LV13922A - Method for determination of distance to fault place by phase-to-earth fault in distribution networks - Google Patents
Method for determination of distance to fault place by phase-to-earth fault in distribution networksInfo
- Publication number
- LV13922A LV13922A LVP-07-119A LV070119A LV13922A LV 13922 A LV13922 A LV 13922A LV 070119 A LV070119 A LV 070119A LV 13922 A LV13922 A LV 13922A
- Authority
- LV
- Latvia
- Prior art keywords
- phase
- specific
- faulty
- voltage
- line
- Prior art date
Links
Landscapes
- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention object relates to electrical distribution networks the neutrals of which are not directly earthed, i.e. to networks with isolated, through arc suppressing coils or through resistors earthed neutrals, in the concrete - to single phase-to-earth faults in medium voltage power lines. The aim of invention is to determine the distance to single phase-to-earth fault using measurements at the monitoring point of the line. For this purpose, the real and imaginary component of apparent impedance Ýa by classical formula for single phase-to-earth fault are used. As a result, direct sequence reactance X1 to fault place is obtained. To enable it, not only specific reactance X1sp of protected line must be known but also several other specific quantities of the line: Xosp - specific zero sequence reactance, Rcsp - specific resistance of phase conductor, Rgsp - specific ground resistance; llin - length of the protected line grid. The faulty phase voltage , current ?ph, ground current ?g must be measured. To diminish the influence of resistance Rcsp instability, the ground current should not be less than sufficient fraction of maximum load current. To raise the accuracy, also temperature Tc of faulty phase conductor should be measured using which the resistance Rcsp can be determined more accurately. To raise the accuracy still more, capacitive current phase-earth ?clin of the faulty line network and specific capacitive currents of the faulty line - current phase-to-earth ?csp and phase-to-phase ?cssp must be taken into account; in the classical formula, the voltage should be used, instead of faulty phase voltage , which is the difference between measured voltage and the voltage, the last being calculated by iteration procedure using faulty line capacitive currents. The distance to fault place is calculated using obtained reactance X1 and the specific one X1sp.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LVP-07-119A LV13922B (en) | 2007-10-16 | 2007-10-16 | Method for determination of distance to fault place by phase-to-earth fault in distribution networks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LVP-07-119A LV13922B (en) | 2007-10-16 | 2007-10-16 | Method for determination of distance to fault place by phase-to-earth fault in distribution networks |
Publications (2)
Publication Number | Publication Date |
---|---|
LV13922A true LV13922A (en) | 2009-04-20 |
LV13922B LV13922B (en) | 2009-08-20 |
Family
ID=41694488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
LVP-07-119A LV13922B (en) | 2007-10-16 | 2007-10-16 | Method for determination of distance to fault place by phase-to-earth fault in distribution networks |
Country Status (1)
Country | Link |
---|---|
LV (1) | LV13922B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
CN106199328A (en) * | 2015-04-30 | 2016-12-07 | 阿尔斯通技术有限公司 | Abort situation detection and distance protection equipment and correlation technique |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111327061B (en) * | 2020-02-12 | 2021-08-03 | 南方电网科学研究院有限责任公司 | Method and device for judging oscillation stability based on apparent impedance |
-
2007
- 2007-10-16 LV LVP-07-119A patent/LV13922B/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
CN106199328A (en) * | 2015-04-30 | 2016-12-07 | 阿尔斯通技术有限公司 | Abort situation detection and distance protection equipment and correlation technique |
Also Published As
Publication number | Publication date |
---|---|
LV13922B (en) | 2009-08-20 |
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