CS234268B1 - Electrotechnical liquid - Google Patents

Abstract

The invention falls into the field of electrotechnology, production of electrotechnical fluids. It provides a composition of an ecologically harmless electrotechnical fluid, composed of 1 to 10% by weight of diphenyl, 35 to 80% by weight of monoisopropyldiphenyl, 7 to 50% by weight of diisopropyldiphenyl, 1 to 25% by weight of the product of polymerization and/or oligomerization of propene with an average molecular weight of 170 to 3000 and 0.1 to 1.5% by weight of an antioxidant. Furthermore, the fluid according to the invention contains 0.1 to 2.0% by weight of acceptors of decomposition products, such as hydroquinone, anthraquinone and 0.1 to 1.0% by weight of hydroacceptors, which are epoxides, such as phenylglycidyl ether and dienebisglycidyl ether.

Description

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The invention relates to an environmentally friendly electrotechnical liquid.

Initially, electrically insulated, specially treated and additive oils have been used as electroinsulating fluids. In recent years, and on an industrial scale, especially for capacitors and transformers, chlorinated diphenyl bases have been important. The development of the basic components of these liquids has gone from the use of high-chlorinated derivatives by chlorine bypass to 52% by weight to lower chlorinated derivatives, which are biologically better degradable. Despite the advantageous properties by which the increased chemical stability, the high relative permittivity and the fire resistance, even the most recent developed fluids and the low chlorine content below 40%, can be used for electrical purposes from an ecological point of view, generally unacceptable and in many countries are currently banned. Further development of synthetic electrolytes has been directed to aromatic compounds such as. for example, alkylated diphenyls, phenylxylylethane and phthalic acid esters. Said liquids are then cooled. antioxidant, hydrogenacceptor and hydroacceptor additives.

Alkylated diphenyl-based liquids described by US Pat. No. 3,796,934, consists of S1.9% by weight mono-isopropyldiphenyl, 31.1% by weight di-isopropyldiphenyl and 17% by weight xyliltolyl sulfon. The use of 80 to 90% by weight monoalkylated diphenyl and containing 20 to 21% by weight dialkyldiphenyl is protected as a condensation liquid. Additives to increase the useful properties of these liquids and antioxidants, hydrogen acceptors and water protected by NSR patent De-OS 29 26 609 · The advantage of using these liquids as dielectrics is the high gas strength and favorable electrical properties at low temperatures below -40 ° C. In the development of 2 - 234 268 and the application of isopropyldiphenyl derivative fluids and the use of a liquid, the kenentration of the di- and discharge of the alkylated derivative in diphenyl in the liquid condenser is only marginally influenced by the electrical properties of the liquids, in particular the breakdown tension and gas transfer, they are more fluid and distinguishable by favorable physical properties, as described in addition to the aforementioned German Patent Application No. De-OS 2934103. Said liquids are distinguished by their high strength, low loss factor, good heat stability and low freezing point. the derivatives do not accumulate in living organisms, they undergo biological degradation. These substances are not toxic (8.0 g / kg live weight) by the reductive flame of these liquids and water. Due to the low polarity of these liquids, they are not susceptible to contamination during operation and are easily refined to the desired purity by clay or synthetic re-liters. Their non-desirable property is, for example, the use of condensers with a combined dielectric or in condensers that only contain a polymeric synthetic film, the film foil being damaged, with changes in the physical-mechanical and electrical properties of the film.

