ADR244A
Doc ID: ADR244A/PC/01
Rev No.: 01
Page No.: 3 of 15
Radial feeder application
The functional overview of ADR244A:
Protection functions Overview
Non Directional Over Current
Protection (50/50N/51/51N):
The core functionality of ADR244A relay is
equipped with multi function feeder
protection. The relay provides Non
Directional phase and ground over current
protection with multiple settings (Two stages
for phase over current and ground over
current) for various power system
applications and wide range of protection
settings. The function is equipped with digital
filter algorithms, providing the rejection of
higher harmonics & DC offset. Selectable
IEC / IEEE inverse time curves & user define
curve with non directional over current
protection will be providing greater
selectivity, flexibility and sensitivity to users
for better relay co-ordinations.
ADR244A relay provides inverse time over
current characteristic for phase and ground
over current elements. Each stage of phase
and ground over current elements are
ANSI Code Description
CLP
Cold load pick up
37
Under current Protection
46
Negative Phase Sequence Protection
46BC
Broken Conductor Detection
47
Phase Reversal Detection
49
Thermal overload Protection
50
Instantaneous/Definite Time Phase
Over current Protection
51
Inverse Time Phase Over current
Protection
50N
Instantaneous/Definite Time Ground
Over current Protection
50LR
Locked rotor/Motor stall Protection
51N
Inverse Time Ground Over current
Protection
64G
High Impedance Restricted Earth
Fault Protection
66
Number of starts
50BF
Breaker Failure
86
Lockout (Trip command)
