The D90Plus is a sub-cycle distance relay with true convergence of multiple functions, including advanced automation and control, high accuracy digital fault recording, comprehensive communications and extensive local HMI capabilities.
True convergence of functions eliminates the need to have multiple standalone devices resulting in significant savings in the installation, commissioning, maintenance and life-time costs.
Applications
- Overhead and underground cables of various voltage levels
- Single and dual-breaker circuits requiring single pole/three-pole autoreclosing
- Circuits with in-zone power transformers and tapped transformer feeders
- Wide area monitoring and control using integrated protection and synchrophasors
Protection & Control
- Dual distance protection algorithm running in parallel providing trip times less than a cycle for a wide variety of system conditions
- Five zones of Phase and Ground Distance of mho and quad with independent compensation settings for in-zone power transformers
- Out-of-step tripping and power swing blocking
- Directional overcurrent: Phase, neutral and negative sequence
- Wattmetric zero-sequence directional power
- Under/Over frequency
- Synchronism check for dual breaker applications
- Single/three-pole Four-shot dual breaker auto-recloser
- Independent, user-programmable protection logic (FlexLogic™) for custom schemes
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| 12 pre-configured bay single line diagrams and corresponding controls for all the bay equipment | | Phasor display of sequence components showing the standing unbalance in the line |
Automation
- Advanced automation features including the powerful FlexLogic™ (user programmable logic) independent of protection logic
- FlexLogic™ features math, Boolean and control functions for advanced load shedding, load restoration and dynamic volt/var control schemes
Monitoring & Metering
- Basic metering, data logger and synchrophasors as per IEEE C37.118
- Comprehensive display of metering, phasors, maintenance and fault information in the front panel
- High resolution, fast scan (128 samples/cycle) transient recorder with 30 second storage capacity with 10 microseconds time stamping accuracy
- Independent disturbance recorder with 5 min storage capacity to record long-term events like power swings, voltage sag and swell and trending
- Sequence of Events recorder - 8000 time tagged events, with 0.5 ms scan of digital inputs
Communications
- Supports the following industry standard protocols for easy, direct integration into DCS and SCADA systems:
- IEC61850
- DNP 3.0
- IEC60870-5-104
- Modbus RTU, Modbus TCP/IP
- Independently configurable 3 IP addresses
- Front USB port for local access at high speeds
User Interface
- Digital Annunciator - embedded, configurable, color LCD annunciator for custom alarms
- HMI for display and control functions
- Comprehensive data visualization
- Pre-programmed single line diagrams for bay monitoring and control for common bus configurations, including ring-bus, double breaker and breakerand- half configuration
- Pre-programmed comprehensive displays for Metering, Bay Control, Fault Reports, Sequence of Event Reports, and Real Time Phasor Displays