1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
241
Technical Manual
4.2.4
Negative-sequence overvoltage protection 47
4.2.4.1
Identification
4.2.4.2
Function block
Figure 113:
Function block
4.2.4.3
Functionality
The negative-sequence overvoltage protection 47 is used to detect negative-sequence
overvoltage conditions. 47 is used for the protection of machines.
The function picks up when the negative-sequence voltage exceeds the set limit. 47
operates with the definite time (DT) characteristics.
The function contains a blocking functionality. It is possible to block function outputs, the
definite timer or the function itself, if desired.
4.2.4.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
The operation of negative sequence overvoltage protection can be described by using a
module diagram. All the blocks in the diagram are explained in the next sections.
Figure 114:
Functional module diagram. V
2
is used for representing negative phase
sequence voltage.
Level detector
The calculated negative-sequence voltage is compared to the set
Pickup value
setting. If
the value exceeds the set
Pickup value
, the level detector enables the timer..
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative sequence overvoltage protection
NSPTOV
U2>
47
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
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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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