Doc ID : ADR111A_IM_01
Ref ID : ADR111A/IM/PLF
Rev No. : 04
ADR111A /
ADR211A
To establish the proper communication between the IED and Relay Talk software through
the Computer, the above settings must be set same in the Relay Talk software as well in the
IED.
CT Ratio Settings
The Current transformer setting is required to set for perfect scaling of current measurement.
The primary and secondary values of current settings are set in the as given below table.
Sr. No. Setting Parameters Setting ranges
1. CT Secondary 1A/5A
2. CT Primary 10A to 5000 A
The above settings have to be set based on the Electrical power system parameters to
establish the proper measurement of current in the IED.
Breaker Failure Setting (50BF)
If the Circuit Breaker fails to operate within the settable time following the protection trip then
relay generates a circuit breaker failure trip signal. Following the inception of a fault, one or
more protection functions will operate. Operation of the circuit breaker is essential to isolate
the fault, and prevent damage or further damage to the power system.
For transmission and sub-transmission systems, slow fault clearance can also threaten
system stability. It is therefore common practice to install circuit breaker failure protection
[50BF], which monitors that the circuit breaker has opened within a reasonable time. If the
fault current has not been interrupted following a set time delay from circuit breaker trip
initiation, breaker failure protection (CBF) will operate. CBF operation can be used to operate
back-trip, upstream circuit breakers to ensure that the fault is isolated correctly.
4.4 Phase/Ground Over current Element (50/50N/51/51N)
The ADR111A/ ADR211A has one sensing element. Due to which the same relay can be
used for OC/ EF/ REF application.
The Over-current function operates for a set value of current with time delay (IDMT/DT). This
function provided with two stages, Where Stage 1 (I>1) can be programmed as IDMT or
Definite Time (DT) provided with the Range of 5% to 250% in step of 1%. The Stage 2 (I>2)
can be programmed as Instantaneous or Definite Time (DT) provided with the Range of 50%
to 3000% in step of 1%.
The over Current logic checks the current if it exceeds the pickup value (I>n) and calculates
operating time based on the curve selected in I>n Curve setting and I>n TMS or I>n DT
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