ABB Relion 650 Series Technical Manual page 188

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Table of Contents

Current protection

Functionality

In isolated networks or in networks with high impedance grounding, the ground fault current is

significantly smaller than the short circuit currents. In addition to this, the magnitude of the fault

current is almost independent on the fault location in the network. The protection can be selected

to use either the residual current or residual power component 3V

quantity. There is also available one non-directional 3I

overvoltage tripping step.

Function block

ANSI08000036 V1 EN-US

Figure 95: SDEPSDE (67N) function block

Table 95: SDEPSDE (67N) Input signals

Table 96: SDEPSDE (67N) Output signals

Table continues on next page

SDEPSDE (67N)

ANSI08000036-1-en.vsd

step and one non-directional 3V

Three phase group signal for current inputs

Three phase group signal for voltage inputs

Block of function

Blocks the non-directional voltage residual outputs

Common trip signal

Trip of the directional residual overcurrent

Trip of non-directional residual overcurrent

Trip of non-directional residual overvoltage

General pickup signal

Pick up of the directional residual overcurrent function

1MRK 506 326-UUS B

GUID-EB27F20E-F477-418B-83F0-744BF2988469 v2

·cos j, for operating

PID-1975-INPUTSIGNALS v6

PID-1975-OUTPUTSIGNALS v5

Line distance protection REL650

Technical manual

SEMOD172780-4 v4