Page 16 - Catalogo FTM 2017

SAFETy PROCEDURES AND NORMS FOR ThE USE OF VOlTAGE TRANSFORMERS
1. Transport:
• All installation and transport operations must be carried out in compliance with the applicable safety precautions.
2. Installation:
• Makesurethespecificationsonthelabelarecompatiblewiththesystem’selectricalparameters.
• Make sure that the transformers are physically intact and undamaged in all their parts before attempting to put
them in operation.
• Maintain the required insulation distance between primary connections and the body of the system.
• Make sure the connections between primary and secondary clips are made properly, both in terms of tightness
and in terms of polarity.
• Make sure the secondary terminals of the VT are always connected to the nominal setting or in open circuit.
• Groundthesupportplatesandasecondarycoilterminal(ex.b).
3. Maintenance:
• Beforecarryingoutanyoperation,makesurethattheVTsarenotconnectedtothepowergridordrawingpower
in any way.
• Verify the state of the connections.
• Make sure there are no traces of carbonization on the insulating surfaces.
• Verify the absence of halo effects near the primary connections.
• It is advisable to remove dust and/or other deposits that may be present on the surfaces of the transformers,
using a dry cloth and avoiding the use of solvents.
4. Disposal:
• In case disposal of obsolete material at an authorized waste disposal site becomes necessary, use materials
code C.E.R. 160214 directive or operate according to existing provisions of local and national.
For any matter not specified should follow the previous instructions of the operating manuals for download on www. ftmsrl.it site.
Tabella 5 / Table 5
Limiti dell’errore di tensione e dell’errore d’angolo per i trasformatori di tensione di misura
Limits of voltage error and phase displacement for measuring voltage transformers
Classe
Class
Errore di tensione (rapporto) Voltage (ratio) error ε u ±%
Errore d’angolo
Phase displacement Δφ
Minuti
Minutes ±
Centiradianti
Centiradians ±
0,1 0,2 0,5 1,0 3,0
0,1 0,2 0,5 1,0 3,0
5 10 20 40
Non specificato
Not specified
0,15 0,3 0,6 1,2
Non specificato
Not specified
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