The influence of pulsed discharge times on the characteristic of self-healing is studied through online self-healing detection method. The results show that peak frequency of ultrasonic signal is between 50 kHz and 60 kHz. As the number of pulsed discharge time increases, low voltage self-healing discharges become more frequent and the self
Customer ServiceIn Fig. 1, T 1 is the voltage regulator, the rated voltage is 380 V/400 V, the capacity is 100 kVA; T 2 is the step-up transformer, the rated voltage is 400 V/15 kV, the capacity is 100 kVA; L is the compensating reactor; C 1 is the regulator capacitor, simulating the total capacitance of the capacitors in series with the faulty capacitor unit in the actual capacitor
Customer ServiceIn this paper, an experimental platform for the self-healing breakdown of metallized polypropylene films under AC voltage is built, and the effects of voltage,
Customer ServiceIn this paper, an experimental platform for the self-healing breakdown of metallized polypropylene films under AC voltage is built, and the effects of voltage, temperature, shunt capacity, film thickness and interlayer pressure on the self-healing characteristics of metallized film capacitors are investigated, and the results will
Customer ServiceWhere 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 charge resistance is 10 MΩ, the current limiting resistance is 100 Ω, the sampling resistance is 1 Ω, u c0 (t), i c0 (t) are the voltage and current in the self-healing circuit during self-healing process, i d
Customer ServiceSelf-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 aging factor of MFC due to the demetallization, leading to the reduction of capacitor plate and resulting in the MFC capacitance loss. The state of MFC should be monitored
Customer ServiceOn this platform, the ultrasonic method and ultra high frequency (UHF) method were investigated so as to detect the self-healing discharge signals of operating MFCs. The differences of ultrasonic signals and UHF signals were compared between DC voltage and DC superimposed AC voltage, and the feasibility of MFC monitoring methods based on the
Customer ServiceMetallized film capacitors (MFCs) are known for their self-healing (SH) properties, enabling efficient and reliable operation, even under challenging conditions. These SH events have the potential to inflict damage on both the polypropylene (PP) film and the electrode layer.
Customer ServiceIn this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star
Customer ServiceThe breakdown voltage evaluate the effect of the type of cathode materials on was determined as maximum on the V-t curves. scintillation breakdowns and self-healing capability of the Due to self-healing, the voltage across the part that drops parts. The latter was assessed by the proportion of capacitors during the scintillation event starts
Customer ServiceMetalized film capacitors (MFC) are widely applied in power system, military weapons and railway traffics, etc. The lifetime of MFC is closely related to the self-healing (SH) process, which causes the loss of electrode area and thus leads to the capacitance reduction.
Customer ServiceOn this platform, the ultrasonic method and ultra high frequency (UHF) method were investigated so as to detect the self-healing discharge signals of operating MFCs. The differences of
Customer ServiceIn this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star and delta
Customer ServiceSelf-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
Customer Servicehigh-voltage self-healing capacitors eISSN 2051-3305 Received on 29th August 2018 Revised 16th November 2018 Accepted on 16th November 2018 E-First on 9th January 2019 doi: 10.1049/joe.2018.8775 Yan Fei1,2, Wang Zijian3, Yin Ting1,2 1Department of High Voltage, China Electric Power Research Institute, Beijing 100192, People''s Republic of China
Customer ServiceTherefore, in order to reduce the self-healing energy and achieve good self-healing, metallization of organic films with low melting point metals is performed addition, the metallization layer should not be unevenly thick and thin, especially to avoid scratches, otherwise, the insulation isolation area will become branch-like and fail to achieve good self-healing. CRE capacitors all
Customer ServiceMetallized film capacitors (MFCs) are known for their self-healing (SH) properties, enabling efficient and reliable operation, even under challenging conditions. These SH events have the
Customer ServiceIn this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star and delta MFCs, the...
Customer ServiceNWC1 series self-healing low voltage shunt capacitors (hereinafter referred to as capacitors) are applicable to power frequency AC power systems with rated voltage up to 1,000V for power factor increase, reactive power loss reduction and voltage quality improvement. 2 T yp eK a nd D f it o s N WC 1 L refers to inductance Phase number: 3-three phase, 1-single phase Rated capacity
Customer ServiceIn this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star and delta MFCs, the...
Customer ServiceIn this paper, we focused on the ultrasonic detection technique to reveal the self-healing characteristics of two typical MFCs. By launching a series of HV tests with star and delta MFCs, the waveform features, discharge energy, and spectrum distributions were analyzed.
Customer ServiceThe invention discloses a detection method of self-healing breakdown of a capacitor. The method comprises the following steps of: (1) connecting a detection capacitor
Customer ServiceThe invention discloses a detection method of self-healing breakdown of a capacitor. The method comprises the following steps of: (1) connecting a detection capacitor with a detection...
Customer ServiceNWC5/NWC6 series self-healing low voltage shunt capacitors (hereinafter referred to as capacitors) are applicable to power frequency AC power systems with rated voltage up to 1,000V for power factor increase, reactive power loss reduction and voltage quality improvement. Phase number: 3-three phase, 1-single phase,3T-three phase insert type Rated capacity (kvar) Rated
Customer ServiceMetalized film capacitors (MFC) are widely applied in power system, military weapons and railway traffics, etc. The lifetime of MFC is closely related to the self-healing
Customer Serviceelectronics Article Detection of Self-Healing Discharge in Metallized Film Capacitors Using an Ultrasonic Method Yusheng Ma 1, Haitao Shen 2, Chunming Pei 3, Huanyu Zhang 1, Muhammad Junaid 4 and Yuxing Wang 1,* 1 Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, China; yushengma@zju .cn (Y.M.);
Customer ServiceSelf-healing low-voltage shunt capacitors are suitable for low-voltage power systems with a frequency of 50 days or 60 days. They are mainly used to improve power factor, reduce reactive power loss, improve voltage quality, and tap transformer capacity. It is the best energy-saving product strongly recommended by the country. This product complies with: National Standard
Customer ServiceBased on the experimental observations, a detection algorithm incorporated with the ultrasonic emission sensors, preamplifier, and high-speed A/D converter was developed to assist the self-healing performance test. 1. Introduction Metallized film capacitors (MFCs) are widely used in reactive power compensation and the improvement of power factors.
From the typical waveform, it can be seen that during the self-healing process, the voltage across the specimen remains basically constant due to the presence of the shunt capacitor, and the duration of the self-healing current is about 1–2 μs. Based on the experimental waveform and Eq. (1), the self-healing energy E sh can be calculated.
The self-healing characteristics of metallized film capacitors under DC voltage have been studied extensively by scholars.
However, not all types of SH damage lead to catastrophic failure of the capacitor. Thus, finding the threshold of SH that has little impact on the reliability of the capacitor is important. This article classifies SH events based on their SH energy, ranging from safe to risky, and establishes thresholds for safe SH.
The elements were aged under DC voltages of 1.4 UN, 1.5 UN, 1.6 UN and 1.7 UN, abbreviated as C1, C2, C3 and C4 respectively, where the UN was the rated voltage of DC-link capacitors that was 2900 V in the present study. During the ageing, the capacitance of each sample element was measured at every 24 h.
According to the general instruction of IEC [ 17 ], and based on the time-frequency features observed in this work, a self-healing detection software package was developed. The process of the main program of the detection software is shown in Figure 16.
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