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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.
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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