At this point, the polymer absorbed oxygen and generated insulating materials, which isolated the defective portion from the remainder of the capacitor. Despite the loss of some effective capacitance, the self-healing process had a negligible impact on the overall performance, while substantially reducing the LC [40, 41].
Capacitors made of metallized polypropylene films suffer partial discharges, called self-healing, due to weak electrical defects. Those defects are destroyed by an electrical arc that extinguishes when enough metal of the electrodes is vapourized around this point.
Moreover, the Dissipation Factor (DF) of the capacitor was also enhanced. The utilization of a conductive polymer as the cathode layer provided the capacitors with self-healing characteristics that significantly decreased the leakage current (LC) in the capacitor.
Self-healing is the spontaneous extinction of a local electrical arc due to the destruction of the electrodes during the process. It occurs in capacitors made of metallized films of plastics with a thin layer of metal (the layer thickness e is ∼10 nm). This phenomenon was first studied by Heywang and Kammermaier , . They showed that
In 1956, H.E. Haring and R.L. Taylor from Bell Labs designed the first generation of solid tantalum electrolytic capacitors, which utilized tantalum pentoxide (Ta 2 O 5) as the dielectric layer, manganese dioxide (MnO 2) as the cathode material, and graphite silver paste as the auxiliary cathode layer .
The effect of electroplating conditions on the electrical properties of the tantalum electrolytic capacitors (TECs) was comprehensively studied. The results demonstrated that incorporating a copper metal layer into the structure of the capacitors significantly reduced the ESR of TECs.
Benefiting from self-healing features, metallized film capacitors (MFCs) are widely employed to compensate reactive power (VAR) and thus improve the performance of AC systems. To …
An e ective method of self-healing detection based on ultrasound has been suggested [17]. However, no quantitative data of this method have been reported. ... A typical MFC consists of …
This study aims to develop a novel self-healing polymer tantalum electrolytic capacitor with low equivalent series resistance (ESR), high-frequency performance, and a …
The self-healing electrolytes play an essential role in self-healing supercapacitors. Herein, poly (vinyl alcohol)/sulphuric acid (PVA/H2SO4) hydrogel electrolytes with self-healing properties …
It is urgent to study new scheme to protect the self-healing failure of high-voltage capacitors. Simulations tests and experiments were conducted to further assess self-healing of...
Metal-film dielectric capacitors provide lump portions of energy on demand. While the capacities of various capacitor designs are comparable in magnitude, their stabilities …
Self-healing (SH) is a unique feature of metallized film capacitors (MFCs), improving the reliability of MFCs by clearing internal defects. On the other hand, SH is also an …
Self-healing (SH) is a unique feature of metallized film capacitors (MFCs), improving the reliability of MFCs by clearing internal defects. On the other hand, SH is also an …
In the context of the dielectric breakdown, self-healing designates a range of chemical processes, which spontaneously rearrange the atoms in the soot channels to …
A theory of self-healing (SH) in metallized film capacitors (MFCs) is introduced. The interruption of the filamentary breakdown (BD) current in the thin dielectric insulation …
We have developed a universal method for predicting the composition and evaluating the properties of the decomposition products obtained after the dielectric …
It is urgent to study new scheme to protect the self-healing failure of high-voltage capacitors. Simulations tests and experiments were conducted to further assess self-healing of...
Therefore, a method of capacitor self-healing failure protection based on active power variation was proposed. 1Introduction The high-voltage self-healing capacitor adopts the metallised …
Metallized film capacitors (MFCs) are widely used in the power electronics industry due to their unique self-healing (SH) capability. SH performance is an essential …
In modular multilevel converters (MMCs) of HVDC system, the metallized film capacitors (MFCs) suffer from complex electrical stresses. The aging of MFC is related to the accumulation of self …
Capacitors made of metallized polypropylene films suffer partial discharges, called self-healing, due to weak electrical defects. Those defects are destroyed by an electrical …
This article uses a step-by-step test method, which greatly increases the probability of self-healing failure of capacitor components and allows self-healing failure to …
Where C s is the metallised film sample to be tested (around 10–20 nF), isolating capacitor is 1 μF, the inductance is 10 H, the stabilising capacitor is 0.1 μF, the …
There are no reliable measures for identifying self-healing failures in capacitors. Therefore, the high-voltage self-healing capacitor have not been widely adopted in power …
This article uses a step-by-step test method, which greatly increases the probability of self-healing failure of capacitor components and allows self-healing failure to develop under actual operating conditions.