TRV waveform enveloping line and standard value parameter calculation method based on coordinate system transfer

A technology of coordinate system conversion and parameter calculation, applied in complex mathematical operations, circuit breaker testing, measuring devices, etc.

Active Publication Date: 2017-12-15
XIAN HIGH VOLTAGE APP RES INST CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide the TRV (transient recovery voltage) waveform envelope and standard value parameter calculation method based on coordinate system conversion, solve the TRV waveform that calculates by emulation software or large-capacity test station short-circuit breaking test draws Technical Problems of Envelope Realization and Standard Value Reading

Method used

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  • TRV waveform enveloping line and standard value parameter calculation method based on coordinate system transfer
  • TRV waveform enveloping line and standard value parameter calculation method based on coordinate system transfer
  • TRV waveform enveloping line and standard value parameter calculation method based on coordinate system transfer

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Embodiment 1

[0052] Such as figure 1 As shown, the calculation method of the TRV (transient recovery voltage) waveform envelope and standard value parameters based on coordinate system conversion, for the TRV waveform with two parameters, includes the following steps:

[0053] 1) Through the TRV waveform data, search for the starting point of TRV, and set the threshold of the increment in the y-axis direction as Γ y , search for the increment between one point and the next point in the y-axis direction in the Cartesian coordinate system is greater than the threshold Γ y , then define this point as the starting point of TRV data (x 0 ,y 0 );

[0054] 2) With the starting point as the origin of the Cartesian coordinate system, the change formula for converting the data in the first quadrant of the coordinate system from the Cartesian coordinate system (x, y) to the polar coordinate system (r, θ) is:

[0055]

[0056] In the formula, r is the polar diameter in polar coordinates, and θ ...

Embodiment 2

[0067] Such as figure 2 As shown, the calculation method of TRV (transient recovery voltage) waveform envelope and standard value parameters based on coordinate system conversion, for a concave four-parameter TRV waveform, includes the following steps:

[0068] 1) Steps 1) to 5) of Embodiment 1 are used to calculate the first tangent line, the second tangent line and the third tangent line tangent to the TRV waveform data.

[0069] 2) In the Cartesian coordinate system, point As the starting origin, set the step size of the origin in the y-axis direction as +Δy, and establish a local coordinate system in the y-axis direction in the loop operation, and the established local coordinate system x-axis is opposite to the global coordinate system, and y Axes are reversed from the global coordinate system.

[0070] 3) In the first calculation, the first quadrant and the interval in The data consists of the origin of the local Cartesian coordinate system Convert to polar coord...

Embodiment 3

[0076] Such as image 3 , Figure 4 As shown, the calculation method of TRV (transient recovery voltage) waveform envelope and standard value parameters based on coordinate system conversion, for a concave four-parameter TRV waveform, includes the following steps:

[0077] 1) Steps 1) to 5) of Embodiment 1 are used to calculate the first tangent line, the second tangent line and the third tangent line tangent to the TRV waveform data.

[0078] 2) In the Cartesian coordinate system, point As the starting origin, set the step size of the origin in the y-axis direction as +Δy, establish a local coordinate system that increases in the y-axis direction in the loop operation, and the x-axis of the established local coordinate system is opposite to the global coordinate system, and y Axes are reversed from the global coordinate system.

[0079] 3) In the first calculation, the first quadrant and the interval in The data consists of the origin of the local Cartesian coordinate s...

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Abstract

The invention discloses a TRV (transient recovery voltage) waveform enveloping line and standard value parameter calculation method based on coordinate system transfer. By converting TRV waveform data which is obtained through simulation software calculation or high-capacity tests station short-circuit breaking tests to a polar coordinate system from a Descartes coordinate system, in this way, an enveloping line which is constituted by three straight lines (two parameter TRV) tangent to TRV waveforms or four enveloping straight lines (four parameter TRV) tangent to TRV waveforms, and standard value parameters of the TRV are calculated. The obtained TRV standard value parameters provide theoretical basis for adjusting test loops R, L C element parameters during expected TRV debugging and reading and assessing TRV parameters after tests when a high-capacity test station conducts short circuit cut-off tests.

Description

technical field [0001] The invention belongs to the technical field of large-capacity short-circuit breaking test of high-voltage AC circuit breakers, and in particular relates to a calculation method of TRV (transient recovery voltage) waveform envelope and standard value parameters based on coordinate system conversion. Background technique [0002] When the high-voltage circuit breaker breaks the short-circuit fault of the power system, when the arc current crosses zero and extinguishes, the fracture will bear the transient recovery voltage (ie: TRV) generated by the electromagnetic oscillation of the system. After decades of research and empirical statistical analysis, IEC and IEEE have obtained two typical methods of standard TRV waveforms, namely the two-parameter method (see figure 1 ) and the four-parameter method (see figure 2 , image 3 , Figure 4 ), and the four-parameter method can be divided into concave shapes according to the waveform characteristics (see...

Claims

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Application Information

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IPC IPC(8): G06F17/17G01R31/327
CPCG01R31/3275G06F17/17
Inventor 高享想刘浩军李刚董玮刘朴
Owner XIAN HIGH VOLTAGE APP RES INST CO LTD
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