GB 5959.5-2014Safety in electroheat installations-Part 5: Particular requirements for plasma installations (English PDF)

4.1.2 Circuit See Chapter 6 GB 5959.1-2005. In addition, GB 5959.1-2005

6.4.1 applies to the entire device.

4.1.3 DC arc power supply The following requirements apply to the specific system of a DC arc power supply.

4.1.3.1 Power Ground DC arc power supply side of a pole (positive or negative, depending on the polarity of the torch), the system shall be used independently of the main ground wire grounding wire grounding, To avoid possible leakage current flows to the circuit, for example as a torch control circuit.

4.1.3.2 Power connection with torch When the torch is disconnected, the DC cables should be grounded through the grounding switch, in order to safely operate the torch. Before the arc ignition should be required operating procedures, can be manually locking/unlocking means to achieve (usually operated by security key) and to special Do not confirm the main circuit breaker is on line and the grounding switch has been disconnected. In addition, the operator can use the key to start the ignition eventually remove the program. This program It should comply with regulations of the country of installation.

4.1.4 torch sockets, plugs and connection cables See Chapter 8 GB 5959.1-2005.

4.1.5 torch Any design arc plasma torch has the following salient features. high-temperature gas, high pressure (usually) and liquid cooling (usually water). Therefore, for safe operation, the torch design and structure should meet the following criteria.

a) Electrical Characteristics.

--- Design between parts of the same voltage in the operation should be fixed electrical connections, including electrode holders, and ground components, To prevent overheating;

--- High voltage torch, if the leakage current flowing through the torch body exceeds 10mA, the torch should be automatically shut down;

--- Between different voltage components (especially between the electrodes) should be fixed electrical insulation, so that under normal operating conditions do not Unexpected electrical breakdown occurs.

b) cooling liquid characteristics.

--- Resistivity coolant of the cooling circuit and the torch design make different voltages member running between the electrodes in particular Maintain insulation required;

--- If the electrode breakage (accidents or normal wear and tear) appears, first electrode material through the design and/or electrodes, followed by Using the electrode detection signal to turn off the torch, so this phenomenon under control.

4.1.6 cooling circuit The following specific requirements for cooling equipment.

4.2 induction plasma system

4.2.2 Circuit See Chapter 6 GB 5959.1-2005. In addition, GB 5959.1-2005

6.4.1 applies to the entire device.

4.2.3 Power

4.2.3.1 Power Ground Supply should be independent of the main system grounding wire grounding wire to ground, to avoid possible leakage path, as indicated by the control circuit formed by the torch path.

4.2.3.2 Power connection with torch You should consider the following requirements.

a) Actions should be enclosed in a Faraday cage to reduce electromagnetic radiation and prevent operator access high-voltage terminals. If the torch cover is opened, Interlocking signals should cut off the pressure;

b) high-voltage terminal should be grounded to the housing when released when the torch or Faraday cage open or shut off the RF generator may be stored in a capacitor Where the residual charge (see

6.2.4 in GB 5959.1-2005).

4.2.4 torch sockets, plugs and connection cables You should consider the following requirements.

--- Between electrical terminal leads and between them and the ground terminal should have sufficient distance to prevent arcing;

--- To use water-cooled conductor,

6.6 GB 5959.1-2005 is applicable;

--- Avoid conductor tensile stress and small bending radius.

4.2.5 torch High-temperature gas, high pressure (usually) and liquid cooling (generally. the design of any induction plasma torch has the following salient features Water). Therefore, for safe operation, the torch design and structure should meet the following criteria.

a) Electrical Characteristics.

--- Designed for the voltage between the same parts in the operation of the electrical connection should be fixed;

--- Torch in structure or ferromagnetic metal should not be used within a Faraday cage;