摘要:
A biodegradable soybean oil based electrically insulating fluid. The base oil is hydrogenated to produce maximum possible stability of the soybean oil, and can be winterized to remove crystallized fats and improve the pour point of the base oil without the necessity of heating the oil. The base oil can also be combined with an additive package containing materials specifically designed for improved pour point, improved cooling properties, and improved dielectric stability.
摘要:
High oleic acid triglyceride compositions that comprise fatty acid components of at least 75% oleic acid, less than 10% diunsaturated fatty acid component; less than 3% triunsaturated fatty acid component; and less than 8% saturated fatty acid component; and having the properties of a dielectric strength of at least 35 KV/100 mil gap, a dissipation factor of less than 0.05% at 25.degree. C., acidity of less than 0.03 mg KOH/g, electrical conductivity of less than 1 pS/m at 25.degree. C., a flash point of at least 250.degree. C. and a pour point of at least -15.degree. C. are disclosed. Electrical insulation fluids comprising the triglyceride composition are disclosed. Electrical insulation fluids that comprise the triglyceride composition and a combination of additives are disclosed. Electrical apparatuses comprising the electrical insulation fluids and the use of electrical insulation fluids to provide insulation in electrical apparatuses are disclosed. A process for preparing the high oleic acid triglyceride composition is disclosed.
摘要:
An uninflammable insulating liquid is obtained by adding an emulsifying agent having a volume ratio of 1 to 3% to an insulating liquid containing a fluorocarbon liquid of at least 25% in a volume ratio to cause emulsification. In this liquid mixture, when polyol ester or polydimethylsiloxane is used as the insulating liquid, an uninflammable insulating liquid that does not cause pollution or an environmental problem can be obtained. When tricresyl phosphate is used as the insulating liquid, an uninflammable insulating liquid having a dielectric constant close to that of insulating paper can be obtained. A liquid pipe for circulating a fluorocarbon emulsion in a tank is provided outside the tank, and a pump and a stirrer are connected midway along the liquid pipe to constantly stir the fluorocarbon emulsion, thereby preventing it from being separated into two layers. When a radiator is provided to the liquid pipe, the stirring system for the fluorocarbon emulsion can also serve as the cooling system.
摘要:
The electrical resistivity of hindered polyol ester lubricants can be raised to very high levels by treating the lubricants with activated alumina, preferably after the acid values of the lubricants treated have already been reduced to low levels by conventional refining with alkali or other acid scavengers.
摘要:
A method for enhancing the dielectric properties of a new or in-service electrical cable is disclosed, the method comprising supplying the interstitial void space of the cable's conductor with a fluid mixture comprising(A) an antitreeing agent; and(B) a water-reactive compound,wherein (B) has a diffusion coefficient of at least 1.times.10.sup.-7 cm.sup.2 /second at 50.degree. C. in the insulation of the cable and the mixture has an initial viscosity of .ltoreq.100 cP at 25.degree. C. The instant method provides a more symmetrical distribution of dielectric enhancing fluid in the insulation than prior art fluids and results in a significant reduction in cable treatment time.
摘要翻译:公开了一种用于增强新的或在使用中的电缆的介电性能的方法,所述方法包括:提供电缆导体的间隙空隙,其中包含(A)抗静电剂的流体混合物; 和(B)水反应性化合物,其中(B)在电缆的绝缘中在50℃具有至少1×10 -7 cm 2 /秒的扩散系数,并且混合物具有 = 100的初始粘度 cP在25℃。本方法提供了绝缘体中介电增强流体比现有技术流体更对称的分布,并导致电缆处理时间的显着减少。
摘要:
The present invention is directed to the production of a formulated transformer oil by the process involving fractionating the product coming from a hydrocracker to produce a distillate boiling in the transformer oil range, dewaxing the fraction, optionally hydrofinishing the fraction and adding to said fraction an effective amount of anti-oxidant and/or pour point depressant. The formulated transformer oil produced by this process has properties equivalent to those of formulated naphthenic transformer oil.
摘要:
A grease composition comprising oil, colloidal particle filler, and, optionally, a bleed inhibitor is disclosed. The grease typically has a critical yield stress below 140 Pa at 20.degree. C., preferably below 70 or 35 Pa. The grease can advantageously be used as a cable filling material, especially for optical fiber cable. In the latter case it can result in cable having substantially no cabling loss. Preferred compositions comprise 77 to 95% b.w. of ASTM type 103, 104 A, or 104B paraffinic or naphthenic oil, or polybutene oil; 2 to 15% b.w. of hydrophobic or hydrophilic fused silica; and optionally, up to 15% b.w. of styrene-rubber or styrene-rubber-styrene block copolymer, or semiliquid rubber.
摘要:
An insulating oil containing N,N-bis(2-hydroxyethyl)-N-cyclohexylamine at 0.5 mg/l or more. An electrical apparatus is filled with the insulating oil in which a copper component is immersed. During operation of the apparatus for a long period of time, the tan .delta. of the insulating oil does not increase so that deterioration of the insulating oil is deferred, thereby substantially extending the life of the insulating oil.
摘要:
An improved electrical insulating oil which is stable in refining treatment and good electrical properties are maintained under high temperature conditions, and oil-filled electrical appliances impregnated therewith. The electrical insulating oil comprises 1,1,-diarylalkenes which are represented by the following general formula (I): ##STR1## wherein R.sub.1 to R.sub.4 's are the same or different and each of them is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and m and n are integers from 0 to 3, inclusive.
摘要:
A coil wire has a lubricant film formed on an outer surface of an insulation film covering a conductor. The lubricant film is made of polypropylene glycol or a material obtained by substituting a hydrogen atom at at least one end of polypropylene glycol with another reactive group so as to provide a coil wire wherein generation of organic gases can be suppressed.