RET670 1MRK004816-AC Transformer protection ABB

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Essential details：RET670 1MRK004816-AC Transformer protection ABB

RET670 provides fast and selective protection, monitoring and control for two- and three-winding transformers, autotransformers, step-up transformers and generatortransformer block units, phase shifting transformers, special railway transformers and shunt reactors. The IED is designed to operate correctly over a wide frequency range in order to accommodate power system frequency variations during disturbances and generator start-up and shut-down.
RET670 has a fast, low-impedance differential protection function with very low requirements on the CTs.It is suitable for differential applications with multi-breaker arrangements with up to six restraint CT inputs. The differential protection function is provided with a 2nd harmonic and waveform-block restraint feature to avoid tripping for CT saturation and transformer inrush current, and 5th harmonic restraint to avoid tripping for transformer overexcitation.
The differential function offers a high sensitivity for low-level internal faults by using a sensitive differential protection feature based on an amplitude measurement and directional comparison of the negative sequence components.

RET670 1MRK004816-AC

Multiple low impedance restricted earth-fault protection functions are available as a sensitive and fast main protection against winding earth faults. This function includes a internal/ external fault discriminator for additional security.
Additionally, a high impedance differential protection function is available. It can be used for different applications including restricted earth fault protection as winding protection, autotransformer differential protection, shunt reactor protection, T-feeder protection, busbar protection and generator differential protection.
Tripping and alarm signals from pressure relief, Buchholz and temperature devices can be sent directly to RET670 via binary input channels for alarm and back-up purposes. The binary inputs are highly stabilized against disturbances to prevent incorrect operation due to, for example, DC system capacitive discharges or DC earth faults.

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