Sepam - HV/MV Protection and control units (ENG) - Trinet

examplec angle θo = 0° (see figure 2 graph)settings Iso = 2 AT = 0.05 sfor injection i = 5 A, the protection is activated:cosω = 2/5 = 0.4 hence ω = 66.4°v in normal zone 180° + 0° ±ω i.e. [ϕo] equal to113.6° to 246.4°.v in inverse zone 360° + 0° ±66.4° i.e. [ϕo] equal to293.6° to 66.4° (426.4).c angle θo = 0° (see figure 2 graph)with strong current (limit of 14° ranges)settings Iso = 2 AT = 0.05 sfor injection i = 20 A, the protection is activated:cosω = 2/20 = 0.1 hence ω = 84.2°v in normal zone 180° + 0° ±84.2° i.e. [ϕo] equal to104° to 256°, no processing outside this range.v in inverse zone 360° + 0° ±84.2° i.e. [ϕo] equal to284° to 76° (436°), no porcessing outside this range.c angle θo = 30° (see figures 3 and 4 graphs)settings Iso = 2 AT = 0.05 sfor injection i = 5 A, the protection is activated:cosω = 2/5 = 0.4 hence ω = 66.4°v in normal zone 180° + 30° ±ω i.e. [ϕo] equal to143.6° to 276.4°.v in inverse zone 360° + 30° ±66.4° i.e. [ϕo] equal to323.6° to 96.4° (456.4°).c angle θo = -45° (see figures 3 and 4 graphs)setttings Iso = 2 AT = 0.05 sfor injection i = 10 A, the protection is activated:cosω = 2/10 = 0.2 hence ω = 78.4°v in normal zone 180° +(-45° ±ω) i.e. [ϕo] equal to56.6° to 213.4°.v in inverse zone 360° +(-45° ±66.4°) i.e. [ϕo] equal to248.6° to 21.4° (381.4°).Fig 1normalzoneF501/1F501/2F502/1F502/2Fig 2normalzoneF501/1F501/2F502/1F502/2Iporesistive "i"projected fault Ipo"i""i"14°-Iso14°Fig 3 Fig 4Iponormalzoneω"i"Iso0ϕo (parameter)α (injection)θo(protection)VoIsoIso0Iponormalzone"i"plan whereIpo > Isoangles :θo protection = 0°ϕo parameter = 180°α injection = 180°VoVoinversezoneF501/3F501/4F502/3F502/4angles :θo protection = 0°ϕo parameter = 104° à 256°α injection = 104° à 256°ωω"i"Iso0ϕo (parameter)α (injection)projectionlineθo(protection)VoVariation in "i"around Vonormal zoneinverse zoneF501/3Special casesc the injection unit performs a special phase shift and angle measurement,which makes it necessary to make an angle correspondence chart.ExampleInjection according to wiring diagram B7 (i is 180° from Vo).F081/2IsoVoθo = oF501/15%InoCorresponding program logic diagram:F501/1KxxF081/2injection unitapocket terminalϕo+ 180° + 180°+ 90° + 270°0° 0° or 360°- 90° + 90°- 180° + 180°The voltage is created electronically and has a phase shift with respect to thecurrent that serves as the reference for phase shift measurement.c when combined with an earth fault protection set point, the directional protectioncan use the inverse time time delay. The combination is made via customizedprogram logic.Sepam 2000 - Testing1/15