The utility model relates to a power transformer low partial discharge full vacuum structure, in which three iron cores are arranged in the oil tank, the outer circumference of the iron core is provided with a paper cylinder, and the high-voltage coil and the low-voltage coil are respectively wound up and down outside the paper cylinder, and the insulation is wrapped through the insulation ring, and between the paper cylinder and the high-voltage coil and the low-voltage coil, there are several brace supports which are consistent with the axis direction of the iron core; wherein, the oil The top cover of the tank is equipped with a butterfly valve for vacuumizing. The sealed oil tank is vacuumized through the butterfly valve. The residual pressure in the oil tank is \u2264 133pa. The structure makes the incoming line voltage half of the original, greatly reduces the distribution of impulse voltage, and also reduces the interlayer voltage; the built-in brace reduces the bubble retention in the oil tank, so as to ensure the full vacuum state of the oil tank, and the partial discharge value of the transformer is less than 100 PC.
【技术实现步骤摘要】
电力变压器低局放全真空结构
本技术涉及一种电力变压器低局放全真空结构,属于变压器
技术介绍
现今,小容量(630kva)66千伏(高压线圈)变压器,一般都有局部小于100PC的硬性要求。此类变压器一般存在如下几个缺陷导致局放达不到要求:①由于容量较小,铁心直径就较小,曲率就较大,易形成尖角,就会使变压器油分解机会增大;②高压侧电压相对较高,线圈匝数就较多,线圈分层也较多,因此不利于三热且易形成死角,存留气体;③此类变压器属配电变压器,相关国家标准对没有硬性要求,在变压器壳体设计时,正压强度都不是按抽全真空设计,当变压器制造好后,不能进行抽全真空注油,使变压器器身内残留空气,导致局放高。
技术实现思路
本技术要解决的技术问题是提供一种电力变压器低局放全真空结构,该结构使进线电压为原来的一半,大大降低了冲击电压分布,同时也降低了层间电压;内置撑条,减少油箱内的气泡存留,从而保证油箱的全真空状态,使变压器局部放电值达到小于100PC的要求。为解决以上问题,本技术的具体技术方案如下:一种电力变压 ...
【技术保护点】
1.一种电力变压器低局放全真空结构,其特征在于:在油箱(1)内设置三项的铁心(2),铁心(2)的外圆周设置纸筒(5),纸筒(5)外上下分别缠绕高压线圈(3)和低压线圈(4),并通过绝缘圈(8)包裹绝缘,纸筒(5)与高压线圈(3)和低压线圈(4)之间圆周分布若干个与铁心(2)轴线方向一致的撑条(6)支撑;其中,油箱(1)上盖设有抽真空的蝶阀(7),密封的油箱(1)通过蝶阀(7)抽全真空,油箱内残压≤133Pa。/n
【技术特征摘要】
1.一种电力变压器低局放全真空结构,其特征在于:在油箱(1)内设置三项的铁心(2),铁心(2)的外圆周设置纸筒(5),纸筒(5)外上下分别缠绕高压线圈(3)和低压线圈(4),并通过绝缘圈(8)包裹绝缘,纸筒(5)与高压线圈(3)和低压线圈(4)之间圆周分布若干个与铁心(2)轴线方向一致的撑条(6)支撑;其中,油箱(1)上盖设有抽真空的蝶阀(7),密封的油箱(1)通过蝶阀(7)抽全真空,油箱内残压≤133Pa。
2.如权利要求1所述的电力...
【专利技术属性】
技术研发人员:刘晓礌,
申请(专利权)人:沈阳华美变压器制造有限公司,
类型:新型
国别省市:辽宁;21
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