Method of online testing for an intermediate link

A link and test signal technology, applied in the field of dynamic behavior and its electrical component values, detection of control and detection units that deviate from the nominal behavior or value, can solve the problem that it is difficult to identify the source of damage, the integrity and function are not determined, etc. question

Inactive Publication Date: 2009-08-19
BOMBARDIER TRANSPORTATION GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently, different solutions are used to monitor line harmonics, but there are no dedicated tests to determine the integrity and functionality of the intermediate link during operation
More specifically, while line harmonics can be monitored, it is difficult to identify the source of the damage

Method used

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  • Method of online testing for an intermediate link
  • Method of online testing for an intermediate link
  • Method of online testing for an intermediate link

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] Example 1: Main Capacitor Failure

[0043] For a main capacitor with 12mF C zk1 The intermediate voltage link, the line frequency is 16.7Hz. According to these values, the filter inductance L sk should be 2.02mH and the filter capacitor C sk Should be 11.25mF. pass Figure 4 The solid line in shows the transfer function assuming all these elements take nominal values.

[0044] In this first example, it is assumed that the main capacitance is reduced to 20% below its nominal value. pass Figure 4 The dashed line in shows the actual transfer function. By choosing a stimulus test signal 92 with a frequency of 48 Hz, the expected (nominal) phase shift is -74° (point A). In the fault case, in fact, as indicated by point B in the figure, the phase shift will be greater than 60°.

example 2

[0045] Example 2: Filter capacitor failure

[0046] Assuming the same mid-link voltage is used and the filter capacitor C sk The value is reduced to 20% below its nominal value. The first test is again performed with the test signal 92 excited at a harmonic of 48 Hz. As a result, failures will be detected by obtaining a phase shift similar to that in the first example. To obtain more detailed information, a second test can be performed with a second stimulus test signal 92 at 35 Hz. In the case of a faultless intermediate link or even with the main capacitor C zk1 In case of a fault, the phase shift is greater than 70° as indicated by point C. in the filter capacitor C sk In the event of a fault, the phase shift as Figure 5 Midpoint D is less than -75°. Therefore, using a two-step process allows for a more detailed determination of the fault.

[0047] Many other variations of the invention are also possible. In particular, while reference is made to a sinusoidal stim...

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PUM

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Abstract

A method of testing the integrity of electrical components in the intermediate voltage link between an electrical supply circuit and the drive circuit of an electrical vehicle is disclosed. According to the method the intermediate link is excited with a first test signal, and the system response to the test signal is measure and compared with an expected response. In the event of a deviation between the system response and the expected response, an error signal is generated. An intermediate voltage link incorporating a testing device for carrying out the method is also disclosed.

Description

technical field [0001] The invention relates to a method for testing electrical components, and more particularly to a method for determining the dynamic behavior of an intermediate voltage link and the values ​​of its electrical components. The invention also relates to equipment for carrying out such tests, and more particularly to control and detection units for detecting deviations from nominal behavior or values. In particular, the methods and devices are applicable to intermediate circuits used in rail vehicle supply networks. technical background [0002] A common form of intermediate voltage link is a direct current (DC) electrical connection between an alternating current / direct current (AC / DC) converter and a direct current / alternating current (DC / AC) converter. This arrangement can be used in the power supply of electric rail vehicles. In this case, the first converter may be connected via a single-phase transformer to receive power from, for example, an overhea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/42B60L3/00G01R31/34
CPCG01R31/343B60L2200/26G01R31/42B60L3/003
Inventor 彼得·黑泽
Owner BOMBARDIER TRANSPORTATION GMBH
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