No-Load Dielectric Losses
No-Load Dielectric Losses
(OP)
Can anybody guide me or refer to any documentation which describes how to calculate the no-load dielectric losses for a 15 kV UD 750 mcm cable?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
No-Load Dielectric Losses
|
No-Load Dielectric LossesNo-Load Dielectric Losses(OP)
Can anybody guide me or refer to any documentation which describes how to calculate the no-load dielectric losses for a 15 kV UD 750 mcm cable?
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: No-Load Dielectric Losses
Losses = Irms * Vrms * powerfactor
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: No-Load Dielectric Losses
EPR dielectric losses are much higher than XLPE.
RE: No-Load Dielectric Losses
RE: No-Load Dielectric Losses
RE: No-Load Dielectric Losses
h
RE: No-Load Dielectric Losses
It is not insignificant for long runs of cable and is one of the reasons that many utilities use XLPE for long UG feeders.
RE: No-Load Dielectric Losses
IEC 60287 "Electric cables – Calculation of the current
rating" or from the old standard:
[According to IEC 287/1982 para 5]:
DIELECTRIC LOSSES:
Wd=2*pi()*frq*CAP*Uo^2*tandelta [w/m] Uo=ULL/sqrt(3)[V]
CAP=epsilonr/18/Ln(INS.DIA/CONDUCT.DIA)/10^9 [F/m]
EXTRAS FROM TABLE III&IV:
Insulation epsilonr tandelta
EPR (U=<36) 3 0.02
EPR(U>36) 3 0.005
PVC 8 0.1
PE(HD,LD) 2.3 0.001
XLPE(U=<36) 2.5 0.004
XLPE(U>36) 2.5 0.001
For 15 kV UD 750 MCM cable [shielded]
Diaoverinsulation=1.41 inches [220 mils ins.thick]
Conductordia=0.97 inches
XLPE insulation epsilonr=2.5 tandelta=0.004
Capacity=2.5/18*ln(1.41/.97)/10^9
CAP=3.71312E-07 F/km
Wd=2*pi()*60*3.71312E-07*(15000/sqrt(3))^2*.004= 42 w/km
WD=42*.3048= 12.8 w/1000ft
Regards
RE: No-Load Dielectric Losses