GE’s MiCOM P342 generator protection relays provide flexible and reliable integration of protection, control, monitoring and measurement functions for a wide range of applications. The P342 relay platform is available in seven models that cover most installations from small generators to sophisticated systems including generator-transformer applications and large variable speed double fed induction pumped storage machines.

Key features of MiCOM P342

• Comprehensive, flexible communications options with a number of protocols and ports available
• User-friendly programmable scheme logic allows easy customization of the protection and control functions
• Binary inputs offer programmable pickup voltage thresholds and filtering enabling a truly universal application
• High break output contacts eliminate reliance on auxiliary devices
• Unique low frequency protection for variable speed double fed induction machines
• Rotor earth fault protection

Key benefits:

• Extensive condition based monitoring features for generators and transformers
• Graphical programmable scheme logic eases protection scheme creation and avoids the need for external logic controllers
• Range of different protocols (MODBUS, DNP3, IEC 60870-5-103 and IEC 61850) are available
• IEC 61850 / DNP3.0 redundant Ethernet, supporting self healing ring, RSTP, dual homing or PRP
• Programmable curves for easy protection customization

Main characteristics:

• Sensitive rotor earth fault protection using low frequency injection method
• Harsh Environment Option to protect against corrosive gases such as H2S or SO2
• Generator and transformer thermal overload, transformer loss of life and through fault monitoring
• Extensive protection for large machines such as pole slipping and 100% stator earth fault protection (3rd harmonic and low frequency injection method)

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