Function Block; Functionality; Analog Channel Configuration; Operation Principle - ABB RELION REX640 Technical Manual

1MRS759142 C
4.4.3.2
4.4.3.3
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4.4.3.5
REX640
Technical Manual

Function block

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Figure 411: Function block

Functionality

The phase discontinuity protection function PDNSPTOC is used for detecting
unbalance situations caused by broken conductors.
The function starts and operates when the unbalance current I
To prevent faulty operation at least one phase current needs to be above the minimum
level. PDNSPTOC operates with DT characteristic.
The function contains a blocking functionality. It is possible to block the function
output, timer or the function itself.

Analog channel configuration

PDNSPTOC has one analog group input which must be properly configured.
Table 680: Analog signals
Input
I3P
See the preprocessing function blocks in this document for the
possible signal sources.
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 Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of PDNSPTOC can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
Protection functions
/I exceeds the set limit.
2 1
Description
Three-phase currents
Section 4
749