ABB Relion 650 Series Technical Manual page 90

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Table of Contents

Impedance protection

Functionality

The operation of transmission networks today is in many cases close to the stability limit. Due to

environmental considerations, the rate of expansion and reinforcement of the power system is

reduced, for example, difficulties to get permission to build new power lines. Phase selection,

quadrilateral characteristic with fixed angle FDPSPDIS (21) is designed to accurately select the

proper faulted loop(s) in the distance function based on the fault type.

The heavy load transfer that is common in many transmission networks may make fault resistance

coverage difficult to achieve. Therefore, FDPSPDIS (21) has a built-in algorithm for load

encroachment, which gives the possibility to enlarge the resistive setting of both the phase

selection and the measuring zones without interfering with the load.

The extensive output signals from the phase selection gives also important information about

faulty phase(s), which can be used for fault analysis.

Function block

ANSI09000061 V1 EN-US

Figure 40: FDPSPDIS (21) function block

Table 20: FDPSPDIS Input signals

ANSI09000061-1-en.vsd

Three phase group signal for current inputs

Three phase group signal for voltage inputs

Block of function

External directional condition

1MRK 506 326-UUS B

PID-1538-INPUTSIGNALS v6

Line distance protection REL650

Technical manual