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Single-end distance measuring method based on self-adaptive current

A single-ended ranging and self-adaptive technology, applied in the fault location and other directions, can solve the problem of insufficient ranging accuracy, and achieve the effect of ensuring accuracy

Active Publication Date: 2011-08-10
STATE GRID ELECTRIC POWER RES INST +1
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Problems solved by technology

[0013] The technical problem to be solved by the present invention is to overcome the defect that the existing impedance method single-ended distance measurement has insufficient distance measurement accuracy when a metallic fault occurs on an ultra-high voltage long line, and when the line is compensated by different types of shunt reactors, it can Obtain ranging results with sufficient accuracy

Method used

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  • Single-end distance measuring method based on self-adaptive current
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  • Single-end distance measuring method based on self-adaptive current

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Embodiment Construction

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and examples. However, the invention is not limited to the examples given. Attached Figure 4 The specific steps of the flow chart are as follows:

[0049] 1) Use the traditional single-ended ranging algorithm to calculate the location of the fault point k = Result1.

[0050]2) Record the fault voltage and fault current of the ranging result calculated in step (1).

[0051] 3) Calculate the capacitive reactance and the current on the shunt reactor during the fault period, and obtain the corrected fault current. Due to the deviation of the ranging result at this time, the current on the capacitive reactance is biased, and the fault current cannot accurately reflect the current on the line. fault current.

[0052] 4) Using the corrected fault current, substitute it into the distance measurement algorithm to calculate the new distance measurement result Result2, ...

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Abstract

The invention discloses a single-end distance measuring method based on self-adaptive current, which comprises the steps of: introducing the current of a shunt reactor and distributing the current of a capacitor, and correcting the original fault current. The single-end distance measuring method has the benefits of being capable of realizing ultrahigh-voltage long-circuit single-end distance measurement of the shunt reactor, and guaranteeing measurement accuracy of.

Description

technical field [0001] The invention relates to a single-end distance measuring method using the impedance principle, in particular to a single-end distance measurement for ultra-high voltage long lines with shunt reactors. Background technique [0002] Single-ended ranging is an important part of line protection, especially in a complex line environment. Once a line fails, if it cannot be accurately located, the workload of line patrol personnel will be greatly increased. Nowadays, single-ended ranging and double-ended ranging are widely used in line protection devices. Double-ended ranging requires double-ended information, which can only be used in longitudinal differential line protection, and the conditions for optical fiber communication are not mature. Single-ended ranging is the most widely used in some areas. Impedance method is a single-ended ranging method with simple principle and relatively mature development. In addition, the single-ended ranging method based ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 余洪苏理吴通华张哲郑玉平
Owner STATE GRID ELECTRIC POWER RES INST
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