SU761543A1 - Electroinsulating oil - Google Patents

Description

The invention relates to oils used as a heat-conducting and electrically insulating medium in oil-filled equipment: transformers, capacitors, cables, etc.

A well-known insulating oil containing aromatic amine, phenyl-a-naphthylamine and phenyl-p-naphthylamine [11 The disadvantage of this oil is that it includes amine additives, which, when oxidized, tend to form products that are not soluble in petroleum oils. The latter leads to an increase in sedimentation of the oil during aging.

Production of electrical insulating oil with increased stability of the dielectric loss tangent during oxidative aging in the presence of an electric field is necessary to improve electrical equipment operation. The tangent of dielectric loss angle is one of the main indicators of the quality of electrical insulating oils and characterizes the power loss in electrical equipment due to the conductivity of the oil.

Electrical insulating oils should

have low values of this indicator in

the original form and not to increase it during aging during operation. Boost

2

the stability of this indicator is ultimately aimed at lengthening the life of oil in electrical equipment.

Known electrical insulating oil, 5 containing petroleum oil with the addition of 0.2-0.5 weight. % 2,6-di-tert.-butyl-4-methylphenol (ionol) [2].

It is also known insulating oil based on petroleum oil, containing 0.2-0.5 weight. % ionol and 0.01— 0.1 weight. % quinisarine [3].

The disadvantage of this oil is that during prolonged oxidation in the presence of an electric field and significant

15 quantities catalyzing the oxidation of copper, the value of the tangent of dielectric loss angle is rapidly decreasing.

The aim of the invention is to increase

20 stability of the dielectric loss tangent with oxidative aging and prolonged oil life.

This goal is achieved by the fact that the insulating oil containing

25 carbon oil and 2,6-di-tert.-butyl-4methylphenol, additionally contains 1- (diethylaminomethyl) - benzotriazole in the following ratio of components, weight. %:

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four

with the following characteristic:

Kinematic viscosity

3

2,6-Dy-tert.-butyl-4-methylphenol 0.1-0.5

1- (Diethylaminomethyl) benzotriazole 0.002–0.1

Hydrocarbon oil Up to 10

As a hydrocarbon oil can be used petroleum or synthetic oil.

When introduced into ionol-inhibited insulating oil, 1- (dialkylaminomethyl) -benzotriazole, the value of the dielectric loss tangent practically does not change even with very long aging of the oil.

Electrical insulating oil is prepared by adding an additive — 1- (diethylaminomethyl) -benzotriazole — to inhibited by ionol samples of oil with thorough mixing at 60–70 ° C.

In this way, prepare eight samples of oil (see tab. 1).

As the oil used distillate low-sulfur paraffin oil, subjected to phenolic purification, dewaxing and contact cleaning,

at 50 ° C, cSt 8.5 δ- Flash point in closed crucible, ° С Density at 20 ° С, g / cm ³ 155 0.856 Pour point, ° С —45 Aromatic content ΙΟ xy fractions when separated on silica gel,% 15

Aliphatic oil obtained by polymerization of α-olefins (Ce – C _{] 4} ) is used as a synthetic oil, followed by hydrogenation of the polymerizate, 15 with the following characteristics:

Kinematic viscosity at

50 ° C, cSt Flash point in 80 covered crucible, ° С 180 Pour point, ° С Content of aromatic fractions determined by —46 by dividing by silica gel,% 0.5 The compositions of the prepared oil samples are given in table. one. Table 1

Component Content, weight. % Oil sample number I 2 3 four five 6 7 eight Ionol 0.2 0.2 0.1 0.2 0.1 0.5 0.3 0.3 1- (Depethylamchel) -benzotriazole '- 0,002 0,005 0.01 0.1 0,002 - 0.02 Synthetic oil - - - - - - Rest Rest Oil oil Rest Rest Rest Rest Rest Rest - -

The obtained samples of electrical insulating oil on the basis of e-oil are tested by the method of the All-Union Electrotechnical Institute in a glass device at 95 ± 0.2 ° C under the influence of an electric field of 5 kV / mm in the presence of a copper helix with a surface

1.5 cm ² / g of oil and the free access of air to the surface of the oil.

To compare the effectiveness of the oil according to the invention, three samples of oil prepared on an oil basis with the composition of additives ionol - quinizarin are tested in the following ratio of components, weight %:

Sample 9.

