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柴油發電機組為什么要接地

來源:http://dgxcbw.comD88尊龙   發布于:2017-03-06

  柴油發電機組使用過程中,為了確保人身安全和電力系統穩定,柴油發電機組廠家山東辰龍新能源有限公司柴油發電機接地有嚴格的要求。其接地方式有工作接地、保護接地和保護接零三種,接地的目的如下:

  The use of diesel generators in the process, in order to ensure the safety and stability of power system, diesel generator manufacturers Shandong Chenlong new energy limited diesel generator grounding has strict requirements. There are 03 kinds of grounding modes: working grounding, protective earthing and protective earthing:

  一、工作接地,工作接地是將中性點接地,其目的是:

  First, the work grounding, the grounding is the neutral grounding:

D88尊龙  1、降低觸電電壓。柴油發電機組對于中性點不接地的系統,當一相接地而人體觸及另外兩相之一時,觸電電壓為相電壓的1.7倍以上;而對于中性點接地系統,觸電電壓就降到接近或等于相電壓。

D88尊龙  1, reduce the shock voltage. Diesel generator for neutral point ungrounded system, when a human is also a touch of two-phase voltage, electric shock phase voltage of more than 1.7 times; and for the neutral grounding system, electric voltage drop to close or equal to the phase voltage.

  2、迅速切斷故障設備。對于中性點不接地的系統,當一相接地時,由于導線和地面存在電容和絕緣電阻,可以構成電流通路,接地電流很小,不足以使保護裝置動作而切斷電源,不能確保人身安全。而對于中性點接地的系統,當一相接地后接地電流較大,保護裝置會迅速動作,斷開故障點。

D88尊龙  2, quickly cut off the fault equipment. For the neutral point ungrounded system, when a ground, because the wire and ground capacitance and insulation resistance, can form a current path, the grounding current is very small, not enough to make the protection device and the power supply is cut off, can not ensure personal safety. As for the neutral grounding system, when the grounding current is larger, the protection device will act quickly, and the fault point will be disconnected.

D88尊龙  3、降低電氣設備對地的絕緣水平。在中性點不接地的系統中,當一相接地時,將會使另兩相得對地電壓升高到線電壓。而對于中性點接地的系統,當一相接地時,另兩相的對地電壓只接近于相電壓,故可降低電氣設備和輸電線路的絕緣水平。

D88尊龙  3, reduce the insulation level of electrical equipment to the ground. In a neutral ungrounded system, when the ground is connected, the voltage of the other two phases will rise to the line voltage. For the neutral grounding system, when one phase ground, the other two phase to ground voltage is close to the phase voltage, it can reduce the insulation level of electrical equipment and transmission lines.

  二、保護接地

D88尊龙  Two, protection grounding

D88尊龙  柴油發電機組保護接地常用于中性點不接地的低壓系統中,它的作用是:當電動機某一繞組的絕緣結構已破壞使外殼帶電時,如果未接地,人體觸及外殼,相當于單相觸電,就可能發生觸電的危險。而如果采用了保護接地,人體觸及外殼時,由于人體的電阻與接地電阻并聯,由于人體電阻;遠大于接地電阻,通過人體的電流就很小,就不會發生觸電的危險。

D88尊龙  Diesel generator grounding protection of low voltage system used in neutral ungrounded, its function is: when the motor insulation structure of a winding has damaged the charged case, if not, the body touches the shell, the equivalent single-phase electric shock may occur, the risk of electric shock. And if the use of protective earthing, human touch shell, because the body's resistance and grounding resistance in parallel, because the body is far greater than the resistance; grounding resistance, the current through the human body is very small, the risk of electric shock will not happen.

  三、保護接零

D88尊龙  Three, the protection of zero

D88尊龙  保護接零常用于中性點接地的低壓系統中,它的作用是:當電動機某一繞組的絕緣結構已破壞而與外殼相接時,由于采用保護接零,就形成單相短路,迅速將這一相中的熔絲熔斷,外殼便不再帶電。即使在熔絲熔斷前人體觸及外殼時,也由于人體電阻遠大于線路電阻,通過人體的電流也很微小,不會發生觸電危險。

D88尊龙  Zero protection is often used in low voltage system neutral grounding, its function is: when the motor insulation structure of a winding has been destroyed and connected with the shell, with zero protection, the formation of single phase short circuit, will quickly fuse this phase, the shell will no longer take power. Even in the fuse before the human body touches the shell, because the body's resistance is far greater than the line resistance, the current through the human body is very small, no electric shock risk.

  柴油發電機組的安全正確操作使用,是用戶必須要遵循的原則,希望以上的介紹能給用戶帶來借鑒意義。

D88尊龙  The safe and proper operation and use of diesel generator set is the principle that the user must follow, and hope that the above introduction can bring the significance to the user.


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