Bushing Oil Characteristics And Accessories - GE PHI 530.1425.2500 Operating And Maintenance Instructions Manual

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Bushing oil characteristics and accessories

The PHI bushings are filled Nynas Nytro 4000 A mineral oil. The same type of oil must be used in case of re-
filling or oil reprocessing.
At the end of the drying and impregnation process in GE factory, the bushing oil parameters are in accordance
with the data listed in the following Table 8.
Parameter
Water content by Karl Fisher at 20° C
Breakdown voltage on 2.5 mm gap
Total gas content
Total combustible gases
Power factor at 90° C
Resistivity at 30° C
Particle content
Table 8 – Oil parameters for final oil filling and recirculation at the factory production
Concerning the ISO 11218 solid contamination limits classes, next Table 9 summarizes the quantities and the
size limits for each class.
Classes
Table 9 – Solid contamination limits classes according ISO 11218
NOTE: The excellent quality of the oil process in the factory is such that the bushing does not require any
additional oil treatment before the transformer tests or before the installation on site.
HVDC TRANSFORMER BUSHINGS
Maximum Contamination Limits (particles/100ml)
ISO 11218 > 4
µm(c)
000 195
00 390
0 780
1 1560
2 3120
3 6250
4 12500
5 25000
6 50000
7 100000
8 200000
9 400000
10 800000
11 1600000
12 3200000
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
≤ 200 ppm (0.02%)
< 10 ppm (0.001%)
≥15 10
ISO11218 Class 00
> 6 >14
µm(c) µm(c) µm(c)
76 14
152 27
304 54
609 109
1220 217
2430 432
4960 864
9730 1730
19500 3460
38900 6920
77900 13900
156000 27700
311000 55400
623000 111000 19600
1250000 222000 39200
IS 2664 GB
Page 17 of 70
Limit
≤ 2 ppm
≥ 80 kV
≤ 0.0025
12
Ohm x m
> 21 > 38 > 70
µm(c) µm(c)
3 1 0
5 1 0
10 2 0
20 3 1
39 6 1
76 11 2
152 22 4
306 45 8
6012 90 16
1220 180 32
2450 360 64
4900 720 128
9800 1440 256
2880 512
5760 1024