Comparative measurement of surge arrester residual voltages by D-dot probes and dividers

Metwally, I.A.

doi:10.1016/j.epsr.2011.01.015

Cited by 20 publications

(13 citation statements)

References 9 publications

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“…The ZnO varistor ceramics were in the DC bias electric field before ultrafast pulse excitation arriving, which was quite different from other test methods and approximated to the actual working conditions of ZnO varistors for overvoltage protection.…”

Section: Resultsmentioning

confidence: 99%

“…ZnO varistors, with its highly nonlinear current–voltage characteristic, fast response time, low power consumption, superior surge withstanding capability, and high ratio of performance to price, are employed to protect for the electric circuits of information system, control system and high voltage engineering. Studies on the pulse response of ZnO varistors mainly focus on the standard surge current (8/20 μs surge electric pulse) and non‐standard electric pulses (steep wave pulse) . However, those studies involve the use of pulse power supplies or spark‐gap to provide electric pulse excitation, which is difficult to give ZnO varistor ceramics a DC bias in prior to the appearance of a pulse signal.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Test Method for Ultrafast Pulse Response Characteristics of ZnO Varistor Ceramics

Shi

Guo-dong

2013

J. Am. Ceram. Soc.

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A ZnO varistors in series connected with a semi-insulating GaAs photoconductive switches (SI-GaAs PCSS's), a test method for ultrafast pulse response characteristics of ZnO varistor ceramics with DC bias was presented for the first time. The DC voltage distribution of the PCSS's and the varistors was measured in a dark state and the pulse response characteristics of the ZnO varistor ceramics was examined by a nanosecond laser pulse illuminating the PCSS's. The results indicate that the electric pulse output from the varistors includes capacitive current and conduction current and there is a time delay between their peaks. It is revealed that ZnO varistors has a nonlinear conductivity for the nanosecond electric impulse excitation and the barrier capacitance decay constant of the ceramics sample is 105 ns, which is explained through the analysis of examining the material structure and the conductive mechanisms.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Test Method for Ultrafast Pulse Response Characteristics of ZnO Varistor Ceramics

Shi

Guo-dong

2013

J. Am. Ceram. Soc.

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“…Thereafter, the superposition theorem can be adopted to calculate the electric potential and intensity of any position in the electric field. When the transmission conductor is parallel to the ground, if the conductor radius is much smaller than the height of the transmission line to the ground and the voltage in the conductor is three-phase symmetrical sinusoidal then the charges in the transmission conductor will be distributed evenly [18]. …”

Section: Detection Principlementioning

confidence: 99%

Decomposition of Composite Electric Field in a Three-Phase D-Dot Voltage Transducer Measuring System

Wang

Gang

et al. 2016

Sensors

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In line with the wider application of non-contact voltage transducers in the engineering field, transducers are required to have better performance for different measuring environments. In the present study, the D-dot voltage transducer is further improved based on previous research in order to meet the requirements for long-distance measurement of electric transmission lines. When measuring three-phase electric transmission lines, problems such as synchronous data collection and composite electric field need to be resolved. A decomposition method is proposed with respect to the superimposed electric field generated between neighboring phases. The charge simulation method is utilized to deduce the decomposition equation of the composite electric field and the validity of the proposed method is verified by simulation calculation software. With the deduced equation as the algorithm foundation, this paper improves hardware circuits, establishes a measuring system and constructs an experimental platform for examination. Under experimental conditions, a 10 kV electric transmission line was tested for steady-state errors, and the measuring results of the transducer and the high-voltage detection head were compared. Ansoft Maxwell Stimulation Software was adopted to obtain the electric field intensity in different positions under transmission lines; its values and the measuring values of the transducer were also compared. Experimental results show that the three-phase transducer is characterized by a relatively good synchronization for data measurement, measuring results with high precision, and an error ratio within a prescribed limit. Therefore, the proposed three-phase transducer can be broadly applied and popularized in the engineering field.

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“…The critical region between the epoxy resin structure of the D-dot sensor and external air satisfy the equations:

{\begin{array}{l} left & φ_{1} = φ_{2} \\ left & {italicɛ}_{0} \frac{\partial φ_{1}}{\partial n} = {italicɛ}_{1} \frac{\partial φ_{2}}{\partial n} \end{array}

where ε 0 is the air relative permittivity, ε 1 is the dielectric constant of epoxy resin, and n is the outer normal of the interface [18]. …”

Section: Simulation Of Improved D-dot Sensormentioning

confidence: 99%

Design, Experiments and Simulation of Voltage Transformers on the Basis of a Differential Input D-dot Sensor

Wang

Gao

Yang

2014

Sensors

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Currently available traditional electromagnetic voltage sensors fail to meet the measurement requirements of the smart grid, because of low accuracy in the static and dynamic ranges and the occurrence of ferromagnetic resonance attributed to overvoltage and output short circuit. This work develops a new non-contact high-bandwidth voltage measurement system for power equipment. This system aims at the miniaturization and non-contact measurement of the smart grid. After traditional D-dot voltage probe analysis, an improved method is proposed. For the sensor to work in a self-integrating pattern, the differential input pattern is adopted for circuit design, and grounding is removed. To prove the structure design, circuit component parameters, and insulation characteristics, Ansoft Maxwell software is used for the simulation. Moreover, the new probe was tested on a 10 kV high-voltage test platform for steady-state error and transient behavior. Experimental results ascertain that the root mean square values of measured voltage are precise and that the phase error is small. The D-dot voltage sensor not only meets the requirement of high accuracy but also exhibits satisfactory transient response. This sensor can meet the intelligence, miniaturization, and convenience requirements of the smart grid.

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Comparative measurement of surge arrester residual voltages by D-dot probes and dividers

Cited by 20 publications

References 9 publications

A Novel Test Method for Ultrafast Pulse Response Characteristics of ZnO Varistor Ceramics

A Novel Test Method for Ultrafast Pulse Response Characteristics of ZnO Varistor Ceramics

Decomposition of Composite Electric Field in a Three-Phase D-Dot Voltage Transducer Measuring System

Design, Experiments and Simulation of Voltage Transformers on the Basis of a Differential Input D-dot Sensor

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