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沼气发电机的三相三线和三相四线有什么不同?

   发布于:2020-02-12 10:49

GLUBET格鲁电竞_格鲁电竞官网_格鲁电竞娱乐平台 沼气发电机三相电路中负载的衔接办法有两种:星形衔接和三角形衔接,其中星形衔接的出线方式分为三相三线制和

  沼气发电机三相电路中负载的衔接办法有两种:星形衔接和三角形衔接,其中星形衔接的出线方式分为三相三线制和三相四线制。

  There are two ways of load connection in three-phase circuit of biogas generator: star connection and triangle connection. The way of star connection is divided into three-phase three-wire system and three-phase four-wire system.

  三相三线制是指分别从发电机三相线圈的一端引出三根导线,线圈的另一端衔接在一同但不引出;三相四线制是指分别从发电机三相线圈的一端引出三根导线,线圈的另一端衔接在一同并引出来作为中性线。

  Three-phase three-wire system refers to three wires drawn from one end of the three-phase coil of the generator respectively, and the other end of the coil is connected together but not drawn out; three-phase four-wire system refers to three wires drawn from one end of the three-phase coil of the generator respectively, and the other end of the coil is connected together and drawn out as a neutral line.

  三相三线制的特性:

  The characteristics of three-phase three-wire system:

  当三相负载对称时,各相电流间的相位角为120°,负载中性线中的电流和为零,中性线此时不起作用,所以能够不用接出来,这就是三相三线制电路,适用于纯三相负载电路(只能提供380V供电)。这种方式在工业消费上的应用极为普遍,由于消费上的三相负载(通常所见的是三相电动机)普通都是对称的。

  When the three-phase load is symmetrical, the phase angle between the phases is 120 degrees, the sum of the currents in the load neutral line is zero, and the neutral line does not work at this time, so it can not be connected out. This is the three-phase three-wire circuit, which is suitable for pure three-phase load circuit (only 380V power supply). This method is widely used in industrial consumption, because the three-phase load on consumption (usually seen as three-phase motor) is generally symmetrical.

  三相四线制的特性:

  The characteristics of three-phase four-wire system:

  当负载不对称或者某相断开时,将会在中性线中产生电流,中性线保证了负载电压和发电机电压相等和对称。假如此时没有中性线,将使各相负载电压不相等,从而招致某些电器实践工作电压超越额定电压,这是不允许的。在日常生活中我们接触到的负载如:电灯、电视机、电冰箱、电风扇等家用电器及单相电动机都属于单相负载,当电路中同时有单相负载和三相负载时应该采用三相四线制(可提供380V供电,也可提供220V供电)。

  When the load is asymmetrical or a phase is disconnected, current will be generated in the neutral line, which ensures that the load voltage and generator voltage are equal and symmetrical. If there is no neutral line at this time, the load voltage of each phase will be unequal, which will lead to some electrical appliances operating voltage exceeding the rated voltage, which is not allowed. In our daily life, the loads we come into contact with, such as lamps, TV sets, refrigerators, fans and other household appliances and single-phase motors are all single-phase loads. When there are single-phase loads and three-phase loads in the circuit, we should adopt three-phase four-wire system (which can provide 380V power supply, but also 220 V power supply).

  船舶电网电制普通采用三相三线绝缘系统,其中一个优点是当其中一相线与船体碰触时,不会产生激烈的短路电流,冲击电路系统;另一个优点是能够避免人员触电伤亡。三相三线绝缘系统是发电机中性点不接地,即中性点不与船体相接。假如不当心碰到三相中的一相,由于人是站在船体上的,而船体与供电系统不相通,构不成回路,人体就不会有电流流过,因而不会遭电击。

沼气发电机组

  Three-phase three-wire insulation system is commonly used in ship power grid. One of the advantages is that when one of the three-phase lines touches the hull, it will not produce intense short-circuit current and impact circuit system. The other advantage is that it can avoid casualties caused by electric shock. The three-phase three-wire insulation system is that the neutral point of the generator is not grounded, that is, the neutral point is not connected with the hull. If one of the three phases is not carefully touched, because the human body is standing on the hull, and the hull is not connected with the power supply system, the human body will not have current flowing through, so it will not be shocked.

  但是很多船上人员反映在船上受过电击,这是由于当船舶电气系统的绝缘维护不好时,就是常说的对地绝缘降落或绝缘为0时,中性点和船体之间相当于接了一个电阻,以至相当于短路,此时船体就成为陆地系统(三相四线制)的中性线,完整同等于陆地系统,假如这时去碰触相线,就会触电了。因而,三相三线制的设备对绝缘处置的请求比三相四线制的要高。康富电机消费的三相三线制发电机采用高规范的绝缘资料及真空压力浸漆工艺,能够很好的到达船舶发电机对绝缘性能的请求。

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