In this era is full of electricity, not a few safety measures also I can't trust the power of the bold and the leakage protector is one kind of, also is a kind of household electricity necessary security, and our life is closely linked, so in the published a chapter on leakage protect articles, hope everybody can have a general understanding on this.

Leakage protector, also known as leakage switch, as the name implies, it is a kind of leakage sensitive and action of the switch.Basic cover internal leakage into the leakage detection, signal processing, executive mechanism of three parts, the leakage detection part is a zero sequence current transformer, the phase line and zero line from the circular constitute the primary side of transformer, passing through the middle winding on the circular coil as the secondary side, under normal circumstances, flowed from the phase line current and zero line on the flow back to the electric current is equal, but in the opposite direction, offset each other back and forth, without residual current, naturally, there is no induced voltage in secondary side, when a device or circuit leakage, leakage current will bypass circuit directly to the earth, resulting in current transformer internal imbalance, residual current,In the secondary side, the induction signal is sent to the signal processing circuit. After various processing or comparison, the leakage signal will be sent to the tripping device of the actuator when it exceeds a certain value, and the power will be cut off by the tripping device to protect the safety of electricity consumption.

General household appliances shell are grounded, under normal circumstances the shell is not charged, but if the device fails, the internal circuit and external insulation damage, charged on shell, leakage current passes through the machine shell to the earth, and the leakage protector to detect leakage abortion with will cut off the power switch, avoid personal touch machine shell to get an electric shock accidents.

Somebody can ask, if there is earthing wire in domestic circuit, do not have protective device of leakage current action?I remember someone asked me this question the other day, and I will answer it here.Leakage protector and grounding line is belong to two different kinds of protective measures, family if not ground line, the leakage occurs, electrical equipment enclosure grounding form the leakage current, leakage protector is not action, only the personal touch to the leakage of electric equipment, electric current will flow through the human body to the earth, the formation of leakage current, the leakage will trip, so the grounding or not line, leakage protector can play a role, but lies in human body before and after the shock, understand said, is not grounded, only being people to call will trip.Therefore, for the sake of safety, it is better to use both kinds of protection.

There is also a kind of special situation, personal electric shock is not cause leakage protector action, is when the body touch line and zero line at the same time, and with the earth insulation, leakage protector will not trip, the equivalent of a human body a load at this time, the flow of current in transformer and flow back to the electric current is equal, no residual current, so will not trigger trip action, in this case it is dangerous to get an electric shock, so each friends need to pay attention to, all right, don't literally touch various charged body.