Harmonic diagnosing method for electric facility

A technology of electrical equipment and diagnostic methods, which is applied in the field of harmonic diagnosis, and can solve problems such as energy-saving function and protection function degradation, robot failure, motor failure, etc.

Active Publication Date: 2006-03-15
ZHONGKUANG LONGKE ENERGY TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During this period, converters often cause their functions such as energy saving function and protection function to deteriorate, and cause abnormal...

Method used

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  • Harmonic diagnosing method for electric facility
  • Harmonic diagnosing method for electric facility
  • Harmonic diagnosing method for electric facility

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Embodiment

[0111] With the embodiments of the present invention, calculated values ​​for diagnosis and Kth order harmonic functions necessary for deterioration judgment of a motor and an inverter will be described by citing specific examples. However, the present invention is not limited to this embodiment. In the following description, H k is the Kth order harmonic component.

[0112] (1) Diagnosis of the motor (diagnosis of the main body of the motor). When K=2, 3, 4, 5, Σ takes K=2 to 5. found C. k The procedure is as follows.

[0113] 1M o (∑H 2 k ) 1 / 2

[0114] 2A k =H k / M o

[0115] 3T o =∑A k

[0116] 4C k =A k / T o

[0117] On the other hand, f(M k ) can be the following values. In the following numerical formula, I k Indicates the indicated value of the kth order harmonic.

[0118] f(M 2 )=S 1 ×(∑I k -I 3 2 )

[0119] f(M 3 )=S 2 ×(∑I k -I 3 3 )

[0120] f(M 4 )=S 1 ×(∑I k -I 4 )

[0121] f(M 5 )=S 2 ×(∑I k -I 3 5 )

[0122] In the...

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Abstract

The invention relates to a method for diagnosing deterioration by comparing indicated values. An indicated value is obtained by the relative harmonic component of each order current harmonic flowing into a motor and a converter dividing the total harmonic distortion of a preset order of the current harmonic, a standard value is obtained by a calculated value multiplied by a harmonic function of each formation order of the indicated value, to be used to diagnose each order found by calculation from the relative harmonic component of each order. In the method, the deterioration degrees of the motor and the converter are distinguished through a weighted standard value, and deterioration parts are determined through the concrete harmonic order of the current harmonic.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment diagnosis, and relates to a harmonic diagnosis method for electrical equipment such as motors and converters. Background technique [0002] Recent electrical equipment has been trying to increase productivity through continuous and integrated production processes. Furthermore, energy-saving devices such as inverters have been widely introduced together with highly automated execution systems in order to obtain very reliable equipment. Such mass production is required in various industrial fields. [0003] Mass production equipment usually operates continuously, whereas failures (stops) in electrical equipment often bring the entire process to a standstill. Once a failure occurs, it will not only endanger the production process but also lose user trust, and even cause catastrophic consequences. Thus, the loss of downtime is immeasurable and can lead to a fatal problem. [0004] Sin...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 高博
Owner ZHONGKUANG LONGKE ENERGY TECH BEIJING
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