Answer : The potentiometer of the generator voltage regulation board includes: VOL: voltage regulation; DROOP: reactive power regulation when paralleling; UF: low-frequency protection regulation; TRIM: reactive power regulation when paralleling; OVER EXC: overexcitation protection regulation; STAB: stable regulation
A. VOL: Voltage regulation
Function: If the voltage adjustment does not match the output voltage, turn the voltage adjustment potentiometer clockwise to increase the output voltage; otherwise, the opposite is true.
B. DROOP: Reactive power adjustment during parallel operation
Function: adjust the current to compensate the voltage drop
C, UF: low frequency protection adjustment
Function: play low frequency protection
D. TRIM: Reactive power adjustment during parallel operation
Function: Optimize voltage correction sensitivity.
1. Adjust the excitation current according to the change of the generator load to maintain the terminal voltage as a given value;
2. Control the reactive power distribution among the generators in parallel operation;
3. Improve the static stability of parallel operation of generators;
4. Improve the transient stability of parallel operation of generators;
5. When a fault occurs inside the generator, demagnetize to reduce the degree of fault loss;
6. Implement the maximum excitation limit and the minimum excitation limit for the generator according to the operation requirements.
E. OVER EXC: Over-excitation protection adjustment
Function: Over-current de-excitation makes the generator under rated power, rotate the excitation trip potentiometer counterclockwise to make the indicator diode light up, and then rotate clockwise about 5 degrees.
F. STAB: stable adjustment
Function: Adjust the stability.