The document provides information about Noida Metro Rail Corporation Limited (NMRC). It discusses that NMRC is a joint venture between the governments of India and Uttar Pradesh. The metro line connects Noida and Greater Noida, with 21 stations along the 29.7 km route. It then provides details about the electrical department, including the power distribution system, auxiliary power system, traction power system using 25kV AC overhead lines, and train configuration with pantographs and other electrical equipment. Battery configurations and workshop power supplies are also summarized.

1. Anand Mohan
Lloyd Institute of Engineering
Technology Greater Noida U.P.

2. Noida Metro Rail Corporation
Limited Internship

3. Noida Metro Rail Corporation Limited (NMRC) is a company incorporated under the provisions
of the Companies Act 2013, having its registered office at Block- III, 3rd Floor, Ganga Shopping Complex,
Sector 29 Noida 201301.
INTRODUCTION OF NMRC
The Noida Metro is a rapid transit system connecting the twin cities of Noida & Greater Noida in
Gautam Buddha Nagar, Uttar Pradesh, India.
NMRC is a Joint venture company of the Government of India and the Government of Uttar
Pradesh.
The NMRC has opened its corridor covering the length of 29.707 KM between Noida and Greater
Noida and operational since 26th January 2019. The stretch consists of 21 stations, of which 15 are in
Noida and 6 in Greater Noida.
The line starts from Noida Sector 51 metro station and will run through sectors 50, 76, 101, 81,
NSEZ, 83, 137, 142, 143, 144, 145, 146, 147, and 148; after this, it will enter Greater Noida and will go
through Knowledge Park-II, Pari Page | 3 Anand Mohan (Lloyd Institute of Engineering and Technology
Greater Noida, Uttar Pradesh) Chowk, Alpha-1, Delta-1 and GNIDA office before terminating in Depot
Station.

4.  The train is 4-car consist, including 2 motor cars & 2 trailer cars.
 If necessary, in the future, the train can be extended to a 6-car, including 3 motor cars & 3 trailer cars.
 TRAIN CONFIGURATION & LAYOUT:-
• 4-car train consist:- DT*M+M*DT
• 6-car train consist:- DT*M+M*T+M*DT
OVERVIEW OF A METRO
M M DT
DT
T
M M
DT DT
M
Note:-
 DT: is a trailer car with a Driver’s cab and
pantograph.
 M: is a motor car.
 T: is a trailer car with a cab and pantograph

5. INTRODUCTION OF THE ELECTRICAL
DEPARTMENT IN NMRC
POWER SYSTEM (TRACTION):-
The primary function of the auxiliary power system is to transform the AC373V power from the
main transformer to AC415V 50Hz, AC230V 50Hz, and DC110V. The converted power is used to supply
the air conditioner, air compressor, oil pump of the main transformer, lighting system, TCMS, signal
system, and control circuit..
THE POWER SUPPLY NETWORK OF THE AUXILIARY SYSTEM INCLUDES:-
 Auxiliary converter outputs alternating current of 3-phrase 415V single-phrase 230V, 50HZ.
 The battery charger outputs 110V DC.
 Medium voltage bus (3-phrase 415V AC, 50Hz).
 Bus line isolation contactor- It will be opened when there is a short circuit in a medium-voltage bus.
 Battery, 260Ah, Ni-cd battery.
 Workshop Power Supply.
 Low voltage bus (110V DC).
 Low voltage box.

6. BATTERY CONFIGURATION:-
 There is one group of batteries on each M car. Every group of batteries has 90 cells combined with 80
real cells and 10 false cells (only cell box, upside down installation, not connected to battery circuit
and water filling system). Arrangement of half group of battery as follows.
CONFIGURATION OF WORKSHOP POWER SUPPLY:-
 The workshop power supply includes AC 415V power supply socket and an AC 230V onboard outlet
socket. In the case of vehicle maintenance, if there is no AC 25KV high voltage power supply, it can still
maintain the vehicle.
 When the AC 25KV high voltage is not available, the maintenance personnel can provide the power to
the auxiliary electrical equipment in a unit (DT*M) by the AC 415V power supply socket.
 When the high voltage is not available, but AC 415V is available, the maintenance staff can provide
power for single phase load by the AC 230V socket, single phase load mainly includes cleaning
equipment, mobile phones, and laptops. When the train has AC 25KV high voltage, the AC 230V socket
can also be used. USB is also provided to meet the needs of passengers to charge their phones.
INTRODUCTION OF THE ELECTRICAL
DEPARTMENT IN NMRC

