95
K78-21
______________________________________________________________________________
WATER COOLED POLYPROPYLENE FILM CAPACITORS
,
,
.
:
.
(K78-21A).
Designed to operate in AC current circuits
and specifically for compensation of
reactive power.
Design:
cylindrical housing made of
polymeric materials with metallic flanges. Can
be delivered with coolers (K78-21A).
K78-21 K78-21A
H
H
H
(4
.
8)
L
15
m
i
n*
(4
.
10 1*)
12
7*
L
L
D
(8
.
12)
20
(4
.
12)
8
D
D
60
*
4 holes 12
8 holes 12
4 holes 8
4 holes 10 1*
1
Design 1
2
Design 2
0,1 .... 68
Rated capacitance
0.1 .... 68 F
250...1000
Rated voltage
250...1000 Vrms
5; 10; 20 %
Capacitance tolerance
5; 10; 20 %
f = 1
0,0005
Dissipation factor at f = 1 kHz
0.0005
(
)
+1 ...+55
o
C
Operating
temperature
range
(obtained by the use of forced or
water cooling)
+1 ...+55
o
C
20
1,5 /
25000
Operating time
25000 hours
:
78-21 - 250 - 1,0
10%
Ordering example:
Capacitor K78-21 - 250 V - 1.0F 10%
97
:
Permissible Urms is expressed by
2 U
2
fC(3.10
-4
Rt + 2 fCReRt + 2fCKp) < A,
= 12
Ur = 250 ,
= 38
.
where = 12 for Ur = 250V, = 38 for Ur>250V
Ur, V
Cr, F
Re, 10
-4
Rt Kp,
10
-4
0.22 0.402
0.33 0.305
0.47 0.255
0.68 0.214
1 0.180
2.2 0.117
3.3 0.250
3.9 0.236
4.7 0.204
6.8 0.154
10 0.127
250
22
0
0.047
0
0.22 8.95 0.385
177.00
0.33 5.96 0.323
82.14
0.47 4.18 0.253
41.66
0.68 2.89 0.238
20.33
1
1.97 0.187 9.55
2.2 0.89 0.125 2.01
3.9 1.39 0.144 2.15
4.7 1.15 0.127 1.48
10 0.62 0.090 0.43
22 0.81 0.048 0.27
33 0.54 0.036 0.12
47 0.73 0.037 0.11
350
68 1.33 0.042 0.15
0.1 11.80
0.416
234.91
0.22 5.36 0.267
52.41
0.33 3.57 0.247
23.82
0.68 1.73 0.167 5.74
1
1.18 0.143 2.68
2.2 1.47 0.130 1.86
3.3 0.98 0.102 0.83
3.9 2.65 0.140 2.16
4.7 2.20 0.123 1.49
6.8 1.52 0.106 0.71
10 1.03 0.050 0.33
22 0.97 0.040 0.15
33 1.67 0.045 0.18
500
47 1.47 0.043 0.16
0.1 23.50
0.514
187.06
0.22 10.68 0.314 41.40
0.33 7.12 0.258
18.77
0.47 5.00 0.217 9.37
1
2.35 0.140 2.10
2.2 1.07 0.095 0.44
3.3 1.71 0.100 0.54
4.7 1.20 0.052 0.27
6.8 0.83 0.039 0.13
800
10 1.64 0.046 0.19
0.1 16.59
0.421
96.68
0.22 7.54 0.262
21.00
0.33 5.03 0.217 9.47
0.47 3.53 0.183 4.71
1
1.66 0.120 1.05
2.2 1.82 0.109 0.60
3.3 1.21 0.043 0.27
4.7 0.85 0.039 0.13
1000
6.8 1.71 0.046 0.21