A kind of high overload transformer oil and its preparation process

A transformer oil, high overload technology, applied in the petroleum industry, base materials, lubricating compositions, etc., can solve the problems of restricting the popularization and application of high overload distribution transformers, unable to meet the requirements of higher grades, etc., and achieve good popularization and application value. , Solve the effect of returning home load and excellent performance

Active Publication Date: 2020-01-31
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents can only meet the requirements of insulation material B-class insulation and heat-resistant grades, and cannot meet the requirements of higher grades, which also limits the popularization and application of high-overload distribution transformers.

Method used

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  • A kind of high overload transformer oil and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A high-overload transformer oil, the high-overload transformer oil is formulated from natural ester insulating oil and mineral insulating oil at a volume percentage of 40%:60%, and its performance parameters are shown in Table 1.

[0030] The preparation method of the natural ester insulating oil comprises the following steps:

[0031] (1) Heat the soybean oil and stir at a speed of 60r / min. When the oil temperature reaches 68°C, add NaOH solution with a concentration of 7°Bé at the same temperature as the oil (the dosage is 10% of the oil weight), NaOH After the addition of the solution, continue to stir for 10 minutes, reduce the rotation speed to 30r / min, continue to stir for 30 minutes, and after standing for 12 hours, drain the saponins at the bottom;

[0032] (2) Heat the soybean oil to 83°C, add distilled water at 91°C at a stirring speed of 80r / min for washing, the amount of distilled water is 15% of the oil weight, keep stirring for 10min, then let stand for 2h...

Embodiment 2

[0043] A high-overload transformer oil, the high-overload transformer oil is formulated from natural ester insulating oil and mineral insulating oil at a volume percentage of 47%:53%, and its performance parameters are shown in Table 1.

[0044] The natural ester insulating oil and mineral insulating oil are the same as in Example 1.

[0045] The preparation process of the above-mentioned high overload transformer oil comprises the following steps:

[0046] (1) Heat the natural ester insulating oil to 85°C under the condition of 30Pa vacuum mechanical stirring, and the stirring speed is 95 r / min;

[0047] (2) Keep the temperature of natural ester insulating oil at 85°C, add mineral insulating oil under 30Pa vacuum condition, first mechanically stir for 25 minutes, then ultrasonically oscillate for 7min, the mechanical stirring speed is 95 r / min, and the ultrasonic oscillation frequency is 25KHz;

[0048] (3) Raise the new transformer oil after vacuum mixing to 105°C, and cont...

Embodiment 3

[0050] A high-overload transformer oil, the high-overload transformer oil is formulated from natural ester insulating oil and mineral insulating oil at a volume percentage of 50%:50%, and its performance parameters are shown in Table 1.

[0051] The natural ester insulating oil and mineral insulating oil are the same as in Example 1.

[0052] The preparation process of the above-mentioned high overload transformer oil comprises the following steps:

[0053] (1) Heat the natural ester insulating oil to 90°C under the condition of 40Pa vacuum mechanical stirring, and the stirring speed is 92 r / min;

[0054] (2) Keep the temperature of the natural ester insulating oil at 90°C, add it to the mineral insulating oil under the vacuum condition of 40Pa, first mechanically stir for 23 minutes, then ultrasonically oscillate for 7min, the mechanical stirring speed is 92 r / min, and the ultrasonic oscillation frequency is 28KHz;

[0055] (3) Raise the new transformer oil after vacuum mixi...

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Abstract

The invention belongs to the technical field of insulating oil for power transformers with high overload capacity, and in particular relates to a high overload transformer oil and a preparation process thereof. The high overload transformer oil is composed of natural ester insulating oil and mineral insulating oil in a volume percentage of 40-57% %: 60%-43% is prepared. In the present invention, the natural ester insulating oil is first heated to 80-95°C under vacuum stirring conditions; then, under vacuum conditions, mineral insulating oil is added to the natural ester insulating oil, and the Stir and then ultrasonically vibrate; finally, the treated transformer oil is subjected to two-stage vacuum filtration treatment, and the closed flash point of the treated oil is ≥155 °C. The transformer oil of the invention has good physical, chemical and electrical properties, low kinematic viscosity, good fluidity, long service life, high overload capacity of transformers with high overload capacity, reduced transformer failures, effectively solves the problem of "returning load", and ensures the safety and stability of transformers. It has good promotion and application value.

Description

technical field [0001] The invention belongs to the technical field of insulating oil for power transformers with high overload capacity, and in particular relates to a high overload transformer oil and a preparation process thereof. Background technique [0002] In order to effectively solve the problems of distribution transformer overload and burning during the Spring Festival and busy farming periods in rural areas, the State Grid Corporation of China proposed a research and development, configuration and application plan for distribution transformers with high overload capacity in rural power grids, and issued the standard Q / GDW 11190-2104 "High Overload in Rural Power Grids". Capacity Distribution Transformer Technical Guidelines, the standard stipulates that the insulation material of high overload distribution transformer should meet the insulation and heat resistance grade standard above Class B, and the hottest point temperature should meet the requirements of GB / T ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M101/00C10M177/00C10N40/16C10N30/08
CPCC10M101/00C10M177/00C10M2203/1006C10M2207/401C10N2020/02C10N2030/02C10N2030/08C10N2040/16
Inventor 杨涛王吉寇晓适吕中宾王天王震宇蒲兵舰马德英马伦付海金张慧潘静鸽
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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