Harmonics in the power system come from electrical equipment, that is, from power generation equipment and electrical equipment. 

As an advanced heating method, induction heating has the following advantages over traditional heating methods

Heat in a resistance furnace. The metal is installed into the furnace, the current flows through the heating element to generate heat, and the temperature of the furnace is increased by radiation and convection, so as to heat the metal.

Fault phenomenon: after the equipment is started, when the power rises to a certain value, the equipment is prone to overcurrent protection action, sometimes burning out the thyristor components and restarting, and the phenomenon remains the same.

Fault phenomenon: it can be started, but it stops immediately after starting, and the equipment is in the state of repeated starting.

Fault phenomenon: it is difficult to start. After starting, the intermediate frequency voltage is more than twice the DC voltage, and the DC current is too large.

Fault phenomenon: it is difficult to start. After starting, the intermediate frequency voltage is more than twice the DC voltage, and the DC current is too large.

1. The current I flowing through the inductor in the series inverter circuit is close to the active current, so I is very small, and the electrical loss caused by I in the inductor resistance is very small.

With the continuous innovation of induction heating technology, high energy saving and low cost have become the development direction of induction heating equipment and the goal of induction heating technicians. 

the thyristor intermediate frequency device is composed of controllable or uncontrollable rectifier, filter, inverter and some control and protection circuits.

When using medium frequency furnace for smelting, small skills can effectively save energy.

Fault phenomenon: the equipment cannot be started. When starting, only DC ammeter has indication, and DC voltage and intermediate frequency voltmeter have no indication.