Blank grounding of the circuit can cause tripping. When the neutral line of the no-load is grounded, if a ground fault occurs, the current of the circuit will flow back to the power supply through the grounding line. In this case, the current will be very large, which may cause the circuit protection device to think that the circuit has a fault and trip.
In addition, grounding the neutral wire without load can also cause voltage instability, thereby affecting the normal use of electrical equipment.
Possible causes of tripping
Insufficient grounding resistance: If the grounding resistance is insufficient, the grounding current will increase, leading to tripping. The grounding resistance can be increased by increasing the number of grounding electrodes, enlarging the area of grounding electrodes, or improving the material of grounding electrodes.
Grounding circuit break: If the grounding circuit breaks, the current will flow back through other paths, causing a trip. It is possible to check whether the grounding circuit is in good contact and whether there are any open circuits, and promptly carry out maintenance and replacement.
There is a problem with the grounding point of the neutral wire: If there is a problem with the grounding point of the neutral wire, it can also cause tripping. It is possible to check whether the contact of the neutral wire grounding point is good and whether there are any loose issues, and to repair and replace it in a timely manner.
Basic concepts and functions of grounding
Grounding refers to connecting the metal casing of electrical equipment, the structure of distribution equipment, and line towers to the earth to ensure the safety of equipment and personnel. The function of grounding includes reducing the danger of one phase grounding, stabilizing the potential of the system, and limiting the voltage to not exceed a certain range.
Protective grounding is the process of connecting the metal parts of electrical equipment that are not charged under normal circumstances to the ground, in order to prevent the metal casing of the electrical device from being charged and endangering personal and equipment safety.