Operating curve type Supported by
EFLPTOC EFHPTOC
(12) IEC Extremely Inverse x x
(13) IEC Short Time Inverse x
(14) IEC Long Time Inverse x
(15) IEC Definite Time x x
(17) User programmable
curve
x x
(18) RI type x
(19) RD type x
EFIPTOC supports only definite time characteristics.
For a detailed description of timers, see the General function block
features section in this manual.
Table 267: Reset time characteristics supported by different stages
Reset curve type
Supported by
EFLPTOC EFHPTOC 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 EFIPTOC or when
the DT operation is selected. The reset is purely defined by the
Reset delay time setting.
4.2.1.7 Application
EFxPTOC is designed for protection and clearance of earth faults in distribution
and sub-transmission networks where the neutral point is isolated or earthed via a
resonance coil or through low resistance. It also applies to solidly earthed networks
and earth-fault protection of different equipment connected to the power systems,
such as shunt capacitor bank or shunt reactors and for backup earth-fault protection
of power transformers.
1YHT530004D05 D Section 4
Protection functions
615 series 267
Technical Manual
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