Method and apparatus for detecting faults in three-phase electrical distribution network

A power distribution network and fault technology, applied to fault locations, measuring devices, circuit devices, etc., can solve problems such as the difficulty of locating faults, and the method has not been used on a large scale, and achieve the effect of simple and cheap manufacturing

Active Publication Date: 2019-03-15
EMTELE OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All of these approaches have limitations, such as localizing faults to the correct branch of the network, and none of these approaches are really exploited on a large scale
Difficulty in locating faults especially in compensated distribution networks

Method used

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  • Method and apparatus for detecting faults in three-phase electrical distribution network
  • Method and apparatus for detecting faults in three-phase electrical distribution network
  • Method and apparatus for detecting faults in three-phase electrical distribution network

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Embodiment Construction

[0053] Figure 1A Schematically shows an example of a compensated distribution network consisting of underground and / or overhead cables and / or overhead lines, along which a fault detector 10 according to the invention can be arranged and utilized to detect faults the passage of current.

[0054] The fault detector 10 may be arranged in connection with means for current determination of a medium voltage distribution network. The means for current determination may include current transformers, current sensors 3A-3C, Rogowski coils 3C, Hall sensors and the like. There may also be means for determining the voltage of the medium voltage distribution network, including for example measuring transformers, capacitive voltage dividers, resistive voltage dividers and the like.

[0055] Figure 1A and Figure 1B The distribution network in can have a radial structure or a radially operated mesh structure. Compensation can be achieved in a centralized, distributed or hybrid manner. T...

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Abstract

A method for detecting faults (4) in a three-phase electrical distribution network comprises determining a zero sequence current (21 C), a first phase current (21A) and a second phase current (21 B) at a location of the three-phase electrical distribution network, determining first filtered currents (22) by removing a frequency component from the determined currents corresponding to a fundamentalfrequency of the electrical distribution network through filtering out said frequency component, determining directions of the first filtered currents during a first time period (23), and comparing said directions (24) relatively to each other, and, if at least one of the determined directions is opposite with respect to at least one of the other two determined directions, signaling a detection ofa fault (25).

Description

technical field [0001] The present invention generally relates to the technical field of detecting faults in electrical distribution networks. In particular, the invention relates to the detection of earth faults in radially operated medium voltage distribution networks, such as in a compensated, centralized, distributed or mixed manner, or in networks with floating neutrals, by underground and / or Or overhead cables and / or overhead lines. Background technique [0002] During a line-to-earth (earth) fault, one phase of the distribution network is in contact with earth potential. This causes current to flow out of the network from the fault location and back into the network via the line-to-ground capacitance and / or via the grounding arrangement. This results in potentially dangerous touch voltages, and it is therefore important to recognize these fault conditions and disconnect the faulty part of the distribution (power) network. [0003] The fault may be a permanent groun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/16G01R31/02H02H3/34H02H7/28
CPCG01R31/085H02H3/165H02H3/343H02H7/28H02H7/267H02H1/0007H02H7/26
Inventor 塞波·佩蒂萨洛
Owner EMTELE OY
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