Coaxial Capacitive Dividers for High-Voltage Pulse Measurements in Intense Electron Beam Accelerator With Water Pulse-Forming Line

Liu, Jinliang; Ye, Bing; Zhan, Tian-wen; Feng, Jing; Zhang, Jiande; Wang, Xinxin

doi:10.1109/tim.2008.927195

Cited by 32 publications

(10 citation statements)

References 12 publications

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“…The capacitive divider used in the test experiment has a bad pulse response because the parasitic inductance of the discrete capacitor causes high-frequency oscillations [5]. However, the oscillations will be eliminated if capacitive dividers with distributing structures [1][2][3][4][5] are used in practical measurement.…”

Section: Experimental Verificationmentioning

confidence: 99%

“…A capacitive voltage divider is widely used in the measurement of fast voltage pulses due to its fast response, wide bandwidth, large voltage division ratio and stability [1][2][3][4][5][6][7][8]. Moreover, its measurement circuit is simpler than new measurement methods such as measurement using the electro-optical effect [9], which makes it preferable for the measurement of highvoltage (HV) pulses.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the match problem of a capacitive voltage divider with a long measurement cable

et al. 2017

Meas. Sci. Technol.

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Research is carried out on the basis of the traditional two-end matched circuit of a capacitive voltage divider with a long measurement cable. Transmission progress in the circuit is analyzed theoretically. A match condition of the circuit is acquired, which requires that the circuit satisfies two conditions: (1) the measurement error should be small for a pulse with a duration of less than twice the delay time of the measurement cable; (2) the initial division ratio and the stable division ratio of the circuit are the same. Two matched methods of the circuit are acquired, including the first-order matched method and the second-order matched method. Numerical simulations are carried out. According to the simulation results, the relative errors of the circuits with a cable of 20 m are less than 1.5%, obtained by using both match methods for measurement of rectangular pulses with rise and fall times of 5 ns. An improved circuit is presented, which is suitable for any situation where the low-voltage capacitance of the capacitive divider is even smaller than the capaictance of the measurement cable. A verification experment is carried out, and the test result confirms the simulation result.

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Section: Experimental Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the match problem of a capacitive voltage divider with a long measurement cable

et al. 2017

Meas. Sci. Technol.

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“…This will provide a better knowledge of the pulse and avoid any side-effects and unnecessary irradiation of the targeted objects. The measurements of the pulsed power are often carried out through voltage sensors [23][24][25][26][27][28]; however, another important element in the measurement setup is the load device. It fulfills two important roles.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, for the high-voltage UWB pulse termination load, a fast response time, low-inductance with a wide frequency bandwidth ( f c ), at least up to 2.5 GHz for sub-nanosecond pulses of rise times (t r ) down to 140 picosecond, f c = 0.35 t r [29], and high insulation properties must be achieved simultaneously. Several measurements systems based on a voltage divider and a matched load have been published [2,24,28,[30][31][32][33][34][35][36][37][38][39][40][41][42]. However, three main issues can be identified in the termination load devices used in these setups:…”

Section: Introductionmentioning

confidence: 99%

Design, Simulation, and Fabrication of a 500 kV Ultrawideband Coaxial Matched Load and Its Connectors for Fast Transient Pulse Measurement Systems

Khan,

Agazar,

Le Bihan

2023

Energies

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In the past few decades, Pulsed Power (PP) has been one of the fastest growing technologies, with more and more systems frequently emerging in domains such as civil, medical and military. These systems are based on high-voltage pulses, up to several hundreds of kilovolts, with temporal parameters ranging from microsecond levels to sub-nanosecond levels. One of the biggest challenges in this technology is the accurate and precise measurement of the generated PP. The PP measurement systems must possess high-voltage and wideband properties simultaneously, which is often conflicting. The central elements of a PP measurement system are a voltage divider and a termination load. The work presented in this article is dedicated to the second element of the PP measurement system. This paper describes the development of a 50 Ω coaxial termination load and its connectors for a high power ultrawideband (UWB) pulse measurement systems. The principle roles of these devices are to serve as a dummy matched load for the former and to facilitate the connections between different components of the pulse measurement system for the latter. These devices are designed to withstand pulse voltage amplitudes at least up to 500 kV with temporal parameters, such as rise time and pulse duration, varying from nanosecond to sub-nanosecond ranges. The main challenge in the development of a high-voltage UWB termination load is the tradeoff between the high-voltage and wideband characteristics, both of them requiring opposite dimensional aspects for the load device. This challenge is overcame by the special exponential geometry of the load device. The design employs a 30 cm long low-inductance tubular ceramic 50 Ω resistor, enclosed in a critically dimensioned shielding conductor of an exponential inner profile. This shrinking coaxial structure makes it possible to maintain a good level of matching all along the 50 Ω load. The results obtained through 3D electromagnetic modeling and vector network analyzer measurements show good agreement and confirm the reflection coefficient below −27 dB up to at least 2.5 GHz for the load device. Moreover, calculations demonstrate that the load device is very well adapted for nanosecond and sub-nanosecond pulses with voltage peaks as high as 500 kV. These results demonstrate the high-voltage and UWB properties of the developed load device and prove the utilization of this device in the measurement systems for the accurate and precise measurements of the PP.

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“…It is well-known that measuring high voltage is always a critical task as compared with MV and LV, due to the issues associated the high voltage. Among all the potential ways of measuring HV, CDs are frequently adopted to reduce HV, and therefore are one of the most studied [35][36][37][38][39] (see further details below).…”

Section: Introductionmentioning

confidence: 99%

Modeling Stray Capacitances of High-Voltage Capacitive Dividers for Conventional Measurement Setups

et al. 2021

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Stray capacitances (SCs) are a serious issue in high-voltage (HV) applications. Their presence can alter the circuit or the operation of a device, resulting in wrong or even disastrous consequences. To this purpose, in this work, we describe the modeling of SCs in HV capacitive dividers. Such modeling does not rely on finite element analysis or complicated geometries; instead, it starts from an equivalent circuit of a conventional measurement setup described by the standard IEC 61869-11. Once the equivalent model including the SCs is found, closed expressions of the SCs are derived starting from the ratio error definition. Afterwards, they are validated in a simulation environment by implementing various circuit configurations. The results demonstrate the expressions applicability and effectiveness; hence, thanks to their simplicity, they can be implemented by system operators, researchers, and manufacturers avoiding the use of complicated methods and technologies.

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Coaxial Capacitive Dividers for High-Voltage Pulse Measurements in Intense Electron Beam Accelerator With Water Pulse-Forming Line

Cited by 32 publications

References 12 publications

Analysis of the match problem of a capacitive voltage divider with a long measurement cable

Analysis of the match problem of a capacitive voltage divider with a long measurement cable

Design, Simulation, and Fabrication of a 500 kV Ultrawideband Coaxial Matched Load and Its Connectors for Fast Transient Pulse Measurement Systems

Modeling Stray Capacitances of High-Voltage Capacitive Dividers for Conventional Measurement Setups

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