Effect of high voltage transients on surface discharge characteristics of oil-paper insulation

2015 ◽  
Author(s):  
Roya Nikjoo ◽  
Nathaniel Taylor ◽  
Hans Edin
Keyword(s):  
High Voltage ◽  
Surface Discharge ◽  
Discharge Characteristics ◽  
Voltage Transients ◽  
Paper Insulation

Discharge and Flashover Behavior in Oil-Paper

2020 ◽  
pp. 105-128
Keyword(s):  
Electric Field ◽  
Operating Conditions ◽  
Surface Discharge ◽  
Discharge Characteristics ◽  
Dc Voltage ◽  
Composite Field ◽  
Field Distortion ◽  
Lightning Impulse ◽  
Creeping Discharge ◽  
Paper Insulation

Due to special operating conditions, the valve side bushing of the converter transformer connected to the converter valve is subject to complex voltage excitation, including DC voltage, AC/DC composite voltage, lightning impulse overvoltage, or composite voltage of operating overvoltage and DC. Under the action of this complicated electric field, the oil-paper insulation of the valve-side bushing of the converter transformer is prone to electric field distortion due to charge accumulation, which causes a surface discharge, which will seriously cause the edge breakdown. At the same time, since the temperature in the converter transformer rises due to a large amount of loss during the operation of the transformer, creeping discharge is more likely to occur under the electrothermal composite field. Hence, it is significant to carry out research on the surface discharge characteristics of the oil-paper insulation on the valve side of the converter transformer under the electrothermal composite field.

scholarly journals Effect of High Voltage Impulses on Surface Discharge at the Oil-Paper Interface

2018 ◽  
Author(s):  
R Clemence Kizza ◽  
M Ghaffarian Niasar ◽  
R Nikjoo ◽  
X Wang ◽  
H Edin
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Electrical Power ◽  
Test Sample ◽  
Surface Discharge ◽  
Electrical Power Systems ◽  
Lightning Strikes ◽  
Complete Breakdown ◽  
Voltage Transients ◽  
Discharge Patterns

<p>High voltage transients in electrical power systems are mainly caused by lightning strikes and switching operations. The high voltage transients above the basic insulation level (BIL) would degrade the electrical insulation of the equipment.<br />In this work, the effect of high voltage impulses on the trend of the surface discharge at the oil-paper interface was investigated. The partial discharge patterns were recorded by the Insulation Condition Monitoring (ICM) system. The HV impulses were generated by a standard 1.2/50 μs HV impulse generator. The measurement results presented in this paper seem to show that surface<br />discharge would cause complete breakdown (continuous flashovers) at the oil-paper interface much faster when the test sample is first aged by HV impulses compared<br />to when it is unaged.</p>

scholarly journals Effect of High Voltage Impulses on Surface Discharge Characteristics of Polyethylene

2017 ◽  
Author(s):  
Roya Nikjoo ◽  
Nathaniel Taylor ◽  
Hans Edin
Keyword(s):  
High Voltage ◽  
Similar Case ◽  
Surface Discharge ◽  
Discharge Characteristics ◽  
Surface Flashover ◽  
Subsequent Application ◽  
Surface Discharges ◽  
Transient Voltages ◽  
Number Of Discharges

<p>This paper investigates the influence of high voltage impulses on the surface discharge characteristics of polyethylene (PE) during subsequent application of 50 Hz AC voltage. The investigation is done on two types of PE to examine the generality of the phenomena. The effect of impulses on the surface discharge features of PE are studied for both cases of having either a streamer or flashover. For each case, the consecutive surface discharges behave differently when the insulation has been exposed to the transient voltages. <br />The effect of impulses on surface discharge of PE is shown by the change of PD numbers and phase-resolved PD patterns. The results show a prompt change in the total number of discharges which decays with the time. After a surface flashover has occurred due to the impulse, the PD behaves quite differently compared to the similar case without flashover.</p>

Study on dielectric surface discharge in transformer oil under high voltage nanosecond pulse

2005 ◽  
Vol 63 (6-10) ◽  
pp. 665-671 ◽  
Author(s):  
J. Wang ◽  
Y.X. Zhou ◽  
P. Yan ◽  
W.L. Huang ◽  
G.J. Li ◽  
...  
Keyword(s):  
High Voltage ◽  
Dielectric Surface ◽  
Nanosecond Pulse ◽  
Transformer Oil ◽  
Surface Discharge

Space charge phenomena in oil-paper insulation materials under high voltage direct current

2009 ◽  
Vol 67 (2-3) ◽  
pp. 417-421 ◽  
Author(s):  
Yuanxiang Zhou ◽  
Yunshan Wang ◽  
Guangfan Li ◽  
Ninghua Wang ◽  
Yingyan Liu ◽  
...  
Keyword(s):  
Space Charge ◽  
High Voltage ◽  
Direct Current ◽  
Insulation Materials ◽  
High Voltage Direct Current ◽  
Paper Insulation

Design of a Nanosecond High Voltage Surface Discharge Switch

2007 ◽  
Author(s):  
D.B. Pawelek ◽  
P.A.A.F. Wouters ◽  
A.J.M. Pemen ◽  
A.H. Kemper ◽  
G.J.H. Brussaard
Keyword(s):  
High Voltage ◽  
Surface Discharge
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