It is used to drive the three sets of variable frequency speed regulation system for natural gas compressor. Each system is mainly composed of:

3 induction motors

3 power converters, including:

◆Oil immersed variable frequency transformer

◆ Control system and I/O interface

◆ Cooling device of converter

◆ Options

3 sets of power cable

3 sets of control and signal cable for the equipment room

◆ 5-winding oil immersed transformer for rectifier

◆ For outdoor use

◆ 24 pulse rectifier transformer to reduce no-load loss

◆ High-voltage insulation class LI175/AC128kV

◆Low-voltage insulation classLI240/AC220kV

◆ Insulation class of low-voltage system: LI40/AC10kV

◆ Color of enclosure: RAL7033

◆ Applicable standard DINEN/IEC42504/76

◆ Rated capacity 9600/2x2x2,400kVA

◆ Rated primary voltage 10,000V

◆ Tapping range of adjustment ±2x2.5%

◆ Rated secondary voltage 2x2x2,200V

◆ Frequency 50Hz

◆ Vector group D,y4.75,d5.75,y5.25,d6.25

◆ System cooling: Natural oil cooling and air cooling

◆Sound pressure level (1.0m)57dB(A)

◆ Sound power level (1.0m)72dB(A)

◆Impedance voltage 4xapprox.6.5%

◆ No-load loss 12,500W

◆ On-load loss (75℃)72,000W

◆ Quantity: 3

◆ Cooling method: Water cooling

◆ Ambient temperature 5℃ till 40℃

◆ Altitude max.1,185 ma.s.l.

◆ Relative humidity in operation: Condensation not allowed

◆ Incoming voltage 3/PE10,000V±10%

◆ Frequency 50Hz±2%

◆ Rated converter efficiency 98.5%

◆ Input voltage 2x2x2.2kV

◆ Rated output voltage of converter

◆Rated output current of converter

◆ Pulse count on the input rectifier side: 24

◆Auxiliary power supply plus 20A pre-charging current for 25sec

◆Asynchronous motor

◆ Three-phase induction motor of cage rotor

◆Basic information of the driven device

◆ Driven device SIEMENS–Compressor

◆ Motor power 8,100kW

◆ Motor speed: 1080–1800rpm

◆ Torque in proportion to square of speed

◆ Speed range 1800–1890rpm

◆ Quantity: 3

◆ Manufacturer: Siemens company Loher, in Ruhstorf, Germany

◆ Design, tolerance and manufacturing standards

◆ Operating data (calculated value)

◆ Rated power 8,100kW

◆ Voltage 2×4.16kV

◆ Rated frequency 60.2Hz

◆ Rated current 2×660A

◆ Rated speed 1800min-1

◆ Direction of rotation: Anticlockwise

◆ Oriented to the drive end of motor

◆ Rated torque 43,767Nm

◆ Power factor (P/Pn=1)0.89

◆ Efficiency (P/Pn=1)97.8%

◆ Temperature rise F/B

◆ Connection type: Y/Y

◆ Type of operation cycle S1

◆ Starting method: Variable frequency starting

◆ Speed-torque characteristic: 1M~n², square torque

◆Speed-torque characteristic: 2 within 100%-105%WNn(=1800–1890min-1)

◆ Cooling parameters

◆ Cooling method IC81W

◆ Cooling water inlet temperature: Max. 35°C

◆Cooling water outlet temperature: 42°C

◆ Cooling water flow approx.35m3/h

◆Fouling factor of cooling water ≤0.0001m2K/W

◆ Bearing data

◆ Lubricating method: Forced oil lubrication

◆ Bearing type: Sliding bearing

◆ Oil flow per bearing: 16L/min

◆ Oil type VG46

◆ Bearing end: Cone end

◆ Structure type IM1003

◆ Type of protection II2GExpxeibIICT3(IEC60079-2)

◆ Protection grade

◆ Motor IP55

◆ Terminal box IP55

◆ Operating environment

◆ Operating ambient temperature -33℃ up to 50℃

◆Inlet oil temperature to be pre-heated up to +10℃

◆ 1 set of MV harmonic filter system