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.
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
Overhead lines including series compensated lines and underground cables
Backup protection for generators, transformers and reactors
Backup protection for generators, transformers and reactors
Single and dual-breaker circuits requiring single pole/three-pole autoreclosing and independent synchrocheck supervision
Circuits with in-zone power transformers - Secure application with Capacitively-Coupled Voltage Transformers (CCVTs)
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
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.
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.
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.
Digital fault recorder summary with the latest information on the events, faults, transients and disturbances.
Control screen for the preconfigured bay with breaker & disconnect control in multiple pages using dedicated pushbuttons in the front panel.
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.
D90Plus user programmable protection logic and independent automation logic allows the users to build custom protection and automation schemes.
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 option provides the means of creating 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
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 your 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 URPlus Setup software included with every URPlus relay, to carry out postmortem event analysis to ensure proper protection system operation. Learn More
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, it also provides 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.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.
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
Software Ease-of-Use:
- EnerVista Viewpoint Engineer now available for graphical configuration of Protection and Automation FlexLogic™
Security Enhancements - Enabling NERC CIP compliance:
- 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
Ambient Temperature Monitoring:
- Provides alarms when the ambient temperature exceeds hot extreme
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 require
Protection & Control 
