ABB RELION REX640 Technical Manual page 1231

Protection and control

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1MRS759142 F

DSTPLAL can be controlled either by the autorecloser (zone extension logic) or by

monitoring the loss of load currents (the loss of load logic). Both operation modes

are enabled independently.

Analog channel configuration

DSTPLAL has one analog group input which must be properly configured.

Table 1175: Analog inputs

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 DSTPLAL can be described with a module diagram. All the modules

in the diagram are explained in the next sections.

LOSSLOAD_ACC

Figure 699: Functional module diagram

Zone extension logic

Zone extension logic is enabled with

When the zone extension operation mode is enabled, the autoreclosing function

DARREC enables a fast fault clearance that covers the entire length of the protected

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

Three-phase currents

Operation mode = "Zone extension".

Protection related functions

Operation setting. The

OPR_LOSSLOAD