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19:33 Jul 23, 2020 |
Polish to English translations [PRO] Tech/Engineering - Engineering (general) | |||||
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| Selected response from: Frank Szmulowicz, Ph. D. United States Local time: 13:20 | ||||
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Summary of answers provided | ||||
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2 +1 | undervoltage protection |
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2 +1 | low voltage protection |
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undervoltage protection Explanation: Zabezpieczenie zanikowe – zabezpieczenie stosowane przy zasilaniu silników elektrycznych, gdy ich samorozruch po wcześniejszym zaniku napięcia może mieć niepożądane następstwa takie jak: zagrożenie życia ludzi lub zakłócenie procesów technologicznych. Zabezpieczeniem zanikowym może być wyzwalacz lub przekaźnik ponad napięciowy. https://pl.wikipedia.org/wiki/Zabezpieczenie_zanikowe#:~:tex... cccccc Undervoltage protection is commonly used to protect motors from damage during abnormal conditions and to prevent breaker-fed motors from re-accelerating after a restoration of bus voltage. There are three types of undervoltage conditions to consider: - Transient undervoltage - Voltage sag - Complete loss of source A. Transient Undervoltage Conditions A transient undervoltage condition is one that initially occurs due to a fault in the system but then quickly recovers when the fault is cleared. B. Voltage Sag A voltage sag is an undervoltage condition that occurs over a relatively long time. C. Complete Loss of Source A complete loss of source is when a breaker or contactor is opened to decouple the motor from the source. If the source remains open, the motor, lacking an emf, will obviously continue to decelerate until it stops. Once the motor is removed from the source supply, the inertia of the machine will cause the rotor windings to cut the decaying air gap flux. The danger in this scenario is not the undervoltage itself but the possibility of restoring source voltage out-of-phase with the motor’s residual voltage http://prorelay.tamu.edu/wp-content/uploads/sites/3/2018/03/... |
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low voltage protection Explanation: low voltage protection (device/function) -------------------------------------------------- Note added at 10 hrs (2020-07-24 05:49:25 GMT) -------------------------------------------------- voltage dip/sag - a sudden reduction of the voltage at a point in an electrical system followed by voltage recovery after a short period of time from a few cycles to a few seconds http://www.electropedia.org/iev/iev.nsf/display?openform&iev... |
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