Development of a single capacitor-voltage-divider flux-loop for field-reversed theta-pinch plasmas

2021 ◽  
Vol 92 (10) ◽  
pp. 103504
Author(s):  
Zhipeng Chen ◽  
Hui Ye ◽  
Yangming Zhao ◽  
Huapu Deng ◽  
WenShan Wang ◽  
...  
Keyword(s):  
Voltage Divider ◽  
Theta Pinch ◽  
Capacitor Voltage

Research on the Voltage Balance Strategy of Modular Multilevel Converter

2014 ◽  
Vol 1055 ◽  
pp. 157-160
Author(s):  
Ji Min Jing ◽  
Jing Ze Wang ◽  
Yan Chao Ji
Keyword(s):  
Control Strategies ◽  
Low Frequency ◽  
Voltage Divider ◽  
Voltage Source ◽  
Stable Operation ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Factors Affecting ◽  
Capacitor Voltage ◽  
Voltage Balance

The modular multilevel converter (MMC) does not need clamping devices and multiple independent DC voltage source and has a modular structure which is easy to be extended to any level, share a DC side, easy to direct back to back four-quadrant operation and attracts widespread attention. Due to the use of sub-module MMC suspended on the DC side capacitor voltage divider provides synthetic AC output voltage required voltage level and therefore it is essential to the stable operation of the sub-module capacitor voltage balance of the MMC. In this paper, the factors affecting the MMC sub-module capacitor voltage balancing has been carried out a detailed analysis and this paper focuses on the nominal frequency erupted module capacitor voltage control strategies and the average low frequency sub-module capacitor voltage ripple suppression strategies.

High accuracy optical voltage transformer with digital output based on coaxial capacitor voltage divider

2017 ◽  
Vol 40 (13) ◽  
pp. 3824-3833
Author(s):  
Zhen-hua Li ◽  
Shuang Zhao
Keyword(s):  
Measurement Accuracy ◽  
Voltage Divider ◽  
Measurement Precision ◽  
Self Healing ◽  
Light Path ◽  
Stray Capacitance ◽  
Voltage Transformer ◽  
Digital Output ◽  
Capacitor Voltage ◽  
Capacitor Divider

The voltage transformer based on capacitor divider is susceptible to stray capacitance and Bi4Ge3O12 crystal is sensitive to temperature, which leads to the decrease of measurement precision. To solve these questions, a kind of temperature self-healing optical voltage transformer based on the coaxial capacitor is proposed in this paper. By using coaxial capacitor divider structure instead of the traditional capacitor divider structure, and using a reference light path to achieve the function of temperature self-healing, the measurement accuracy of the optical voltage transformer can be improved. The theoretical analysis, modeling and simulation of several key technologies of coaxial capacitance are presented. Simulation and experimental results show that the temperature self-healing optical voltage transformer based on coaxial capacitor structure meets the requirements of the 0.2 class accuracies.

scholarly journals A novel broadband capacitor voltage divider for measurement of ultrafast square high voltage pulse transmitted in transmission line

AIP Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 045035
Author(s):  
Bing Wei ◽  
Hongwei Liu ◽  
Jinhui Liang ◽  
Jianqiang Yuan ◽  
Weiping Xie
Keyword(s):  
Transmission Line ◽  
High Voltage ◽  
Voltage Pulse ◽  
Voltage Divider ◽  
High Voltage Pulse ◽  
Capacitor Voltage

Research on the Calibration Instrument for the Medium-Voltage Electronic Instrument Transformers

2012 ◽  
Vol 433-440 ◽  
pp. 7471-7478
Author(s):  
Yue Xie ◽  
Jing Chen
Keyword(s):  
Measurement Method ◽  
Voltage Divider ◽  
Electrical Measurement ◽  
Electronic Instrument ◽  
Medium Voltage ◽  
Air Core ◽  
Difference Measurement ◽  
Capacitor Voltage ◽  
Instrument Transformers ◽  
The Difference

Electronic instrument transformers are used in power line for electrical measurement and protection purposes. Calibration instruments are necessary for the transformation error test of electronic instrument transformers. The operation principles of the direct and difference measurement method based calibration instrument for the medium-voltage electronic instrument transformers are systematically analyzed in this paper. The analysis results show that the direct measurement method based instrument can be used for the calibration of electronic instrument transformers with air-core coils or resistor-capacitor voltage divider without a built-in integrator, and the difference measurement method based instrument is suitable for the calibration of the electronic instrument transformers with no rated phase offset.

100 KV Scanning Microscope

1972 ◽  
Vol 30 ◽  
pp. 472-473 ◽  
Author(s):  
A. V. Crewe ◽  
M. W. Retsky
Keyword(s):  
High Voltage ◽  
Voltage Divider ◽  
Electron Gun ◽  
Objective Lens ◽  
Parallel Beam ◽  
Emission Point ◽  
Error Amplifier ◽  
External Reference ◽  
Scanning Transmission ◽  
Transmission Microscope

A 100 kv scanning transmission microscope has been built. Briefly, the design is as follows: The electron gun consists of a field emission point and a 3 cm Butler gun. The beam has a crossover outside the gun and is collimated by a condenser lens.The parallel beam passes through a defining aperture and is focused by the objective lens onto the specimen. The elastic electrons are detected by two annular detectors, each subtending a different angle, and the unscattered and inelastic electrons are collected by a third detector. The spectrometer that will separate the inelastic and unscattered electrons has not yet been built.The lens current supplies are stable to within one part per million per hour and have been described elsewhere.The high voltage is also stable to 1 ppm/hr. It consists of the raw supply from a 100 kv Spellman power supply controlled by an external reference voltage, high voltage divider, and error amplifier.

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