ABB RELION REX640 Technical Manual page 1064

Protection and control

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Protection functions

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 DOPPDPR can be described using a module diagram. All the

modules in the diagram are explained in the next sections.

Figure 593: Functional module diagram

Power calculation

This module calculates the apparent power based on the selected voltages and

currents. The

are used. It is also possible to use positive-sequence components for calculating the

apparent power which makes the determination of power insensitive to a possible

asymmetry in currents or voltages and corresponds to the real load on the prime

mover of the generator.

Table 1001: Power calculation

Measurement mode setting

PhsA, PhsB, PhsC

Table continues on the next page

Measurement mode setting determines which voltages and currents

Power calculation

1MRS759142 F

Operation setting. The

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