ALSTOM GE Transformer Protection

The T35 is designed to provide basic transformer protection functions for variety of transformer applications. It uses multiple current inputs to provide primary protection and backup protection of transformers, including differential, phase and ground overcurrent. The relay can be configured to accept up to 6 sets of current inputs to provide proper differential restraint for applications with three-winding transformers with windings configured in dual-breaker arrangements.

Key Benefits

Secure high-speed transformer differential protection in a cost-effective package
Improved security for transformer energization and inrush
Application flexibility for transformers with up to 6 sets of CTs
Robust network security enabling Critical Infrastructure Protection
Advanced IEC 61850 Ed. 1 and Ed. 2 certified implementation, complete settings via SCL files and flexible process bus support (IEC 61850-9-2LE or IEC 61850-9-2 Hardfiber) ensures interoperability, device managing optimization and reduced cost of ownership
Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications
High-speed inter-relay communications reduce relay-to-relay wiring and associated costs
Application flexibility with multiple I/O options including high density I/O, programmable logic, modularity, and specific customization
An integrated large, full color display, provides real-time visualization and control of the protected bay, via a bay mimic as well as annunciator functionality and graphical visualization of phasors

Transformers are high capital assets in electrical power systems. Elimination of all electrical and mechanical stresses, although desirable to preserve transformer life, is impractical. Adaptive techniques to measure, alarm (or trip) and advise on cumulative service can help to schedule preventive maintenance before a costly failure occurs. Internal faults are a risk for all transformers, with short-circuits dissipating the highest localized energy. Unless cleared quickly, the possibility to rewind windings reduces and core damage may become irreparable.

GE's P642, P643 and P645 address all these issues, preserving service life and offering fast protection for transformer faults. A transient bias technique has been included, enhancing relay stability and CT requirements. Hosted on an advanced IED platform, the P64x incorporates differential, REF, thermal, and overfluxing protection, plus backup protection for uncleared external faults. Model variants cover two and three-winding transformers (including auto-transformers), with up to five sets of 3-phase CT inputs.

Key benefits:

• Backup and logging of through faults 
• Simple settings – wizard requires only nameplate data 
• Integrated backup overcurrent per winding or CT input - optional directionalizing when relay fitted with a 3-phase VT  
• Ordering the 3-phase VT permits full monitoring and measurement of power and energy quantities 

Main characteristics:

• Current loop analogue inputs [CLIO] and analogue outputs [RTD] for remote monitoring 
• Optional single or dual redundant Ethernet available for IEC 61850 or DNP3
• Transient biasing reduces CT knee point dimensioning by typically 25% compared to historical applications

The Agile P652 is a dedicated protection relay intended for protection of  two winding transformers. The P652 relay performs an important role with its diagnostic features for improving asset health monitoring. These relays are “CE” marked for safety.

The P652 provides  extensive protection functions including high-speed differential, inrush restraint, Restricted earth fault (high or low impedance modes), thermal overload, backup overcurrent / earth-fault /negative sequence overcurrent protection (HV and LV) and breaker failure detection for HV and LV breakers.

P652 relays offer essential supervision like measurement, monitoring and  recording  functions, communication  protocols for transmitting relay data to a supervisory control system via communication networks, and  an  intuitive HMI for ease of access and configuration. The relay is easily customizable using programmable BI/BO/LEDs/AND logic. The software tools make setting a simple task, and permit access to all the recorded information for monitoring, maintenance and troubleshooting purposes. The hardware capability is broadened by a universal auxiliary power supply range to permit standardization in procurement and inventories.

Customer Benefits:

Optimised protection for Transformer applications
Supports all typical two-end (winding) applications
Cost effective
Measurement / protection / monitoring in one box
Front USB port for local communication
Flexible SCADA communication options
Universal, wide-range auxiliary supply
Diagnostic / maintenance facilities
Identical form factor with P50 Agile basic feeder/motor relays

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

This product is under last-time buy. Orders may be placed until 31st December 2021, and will be fulfilled based upon availability. As an alternative, please refer to the 845 relay

The 745 Transformer Protection System is a full featured transformer protection relay, suitable for application on small, medium, and large power transformers. The 745 can be applied on two-winding and three-winding transformers. Uses multiple current and voltage inputs to provide primary protection and back-up protection of transformers, including differential, ground differential phase, neutral, and ground overcurrent, over-fluxing, and on-load tap changer.

 
Key Benefits
Easy to use Transformer Protection supported by industry leading suite of software tools
Improved security for transformer energization
Accurate built-in metering functions
Advanced FlexLogic automation capabilities
Fast, flexible and reliable communications
IRIG-B time synchronization, event reports, waveform capture, data logger
 
Built in simulation features for setpoint verification
Modbus and DNP 3.0 Level 2 protocols through embedded Ethernet, standard RS232, RS485 & RS422 serial ports.
Optional conformal coating for chemically corrosive and humid environments
Security Audit Trail provides detailed traceability for system configuration changes
Minimize maintenance time with draw-out capability