Overview
Medium-sized used transformers typically range from 100 kVA to 2.5 MVA capacity, originating from industrial plants, substations, or utility upgrades. These units enter secondary markets either as scrap for metal recovery or as refurbishable equipment. The global transformer recycling market processes millions of tons annually, driven by copper/steel reclamation and environmental regulations. Decommissioned transformers fall into two categories: those with potential for reconditioning (requiring rewinding and testing) and end-of-life units destined for dismantling. Buyers should distinguish between oil-filled (requiring fluid disposal) and dry-type transformers, as this significantly impacts handling costs.
Structure and Working Principle
A typical medium-sized transformer consists of laminated steel cores (yoke and limbs), copper/aluminum windings (primary and secondary coils), bushings, tap changers, and either mineral oil or air as insulation/cooling medium. The working principle relies on electromagnetic induction between coils. In used units, core damage (short-circuited laminations) and degraded insulation are common issues. Oil-filled transformers may have compromised dielectric strength due to moisture absorption or particulate contamination. Dry-types often exhibit thermal degradation signs in epoxy resin or cellulose insulation.
Key Features
Salvageable components include high-value copper windings (up to 60% weight in some units), steel cores for recycling, and undamaged bushings/accessories. The scrap value primarily depends on the International Copper Study Group's monthly pricing and local recycling infrastructure. Refurbishable units must retain intact magnetic circuits and show insulation resistance >1,000 megohms. Modern units (post-2010) often contain less copper due to aluminum substitution, affecting scrap valuation. Buyers should prioritize units with clear decommissioning dates and maintenance histories.
Application Areas
Functional used transformers serve temporary power needs in construction, mining operations, or as backup during grid maintenance. Non-functional units supply: 1. Metal recovery: Copper for electrical wiring, steel for foundries 2. Component reuse: Bushings, radiators, and control gear for repair shops 3. Artisanal applications: Upcycled into industrial décor or educational displays Export markets in developing countries often purchase refurbished medium transformers for rural electrification projects, subject to IEC 60076 standards compliance.
Maintenance and Precautions
Pre-purchase inspections should include: infrared scans for hotspot history, dissolved gas analysis (DGA) reports for oil units, and core excitation tests. Always verify if Polychlorinated Biphenyls (PCBs) testing was performed – pre-1985 units may require specialized disposal. Storage requirements involve keeping units upright (to prevent oil leakage), protecting bushings from weather, and grounding all terminals. OSHA 1910.269 mandates proper lockout/tagout procedures during handling due to potential capacitive charge retention.
B2B Procurement Guide
Key procurement metrics include: copper content percentage (typically 15-25% by weight), core stacking factor (≥0.95 for good quality), and absence of internal arcing evidence. Always request dismantling manifests confirming proper oil drainage and hazardous waste disposal. Pricing follows commodity markets but includes location factors: urban units cost more to transport due to traffic restrictions, while rural units may have lower contamination. Establish long-term contracts with certified recyclers to stabilize supply amid metal price volatility.
