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Transmission line fault detection method based on current-current derivative two-dimensional space

A transmission line, two-dimensional space technology, applied in the direction of detecting faults by conductor type, fault location, information technology support system, etc., can solve problems such as transmission line fault detection, and achieve strong anti-synchronization ability and small calculation amount.

Active Publication Date: 2020-01-17
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is a transmission line fault detection method based on the current-current derivative two-dimensional space, which can effectively solve the problem of protection transmission line fault detection under high-resistance grounding faults, information asynchronous, etc.

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  • Transmission line fault detection method based on current-current derivative two-dimensional space
  • Transmission line fault detection method based on current-current derivative two-dimensional space
  • Transmission line fault detection method based on current-current derivative two-dimensional space

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Embodiment Construction

[0039] The technical content of the present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

[0040] figure 1 The flow chart of the transmission line fault detection method based on the current-current derivative two-dimensional space provided by the present invention, the embodiment

[0041] Using the electromagnetic transient simulation software PSCAD / EMTDC to build IEEE39 node system, the system structure diagram is as follows figure 2 shown. figure 2 The circled G in the middle represents the generator, and the serial numbers 1 to 39 are the numbers of each busbar. The system voltage level is 345kV, the frequency is 50Hz, and the sampling frequency is 10kHz, that is, the time difference between two adjacent sampling moments is 0.0001s. Set the fault in the IEEE39 node system, extract the corresponding fault data, and program in MATLAB to realize the fault detection method.

[0042] In the IEEE39 node system, the...

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Abstract

The invention discloses a transmission line fault detection method based on a current-current derivative two-dimensional space. Currents of the two sides of a transmission line are acquired, fault detection is started according to a conventional sudden change current, current derivatives of various moments in a quarter period after an original sudden change moment are calculated, and the number ofthe current derivatives greater than or less than zero are counted; quadrants of the current derivatives in the period on the two sides of the line are determined, and a true sudden change moment t1and a true finish moment t2 of the quarter period are checked and determined; and for the current derivatives of all moments from t1 to t2, the quadrant satisfaction rates of the two sides are calculated, the quadrant of the current derivatives in the first quarter period after the currents of the two sides change suddenly is accurately judged, and then the line fault condition is detected. The transmission line fault detection method can accurately detect out line faults under various fault scenes, is not influenced by transition resistance, has a low requirement for the synchronicity of thecurrents on the two sides and has the high desynchrony resistance.

Description

technical field [0001] The invention relates to the technical field of fault detection of power grid transmission lines. Background technique [0002] At present, most of the existing protection algorithms use the Fourier algorithm, and the current signals of each phase are used for current protection, and can participate in the calculation of the directional element, but the current protection is easily affected by the transition resistance, and the directional element has a certain dead zone, which is affected by The influence of signal synchronization on both sides. [0003] Aiming at the shortcomings of existing current protection algorithms, the present invention proposes a transmission line fault detection method based on the current-current derivative two-dimensional space. Its advantage is that by using the current sampling values ​​of each phase on both sides of the line, the fault line can be accurately detected about 1 / 4 cycle after the fault occurs, and the amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 童晓阳
Owner SOUTHWEST JIAOTONG UNIV
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