Brushless excitation with the TECO-Westinghouse exclusive PULSE/SYN
control is available for all synchronous motors and generators
for fixed speed and line start applications. It is well suited
for installations such as refineries and chemical process plants
requiring low maintenance and elimination of sparking.
The TECO-Westinghouse brushless excitation system consists of
a field discharge resistor, diodes, SCR’s a gating module and
a synchronizing module. The discharge resistor is shunted across
the motor field during starting. At the proper slip and phase
angle, the resistor is removed automatically from the field circuit
and DC current is applied to the field to pull the motor into
synchronism.
The key to the Pulse/SYN system is the synchronizing module.
This module has two separate functions. The first function is
phase angle synchronization. The module monitors rotor speed (by
frequency of induced field voltage) and rotor phase angle (by
phase angle of induced voltage). When the speed and phase angle
are such as to cause minimum disturbance to the supply system
the field voltage is applied and the motor "pulls-in" to synchronization.
The second function of the synchronizing module is to handle
the occurrence of "post-synchronization." This is when the motor
synchronizes by reluctance before the field voltage is applied.
The module monitors the rotor speed and excitations voltage. When
the frequency of induced field voltage is zero for a predetermined
time and excitation voltage is available, the field voltage is
applied to the motor field. This action places the rotor in proper
phase position and synchronization.
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