ABB RELION REX640 Technical Manual page 1312

Protection and control

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Supervision functions

Figure 745: Functional module diagram

Differential current monitoring

Differential current monitoring supervises the difference between the summed

phase currents I_A, I_B and I_C and the reference current I_REF.

The current operating characteristics can be selected with the

When the highest phase current is less than 1.0 × In, the differential current limit is

defined with

differential current limit is calculated with the equation.

MAX I A I B I C

The differential current is limited to 1.0 × In.

Figure 746: CCSPVC operating characteristics

When the differential current I_DIFF is in the operating region, the FAIL output is

Start value . When the highest phase current is more than 1.0 × In, the

( _ , _ , _ ) ×

Differential

1MRS759142 F

Start value setting.

(Equation 315)

Technical Manual