High resistance grounding fault line detection method and system
The invention relates to a high resistance grounding fault line detection method and system. The high resistance grounding fault line detection method comprises the following steps: a threshold value of a zero sequence active power absolute value of a small resistance grounding system and zero seque...
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| Hauptverfasser: | , , , , , , , , , , , , , |
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention relates to a high resistance grounding fault line detection method and system. The high resistance grounding fault line detection method comprises the following steps: a threshold value of a zero sequence active power absolute value of a small resistance grounding system and zero sequence active power absolute values of all lines in the small resistance grounding system are obtained; when a magnitude relation between the zero sequence active power absolute value of one line and the threshold value of the zero sequence active power absolute value meets preset conditions for the zero sequence active power absolute value, a high resistance grounding protection device for the small resistance grounding system is started; after the high resistance grounding protection device is started, the zero sequence active power absolute values of all the lines in the small resistance grounding system are compared with each other, and the line with a maximum zero sequence active power absolute value is determine |
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