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Lock-up Protection Method of DC Motor in Electric Chassis Vehicle of High Voltage Switchgear

A high-voltage switchgear and DC motor technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of long response time, slow action, and unsatisfactory lock-rotor fault protection, and achieve the effect of eliminating interference factors and realizing dynamic adjustment.

Active Publication Date: 2019-06-21
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional DC motor stall protection is realized through fuses, temperature relays or judging that the starting time is too long. Although the structure is simple and easy to maintain, its action is slow, the response time is long, and the protection against stall faults that occur during the starting process is not sufficient. ideal

Method used

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  • Lock-up Protection Method of DC Motor in Electric Chassis Vehicle of High Voltage Switchgear
  • Lock-up Protection Method of DC Motor in Electric Chassis Vehicle of High Voltage Switchgear
  • Lock-up Protection Method of DC Motor in Electric Chassis Vehicle of High Voltage Switchgear

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] A blocking protection method for a DC motor in a high-voltage switchgear electric chassis vehicle, such as figure 1 As shown, specifically implement the following steps,

[0038] Step 1, collect the original operating current data i of the DC motor through the Hall current sensor, and use this current data as the stalled characteristic quantity of the DC motor,

[0039] Step 2, using the Daubechies6 wavelet algorithm to perform noise reduction analysis on the current data collected in step 1,

[0040] Wavelet denoising usually involves three parts: wavelet decomposition, threshold quantization of high-frequency coefficients obtained from wavelet decomposition, and wavelet reconstruction. Its denoising process is to maintain the profile a n On an unchanged basis, for each detail d i Do thresholding. That is to say, after determinin...

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Abstract

The invention discloses a high-voltage switch cabinet electric chassis truck DC motor rotation-clogging protection method, which comprises the following specific steps: 1) collecting original operation data of a DC motor as rotation-clogging characteristic quantity of the DC motor; 2) carrying out noise reduction analysis processing on the current data collected in the step 1); 3) determining a protection threshold set range; and 4) setting an actual protection value according to the threshold set range obtained in the step 3) and carrying out rotation-clogging protection. The method effectively eliminates the interference factors in the operation process and can quickly extract the rotation-clogging characteristic quantity, and realizes dynamic adjustment of the rotation-clogging protection threshold.

Description

technical field [0001] The invention belongs to the technical field of power distribution protection methods, and in particular relates to a blocking protection method for a DC motor in a high-voltage switch cabinet electric chassis vehicle. Background technique [0002] Under the background of the rapid development of digital and intelligent substations, the "hand crank" method to realize the operation of entering and exiting the circuit breaker in the switch cabinet can no longer meet the actual needs. With the advancement of the smart grid, the traditional hand-cranked chassis has been gradually replaced by the electric operating mechanism. While effectively improving work efficiency, it also provides a guarantee for the rapid restoration of power supply and the personal safety of maintenance personnel. [0003] However, due to the differences in manufacturing quality, use environment, working methods and daily maintenance of DC motors, failures of DC motors in electric c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
CPCH02H7/0811
Inventor 黄新波王海东薛智鹏朱永灿李志文
Owner XI'AN POLYTECHNIC UNIVERSITY
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