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MiCOM Alstom P741/2/3
P74123.jpg
 
MiCOM Alstom P74x (P741,P742,P743):  High Performance Busbar Protection MiCOM Alstom P74x numerical busbar protection scheme provides complete protection for all voltage levels. One of the fastest and most complete in its class, the MiCOM 74x provides secure and sensitive protection for all types of voltage busbar configurations. 
 
Basic description:
 
 Provides secure and sensitive protection for all types of busbar configurations, at all voltage levels 
 Engineered to provide a centralised or a distributed architecture 
 Includes CT saturation detection and dynamic topology processing algorithms 
 Fast reset (less than 1 cycle) circuit breaker failure element
 
Key customer benefits:
 
 Interoperable with all classes of CT: IEEE, IEC, air-gapped, non-gapped - and CTs with moderate knee point voltage 
 IEC 61850 redundant Ethernet, supporting self healing ring, RSTP, dual homing or PRP 
 True subcycle busbar protection - transmission class security and dependability
 
Main characteristics:
 
 Typical operating time of 8ms with high speed/high break (HSHB) contacts, 13ms with standard contacts 
 Sensitive earth fault elements improve detection of resistive or arcing faults 
 Phase segregated biased current differential high speed busbar protection 
 Easy maintenance, operation and future expansion of the busbar supported 
 Up to 28 peripheral units supported - scalable busbar solutions from medium to large substations
 
Overall differentiation factors:
 
 Tripping time is constant, always lower than 1 cycle and independent of the fault current, the substation topology and the number of feeders 
 Free of charge software tools for easy scheme monitoring 
 Connection between central and peripheral units is by fibre, eliminating EMC, touch and step potential issues
 
Models Available:
 
 P741 Busbar Central Unit
 P742 Busbar Peripheral Unit
 P743 Extended Busbar Peripheral Unit
 
Features provided by MiCOM Alstom P74x remote HMI tool:
Scheme editor: allows the user to define and create a P74X busbar scheme using busbar, CT, circuit breaker and isolator graphical icons
Synoptic: allows the user to allocate IEDs (P741, P742, P743) to the busbar scheme synoptic.
 
Dynamic synoptic: allows the user to display the P74x measured analogue quantities and DDB (digital data bus) status information via the user defined P74x scheme created using the scheme editor in accordance with downloaded embedded configuration of P74x IEDs
 
File merge: with this feature the user can automatically create the synoptic settings from above tools into a default setting file of IEDs