Switching off the Generator with a Pre-calculated Time Setpoint in Case of Disturbance in the Network

With the disturbance such as load power jump ΔP or as the speed V
t
of gradual power change, the rotor of a synchronous machine gets swing. Emergency automation determines the moment of intervention to prevent serious consequences as a result of specific disturbance. It is desirable to know this time at the very beginning of the disturbance. The main quantity on which the temporal characteristics depend is the period of machine oscillations T
0
which is determined by the inertia moment J, amplitude P
δ
of power-angle curve (P-δ curve) and reference quantity R
0
. The value of reference quantity and oscillation period slightly increase with turbine power P
T
. Time settings decrease with the ratio increasing between actual disturbance intensity and the boundary one. Boundary intensity is the highest value of disturbance before transition to asynchronous move. Briefly: the time setting for possible (if the disturbance persists) disconnection of the generator is determined in advance based on the intensity of the disturbance and taking into account other factors.