Technical FAQs 4

Do substations have generators?

Substations do not (usually) have generators, although a power plant may have a substation nearby. A typical substation will contain line termination structures, high-voltage switchgear, one or more power transformers, low voltage switchgear, surge protection, controls, grounding (earthing) system, and metering.

How a substation is used in a power plant?

Substation are used to transform the voltage with power transformer. From low voltage to high voltage at the power plant with breaker and control system to be able to transport the energy, and other substation at the arrival to decrease the voltage.

How a power supply is connected to a generator?

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).

How to connect MV metering to a substation?

Connection to the MV network can be made: Via a ring main unit including two load-break switches. As mentioned for substation with LV metering, only oil-immersed and dry type cast-resin transformers are allowed with the same rules of installation.

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Can the generator be directly connected to the substation

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