Distribution line single-phase break line judgment and positioning method based on line voltage vector criterion

A technology of distribution line and positioning method, which is applied in the field of power grid power, can solve the problems of easy misjudgment, easy misjudgment, inconvenient installation of devices, etc., and achieves the effects of small voltage fluctuation, convenient installation and implementation, and wide monitoring range.

Active Publication Date: 2015-07-15
福建省银邦电力工程有限公司
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Problems solved by technology

[0003] The disadvantage is that the precondition of the above judgment method is that the three-phase circuit is required to be completely symmetrical. However, when a phase disconnection occurs in the actual operating grid, the changes in the magnitude of the three-phase current are not necessarily obvious, so it is easy to cause misjudgment.
It is easy to misjudgment when the line is empty-loaded, light-loaded, or unbalanced three-phase load, and it...

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  • Distribution line single-phase break line judgment and positioning method based on line voltage vector criterion
  • Distribution line single-phase break line judgment and positioning method based on line voltage vector criterion
  • Distribution line single-phase break line judgment and positioning method based on line voltage vector criterion

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Embodiment Construction

[0041] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] 1. Analysis of the change of line voltage when one phase is disconnected when the three phases are symmetrical.

[0043] In an ideal state, the neutral point is not grounded or the small current is grounded. The three-phase power supply voltage of the line ABC of the distribution network system is completely symmetrical. The voltages of the three-phase lines at the position are equal in magnitude, and the phase angles differ by 120°. Let the effective value of the voltage of the AB phase lines be U N , the phase angle is 0 degrees, the circuit diagram is as follows Figure 1a As shown, the three-phase line voltage vector diagram is as follows Figure 1b As shown, the phase-to-line voltage vectors can be expressed as follows:

[0044]

[0045]

[0046]

[0047] The corresponding relationship between the ...

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Abstract

The invention discloses a distribution line single-phase break line judgment and positioning method based on a line voltage vector criterion. The distribution line single-phase break line judgment and positioning method comprises the following steps: step A, acquiring and counting three-phase line voltage; step B, verifying the three-phase line voltage vector; step C, judging a break line fault; step D, outputting the judgment result; step E, positioning the break line fault section. The distribution line single-phase break line judgment and positioning method disclosed by the invention has the following benefits: 1. the voltage vector is used as the parameter for judging the break line fault and is a little influenced by the three-phase load change situation, so that the break line fault can be normally recognized under the situations of no-load, light load, heavy load and three-phase load imbalance of the line; 2. the three-phase mains voltage fluctuation is low in influence; 3. the range of surveillance is wide, and a break line monitoring device can accurately judge and recognize the single-phase break line of the line from the mounting position to a line power supply; 4. the break line monitoring device is convenient to mount and implement and is mounted by a parallel connection method, and the existing three-phase voltage transformer on the line can be directly used as a voltage measurement input device.

Description

technical field [0001] The invention relates to the technical field of grid electric power, in particular to a method for judging and locating a single-phase disconnection of a distribution line based on a line voltage vector criterion. Background technique [0002] At present, most of the overhead line disconnection fault judgment methods are to judge the line disconnection based on the current amplitude, phase and the relative relationship between the amplitude changes between phases, such as the patent application number (201310247895.4) which is applicable to The disconnection alarm device of 6~35kV distribution network, its principle and characteristics are: measure and compare the amplitude and phase of the A-phase and C-phase current of the main line and the branch line of the distribution line, so as to determine the disconnection phase; used for judging One-phase disconnection fault on the rear side of the measurement point (that is, away from the power supply side)...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 王金泽王成楷苏志龙
Owner 福建省银邦电力工程有限公司
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