| 引用本文: | 梁志瑞,甄旭锋,牛胜锁.大型电力变压器低压侧绕组直流电阻测试新方法[J].电力自动化设备,2007,27(6):27-31 |
| .DC resistance measurement for low voltage side winding of large- scale transformer[J].Electric Power Automation Equipment,2007,27(6):27-31 |
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| 摘要: |
| 介绍了测量大型变压器低压侧绕组直流电阻的几种方法,详述和分析了其测试过程和测量结果,并针对现有测量方法测量低压侧绕组直流电阻时的不足,综合助磁法和全压-恒流电源法,提出了基于这2种方法的一种新方法。在电路强制稳态的基础上,开始加全压(高压)以迅速提高线圈电流,缩短过渡过程,然后用恒流源稳定电流进行测量;助磁法是把高、低压绕组串联起来,通电流测量,由于高压绕组的匝数远比低压绕组匝数多,借助于高压绕组的励磁安匝数,用较小的电流就可使铁芯饱和,从而使绕组电感大为减小,以缩短测试时间,而达到快速测试的目的。 |
| 关键词: 大型变压器,直流电阻,助磁法,绕组,快速测量 |
| DOI： |
| 分类号:TM41 TM934.12 |
| 基金项目: |
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| DC resistance measurement for low voltage side winding of large- scale transformer |
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LIANG Zhi-rui ZHEN Xu-feng NIU Sheng-suo
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| Abstract: |
| Several DC resistance measurements for low voltage side winding of large-scale transformer are introduced,detailed in testing process and measuring results.A new method is proposed to improve present measuring methods,which is based on the full-voltage constant-current source method and the saturable magnetic circuit method.At forced stationary circuit state,full-voltage is used to quickly increase the winding current and shorten the transient process,and constant-current source is then achieved for measuring.With the high and low voltage windings connected in series,because the turns of high-voltage windings are much more than those of low-voltage windings,a small going-through measuring current may make the iron core saturated,which reduces the winding inductance greatly and shortens the testing time. |
| Key words: large-scale transformer,DC resistance,saturable magnetic circuit method,windings,quick measuring |
