1. Welcome

2. NIA-MTDC Power Supply SystemBy
Dhritiman Nath, ET
Trainer
L.Nilling & G.Patgiri

3. NIA-MTDC power supply Arrangement and it’s proposed modification
Contents
Introduction
Power supply schemes
NIA-MTDC power supply Arrangement and it’s proposed modification

4. Introduction
Power is transmitted and distributed by the distribution network.
The system has both H.T. and L.T. networks for distribution of power.
33 KV
11 KV H.T. voltage
3.3 KV
415 V L.T. voltage

5. Continued…. Power is supplied to various OCS,GCS installations.
Within OIL township , it distribute the power to places like RCE office , Bihutoli , R&D ,Oil market , Zaloni club etc.
Power is also supplied for area lighting , street lighting with in OIL township.
It has a total of 103 no of sub stations.

6. Continued….
The network uses both overhead lines as well as underground cables for power distribution.
Currently , approximately 70 KMs of overhead lines are being used for power distribution.
The network is supplying power to areas within a radius of 20 KMs from Duliajan.

7. Power supply schemes
To provide power to various installations which are not within a close range, we are using a 33 KV ring.
This ring includes sub-stations like –
OCS 2
OCS 3
PONTOON
WELL 80
Loads drawn from this ring –
OCS – 8
GCS -8
GCS-6
OCS-6
OCS-1 etc.

8. 33 KV RING 11/33 KV SWITCHYARD W-208 GCS8 OCS8 SS-C OCS 3 OCS 2 SS-A
OWS
SS D
MP7
NWS
GCS-6
WELL 80
PONTOON
W-240
W-254
NEW PONTOON
OCS -6
OCS-1
GCS 1B
C GROUND
South bank

9. 3.3 KV ring constitute the DOMESTIC RING MAIN
This ring includes the following sub-stations –
SS-1
SS-2
SS-3
SS-4
Various loads drawn from this ring are –
VIP’s Bungalow
Zaloni club
Duliajan club
Zaloni guest house
Medical
Bihutoli
Qtrs etc

10. 3.3 KV RING POWER HOUSE W-53 GCS-5 BIHUTOLI SS-1 SS-5 MEDICAL SS-4
GUEST HOUSE
SS-2
SS-3

11. Power is also supplied with 11 KV ring.
This ring includes various sub-stations like –
SS ‘D’
DPS SS
GCS -4
OCS -4/SS-E
We also have some radial 11 KV feeders –
Tingri feeder
LPG
SS-6
Various loads are –
MTDC
NIA
RCE office
Qtrs/B’lows/schools/Oil Market/SBI/Industrial Area

12. 11KV RING MTDC SS-7 SS-E NIA W203 SS-6 GCS4 NIAN G NIAC LPG PH
11/33 KV Switch yard
W21
DPS D
W57
DNPL
W50 DD SS
TINGRI
SS B
BBARI
GCS5
TDX DX

13. NIA- MTDC power supply system and it’s proposed modification
MTDC sub-station is fed from one feeder only.
Fault occurrence is high in this feeder.
Alternate supply source is required to maintain power reliablity in MTDC area.

14. Schematic diagram of NIA-MTDC
4 WAY RMU
To SS E
DDPS-E feeder
NIAC NIAN
NIA
3 WAY RMU
MTDC feeder
DPS
3 WAY RMU
MTDC

15. Recall Introduction to transmission and distribution section
Power supply schemes
NIA-MTDC power supply system and it’s proposed modification

16. Thank you