Capacitor operation state online monitoring method based on PCB Rogowski coil

A Rogowski coil and operating state technology, applied in the field of power electronics, can solve the problems of not being able to be popularized and used on a large scale, inconvenient practical application, unfavorable popularization and application, etc., and achieve the benefits of large-scale widespread use, low power consumption, and low cost Effect

Active Publication Date: 2020-05-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the calculation method based on the circuit model is greatly affected by the various devices in the circuit. The change of any factor will lead to the change of the actual transmission information, and the final result will also deviate greatly from the actual; the sensor-based measurement method often uses additional The sensor measures the ripple voltage and ripple current of the capacitor, and then obtains the capac

Method used

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  • Capacitor operation state online monitoring method based on PCB Rogowski coil
  • Capacitor operation state online monitoring method based on PCB Rogowski coil
  • Capacitor operation state online monitoring method based on PCB Rogowski coil

Examples

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Embodiment

[0050] Taking the HCG F5A capacitor as an example, the relevant parameters of the capacitor are shown in Table 1, and the structure diagram of the PCB Rogowski coil used is shown in figure 1 shown.

[0051] Table 1 HCG F5A related parameters

[0052] Related parameters value Capacitance / MFD 10000 Rated DC voltage / VDC 400 Bolt diameter / mm 10 Bolt spacing / mm 32

[0053] The first step is to obtain a=6.5mm, b=20mm, r=5mm, R=21mm according to the relevant parameters in Table 1 and draw the PCB Rogowski coil accordingly.

[0054] The second step, such as image 3 As shown, the power is taken from the positive and negative poles of the capacitor respectively, through a multi-stage parallel Darlington structure, and then the voltage regulator chip is connected to supply power to the entire system; at the same time, the ripple voltage and DC voltage at both ends of the capacitor are directly sampled by the isolated op amp.

[0055] In the thi...

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Abstract

The invention discloses a capacitor operation state online monitoring method based on a PCB Rogowski coil. The method uses a PCB Rogowski coil as a current sensor for online monitoring, and comprisesthe following steps: (1) designing a corresponding PCB Rogowski coil according to an actually monitored capacitor, and sleeving the PCB Rogowski coil on any pole of the capacitor to measure ripple current of the capacitor; (2) obtaining ripple voltage and DC voltage of the capacitor by using an isolation operational amplifier; (3) filtering the ripple current and the ripple voltage and inputting the ripple current and the ripple voltage into a microcontroller; (4) measuring the temperature of the capacitor shell to indirectly obtain the core temperature of the capacitor; (5) looking up a tableor calculating to obtain an ESR initial value at the core temperature of the capacitor in step (4); and (6) calculating the ripple voltage and the ripple current of the capacitor to obtain the real-time ESR of the capacitor, comparing the real-time ESR with the initial ESR to obtain the operation state of the capacitor, and finally transmitting the information to a data center. According to the invention, the operation state of the capacitor can be monitored in real time.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an online monitoring method for capacitor operating states based on PCB Rogowski coils. Background technique [0002] Capacitors are an integral part of most power electronic devices. According to statistical analysis, the failure of power electronic equipment is mostly due to the damage of capacitors, especially electrolytic capacitors. In order to avoid greater losses after capacitor failure, it is best to replace the capacitor before it is about to fail. The reliability and expected life of the device are studied. At present, the reliability and life prediction of capacitors are mostly based on various technical manuals and life prediction models, but the actual reliability and life estimates based on technical manuals and life prediction models are very different from the actual ones. Therefore, it is necessary to monitor the state of capacitors. The m...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R15/18G01R27/08
CPCG01R31/00G01R15/181G01R27/08
Inventor 雷万钧王蒙吕高泰
Owner XI AN JIAOTONG UNIV
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