Influence of Rise Time and Fall Time on Surface Discharge Characteristics of PEEK Under Positive Repetitive Square Voltage

Abstract

In this paper, the surface discharge current pulses of PEEK (polyether-ether-ketone) under positive repetitive square voltage are measured. The effects of voltage rise time and fall time on pulse parameters of discharge current, instantaneous voltage of discharge and time-lag of discharge are analyzed in detail. The results show that the amplitude of discharge current and the instantaneous voltage of discharge decrease, and the time-lag of discharge and the dispersion of time-lag increase with the increase of voltage rise time. With the increase of voltage fall time, the amplitude of discharge current decreases and the instantaneous voltage of discharge, the time-lag of discharge and the dispersion of time-lag increase. To analyze the influence mechanism of voltage rise time and fall time on surface discharge, the accumulation of surface charge under repetitive square voltage is regarded as a periodic process. Besides, the correlation between forward discharge and back discharge in the process of discharge is analyzed, and the development of discharge is analyzed by using the time-lag theory. Furthermore, the relationship between instantaneous discharge voltage and voltage slew rate is revealed, and the surface charge accumulation processes under different voltage rise times and fall times are compared to reveal the influence mechanism of rise time and fall time on the surface discharge under positive repetitive square voltage.

Transient electric field of the combined insulation structure under positive periodic square waveform voltage: Analytical analysis and application

“…It should be noted that the calculation of E 1max (∞) is essential when analysing the electric field of composite insulation structure in this condition. However, some existing research work analyses the electric field under the electrostatic field when T ≪ τ e [19]. In this case, it is recommended that the maximum in the PSWSS should be calculated both using the electrostatic field and constant current field by Equation ( 28).…”

“…As illustrated in Equations ( 18), (19), and ( 22), series {u k }, {v k } and {w k } are all positive series. According to the D'Alembert's criterion [35], {u k }, {v k } and {w k } are all convergent exponential series, and the sum of the first k terms can be expressed analytically.…”

“…In experimental studies, extensive efforts have been made to obtain the partial discharge characteristics of power electronics [9,10], the surface charge characteristics [11][12][13], the streamer characteristics [14], accumulation and dissipation of the space charge characteristics [15,16] of engineering insulation materials. Significant progress has been achieved to investigate the dependence of waveform parameters of the PPSW voltage on space charge accumulation characteristics [17], partial discharge characteristics [18], surface discharge characteristics [19], and electric tree characteristics [20,21] of insulation materials. Besides, polarisation characteristics of double-layer composites under the square waveform voltage with only one single cycle were also studied [22].…”

Influence of N 2 pressure on surface discharge characteristics of PEEK under positive repetitive square voltage

“…Different from the partial discharge under the stress of direct current (DC) [5], alternating current (AC) [6] and bipolar square voltage [7,8], forward and backward discharges can be generated at the rise and fall process of positive square voltage in one cycle. Besides, similarly to the surface discharge under bipolar square voltage [9], the surface discharge characteristics under positive repetitive square voltage are affected by residual surface charges, which are greatly influenced by the waveform parameters of positive repetitive square voltage [10][11][12][13][14][15]. Considering the N 2 atmosphere in an IGBT device [12], except for the influence of the waveform parameters of the applied voltage, the influence of N 2 pressure, which is one of atmosphere conditions that affect significantly surface discharge characteristics, should also be further investigated.…”