ABB Q5S-O/U251-S6000 UNITROL 5000 excitation controller modules

The ABB Q5S-O/U251-S6000 is a type of UNITROL 5000 excitation controller module. Here is an introduction:

General Information

The Q5S-O/U251-S6000 is an advanced excitation controller module in ABB's UNITROL 5000 series. It is designed for use in medium - sized and large - scale synchronous motors. When applied in static excitation systems (SES), it can be used with power supplies of 50Hz, 60Hz, or 16 2/3Hz, and the field current range is from 1000ADC to over 10,000ADC. When used in automatic voltage regulation systems (AVR) for exciters with special functions, the supply frequency can range from 16 2/3Hz to 400Hz.

Functional Features

Control Functions: It is equipped with a voltage regulator with an adjustable PID controller (automatic mode) and an excitation current regulator with an adjustable PI controller (manual mode). It has functions such as reactive power sensing (droop or compensation), under - excitation and over - excitation limiters, automatic tracking between the automatic mode and the manual mode, and between channel 1 and channel 2. There is also an additional controller used to control the power factor of the generator or the power factor or reactive power of the transmission line, a power factor or mvar power system stabilizer (IEEE2A, APSS, multi - band), and an optional manual limiting function.

Monitoring and Protection Functions: It has over - current protection, inverse - time and instantaneous field - loss and over - excitation protection (volts - per - hertz relay), thyristor bridge temperature monitoring, individual thyristor conduction monitoring, rotating diode monitoring (optional - requires an additional printed circuit board), processor and software monitoring, an integrated fault / alarm recorder, and an instantaneous recorder function.

The ABB Q5S-O/U251-S6000 UNITROL 5000 excitation controller module offers high - performance control and reliable protection for synchronous motors, helping to ensure the stable operation and high - quality power output of power generation equipment.