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 primary or backup protection device. The 345 provides advanced transformer protection, control and monitoring in one economical draw-out or non draw-out design. The 345 contains a full range of self-contained protection and control elements as well as advanced communications, metering, monitoring and diagnostics.
Key Benefits
- Secure high-speed protection with improved energization inhibiting
- Field-proven algorithms and reliable protection to avoid unwanted trips or under-protection
- 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
- Flexible communications with multiple ports and protocols allowing seamless integration
- Powerful Security and hierarchical password control for centralized management
- Drawout design simplifies testing, commissioning and maintenance, thereby increasing process uptime
- Application flexibility with the use of programmable logic elements
- 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
- Draw out or non draw out options available
- Simplified migration of legacy MII Family relays to the 3 Series platform
- Intuitive configuration software and user-friendly logic configuration tool
Applications
- Application flexibility with the use of programmable logic elements
- 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
- Draw out or non draw out options available
- Simplified migration of legacy MII Family relays to the 3 Series platform
- Intuitive configuration software and user-friendly logic configuration tool
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Key Benefits
- 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)
- Comprehensive overcurrent elements
- Breaker failure and lockout functions
- Logic elements
Protection & Control
The 345 transformer protection system is designed to protect and control small to medium size power transformers. Flexible and powerful, the 345 provides advanced transformer protection, control and monitoring in one economical draw-out design. The 345 contains a full range of self-contained protection and control elements as detailed in the Functional Block Diagram and in the Features table. The 345 can be even used for dual feeder protection.
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