The characteristics of welding and cutting electricity are high voltage, exceeding the safety voltage, and protective measures must be taken to ensure safety.
The domestic welding machine no-load voltage is generally about 50 ~ 90V, the plasma cutting power supply voltage is 300 ~ 450V, the hydrogen atom welding voltage is 300V, the electron beam welding machine voltage is as high as 80 ~ 150kV, the input voltage of the domestic motor is 220 ~ 380v. Power frequency AC at 50 Hz, which greatly exceeds the safe voltage.
There are two kinds of electric shock accidents during welding. One is direct electric shock, that is, the electric shock that comes into contact with the normal operation of the electric welding equipment or the electric shock accident near the high-voltage power grid and electrical equipment. The second is the indirect electric shock, that is, the accidental electrification occurs. Electric shock. An accidental electrified body is a conductor that is normally charged without electricity and is charged due to insulation damage or malfunction of electrical equipment.
(1) Causes of direct electric shock accidents during welding (1) A part of the hand or body comes into contact with the live part of the welding electrode or the welding tongs, and the foot or other parts of the body are not insulated from the ground, especially in the metal container. This kind of electric shock is prone to occur when there is a lot of sweat in a rainy or humid place or when there is a lot of sweat on the body.
(2) When wiring or adjusting the welding equipment, a part of the hand or body touches the charged body such as the binding post and the pole plate and is electrically shocked.
(3) An electric shock accident caused by touching or approaching the high voltage power grid when climbing the welding.
(2) Reasons for the occurrence of electrical contact accidents during welding (1) The electric welding equipment leaks electricity, and the human body touches the charged casing and is electrically shocked. Common causes of electric leakage of electric welders are insulation damage due to moisture, long-term overload operation or short-circuit heating, which causes insulation damage. The location and method of electric welder installation do not meet safety requirements.
(2) Insulation damage between the primary winding and the secondary winding of the electric welding transformer, the wiring of the transformer is connected incorrectly, the second winding is connected to the power grid, or the transformer of 220V is connected to the 380V power supply, and the hand or part of the body touches Secondary circuit or bare conductor.
(3) Touch the cable with insulation damage, bakelite lock, broken switch, etc.
(4) Electric shock occurs due to the use of the metal structure of the plant, pipes, rails, crane hooks or other metal objects as a welding circuit.
Residual Current Circuit Breaker With Over Load Protection
TWO FUNCTION : MCB AND RCCB FUNCTIONS
leakage breaker is suitable for the leakage protection of the line of AC 50/60Hz, rated voltage single phase 240V, rated current up to 63A. When there is human electricity shock or if the leakage current of the line exceeds the prescribed value, it will automatically cut off the power within 0.1s to protect human safety and prevent the accident due to the current leakage.
leakage breaker can protect against overload and short-circuit. It can be used to protect the line from being overloaded and short-circuited as wellas infrequent changeover of the line in normal situation. It complies with standard of IEC/EN61009-1 and GB16917.1.
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