POWERGRID Network POWERGRID is operating and maintaining 124 Nos.

Substations and 73000 ckt.km EHV Transmission Lines.

There are about 360 Nos. Power Transformers with Transformation Capacity of about 82000MVA.

POWERGRID is consistently maintaining system availability of more than 99%.

The Power System availability, security and reliability are of utmost importance for sustainable growth of Indian Economy.

Hence, it is be ensured that Transmission system is healthy and system availability is maintained more than 99% for all times.

Effect of Natural Disasters and other calamities on Transmission System

As disasters like Earthquake, Cyclone, Tsunami, fire in Substations, terrorist attacks, fire in Transformers etc. may seriously affect Power Systems availability and security, necessitating taking mitigating measures for meeting above eventualities by the Central Transmission Utility of the country.

For International events like Commonwealth Games, World cup events etc. such emergency restoration systems may be helpful in case of any mishap or eventualities.

POWERGRID has also played vital roles in quick restoration of power supplies in case of Cyclone in Orissa, Earth quake in Gujarat and heavy Snow fall in Kashmir Valley and many more. However, there is still need to take mitigating measures for the following eventualities/ disastersTerrorist attacks & SabotageNatural DisastersFire/Failures of Power Transformers/SubstationWarTemporary increase in Substation Capacity

Disaster Management in POWERGRID

Requirement of Mobile Station

Unlike the transmission line ERS, there is no quick restoration means in sub-stations for the power transformer to cater to a requirement arising out of following eventualities:

Disasters damaging Substation/ prolonged power transformer outages

Failure of transformer requiring immediate replacement

Planned transformer outages for internal Inspection /Maintenance outages under system constraints requiring alternate transformer to take loads for such periods.

Mobile Station

Typical Connection arrangement

Mobile station Worldwide Bonneville Power Authority, USA is using Mobile

Stations upto 100MVA and 245kV ICE, Costa Rica- 220/13.8kV, 30MVA SCECO East, Kingdom of Saudi Arabia-

115/34.5kV, 30MVA HVPN has recently procured 2Nos. mobile

substations (1 No. 132 kV& 1 No. 66kV) TRANSELECTRICA, Romania, 220kV TECHNOPROMEXPORT, Russia, 115kV RENCO, Iraq, 132kV ELEKTROVOD, Slovakia, 123kV

Typical Arrangement in 400/220kV Substation

Case-ICase-I

Single Line Diagram of 400/220kV Substation Single Line Diagram of 400/220kV Substation when there is failure of Transformerwhen there is failure of Transformer

Case-IICase-II

To feed an existing substation of SEB through To feed an existing substation of SEB through LILO of 400kV LineLILO of 400kV Line

Case-IIICase-IIITo feed a new upcoming load CentreTo feed a new upcoming load Centre

In case, where 220kV Substation is not existing and 400kV In case, where 220kV Substation is not existing and 400kV and 220kV Lines are passing nearby, the power can be and 220kV Lines are passing nearby, the power can be transferred through LILO of both the 400kV and 220kV Linestransferred through LILO of both the 400kV and 220kV Lines

BOQ of the proposed System

3 X 105 MVA, 420/220kV Power Transformers 400kV GIS Module (3nos.) 220k GIS Module (3 nos.) Control and Protection system 400 and 220kV Cables Auxiliary power supply

Issues to be debated

Proposed Location of Mobile Station- NCR Budgetary prices (ABB proposal for Rs.120.95

Crores):

Mobile Transformer 3X 117 MVA, 400/220kV 96.2 Crores

2 nos. 400kV GIS bays 22.8 Crores

Training 0.21 Crores

Spares 1.74 Crores

Issues to be debated (Contd…)Proposed Methodology for cost recovery:• One time cost under disaster management system

under GOI grant• Cost recovery through Transmission tariff after

agreement in RPCs• O&M expenditure

Thank you For Kind Attention…