P1500SALRP Circuit Protection

Thyristor-based Systems: P1500SALRP Application Field and Working Principle

The P1500SALRP, or Protective Level Autonomous Level Reactor Protection System, is athyristor-based system and a distributed reactive power security system designed for power stations and industrial wind turbines. The P1500SALRP, developed by the American company Iberdrola, is intended for reactive power regulation, fault detection and protection, and other miscellaneous protective functions. It operates as an independent system with minimal dependence on other systems and controllers.

Application Field

The application field of the P1500SALRP is primarily related to the reactive power control in power networks, as well as the protection of electrical and mechanical equipment installed in wind turbines from short circuits and overloads. P1500SALRP utilizes thyristor-controlled reactors to mechanically adjust and regulate the reactive power with almost zero response time. This makes it suitable for the reactive power produced in industrial wind turbines due to sudden changes in power output caused by changes in wind speed. The P1500SALRP also provides several proprietary protection functions, including Leakage Flux, Instantaneous Overcurrent, Time Detailed Overcurrent, Directional Overcurrent, Time Detailed Short-Circuit, Directional Short-Circuit, and Negative Sequence Overcurrent.

Working Principle

The P1500SALRP is based on the thyristor-controlled reactor (TCR) principle and utilizes a group of thyristors connected to the power network in order to control the reactive power. The thyristors are controlled by a power converter connected to the external communication network. The power converter, in turn, is connected to the external communication network and acts as an interface between the P1500SALRP system and the utility operator in order to exchange information. The power converter also controls the thyristors and converts the electrical energy into a form suitable for electronic control.When the reactive power exceed the preset security control limit in the power network, the thyristors in the P1500SALRP will fire in sequence and inject reactive power into the network, thus returning the reactive power to a safe value. When reactive power production from wind turbines drops, the thyristors will cut off the power supplied to the network and terminate the injection process.

Conclusion

The P1500SALRP system is intended for purposes such as active power control in power networks, protection of electrical and mechanical installations in wind turbines, and other protection functions. It utilizes a group of thyristors to control the reactive power and a power converter to interface the P1500SALRP system to the communication network. The P1500SALRP provides excellent reactive power security and is suited for application in the field of power distribution networks and wind farms.