There are two main reasons for the heating of the zero line of the Ready Board: the zero line terminal is falsely connected; The zero line current caused by serious three-phase imbalance is too large: the cause of zero line overcurrent in the Ready Board: with the increasing improvement of people's living power consumption level, the single-phase power consumption situation is becoming more and more complex.

Harmfulness of excessive zero line current of Ready Board: excessive zero line current causes overload of zero line cable, acceleration of insulation aging, breakdown of insulation and short circuit, which increases the hidden danger of fire; The third harmonic generates zero sequence circulating current and zero sequence magnetic field of iron core in the transformer coil, reduces the output of the transformer, increases the loss of the transformer, and causes serious heating of the transformer.

It increases the loss and heating of other equipment and materials in the power supply system, accelerates the insulation aging and reduces the service life; The zero line current is too large, and the switch trips irregularly and frequently; Neutral point zero drift, neutral line generates voltage to the ground, causing hidden dangers to equipment and personnel; The manufacturer of Ready Board increases the vibration and noise of equipment and materials in the power supply system; The reactive power compensation capacitor bank is damaged due to parallel resonance, and the insulation of TV and other equipment is damaged due to breakdown