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2-4-6 Applica t ion for Condenser Load
Wh en closin g t he con denser cir cu it , t h e electr ic ch a r ge Q = CE of t he con denser cor r espon din g t o t h e inst a nt an eou s
va lu e of power sour ce volta ge at closin g of cir cuit is pr om ptly supplied, a n d r ush cu rr ent flows.
Th e size of t h is r u sh cu r r en t is lim it ed by t h e lin e r esist a n ce a n d in du ct a n ce, a n d fu r t h er lim it ed by in ser t ion of
ser ies rea ctor (6 per cen t of con den ser ca pa cit y, k var )
Th e followin g t able gives th e condenser load a pplicat ions wh en ru sh cur r ent is less t h a n 10 t im es t h e r a ted cur r en t
of condenser by in ser t ion of ser ies r eact or .
Ｔype
H 10C, H 11,H S10
H 20,HS20
H 25,HS25
H 35,HS35
H 50H S50
H 65C
H 80C
H 100C
H 125C
H 150C
H 200C
H 250C
H 300C
H 400C
H 600C
Referen ce: Con version of k va r a nd μF
Sin gle-ph ase: [k va r ] = 2π × 10
3-ph ase:
2-4-7 Applica t ion t o Open in g/Closin g of P rim ar y Side of Tra n sform er
Wh en a pplyin g volt a ge to t h e prim ar y side of t h e tr a nsfor m er , m a gn et ic sat u r a tion ph en om en on occur s a t t h e ir on
cor e of t r a nsform er a n d a r ush cur r ent of excit a t ion flows. The a mou n t of t h is r ush cur r en t va ries wit h t h e volt a ge
ph a se a n d loa d wh en closin g t h e con t a ct or ; t h e a m ou nt of r u sh cu r r en t will be a bou t 20 t im es t h e r a t ed cur r en t
of t h e t ra n sform er . Th e con t a ct or sh ou ld be selected t h at is n ot welded by t h is r ush cu r ren t.
Ta ble 19. Applica t ion to con den ser load
Applied capa cit y to
3-ph ase con denser cir cu it
k va r (A)
In ser tion of ser ies rea ctor
200～220V
380～440V
3(9)
5(14)
7(20)
10(29)
13(38)
18(52)
22(64)
29(84)
34(98)
70(101)
44(127)
88(127)
53(153)
105(152)
65(188)
130(188)
80(231)
160(231)
100(289)
200(289)
150(433)
300(433)
× (F requ ency) × (μF) × (Volt a ge)
-9
[k var ] =√3 × 2π × 10
sin gle-ph a se con den ser circu it
220～240V
4(6)
1.8(9)
8(12)
2.8(14)
12(17)
4(20)
18(26)
5.5(28)
26(38)
7.5(38)
35(51)
10(50)
45(65)
12(60)
55(79)
16(80)
19(95)
25(125)
30(150)
37(185)
46(230)
57(285)
86(430)
× (F requ en cy) × (μF ) × (Volt a ge)
-9
24
Applied capa cit y to
k va r (A)
2-pole ser ies
380～440V
2.4(6)
4.8(12)
6.8(17)
10.5(26)
15(38)
20(50)
26(65)
31(78)
40(100)
50(125)
60(150)
75(188)
92(230)
115(288)
173(433)
2
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