Catalogo_FTM 2017-ita-ing
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Safety procedures and norms for the use of voltage transformers<br />
1. Transport:<br />
• All installation and transport operations must be carried out in compliance with the applicable safety precautions.<br />
2. Installation:<br />
• Make sure the specifications on the label are compatible with the system’s electrical parameters.<br />
• Make sure that the transformers are physically intact and undamaged in all their parts before attempt<strong>ing</strong> to put<br />
them in operation.<br />
• Maintain the required insulation distance between primary connections and the body of the system.<br />
• Make sure the connections between primary and secondary clips are made properly, both in terms of tightness<br />
and in terms of polarity.<br />
• Make sure the secondary terminals of the VT are always connected to the nominal sett<strong>ing</strong> or in open circuit.<br />
• Ground the support plates and a secondary coil terminal (ex. b).<br />
3. Maintenance:<br />
• Before carry<strong>ing</strong> out any operation, make sure that the VTs are not connected to the power grid or draw<strong>ing</strong> power<br />
in any way.<br />
• Verify the state of the connections.<br />
• Make sure there are no traces of carbonization on the insulat<strong>ing</strong> surfaces.<br />
• Verify the absence of halo effects near the primary connections.<br />
• It is advisable to remove dust and/or other deposits that may be present on the surfaces of the transformers,<br />
us<strong>ing</strong> a dry cloth and avoid<strong>ing</strong> the use of solvents.<br />
4. Disposal:<br />
• In case disposal of obsolete material at an authorized waste disposal site becomes necessary, use materials<br />
code C.E.R. 160214 directive or operate accord<strong>ing</strong> to exist<strong>ing</strong> provisions of local and national.<br />
For any matter not specified should follow the previous instructions of the operat<strong>ing</strong> manuals for download on www.<br />
ftmsrl.it site.<br />
Tabella 5 / Table 5<br />
Limiti dell’errore di tensione e dell’errore d’angolo per i trasformatori di tensione di misura<br />
Limits of voltage error and phase displacement for measur<strong>ing</strong> voltage transformers<br />
Classe<br />
Class<br />
0,1<br />
0,2<br />
0,5<br />
1,0<br />
3,0<br />
Errore di tensione<br />
(rapporto)<br />
Voltage (ratio) error<br />
ε u ±%<br />
0,1<br />
0,2<br />
0,5<br />
1,0<br />
3,0<br />
Minuti<br />
Minutes<br />
±<br />
5<br />
10<br />
20<br />
40<br />
Non specificato<br />
Not specified<br />
Errore d’angolo<br />
Phase displacement<br />
Δφ<br />
Centiradianti<br />
Centiradians<br />
±<br />
0,15<br />
0,3<br />
0,6<br />
1,2<br />
Non specificato<br />
Not specified<br />
pag. 17
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