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Technology
Selection principle of leakage circuit breaker
DateTime:2015-10-23

  1 select the location of the use of the use of electrical equipment and electrical equipment

  Electric leakage circuit breaker is used to prevent electric shock, which should be chosen according to the different requirements of direct contact and indirect contact with two kinds of electric shock protection.

  1) protection against electric shock

  Because of direct contact with electric shock is relatively large, causing serious consequences, so we should choose the high sensitivity of leakage circuit breaker, electric tools, mobile electrical equipment and temporary line, should be in the loop to install the action current is 30mA, action time in the 0.1s within the leakage circuit breaker. For household appliances more residential, preferably in the household electrical energy meter. If the electric shock is easy to cause two damage (such as aerial work), should be in the loop to install the action current is 15mA, action time in the US within the leakage circuit breaker. For electrical medical equipment in the hospital, the action current is 6mA, and the action time of the leakage circuit breaker in the US.

  2) indirect contact electric shock protection

  Electric shock in different places can cause different degrees of damage to human body, so the different places should be installed with different leakage circuit breaker. A relatively high risk of leakage circuit breaker with high sensitivity is required for easy electric shock. The risk of electric shock in wet places is much greater than in dry place, the general should be installed action current is 15-30mA, the action time in 0.1s within the leakage circuit breaker. For electrical equipment in the water, the action should be installed. The current is 6-L0mA, the action time in the US within the leakage circuit breaker. For the operator to stand on the metal objects or electrical equipment, as long as the voltage is higher than 24V, the action current should be installed below 15mA, the action time in US within the leakage circuit breaker. For the voltage of 220V or 380V of the fixed electrical equipment, when the case of the housing is below 500fZ, the single machine can be installed action current is 30mA, operation time in 0.19 of the leakage circuit breaker. The electric current of the 100A is 50--100mA, and the leakage current of the electric equipment can be installed with the electric current of the 200-500mA.

Keywords:Active power filter,Active filter, Power quality,Harmonic control,APF
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