零线电流过大怎么办

HJLS型低压零序滤波器

零线电流过大怎么办

应用场合1.   Applicable Condition   目前已大量应用于：LED显示屏、广告牌、LED路灯、景观照明、电池化成检测系统、电源生产老化系统、商场、体育馆、舞台、大型商业综合体等场所行业。Currently zero current eliminator could be used to eliminate over flow of current of zero line for LED display screen, advertising board, LED street lamp, landscape lighting, battery formatting inspection system, manufacturing and aging system of power, emporium, stadium, stage and large-scale complex etc.

常见造成零线电流过大的电子设备1.   Electrical Equipments Which Often Encounter Zero Current Over Flowl        各种开关电源设备（计算机、电视机、显示器等）；l        Various switching power equipment(computer, television, display screen etc)l        变频器的大量应用（变频空调、电机节能等）；l        Equipment with mass frequency converter (inverter air conditioner, energy saving motor etc.)l        各种新光源（LED灯、节能灯、荧光灯等）；l        Various new illuminants (LED lamp, energy saving lamp, fluorescent lamp etc.)l        办公设备（复印机、传真机等）；l        Office equipments( duplicating machine, fax machine etc.)l        家用电器（洗衣机、显示屏、微波炉等）；l        Household appliances (washing machine, display screen, micro-oven etc.)l        电子设备（手机充电器等整流设备）l        electronic equipments (rectifying appliances such as phone charger etc)

零线电流产生的原因1.   The cause of zero line current occuring根据国家标准GB17625.1-2003《电磁兼容  限值  谐波电流发射限值（设备每相输入电流≤16A）》限值要求，对以上设备谐波限值很低，造就产品3次谐波含量很大，由于3次谐波矢量方向角度一致，使用寿命次谐波向零线叠加，造成零线电流过大，。单体功率极少，单体而言，造成的危害可以忽略不计，但当相当多的单体一起使用时，零线电流大得惊人（严重时超过相线电流的两倍）According to limit value stipulated by national standard GB17625.1-2003 “Electromagnetic compatibility--Limits--Limits for harmonic current emissions(equipment input current≤16A per phase)”, the harmonic current limit value regulated for above equipment stated under item 3 is very low, it makes the 3rd order harmonic current capacity large, also because the 3rd order harmonic current is consistent in vector, direction and angle, the working life of sub harmonic current overlay to zero line, these makes the current of zero line over flow. Power capacity of single equipment is low and we could ignore its damage, but when a great amount of equipments are used at the same time, current of zero line will be great (it will be more than twice of the phase line in serious situation).

谐波的危害1.   Harm Of Harmonic Currentl        正常情况下，零线线径为相线的1/3或1/2，而实际电流情况是零线电流高于相线电流的情况越来越多，使零线过载严重、发热严重，老化迅速，很容易由于短路造成火灾等一系列人身安全隐患；l        Normally the wire diameter of zero line is 1/3 or 1/2 of the phase line, in fact it becomes common that current of zero line is higher than phase line, these makes the zero line over load, serious heat and rapid aging, under such condition, fire and other safety loophole will be easily caused by short circuit.l        由于零线电流过大，使变压器零序保护动作经常跳闸。l        Because the current of zero line over flow greatly, consequently the zero-sequence protection of transformer starts and trips frequently.l        增加用电量，零线电流过大，零线发热消耗能量，谐波也会消耗能量l        The electricity consumption increase. Because the zero line over flow greatly, the zero line heat and consume energy and accordingly the harmonic current consume energy.l        补偿功率因数的电容器过热，易损坏，寿命短，造成功率因数降低；l        The capacitor used to compensate power factor is overheating, under such condition, the capacitor is easy to be damaged and work shortly, and consequently the power factor decrease.l        造成开关及误动作、失灵；设备精度下降、稳定性下降；l        It will lead to switch malfunction and out of work, consequently the accuracy and stability of equipment decreases.

零线电流消除器带来什么好处1.   Advantage Of Zero Current Eliminatorl      能锐减零线电流90%以上，避免电缆电线过热，节能10%以上；l      It could decrease more than 90% of the current in zero line, and save more than 10% of energy by avoiding cable or wire overheat.l      避免零线电缆由于过电流导致的短路引起电气火灾；l      It could avoid fire caused by short circuit while current over flow in zero line.l      避免中性线零位飘移，使中性线对地没电压，对设备及人身安全造成隐患；l      It could avoid zero position of neutral line drifting. If the zero position of neutral line slips, there will be no voltage between neutral line and ground, and these will cause safety loophole to equipment and human being.l      避免谐波对精密设备的干扰（如计算机死机），产生不必要的损失；l      It could avoid harmonic current to disturb the precision equipment and stop causing unnecessary cost(such as computer system halted)l      避免由三次谐波对三相异步电动机产生紧箍作用，使烧坏电动机；·                                 The 3rd order harmonic current may make locking effect to triphase asynchronous motor and burn the motor. It could avoid such damage.l      避免零序保护误动作，消除由于误动作造成的经济损失；l      It could avoid malfunction of zero-sequence protection, and eliminate the cost caused by malfunction.

零线电流消除器产品特点1.   Product Feature Of Zero Current Eliminatorl      全自动、运行稳定、无需维护；l      Full-automatic, stable operate and no need to maintainl      使用寿命长达二十年；l      Working life is over 20 yearsl      只滤除谐波、不改变原来三相电压、不提高零线电压；l      Only eliminate harmonic current, do not change triphase voltage nor increase zero line voltage

接线方式1.   Wiring connection接线方法：零线消除器串联接法。共七根线，三进三出，零线并接，三相电首先接进零线消除器进线端，出线端/出线接负载，一根零线直接并接到系统零线。Wiring connection: zero current eliminator is connected in series. There are seven wires, three input wire and three output wire, one zero line connected in parallel. The triphase wire should be firstly connected to input terminal of zero current eliminator, the output terminal of zero current eliminator should be connected to loading equipment, and one zero line should be connected directly to zero line of the system.电源进线： Input Wire of Power      电源零线： Zero Line of Power断路器的进线端：Input terminal Of Breaker零序滤波器：Zero Current Eliminator出线端：Output Terminal of Wire        负载设备： Loading Equipment磁性零序滤波器：Magnetic Zero Current Eliminator