渭南变压器负载试验

渭南变压器负载试验
概述
    负载试验的目的是测量负载损耗和阻抗电压。
    负载损耗由几部分组成：
    (1)直流电阻损耗绕组中的直流电阻损耗I²R，这是负载损耗中的要部分。
    (2)附加损耗，因绕组电流产生的漏磁场引起的损耗，其中包括：
    1)导线内的涡流损耗。
    2)并联导线内的不平衡电流损耗。
    3)铁心内引起的涡流损耗及漏磁场使铁心内磁通分布不均而增加的损耗。
    4）漏磁场在油箱、油箱屏蔽板内引起的损耗。
    5)漏磁场在夹件、拉板等结构件内的损耗。
    负载试验接线试验从电源和测量线路来看，和渭南变压器空载试验一样，不同的仅是非电源侧的绕组人为短接，从电源侧绕组在额定分接下供给额定频率的领定电流，为了安全和方便，空载试验一般从侧供电，而负载试验一般从侧供电。若电源是正弦波形，渭南变压器短路状态下的电压和电流都是正弦波形的。因此。可以不必考虑波形畸变对于测量的影晌。对于制造厂，每台都需做负级试验，但对供电部门的修试车间，小于3150kVA的渭南变压器一般可不做负载试验。
    负载试验是在额定分接位置一次二次绕组都产生额定电流状态。此时，一次侧施加的电压即为阻抗电压，渭南变压器所吸取的功率即为负载损耗。
 
Load test
 
Outline
    The load test is a measure of the load loss and impedance voltage.
    The load loss consists of several parts:
    (1) DC resistance loss of winding DC resistance loss the I ² R, which is the main part of the load loss.
    (2) additional loss, the loss caused by the leakage magnetic field generated due to the winding current, including:
    1) wire within the eddy current loss.
    2) parallel wire unbalanced current loss.
    3) loss of eddy current loss caused by the leakage magnetic field in the core within the core flux distribution within the uneven increase.
    4) The leakage magnetic field caused by the loss in the fuel tank, fuel tank shield plate.
    5) The leakage magnetic field losses in the clip, pull the board structure.
    Load test connection test from the power supply and measuring circuit of view, and the transformer no-load test, the only non-power side of the winding man-made short points to take over from the power winding at rated current supply of rated frequency of the collar, for safety and convenient, no-load test is generally from the low voltage side of power supply, load test of the general power supply from the high pressure side. If the power is a sine wave voltage and current of the transformer short-circuit state sinusoidal waveform. Therefore. Do not have to take into account the shadow of the waveform distortion measurement noon. For the factory, each to be done to a negative level test, but less than a 3150kVA the transformer generally do not do load test on the electricity sector repair test.
    The load test is a secondary winding rated tap position to produce the rated current state. At this point, the power drawn by the primary side of the applied voltage is the impedance voltage transformer is the load loss.