Identify the INCORRECT feature of static VAR compensator of EHV transmission system?

Static VAR Compensator:

• A static VAR compensator is a parallel combination of a controlled reactor and fixed shunt capacitor shown in the figure below.
• The thyristor switch assembly in the SVC controls the reactor.
• The firing angle of the thyristor controls the voltage across the inductor and thus the current flowing through the inductor. In this way, the reactive power drawn by the inductor can be controlled.

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Advantages:

• The power transmission ability for the transmission lines can be enhanced through these SVC devices.
• The system’s transient strength can also be increased through the implementation of SVCs.
• In the case of a high range of voltages and for controlling steady states, SVC is generally used which is one of the foremost advantages.
• SVC increases the load power rating and so the line losses will be decreased and system efficiency enhances.
   

The disadvantages of the static VAR compensator are:

• As the device has no revolutionary parts, for the implementation of surge impedance compensation, additional equipment is needed.
• The size of the device is heavy which cause high maintenance cost.
• Deliberate dynamic response.
• The device is not suitable to employ for the regulation of voltage up and downs because of furnace loads.