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D90Plus – Legacy

Manufacturing for this product has been discontinued. As an alternative, please refer to the D60 with Firmware 7.7 or newer and User Interface Option E: 7” Graphical Front Panel Display.

The D90Plus is a sub-cycle line distance protection system and bay controller suitable for protecting transmission lines and cables including lines equipped with series compensation. The D90Plus supports dual-breaker applications and can be used for single or three-pole tripping. The D90Plus supports different teleprotection schemes, including DCB, DCU, POTT, Hybrid POTT, and PUTT. The D90Plus also provides synchrophasor measurement over Ethernet per IEEE C37.118.

Key Benefits
  • Secure sub-cycle distance protection
  • CCVT filter improves performance without intentional delays or reduced fault coverage
  • Superior phase selection algorithm ensures secure high-speed single-pole tripping
  • Reliable and secure protection on lines equipped with series compensation
  • Color HMI with metering, event records and control
  • Fault and disturbance recording at up to 128 samples/cycle
  • Built-in phasor measurement unit streaming synchrophasors as per IEEE C7.118
  • Configurable alarm annunciator eliminates the need for separate annunciator panel
  • Applications    
  • Overhead lines including series-compensated lines and underground cables
  • Backup protection for generators, transformers and reactors
  • Single and dual-breaker circuits requiring single/three-pole autoreclosing and independent synchrocheck supervision
  • Circuits with in-zone power transformers - secure application with Capacitively-Coupled Voltage Transformers (CCVTs)

  • Protection & controlMonitoring & meteringCommunicationsSoftware & securityWhat's new

      Key Features    
  • Secure time-domain algorithm providing sub-cycle distance protection
  • Phase distance with independent compensation settings for in-zone power transformers
  • Ground distance with independent self and mutual zero-sequence compensation
  • 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 autorecloser
  • Customization of protection and control functions with independent protection FlexLogic™, FlexCurves™, and FlexElements™
  • Advanced automation controller with independent automation programmable logic
  • Bay control through front panel HMI
  •   Protection & Control
      Modern power systems are under increasing constraints in their ability to transmit power from generation facilities to major load centers, and are forced to operate closer to their natural stability limits. Under these conditions, the critical clearing angle – and corresponding critical clearing time – become progressively smaller and there is an increasing need to minimize the fault clearing time on these constrained circuits.
    The D90Plus is ideally suited for application on circuits where fast fault detection and small breaker failure margin are required. The D90Plus allows transmission limits to be maintained or even increased while respecting the transient stability limits of the power system.
    D90Plus Block Diagram
      Key Features
  • Continuous monitoring of AC input channels
  • Metering - current, voltage, frequency, power, energy and synchrophasors as per IEEE C37.118
  • Transient recorder - 128 samples/cycle, 1 minute or more of storage capacity
  • Disturbance recorder – 1 sample/cycle, 5 minutes or more of storage capacity
  • Event recorder - 8000 time tagged events, with 0.5 ms scan of digital inputs
  • Comprehensive display of metering, phasors, maintenance and fault information via the front panel
  •   Monitoring & diagnostics
      The D90Plus includes detailed metering and recording for all AC signals. Voltage, current, and power metering are built into the relay as a standard feature. Current and voltage parameters are available as total RMS magnitude, and as fundamental frequency magnitude and angle.
    Monitoring & diagnostic sample screens
    Digital fault recorder summary with the latest information on the events, faults, transients and disturbances.
      Control screen for the pre-configured bay with breaker & disconnect control in multiple pages using dedicated pushbuttons on the front panel.  
    Advanced automation
    The D90Plus incorporates advanced automation features including powerful FlexLogic™ (user programmable logic) independent for protection and automation schemes. Combined with the communication capabilities, the D90Plus provides an advanced, highly flexible platform for substation automation applications. The D90Plus integrates seamlessly with other relays for distributed applications like interlocking and special protection schemes.
    User-programmable detection logic
    D90Plus user programmable protection logic and independent automation logic allows users to build custom protection and automation schemes.
      Key Features
  • Multiple protocols - IEC 61850, DNP 3.0 Level 2, Modbus RTU, Modbus TCP/IP, IEC 60870-5-104
  • Up to three independent IP addresses
  • Increase network availability by reducing failover time to zero through IEC62439-3 "PRP" support
  • Front USB port for high-speed communications
    Advanced communications

    The D90Plus provides for secure remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. Fiber optic Ethernet provides high-bandwidth communications allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The availability of three independently configurable Ethernet options provide the means to create fault tolerant communication architectures in an easy, cost-effective manner. The D90Plus supports the most popular industry standard protocols enabling easy, direct integration into SCADA systems.

  • IEC 61850
  • DNP 3.0
  • Ethernet Global Data (EGD)
  • IEC 60870-5-104
  • Modbus RTU, Modbus TCP/IP
  • PRP as per IEC 62439-3
    Front panel
      D90Plus front panel layout
    The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the D90Plus relay. The EnerVista™ suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate information measured by the D90Plus into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the UR setup software included with every UR relay, to carry out postmortem event analysis and ensure proper protection system operation. Learn More
    EnerVista software sample screens
    Security - enabling NERC CIP compliance
    Access Control
    Multilin devices and relays are designed with simple but powerful security to enable reliability and compliance for virtually any project or implementation. With support for multi-level permissions and multi-factor supervisory controls, Multilin devices can help you manage the integrity of your system during commissioning, testing, implementation, and beyond. The UR and URPlus families provide separate authentication for settings and commands to the system. In addition, as discrete authentications for local and remote access, they also provide a supervisory control factor that can lock or unlock a device for configuration changes and other modifications.
    Intrusion Detection
    Multilin’s family of protection and control products can also help enable your security perimeter and intrusion detection programs. By providing essential alarming and logging of critical events, Multilin devices can help you detect potential breaches within your system and allow you to respond quickly and effectively. Specifically, unsuccessful access attempts are logged, alarmed, and lead to potential attackers being locked out. This ensures the reliability of your system during questionable activity, and a control factor that can lock or unlock a device for configuration changes and other modifications.
    Auditing and Reporting
    With the security audit trail reporting feature and support for event logging of key
    activities such as configuration changes, Multilin devices can help ensure device and
    protection system integrity, and perform forensic auditing of activities and changes
    for compliance.
    Auditing and reporting
    protection icon

    Enhanced Sub-Cycle Distance Protection
    - Sub-cycle quadrilateral characteristic added for applications where this characteristic is preferred over the mho characteristic
    - True digital CCVT filter to remove voltage transients introduced and provide accurate voltage information for distance protection – requires only three relay settings

    computer icon Software Ease-of-Use:
    - EnerVista Viewpoint Engineer now available for graphical configuration of Protection and Automation FlexLogic™
    lock icon Security Enhancements - Enabling NERC CIP compliance:
    - Dual permission access requiring live permission from both the user and from SCADA operators before settings can be changed or commands can be given to the relay
    - Remote and local setting and control passwords
    - Configurable lockout responses to unsuccessful password access attempts
    - Successful password access logged in events record
    - Logging of user commands in the security audit trail report creates a record and sequence of events log for troubleshooting and security auditing
    communications icon
    New and Enhanced Communications Capabilities
    - PRP as per IEC62439-3
    input/output icon High-Density I/O Options:
    - New high density I/O option modules featuring either 23 optically isolated inputs or 12 Form-A outputs
    - Ideal for applications like bay control and monitoring, where a large number of additional I/O are required