Oil India Limited operates various drilling and workover rigs for oil exploration. It has 11 drilling rigs of varying horsepower, including 8 AC SCR rigs and 2 variable frequency drive (VFD) rigs. It also has 12 workover rigs and various charter hired rigs. The document discusses the electrical equipment on the VFD rigs, including large induction motors for equipment like the draw works and mud pumps. It provides an overview of the advantages of VFD rigs like high power factor, precise speed control, and energy efficiency. Single line diagrams are shown to illustrate the basic circuitry of components like the main transformer, isolation transformers, diode supply units, and inverter units.

1.  Induction Visit
 Rig Section
 Electrical Equipment in VFD Rig
 VFD Rig System
 Advantages
 Single Line Diagram

2. Activities:-
 Maintenance of rig electrical equipment.
 Provide services for safe movement of rig equipment.
 Provide electrical services for procurement of new rig
equipment.
 Procurement of spares for rig electrical equipment.
 Provide services for charter hired rigs.
 Rig electronics laboratory for calibration, testing of various
electronics components/parts.
 Rig workshop for overhauling of drilling motors, alternators
etc.

3. Oil India Limited has –
 11 drilling rigs(1 used for WI well rig)-
◦ 8 (6 nos.-1400HP, 1nos.- 2000HP, 1nos.-3000HP) AC SCR
◦ 2 VFD rigs(2000HP)
◦ 1 Mechanical rig(750HP)
 12 workover rigs
 6 Charter hired drilling rigs
 13 Charter hired work-over rig

4. Motor Loads
 Draw Works 1150 hp
 Top Drive 2×400 hp
 Mud Pumps 1150 hp
 Rotary Table 1150 hp
 415 V AC Induction
Motor (Agitators/SC/Solid
Control/WB/Air Compressor)
Transformers
 Main Transformer (1250 kVA )
 Isolation Transformers (100
kVA)
 Lightening Transformers (2×80
kVA )
Others
 Diode Supply Units
 Inverter Units
 Brake Units

5. Modes in VFD

6.  High power factor
 Full torque at zero speed
 Precise and accurate control of speed variations
 Energy Efficiency
 Increase reliability and backup redundancy
 Lesser Maintenance requirements
 Soft Starting

8. 0-2000kW
0-2000 kVA
ENG1
GEN1
CAT351
2B1310
kW
1500RP
M
1900 kVA
600V/ 50
Hz
Є AC
CONTR
OL
MODUL
E
kW
kVAR
A
0-2000A
Є
Э
ENG1
GEN1
CAT351
2B1310
kW
1500RP
M
1900 kVA
600V/ 50
Hz
Є AC
CONTR
OL
MODUL
E
kW
kVAR
A
0-2000A
Є
Э
ENG1
GEN1
CAT351
2B1310
kW
1500RP
M
1900 kVA
600V/ 50
Hz
Є AC
CONTR
OL
MODUL
E
kW
kVAR
A
0-2000A
Є
Э
ENG1
GEN1
CAT351
2B1310
kW
1500RP
M
1900 kVA
600V/ 50
Hz
Є AC
CONTR
OL
MODUL
E
kW
kVAR
A
0-2000A
Є
Э
0-2000kW
0-2000kW
0-2000kW
0-2000 kVA
0-2000 kVA
0-2000 kVA

9. Basic Circuit Diagram of DSU
Supply Transformer
DSU Module
Six Pulse Connection

11. MCCB
Thermal
Relay
M
Control
Circuits
MCCB
Thermal
Relay
M
Control
Circuits
MCCB
Thermal
Relay
M
Control
Circuits
R
Y
B

12. THANK YOU