Trouble Shooting Directory for Three Phase Locomotives - eLocoS

INDIAN RAILWAYS
Driver's Manual for WAG9
System Description
8.3 Resistor harmonic filter
8.4 Capacitor bank harmonic filter
9 Surge arrestor
10 Earth return brush
11 Earthing choke
12 Valve set 2*ZV
12.3 Pre-charging contactor of converters
12.4 Contactor converter
13 Valve set ZV + MV
14 Pre-charging resistors of converters
15.1 Resistor of over voltage protection unit
15.3 Series resonant circuit choke
15.4 Capacitor bank of series resonant circuit
15.5 Capacitor bank of DC-link
15.82 Earthing switch of DC-Link
20 Traction motors
3.3.1 General Description
Due to technical and economical reasons electric traction vehicles are nowadays
provided with three-phase asynchronous traction motors. The three-phase
voltage required for operating the traction motors is generated on the vehicle by
means of the traction converter connected between the vehicle‟s main
transformer (single phase) and the traction motors.
The traction converter allows the train not only to drive but also to brake
electrically. To control the tractive or braking effort, and hence the speed of the
vehicle, both the frequency and the amplitude of the three-phase converter
output voltage are continuously changed according to the demand from the
driver‟s cab. This allows continuous adjustment of the driving or braking torque of
the traction motors, which means that the driving speed changes smoothly.
When braking electrically the traction motors act as generators. In the converter
the resulting three-phase electrical energy is converted into single-phase energy
which is fed back into the line (recuperation brake).
Output voltage of the Traction converter 2180 V
Output current
831 A
Output power
2365 kW
89.4 An earth fault detection is integrated at the output of the Line converter.
CHITTARANJAN LOCOMOTIVE WORKS
Ident. No. 3EHW411172 Ver-1 Chap. 3, Page - 16