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Non-conventional instrument transformers to enable GIS digital substations

Non-conventional instrument transformers (NCITs) and IEC61850-9-2 process bus

ABB’s NCITs for GIS use two redundant Rogowski coils to measure the current. The primary voltage is measured by redundant capactive voltage sensors. The measured values are digitally processed by the secondary converters and sent to the merging unit, which provides the values according to IEC 61850-9-2 LE to protection, control and revenue metering equipment. The CP-MU merging unit was the world‘s first to be conformance certified by UCA International Users Group. With multiple Ethernet ports and connections to NCITs, it offers high flexibility to system design.  

Application

  • Protection and monitoring for digital substations

Why ABB?

  • One multi-purpose electronic current transformer (ECT) or electronic voltage transformer (EVT) for protection, measurement and metering for all applications 
  • More compact than current transformer (CT) or voltage transformer (VT), hence reducing the footprint of the GIS 
  • Redundant secondary converter (sensor electronics) can be replaced during operation, with no calibration necessary 
  • No project specific dimensioning and manufacturing resulting in reduction in cost  
  • Higher availability of primary equipment and improved safety 

Brief performance data

GIS with ELK-CP sensor ELK-CP14 ELK-CP3
Rated voltage [kV] up to 300 up to 550
Rated short-duration power-frequency withstand voltage [kV] 460 740
Rated lightning impulse withstand voltage [kV] 1050 1550 
Rated current  [A] 4000 4000
Rated peak withstand current [kA] 50/63 63
Accuracy class 5TPE  5TPE 
Accuracy class for metering 0.2 (0.2S for
Ipr > 300 A) 
0.2 (0.2S for Ipr > 400 A)

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