ABB RET650 1MRK008516-BA Functional Features

RET650 1MRK008516-BA, as an advanced device, has many outstanding functional features. It performs well in transformer protection, providing reliable "ready-made" solutions for two winding and three winding transformers. The device has undergone type testing and is equipped with complete functionality and default parameters upon delivery, greatly facilitating the entire process from ordering, engineering to debugging and reliable operation. It has a significantly reduced number of parameter settings, making the operation more convenient and efficient. At the same time, the expanded IED HMI features are very powerful, including 15 dynamic three color indicator LEDs per page, up to three pages, and configurable button shortcuts for different operations, providing users with an intuitive and convenient operating interface. In terms of sensitivity and speed, it provides coverage for inter turn faults in power transformer windings. 

The unique negative sequence internal/external fault discriminator is faster than traditional stable transformer differential protection functions, enabling extremely sensitive protection to detect constantly changing internal faults and trip in a timely manner before serious damage occurs. The requirements for the main CT are low, and there is no need for an intermediate CT. The low impedance limited grounding fault function of all direct or low impedance grounding windings provides excellent stability for external faults. Each winding is individually protected without the need for harmonic stability, ensuring high sensitivity and fast tripping. The additional directional zero sequence current standard for this function further enhances safety.

The overcurrent function provides necessary backup protection

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