scholarly journals Development of Broadband Resistive–Capacitive Parallel–Connection Voltage Divider for Transient Voltage Monitoring

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 451
Author(s):  
Shijun Xie ◽  
Zhou Mu ◽  
Weidong Ding ◽  
Zhenbo Wan ◽  
Shaochun Su ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Low Voltage ◽  
Influence Factors ◽  
Voltage Divider ◽  
Step Response ◽  
Internal Electric Field ◽  
Scale Factors ◽  
Different Temperatures ◽  
Transient Voltages

The on-site measurement of transient voltages is of great significance in analyzing the fault cause of power systems and optimizing the insulation coordination of power equipment. Conventional voltage transformers normally have a narrow bandwidth and are unable to accurately measure various transient voltages in power systems. In this paper, a wideband parallel resistive–capacitive voltage divider is developed, which can be used for online monitoring of transient voltages in a 220 kV power grid. The structures of the high-voltage and low-voltage arms were designed. The internal electric field distribution of the high-voltage arm was analyzed. The influence factors and improvement techniques of the upper frequency limit were studied. The parameters of the elements of the divider were determined. The voltage withstand performances and scale factors under lightning impulses and AC and DC voltages, the temperature stabilities of scale factors and the step response and bandwidth of the developed voltage divider were tested. The results show that the deviations of the scale factors under various voltage waveforms and different temperatures ranging from −20 to 40 °C are within 3%. The withstand voltage meets the relevant requirements specified in IEC60071-1-2011. The step response 10~90% rise time is approximately 29 ns, and the 3 dB bandwidth covers the range of DC to 10 MHz.

Design of a Two Levels Self-Integrating Capacitive Divider

2014 ◽  
Vol 599-601 ◽  
pp. 882-886
Author(s):  
Bao Feng Cao ◽  
Jiang Bing Fan ◽  
Li Jun Song ◽  
Xue Qin Zhang ◽  
Xin Li ◽  
...  
Keyword(s):  
High Voltage ◽  
Voltage Pulse ◽  
Low Voltage ◽  
Voltage Divider ◽  
High Voltage Pulse ◽  
Pulse Source ◽  
Voltage Level ◽  
Capacitive Divider ◽  
Capacitive Voltage ◽  
Capacitive Voltage Divider

A ims . A kind of two levels self-integrating capacitive voltage divider is designed to online measure high voltage nanosecond pulse. Methods. The circuit principle of capacitive divider is analyzed, and the theoretical voltage ratio is calculated. The calibration is carried out by using a low voltage pulse source. The divider with a primary voltage divide ratio 601 has been tested to frequency response exceed 1GHz. The second voltage divide ratio can be set flexibly using different ratio attenuators according to the different voltage level of the source. Result. Finally, this divider is used in measuring 600kV high voltage pulse source, and the experimental results show that the present coaxial capacitive divider is reliable and satisfactory for the measuring requirement in time domain and frequency domain.

The Research of Capacitive Load Influence on Inductive Voltage Divider

2013 ◽  
Vol 718-720 ◽  
pp. 1537-1541
Author(s):  
Yan Qiang Li ◽  
Wen Feng Li ◽  
Hai Ming Shao ◽  
Fei Peng Lin ◽  
Bo Liang ◽  
...  
Keyword(s):  
High Voltage ◽  
Voltage Dependence ◽  
Low Voltage ◽  
Analytical Formula ◽  
Voltage Divider ◽  
Model Analysis ◽  
Circuit Model ◽  
Capacitive Load ◽  
In Series ◽  
Inductive Voltage Divider

The inductive voltage divider is usually used and calibrated at no-load situation, but it also used at taking load situation. For example in the situation of measuring voltage dependence of low voltage capacitors and detecting high voltage bridge, the inductive voltage divider need to take two specific capacitors. This paper have researched the influence of specific capacitive load on its ratio and deduced the analytical formula through related experiments and circuit model analysis when it takes capacitor. And use the method of connecting resistor in series to compensate its ratio accuracy to 1×10-6 degree.

scholarly journals Contribution To The Reduction Of The Ship’s Switchboard By Applying Sensor Technology

2021 ◽  
Vol 93 (6s) ◽  
pp. 235-249
Author(s):  
Nediljko Kaštelan ◽  
◽  
Marko Zubčić ◽  
Maja Krčum ◽  
Miro Petković ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Power Systems ◽  
Power System ◽  
High Voltage ◽  
New Technology ◽  
Voltage Divider ◽  
Rogowski Coil ◽  
Sensor Technology ◽  
Medium Voltage ◽  
Voltage Sensors

