Detection method of coupling capacitor

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This detection method can simultaneously accurately identify series arc, as well as the load type. ... capacitive, switching loads, but no inductive loads. Resistive, reactive load, but no switching loads. ... 2020. "Series AC Arc Fault Detection Method Based on High-Frequency Coupling Sensor and Convolution Neural Network" Sensors 20, no. 17: ...

Series AC Arc Fault Detection Method Based on High-Frequency Coupling ...

This detection method can simultaneously accurately identify series arc, as well as the load type. ... capacitive, switching loads, but no inductive loads. Resistive, reactive load, but no switching loads. ... 2020. "Series AC Arc Fault Detection Method Based on High-Frequency Coupling Sensor and Convolution Neural Network" Sensors 20, no. 17: ...

Simulation and Experimental Study on Doubled-Input …

In Fig. 2A, resistor R1 is the resistance in the capillary tube between two electrodes, capacitors C1 is the coupling capacitor, and C2 is the stray capacitor. The detection circuit included an I ...

[PDF] Comparison of on-line partial discharge detection methods …

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 comprehensive investigation and …

Single-electron detection utilizing coupled nonlinear microresonators

The basic mechanism of high-resolution charge detection. In open-loop measurement, we obtain the amplitude-frequency responses of R1 for varying coupling voltage V C.The corresponding peak ...

An online detection method for capacitor voltage transformer with ...

A capacitive voltage transformer (CVT) is one of the electrical quantities measurement devices, and the state of its internal insulation is the key factor for ensuring the accuracy of its ...

Partial discharge detection in cables using VHF capacitive couplers

In order to detect and locate partial discharge (PD) activity within HV cables and in particular cable joints, the feasibility of using a very high frequency WHO capacitive coupler technique has been investigated. In addition, an alternative PD offline test method for cable joints or cable sections within long cable systems has been developed. By energising the joint or a …

TSV fault detection with large non-contact probes using capacitive ...

A non-contact TSV fault detection method is proposed using capacitive coupled probing. The proposed method detects TSV faults by eye-pattern diagrams of extracted EM-modeled transfer characteristics. The TSV and a capacitive coupling is modeled using full wave analysis. Because the measurement is conducted by moving one top probe without contact …

Coupling and Leakage in RF Systems | Real-Life RF Signals

RF signals readily travel through unintended conduction paths created by capacitive coupling, radiated coupling, and inductive coupling. The movement of RF signals through unintended conduction paths is referred to as leakage. RF systems can be divided into three general categories: full duplex (simultaneous two-way communication)

A new method of capacitively coupled contactless conductivity detection ...

Efforts have been made to propose methods to overcome the adverse influences of the coupling capacitances of CCD, such as the parallel resonance method [20], the series resonance method [21], the ...

A comprehensive review of loosening detection methods for threaded ...

Cai et al. [95] modified the traditional time reversal method and proposed the virtual time reversal (VTR) method for loosening detection. In the VTR method, the time reversal is performed only one time for the response signal in the healthy state. The process of bolt loosening detection by VTR method is shown in Fig. 11. An input pulse signal ...

Input and Output Coupling | Bipolar Junction Transistors

Another method to isolate the speaker from DC bias in the output signal is to alter the circuit a bit and use a coupling capacitor in a manner similar to coupling the input signal (Figure below) to the amplifier. Capacitor coupling isolates DC from the load.

The Basics of Partial Discharge Testing

The most common circuit for measuring PD is the top left in the above image, in which the measuring impedance Z m is in series with the coupling capacitor C k, both of which are in parallel to the DUT tection sensitivity can be increased if the measuring impedance is placed in series with the ground of the DUT (top right).

