The complete set of electrical enclosures shall be provided with protective measures for protective grounding or neutral connection. The grounding protection is used in the power supply system where the neutral point of the distribution transformer is not directly grounded (three-phase three-wire system) to ensure that the voltage to the ground generated by the leakage of the electrical complete set due to insulation damage does not exceed the safe range.
In order to ensure the normal operation and safety of the electrical complete set, the protection function must be grounded. In order to make the complete electrical grounding, the grounding device must be used. The grounding device mainly includes two kinds of grounding wire and grounding body. The grounding body is a metal body used to contact the soil directly; The grounding wire is used to connect the grounding body and the complete set of electrical wires.
In addition, check whether each connection point of the grounding device is damaged, corroded, broken and in good contact; Before the rainy season, when the soil resistivity is high, measure the grounding resistance of grounding equipment, and analyze and compare the measurement results. Check whether the grounding body within 500mm underground in the zone with strong acid, alkali and salt is seriously corroded.
Check whether the complete set of electrical connection grounding wire is normal, whether the grounding wire is connected to the grounding grid, and whether the grounding wire is connected to the grounding trunk line; For the overhauled electrical complete set, further check whether the grounding wire is firmly connected.
The grounding equipment of the distribution (substation) is usually inspected once a year; The grounding equipment used for lightning protection must be inspected once a year before the thunderstorm season; According to the specific situation of the building or workshop, check the overall operation of the grounding wire once or twice a year.
For the grounding device installed in corrosive soil, observe the specific operation and check the grounding body under the ground every 3-5 years; Measure the grounding resistance of grounding equipment once every 1-3 years; For mobile and hand-held electrical sets, the grounding wire shall be checked before each use. Come to our website for more relevant content Consult!