The paper discusses the contribution to energy efficiency by reducing the dimensions of the main switchboard (medium voltage or High Voltage – used on ship). Reducing the dimensions of the switchboards can be achieved by reducing the dimensions of the bus bars, while fully satisfying the conditions with regard to thermal and mechanical stresses. The same can be achieved by modifying some other components, such as the application of new technology for measuring current and voltage, using current and voltage sensors that fall into the category of completely new technological solutions. By replacing conventional measuring transformers (IT), compact and efficient sensor technology significantly contributes to reducing the dimensions and mass of switchboards, which ultimately contributes to energy efficiency. Previous applications, the possibility of improving existing solutions, especially in applications in marine power systems, and new technological solutions that contribute to the efficiency of the marine power system using the Rogowski coil sensor and voltage divider voltage sensors are also considered.

Resistive Divider with Mid-Electrode for Nanosecond High-Voltage Pulse Measurement

2013 ◽  
Vol 718-720 ◽  
pp. 1083-1087
Author(s):  
Jing Liang Chen ◽  
Tian Yu Lin ◽  
Dong Qiao Bai ◽  
Xue Ling Yao
Keyword(s):  
High Voltage ◽  
Voltage Pulse ◽  
Low Voltage ◽  
Response Characteristic ◽  
High Voltage Pulse ◽  
Step Response ◽  
Large Power ◽  
Pulse Measurement ◽  
Resistive Divider ◽  
The One

Resistive dividers have been widely applied in the field of high voltage pulse measurement because of its simple structure, fast response, large power and low distortion rate [1], but measurement inaccuracy is usually coming when the rise time of pulses is less than 10ns. In the article the effects on the response characteristic are investigated theoretically and experimentally and it puts forward a solution that a mid-electrode is joined to transform the distributed capacitance into the one from high voltage side to mid-electrode and the one from mid-electrode to earth in series connection. A new resistive divider with mid-electrode is designed with high voltage side of 10.2kΩ, low voltage side of 10.01Ω and ratio of 1061.86. It is revealed that the divider has excellent response characteristic with the step response time of less than 1.6ns and the measurement uncertainty of less than 1%.

scholarly journals Wide Load Range ZVS Three-level DC-DC Converter: Modular Structure, Redundancy Ability, and Reduced Filters Size

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3537 ◽  
Author(s):  
Yong Shi ◽  
Zhuoyi Xu
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
High Performance ◽  
Low Voltage ◽  
Modular Architecture ◽  
Load Range ◽  
Zero Voltage Switching ◽  
Conduction Loss ◽  
Zero Current Switching ◽  
Zero Current

In future dc distributed power systems, high performance high voltage dc-dc converters with redundancy ability are welcome. However, most existing high voltage dc-dc converters do not have redundancy ability. To solve this problem, a wide load range zero-voltage switching (ZVS) three-level (TL) dc-dc converter is proposed, which has some definitely good features. The primary switches have reduced voltage stress, which is only Vin/2. Moreover, no extra clamping component is needed, which results simple primary structure. Redundancy ability can be obtained by both primary and secondary sides, which means high system reliability. With proper designing of magnetizing inductance, all primary switches can obtain ZVS down to 0 output current, and in addition, the added conduction loss can be neglected. TL voltage waveform before the output inductor is obtained, which leads small volume of the output filter. Four secondary MOSFETs can be switched in zero-current switching (ZCS) condition over wide load range. Finally, both the primary and secondary power stages are modular architecture, which permits realizing any given system specifications by low voltage, standardized power modules. The operation principle, soft switching characteristics are presented in this paper, and the experimental results from a 1 kW prototype are also provided to validate the proposed converter.

scholarly journals Bidirectional Interleaved PWM Converter with High Voltage-Conversion Ratio and Automatic Current Balancing Capability for Single-Cell Battery Power System in Small Scientific Satellites

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2702 ◽  
Author(s):  
Masatoshi Uno ◽  
Masahiko Inoue ◽  
Yusuke Sato ◽  
Hikaru Nagata
Keyword(s):  
Power Systems ◽  
Single Cell ◽  
High Voltage ◽  
Pulse Width Modulation ◽  
Low Voltage ◽  
Conversion Ratio ◽  
Pwm Converter ◽  
Bidirectional Converters ◽  
Battery Power ◽  
Voltage Conversion

Single-cell battery power systems are a promising bus architecture for small scientific satellites. However, to bridge the huge voltage gap between a single-cell battery and power bus, bidirectional converters with a high voltage conversion ratio and a large current capability for the low-voltage side are necessary. This article proposes a bidirectional interleaved pulse width modulation (PWM) converter with a high voltage conversion ratio and an automatic current balancing capability. By adding capacitors to conventional interleaved PWM converters, not only are inductor currents automatically balanced without feedback control or current sensors, but also voltage conversion ratios at a given duty cycle can be enhanced. Furthermore, the added capacitors can reduce voltage stresses of switches and charged-discharged energies of inductors, realizing more efficient power conversion and reduced circuit volume in comparison with conventional converters. A 100-W prototype was built for experimental verification, and results demonstrated the fundamental characteristics and efficacy of the proposed converter.

