RU2024979C1 - Method of encapsulation of high- voltage unit with capacitor from organic dielectric - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: high-voltage unit with capacitor from organic dielectric is pumped out to pressure exceeding pressure of saturated steam of fluoride-organic liquid at encapsulation temperature by 133.3-1333 Pa. Then unit is filled with degassed fluoride-organic liquid with rate of its rise in unit equal to 1.0 mm/min. EFFECT: simplified encapsulation technology, increased efficiency of process with keeping of operational life of capacitor in unit. 1 dwg

Description

 The invention relates to electrical engineering and electronics and can be used in the development of energy storage, in particular, in the production technology of high-voltage blocks of capacitors and radioelements.

 A known method of impregnation and pouring capacitors in the housing with liquids based on fully fluorinated hydrocarbons.

The technological process consists of several stages:
1. Evacuation of the capacitor housing during the day at a residual pressure of 10 ^-7 mm Hg

 2. Degassing a liquid in a thin layer during rarefaction slightly exceeding its vapor pressure, in order to remove all free gas and moisture, and filtering the liquid to remove microparticles. In the case of perfluorinated hydrocarbons, this pressure is 3-30 mm Hg. The duration of degassing is 24 hours. Filtration is carried out simultaneously with degassing, and the pore size of the filter is 2 μm.

 3. Filling the housing of the condenser with liquid at a vapor pressure of the liquid and maintaining this pressure for 24 hours

 The disadvantage of this method is the need before filling the pumping casing of air from it at a very low pressure.

The closest analogue and adopted by the authors for the prototype is a method in which, in the manufacture of an electric capacitor having an outer casing containing polymer dielectric material and conductive layers, the dielectric liquid is evacuated to remove gas from it, the liquid is exposed to a pressure lower than atmospheric. Degassed liquid is introduced into the casing, maintaining a reduced pressure inside the casing and around the liquid. The degassed liquid located in the casing is subjected to more than atmospheric pressure to impregnate the dielectric material. The temperature of the material is kept below 60 ° ^C. Then, while the housing sealing around the fluid maintained at a pressure greater than atmospheric.

 The disadvantage of this method is the need for exposure to pressure above atmospheric.

 The aim of the proposed method for pouring a high-voltage block with an organic dielectric capacitor using an organofluorine liquid is to simplify the pouring technology and increase the productivity of the process.

 The drawing shows the installation that implements the proposed method.

The method is as follows. At the installation (drawing), which consists of a filled block 1, a capillary 2, a two-channel fitting 3, a container for degassing a liquid 4, a funnel with a filter 5, a vacuum gauge 6, a trap 7, a level gauge 8, pumps 9, a coupling 10, valves B ₁ - At ₈ .

Before starting work, all valves of the unit are closed. First, the liquid is poured into the funnel with the filter 5. When the valve B _{1 is} opened, the liquid begins to flow into the tank 4. After filling the tank 4 to the required level, the valve B _{1 is} closed, after which the liquid is subjected to preliminary degassing at a residual pressure exceeding the saturated vapor pressure of the liquid by 133.3-1333 Pa, for ≈30 min, which is carried out with open valves B ₄ and ₅ .

A pre-assembled unit 1 is subjected to thermal vacuum dried at 60-70 ^{° C} and a pressure of not more than 60 Pa within a day. To do this, open the valve ₆ on the vacuum pump. After pumping out the housing 1, the valve B _{6 is} closed, the housing of the unit 1 through the nozzle 3 is connected to the capillary 2 using the coupling 10, after which the valves B ₂ , B ₇ , B ₃ are opened. while maintaining the pumping of dissolved gases from the liquid, the latter by gravity begins to fill block 1. The liquid fills it from the bottom up with a speed of 1 mm height per minute. After the appearance of liquid in the control level gauge 8, valves B ₇ , B ₃ and B ₂ are closed. As narrow gaps in the block and in the dielectric packets are filled, the liquid level in the level gauge 8 decreases. Then the listed valves are opened again until the previous level in the level gauge 8 is established, after which the valves are closed again. The operation is repeated until the liquid level in the level gauge is stabilized. Next, block 1 is disconnected and sealed.

 To trap liquid vapor during evacuation, a trap 7 is installed, from where, after filling the block, the condensate is drained and then reused.

Tests conducted by the authors showed that the application of the proposed method of filling the block with an organofluorine liquid provides a high service life of the capacitor with an organic dielectric in the block (35,000 inclusions at a voltage of E _p = 160-180 kV / mm and specific energy W _beats = 200 J / l ) This meets the highest requirements for such devices.

Claims (1)

 METHOD FOR FILLING A HIGH VOLTAGE BLOCK WITH A CAPACITOR FROM AN ORGANIC DIELECTRIC, including evacuating a block, degassing an organofluorine liquid and filling it with a block, characterized in that, in order to simplify the filling technology and increase the productivity of the process, the block is evacuated to a pressure exceeding the pressure of a saturated vapor at an organofluorine temperature pouring, and the pressure value is maintained with an excess of 133.3 - 1333 Pa during the pouring process, and the rate of liquid rise when filling the block in Select and maintain equal to 1 mm / min.

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