Ionol 0,2

Quinizarin 0.01

Oil Oil Else

Sample 10.

Ionol 0,2

Quinizarin 0.02

ν Oil Oil Else

Sample 11.

Ionol 0,1

Quinizarin 0.1

Oil Oil Else

30 Samples of electrical insulating oils based on synthetic oils are tested according to the method adopted for cable oils by aging under static conditions at 130 ° C in the presence of a copper catalyst.

35 with a duration of 300 hours

The test results of electrical insulating oil based on petroleum and synthetic oils are given respectively in Table. 2 and 3.

40 Tests allow to establish that the addition of 1- (diethylaminomethyl) -benzotriazole additive to ionol-inhibited hydrocarbon oils increases the stability of the dielectric tangent of 45 skich losses. I- (Diethylaminomethyl) -benzotriazole, added to petroleum oil in the same concentration as quinizarin, stabilizes tangent more effectively

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table 2

five

The rate of oil during aging during the time h

room sample 0 240 720 960 1200 1500 acid number, , mg KOH / g with ""and '2-, acidic number, mg KOH / g £ 2 Si with -h and GO about acidic number, ; mg KOH / g TO E * about acidic number, mg KOH / g five TO * and ec> o acidic number, mg KOH / g g yo © ch- Ν- acidic number, mg KOH / g TO SIZH WITH * and about 2ί® % y * about to sz about about I 2 3 four five 6 7 eight 9 YU eleven 12 13 14 one 0.015 0.29 0.03 6.3 0.10 10.2 0.18 16.4 0.26 20.3 0.36 25.2 0.030 2 0.015 0.41 0.049 0.24 0.03 0.31 0.028 0.30 0.029 о.з 0.03 0.31 0.001 3 0.020 0.38 0.035 0.40 0.037 0.38 0.035 0.37 0.034 0.38 0.064 0.40 0.001 four 0.022 0.21 0.036 0.31 0.023 0.35 0.034 0.36 0.026 0.35 0.05 0.42 0.001 five 0.025 0.20 0.028 0.30 0.035 0.40 0.04 0.51 0.072 0.63 0.09 0.66 0,002 6 0.020 0.36 0.026 0.33 0.035 0.28 0.042 0.26 0.046 0.31 0.05 0.30 0.0905 9 0.015 0.28 0.043 1.8 0.09 0.83 0.12 6.24 0.16 7.13 0.20 8.12 0,006 ten 0.015 0.22 0.025 0.21 0.07 0.32 0.09 0.53 0.10 0.73 0.15 1.34 0,002 eleven 0.020 0.10 0.026 0.022 0.031 0.06 0.038 0.22 0.063 0.52 0.096 0.97 0,0015

* - dielectric loss tangent.

Table 3

room sample % initial value after aging 7 0.1 0.2 eight 0.06 0.08

dielectric loss angle. For example, petroleum oil containing 0.2 weight. % ionol and 0.01 wt. % 1- (diethylaminomethyl) -benzotriazole, after 1500 hours of aging 15 in the VEN device, the dielectric loss tangent is 0.42%. The same oil containing 0.2 wt. 1% ionol and 0.01 wt. % of quinizarin, after aging under the same conditions, has a dielectric tangent of 20 loss 8.12% ·

In addition, it was found that the additive - 1 - (diethylaminomethyl) -benzotriazole, added in a concentration of 0.002 weight. % (Example 2) stabilizes the tangent of the dielectric loss angle of oil more effectively than quinizarin at a concentration of 0.01 wt. % (example 3).

Practically constant values of the dielectric loss tangent of the test samples of hydrocarbon oils containing, in addition to ionol, in addition

additive - 1- (diethylaminomethyl) - benzotriazole, with prolonged aging in the presence of an electric field suggests that this composition is most effective when the concentration of the latter is 5-10 times less than the concentration of quinizarin.

Claims (2)

Claim Insulating oil containing hydrocarbon oil and 2,6-di-tert.-butyl4-methylphenol, characterized in that in order to stabilize the dielectric loss tangent of oil during aging and prolong the life of the oil, it additionally contains 1- (diethylaminomethyl) benzotriazole at the following ratio of components, weight. %: 2,6-di-tert.-butyl-4-methylphenol 0.1—0.5 1- (Diethylaminomethyl) benzotriazole 0.002–0.1 Hydrocarbon oil Up to 10