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Grid Solutions Multilin 345 Intuitive Transformer Protection The Multilin™ 345 is a member of the Multilin 3 Series protective relay platform and has been designed for the protection, control and management of power transformers as the primary or backup protection device. The 345 provides advanced transformer protection, control and monitoring in one economical drawout or non-drawout design. The 345 contains a full range of self-contained protection and control elements as well as advanced communications, metering, monitoring and diagnostics. • Dual slope with unique dual breakpoint differential protection with unrestrained differential • Second harmonic inrush and fifth harmonic over-excitation inhibits • Thermal Overload and restricted Ground Fault (RGF/87G) • Secure high-speed protection with improved energization inhibiting • Comprehensive overcurrent elements • Field-proven algorithms and reliable protection to avoid unwanted trips or under-protection • Breaker failure and lockout functions • Integrated transformer thermal monitoring for asset management maintenance optimization • Ground current supervised sensitive ground fault protection for detection of ground faults down to 5% of the winding • Temperature monitoring via remote RTD’s using the RMIO module supporting up to 12 RTDs • Ease of use and flexibility with one-step setup, universal CT inputs and assignable CT inputs Metering & Monitoring • Comprehensive metering • Event Recorder: 256 events (1ms time stamping) • Flexible communications with multiple ports and protocols allowing seamless integration • Programmable oscillography up to 32 samples per cycle and, digital states and Fault Report • Powerful security and hierarchical password control for centralized management • Relay health diagnostics and Breaker monitoring • Drawout design simplifies testing, commissioning and maintenance, thereby increasing process uptime • Security and password control • Application flexibility with the use of programmable logic elements • SNTP or IRIG-B time synchronization • Switchgear diagnostics and easy troubleshooting by trip/close circuit supervision and LED and Digital Output Test Mode • Environmental monitoring system to monitor operating conditions and plan preventative maintenance • Robust design exceeding industry standards, with Automotive Grade components and advanced testing procedures such as accelerated life cycle testing Communications • Front USB and rear serial, Copper and Fiber Ethernet ports • Intuitive configuration software and user-friendly logic configuration tool • Multiple communication protocols including IEC 61850, IEC 61850 GOOSE, Modbus® TCP/ IP, Modbus RTU, DNP 3.0, IEC 60870-5-104, IEC 60870-5-103 EnerVista™ Software • Primary or backup protection of two winding power transformers • Simplified setup and configuration • Protection of reactors and autotransformers • Strong document management system • Protection for distribution transformers of various sizes and voltage levels • Full featured monitoring and data recording • Applications requiring fast and secure communications • Maintenance and troubleshooting tool • Protection against corrosion and humidity required for harsh environments • Seamless integration toolkit • Drawout or non-drawout options available • Simplified migration of legacy MII Family rel

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345 Transformer Protection System The 345 is a microprocessor-based system for primary or backup protection of two winding power transformers. The 345 also provides a very cost-effective differential solution for distribution transformers as well as backup protection for primary substations. The 345 offers advanced algorithms for automatic magnitude and phase compensations for more than twenty types of two-winding transformers, fast and secure biased differential protection with dual slope, and dual breakpoint characteristic. The 345 is equipped with restricted ground fault elements to...

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345 Transformer Protection System Enhanced Diagnostics Preventative Maintenance The 345 allows users to track relay exposure to extreme environmental conditions by monitoring and alarming at high ambient temperatures. This data allows proactive scheduling of regular maintenance work and upgrade activities. The diagnostics data enables the user to understand degradation of electronics due to extreme conditions. Switchgear Diagnostics Trip/Close Circuit Monitoring provides constant monitoring of the health the control circuit. Breaker Health feature provides valuable information about the...

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345 Transformer Protection System undesirable operation of the percent differential element. Fifth harmonic inhibiting is integrated into the percent differential element to cater such overexcitation conditions. Differential Current (Id) Transition Region The settings for the dual-slope, dual-breakpoint characteristic provides higher flexibility for shaping up the characteristic and achieve better sensitivity and security. Unrestrained differential (50/87) An unrestrained differential element is provided for fast tripping on heavy internal faults to limit further damage to the transformer...

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345 Transformer Protection System of events, facilitating the diagnosis of relay operation. Event types are individually maskable in order to avoid generating undesired events, and include the metered values at the moment of the event. Device status is communicated via SCADA communications and the front panel display. This continuous monitoring and early detection of possible issues helps improve system availability by employing predictive maintenance. Oscillography / Transient Fault Recorder Temperature Monitoring The 345 captures current waveforms and digital channels at 32 samples per...

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345 Transformer Protection System The following optional protocols are available: • IEC 61850 • Modbus TCP/IP • Modbus RTU These protocols make it easy to connect to a Utility or Industrial automation system, eliminating the need for external protocol converter devices. Enervista Software The Enervista suite is an industry leading set of software programs that simplifies every aspect of using the 345 relay. The Enervista suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate the information measured into DCS or SCADA monitoring systems....

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