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7SR242 Duobias Description Of Operation

Contents

Document Release History....................................................................................................................1

Software Revision History.....................................................................................................................1

Contents ..................................................................................................................................................2

List of Figures.........................................................................................................................................4

List of Tables ..........................................................................................................................................5

Section 1: Introduction ..........................................................................................................................6

Current Transformer Circuits ............................................................................................................6

External Resistors.............................................................................................................................6

Fibre Optic Communication ..............................................................................................................6

Front Cover.......................................................................................................................................6

Section 2: Hardware Description........................................................................................................13

2.1 General ...................................................................................................................................13

2.2 Case........................................................................................................................................13

2.3 Front Cover .............................................................................................................................13

2.4 Power Supply Unit (PSU)........................................................................................................14

2.5 Operator Interface/ Fascia ......................................................................................................14

2.6 Current Inputs .........................................................................................................................16

2.7 Voltage Input...........................................................................................................................16

2.8 Binary inputs ...........................................................................................................................17

2.9 Binary outputs (Output Relays)...............................................................................................18

2.10 Virtual Input/Outputs ...............................................................................................................19

2.11 Self Monitoring ........................................................................................................................19

2.11.1 Protection Healthy/Defective......................................................................................19

Section 3: Protection Functions .........................................................................................................20

3.1 Current Protection: Differential Protection ..............................................................................20

3.1.1 ICT..............................................................................................................................20

3.1.2 Overall Biased Differential (87BD) .............................................................................21

3.1.3 87HS ..........................................................................................................................23

3.2 Current Protection: Phase Overcurrent (51, 50).....................................................................25

3.2.1 Instantaneous Overcurrent Protection (50)................................................................25

3.2.2 Time Delayed Overcurrent Protection (51) ................................................................26

3.3 Current Protection: Derived Earth Fault (50N, 51N)...............................................................27

3.3.1 Instantaneous Derived Earth Fault Protection (50N) .................................................27

3.3.2 Time Delayed Derived Earth Fault Protection (51N)..................................................28

3.4 Current Protection: Measured Earth Fault (50G, 51G)...........................................................29

3.4.1 Instantaneous Measured Earth Fault Protection (50G) .............................................29

3.4.2 Time Delayed Measured Earth Fault Protection (51G)..............................................30

3.5 Current Protection: High Impedance Restricted Earth............................................................31

Fault (64H)...................................................................................................................................31

3.6 Open Circuit (46BC)................................................................................................................32

3.7 Current Protection: Negative Phase Sequence......................................................................33

Overcurrent (46NPS)......................................................................................................................33

3.8 Current Protection: Under-Current (37, 37G) .........................................................................34

3.9 Current Protection: Thermal Overload (49) ............................................................................35

3.10 Voltage Protection: Over Fluxing (24).....................................................................................37

3.11 Voltage Protection: Under/Over Voltage (27/59) ....................................................................39