Operating curve type
PHLPTOC
PHHPTOC
(13) IEC Short Time Inverse
x
(14) IEC Long Time Inverse
x
(15) IEC Definite Time
x
x
(17) User programmable
x
x
(18) RI type
x
(19) RD type
x
PHIPTOC supports only definite time characteristic.
For a detailed description of timers, see the
Table 68:
Reset time characteristics supported by different stages
Reset curve type
PHLPTOC
PHHPTOC
Note
(1) Immediate
x
x
Available for all operate time curves
(2) Def time reset
x
x
Available for all operate time curves
(3) Inverse reset
x
x
Available only for ANSI and user
programmable curves
The
Type of reset curve
setting does not apply to PHIPTOC or when
the DT operation is selected. The reset is purely defined by the
Reset
delay time
setting.
4.1.1.7
Application
PHxPTOC is used in several applications in the power system. The applications
include but are not limited to:
•
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
PHxPTOC is used for single-phase, two-phase and three-phase non-directional
overcurrent and short-circuit protection. Typically, overcurrent protection is used for
Section 4
1MRS757454 D
Protection functions
94
611 series
Technical Manual
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