Shunt reactors are a vital part of the efficient operation of long transmission high voltage power lines.
ABB builds today shunt reactors for direct connection to the highest voltages in operation. Depending on the load pattern of the line and the balance of reactive power, the ABB reactor is suitable for continuous as well as switched operation.
The shunt reactor compensates the capacitive generation on power lines to avoid non-controlled voltage rise especially on lightly loaded lines. The simple design and robust build-up makes the shunt reactor the most cost efficient mean to compensate the capacitive generation.
The ABB reactor design is based on the gapped core concept, which gives a compact design with low losses and low total mass. The concept was introduced in the mid nineteen sixties.
By continuing refinements, ABB has learned to master critical operating parameters like vibrations and noise. Today the reactor has become a high tech product requiring special skills in both design and manufacture.
Shunt reactor construction
Large and high voltage reactors are generally built with an outer frame in magnetic material. The outer frame gives a low reluctance path for the main flux and in normal operation it acts like the side limbs in a five-limbed transformer core.
It has also the advantage of flux patterns in the individual limbs independent of the fluxes in the adjacent limbs.
The operating characteristics of a reactor make it necessary to supply full power to the reactor during the tests. In comparison to transformer testing the manufacture needs additional special test facilities to safely verify the integrity of the reactor.