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Method and device for detecting faults in a three-phase power distribution network

A power distribution network and fault technology, applied in the direction of circuit devices, fault locations, emergency protection circuit devices, etc., can solve the problems of difficulty in 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: 2020-04-14
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 device for detecting faults in a three-phase power distribution network
  • Method and device for detecting faults in a three-phase power distribution network
  • Method and device for detecting faults in a three-phase power 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 a fault (4) in a three-phase distribution network comprising determining the zero-sequence current (21C), the first phase current (21A) and the second phase current at a location in the three-phase distribution network (21B) Determining (22) a first filtered current by removing frequency components from the determined current corresponding to the fundamental frequency of the distribution network by filtering out the frequency components, determining (23) at the first direction of the first filtered current during the time period, and comparing the directions relative to each other (24), and if at least one of the determined directions is opposite relative to at least one of the other two determined directions , to signal a detected 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 Patents(China)
IPC IPC(8): G01R31/08H02H3/16H02H3/34H02H7/28
CPCG01R31/085H02H3/165H02H3/343H02H7/28H02H7/267H02H1/0007H02H7/26
Inventor 塞波·佩蒂萨洛
Owner EMTELE OY
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