Hi all,

i'm creating this thread for FAQ's......

damu man kita guro pa utos ng asagad sa electricals indi bala?....

game!....

why do we have two major eletrical systems in the philippines?... the 440V and 480V....

why mig haw?

duman ko 220V? tapos ang mga salakyan naman 16V. :P :P

alangya.. ako gani nagapamangkot.... :lol: :lol: :lol:

basically we have 230KV, 115KV kag 64KV..... ang sa mga poste is 34.5KV kag may 4160V man kita which are being used for big machines like chillers, compressors, etc...

but after that, low voltage, we are currently using 480V, stepped down to 277V (lighting usually), 208V and 120V (PC etc)....

sa 440V system naman stepped down to 240V (or 230V or 220V) and 110V

unlike malaysia and SG wherein 380V kag 415V....

and pamangkot ko (kay indi ko kabalo sang sabat)..... ngaa 440/480V gamit ta kag indi 415 or 380V system?.....

Daw ang sabat sini amo-amo gid kon ngaa right hand drive ang HK kag Singapore while Philippines kag Korea left hand drive. Amo-amo man sang AM/FM station sa Japan lain nga frequencies vs diri sa Pinas. Haaay. Ngaa wala ga isa ang kalibutan?

gani man... sini lang nga simana gani ang manugacturing makina nga gindeliver sa amun rated at 415V.... :naughty: :naughty: :naughty: :naughty: :D

Indi na ASM nga makina to?

hehehehe... ASM.... pero may upod nga xformer ah... indi lang galing familiar ang "engr" nga naka assign nga 415V gali ang reqt sang machine nya, ti kundi nahambalan ko nga sala tapping mo sa xformer... hehehehehe

Why do we transmit electricity at high voltage tapos i-drop din lang at the application site? Abi... ;) Not needing experience. This is more of application of the basic electrical equations.

consider the basic formula P = I E

at a constant P, reducing the E will enlarge I and vice versa....

sa pamangkot, why to de transmit high voltage and transform to low voltage before supplying sa consumer?

because, the higher the I, mean the larger your conductor is... and the larger your conductor is, the more costly is your project....

say for example one big motor rated at 600HP motor, 3phase (paki review ang computation ko basi sala)

if you are going to use 4160V, you will only need about 63Amp Breaker, means you will only need about a 22mm2 conductor BUT on the insulation, you are going to use XLPE shielded wire for medium voltage (lipat ko meanig sang XLPE)

if you will bne using a 480V system, you will need about 539Amp Breaker, means you will need to install about 2 sets of 200mm2 cnductor with THHN insulation (again lipat ko meaning sang THHN :lol:)

bottomline, eng'g economy is the reason.... :thumb:

:thumb: :thumb: :thumb:

So according to Toto Rostan, high voltage transmission is cheaper than low voltage due to the cost of the conductor. Tama gid ni sya. Another question is why do we use AC vs DC? Pag-abot sa application, majority of our appliances or loads rectify the supply to DC anyway. *sick

mga equipment engineer sabta nyo ni ho.... from 230KV to 120VAC....lang nahibal'an ko :lol: :lol:

transmission loss :)

madugang lang ko ah, basi pwede man ni nga theory...

DC is using earth as negative ground. once nga mag touch ang imo ngo contactor sa earth, complete dayon imo circuit, so may load ka dayon without knowing it.
The bottom line is masunog ang imo nga wire just because nag gounded ka whereas sa AC, usually may ground fault protector and you wont have any load maski mag touch ang one line sa earth.Sakto man na?
:unsure: :unsure: :unsure:

As of today...

1. transmission loss - AC vs DC
2. ground fault protection

More, more! :lol:

i have no idea..... wala ko nagapamati sang una kay sir Panhilasun ambi..... kainitan gid to sang Inter Eng'g Math Quiz Bee sa La Salle...... :lol:

actually nong, AC is widely used because of the lower cost of transmission lines, nothing much sa losses in the transmission. It is because it is very economical to transform a 150Kv AC power supply to lower voltage such as 480 or 440 than a DC voltage.
Imagine the cost of the Inverter for such purpose compare to a normal transformer.
Di bala nga kon taas imo voltage nubo imo current? so, if nubo imo current, you need smaaler transmission lines. If you do the same sa DC , ti daw dako gid ang bili sang inverter.

and by the way, sa DC distribution system , kinahanglan lapit ang imo nga power plant sa ginasupplyan due to voltage drop sa transmission.

As of today...

1. transmission loss - AC vs DC
2. ground fault protection
3. lower cost of transforming from high to low voltage

More, more! :D