Vast experience
Over 300 of ABB’s ELK-CP NCITs have been in continuous service for more than a decade. This installed base is an invaluable source of experience in the field of non-conventional instrument transformers.
The first UCA certified merging unit
The merging unit time-correlates and merges sampled values from individual phases and/or measuring points in the substation before transmitting them via the Ethernet network to the protection and control devices. ABB’s CP-MU merging
unit is the first to be verified by an independent test lab and certified as IEC 61850-9-2 LE compliant by the UCA International Users Group.
The CP-MU follows the IEC 61850-9-2 implementation accoring to the UCA International Users Group’s implementation
guideline, also refered to as IEC 61850-9-2LE
One merging unit for ELK-CP14 and ELK-CP3
The CP-MU merging unit is designed for ABB’s ELK-CP14 and ELK-CP3 NCITs. It can interface with up to three independent three-phase voltage and current measuring points, allowing for optimal system design with a minimum of components in 1½-breaker- as well as double-busbar-switchgear arrangements.
Built-in flexibility
The design of protection and control systems can be optimized, thanks to the large number of IEC61850-9-2 LE ports
of the merging unit, and the flexibility of sample synchronization.
The merging unit can act as time master, where it autonomously generates a 1PPS2 signal, or it can work as time
slave, if the synchronisation is performed elsewhere eg, by a GPS clock.
Further more, the merging unit is capable of calculating summated currents from any NCIT inputs and dispatch them viaits
Ethernet ports to protection and control devices.
Fit for retrofit
Applying non-conventional instrument transformers in substation retrofits simplifies the process and therefore reduces outage times, by avoiding the need to change ratios.