Contoh

Ztm

Ztr a=0,1 Ohm

Itm

Itr

Vtt-1

Vtm

Vtm-1

Ntm

Ntr=53

Vtr

Vtr-1

200 KVA/220-380 V

Ztr b=0,05 Ohm

160 KVA/200-380V

Ztm=0,1 Ohm

Berapa tegangan TM (Vtm) ???

Itr a = 160000 VA/(3x220)V= 242,42 A

Itr b = 200000VA/ (3x220)V= 303 A

Vtr-1 = 220 V + (242,42Ax0,1 Ohm) = 244,242 Volt

Vtm-1=VtrxNtr= 244,242 Vx 53 x 1,73 = 22394,54 volt

I tm = (Itr a + I trb)/Ntr= 10,29 A

Vtm = Vtm-1+ ItmxZtm = 22394,54 + 10,29x0,1= 22395,577 Volt

Tugas

Ztt= 0,13 Ohm

Ztm=0,15 Ohm

Ztr=0,1

Ig

Itt

Itm

Itr

Vg

Vtt

Vtt-1

Vtm

Vtm-1

Ntt=6

Ntm=4

Ntr=30

Vtr

Beban-1 = 200 KVA [1]

Beban-2 = 300 KVA [2]

Beban-3 = 500 KVA [3]

Tentukan Berapa Vg dan Ig

PERHITUNGAN RUGI-RUGI

Ztt

Ztm

Ztr

Ig

Itt

Itm

Itr

Vg

Vtt

Vtt-1

Vtm

Vtm-1

Ntt

Ntm

Ntr

Vtr

Vtr-1

Ig Vg = Vtt Itt [1]

Vtt-1 = Vtt Itt Ztt [2]

Vtt-1 Itt = Itm Vtm [3]

Vtm-1 = Vtm Itm Ztm [4]

Vtm-1 Itm = Vtr Itr [5]

Vtr-1 = Vtr- Itr Ztr [6]

Ntt = Vg/Vtt ; Ntm = Vtt-1/Vtm ; Ntr = Vtm-1/Vtr [7]