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Section 6
1MAC050144-MB C
Supervision functions
454
615 series ANSI
Technical Manual
6.5.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
The operation of the fuse failure supervision function can be described by using a module
diagram. All the blocks in the diagram are explained in the next sections.
Figure 242:
Functional module diagram
Negative phase-sequence criterion
A fuse failure based on negative phase-sequence criterion is detected if the measured
negative phase-sequence voltage exceeds the set
Neg Seq voltage Lev
value and the
measured negative phase-sequence current is below the set
Neg Seq current Lev
value. The
detected fuse failure is reported to the decision logic module.
Voltage check
The phase voltage magnitude is checked when deciding whether the fuse failure is a three,
two or a single-phase fault.
The module makes a phase-specific comparison between each voltage input and the
Seal
in voltage
setting. In case the input voltage is lower than the setting, the corresponding
phase is reported to the decision logic module.
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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