Related Manufacturers
- 主营：中央空调回收、电缆回收、配电柜回收、变压器回收、废旧物资回收、整厂设备回收、工厂设备回收、机械设备回收、电脑回收、灭火器回收、电池回收、发电机回收、厂房拆除公司、钢结构厂房回收、反应釜回收、货架回收、空调回收、制冷设备回收、电力设备回收、充电桩回收、销毁公司、设备回收
- 主营：变压器回收配电柜回收、整厂设备回收厂房拆除、制冷设备回收
- 主营：二手设备回收、配电柜回收、开关柜回收、变压器回收、二手变压器回收、箱式变压器回收、干式变压器回收、油浸式变压器回收、废旧变压器回收、开关箱回收、电缆线回收、配电箱回收、电力设备回收、电力物资回收、废电缆回收、电线电缆回收、中央空调回收、机器人回收、母线槽回收、整厂设备回收、发电机回收、发电机组回收
- 主营：电缆线回收、高压电缆线回收、母线槽回收、干式变压器回收、箱式变压器回收、美式变压器回收、组合式变压器回收、溴化锂机组回收、旧中央空调回收、高低压配电柜回收、柴油发电机回收、二手发电机回收、二手电缆回收、高低压预装式变电站回、冷水机组回收、环网柜回收、开闭所回收
- 主营：充电桩回收、车库回收、冷库回收、变压器回收、废旧物资回收、立体车库回收、防静电地板回收、酒店厨房设备回收、汽化器回收、空调回收、中央空调回收、设备回收、二手设备回收、化工设备回收、酒店拆除回收、整厂设备回收
- 主营：电缆回收、高压电缆回收、电线电缆回收、变压器回收、废旧电缆回收、二手电缆回收、计算机电缆回收、铜芯电缆回收、低压电缆回收、废电缆回收、旧电线电缆回收、铝线回收、钢芯铝绞线回收、平方线回收、电缆线回收、300电缆回收、铝电缆回收、电力电缆回收、矿用电缆回收、整轴电缆回收、全新电缆回收、库存积压电缆回收、光伏电缆回收、光伏板回收、光伏线回收
- 主营：变电站、s11-m-80kva、配电设备、变压器、欧式箱变、青电电气、美式箱变、高低压成套、高低压设备、高低压开关柜
- 主营：矿用洗靴机、皮带硫化机、矿用马丽散封孔袋、矿用干式变压器、爆破聚能管、井下自动隔爆装置、断带抓捕器、矿用缓冲床、矿用无压风门、矿用避难硐室门、负压放水器
- 主营：铜米机、铜塑分离机、涡电流分选机、废旧冰箱分选生产线、马达转子粉碎机、水洗铜米机、600型铜米机、断桥铝分选设备、中空玻璃胶条分选设备、单轴撕碎机、粉碎机、全自动铜米机、小型铜米机、机油滤芯破碎机、榨油机、液压龙门剪、凉皮机、压油机、粉皮机、生铝破碎机、烘干机、干式铜米机、铜线粉碎机、杂线铜米机、机头料撕碎机
- 主营：变压器
- 主营：房屋拆除、哈尔滨废铁、废品回收站、变压器回收、回收废旧线缆、高价回收变压器、电梯回收、电梯拆除、废铁回收
- 主营：电表回收、厂房拆除、黄铜紫铜、废旧金属、废旧钢丝绳、电缆回收、化工厂拆除、电路板回收、铝合金废铝、厂拆除回收、旧设备回收、电力设备回收
- 主营：二极管、三极管、电源管理、变压器、接口芯片、存储器、传感器、微控制器、逻辑器件、MOS管、数据转换芯片、振荡器
- 主营：变压器、传感器
- 主营：齿轮泵、交换机、液位计、变压器、防滑板、光栅尺、转速计、气压缸、高温计、定位器、单向阀、齿轮箱、固定座、助力臂、电源盖、止回阀、编码器、熔断器、继电器、注胶器、控制器、安全阀、恒温器、螺丝刀、电缆夹
- 主营：旧空调、电缆线、废金属、变压器、废旧设备、回收废旧、旧库存、托盘货架、库存纺织、废品设备、仓储货架、广电设备、电气回收、电线收购、电线电缆、二手机床、家用电器、二手空调、空调回收、电梯回收、金属回收、办公设备、回收拆除、锅炉回收、废品回收
- 主营：涂胶机、压盘泵、喷雾阀、变压器、打胶阀、焊锡机、打胶机、灌胶泵、螺杆泵、润滑油、喷射阀、商标机、滴胶机、点胶机、点胶阀、喷涂机、灌胶机、点胶平台、对位平台、运动平台、胶水喷枪、喷洒装置、打胶设备、点胶设备、热熔胶阀、运动系统