Maximum permissible indicators of the quality of transformer oil

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. Maximum permissible indicators of the quality of transformer oil. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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Table 6

№ p / p	Indicator name	Category of electrical equipment	Before pouring		Operational*		Note
№ p / p	Indicator name	Category of electrical equipment	fresher	regenerated	normally admissible	maximum allowable	Note
1	Breakdown voltage, kV, not less than:	Electrical equipment:
		up to 15 kV inclusive	30	30		20
		up to 35 kV inclusive	35	35		25
		up to 150 kV inclusive	60	60	40	35
		220 kV	65	65	60	55
2	Acid number, mg KOH/g oil, not more than	Electrical equipment up to 220 kV inclusive	0,02	0,05	0,1	0,25
3	Flash point in a closed crucible, °C, not below	Electrical equipment up to 220 kV inclusive	135	130	Decreased by no more than 5°C compared to the previous analysis	125
4	Moisture content, % mass (g/t), not more than:	Transformers with film and nitrogen oil protection, sealed oil-filled bushings, sealed instrument transformers	0,001 (10)	0,001 (10)	0,0015 (15)	0,0025 (25)	It is allowed to determine this indicator by the Karl Fischer method or the chromatographic method
		Power and instrument transformers, leaky oil-filled bushings	-	0,002 (20)	-	0,003 (30)
		Electrical equipment, in the absence of requirements of manufacturers for the quantitative determination of moisture content	Absence of	Absence of	Absence of	Absence of
5	Content of mechanical impurities: % (purity class, no more)	Electrical equipment up to 220 kV	Absence (11)	Absence (11)	Absence (13)	Absence (13)
6	Dielectric loss tangent at 90 °С, %, no more	Power transformers up to 220 kV	1,7	1,5		5
6	Dielectric loss tangent at 90 °С, %, no more	Instrument transformers up to 220 kV	1,7
		Electrical equipment:
		up to 150 kV inclusive			8	10
		220 kV		5	5	7
7	Content of water-soluble acids and alkalis:	Electrical equipment up to 220 kV inclusive	Absence of	Absence of
		Power transformers, sealed instrument transformers and oil-filled bushings			0,014	-
		Leaky instrument transformers and oil-filled bushings			0,03	-
8	Content of antioxidant additive (AGIDOL-1 (2,6-ditretbutyl-4-methylphenol or ionol)), wt %, not less than	Electrical equipment up to 220 kV inclusive	0,2	0,18	0,1
9	Pour point, ° С, not higher	Electrical equipment flooded with arctic oil	-60	-60	-	-
10	Gas content in accordance with the instructions of the manufacturer,% of volume, no more	Film-protected transformers, sealed oil-filled bushings up to 220 kV	0,1 (0,5)	0,1 (0,5)	2	4
11	Content of soluble sludge, % mass, no more	Power and instrument transformers, leaky oil-filled bushings up to 220 kV	-	-	-	0,005
12	Content of furan derivatives, wt %, max (including furfural)	Transformers and oil-filled bushings up to 220 kV	-	-	0,0015 (0,001)
13	Sulfur content, %, no more	Electrical equipment up to 220 kV inclusive	-	0,6	-	-

*For transformer oil, two areas of operation are established:
normally permissible - within the specified limits of changes in the characteristics of the oil, the normal operation of electrical equipment is guaranteed, the control of the oil condition is carried out according to indicators 1 - 3 of the table (abbreviated analysis);
maximum permissible - with oil characteristics above those indicated as “normally permissible”, but below “maximum permissible”, it is required to establish a more frequent and extended control of the oil condition and take measures to restore the operational properties of the oil or provide for an oil change.

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

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