ABB RELION REX640 Technical Manual page 1195

Protection and control

Hide thumbs Also See for RELION REX640:

Table of Contents

1MRS759142 F

Table 1148: Special conditions

U3P connected to real meas-

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 or disabled with the

corresponding parameter values are "on" and "off".

The operation of SCEFRFLO can be described with a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 682: Functional module diagram

The fault distance calculation is done in two steps. First, the fault type is

determined with the in-built Phase selection logic (PSL). Second, based on the

selected impedance measuring element (fault loop) the fault distance from the

measuring point to the fault location is calculated.

The phase current magnitude's minimum threshold value is 1 % xIn.

Technical Manual

The function can work with any two phase voltage channels

connected but it is recommended to connect all three volt-

age channels.

Protection related functions

Operation setting. The