Naya Raipur city for 5.6 Lakh population is proposed to be developed in three phases. The estimated power requirement of enter Naya Raipur is of 250 MW in likely to grow in phase on follows.Phase I – The estimate power requirement in Ist phase is 123 MW. To cater this load 1 no 220/132 KV & 2 no 132/33 KV transmission grid, 12 Nos 33/11 KV & 3 no 33 KV switching substation would be establish.
Phase II – The estimate power requirement in 2nd phase in town. To cater this load 1 no 220/132/33 KV & 3 Nos 33/11KV substation would be establish.
Phase III – The estimate power requirement in 3rd phase in 57 MW. To cater this load 1 no 132/33 KV & 3 Nos 33/11 KV substation would be establish.
Power supply up to 132 KV voltage level will be taken through overhead system & up to 33 KV voltage should be taken through underground system. The cables will be taken through underground Pucca trench.
To ensure minimum interruption of power supply, the underground system of 33 & 11 KV will be connected is ring main. All 33/11 KV substation be establish would be indoor type.
The SCADA (Supervisory Control and Date Acquisition) is going to be introducing up to distribution transformer to have online monitoring and control of power supply.
In street lighting we are going to use latest technologies (T-5, LED’s (light emitting diodes) instead of sodium vapours lamps.) We have also proposed solar lighting system for SSB building by installation of solar panel’s on roof of capital complex building except secretariat building. For street light it was also decided to use solar energy for which a solar power plant is going to be establish at kuhera. Installation of solar panel & operation & maintenance will be carried out by CREDA.
Naya Raipur city for 5.6 lakh population is proposed to be developed in three phases. The estimated power requirement by the completion of phase III will be 565 MVA. The calculation is based on :
Average Power Demand of 2 KW per household
Rate of growth of Power demand @ 6.49 % per annum
Power Factor – 0.9
Plant/Substation Load Factor – 0.8
Diversity Factor – 0.6
10.5.1 Development of Power Supply in Phase-I
The estimated power requirement in this phase will be 95 MVA. The power demand can be met by importing power at 33kV voltage level from the nearby sources. 5 nos. 33/11kV substations of capacity 20MVA are to be built in or around the town.
10.5.2 Development of Power Supply in Phase-II
The estimated power requirement for this phase will be 130 MVA. The demand of the already developed Phase-I of the city will increase by 61MVA by the end of completion of Phase-II. The total increase of load by the end of completion Phase-II will be 191 MVA. Total load at the end of Phase-II development will be 286MVA.
It is proposed to build a dedicated 132/33 kV grid substation of capacity 200MVA for the proposed city. Power at 132 kV from National Grid/Chhattisgarh Electricity Board grid will be received at the grid substation and stepped down to 33kV which will further be transmitted to various Sector substations (33/11 kV). 10 number of 33/11kV substations in addition to the already built 5 number in Phase –I will have to be built to cater this increase of load.
10.5.3 Development of Power Supply in Phase-III
The estimated power requirement in this phase will be 155 MVA. The demand of the already developed Phase-I and Phase -II of the city will increase by 124MVA by the end of completion of Phase-III. The total increase of load by the end of completion Phase-III will be 279 MVA. Total load at the end of Phase-III development will be 565MVA.
14 numbers of 33/11kV substations in addition to the already built 15 numbers in Phase –I and Phase-II will have to be built to cater this increase of load.
Therefore the total estimated requirement for the completely developed city will be 565 MVA. Two more 132/33kV grid substation in addition to the one already built Phase-II will have to be built in this Phase of development.
10.5.5 General Recommendations for setting up modern Electrical Power Transmission and Distribution system
The following steps are recommended for improvement in Transmission and Distribution of Power Supply.
i. Power supply for up to 33 kV voltage should be taken through underground distribution system. The cables can be taken through underground duct or simply buried in the ground.
ii. The Proposed Grid stations should preferably be built around outskirts of the city. Power supply at 132kV or above voltage level can be taken through overhead system.
iii. To ensure minimum interruption of Power Supply, 11kV underground distribution system can be connected in Ring Main. It will ensure alternate source of power supply for all substations connected to the Ring Main.
iv. Wherever it is necessary to use overhead transmission (Outside city limit), LT Arial Bunch cables can be used to check power theft.
v. 11/0.433kV substations can be indoor or outdoor type.
vi. Wherever there is space constraints in congested areas, Modern compact packaged outdoor
substations can be used. This type of modern outdoor substation contains Transformer, RMU,
Capacitor and all the Switchgear arrangement in a single compartment. Space requirement for this
type of substation is only 5m x 5m x 4m.
vii. The main receiving stations (Grid Stations) should have the SCADA (Supervisory Control and Data Acquisition) facility to ensure on line monitoring and control of power supply. All substations and distribution stations will be interconnected with controlling stations by using modern methods e.g. Fibre optics. viii.As far as the usage of power is concerned, it is proposed to use energy efficient electrical light fittings and lamps e.g. low power ballasts, low consumption high power luminaries, lux level limiters and timers for street lighting etc. Non-conventional source of energy e.g. solar heaters are
proposed for heating. High masts will be used at road junctions, stadiums, transport hubs, parks and for area lighting. All consumers domestic, commercial, government organisations will be metered.