Internal On-line Partial Discharge Analysis of 68.75 MVA Generator Stator Winding Insulation

2016 ◽  
Vol 6 (5) ◽  
pp. 2088 ◽  
Author(s):  
Waluyo Waluyo ◽  
Siti Saodah ◽  
Eltha Hidayatullah
Keyword(s):  
Electric Field ◽  
Partial Discharge ◽  
Surface Discharge ◽  
Damage Effect ◽  
Stator Winding ◽  
Measuring Point ◽  
Temperature Detector ◽  
On Line ◽  
Winding Insulation ◽  
Generator Stator

<p>Partial discharge is a phenomenon of electron ionization occurs due to concentrated electric field in a different edge plane. This phenomenon will be investigated by an electric field measurement in a measuring point. The internal partial discharge will give the insulation damage effect on a generator stator winding due to void existence. This manuscript presents the measurement results of the on-line internal partial discharge on the stator winding insulation of 68.75 MVA generator. It used the resistant temperature detector method and CM2000<sup>TM</sup>. The results were classified into three conditions based on the voids in the generator stator insulation, the internal delamination and the surface discharge.</p>

scholarly journals Internal On-line Partial Discharge Analysis of 68.75 MVA Generator Stator Winding Insulation

2016 ◽  
Vol 6 (5) ◽  
pp. 2088 ◽  
Author(s):  
Waluyo Waluyo ◽  
Siti Saodah ◽  
Eltha Hidayatullah
Keyword(s):  
Electric Field ◽  
Partial Discharge ◽  
Surface Discharge ◽  
Damage Effect ◽  
Stator Winding ◽  
Measuring Point ◽  
Temperature Detector ◽  
On Line ◽  
Winding Insulation ◽  
Generator Stator

<p>Partial discharge is a phenomenon of electron ionization occurs due to concentrated electric field in a different edge plane. This phenomenon will be investigated by an electric field measurement in a measuring point. The internal partial discharge will give the insulation damage effect on a generator stator winding due to void existence. This manuscript presents the measurement results of the on-line internal partial discharge on the stator winding insulation of 68.75 MVA generator. It used the resistant temperature detector method and CM2000<sup>TM</sup>. The results were classified into three conditions based on the voids in the generator stator insulation, the internal delamination and the surface discharge.</p>

Problems with modern air-cooled generator stator winding insulation

2000 ◽  
Vol 16 (6) ◽  
pp. 6-10 ◽  
Author(s):  
G. Griffith ◽  
S. Tucker ◽  
J. Milsom ◽  
G. Stone
Keyword(s):  
Stator Winding ◽  
Winding Insulation ◽  
Generator Stator

Generator Stator End Winding Resonance: Problems and Solutions

2013 ◽  
Author(s):  
Bill Moore ◽  
Clyde Maughan
Keyword(s):  
Visual Inspection ◽  
Fatigue Cracking ◽  
Vibration Monitoring ◽  
Stator Winding ◽  
Resonant Vibration ◽  
Primary Methods ◽  
Stator Windings ◽  
Problems And Solutions ◽  
On Line ◽  
Generator Stator

Stator windings that are in resonance will have high levels of vibration, if not properly damped or braced. Windings in resonance can suffer from early conductor strand fatigue cracking, arcing and failure during operation. Evidence of high vibration can sometimes be seen through visual inspection, with observance of dusting and greasing. There are two primary methods to anticipate and detect end winding resonant vibration — the bump test and on-line monitoring. Both are important and play a key role in identifying stator winding resonance problems, as well as implementing the appropriate solution. This paper will discuss the reasons that stator end winding resonance occurs. The technology, as well as the advantages and limitations of both the bump test and vibration monitoring, will be discussed. Solution approaches to end winding vibration are included, as well as one case history.

Assessment of Insulation Degradation in Rotating Machines

2006 ◽  
Vol 321-323 ◽  
pp. 582-585
Author(s):  
Hee Dong Kim
Keyword(s):  
Nondestructive Test ◽  
Partial Discharge ◽  
Dissipation Factor ◽  
Stator Winding ◽  
Current Increase ◽  
Increase Rate ◽  
Insulation Degradation ◽  
Ac Current ◽  
Current Dissipation ◽  
Winding Insulation

To assess the degradation of stator winding insulation in high voltage motor, a total of forty-eight coils were manufactured. These coils are classified into five groups and there are twelve strands in each coil. Four coil groups are artificial defects such as shorted turn of strand, internal separation between conductor and insulation, large void within insulation and removal of semi-conductive tape. The other coil group is normal. Before ac breakdown test was performed, nondestructive test that included ac current, dissipation factor and partial discharge (PD) was done with five coil groups. This paper carried out by comparing the results between nondestructive test and ac breakdown test. When the values of ac current increase rate, tip-up dissipation factor and PD magnitude are large, the insulation is occurred the deterioration. AC breakdown voltage is also low in degraded insulation.

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