At Paide substation, a 120 MVar adjustable shunt reactor was installed to compensate for inductive reactive power surpluses in the Järvamaa region. The device significantly improves main grid voltage quality under heavy load conditions.
Paide substation plays an important role in Central Estonia's power supply, serving as a link between the main grid and regional 110 kV lines. A consumer base largely consisting of rural areas and long transmission lines often cause voltage overcompensation, which the adjustable shunt reactor effectively normalizes. The 120 MVar rated capacity is dimensioned specifically for Järvamaa grid conditions.
Reactor installation proceeded in phases — foundation work, crane operations for device positioning, oil system filling and control system calibration. The entire process required careful timing to avoid prolonged outages for regional consumers. After commissioning, the reactor underwent full protection system testing.
