Page 14 - Catalogo FTM 2017

3. Manutenzione:
• PrimadieffettuarequalsiasioperazioneassicurarsicheiTVnonsianoconnessiallareteocomunquealimentati.
• Verificarelostatodeiserraggi.
• Verificarechenoncisianotraccedicarbonizzazionesullesuperficiisolanti.
• Verificarechenonsianopresentieffetticoronainprossimitàdegliattacchiprimari.
• Èopportunoeliminarelapolveree/oaltridepositi,presentisullasuperficiedeitrasformatori,attraversounpanno
asciutto evitando l’uso di solventi.
4. smaltimento:
• Incasodismaltimentodelmaterialeobsoletoinviarlopressolediscaricheautorizzateutilizzandoilcodicerifiuti C.E.R. 160214 oppure operare secondo le vigenti disposizioni locali e nazionali.
Per quanto non diversamente precisato è opportuno attenersi alle raccomandazioni riportate sui manuali d’uso scaricabili sul sito www.ftmsrl.it.
FURThER DATA FOR VOlTAGE TRANSFORMERS (VT) AND GENERAl DEFINITION
1. Voltage transformers: instrument transformer in which the secondary voltage, in normal conditions of use, is substantially proportional to the primary voltage and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections.
2. Rated primary voltage (Upr), is the value of the primary voltage which appears in the designation on the transformer and on which its performance is based.
3. Rated secondary voltage (Usr), is the value of the secondary voltage which appears in the designation on the transformer and on which its performance is based.
4. Rated voltage factor (Fv), is the multiplying factor to be applied to the rated primary voltage to determine the maximum voltage at which a transformers must comply with the relevant thermal requirements for a specified time and with the relevant thermal requirements for a specified time and with the relevant accuracy requirements.
5. Highest voltage for equipment, (Um) is the highest r.m.s. phase to phase voltage for which a transformer is designed in respect of its insulation.
6. Rated burden, is the value in VA of the burden which the accuracy requirements of this specification are based.
• The standard values of rated output at a power factor of 1, expressed in VA, are:
o 1,0 - 2,5 - 5,0 - 10 VA (burden range I)
• The standard values of rated output at a power factor of 0,8 lagging, expressed in VA, are:
o 10 - 25 - 50 - 100 VA (burden range II)
7. Accuracy class, is a designation assigned to a voltage transformer, the error of which remain within specified limits under prescribed conditions of use. The standard accuracy classes for measuring VT are : 0,1/0,2/0,5/1/3. for protective VT are: 3P/6P.
8. Measuring voltage transformer, is a VT intended to supply indicating instruments, integrating meters and similar apparatus.
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