ABB RET670 1MRK002816-AB is a digital protection relay specifically designed for transformer protection. It features high precision, fast response, and flexible configuration, and is an important protective device in the power system.
I. Product Overview
RET670 1MRK002816-AB is a digital protection relay produced by ABB. It is part of the Relion protection and control product line. Designed specifically for the protection of transformers in power systems, it offers comprehensive, precise and reliable protection functions to ensure the safe operation of transformers.
Main functions
Differential protection: The RET670 has a fast and low-impedance differential protection function, with very low requirements for current transformers (CTs). It is suitable for differential applications with up to six constrained CT inputs and can avoid CT saturation and transformer surge current tripping. The differential protection function also has secondary harmonic and waveform block suppression functions, as well as fifth harmonic suppression functions, to further improve the accuracy and reliability of the protection.
Ground fault protection: The RET670 provides multiple low-impedance limiting ground fault protection functions, which can be used as a sensitive and fast main protection for winding ground faults. Additionally, it has high-impedance differential protection functions that can be used in various applications, including limiting ground fault protection as winding protection, autotransformer differential protection, parallel reactor protection, etc.
Overcurrent protection: The RET670 can provide positive sequence, negative sequence, and zero sequence overcurrent protection, with the option for direction and/or voltage control, providing comprehensive backup protection for the transformer.
Overheat protection: The RET670 also has an overheat protection function that can monitor the temperature of the transformer to prevent damage due to overheating.
Other protection functions: In addition to the above protection functions, the RET670 also provides overexcitation protection, overvoltage/undervoltage protection, overfrequency/undervoltage protection, and other various protection functions to ensure the safe operation of the transformer.
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