Section 6
1MAC050144-MB C
Supervision functions
440
615 series ANSI
Technical Manual
The operation of current circuit supervision can be described by using a module diagram.
All the blocks in the diagram are explained in the next sections.
Figure 233:
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
Pickup value
setting. When
the highest phase current is less than 1.0 xIn, the differential current limit is defined with
Pickup value
. When the highest phase current is more that 1.0 xIn, the differential current
limit is calculated with the formula:
Pickupvalue
(Equation 53)
The differential current is limited to 1.0 xIn.
Содержание 615 Series ANSI
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