电子测试
電子測試
전자측시
ELECTRONIC TEST
2013年
7期
269-271
,共3页
计算机房%非线性负载%电流导通角%零地电压
計算機房%非線性負載%電流導通角%零地電壓
계산궤방%비선성부재%전류도통각%령지전압
computer real%nonlinear load current%conduction angle of zero to earth%voltage
通过分析线性负载与非线性负载的电流波形差异并模拟三相供电计算机房的工作状态,用示波器观察零线、相线的电压与电流波形及相位关系,结果表明:电流有效值相等的微机与纯电阻负载相比,电流峰值是线性负载的2.12倍,电流导通角仅40°左右,三相电流在时间轴上没有重叠部分,零线电流为三相电流之和,零地电压等于三相电流有效值之和与零线电阻的乘积.提出了增大供电线路截面积为降低零地电压、改善供电质量的最有效办法,相线宜增大到线性负载时的2倍以上,零线增大到6倍以上.
通過分析線性負載與非線性負載的電流波形差異併模擬三相供電計算機房的工作狀態,用示波器觀察零線、相線的電壓與電流波形及相位關繫,結果錶明:電流有效值相等的微機與純電阻負載相比,電流峰值是線性負載的2.12倍,電流導通角僅40°左右,三相電流在時間軸上沒有重疊部分,零線電流為三相電流之和,零地電壓等于三相電流有效值之和與零線電阻的乘積.提齣瞭增大供電線路截麵積為降低零地電壓、改善供電質量的最有效辦法,相線宜增大到線性負載時的2倍以上,零線增大到6倍以上.
통과분석선성부재여비선성부재적전류파형차이병모의삼상공전계산궤방적공작상태,용시파기관찰령선、상선적전압여전류파형급상위관계,결과표명:전류유효치상등적미궤여순전조부재상비,전류봉치시선성부재적2.12배,전류도통각부40°좌우,삼상전류재시간축상몰유중첩부분,령선전류위삼상전류지화,령지전압등우삼상전류유효치지화여령선전조적승적.제출료증대공전선로절면적위강저령지전압、개선공전질량적최유효판법,상선의증대도선성부재시적2배이상,령선증대도6배이상.
Through the analysis of linear load current waveform difference and nonlinear load and Simulation of three-phase power supply of computer real work state,using the oscilloscope observation zero line, phase line voltage and current waveform and phase relationship,results show that :the current effective value equal to the microcomputer and the pure resistive load,peak current is 2.12 times the linear load, current the conduction angle of about 40 °,three-phase current no overlap in time axis,the zero line current of three-phase current and voltage,zero is equal to the effective value of the three-phase current and resistance and the zero line of the product.The increase of power lines cross-sectional area to reduce the effective way to zero voltage,improve the quality of power supply,line should be increased to a linear load more than 2 times,the zero line is increased to more than 6 times.
