Setting
Restraint
2
IA
IC
IB
IA
100
nd
st
1
op
nd
2
op
nd
2
op
nd
2
op
*
The B phase and C phase differential elements respond similarly with
IB
op1st
and
IC
op1st
substituted in the
respective equation. This unique method of second harmonic sharing is recommended to ensure proper
restraint on all phases without blocking tripping on faulted phases
.
For special transformers cases, contact the transformer manufacturer or the Basler Electric, Technical
Services Department.
Step 1. If second harmonic sharing is enabled, set the second harmonic restraint unit setting at 18%. If
second harmonic sharing is disabled, set the second harmonic restraint unit at 12%.
Step 2. Set the fifth harmonic restraint unit setting.
5
th
= 35%
EXAMPLE 3 – DUAL BREAKERS
If a two winding transformer has two high side (or low side) breakers brought into two independent inputs
on the relay, calculate the differential settings as if breaker two in the figure below was open (see
Example 2). Then set the relay with identical settings for input 1 and input 2.
Figure D-4. Dual Breakers
D-20
BE1-CDS240 Settings Calculations
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Summary of Contents for BE1-CDS240
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