K coefficient, transformer

“K coefficient” means that the safety isolation transformer can bear different degrees of nonlinear load without exceeding the rated temperature rise limit. Standard specifications are K-4 isolation transformer, K13 safety isolation transformer, K20 isolation transformer, K30 isolation transformer. K13 isolating transformer is a common rated value of office load and common machine room load, the K20 isolation transformer tends to be dedicated computer load (IT data center, Precision Air conditioning and precision motor) and power quality sensitive equipment PDU (power distribution unit)
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  • Product Description
  • Product parameters

    Many electrical devices operate with a switching mode power supply. These on-off mode power supplies are essentially nonlinear and, unlike linear loads that continuously use current from the power supply on a sinusoidal cycle, nonlinear loads draw current from the power supply in the form of pulses, the resulting harmonic distortion. These harmonic currents can cause serious power system problems, such as:

    1. The fuses of circuit breakers and fuses are far below the rated current of 2.5% .

    2. The neutral points in transformers and switchboards are 3.5% hotter than their ratings.

    3. The distribution transformer will overheat even if it runs well within the specified nameplate rating range.


    Product details advantage

    1. The terminal adopts high quality terminal or copper bar, which has high temperature resistance, high pressure resistance and convenient operation.

    2. The windings are made of class H enameled copper or aluminum wire with temperature resistance of 180 ° C and withstanding 5000V voltage.

    3. New cold-rolled silicon steel core, good magnetic flux, low noise, low iron loss, more energy-saving;

    4. The transformer is vacuum impregnated with 180 ° C insulating varnish, and the oven is dried at high temperature, which effectively reduces the vibration and noise in operation, increases the electric strength, prevents corrosion and prolongs the service life.


    Isolation Transformer characteristics

    1. Suppression of harmonic interference;

    2. Increase the system impedance, so that the protection device is easy to fit;

    3. Reduce the impact on system voltage when starting heavy-duty equipment.

    4. When isolated transformer load side occurs single-phase earthing, will not cause the whole system single-phase earthing;

    5. When a short-circuit accident occurs on the load side, the short-circuit current of the system is limited.


    This series of single-phase transformer products are widely used in CNC machine tools and mechanical equipment, new energy generation and energy storage, industrial power, railways, airports, schools and other places.

  • 技术参数
    产品型号 LLSG / SG
    额定容量 0.1KVA ~ 2500KVA (可定制)
    输入电压 1V~10000V (可定制)
    输出电压 1V~10000V (可定制)
    相数 三相
    频率 50Hz / 60Hz 
    绝缘等级 F级/ H级 (可选)
    连接方式 Dyn11,Yyn0,Y/Yd11,Y/Yn0(可选)
    绕组线材 H级 漆包铝线 或 铜线 (可选)
    绝缘方式 H级绝缘漆真空浸漆
    耐压测试 初级对次级2.5KV/1分钟
    绝缘电阻 初级对次级2500V大于100兆欧
    感应耐压 2倍频率/ 2倍电压 /1分钟
    接地电阻 25A<80毫欧
    温升 F级≤100K;H级≤125K
    阻抗电压 约4%
    变    比 <3%
    冷却方式 自冷或风冷
    防护等级 IP20,IP23,IP45,IP54,IP65 (可定制)
    噪   音 ≤35-65dB (1米内)    
    工作效率 ≥98%            
    环境温度 -25℃~+40℃
    海拔高度 ﹤2000M

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