ABB Transformer protection IED RET 670 RET670
• 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:
- Load encroachment feature
• 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
• Directional earth fault protection with four stages
for each winding
- 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
• Synchrocheck function for single- or
multi-breaker arrangements:
- Selectable energizing direction
- Two functions with built-in voltage selection
• Selectable additional software functions such as
breaker failure protection for each breaker, voltage protection, overexcitation protection, control
and monitoring
• Tripping from Buchholtz, temperature devices
etc. through binary inputs stabilized against
capacitive discharges
• Built-in data communication modules for station
bus IEC 61850-8-1
• Data communication modules for station bus
IEC 60870-5-103, LON and SPA
• Integrated disturbance and event recorder for up
to 40 analog and 96 binary signals
• Time synchronization over IEC 61850-8-1, LON,
SPA, binary input or with optional GPS 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 setting, disturbance evaluation and configuration
• Remote end data communication modules for
C37.94 and G.703