7. INTRODUCTION OF THE ELECTRICAL
DEPARTMENT IN NMRC
Item DT M M DT
AC 415V
Workshop power
supply socket
2 0 0 2
AC 230V outlet
socket
4 3 3 4
USB 3 2 2 3
FLEXIBLE OHE SYSTEM AT NMRC:-
Three-phase Power supply is received from discoms at 220/132/110/66 kV. Stepped down to
25 kV single phase at Receiving substations. Fed to Feeding Posts located at viaducts through cables.
Feeding posts are generally spaced at 10-15 km. RSS is isolated with the neutral section at Sectioning
Posts for phase separation.

8. GENERAL CONCEPT OF 25KV OHE SYSTEM
SECTIONING:-
 The overhead equipment is divided electrically into sections using neutral sections, insulated overlaps,
and section insulators.
 Under normal working conditions, electrical continuity is maintained by bridging the insulated
overlaps using interrupters or isolators.
 Isolation of small sections of OHE for maintenance and repairs is possible.
SWITCHING STATIONS (SP):-
 At the Neutral section, a Sectioning and Paralleling post (SP) is created.
 Under any emergency requirement, the power supply of the adjacent substation may have to be
drawn to the other (substation) section. This is done through Bridging.
 Bridge Interrupters normally have to be OPEN.
 Sectioning & Paralleling Interrupters are normally kept close.
 Depending on the distance between an FP and SP (Feeding post to a Neutral section) 2 or 3 Sub
sectioning and Paralleling posts are created.
 Paralleling interrupters are provided at SSP and SP to parallel the Up & Down track OHE, to reduce the
voltage, drop, and facilitate movement of traffic in case one subsector or one or more elementary
section is faulty or taken up for maintenance.

9. GENERAL CONCEPT OF 25KV OHE SYSTEM
NEUTRAL SECTION:-
 To segregate the power supply of feed from two different Substations having a phase and voltage
differences, neutral sections are provided in OHE in between the two substations.
COMPONENT OF OHE:-
 Mast/Structure,
 Cantilever Assembly,
 Wires (Messenger Wire, Contact Wire, Return Conductor, Jumpers Wire, Messenger Wire),
 Section Insulators,
 Automatic Tensioning Devices (ATDs)(BWA type, Gas Type, Spring Type).

10. OVERVIEW OF TRAIN CONFIGURATION
Equipment Location
Quantity
DT M M DT
Pantograph (PAN) Roof 1 / / 1
Lightning arrester (LA) Roof 2 / / 2
Potential transformer (PT) Roof 1 / / 1
Vacuum circuit breaker (VCB) Roof 1 / / 1
Earthing Switch (EGS) Roof 1 / / 1
Current transformer (CT) Underframe 1 / / 1

11. LAYOUT OF TRACTION / PROPULSION EQUIPMENT FOR 750V DC THIRD RAIL
RSS Power
Transformer
66kV /33kV
Traction Motor
180 KW
Transformer
66kV
Rectifier AC to
DC 750V DC
Rectifier
Transformer 33
kV / 292V
/33kV
Inverter 3phase,
VVVF V,0-500 F,
0-137Hz
RSS TSS
RSS/TSS Located Near Station Area App. Area 2000Sq Meter
Propulsion Equipment’s located Inside Train Area
LAYOUT OF TRACTION / PROPULSION EQUIPMENT FOR 25kV AC TRACTION SYSTEM
RSS Power
Transformer132/25kV
Traction
Motor 220 KW
Transformer
66kV
Converter Unit AC to
DC 1900V DC
Main Transf. Ac to DC
25kv/1058V
Inverter 3phase, VVVF
V,0-1400 F, 0-137Hz
RSS/ TSS TSS
RSS/TSS Located Near
Station Area App. Area
2000Sq Meter
Propulsion Equipment’s located Inside Train Area

