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柴油发电机组为什么要接地

来源:http://www.huannengpower.com   发布于:2017-03-06

  柴油发电机组使用过程中,为了确保人身安全和电力系统稳定,柴油发电机组厂家山东辰龙新能源有限公司柴油发电机接地有严格的要求。其接地方式有工作接地、保护接地和保护接零三种,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,工作接地是将中性点接地,其目的是:

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

  1、降低触电电压。柴油发电机组对于中性点不接地的系统,当一相接地而人体触及另外两相之一时,触电电压为相电压的1.7倍以上;而对于中性点接地系统,触电电压就降到接近或等于相电压。

  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、迅速切断故障设备。对于中性点不接地的系统,当一相接地时,由于导线和地面存在电容和绝缘电阻,可以构成电流通路,接地电流很小,不足以使保护装置动作而切断电源,不能确保人身安全。而对于中性点接地的系统,当一相接地后接地电流较大,保护装置会迅速动作,断开故障点。

  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.

  3、降低电气设备对地的绝缘水平。在中性点不接地的系统中,当一相接地时,将会使另两相得对地电压升高到线电压。而对于中性点接地的系统,当一相接地时,另两相的对地电压只接近于相电压,故可降低电气设备和输电线路的绝缘水平。

  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、保护接地

  Two, protection grounding

  柴油发电机组保护接地常用于中性点不接地的低压系统中,它的作用是:当电动机某一绕组的绝缘结构已破坏使外壳带电时,如果未接地,人体触及外壳,相当于单相触电,就可能发生触电的危险。而如果采用了保护接地,人体触及外壳时,由于人体的电阻与接地电阻并联,由于人体电阻;远大于接地电阻,通过人体的电流就很小,就不会发生触电的危险。

  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、保护接零

  Three, the protection of zero

  保护接零常用于中性点接地的低压系统中,它的作用是:当电动机某一绕组的绝缘结构已破坏而与外壳相接时,由于采用保护接零,就形成单相短路,迅速将这一相中的熔丝熔断,外壳便不再带电。即使在熔丝熔断前人体触及外壳时,也由于人体电阻远大于线路电阻,通过人体的电流也很微小,不会发生触电危险。

  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.

  柴油发电机组的安全正确操作使用,是用户必须要遵循的原则,希望以上的介绍能给用户带来借鉴意义。

  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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