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MiCOM Alstom P34x
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MiCOM generator protection relays provide flexible and reliable integration of protection, control, monitoring and measurement functions.
 
The wide range of functions offered in this range provide complete protection and control. Their flexibility results in cost-effective solutions for an extensive list of applications.
 
With their extensive functions, MiCOM’s five different generator protection models provide complete protection and control for a wide range of applications. These cover most installations ranging from small generators to sophisticated systems including generator-transformer applications.
 
This range’s extensive protection functions meet the requirements for most generator protection applications. The MiCOM Alstom P391 injection, coupling and measurement unit can be used if rotor earth fault protection is required. They also offer flexible communications options with a number of protocols and communications ports available. In addition their user-friendly Programmable Scheme Logic allows easy customisation of the protection and control functions. 
 
Basic description:
 
 Extensive functionality to meet all generator and generator - transformer application
 Differential protection for fast and selective tripping of phase and earth faults 
 All generator protection, control, monitoring, recording and communications within one box 
 Comprehensive library of hardware options, protection and control functions to meet your system requirements
 
Key customer's benefits:
 
 Extensive condition based monitoring features for the generators and transformers 
 Graphical programmable scheme logic (PSL) eases protection scheme creation, and avoids the need for external logic controllers 
 Range of different protocols [MODBUS, DNP3, IEC60870-5-103 and IEC61850] are available 
 IEC 61850 redundant Ethernet, supporting self healing ring, RSTP, dual homing or PRP
 
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) 
 
Overall differentiation factors:
 
 Comprehensive protocols available including IEC61850 redundant port 
 Binary inputs offer programmable pickup voltage thresholds and programmable filtering - truly universal application 
 Rotor earth fault protection 
 High break output contacts- no reliance on auxiliary devices 
 
Models available:
 
 P342 Small Generator Management IED
 P343 Medium to Large Sized Generator Management IED
 P344 Generator Management IED with 2 Neutral Voltage Inputs
 P345 Large Generator Management IED with 100% Stator Earth Fault
 P346 Small Generator Management IED with Differential
 P391 Rotor Earth Fault Unit