across the country

In a bid to further boost the transmission capacity of the country, India has moved towards Ultra High voltage (UHV) transmission level.

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Voltage Upgradation

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WHY WE ARE GOING TO 1200KV TRANSMISSION

Table 1Description 400kv 800kv 1200kv

ROW(m) 46 64 92

Capacity(MW)

600-700

2500-3000

6000-8000

MW/m 15 45 87

Need for UHV voltage level to transmit power over large distances was always felt.

Table I gives he comparison of Power transfer capability (MW/m) for transmission voltages in India.

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  Test Station Details

•Two 1000 MVA 1200/400/33 kV Auto Transformers•Two 1200kV & 400kV Bays •One 1200kV line Single Circuit (about 1.1 Km long)•One 1200kV line Double Circuit Line (about 0.8 Km long)

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DOUBLE CIRCUIT TOWERSINGLE CIRCUIT TOWER

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Series Capacitor installation

Series capacitors are installed to reach more efficient use of the transmission lineThe series compensation is an economic method of improving power transmission capability of the lines

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1200 kV National Test Station Establishment of 1200kV UHVAC Test

Station at Bina in association with 33 domestic manufacturers

For indigenous development of 1200KV technology

Indigenous development of equipments shall help in

To conduct development atleast to optimize design of substation and transmission equipments.

Indigenous development shall help in reduction of cost and convenience of O&M

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1200kV Transformer successfully developed, tested and commissioned.

Test Setup for 1200kV Transformer 1200kV Transformer successfully tested

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1200kV Test Station

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1200kV Test Station The initial operational experience of 1200kV Test Station will prove to be

the corner stone of future commercial projects India’s first 1200kV UHVAC Transmission Line from Wardha to

Aurangabad is already under construction

Parameters

Italy

Russia Japan China India

Highest

Voltage

1050 kV 1200 kV 1100 kV 1100 kV 1200 kV

Nominal

Voltage

1000 kV 1150 kV 1050 kV 1000 kV 1150 kV

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Bundle Conductor Selection

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PGCIL carried out these tests in a Corona cage at UHV test lab at CPRI, Hyderabad. Octagonal Bersimis ACSR (Die 35.1mm) bundle conductor was chosen. Three types of bundle arrangements. with different sub conductor spacing of 350 mm. 450 mm and 550 mm were adopted.

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1200kV Wardha-Aurangabad Line It’s India’s first 1200 kV UHVAC Transmission Line –

400kV Double circuit line upgradable to 1200kV

Towers and Foundations are designed considering 1200kV parameters

Tower designs are suitable for operation of two circuits of 400kV

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1200KV Transmission Corridor

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Challenges in 1200kV TransmissionHandling very huge amount of Power transfer (6000-8000MW)

Reactive Power management

Large size of equipments

Transport Limitations

Cost Optimization

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Conclusion: According to my view, India has quite an

experience in 11 kV to 420 kV systems. But in 800 kV AC system, it has only limited exposure. In this context, the Power Grid was in the forefront of indigenously developing a 1200 KV UHV electrical transmission system. The UHV transmission system, would go a long way in helping to conserve the right of way (as it would replace three 400 kV transmission lines).

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