DIG 50-51-51N Phase and earth analog overcurrent
relay
DESCRIPTION
The overcurrent relays, series DIG, present two independent time
operation settings and a residual current independent time operation
setting, with individual adjustments. They are intended for the
protection of distribution lines, and particularly of trasformer
feeders, agaist overloads, short circuits and earth faults. Owing to the
band pass filter of the residual current function, they can be
employed in the most severe conditions with strong transients and
distorted waveforms.
They are suitable as well for insulated neutral as for solidly or
impedance earthed systems; they can be connected to a ring type
summation transformer or to the common of the phase CT's.
DIC 50-51 Phase overcurrent analog relay
DESCRIPTION
The overcurrent relays, series DIC, contain two independent time operation settings with individual adjustments. They are intended for the protection of electric machines and lines against
overloads and short circuits. They are employed in production, transmission and user electric plants with radial distribution system.
Thanks to the blocking input, it is possible to make multi-level selective protection systems, according to the blocking acceleration scheme.
DID 51N Earth overcurrent analog relay
DESCRIPTION
The residual current relays, series DID, are intended for the protection of lines and electric machines against earth faults.
Owing to their band pass filter, they can be employed in the most severe conditions with strong transients and distorted waveforms.
They are suitable as well for insulated neutral as for solidly or impedance earthed systems; they can be connected to a ring type summation transformer or to the common of the phase CT's.
DVK 27 Undervoltage analog relay
DESCRIPTION
The undervoltage relays series DVK are intended for the protection of electric lines and machines against voltage drop or loss of phase.
Operation is delayed with independent time.
DVB 59 Overvoltage analog relay
DESCRIPTION
The overvoltage relays series DVB are intended for the protection of electric lines and machines against voltage raise.
Operation is carried out whenever one or more of the input voltages is higher than the preset threshold and is delayed with independent time.
DVD 59N Residual voltage analog relay
DESCRIPTION
The maximum residual voltage relays series DVD are designed for the protection against earth faults, in systems with insulated neutral or with resistance or impedance earthed neutral. Thanks to their band pass filter, they are insensitive to transients and harmonic components which can arise in voltage circuits.
They can be connected to the secondary of a VT connected to the neutral of the system, or to the open delta secondary connection of three line VT's, or else in three-phase version to the secondaries of three line VT's, to avoid the star / open delta adapter transformer.
