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Capacitance meter, method, and computer program product for improved capacitance measurement

A computer program, technology of capacitance meter, applied in the field of capacitance meter

Inactive Publication Date: 2011-04-20
ABB TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this strategy still allows for significant interference from the mains current, thus requiring further reduction of interference from surrounding mains currents when measuring capacitance

Method used

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  • Capacitance meter, method, and computer program product for improved capacitance measurement
  • Capacitance meter, method, and computer program product for improved capacitance measurement
  • Capacitance meter, method, and computer program product for improved capacitance measurement

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Embodiment Construction

[0032] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will convey the present invention to those skilled in the art. the scope of the invention. Like numbers refer to like elements throughout the specification.

[0033] figure 1 is a schematic diagram showing a capacitance meter 1 according to an embodiment of the present invention, with emphasis on elements used to measure the capacitance of a capacitor 3 . It will be noted that although the capacitive influence of capacitor 3 is dominant, there may be resistive and inductive components of capacitor 3 and / or the wiring connecting capacitor 3 and capaci...

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Abstract

A capacitance meter including an AC source providing a measurement voltage with a measurement frequency to a capacitor. A current sensor is arranged to measure a current going to or from the capacitance meter. A voltage sensor is arranged to measure a voltage over the capacitor. A capacitance calculation unit is arranged to calculate, using a controller, a capacitance of the capacitor using a measured current from the current sensor, a measured voltage from the voltage sensor and the measurement frequency. The capacitance meter is arranged to obtain measurements using the current sensor and the voltage sensor during a measurement duration. The measurement frequency and the measurement duration are selected such that the measurement duration equals a multiple of the period of the measurement frequency, and the measurement duration equals a multiple of the period of a mains electricity.

Description

technical field [0001] The present invention relates to a capacitance meter, a method, a computer program and a computer program product for improved capacitance measurement. Background technique [0002] Since the inception of capacitors, it has been necessary to measure the main quantity of capacitors, namely capacitance. [0003] One known way of measuring capacitance is to connect an alternating current to the capacitor and observe the voltage. [0004] Since alternating current is used, the current may be influenced by the mains current near the capacitor, the capacitance meter, or the cable connecting the two. It is known to select a frequency for alternating current that is not a multiple of 50 Hz or 60 Hz of the mains frequency. For example it is known to choose frequencies such as 111 Hz and 222 Hz to reduce any influence of the fundamental frequency and harmonics of the mains current. However, this strategy still allows significant interference from the mains cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor H·O·弗罗杰德
Owner ABB TECH AG
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