An Auxiliary Power Supply for Gate Drive of Medium Voltage SiC Devices in High Voltage Applications

2018 ◽  
Vol 924 ◽  
pp. 836-840
Author(s):  
Bo Xue Hu ◽  
He Li ◽  
Zhuo Wei ◽  
Ya Feng Wang ◽  
Diang Xing ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
High Reliability ◽  
Voltage Divider ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Multilevel Converters ◽  
Medium Voltage ◽  
Auxiliary Power

A high-reliability auxiliary power supply (APS) for gate drive circuits is crucial to utilization of emerging medium voltage (MV ≥ 10 kV) Silicon Carbide (SiC) devices in high voltage applications. This paper proposes an active voltage divider based APS with lower arm voltage regulation. The proposed APS circuit is targeting the application of MV SiC devices in modular multilevel converters (MMCs). It can harvest energy from a MV (≥ 7 kV) dc bus to provide an isolated low voltage output to gate drive circuits of MV SiC devices. Compared to existing APS solutions, it can achieve a high input voltage (≥ 7 kV) with simple circuit structure and control scheme. In this paper, the working principle of the proposed APS is presented and a circuit design example is shown. A circuit prototype with 7 kV input and 15 V/10 W output has been built and tested to verify the effectiveness of the proposed solution.

scholarly journals Analysis of winding temperature field under dynamic variable load of oil-immersed transformer

2021 ◽  
Vol 25 (4 Part B) ◽  
pp. 3009-3019
Author(s):  
Dapeng Xu ◽  
Yu Mao ◽  
Xiaohui Yang ◽  
Chunxu Qin ◽  
Haikun Shang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Power Systems ◽  
High Voltage ◽  
Low Voltage ◽  
Hot Spot ◽  
Variable Load ◽  
Insulation Material ◽  
Dynamic Variable ◽  
Calculation Results ◽  
Transformer Winding

The research on the temperature field of the transformer winding under dynamic variable load is of great significance for ensuring the safe operation of power systems. This paper takes an SSP-360000/500 transformer as the research object, establishes a 2-D simulation model, and uses the finite volume method to analyze the high voltage winding and low voltage winding temperature distribution of the transformer under dynamic variable load. The simulation calculation results have been fully verified by the experimental data to make the successful prediction of the overall temperature and hot spot temperature position of forced oil circulation transformers with a guided structure. The results show that the most significant temperature raise occurs at the secondary end of the winding. In the case of dynamic variable load. The temperature raise of the winding becomes larger as the load increases, but before the rated load is in the stable temperature rise range, it can run safely for a long time. However, during overload operation, the average temperature raise of the high voltage winding may exceed its limit, the insulation material is damaged.

scholarly journals Towards a traceable divider for composite voltage waveforms below 1 kV

2021 ◽  
Author(s):  
F. Galliana ◽  
S. E. Caria ◽  
P. E. Roccato
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
Scale Factor ◽  
National Standards ◽  
Step Response ◽  
Test Set ◽  
Impulse Generator ◽  
Electrical Devices ◽  
Set Up ◽  
Wave Shapes

AbstractIn the framework of the European Project 19NRM07 HV-com2 supporting the standardization in high-voltage testing with composite and combined wave shapes, a divider to employ in a test set-up for validation of electrical devices submitted to composite voltages below 1 kV has been developed at the Istituto Nazionale di Ricerca Metrologica (INRIM) and currently is under extensive testing. After a simulation stage, an available divider has been modified to comply with the IEC 60,060 requirements in terms of step response and scale factor. To be suitably fast in replying to step voltages, an adjustment of the components of the low-voltage arm has been made. The divider has been calibrated with traceability to the relevant INRIM National Standards and characterized exploiting its scale factor at different voltages and frequencies. The divider has been then inserted in a set-up with a sinusoidal generator, an impulse generator and coupling–blocking elements to carry out tests at low voltages (below 1 kV) with single voltages. In these tests, the divider showed a satisfactory attitude as converting device and its scale factor is traceable with suitable uncertainty.

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