One very important component of a power transformer is the on-load tap changer (OLTC). The principal of the dynamic resistance measurement (DRM) was developed to analyse the switching process of OLTCs.
The latest software version 3.40 of the CPC 100 Toolset and Primary Test ManagerTM (PTM) includes the new ‘OLTC scan’ function, which allows DRM to be performed with the CPC 100 + CP SB1 test system.
The new ‘OLTC scan’ can be performed as a supplementary measurement in order to analyze the OLTC’s switching process. DC current is injected in the same way as in static winding resistance measurement with the addition of recording the dynamic behaviour of the diverter switch. Based on this non-invasive testing method, failures can be detected without opening the OLTC compartment. As a result, the reliability of the OLTC can be improved, maintenance costs can be reduced and most importantly, unexpected and expensive outages can be avoided.
Omicron electronics
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