Open Source Software ............................................................................................................................... 6

Section 1: Introduction ....................................................................................................................................... 7

1.1 Current Transformer Circuits .............................................................................................................. 7

1.2 External Resistors.............................................................................................................................. 7

1.3 Description ........................................................................................................................................ 7

1.4 Ordering Options ............................................................................................................................... 8

1.5 Functional Diagram ............................................................................................................................ 9

1.6 Terminal Diagram ............................................................................................................................ 10

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

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

2.2 Front Fascia .................................................................................................................................... 13

2.2.1

Front Fascia with Flag Output ............................................................................................. 13

2.2.2

Front Fascia without Flag Output ........................................................................................ 14

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

2.4 Connectors ...................................................................................................................................... 15

2.4.1

Connectors for Self and Dual Powered Relay Variant .......................................................... 15

2.5 Operator Interface............................................................................................................................ 16

2.6 Relay Information ............................................................................................................................ 17

2.6.1

Liquid Crystal Display (LCD) ............................................................................................... 18

2.6.2

Keypad .............................................................................................................................. 19

2.6.3

Light Emitting Diode (LED) ................................................................................................. 20

2.6.4

Local Flag .......................................................................................................................... 20

2.7 Home Screen .................................................................................................................................. 21

2.8 Password Protection ........................................................................................................................ 21

2.9 Software Version Menu .................................................................................................................... 21

2.10 Alert Screen .................................................................................................................................... 22

2.10.1

Fault Alert (Trip Alert) ......................................................................................................... 22

2.10.2

Alarm Alert ......................................................................................................................... 22

2.10.3

Info Alert ............................................................................................................................ 22

2.11 Parameter Edit Screen ..................................................................................................................... 23

Section 3: Protection Functions (50, 51, 50N, 51N, 50G, 51G, 50LC) ................................................................ 24

3.1 Instantaneous Overcurrent Protection (50)........................................................................................ 24

3.2 Time Delayed Overcurrent Protection (51) ........................................................................................ 25

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

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

3.5 Instantaneous Measured Earth Fault Protection (50G) ...................................................................... 30

3.6 Time Delayed Measured Earth Fault Protection (51G) ...................................................................... 31

3.7 Switch-On-To-Fault (50LC/SOTF) .................................................................................................... 33

3.8 General Alarm ................................................................................................................................. 35

3.9 Reset LED, Trip Flag Indication and Binary Outputs .......................................................................... 35

3.9.1

Reset through Binary Input ................................................................................................. 36

3.9.2

Reset using Reydisp Software ............................................................................................ 36

3.9.3

TEST/RESET► Key........................................................................................................... 36

3.9.4

Reset through rear communication protocol ........................................................................ 36

3.10 Current Inputs.................................................................................................................................. 37

3.11 Binary Inputs ................................................................................................................................... 37

3.12 Binary Outputs ................................................................................................................................. 39

3.12.1

Binary Output Matrix ........................................................................................................... 39

3.12.2

Binary Output Configuration ................................................................................................ 39

3.13 Binary Output Operations ................................................................................................................. 40

3.13.1

BO Trip/Reset on Battery/USB ............................................................................................ 40

3.13.2

BO Trip/Reset on CT Input or Auxiliary Voltage ................................................................... 40

3.14 Pulse Output ................................................................................................................................... 41

3.15 Remote Flag Output ........................................................................................................................ 41

Chapter 1 - 7SR45 Description of Operation

Chapter 1 Page 2 of 48