Page 24 - 青岛特变电工有限公司

干式变压器系列
Dry-type transformers series
结构特征 / Structure
● 低压箔式线圈
对于低电压、大电流线圈，其短路时的短路应力较大，同时低压匝
数较少，低压电流越大采用线绕型式其安匝不平稳问题越突出，散
热问题也需着重考虑，此时低压采用箔式绕组可较好解决上述问题，
首先箔式产品不存在轴向匝数和轴向绕制螺旋角，高低压绕组安匝
平衡，短路时变压器轴向应力较小，
其次由于其绝缘较薄，工艺上又可容易设置多层风道，散热问题也
较好解决。我厂低压箔式线圈是 STOLLBERG 公司生产的自动箔
式绕线机上自动绕制，
内部焊接在绕线机上采用氩气保护焊接，精度高，焊接电阻小，无
外部焊接过程。绕组层间采用 DMD 绝缘，绕制完毕后端部用树脂
密封固化。
● 高压浇注线圈
主要材料和特性：
线圈采用 F 级绝缘的铜导线作导体，玻璃纤维与环氧树脂复合材料
作绝缘，其膨胀系数与铜导体相近，具有良好的抗冲击、抗温度变化、
抗裂性能。玻璃纤维和环氧树脂所有组成成份都具有自熄性，不会
持续燃烧，也不会产生有毒气体和污染环境。环氧树脂具有良好的
绝缘特性，特别适合制作高电压等级的线圈。
制造工艺：
线圈在高精度绕线机上绕制。绕制时在线圈内外层铺敷玻璃纤维，
变压器容量较大时设计有通风道。线圈绕制完毕后进行真空干燥。
整个浇注及固化过程按照工艺部门通过计算机网络传输至浇注控制
终端的工艺曲线完成。所有过程可在计算机终端随时监视并由计算
机根据情况自动调整。精密的制造过程使线圈无气泡、空穴。
● 温控装置和风冷系统
保 护外壳 和对变 压器作进 一 步的安 全保 护，防 护等级有 IP20
IP23 等，外壳材料有冷轧钢板，不锈钢板、铝合金板等供用户选择。
低压出线用标准母线排出线，侧出线和顶出线均可，也可以 根据用
户的需求设计特殊的出现方式。
● 进线方式示意图
配电变压器可根据不同的接口形式制造常规出线、标准封闭母线
出线和标准侧出线，也可根据用户要求设计特殊出线方式。
13 www.qingdaotebian.com
● Lv fooled winding
For low voltage, high current coil, short circuit stress short-circuit its larger,
while less low pressure turns, the greater the use of low-voltage electric
current ampere-turns wound type whose more prominent issue is not stable,
heat issues also need to focus on to consider, at this time use low-voltage
foil winding can better solve the problem, first of all there is no axial foil
product axially winding turns and a helix angle, high and low voltage winding
ampere-turns balance, axial stress is small transformer short circuit,Second,
because the insulation is thin, the process can be easily set up multi-duct,
cooling problems are better solved. I plant low-voltage foil coils are produced
on STOLLBERG automatic foil winding machine automatic winding,Internal
welding using the winding machine argon arc welding, high precision, small
resistance welding, no external welding process. DMD insulation layer using
inter-winding, winding complete rear end portion sealed with a resin cured.
● Hv casted winding
Class F coil insulated copper wire as conductor, glass fiber and epoxy resin
composite materials for insulation, its coefficient of expansion similar to
the copper conductor, with good impact resistance, temperature changes,
crack resistance. Glass fiber and epoxy resin constituent all have self-
extinguishing, it does not continue to burn, it does not produce toxic gases
and pollute the environment. Epoxy resin has good insulating properties,
particularly suitable for the production of high-voltage coil level.
Manufacturing process：
The windings wound on the high-accuracy winding machine, when
windingpave cast grass fibre around the external and internal of the
windings, there be armed air passage for transformer of large capacity,
Then dry it invacuum.The whole casting and olidifying process is performed
according to the process curve of casting control terminal, which transferred
through computer network by process department, every process can be
monitored momentarily and adjusted for the various surroundings. The
precise process ensures free bubble and free hole of winding.
● Protec shield cover
The shell makes further protection for transformer. For users option, the
grade of protection has IP20、IP23, ect. and the material has sort of cold-
rolled steel plates and stdainless steel plates, ect.
The low-voltage outgoing line can adopt the method of standard bus bar
group outgoing line, outgoing on the transverse side and upper part as well
as the very method that designed by the users.
● Leading-in drawing
Routine lead, standard closed busbar lead type and standard side lead
for the distributiontransformer, with special lead way produced to meet the
customer's demand.