Technical Information

The Instruform® Type V165-3x1PhEVT, also as above, has a 3 phase, earthed star point, primary winding and 3 separate single-phase cores, YNyn0(bd), and complies with IEC60044-2-2003 or BS7625-1993 at VF’s of 1.5/30 seconds,1.9/30seconds or 1.9/8hours voltage factors (VF) for solid, resonant or isolated earth neutral systems respectively. To damp inversion which often occurs on 1.9VF EVT’s the design makes the in-phase core wattloss a maximum value of 0.2 of the rated burden (l-n) VA/Ph(0.8PF). The rated (l-n) burdens available are 50VA/Ph to 200VA/ph which should be as closely related to actual (l-n) burdens as possible and are for unsymmetrical (DOC, DEF or UVR) protections at Classes 3P or 6P together with 3Phase 3wire statistical/general measuring classes of 0.5,1 or 3.

The primary windings are epoxy cast resin encapsulated with integral spouts which house the primary fuses (design rated). The secondary fuses are 16A or 32A cartridge fuses with one internal safety earth per 3 phase secondary. The VT’s have provisions for 6 secondary contacts and terminals and 7 secondary fuses and/or links under a removable, accessible in service, top cover. The VT comprises of a carriage on wheels (MP) and fixed portion (FP) with rails, shutters HV chamber and cast resin HV orifices for HV connections and are fully interlocked with provisions for padlocking of the HV orifice shutters and a moving portion locking bolt in both the service and isolated positions.

The primary windings are epoxy cast resin encapsulated with integral spouts which house the primary fuses (design rated). The secondary fuses are 16A or 32A cartridge fuses with one internal safety earth per 3 phase secondary. The VT’s have provisions for 6 secondary contacts and terminals and 7 secondary fuses and/or links under a removable, accessible in service, top cover. The VT comprises of a carriage on wheels (MP) and fixed portion (FP) with rails, shutters HV chamber and cast resin HV orifices for HV connections and are fully interlocked with provisions for padlocking of the HV orifice shutters and a moving portion locking bolt in both the service and isolated positions.

All MP’s and FP’s are jig assembled and wired to be fully interchangeable with the all LMT VT’s previously supplied. The voltage transformers are routinely tested for partial discharge as per the above standards. The life expectancy of the voltage transformer aligns with that of the associated switchgear and is covered by a five-year warranty

The above is a copy of the data sheet below.

More detailed information is available in the document below.

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