ABB RET670 Ansi pre-configuration of Relion 670 series transformer protection

ABB RET670  Ansi pre-configuration of Relion 670 series transformer protection

• A protection, control, and monitoring IED with extensive functional library and configuration possibilities and expandable hardware design to meet specific user requirements 

• For power transformers, autotransformers, shunt reactors, T-protection, generator transformer blocks, phase shifting transformers and small busbar systems 

• For two- and three-winding transformers with up to six stabilized inputs 

• For multi- or single-breaker arrangements 

• Transformer differential protection with: - Percentage bias restraint for through faults - Waveform and Second harmonic restraint for transformer inrush - Fifth harmonic restraint for overexcitation - High sensitivity for interturn faults 

• Restricted earth fault protection for all direct or low impedance earthed windings - Extremely fast operation - High sensitivity - High and low impedance based 

• Full scheme phase-to-phase and phase-to-earth distance protection with up to five zones: - Alternative choice of quadrilateral function, quadrilateral function or mho function - Sensitive directional earth fault function for high ohmic earthed system. - Load encroachment feature

 • Power swing detection including additional logic 

• Directional power protection - Reverse-, low forward-, active-, reactive power protection - Phase angle compensation - Two steps (alarm/trip) 

• Instantaneous high speed short circuit function with low transient overreach 

• Directional overcurrent protection with four steps for each winding - Each step can be inverse or definite time delayed - Each step can be directional or non-directional 

• Instantaneous high speed earth fault function with low transient overreach 

• Four step directional and/or non-directional phase overcurrent protection - Voltage, current or dual polarized - Each step can be inverse or definite time delayed - Each step can be directional or non-directional - Each step can be blocked on second harmonic component 

• Synchronizing, synchrocheck and dead-line check function for single- or multi-breaker arrangements: - Selectable energizing direction - Two functions with built-in voltage selection - For automatic and manual synchronizing and synchrocheck with different settings - Synchronizing of asynchronous networks with settable breaker closing time 

• Selectable additional software functions such as breaker failure protection for each breaker, voltage protection, overexcitation protection, control and monitoring 

• Sudden pressure relief/Buchholtz, temperature devices etc. through binary inputs stabilized against capacitive discharges 

• Data communication modules for station bus IEC 61850-8-1

• Data communication modules for station bus IEC 60870-5-103, TCP/IP or EIA-485 DNP 3.0, LON and SPA 

• Integrated disturbance and event recorder for up to 40 analog and 96 binary signals 

• Function for energy calculation and demand handling - Outputs from measurement function (MMXU) can be used to calculate energy. Active as well as reactive values are calculated in import respectively export direction. Values can be read or generated as pulses. Maximum demand power values are also calculated by the function. 

• Time synchronization over IEC 61850-8-1, LON, SPA, binary input or with optional GPS module (GSM) or IRIG-B module 

• Analog measurements accuracy up to below 0.5% for power and 0.25% for current and voltage and with site calibration to optimize total accuracy 

• Versatile local human-machine interface 

• Extensive self-supervision with internal event recorder 

• Six independent groups of complete setting parameters with password protection 

• Powerful software PC tool for configuration, setting and disturbance evaluation Functions 

• Differential protection - Transformer differential protection, two winding (PDIF, 87T) - Transformer differential protection, three winding (PDIF, 87T) - Restricted earth fault protection (PDIF, 87N) - High impedance differential protection (PDIF, 87X) 

• Impedance protection - Distance protection zones, Mho (PDIS, 21) - Distance protection zones, Quad (PDIS, 21) - Phase selection with load encroachment, quadrilateral characteristic (PDIS, 21) - Phase selection with load encroachment, Mho (PDIS, 21) - Power swing detection (RPSB, 78) - Power swing logic (RPSL, 78) - Broken conductor check (PTOC, 46) 

• Current protection - Instantaneous phase overcurrent protection (PIOC, 50) - Four step phase overcurrent protection (POCM, 51/67) - Instantaneous residual overcurrent protection (PIOC, 50N) - Four step residual overcurrent protection (PEFM, 51N/67N) - Sensitive directional residual over current and power protection (PSDE) - Thermal overload protection, two time constants (PTTR, 49) - Breaker failure protection (RBRF, 50BF) - Pole discordance protection (RPLD, 52PD) - Directional underpower protection (PDUP, 37) - Directional overpower protection (PDOP, 32) 

• Voltage protection - Two step undervoltage protection (PUVM, 27) - Two step overvoltage protection (POVM, 59) - Two step residual overvoltage protection (POVM, 59N) - Overexcitation protection (PVPH, 24) - Voltage differential protection (PTOV, 60) - Loss of voltage check (PTUV, 27)