Please see attached diagram.
The intake supply to an industrial plant Fuji is fed by one 22-kV feeder from
node SPG which is connected to an equivalent utility system PSO as shown in attachment. The load at PSO is 24 MW and 12 Mvar, at SPG is 6 MW and 4 Mvar and at node FPP is 5 MW and 3.3 Mvar. There is no load at all other nodes. The 22-kV network at Fuji is also step down to 3.3 kV at nodes G3.3 and EG1 with the local generator at node EG1 generating at 4 MW at a power factor of 0.94 lag synchronizing to PSO.
Q1: The power factor at Fuji
intake is below 0.85. If the output of the local generator is still kept at 4 MW and the power factor at the Fuji intake has to be above 0.85, what should be done?
(a) reduce the operating voltage at EG1
(b) increase the frequency of the local generator
(c) reduce the frequency of the local generator
(d) increase the operating voltage at EG1
Q2: it is assumed that the
local generator is operated at the maximum output of 8 MW at a power factor of 0.88 lag. However, the frequency in the industrial plant Fuji is reducing from 50 Hz to 49 Hz. To improve the frequency from 49 Hz to 50 Hz, what can be done?
(a) adjust the tap changer of the 22/3.3 kV transformer
(b) adjust the power factor of the local generator
(c) turn on appropriate number of capacitors in the plant
(d) take no action
The intake supply to an industrial plant Fuji is fed by one 22-kV feeder from
node SPG which is connected to an equivalent utility system PSO as shown in attachment. The load at PSO is 24 MW and 12 Mvar, at SPG is 6 MW and 4 Mvar and at node FPP is 5 MW and 3.3 Mvar. There is no load at all other nodes. The 22-kV network at Fuji is also step down to 3.3 kV at nodes G3.3 and EG1 with the local generator at node EG1 generating at 4 MW at a power factor of 0.94 lag synchronizing to PSO.
Q1: The power factor at Fuji
intake is below 0.85. If the output of the local generator is still kept at 4 MW and the power factor at the Fuji intake has to be above 0.85, what should be done?
(a) reduce the operating voltage at EG1
(b) increase the frequency of the local generator
(c) reduce the frequency of the local generator
(d) increase the operating voltage at EG1
Q2: it is assumed that the
local generator is operated at the maximum output of 8 MW at a power factor of 0.88 lag. However, the frequency in the industrial plant Fuji is reducing from 50 Hz to 49 Hz. To improve the frequency from 49 Hz to 50 Hz, what can be done?
(a) adjust the tap changer of the 22/3.3 kV transformer
(b) adjust the power factor of the local generator
(c) turn on appropriate number of capacitors in the plant
(d) take no action
