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A dichotomous test method for voltage sag withstand capability

A technology of voltage sag and test method, applied in the direction of testing dielectric strength, etc., can solve the problems of poor accuracy and low workload, and achieve the effect of accurate tolerance, accurate test and guaranteed accuracy

Active Publication Date: 2019-02-19
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] The workload of the test method recommended by the C4.110 working group is fixed and very low, because it only fixes three test points for testing, which also leads to the worst accuracy and only approximate results

Method used

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  • A dichotomous test method for voltage sag withstand capability
  • A dichotomous test method for voltage sag withstand capability
  • A dichotomous test method for voltage sag withstand capability

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment follows part of the test plan in the IEEE1668 standard, such as its maximum test time (2s) and amplitude change (0-85%). After a brief initial test, the minimum time was set to 0s, in order to include some particularly sensitive devices.

[0051] In this embodiment, an amplitude step size of 2% is set, because if the step size is too large, the test accuracy will be reduced, and if the step size is too small, the workload will be greatly increased. And keep the amplitude of the voltage sag unchanged, and determine the time point of the voltage sag test based on the dichotomy method. First, test the minimum and maximum values ​​of the voltage sag duration. The time is the median of these two times, and the duration of the next test is the median of the duration of the device tripping situation at this median time and the...

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Abstract

The invention discloses a dichotomy test method for the voltage sag withstanding capability. According to the method, a voltage sag amplitude is determined and a fault situation of a device within maximum duration time Tmax at the amplitude is tested; to be specific, the device has no fault within the maximum duration time, the device withstands the voltage sag at the amplitude and testing is stopped; and if a fault occurs at the device within the maximum duration time and the device works normally at a minimum duration time point, next testing duration time is a mid value between the maximumduration time and the minimum duration time; and the rest of the process is done in the same manner and next testing duration time is a mid value between the testing duration time of a detected deviceand the testing duration time of the tested device in a last different state until a difference between Tn and Tn+1 does not exceed 5ms. According to the method disclosed by the invention, the voltage sag withstanding capability testing is done accurately; while the high precision is ensured, the work load needed by the testing is reduced substantially; and thus the testing time is saved and thetesting is completed precisely and quickly.

Description

technical field [0001] The invention relates to the technical field of voltage drop tolerance testing, in particular to a dichotomous testing method for voltage sag tolerance. Background technique [0002] Electrification is known as the greatest engineering achievement of the 20th century, and the power grid is also known as the most complex man-made network in the world. It is now considered to be the most basic condition of life. The power quality of today's power supply generally meets the needs of ordinary consumers, but there may still be significant changes due to time or region, which causes voltage interruptions or abnormal voltages to occur frequently, although in some places people also accept This situation. However, in today's highly developed industrial and digital economy era, the production process has higher requirements for power quality. These customers require higher power quality and more reliable power supply, and they hope to reduce voltage interrupt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 汪颖肖先勇桂良宇李长松
Owner SICHUAN UNIV
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