Kaitsevoolutrafo täpsusklass on tähistatud selle klassiindeksiga, millele järgneb täht P (tähistab sõna „Kaitse“), kusjuures klassiindeks annab liitmõõtehälbe absoluutväärtuse piiri asjaomase klassi nimipiirväärtuse suhtes, mis on protsent sellest.
The accuracy class of a protective current transformer is designated by its class index followed by the letter P (standing for "Protection"). The class index gives the limit of the absolute value of composite error at the rated accuracy limit primary current for the class concerned, as a percentage of this current.
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