ADR244A
Doc ID: ADR244A/PC/01
Rev No.: 01
Page No.: 5 of 15
Externally measured ground over current through CBCT
Harmonic blocking / Unblocking for
Over Current Protection
(50H/51H/50NH/51NH):
Harmonic blocking / unblocking feature
equipped in ADR244A relay provides stability
on inrush current during transformer
energization. Harmonic blocking/unblocking
feature is independent for each stage of
phase and ground over current protection.
Additional functions (CLP & SOTF):
ADR244A provides the cold load pick up
(CLP) and switch on to fault (SOTF) as
additional functions. User can select the one
of this function for application. Cold load pick
up function provided in relay for multiple
applications. The application of this feature
can be use to avoid wrong operation on
inrush current during transformer
energization without compromising sensitivity
of over current protection.
The ADR244A provides SOTF function to
protection feeder against switch on to fault
condition during feeder/transformer
energization.
Negative Phase Sequence Over
Current Protection (46):
Two independent stages of Definite and
Inverse time Negative sequence over current
protection will be providing back up
protection of over head transmission line /
underground cable / feeder against
unbalanced faults, very high resistive
phase/ground faults and unbalanced loads.