12. VOLTAGE LEVELS OF TRACTION SYSTEM IN NMRC:-
 Incoming : 132 KV AC
 For Traction : 25 KV AC
 For Auxiliary loop : 33 KV AC
 For Station Utilization : 415 V AC
RSS
I/C Supply
132 KV AC
O/G 25KV AC Station ASS
Traction Supply O/G 33 kV Auxiliary Loop
LT Supply for
Auxiliary Loads
33 kV/415V
Transformer

13. POWER DISTRIBUTION SYSTEM
HT Panel 33KV
To Next Station
Transformer 1
(Delta Star) 33KV/415 V
MDB (Main Distribution Board)
At 415 V
RSS1 or RSS2
Transformer 1
(Delta Star) 33KV/415 V
From here the scope of
E & M i.e. LV system
begins

14. LOAD CLASSIFICATION
 Power Supply to various systems and subsystems discussed is classified as:-
 Emergency:– A type load (Loads with UPS, DG & ASS Backup Supply).
 Essential:- B type load (Loads with DG & ASS Backup Supply).
 Semi Essential:– C type load (Loads with Only ASS Backup).
 Normal:- D type load (Normal Loads).
MDB (2/3 Logic)
LVCB1 LVCB2
BC
WPP FPP ESPP EPP MLP ACPP PAP
S&T
UPS
PSG UPS
MAIN DISTRIBUTION SYSTEM

15. EPP (ESSENTIAL POWER PANEL)
EPP
(Essential
Power Panel)
DG AMF
PANEL
MDB
LVCB1
MDB
LVCB2
AC / DC DB PSI
DEPARTMENT
PSG
UPS
X-RAY
MACHINE &
DFMD
S & T
UPS
LIFTS
EMLP
(Emergency
Lighting Panel)
Isolation
Transformer 1:1
Delta Star
UPS of S & T
department
Escalator
RMS panel
in SCR
FACP (At all 21
stations) & wind
Sensor (only at 5
Stations)
LIFT RMS
panel in SCR
Type 2 DBs
Emergency
feeder
EMLP (EMERGENCY LIGHTING PANEL)
I/C-1 I/C-2 B/C Remark
ON OFF ON In normal condition, I/C-1 has been given priority.
OFF ON ON In case of failure of I/C-1, I/C-2 has been given 2nd priority.
ON ON OFF Can be achieved to service the B/C ACB.
INTERLOCKING SCHEME

16.  UPS Operation:-
 2 nos. UPS of 30/60 KVA are provided for the station.
 When the mains supply gets failed, the load gets shifted to the batteries without any interruption.
 Both UPS share load equally in normal operation.
 In case one UPS gets switched OFF, the load gets transferred to the second UPS.
UPS SYSTEM
AC
DC AC
DC
Battery
To Load
Maintenance Bypass
Static Bypass
Mains
Rectifier Inverter

17. SOLARPANELSANDINVERTERS
 Total of 10003 kW of the solar plant is installed on the NMRC network.
 Solar modules are installed at the roof level of stations, the parking area at sec 51, RS depot.
 Solar inverters are installed at the Mumty level of Stations.
 Solar Panel is available in ASS of stations.
 Solar energy is utilized at the station and the remaining is Fed back to the grid through the
transformer.
DIESEL GENERATOR SET
 Provides backup to essential loads like Fire pumps, PSG, X-rays, Lifts, etc.
 125 KVA DG sets are installed at all stations except Sec 51, sec 142, Sec 144, and Depot Station.
 These 4 stations (Sec 51, sec 142, Sec 144, and Depot Station) have 160 KVA DG sets.
 RS depot has 2 no. Of 750 KVA DG sets.
 The backup is automated i.e., as soon as both the supplies fail, DG gets an ON command & supplies
power to essential loads.
 At stations DG also provides backup to Fire Pump Panel.

18. Thank You