Operating curve type Supported byEFLPTOC 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 programmablecurvex x(18) RI type x(19) RD type xEFIPTOC supports only definite time characteristics.For a detailed description of timers, see the General function blockfeatures section in this manual.Table 267:Reset time characteristics supported by different stagesReset curve type Supported byEFLPTOC EFHPTOC Note(1) Immediate x x Available for alloperate time curves(2) Def time reset x x Available for alloperate time curves(3) Inverse reset x x Available only for ANSIand userprogrammable curvesThe Type of reset curve setting does not apply to EFIPTOC or whenthe DT operation is selected. The reset is purely defined by theReset delay time setting.4.2.1.7 ApplicationEFxPTOC is designed for protection and clearance of earth faults in distributionand sub-transmission networks where the neutral point is isolated or earthed via aresonance coil or through low resistance. It also applies to solidly earthed networksand earth-fault protection of different equipment connected to the power systems,such as shunt capacitor bank or shunt reactors and for backup earth-fault protectionof power transformers.1YHT530004D05 D Section 4Protection functions615 series 267Technical Manual
