170ADO54050
•每个变压器在油箱底部配备排水兼过滤阀，在油箱底部配备过滤阀
油箱顶部。阀门配有塞子/盲板，以阻止油流出。
•主要提供两种类型的阀门。
i） 车轮阀
ii）蝶阀
•车轮阀与内螺纹或法兰一起使用。这些是炮铜/铸铁类型。
•通常，为2000年之前的变压器提供一个隔离阀，也称为切断阀
储油柜和瓦斯继电器之间的KVA。蝶形铸钢阀门
机加工法兰用于油箱和可拆卸散热器之间的连接点。
4.6衬套
a） 油连通型
•变压器绕组通过终端套管连接到外部电路。这个
套管安装在变压器箱的盖上或侧壁上。的下端
套管伸入油箱，两端配有合适的紧固件以连接
线路引入变压器内部，外部有外部导体。
•套管的形状和尺寸取决于电压等级、电流类型。1000的衬套
电压为两件式结构，无电弧喇叭，而所有其他套管均为单套管
件瓷式。单件式衬套的组装和拆卸无需
干扰活动部件。对于两件式结构的衬套，要求油箱盖
拆下，以便必要时接触衬套的内（下）端。这些衬套不是
运输时分离。
b） 冷凝器衬套
•通常，电容器套管用于72.5 KV及以上。这些衬套包含
并密封以保持相同。当这些衬套安装在衬套上时
提供气穴或凸起的截断部分、排气管，用于排出空气或气体
维修期间，从这些口袋到瓦斯继电器。
•这些套管与变压器分离，并单独发货。他们都打包好了
按照制造商的说明。穿线式导线盘绕并暂时保持在下方
衬套盲板。
•安装衬套所需的设备包括
i） 绳索吊索
ii）直径约2mm的柔性钢丝。，长度合适。

• Every transformer is provided with drain cum filter valve at bottom of the tank, and filter valve at top of the tank. Valves are fitted with plugs/blanking plates to stop oil coming out. • Mainly two types of valves are provided. i) Wheel Valves ii) Butterfly Valves • The Wheel Valves are used either with female screw threads or with flanges. These are of gunmetal/cast iron type. • Generally, one isolating valve also known as shut off valve is provided for transformer up to 2000 KVA between conservator and buchholz relay. The Butterfly type cast-steel valves with the machined flanges are used at points of connection between tank and detachable radiators. 4.6 BUSHINGS a) Oil Communicating Type • Transformers windings are connected to the external circuit through terminal bushings. The bushings are installed on the cover or, on side walls of the transformer tank. The lower ends of the bushing protrude into the tank and at both their ends are provided with suitable fasteners to connect the line leads inside the transformers with an external conductor outside it. • The shape and size of the bushings depend on the voltage class, type of current. Bushings of 1000 Volts are of two-piece construction without arcing horns, whereas all other bushings are of single piece porcelain type. Assembly and dismantling of single piece type bushing is possible without disturbing the active part. For bushings of two-piece constructions, tank cover is required to be removed for necessary access to the inner (lower) end of the bushings. These bushings are not detached at the time of transportation. b) Condenser Bushings • Generally, Condenser Bushings are used for 72.5 KV and above. These bushings contain their own oil and are sealed to retain the same. Whenever these bushings are mounted on bushing pockets or raised truncated portions, air vent pipes are provided for carrying away air or gases from these pockets to Buchholz relay during service. • These bushings are detached from the transformers and despatched separately. They are packed as per manufacturers' instructions. The draw through type lead is coiled and kept temporarily below the bushing blanking plate. • The equipment required for mounting the bushings are i) Rope slings ii) Flexible steel wire approx. 2mm in dia., of suitable length.