ADR244A
Doc ID: ADR244A/PC/01
Rev No.: 01
Page No.: 6 of 15
Protection can also apply in condition when
there is a very high resistive ground fault and
ground element may not sense the fault
current.
The negative phase sequence over current
element can be programmed as IDMT or
definite time characteristic. ADR244A relay
provides ten selectable IEC / IEEE inverse
curves and one user define curve for each
stage.
Broken Conductor Protection (46BC):
ADR244A equipped with broken conductor
detection protection. Broken conductor
condition can be detected by ratio of
Negative sequence current to Positive
sequence current (I2/I1) provides higher
sensitivity on High resistive fault.
Thermal overload Protection (49):
ADR244A relay provides thermal over load
protection of transformer against over load
conditions. Relay estimate thermal contents
and initiate alarm & tripping if the thermal
contents are higher than the preset value.
Trip time of relay follows the according to the
thermal time constant value set in to relay.