A shunt capacitor detection method based on intelligent substation
Focused on the problems that capacitor branches parameters cannot be calculated with unknown neutral point voltage, a shunt capacitor detection method based on intelligent substation is proposed in this paper. Using the information from intelligent substation, basic equation of shunt capacitor is firstly constructed in consideration of capacitor operating …
Electrolytic capacitor surface defect detection based on deep ...
In this study, a real-time object detection algorithm based on an improved single shot multibox detector (SSD) is proposed to achieve omnidirectional surface defect …
Machines | Free Full-Text | A Literature Review of Fault Detection and Diagnostic Methods …
2 · This review paper offers a comprehensive examination of the various types of faults that occur in inverters and the methods used for their identification. The introductory segment investigates the internal component failures of voltage-source inverters (VSIs), examining their failure rates and the consequent effects on the overall system …
Self-detection method for measurement error of capacitor voltage …
Capacitor voltage transformers (CVTs) are widely used in high-voltage power systems. Their main problem is poor stability in measurement errors. ... A method for monitoring the metering performance of an EVT on-line based on …
An online detection method for capacitor voltage transformer …
In this paper, an online detection method based on load classification has been proposed. Several identification parameters are first put forward to classify loads. With these parameters, low-load modeling and monitoring data of the period of industrial users stably out of operation are screened out.
Capacitor Detection in PCB Using YOLO Algorithm
This paper proposes a capacitor detection method based on YOLO algorithm for printed circuit board (PCB) assembly. YOLO is a kind of fast object detection method based on convolutional neural network …
Working Principle and Detection Method of Film Capacitor
Ⅲ The Method for Detecting the Quality of A Film Capacitor Is As Follows: 1) First look at the appearance, if there is a problem with the appearance, the film capacitor is likely to have problems. 2) Test the two legs of the film with a multimeter resistance file to be very high resistance.
Capacitor Detection in PCB Using YOLO Algorithm
This paper proposes a capacitor detection method based on YOLO algorithm for printed circuit board (PCB) assembly. YOLO is a kind of fast object detection method based on convolutional neural network (CNN). The deep network architecture of CNN can so we ...
Comparison of on-line partial discharge detection methods for HV …
The capacitive coupler, acoustic emission (AE) sensor and radio frequency current transducer (RFCT) have been used to detect partial discharge (PD) activity within a 132 kV prefabricated cable joint containing a known defect. Although each of the three methods has been applied individually under different situations, a …
Recent Advances of Capacitive Sensors: Materials, …
In recent, Li et al. [] used 3D printing method with carbon fibers to endow the capacitive pressure sensor with body motion detection capability. The sensor can be attached to human joints including fingers, knees, and elbows to detect the limb motions and covert the motion to readable electric signals. [ 27 ]
ADVANCED METHODS IN CAPACITOR DEFECT FAILURE …
contrast of areas with higher current density. All returned devices exhibited areas of high current density at the metal seams of the capacitors. Figure 2. Left image shows the standard thermal IR spectroscopy using the FLIR SC6700 of capacitor in question with 0.7
Sensorless Capacitor Voltage Detection Method of Cascaded H …
The cascaded H-bridge (CHB) static synchronous compensator (STATCOM) has been widely used in wind farm and conflux station. As the grid-connected voltage increases, the number of CHB proportionately increases. In order to achieve the capacitor voltage balance, it is necessary to independently detect the capacitor voltage …
FDC1004: Basics of Capacitive Sensing and Applications
Capacitive sensing is becoming a popular technology to replace optical detection methods and mechanical designs for applications like proximity/gesture detection, …
Self-detection method for measurement error of capacitor voltage ...
The measurement error of capacitor voltage transformers (CVTs) has poor stability under the complex environment of substations. Conventionally, error detection is …
Capacitor Detection in PCB Using YOLO Algorithm
Experimental results show all the types of capacitors in PCB can be detected and the average detection time is less than 0.3 second, which is fast enough to develop an on-line PCB assembly …
Liquid Level Sensing Using Capacitive-to-Digital Converters
Introduction Procedures such as infusions and transfusions require exact amounts of liquid to be monitored, so they need an accurate, easy-to-implement method for sensing liquid level. This article describes the 24-bit capacitive-to …
The detection of partial discharge (PD) activities in high-voltage equipment can be conducted according to several mechanisms of signal detection, including electromagnetic wave signal detection, acoustic signal detection, chemical reactions, electrical signal detection, and optical emission detection. Recently, multiple …
Discovering and reducing defects in MIM capacitors
Although the ramp-to-failure method is destructive, it is 100% effective in detecting extrinsic capacitors, regardless of their underlying cause. While faster ramp rates lead to more optimistic (i.e. higher) predictions of the life-ending failure voltage, the speed of ramp doesn''t seem to change the delineation of intrinsic and extrinsic failure types.
Self-detection method for measurement error of capacitor …
The engineering operation data of three-phase CVTs were collected to validate the proposed method. The results show that the error changes detected by the …
Comprehensive detection method for multi-contaminants in …
Acoustic and capacitive methods can detect solid contaminants and air bubbles in oil [7], [8]. Among these methods, inductive method [9], [10] can identify the magnetism of metal debris, which has developed rapidly and is applied to the health monitoring of rotating and reciprocating machine.
Resonant frequency detection and adjustment method for a capacitive …
The capacitive transducer with differential transformer bridge is widely used in ultra-sensitive space accelerometers due to their simple structure and high res
Detecting breakdowns in capacitor voltage transformers: A …
Thus, detecting and locating breakdown capacitors over time is crucial for maintaining CVTs and the grid steady. ... This paper proposes an end-to-end method to detect existing or future breakdowns in CVTs with …
Fast plug-in capacitors polarity detection with morphology and SVM fusion method …
Defect detection is a critical element in the PCB manufacturing process. Different from surface mount PCB, the components on the plug-in PCB are usually installed manually, resulting in significant errors. We make contributions in the following two aspects: (1) a framework and measurement method of a light source and make a cheap and …
Common capacitors detection methods and experience
Different methods must be used according to different components to judge whether the components are normal or not. 1. Detection of fixed capacitors. A. Detecting small capacitors below 10pF Because the fixed capacitor capacity below 10pF is too small, use a ...
DC Series ARC Fault Detection and Extinguishing Method Using Input Capacitor …
The DC optimizer can achieve the maximum power generation for each PV panel. However, it increases possibility of arc fault between PV panel and DC optimizer. Therefore, this paper proposes a detecting method for DC series arc fault between PV panel and optimizer with an input capacitor design. The proposed method utilizes the input current of DC …
Self-detection method for measurement error of capacitor voltage …
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Common capacitors detection methods and experience
1. Detection of fixed capacitors. A. Detecting small capacitors below 10pF Because the fixed capacitor capacity below 10pF is too small, use a multimeter to …
7+ Methods on How to Test a Capacitor With a Multimeter
Testing capacitors with a multimeter is a fundamental skill in electronics maintenance and repair. Capacitors, vital components in electronic circuits, store and release electrical energy. However, like any electronic component, they can degrade over time or become faulty due to various factors such as age, heat, or overvoltage. In this …
CN102749525A
The invention relates to the field of electronics, and discloses a capacitor detection method and a capacitor detection circuit. According to the method, the voltage of a negative input end of an operational amplifier is adjusted to the …
Self-detection method for measurement error of capacitor voltage …
Based on existing self-detection methods, it is necessary to use a signal acquisition device to perform an analog-to-digital conversion on the secondary analog signal of CVTs first.
