Blocking reverse closing method based on voltage mutation and three-sequence component asymmetry

A voltage mutation and sequence component technology, applied to electrical components, emergency protection circuit devices, fault locations, etc., can solve short-term power outages on the opposite side line, PT cannot detect residual voltage, and cannot detect three-phase voltage on both sides and other issues to achieve the effect of improving the sensitivity

Active Publication Date: 2020-05-19
XI AN JIAOTONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, strategy (2) has the following problems: Considering economy and easy construction and installation, in engineering applications, a single power supply PT is generally installed on the power supply side and the load side, and the PT provides power supply and line voltage detection for the terminal, which cannot be detected Three-phase voltage on both sides, when the two phases connected to the PT have a short circuit and a short-circuit ground fault, a three-phase short circuit and a short-circuit ground fault, such as a two-phase short circuit between UA and UB, the PT cannot detect the residual voltage, and the segmented automatic switch reverses The blocking function fails, and the opposite side substation protection trips when the contact automation switch is transferred, the fault isolation area expands, and a short-term power failure occurs on the opposite side line

Method used

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  • Blocking reverse closing method based on voltage mutation and three-sequence component asymmetry
  • Blocking reverse closing method based on voltage mutation and three-sequence component asymmetry
  • Blocking reverse closing method based on voltage mutation and three-sequence component asymmetry

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Experimental program
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Embodiment Construction

[0031] exist figure 1 In the implementation system described above, according to the feeder unit construction mode, a feeder segment point S is equipped with a segmented automatic load switch, and the contact point L is configured with a contact automated load switch (normally open state); wherein the segmented automated load switch has a voltage sequencer. The reverse locking function of component asymmetry, the contact automatic load switch has the reverse locking function of phase voltage mutation, and each automatic switch controller is equipped with a 2-minute backup power supply.

[0032] The following is combined with a system architecture figure 1 Combined with the reverse blocking strategy process figure 2 , elaborating on segment B ( image 3 Between S11 and S12) Troubleshooting. The processing is as follows:

[0033] (1) Each automatic switch collects the three-phase voltage in real time, and the effective value of the rated voltage of the distribution network ...

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Abstract

The invention discloses a blocking reverse turn-on method based on voltage abrupt change amount and three-sequence component asymmetry. In voltage-time-type feeder automation, the downstream automation switch of a fault point is blocked and turned on reversely according to the sequence component asymmetry, and an interconnection automatic switch blocks the interconnection transfer according to thesudden change amount of the voltage positive sequence component. The method adapts to asymmetric faults and symmetrical faults, provides a new reverse locking turn-on strategy, and improves the reverse locking turn-on sensitivity, thereby improving the accuracy of positioning and isolation of the local feeder automation fault section.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault isolation, and in particular relates to a method for automatic locking and reverse closing of a distribution network voltage-time feeder. Background technique [0002] At present, the construction of distribution network has become a key part of the development of my country's smart grid. Improving the reliability of power supply is an important goal of the construction of smart distribution network. The probability of failure in my country's distribution network is high. A large number of statistics show that more than 85% of the failures are blackouts. In the distribution network, the location and isolation of the fault section is an important strategy to improve the reliability of the power supply, and the feeder automation is the main means for the location and isolation of the fault section of the distribution line. [0003] The voltage-time feeder automation is applied to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCY04S10/52
Inventor 宋国兵张维常仲学刘健郭上华张志华
Owner XI AN JIAOTONG UNIV
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