Norms of acceptance tests. transformer oil

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Norms of acceptance tests. transformer oil

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.8.36. 1. Oil analysis before pouring into equipment.

Each batch of fresh transformer oil supplied from the factory must be subjected to one-time tests according to the indicators given in Table 1.8.33 before being poured into the equipment. The values of the indicators obtained during the tests should not be worse than those given in the table.

2. Oil analysis before turning on the equipment.

The oil taken from the equipment before it is turned on under voltage after installation is subjected to an abbreviated analysis in the scope specified in the relevant paragraphs of this chapter and the instructions of the manufacturers.

Table 1.8.33. Maximum permissible values of transformer oil quality indicators

Oil quality index and test method standard number	Fresh dry oil before pouring into equipment	Oil immediately after pouring into the equipment
1. Breakdown voltage according to GOST 6581-75, (kV), not less than, electrical equipment:
up to 15 kV inclusive	30	25
up to 35 kV inclusive	35	30
from 60 kV to 150 kV	60	55
from 220 kV to 500 kV	65	60
2. Acid number GOST 5985-79 mg KOH per 1 g of oil, not more, electrical equipment:
up to 220 kV	0,02	0,02
above 220 kV	0,01	0,01
3. Flash point in a closed crucible according to GOST 6356-75, ºС, not lower	135	135
4. Moisture content according to GOST 7822-75, % mass (g/t), not more than GOST 1547-84 qualitatively	0,001% (10 g/t)	0,001% (10 g/t)
a) transformers with film or nitrogen protection, sealed oil-filled bushings and instrument transformers	0,001 (10)	0,001 (10)
b) power and instrument transformers without special oil protection, leaky bushings	0,002% (20)	0,0025% (25)
c) electrical equipment in the absence of requirements of manufacturers for the quantitative determination of this indicator	no	no
5. The content of mechanical impurities GOST 6370-83 and RTM 17216-71 electrical equipment
up to 220 kV inclusive	absence	absence
over 220 kV, %. no more	0,0008	0,0008
6. Dielectric loss tangent GOST 6581-75, %, max, at 90 ºС	1,7	2,0
7. Water-soluble acids and alkalis according to GOST 6307-75	absence	absence
8. The content of the antioxidant additive according to RD 34.43.105-89	0,2	0,18
9. Pour point according to GOST 20287-91
ºС, not higher	-45	-
arctic oil	-60
10. Gas content, % of volume, no more, according to RD 34.43.107-95	0,5	1,0
11. Stability against oxidation according to GOST 981-75 for power and instrument transformers from 110 to 220 kV
a) sediment content, % mass, no more	0,01
b) acid number of oxidized oil, mg KOH per 1 g of oil, no more	0,1

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