Fast bus voltage detection method for single-phase power …

Under dynamic conditions, the response time of traditional voltage detection methods is relatively lengthy, leading to overshoots in the DC-link voltage of single-phase power converters, which significantly degrades system performance. This study proposes a rapid voltage transient detection method based on reduced-order generalized integrator (ROGI) aimed at …

Device for online monitoring of insulation faults in high …

method The pulse current method is an effective method for PD detection. This method involves a measuring capa-citor, a coupling capacitor, and an impedance detector to measure the PD. When PD occurs in the measured capacitor, the voltage at both ends of the capacitor drops instantaneously. At this time, the voltage at the

Use of capacitive couplers for partial discharge measurements in …

The capacitive coupler is an attractive tool for on‐site partial discharge (PD) detection in a cable joint. To study its sensitivity characteristic, PDs in a 110‐kV prefabricated …

US8681540B2

Embodiments of the present disclosure describe methods, apparatus, and system configurations for tile-level snapback detection through a coupling capacitor in a phase-change memory array. Other embodiments may be described and claimed.

Study of Capacitive Coupling Sensor Fused With High …

1 State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute Co., Ltd., Wuhan, China; 2 Cable Branch of State Grid Beijing Electric Power Co., Ltd., Beijing, China; 3 College of …

Introduction to Partial Discharge (Causes, Effects, and …

RFCT (Radio Frequency Current Transformer) is a non-invasive method to detect partial discharge in cables and other insulated equipment. Learn about the causes, effects, and …

Basics of Partial Discharge Measurement | SpringerLink

Learn about the basics of measuring partial discharges, a small, localized electrical discharge in insulation, using electromagnetic, acoustic and optical methods. The …

What is a Coupling Capacitor?

A coupling capacitor is a capacitor which is used to couple or link together only the AC signal from one circuit element to another. The capacitor blocks the DC signal from entering the second element and, thus, only passes the AC signal. ... So this is an effective method for choosing the value of a coupling capacitor. It allows for low ...

Partial Discharge Detection in Solid Dielectrics

The coupling capacitor bypasses the power frequency components and allows only the PD pulses to reach the measuring impedance. 3.2.2 Balanced Detection Method Figure 4 shows a bridge …

Research on Self-Healing Discharge Detection Method of …

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-healing processes, which threatens the safety and reliability of the power system. In this study, a test platform was built for applying DC voltage as well as DC superimposed AC voltage to …

Capacitive Coupling Detection and Characteristic Analysis of …

Five models of typical internal insulation defects are designed and a test platform for partial discharge(PD) research on cable accessories also is constructed in order to study PD characteristics of internal insulation defects in 110 kV XLPE cable joints use of capacitive coupling method,plenty of PD data are obtained for various models and the construction of …

Detection method of self-healing breakdown of capacitor

3. the detection method that capacitor generation self-healing property according to claim 1 punctures; It is characterized in that; With after detecting signal that inductor produces and getting into amplification and rectification circuit through isolation coupling, become the pulse signal of Transistor-Transistor Logic level, get into the ...

A Review of Online Partial Discharge Measurement of …

To avoid the attenuation resulting from the neutral grounding transformer and consequently increase the detection sensitivity, Harrold et al. proposed to replace RFCT with a coupling capacitor, which is in parallel with …

Technical paper A Guide for Partial Discharge …

Learn about partial discharge (PD) phenomena, theory, detection methods and coupling techniques for medium voltage (MV) and high voltage (HV) equipment. This technical paper is …

Coupling Capacitor

The capacitive methods of coupling E-field applicators are shown in Figure 3.18A and B. In the first one, a variable capacitor is used in series with the parallel resonant circuit. A second variable capacitor is added in Figure 3.18B, which provides both tuning and matching capability.

Self-detection method for measurement error of capacitor voltage ...

This paper investigates a 110 kV on-site calibration system for EVTs, including a standard channel, a calibrated channel and a PC equipped with the LabView environment, and an adaptive full-phase discrete Fourier transform (DFT) algorithm is proposed to …

Partial Discharge Measurement and Analysis | SpringerLink

The capacitive coupling generally depends on the dimensions of the sensor, distance to the test object, and the electric field intensity of the emitted waves. ... Tian Y, Lewin PL, Davies AE (2002) Comparison of on-line partial discharge detection methods for HV cable joints. IEEE Trans Dielectr Electr Insul 9:604–615. Article Google Scholar

Introduction to Partial Discharge (Causes, Effects, and …

Practical Online PD Detection Methods Cable Discharge Activity • RFCT Detection of Current Pulse • RF Detection of EMI –near terminations ... Coupling Capacitor Measuring Instrument Measuring Impedance Source Impedance. Offline PD Testing HF Current flow due to defect flashover Cable under test Cable Shield Defect

