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Verification - PTB - Manuals
Instrument Transformers for revenue metering in Germany need a “declaration of conformity” according to the national verification act. One precondition for this declaration is a “type-examination-certificate”.
For new type-examination-certificate (2015 and later), a manual is allocated to the transformer type.
These manuals can be downloaded here. Since this is a specific German aspect (national verification act), these documents are available in German language only.
PTB - Manuals
Manual Ring Core Current Transformer for low voltage applications
PTB Publication
Manual Metal-Clad VT
Manual Medium-Voltage Transformer
Manual Block VT