ABB RELION REX640 Technical Manual page 730

Protection and control

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Protection functions

Blocking inputs

Current transformer connections and transformation ratio

The combinations of the connections of the primary current transformers are

designated as "Type 1" and "Type 2". The type needs to be selected separately

for the combination of CT connections on the winding 1 and 2 sides as well as

for the combination of CT connections on the winding 1 and 3 sides in case of

three-winding transformer.

• If the positive directions of the winding 1 and winding 2 relay currents are

opposite, the setting parameter

• If the positive directions of the winding 1 and winding 2 relay currents are equal,

the setting parameter

• 'The default value of the

• The same applies for the

CT connection 1-2 is "Type 2", as shown in

CT connection 1-2 settings is "Type 1".

When active (TRUE), the operation of the function is blocked;

only measurement value outputs are updated.

When active (TRUE), TR3PTDF acts normally except that the

output is not active or activated in any circumstan-

ces. Additionally, the

by the instantaneous high stage (if not blocked).

When active (TRUE), TR3PTDF acts normally except that the

output is not active or activated in any circumstan-

ces. Additionally, the

by the biased low stage (if not blocked).

CT connection 1-2 is "Type 1", as shown in

CT connection 1-3 settings.

1MRS759142 F

output can be activated only

Technical Manual