Application - ABB RELION 620 Series Technical Manual

1MRS757644 F
4.1.2.6
620 series
Technical Manual
Operating curve type
(13) IEC Short Time Inverse
(14) IEC Long Time Inverse
(17) Programmable
PH3IPTOC supports only definite time characteristic.
A detailed description of the timers can be found in the
function block features
Table 246: Reset time characteristics supported by different stages
Reset curve type
(1) Immediate
(2) Def time reset
(3) Inverse reset
The Type of reset curve setting does not apply to PH3IPTOC or when
the DT operation is selected. The reset is purely defined by the Reset
delay time setting.

Application

PH3xPTOC is used in several applications in the power system. The applications
include different protections, for example.
• Selective overcurrent and short circuit protection of feeders in distribution and
subtransmission systems
• Backup overcurrent and short circuit protection of power transformers and
generators
• Overcurrent and short circuit protection of various devices connected to the
power system, for example shunt capacitor banks, shunt reactors and motors
• General backup protection
PH3xPTOC is used for single-phase, two-phase and three-phase non-directional
overcurrent and short circuit protection. Typically, overcurrent protection is used for
PH3LPTOC
x
x
x
section in this manual.
Supported by
PH3LPTOC PH3HPTOC
x
x
x
Section 4
Protection functions
Supported by
PH3HPTOC
x
General
Note
x Available for all
operating time curves
x Available for all
operating time curves
x Available only for ANSI
and user
programmable curves
247