Dry-Type, Air-Core Shunt Reactors THE PROVEN POWER. www.trench-group.com

Shunt Reactors Trench is a supplier of specialized electrical products and a recognized world leader in the design and manufacture of dry type air core reactors for all utility and industrial applications. There are two general types of construction used for shunt reactors. These are referred to as “dry type” and “oil immersed”. The oil immersed construction typically consists of a winding and an iron core which are together housed in a steel tank that is filled with insulating oil. The dry type solution, on the other hand, consists only of the winding itself and support insulators. There is...

Application of Shunt Reactors As the name implies, shunt reactors are connected in a parallel (shunt) configuration to the power system to compensate for the capacitive reactive power of transmission and distribution systems and thereby to keep the operating voltages within admissible levels. Two main applications of shunt reactors can be identified: a) reactors that are required permanently in service for stability reasons (especially on long transmission lines), or b) that are needed for voltage control in a meshed system and are switched in only during light load conditions, when there is...

Shunt reactors connected to the high voltage bus or to a high voltage line The majority of shunt reactors which are connected directly to the high voltage bus or transmission line are of oil-filled type. However, a number of shunt reactors of dry type design have already been applied at voltages up to 345 kV and the demand is growing. One factor driving this demand increase is the integration of renewable generation such as wind parks to the grid. The connecting overhead lines or cables require shunt compensation with ratings for reactive compensation in the range of some tens of Mvars. Usually...

Wye connected shunt reactors with the neutral grounded through a neutral reactor The majority of faults on transmission lines are singlephase-to-ground faults caused by flashovers of the air insulation. Clearing of such faults is achieved by making use of the dielectric recovery of the air. For this purpose the affected phase of the line is temporarily isolated by opening the circuit breaker at both line ends and reclosing the breakers after a certain dead time. This operation is termed single-phase auto-reclosing (SPAR). Long EHV transmission lines are usually operated with shunt reactors permanently...

Main data of Dry-Type, Air-Core Shunt Reactors Placement of Phase Reactors Table 1: Conceptual data of wye connected air-core, dry-type shunt reactors for 50 Hz systems U (kV) U: rated system voltage (kV) Mvar: reactive power (Mvar) of a bank of three single phase reactors, at rated voltage X-50 Hz: reactance per phase (ohm) I: rated phase current (Amps); the reactors are designed to carry continuously 105 % of rated current without exceeding the temperature class limit Q: quality factor (X/R) of the shunt reactor, at 75°C; the numbers given in the table refer to “standard” reactor designs for...

Appendix – Design Details of Trench Dry-Type, Air-Core Technology The sketch below illustrates the design concept of a Trench dry-type, air-core reactor. 1. winding 2. winding conductor 3. spider 4. terminal 5. duct stick 6. base insulator 7. mounting bracket A dry type air core reactor consists of a cylindrical winding (1) made of one or several concentric layers of film/glass tape insulated aluminum conductor (2). All layers are electrically connected in parallel by welding their top and bottom ends to metallic cross arms, commonly referred to as spiders (3). Each spider carries a terminal...

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