GE  151X1215DK01PC01  Signal Processing / Amplification Board

GE  151X1215DK01PC01  Signal Processing / Amplification Board

Cooling System Cabinet

The cooling system cabinet is located behind the control cabinet and is accessed

from the rear of the lineup. The cabinet has two hinged doors that require a tool for

opening and are equipped with a padlock hasp for locking in the closed position.

Located inside the cooling system cabinet are:

• Reservoir

• Deionizer

• Filter

• Pumps (2)

• Temperature regulating valve

• Pressure switch and pressure gauge

• Resistivity / temperature sensor

• Level switches

Power Conversion Cabinets

Power conversion cabinets have hinged covers that require a tool for opening and are

equipped with a padlock hasp for locking the cover in the closed position. Bolted-on

panels cover rear sections requiring access only for high voltage bus connections.

Located inside the power conversion cabinets are:

• Source thyristor converters

• Source ac line filters

• Load thyristor converter

• Load ac line filter

• FGPA gate pulse amplifier boards

• FHVA/B high voltage gate interface boards

• NATO voltage feedback boards

• FCSA current feedback boards

The source converter gating is digitally controlled to produce the required current

through the dc link and the load. The dc link reactor is sized to keep the dc link

current continuous over the system’s operating range. The load inverter gating is

digitally controlled to produce a variable frequency ac output current to the generator

stator terminals.

Input Power

The main input power to the source converters is  provided through the Static Starter

isolation transformer. The isolation transformer is designed for rectifier service and

is either oil filled or dry type, as required by the customer.

Consequently, the harmonic

distortion imposed on the

power system is cut almost in

half over what is produced by

a conventional 6-pulse unit.

The transformer has two sets of 3-phase secondary windings, each rated at 2080 V

ac (half the rated load inverter voltage). One source converter is fed from a delta

connected transformer secondary. The other source converter is fed from a wye

connected transformer secondary. This arrangement phase shifts one converter’s 3

phase ac input voltages by 30º compared to the other converter’s 3-phase ac input

voltages. This configuration results in elimination of nearly half the harmonic

currents generated by the drive, most notably the 5th and 7th harmonics.