Microcomputer-based self-shunt excitation system, the microcomputer magnetic control unit, thyristor power unit, de-excitation and rotor over-voltage protection unit and other components. The excitation control, power, de-excitation and rotor over-voltage protection units are integrated in a control cabinet.

Excitation system performance

Excitation system to meet the requirements of manual automatic quasi-synchronous juxtaposition; excitation system to ensure that the excitation current is less than or equal to 1.1 times the rated excitation current (see Figure 1), the excitation system to meet the requirements of power, peaking, FM, line charging, Excitation system to ensure that the generator no-load operation, the frequency of 1% change, the terminal voltage fluctuation is not greater than the rated value of ± 0.1% of the rated voltage of less than 20% of the excitation current, ; The unit in the normal shutdown using the inverter way to de-magnetic, in the electrical accident trip magnetic field circuit breaker for excitation; excitation system to meet the generator no-load voltage regulation and zero from 20 to 130% of the rated voltage boost requirements , And any voltage point in the generator can be stab le under the operation. The AC / DC and DC / DC power modules are all imported industrial grade products. The power supply of AC / DC and DC / DC power supply modules are all imported industrial grade products. . Excitation system is equipped with over-current, over-voltage protection and field winding circuit over-voltage protection device; excitation system insulation voltage in line with the relevant standards; starting from the residual excitation mode, or DC 220V excitation excitation mode.

communication

Excitation control unit can provide serial communication interface such as RS232C, RS485, and realize the data communication with power plant monitoring system according to the communication protocol (such as MUDBUS and our own custom protocol). The excitation system parameters uploaded to the monitoring system, and receive monitoring system control (voltage, reactive power, power factor settings, etc.).

The main function

Operation mode / constant terminal voltage closed-loop operation mode / constant rate of test current closed-loop operation / constant reactive power / power factor mode of operation

Boost Mode / Manual Zero Boost / Auto Zero Boost

Restrictions

Overexcitation limit / Maximum excitation limit / Low excitation limit / Under excitation limit / V / F limit / No load overvoltage limit

Protective function

Pt break protection / over-excitation protection / V / F protection / no-load overvoltage protection / loss of magnetic protection