Table of Contents

Siemens / Overvoltage Protection with Negative or Positive Sequence Voltage _ Setting & highlights _ SI5081

Table of Contents

Overview

The function “Overvoltage protection with negative or positive sequence voltage” is used to monitor the power system and electric machines for voltage unbalances and establish a release criterion of overcurrent protection for unbalanced faults Voltage.

For more detailed information on “Overvoltage protection with negative or positive sequence voltage” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.

To see other supported functions, click here.


Structure/Embedding of the Function

Structure/Embedding of the Function

Setting Parameters


General Setting parameters

Addr. Parameter C Setting Options Default Setting
General
_:2311:10 General:Blk. by meas.- volt. failure   no
yes
yes
_:2311:102 General:Measuring window   1 cycles to 10 cycles 1 cycles
_:2311:101 General:Minimum voltage V1   0.300 V to 60.000 V 5.000 V

Setting parameters for Stage with Negative-Sequence Voltage/Positive-Sequence Voltage

Addr. Parameter C Setting Options Default Setting
Stage 1
_:17071:1 Stage 1:Mode   off
on
test
off
_:17071:2 Stage 1:Operate & flt.rec. blocked   no
yes
no
_:17071:3 Stage 1:Threshold   0.50 % to 100.00 % 10.00 %
_:17071:4 Stage 1:Dropout ratio   0.90 to 0.99 0.95
_:17071:6 Stage 1:Operate delay   0.00 s to 60.00 s 3.00 s
Stage 2
_:17072:1 Stage 2:Mode   off
on
test
off
_:17072:2 Stage 2:Operate & flt.rec. blocked   no
yes
no
_:17072:3 Stage 2:Threshold   0.50 % to 100.00 % 15.00 %
_:17072:4 Stage 2:Dropout ratio   0.90 to 0.99 0.95
_:17072:6 Stage 2:Operate delay   0.00 s to 60.00 s 0.50 s

Logic Diagrams & highlights


Logic Diagram of the General Functionality

Logic Diagram of the General Functionality

Logic Diagram of the Stage: Overvoltage Protection with Negative-Sequence Voltage/Positive-Sequence Voltage

Logic Diagram of the Stage: Overvoltage Protection with Negative-Sequence Voltage/Positive-Sequence Voltage

Voltage Phasors during a 2-Phase Local Fault

Voltage Phasors during a 2-Phase Local Fault

Linking the Pickup of the Negative-Sequence Voltage Stage

Linking the Pickup of the Negative-Sequence Voltage Stage

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