ABB RELION REX640 Technical Manual page 984

Protection and control

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Protection functions

DSTPDIS has five flexible configurable impedance zones for protection (Z1...Z5).

Phase-to-earth distance protection is a basic earth-fault protection in solidly or

low-impedance earthed networks. Together with the phase preference logic, it

also serves as a selective protection function at cross-country faults in isolated

or Petersen coil compensated networks. In certain applications, system earthing is

changed during operation from high-impedance to low-impedance earthed system

due to fault location procedures. DSTPDIS can be used in such applications by

setting System grounding GFC to "From input" and by providing information

about the type of earthing through binary input SYS_EARTHING. Low (inactive)

SYS_EARTHING input indicates low-impedance earthing system.

DSTPDIS is suitable as a basic protection function against two- and three-phase

faults in various networks, regardless of the treatment of the neutral point. The

independent setting of the reach in the reactive and the resistive directions makes it

possible to create a fast and selective short circuit protection in many applications.

DSTPDIS Input signals

Table 926: DSTPDIS Input signals

SYS_EARTHING

1MRS759142 F

Three-phase currents

Three-phase voltages

Residual voltage

Block signal for acti-

vating the blocking

Network earthing

External triggering

for all recorded data

Block GFC operate

Block zone 1

Block zone 2

Block zone 3

Block zone 4

Block zone 5

Technical Manual