Basler BE1-32 Instruction Manual

Also see for BE1-32: Quick start guide

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Basler BE1-32 Instruction Manual Manual pdf 14 page image

1-4 BE1-32R, BE1-32O/U General Information 9171100990 Rev RExample 5: Delayed Electrical TripOn large steam units, where overspeeding is a prime concern, a reverse power relay can be used tosupervise electrical tripping (field and main ac breakers) for selected relay operations (e.g., non-electricaltrips, loss of field relay), as shown in Figure 1-5. The reverse power relay delays breaker tripping untiltrapped steam has been removed from the piping. In this case, a separate direct-tripping anti-motoringrelay can be used to protect for situations not related to an automatic shutdown of the unit.Figure 1-5. Single-Phase, Non-Electrical Trip SupervisionExample 6: Breaker Opening DetectionFigure 1-6 shows a reverse power relay used to detect the opening of a source at an industrial (or otherindependent generation) location. A location with no generation but multiple ties from a common source isa good candidate for this relay application. With local generation, the relay is applicable if the localgeneration is not to deliver real power to the utility.Figure 1-6. Breaker Opening DetectionUnder near-floating conditions (minimal flow of real power from the utility), the relay can encounter a widerange of power factor angles in the first and second quadrants (see Figure 1-7). If the local generation isunderexcited, reactive power is supplied by the utility and operation is in the first quadrant. Figure 1-7shows the range of power factor angles (also in the first two quadrants) under heavy line loading.Because of these power factors, the relay must not operate for any angle in the first and secondquadrants.www . ElectricalPartManuals . com