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

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

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

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

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

1.5 Front Fascia ............................................................................................................................................ 6

Section 2: Hardware Description.............................................................................................................................. 9

2.1 General ................................................................................................................................................... 9

2.2 Case........................................................................................................................................................ 9

2.3 Front Cover ........................................................................................................................................... 10

2.4 Power Supply Unit (PSU)...................................................................................................................... 10

2.5 Operator Interface/ Fascia .................................................................................................................... 10

2.6 Current Inputs ....................................................................................................................................... 12

2.7 Voltage Inputs ....................................................................................................................................... 12

2.8 Binary Inputs ......................................................................................................................................... 12

2.9 Binary Outputs (Output Relays) ............................................................................................................ 14

2.10 Virtual Input/Outputs ............................................................................................................................. 15

2.11 Self Monitoring Of The Controller.......................................................................................................... 15

2.11.1

Protection Healthy/Defective................................................................................................... 15

2.12 Battery And Capacitor Test Facility Of The Recloser ............................................................................ 16

Section 3: Protection Functions ............................................................................................................................. 17

3.1 Current Protection: Phase Overcurrent (67, 51, 50).............................................................................. 17

3.1.1

Directional Control of Overcurrent Protection (67) .................................................................. 17

3.1.2

Instantaneous Overcurrent Protection (50) ............................................................................. 19

3.1.3

Time Delayed Overcurrent Protection (51).............................................................................. 20

3.2 Current Protection: Voltage Controlled OC (51V) ................................................................................. 22

3.3 Current Protection: Measured EF (67G, 51G, 50G).............................................................................. 23

3.3.1

Directional Control of Measured Earth Fault Protection (67G) ................................................ 23

3.3.2

Instantaneous Measured Earth Fault Protection (50G)........................................................... 24

3.3.3

Time Delayed Measured Earth Fault Protection (51G) ........................................................... 25

3.4 Current Protection: Sensitive EF (67SEF, 51SEF, 50SEF)................................................................... 26

3.4.1

Directional Control of Sensitive Earth Fault Protection (67SEF) ............................................. 26

3.4.2

Instantaneous Sensitive Earth Fault Protection (50SEF) ........................................................ 27

3.4.3

Time Delayed Sensitive Earth Fault Protection (51SEF) ........................................................ 28

3.5 Current Protection: High Impedance Restricted EF (64H) .................................................................... 29

3.6 Current Protection: Cold Load (51c) ..................................................................................................... 30

3.7 Current Protection: Negative Phase Seq. OC (46NPS) ........................................................................ 31

3.8 Current Protection: Under-Current (37)................................................................................................. 32

3.9 Current Protection: Thermal Overload (49) ........................................................................................... 33

3.10 Voltage Protection: Phase Under/Over Voltage (27/59)........................................................................ 35

3.11 Voltage Protection: Negative Phase Sequence Overvoltage (47)......................................................... 36

3.12 Voltage Protection: Neutral Overvoltage (59N) ..................................................................................... 37

3.13 Voltage Protection: Under/Over Frequency (81) ................................................................................... 38

Section 4: Control & Logic Functions ..................................................................................................................... 39

4.1 Autoreclose (79).................................................................................................................................... 39

4.1.1

Overview ................................................................................................................................. 39

4.1.2

Autoreclose sequences........................................................................................................... 41

4.1.3

AUTORECLOSE PROT'N Menu............................................................................................. 42

4.1.4

AUTORECLOSE CONFIG Menu ............................................................................................ 42

4.1.5

P/F SHOTS sub-menu ............................................................................................................ 44

4.1.6

E/F SHOTS sub-menu ............................................................................................................ 44