Revolution

Total Head (M)

H=h+hf  H : total head(M) h : actual head(M) λ: coefficient of friction g : acceleration 9.8m/sec

Q : capacity (㎥/sec) V : m/sec D : diameter (M) A : sectional area(㎡)

Discharge Diameter By Capacity

Discharge Dia.(mm)	Capacity(㎥/min)	Discharge Dia.(mm)	Capacity(㎥/min)

Out Put of Motor 

• Hydraulic Power(KW)=0.163 x H(M) x Q(㎥/min) x  Gravity (H.P)
• 3Phase, Power (KW)= x Voltage(V) x Current(A) x Efficiency(E) x Counter Current ÷ 1,000
• Brake Horse Power →(Power Factor 10% =0.1) (B.H.P)
• Motor Power (KW)=B.H.P x (1+Power Factor) 

No. of Poles and Revolution

Pole	50HZ		60HZ
	Ns	N	Ns	N
- Ns(Synchronous Speed)=(120 x F)/ P [rpm] - N(Pump Revolution frequency)=Ns(1-S) [rpm] - F: frequency(HZ) - P: Pole  S: Slip(%)

Capacity of Generator  

1) General	2) Line-Start or Y-Delta
PG1(Capacity of Generator)=KW/0.8η	PG2= KW x K x S x 0.6
- KW: Output of Motor - η  : Efficiency of Motor	- K: 5~8 - S: D.O.L →1, Y-△ →1/3

Starting Grade of Rotator  

 
  - KVA=((Vortage x A)/(100 x H.P))*ST
  - ST : 1 Phase=1
           3 Phase=1.732 

Temperature Limitation of Motor 

Starting Method of Pump

Starting Method	Capacity
Line Start	15 [KW]
Star-Delta Start	18.5[KW]  ~75[KW]
Reactor Start	90 [KW]
Compensator Start	90 [KW]

Cable

 
e : Voltage (V)  A: Cable Area(㎟)  I: Current (A)  L: Length(m) 

Cable Connecting Method

Connecting method when it is anti-phase