24
2-4-6 Application for Condenser Load
When closing the condenser circuit, the electric charge Q = CE of the condenser corresponding to the instantaneous
value of power source voltage at closing of circuit is promptly supplied, and rush current flows.
The size of this rush current is limited by the line resistance and inductance, and further limited by insertion of
series reactor (6 percent of condenser capacity, kvar)
The following table gives the condenser load applications when rush current is less than 10 times the rated current
of condenser by insertion of series reactor.
Table 19. Application to condenser load
Applied capacity to
3-phase condenser circuit
kvar (A)
Applied capacity to
single-phase condenser circuit
kvar (A)
Insertion of series reactor 2-pole series
Ｔype
200～220V 380～440V 220～240V 380～440V
H10C, H11,HS10 3(9) 4(6) 1.8(9) 2.4(6)
H20,HS20 5(14) 8(12) 2.8(14) 4.8(12)
H25,HS25 7(20) 12(17) 4(20) 6.8(17)
H35,HS35 10(29) 18(26) 5.5(28) 10.5(26)
H50HS50 13(38) 26(38) 7.5(38) 15(38)
H65C 18(52) 35(51) 10(50) 20(50)
H80C 22(64) 45(65) 12(60) 26(65)
H100C 29(84) 55(79) 16(80) 31(78)
H125C 34(98) 70(101) 19(95) 40(100)
H150C 44(127) 88(127) 25(125) 50(125)
H200C 53(153) 105(152) 30(150) 60(150)
H250C 65(188) 130(188) 37(185) 75(188)
H300C 80(231) 160(231) 46(230) 92(230)
H400C 100(289) 200(289) 57(285) 115(288)
H600C 150(433) 300(433) 86(430) 173(433)
Reference: Conversion of kvar and μF
Single-phase: [kvar] = 2π × 10
-9
× (Frequency) × (μF) × (Voltage)
2
3-phase: [kvar] =√3 × 2π × 10
-9
× (Frequency) × (μF) × (Voltage)
2
2-4-7 Application to Opening/Closing of Primary Side of Transformer
When applying voltage to the primary side of the transformer, magnetic saturation phenomenon occurs at the iron
core of transformer and a rush current of excitation flows. The amount of this rush current varies with the voltage
phase and load when closing the contactor; the amount of rush current will be about 20 times the rated current
of the transformer. The contactor should be selected that is not welded by this rush current.
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