ABB / Sudden change in current variation (SCCVPTOC) for DTT _ Setting & highlights _ AB2111

Overview

The “Sudden change in current variation” function is a fast way of finding any abnormality in line currents. When there is a fault in the system, the current changes faster than the voltage. SCCVPTOC finds abnormal condition based on phase-to-phase current variation. The main application is as a local criterion to increase security when transfer trips are used.

For more detailed information on “Sudden change in current variation” function, refer to ABB, Relion 670 Series manuals.

To see other supported functions, click here.

Function Identification

Function description	IEC 61850 identification	IEC 60617 identification	ANSI/IEEE C37.2 device number
Sudden change in current variation	SCCVPTOC	–	51

Signals & Setting Parameters

SCCVPTOC function block

SCCVPTOC Input signals

SCCVPTOC Input signals
Name	Type	Default	Description
I3P	GROUP SIGNAL	–	Three phase to phase current samples group
BLOCK	BOOLEAN	0	Block of function
BLKTR	BOOLEAN	0	Block trip signals

SCCVPTOC Output signals

SCCVPTOC Output signals
Name	Type	Description
TRIP	BOOLEAN	Common trip signal
START	BOOLEAN	Common start signal

SCCVPTOC Group settings (basic)

SCCVPTOC Group settings (basic)
Name	Values (Range)	Unit	Step	Default	Description
Operation	Off On	–	–	Off	Operation Off/On
I>	5 – 100	%IB	1	20	Fixed threshold setting in % of IBase
tHold	0.000 – 60.000	s	0.001	0.500	Hold time for operate signals

SCCVPTOC Group settings (advanced)

SCCVPTOC Group settings (advanced)
Name	Values (Range)	Unit	Step	Default	Description
tDelay	0.000 – 0.005	s	0.001	0.002	Time delay for start and trip signals

SCCVPTOC Non group settings (basic)

SCCVPTOC Non group settings (basic)
Name	Values (Range)	Unit	Step	Default	Description
GlobalBaseSel	1 – 12	–	1	1	Selection of one of the Global Base Value groups

Logics & highlights

Operation principle

Technical data