Substation generator set

Substation bay: A set of equipment that connects a circuit into a substation. Bays can be connected to generation, such as renewable generators or demand, where high consumption of power requires direct connection, for example electrified railways. Each bay usually includes its own set of switchgear and transformer.

Switchgear: Includes a variety of equipment including disconnectors, fuses, and lightening arrestors often found in substations. This group of equipment ensures the safe disconnection of an electrical circuit when a fault occurs or can isolate a circuit when maintenance needs to be conducted.

Each bay usually includes its own set of switchgear and transformer. Switchgear: Includes a variety of equipment including disconnectors, fuses, and lightening arrestors often found in substations.

A typical distribution system is shown in Figure 3. The number of sets N will depend on the power required, but since generator sets require periodic maintenance, plant power should be able to be supplied by N – 1 sets without any load shedding. The generator set size should be such that they are loaded at least 50%.

Only generators connected at MV level are considered in this chapter. When the installation needs a high level of power availability, one or several MV standby generator set can be used.

When the utility power supply is connected the voltage and the frequency are both fixed by the utility and the control system of the generators must be switched from Voltage/Frequency mode (V/F control mode) to Active power/Reactive power mode (P/Q control mode) (see Fig. B46).