Influence of Coupling Capacitor Voltage Transformers on …

different transient detection methods available in the literature were used to implement the analyzed fault location method. The obtained results indicate that the estimated fault locations are directly affected by the CCVT frequency response. Keywords: CCVT, travelling waves, fault …

Three detection methods of capacitors

It is widely used in the circuit of DC, AC, coupling, bypass, filtering, tuning loop, energy conversion, control, etc. The detection of capacitors is mainly divided into three categories: the detection of fixed capacitors, the detection of electrolytic capacitors, and the detection of variable capacitors. First. Detection of fixed capacitors 1 ...

Study of Capacitive Coupling Sensor Fused With High Voltage …

1 State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute Co., Ltd., Wuhan, China; 2 Cable Branch of State Grid Beijing Electric Power Co., Ltd., Beijing, China; 3 College of Electrical Engineering and New Energy, Three Gorges University, Yichang, China; A capacitive coupling sensor for partial discharge detection …

Detection of the ratio error drift in CVT considering AVC

The ICA-based detection method as well as the procedures are presented in Section 4. Section 5 demonstrates the method validity through simulations on field data. ... Design and evaluation of a compensating algorithm for the secondary voltage of a coupling capacitor voltage transformer in the time domain. IET Gener. Transm. Distrib. (2009)

Simulation and Experimental Study on Doubled-Input ...

In Fig. 2A, resistor R1 is the resistance in the capillary tube between two electrodes, capacitors C1 is the coupling capacitor, and C2 is the stray capacitor. The detection circuit included an I ...

Research on adaptive state prediction method for the metering …

Coupling capacitor voltage transformer: A model for electromagnetic transient studies," Electr. Power Syst. Res. 77 ... A new hybrid fault detection method for wind turbine blades using recursive PCA and wavelet-based PDF," IEEE Sens. J. 20 (4),

Capacitive sensing

In electrical engineering, capacitive sensing (sometimes capacitance sensing) is a technology, based on capacitive coupling, that can detect and measure anything that is conductive or has a dielectric constant different from air. Many types of sensors use capacitive sensing, including sensors to detect and measure proximity, pressure, position and displacement, force, humidity, …

(PDF) Study of Capacitive Coupling Sensor Fused With

A capacitive coupling sensor for partial discharge detection with the fusion of high voltage XLPE cable joint is designed in this paper. The sensor is to address partial discharge signals leading ...

The Basics of Partial Discharge Testing

Learn about partial discharge (PD), a localized electrical discharge that can degrade insulation systems and cause electrical breakdowns. Find out how to measure PD using different circuits and parameters, and what PD sources are …

Development of a Novel Capacitive Partial Discharge Coupling …

The partial discharge detection is a proposed method to assess the insulation condition of the power cable. Conventionally used partial discharge couplers with narrow bandwidth can not meet the high sensitivity requirements of long cable testing. This paper presented a novel partial discharge coupler based on the RLC capacitive coupler. The designed coupler meets the …

Partial discharge detection in cables using VHF capacitive couplers

Abstract: In order to detect and locate partial discharge (PD) activity within HV cables and in particular cable joints, the feasibility of using a very high frequency WHO …

Partial Discharge Measurement Coupling Methods

Learn about different coupling methods for PD measurements according to IEC 60270 standard, such as capacitors, HFCTs, bushing taps and UHF. Compare the advantages and …

Use of capacitive couplers for partial discharge measurements in …

The inner capacitive coupling partial discharge sensor for cable joints is of high sensitivity and wide detecting bandwidth, ... This paper presents a new on-line Partial Discharge Detection Method of cable with the capacitor sensors. The propagation rule of PD signal in the cable joint of the cross-bonding link-system was … Expand. 6.

Capacitive Coupling

Laboratory measurements have shown that the capacitive coupling method is an effective means of coupling the RF output signal. If coupling capacitors with tight tolerances are used, the coupling factor will be consistent. On the other hand, a directional coupler''s coupling factor can vary up to 1.5dB. The total number of components decreases ...

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