ALSTOM GE Transformer Protection

Its flexibility means it can be used with different bus-bar arrangements.The MiCOM Agile P842 Mesh Corner Reclose unit (MCU) provides a flexible, distributed scheme for delayed auto-reclose (DAR) and auto-isolation of a mesh bus station. 

High-speed peer-peer communications

The MiCOM Agile P842 uses high-speed peer-peer communication facilities over ethernet, and provides for the automatic reclosure of circuit breakers. It also ensures automatic isolation of a persistently faulted plant and suppresses ferro-resonance following a system fault.

The equipment is provided on the basis of one MCU per mesh corner. Although each MCU is an autonomous unit, inter-unit communications guarantees co-ordinated control of a complete mesh system.

Flexibility for easy commissioning and fault-finding

The MiCOM Agile P842 ensures that only the faulted electrical plant is isolated for permanent faults. It provides flexibility for different busbar arrangements, carries out system checks, and suppresses ferro-resonance. MiCOM Agile P842 is equipped with real time peer-peer communications and allows easy commissioning and 'fault-finding'.

About MiCOM P40 Agile

Agile’s philosophy is one of continuous improvement in our products and solutions. Our emphasis on communication in MiCOM has become a focus which secures leadership in the digital substation. To mark this phase of evolution, the brand “P40 Agile” is applied to the range. P40 Agile is a mark of performance and quality, proudly available from Agile, and only from Agile.

Key Benefit

• 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

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 T60 is designed for various power applications, including autotransformers, generator step-up transformers, split-phase, angle regulating transformers and reactors. It uses multiple current and voltage inputs to provide primary protection and backup protection of transformers, including differential, ground differential, five distance zones, phase, neutral, and ground overcurrent, under and overvoltage, under and overfrequency, over-fluxing, and breaker failure.

Key Benefits

• Secure high-speed protection for transformers, compliant with IEEE C37.91
• 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
• Improved security for transformer energization and inrush provided through a superior adaptive 2nd harmonic restraint algorithm
• Three independent fiber or copper Ethernet ports for simultaneous/dedicated network connections with advanced 1 microsecond time synchronization via LAN with IEEE 1588 support
• Sensitive ground fault protection provides low- impedance differential protection down to 5% of the winding to limit transformer damage
• Phasor Measurement Unit (synchrophasor) according to IEEE C37.118 (2011) and IEC 61850-90-5 support
• CyberSentry™ provides high-end cyber security aligned to industry standards and services (NERC CIP, AAA, Radius, RBAC, Syslog)
• Reduced relay-to-relay wiring and associated installation costs through high-speed inter-relay communications
• 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