Communiquez avec les autres et partagez vos connaissances professionnelles

Inscrivez-vous ou connectez-vous pour rejoindre votre communauté professionnelle.

Suivre

what will be a possible solution for real time monitoring of Corona Losses in HV Lines??

user-image
Question ajoutée par Engr Qazi Waqar Ali , Applied Engineering Teacher , Technical and Vocational Education & Training
Date de publication: 2013/05/08
Abdalrzak Seafaldean
par Abdalrzak Seafaldean , Data Scientist II , SARY


1- By minimizing the voltage stress and electric field gradient.: This is accomplished by using utilizing good high voltage design practices, i.e., maximizing the distance between conductors that have large voltage differentials, using conductors with large radii, and avoiding parts that have sharp points or sharp edges.

2- Surface Treatments: Corona inception voltage can sometimes be increased by using a surface treatment, such as a semiconductor layer, high voltage putty or corona dope.

3- Homogenous Insulators: Use a good, homogeneous insulator.
Void free solids, such as properly prepared silicone and epoxy potting materials work well.

4- If you are limited to using air as your insulator, then you are left with geometry as the critical parameter.
Finally, ensure that steps are taken to reduce or eliminate unwanted voltage transients, which can cause corona to start.

5- Using Bundled Conductors: on our 345 kV lines, we have installed multiple conductors per phase.
This is a common way of increasing the effective diameter of the conductor, which in turn results in less resistance, which in turn reduces losses.

6- Elimination of sharp points: electric charges tend to form on sharp points; therefore when practicable we strive to eliminate sharp points on transmission line components.

aftab aftab
par aftab aftab , Site Engineer , K.C. Power Infra Pvt. Ltd.

first u should know the factors that affect corona.

1. is frequency . as long as frequency is stable there would be less corona.

2. t line voltage - whenever line voltage exceeds the desruptive critical voltage the ions in atmosphere ionises and causes corona. 

3.  is ofcouse atmosphere as u feels corona in rainy days a lot . now u know the reason why.

4. last is line current.

there is solution of DC transmission line as it offer less corona 

mustafa amer
par mustafa amer , مهندس تشغيل , تحكم الكهرباء المصري

1-good insulators

2- maximize distance between conductors

3-no sharp points

munther khatib
par munther khatib , Senior project manager , Alfanar Construction Company

Skin effect calculation could help

iram shahzad Khan
par iram shahzad Khan , Senior Estimation, Tender Engineer , Bin Omerah Company

The current state of the art in surface treatment provides practical solutions to the need for increasing the surface tension of substrates in the production environment.
However, the technology of surface treatment must advance on two fronts to meet the needs of constantly changing materials (both substrates and coatings) and production parameters.
First, the science of surface treatment must better define the mechanism by which surface treatment affects surface characteristic changes at the molecular level.
Second, the technology of surface treatment must advance to provide adequate treatment levels at ever-increasing web widths and line speeds dictated by the economics of production.