questions of power system

-
question 1. the insulation resistance of cable of length 10KM is 1Mohm. For a length of 100Km of                         the same cable, the insulation resistance will be...
                            
                                                  R1L1= R2L2
                                                  

                                              1*10= R2*100

                                               R2  =0.1Mohm ANSWER

QUESTION2.  For a 500Hz frq. excitation, a 50 KM long power will be modeled as
                                           
                                                   
                                                 lemda = v/f
                                                
                                                          v=50*500
                                                            = 25000 Km
                                  
                                              velocity for long transmission for long line > 10000Km
                                                
                                                      So we use long line 

Comments

Post a Comment

Popular posts from this blog

transmission line based questions

-
                                        question 3:  Series capacitor compensation in EHV Transmission line is used to           answer:      improves the stability of the transmission line.                                        HOW?                                            xL Is reactance on T. line                                             here capacitive reactance is taking also                                    ...
Read more

ELECTRICAL BASICS

-
PRIMARY BONDS 1. IONIC BONDS 2.COVALENT BONDS 3.METALLIC BONDS IONIC BONDS-    आयनिक  बांड  में  जालक  पोस्टिव और नेगेटिव  आयन का बना है os etcwr oS|qr LFkSfrd attraction ls ca/ks gksrs gSaA Nacl fØLVy esa nksuksa vkos’kkas ds ikl vf/kd pkTksZl gksrs gSaaA ftlls os vf/kd etcwrh ds lkFk ca/ks gksrs gSaA ftlls vk;fud ca/k bl otg ls cgqr gh etcwr gksrs gSaA etcwrh T;knk gS rks os brittle gksaxsA vxj mUgsa gFkkSM+s ls ihVk tk;s rks leku vkos’k ,d lkFk vk tkrs gSaA ftlls riplusion force gksus ls os fØLVy VwV tkrs gSaaA  Covalent bond- bl ca/k ls atom tkyd ls tqM+s jgrs gSaA These atom interlock by a network of covalent bond produce a cystal which is considered to be a single giant molecule. ftlls ;s ca/k etcwr gksrs gSaA vkSj budh xyukad vf/kd gksrk gSA oS|qr pkydrk ca/k ds etcwr gksus ls T;knk gksrh gSA vkorZ lkj.kh esa Åij ls uhps dh vksj tkus ij   c<+rh tkrh gSA  METALLIC BOND- The crystal consist of atoms pre...
Read more

WHAT IS REACTIVE POWER?

-
While the real or active power is the energy supplied to run a motor, heat a home, or illuminate an electric light bulb, reactive power provides the important function of regulating the voltage thereby to helping to move power effectively through the utility grid and transmission lines to where it is required by the load.                                                                     रिएक्टिव पावर वो पावर है जो वोल्टेज को पूरा करता है जितने की मांग होती है लोड को.   example : when we on  the हैवी लोड component it requires the component to  be stable position .THIS REQUIREMENT IS FULFILL BY REACTIVE POWER                     REACTIVE POWER IN NUMERICAL FORM.                           ...
Read more