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7SR45 Description of Operation

3.19 Real Time Clock .............................................................................................................................. 34

3.20 Battery ............................................................................................................................................ 34

3.21 Firmware Update ............................................................................................................................. 34

List of Figures

Figure 1-1 Functional Diagram of 7SR45 Self Powered Overcurrent and Earth Fault Relay ............................. 8

Figure 1-2 Terminal Diagram of 7SR45 Self Powered Overcurrent and Earth Fault Relay ............................... 9

Figure 2-1 LED Indication Label .................................................................................................................. 10

Figure 2-2 Safety Symbols .......................................................................................................................... 11

Figure 2-3 Relay LCD ................................................................................................................................. 11

Figure 3-1 Logic Diagram: Instantaneous Overcurrent Element .................................................................... 16

Figure 3-2 Logic Diagram: Time Delayed Overcurrent Element..................................................................... 17

Figure 3-3 Logic Diagram: Derived Instantaneous Earth Fault Element ......................................................... 18

Figure 3-4 Logic Diagram: Derived Time Delayed Earth Fault Protection ...................................................... 19

Figure 3-5 Logic Diagram: Instantaneous Measured Earth-fault Element ...................................................... 20

Figure 3-6 Logic Diagram: Measured Time Delayed Earth Fault Element ...................................................... 21

Figure 3-7 Logic Diagram: 50LC Overcurrent Element ................................................................................. 22

Figure 3-8 Operating Time for Single Phase Fault with Binary Output ........................................................... 23

Figure 3-9 Operating Time for Single Phase Fault with Impulse Output ......................................................... 23

Figure 3-10 Reset LEDs Outputs: Reydisp Software Input Matrix ................................................................... 25

Figure 3-11 Reset Flags ................................................................................................................................ 25

Figure 3-12 Binary Input Logic....................................................................................................................... 26

Figure 3-13 Binary Output Logic .................................................................................................................... 28

Figure 3-14 Sensitivity for Single Phase Fault with Binary Output ................................................................... 30

Figure 3-15 Sensitivity for Single Phase Fault with Impulse Output ................................................................. 30

Symbols and Nomenclature

The following notational and formatting conventions are used within the remainder of this document:

• Setting Menu Location MAIN MENU>SUB-MENU

• Setting: Elem name -Setting

• Setting value: value

• Alternatives: [1st] [2nd] [3rd]