The effect of distribution system grounding on MOV selection
| Autor: | A. Myers, R.T. Mancao, J.J. Burke |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Engineering
business.industry Ground Electrical engineering Energy Engineering and Power Technology Ground and neutral Structural engineering Fault (power engineering) Lightning arrester Symmetrical components law.invention Overvoltage law Electrical network Electrical and Electronic Engineering business Voltage |
| Zdroj: | IEEE Transactions on Power Delivery. 8:139-145 |
| ISSN: | 0885-8977 |
| DOI: | 10.1109/61.180329 |
| Popis: | Since most MOV arresters do not incorporate a gap in their design, the arrester is always in conduction and considered to be much more prone to damage due to steady-state line-to-neutral overvoltage. The authors investigate design parameters that affect this overvoltage, using a calculation method that considers a detailed representation of neutral grounding electrodes and their resistances which are normally neglected when symmetrical components method are utilized. It is found that obtaining a 25 Omega ground footing resistance does not ensure low overvoltages during line-to-ground faults; the highest overvoltages during line-to-ground faults can be found on short feeders and for faults close to the substation; small neutral wire can significantly increase overvoltages; and broken neutrals can result in overvoltages exceeding 1.5 per unit during line-to-ground fault conditions (neglecting transformer saturation). > |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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