Disadvantages of this kind are eliminated in electrotechnical liquids particularly suitable as a liquid insulator forming a rigid dielectric or part of a dielectric condenser system for increasing the electrical properties of the invention, which is based on the fact that it consists of 1 to 10 wt. % diphenyl, 35 to 80% by weight of monoisepropyldiphenyl, 7 to 50% by weight; diisopropyldiphenyl, 1 to 25% by weight of the product of the metered tape and / or the oligomerization of propene having an average molecular weight of 170 to 3000 and 0.1 to 1.5% by weight. an antioxidant such as 2,6 diterobutyl-4-methylphenel. An electrotechnical liquid-based moss contains 0.1 to 2% by weight of polysaccharides, such as hydroquinone, anthraquinone, and 0.1 to 1% by weight epoxy-acceptors such as phenylglycidyl ether and benzene-glycidyl ether. The advantage of using the liquid according to the invention as an electrical fluid for power capacitors, transformers, electrical circuit breakers and other electrical devices is that the low vapor pressure, low freezing point, electric field stability and aggressive plasmin aggravation are low. chemical substances used as a solid dielectric or as tie materials. The addition of propene polymerization and / or oligomerization products destroys the surface tension of the liquid system, increases electrical strength, and, in particular, enhances tolerability and destroys the interaction with the solid insulation component in the case of some rigid synthetic film dielectrics. In addition, the pre-impregnability is improved for capacitors containing only aluminum synthetic film (All-film). In the case of the use of this liquid in condensers with a plastic film, for example with polypropylene film, the homogeneity of the dielectric is increased. The addition of polymer products and / or oligomerization of propene also achieves a reduction in the hydropacity of the developed electrotechnical fluids. An indispensable advantage of diphenyl, alkyldiphenyl and propane polymerization products and / or oligomerization of propane in a liquid composed solely of alkyldiphenyls is its lower cost of improving the liquid properties. To increase the resistance of the liquid of the invention to ionization, a decomposition acceptor such as hydroquinone, anthraquinone, is added.

In order to increase the hydrolytic stability of the liquid according to the invention, the reactants add water reacting with a high boiling point such as, for example, epoxide compounds.

The biodegradability of the liquid according to the invention was compared with chlorinated diphenyls by means of a test for the biodegradability of organic substances. The methodology uses individual methods of biological analysis, - Standardized for COMECON. After a 5-day incubation, it was found to be 95% biodegradable for the composition of the liquids described in the Examples. Specific decomposition rate is 8 - 6 mgg '' ^ 'h' Under the same conditions, only 25% of chlorinated diphenyl - DELOR 103 - with chlorine content 40 decomposed.

The subject matter of the invention is illustrated by the following examples.

The prepared liquids I, II and III hurt in the form of the above table. 1.

Table 1: Composition of electrotechnical liquid% wt. diphenyl MIPD DIPD PPO anti-oxidant hydrogen acceptor hydro-acceptor liquid I 4 69 15 10 1 0.5 0.5 liquid II 5 40 45 8 1 0.0 1.0 liquid III 6.5 61 18 12 0 5 1.0 1.0

Explanation of the data in Table: HED-mono-isopropyldiphenyl DIPD-di and yields isopropyldiphenyls PPO - polymerization and / or oligomerization products propenantioxidant - 2,6-di-tert-butyl-4-methylphenolhydrogen acceptor - methyl anthraquinone theroacceptor - phenylglycidyl ether For liquids I, II, III of said boT composition. their chemical and electrical properties compared to Wemcol, Condenser Oil " S " and polypropylene-admixture oil, the specific gravity at 20 [deg.] C., the viscosity at 20 [deg.] C., the flash point, were determined; burning point, tgtf, relative permittivity and freezing point The results are shown in Table 2. - 5 -

Table δ. 2: Physico-chemical and electrotechnical properties Cremate liquid liquid liquid Wemcol Condenser min · oil with Annex I II © © "" with "Polypropylene" and "IA" sets. T- r CM CM t- vO ~ at at O IA IA IA · · · · · · · 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ca IA IA CM IA 00 IA t - IA Ol Γ "t - 1 IA oo CM (A IA · A · CM V - IA IA CM CM Ό T- IA Ό CA t - 1 00 o xt íA IA φ A> o IA IA IA IA IA IA IA IA * * * * * * * * * * * * * *

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Claims (3)

P RE D ΜΕ T V 1B Z.o 234 268 1 An electrotechnical liquid particularly suitable as a liquid insulator forming a solid dielectric imepregnant or part of a dielectric array of capacitors for enhancing electrical properties, characterized in that it consists of 1 to 10 wt. % diphenyl, 35 to 80 wt. ronoisopropyl-diphenyl, 7 to 50% hmet. 1 to 25% by weight of the product of pelymerization and / or oligomerization of propene having an average molecular weight of 170 to 3,000 and 0.1 to 1.5% by weight of diisopropyldiphenyl; an antiexidant such as 2,6 di-tert-butyl-4-methylphenol. 2. The electrotechnical liquid according to claim 1, characterized in that it contains 0.1 to 2 wt. decomposition acceptors such as hydroquinone, anthraquinone. 3. The electrotechnical liquid according to claims 1 and 2, characterized in that it contains 0.1 to 1 wt. epexide-based hydroacceptors such as phenylglycidyl ether, dienobyl-glycidyl ether.