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Multilin C90Plus

Line Distance Protection System

The Multilin™ C90Plus is a powerful automation controller that eliminates the need for several external devices, such as substation programmable logic controllers and disturbance recorders. Highly customizable and scalable, C90Plus is designed for blackout and emergency events in transmission and industrial power systems. The C90Plus features intelligent high-end and fast load shedding, bay protection and control, and comprehensive communications.

Key Benefits:


  • High-end load shedding with multiple stages of frequency and volta

  • Highly customizable and scalable

  • Consolidated functionality eliminates requirement for separate devices

  • Synchronized phasor information 

  • HMI with pre-configured and customizable displays

  • High-end fault and disturbance recording


Applications :


  • Advanced bay control and monitoring

  • Fast, power-balance load shed

  • Frequency and voltage load shed

  • Custom bus transfer schemes

  • Substation alarm concentrator, annunciator, and controller

  • Advanced automation schemes such as bus transfer

  • Stand-alone breaker protection and monitoring


Bay Control & Monitoring

Key Features:

  • Dedicated automation controller with 4000 lines of logic

  • Powerful math, control and Boolean operators 

  • Multiple stages for under/over and rate of frequency protection for load shedding

  • Dedicated protection logic at 1 msec execution rate

  • Dedicated HMI for breaker and disconnect control

  • Multi-breaker synchrocheck with single/three-pole autorelcosing

  • Dual-breaker failure protection

  • Direct and tele-protection elements using the inter-relay communication card

  • CT and VT monitoring

  • Metering – current, voltage, frequency, power, energy and phasors

  • Fault recorder – 256 samples/cycle, 30 sec of storage capacity

  • Disturbance recorder – 1 sample/cycle, 5 min of storage capacity

  • Event recorder – 8000 time tagged event, with 0.5 ms scan of digital inputs

  • Comprehensive display of metering, phasors, maintenance and fault information in the front panel

Advanced Bay Control

The C90Plus bay control or monitoring functionality is intended for high-end bay control applications typically used in transmission installations, where a larger quantity of I/O, advanced protection and control functionality and an advanced HMI is desired.

Fast Load Shed

Conventional frequency and voltage load shedding schemes operate typically between 250ms to seconds. Contingency-based load shedding schemes are typically faster at 160 – 400 ms, depending on both system architecture and communications employed. Both these scheme types are too slow for industrial cogeneration applications such as oil and gas or manufacturing, where very fast load shedding is required for power system and critical process integrity.

Fast Load Shed Benefits 

  • Fast optimal load shedding executed within 20ms 

  • Intelligently sheds loads to maintain system/process integrity

  • Highly customizable and scalable, integrating easily into most industrial plants with new or existing EMS/SCADA

  • Optional stand-alone system with local HMI for viewing dedicated system status and reports

  • Suitable for small or large industrial systems without re-design

  • Easy to use system where settings and priorities can be configured within seconds

Recording Capability

There are three recorders available within the C90Plus that eliminate the need for other stand-alone recording equipment. The transient recorder allows for a high sampling rate usually to capture power system faults and system transients. The disturbance recorder is used to capture longer records in order to understand issues such as voltage sags or swells. Lastly, the C90Plus is equipped with a powerful and accurate Sequence of Event (SOE) recorder. Information for all three recorders can be accessed either through the front panel HMI or through EnerVista™ Launchpad Software.



Deterministics Automation

A power system is a real-time system in which time and accuracy of every control should be considered critical. C90Plus operating systems ensure that every action and control is scheduled properly and beforehand to guarantee that nothing is missed nor delayed. This intelligence inside the C90Plus handles both protection trip commands as well as any other logic written for execution as per its programmed timeline. No more delays or missed timelines when it comes to control because the processor is “busy” or otherwise.

  • Dedicated automation controller with 4000 lines of logic at a deterministic 50 msec execution rate

  • Powerful math, control and Boolean operators to support the automation logic engine

  • 10 stages of under/over frequency protection for load shedding

  • 4 stages of rate of change of frequency for load shedding

  • 6 stages of under-voltage elements for load shedding


Key Features

  • HMI can show fault reports to local operators, enabling quick access to time sensitive information

  • Customizable annunciator panel, capable of handling up to 288 alarms using a pallet of 16 colors

  • Front panel display of results from the self-tests performed, allowing easy maintenance and viewing of critical indications

  • Access product information, such as IP addresses and serial numbers, without the need to connect to the unit

  • Increase network availability by reducing failover time to zero through IEC62439-3 “PRP” support

  • IP addresses and serial numbers of each module are also accessible without the need to connect to the unit

  • Full color customizable local HMI allowing easy and secure control

  • HMI-equipped with pre-built screens or configurable to display any single diagram

  • Reliable communication card with automatic failover and extremely fast redundant schemes

  • Inter-relay communication card enables implementation of pilot schemes based on standard communication protocols

  • Both “Direct” and “Tele-Protection” I/O elements

Advanced Communications 

The C90Plus 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 C90Plus 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

Software and Security

Key Features

HMI Display:

  • Display fault reports and self-test results, enabling quick access to time sensitive information

  • Customizable annunciator panel, capable of handling up to 288 alarms using a pallet of 16 colours

  • Access product information, such as IP addresses and serial numbers, without the need to connect to the unit

  • HMI equipped with pre-built screens or could be configured to display any single diagram

Security :

  • Dual permission access, requiring live permission from both the user and from SCADA operators

  • Remote and local setting and control passwords

  • Configurable lockouts 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

EnerVista Software

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the C90Plus 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 C90Plus 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.

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 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.

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Front Panel

C90Plus Brochure

C90Plus Manual

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