ABB RELION REX640 Technical Manual page 346

Protection and control

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Table of Contents

Protection functions

Table 390: Special conditions

U3P connected to real measurements

Improper analog channel configuration causes a validation error if the analog

channels are not completely configured or they do not match with certain settings.

For troubleshooting, check the contents of this chapter and also the preprocessing

blocks in this document. The configuration can be written to the protection relay

once the mismatch is corrected.

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "On" and "Off".

The operation of DPHxPDOC can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 206: Functional module diagram

Directional calculation

The directional calculation compares the current phasors to the polarizing phasor.

A suitable polarization quantity can be selected from the different polarization

quantities, which are the positive sequence voltage, negative sequence voltage,

self-polarizing (faulted) voltage and cross-polarizing voltages (healthy voltages).

The polarizing method is defined with the

The function can work with any two phase

voltage channels connected but it is recom-

mended to connect all three voltage chan-

Pol quantity setting.

1MRS759142 F

Operation setting. The

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