Power-take-off from Single-phase-to-earth Fault Current to Power Supply Identification Devices

The paper demonstrates improving the reliability of power supply and operating safety of power receivers in electric networks of 6-10 kV, by controlling the neutral mode in extended electric networks of 6-10 kV with capacitive earth fault currents above 15 A. The purpose of the study is to increase the reliability of power supply and the safety of operation of power receivers in such electric networks, the establishment of patterns in controlling the neutral mode in extended 6-10 kV electric networks with capacitive earth fault currents above 15 A, as well as the development of a method and device automatic detection of single-phase earth fault current. Grounding methods and neutral modes in electric networks with a voltage of 6-10 kV are considered. The method and device for automatically determining the current of a single-phase earth fault were developed. In the result, the relationship between the active and inductive components of the neutral current during series RL grounding of the network Ia/IL=(0.5÷0.3) was established, which ensures reliable operation of the SPEF protection of both current and directional principles including the changes of capacity abruptly networks caused by switching outgoing lines.

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Selection of actuating quantity for digital single-phase-to-earth fault current protection of medium-voltage cable systems

Vestnik IGEU ◽

10.17588/2072-2672.2015.2.021-029 ◽

2015 ◽

pp. 21-29

Author(s):

M.S. Al-Homidi ◽

◽

Т.Yu. Vinokurova ◽

O.A. Dobriagina ◽

V.A. Shuin ◽

...

Keyword(s):

Single Phase ◽

Fault Current ◽

Medium Voltage ◽

Earth Fault ◽

Cable Systems ◽

Selection Of

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A Methodology to Prevent Failure in Single Pole Reclosing Operations

International Journal of Emerging Electric Power Systems ◽

10.1515/ijeeps-2017-0054 ◽

2017 ◽

Vol 18 (6) ◽

Author(s):

Pablo Mourente Miguel

Keyword(s):

Transmission Line ◽

Single Phase ◽

Circuit Breaker ◽

Electric Arc ◽

Residual Current ◽

Fault Current ◽

Operating Mechanism ◽

Operating Cycle ◽

Earth Fault ◽

The Operating Mechanism

AbstractAfter a phase to earth fault in a transmission line, opening of the circuit breaker poles at line extremities interrupts the fault current in the faulted phase. However, due to coupling between phases there is still a residual current through the electric arc, which is then denominated secondary arc. Interruption of the secondary arc defines if single pole reclosing operation will succeed. Nowadays, studies evaluate the likelihood of secondary arc interruption to define application of single phase reclosing. By several reasons, the secondary arc interruption may not occur leading the single pole reclosing operation to a failure. In this case, the circuit breaker pole has to open again and that depletes the energy stored in the operating mechanism. As the rated operating cycle of a fast reclosing circuit breaker is O – 0,3 s – CO – 15 s CO, a failure in the first reclosing shot makes necessary an interval longer than 15 s to perform a second reclosing shot. The methodology presented herein establishes a verification beforehand if a single pole reclosing will be successful. With the secondary arc still active, the single pole reclosing is blocked and the system proceeds to a three pole reclosing. Blocking of the first reclosing shot keeps the energy stored in the operating mechanism and the three pole reclosing shot may proceed with an interval of 300 ms.

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Research on single-phase-to-earth fault section location in coal mine high-voltage power supply system

2017 IEEE 2nd Advanced Information Technology, Electronic and Automation Control Conference (IAEAC) ◽

10.1109/iaeac.2017.8054279 ◽

2017 ◽

Author(s):

Wang Yanwen ◽

Zhang Li

Keyword(s):

High Voltage ◽

Coal Mine ◽

Power Supply ◽

Power Supply System ◽

Single Phase ◽

Supply System ◽

High Voltage Power Supply ◽

Earth Fault

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Research on System Reconfiguration Technology of Distribution System Single-Phase-to-Earth Fault

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.532.603 ◽

2014 ◽

Vol 532 ◽

pp. 603-610

Author(s):

Bo Cai

Keyword(s):

Power Supply ◽

Distribution System ◽

Single Phase ◽

Distribution Network ◽

Network Reconfiguration ◽

Fault Line ◽

System Reconfiguration ◽

Earth Fault ◽

Group A ◽

Group B

Distribution network can operate with electricity for 1~2 hours after single-phase to-earth fault happening, so its network reconfiguration is different from not only reconfiguration in normal situation but also reconfiguration in fault situation and it should consider more factors. This paper puts forward a kind of improved branch exchange algorithm which all power supply restoring areas are divided into two groups: group A which are branch circuits on the same bus of fault line and group B which are power supply restoring lines on the different bus of fault line. For all power supply restoring lines of two groups, when voltage satisfies the constraint conditions, dispatcher prior chooses power supply restoring line which has minimum network loss value in group A in order to avoid outage during process of power supply restoring. Actual flied operation shows that this measure satisfies practical requirements.

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Research of Single Phase Short Fault in One-Generator Infinite Bus Power Systems

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.986-987.1984 ◽

2014 ◽

Vol 986-987 ◽

pp. 1984-1987

Author(s):

Xiao Long Tan ◽

Jia Zhou ◽

Wen Bin Wang

Keyword(s):

Power Systems ◽

Power Supply ◽

Single Phase ◽

Short Circuit ◽

Power Grid ◽

Electric Power Industry ◽

National Standard ◽

Earth Fault ◽

Electricity Use ◽

Depth Analysis

Electric power industry is related to people's livelihood, economic development, an important foundation for national construction industry. With the deepening of our country comprehensive construction, the demand has increased rapidly, at the same time also have higher requirements for quality of power supply. From the previous electricity use can be gradually increased to cannot accept a power outage, to the power grid voltage waveform, harmonic, frequency and so on each index has a clear requirement, countries have introduced related national standard specification. This aspect shows a gradually increase in the standardization of industrialization in China, on the other hand also puts forward higher demands on distribution power supply departments. One of the goals of the grid is to reduce the failure rate, improve the reliability of power supply. And power grid failure and is the highest percentage of short circuit fault, and the single-phase earth fault and occupy the vast majority of proportion, it is necessary to in-depth analysis of the formation mechanism of single-phase earth fault and damage, so as to find the related protection and remedial measures.

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