shunt reactor is an absorber of reactive power, thus, increasing the energy efficiency of the system. It is the most compact device commonly used for reactive power compensation in long high-voltage transmission lines and in cable systems. The shunt reactor can be directly connected to the power line or to a tertiary winding of a three-winding transformer.
Why shunt reactors?
Shunt reactors are the most compact and cost-efficient way to compensate for reactive power generation in long highvoltage power transmission lines and in cable systems. They can be permanently used in service to stabilize power transmission, or switched in under light-load conditions for voltage
control only.
Increasing energy efficiency in overhead lines
Over long transmission lines, reactive power is generated asan effect of the capacitance between the lines and earth. The reactive power cannot be used for any application and should be balanced to reduce energy losses. Shunt reactors absorb the reactive power, thus increasing the energy efficiency of
the system.
Improving voltage stability at low load
At low loads, the voltage increases along the transmission line. A shunt reactor reduces the voltage increase, keeps the voltage within the desired limits, and contributes to the voltage stability of the system.
Time-varying load conditions
Transmission systems are subject to daily or seasonal load variations. Variable shunt reactors allow customers to continuously adjust the compensation, as loads vary over time. They make switching in and out of fixed-rating reactors unnecessary, which eliminates harmful voltage steps. The variable reactor can always be adopted to the need, both in today’s operation and in the future grid. In addition, variable shunt reactors can interact with other systems such as SVC and HVDC links in order to optimize the system operation. Variable shunt reactors are therefore economical means to improve voltage stability and power quality under time-varying load conditions.
While fixed shunt reactors are designed for defined system condition and are cost-effective, variable shunt reactors (VSR) offer flexibility and efficiency in grids dealing with fluctuating power flows. VSRs adjust reactor power rating to actual needs, leading to lower losses and noise emissions, making them the ideal choice for networks experiencing continuous fluctuations.
The decision to opt for a fixed SHR often has technical reasons, but the - admittedly more substantial - investment in a variable shunt reactor does pay off: With increasing load fixed shunt reactors will overcompensate the voltage increase, resulting in an overall voltage drops, while variable shunt reactors always compensate accurately and adjust to the current load situation.
Shunt reactors – an investment for today and for the future
Increased revenue
− Increase your revenues of active power in cable applications and long overhead lines.
Reduced costs
− High reliability, low maintenance costs and low internal losses reduce operating costs.
Reliable partner
− Varelen has been supporting its global customers for more than 20 years.
Environmental benefits
− Varelen takes environmental considerations into account throughout the shunt reactor life cycle – design, manufacturing, operation, and phase out
At Varelen, we factory offer a wide range of customized solutions to meet your specific power system needs. With our advanced technology, expertise, and commitment to quality, you can trust us to provide the equipment that powers your grid efficiently and sustainably. Robust design and production excellence ensure exceptional and proven field reliability
