Four-core overhead cables overhead cables overhead cable factory in Shaanxi

Overhead cable equipment cause line Tripping 1.3 Equipment reasons:? 1.3.1 line equipment quality: the quality of the line materials are mostly concentrated in the porcelain fittings and other DPM, because the material is small, with less, easy to overlook when purchasing channels low purchase price , cause product quality caused by line accident. 1.3.1.1 poles: concrete pole low grade concrete, poles reinforced or reduce the number of inadequate cross-section, resulting in cracking down rod. 1.3.1.2 guide (ground) line: containing impurities, the cross-sectional area is not enough, causing breakage. 1.3.1.3 iron accessories: containing impurities reach the required strength, causing iron cross arm twisted or broken, poor quality galvanized steel, corrosion serious long-term operation. 1.3.1.4 Fitting: product quality flaws, broken off or overhead. 1.3.1.5 Insulator: insulating value below standard, or decreasing speed, eventually to zero value insulator breakdown. 1.3.1.6 Fault lines run: travel time longer, the safety factor of natural decline, causing line failure. 1.3.2 The quality of equipment: electrical equipment when purchasing more stringent checks, will not easily direct a device failure, mostly changes in the external environment and internal quality during operation by device defects caused by line trip. 1.3.2.1 Transformers: intercompany Windings, starvation can not be cooled, high and low voltage windings trailer coupling lead off contact with an initiator such as distribution transformer burned accident. 1.3.2.2 Breaker: distribution network branch line protection circuit breaker spring energy storage mechanism, mostly due to the elastic deformation, the operating mechanism failure mechanical wear, resulting in the switch tripping caused by grade trip is the main reason, followed by protection failure cause the jump. Overhead insulated cable power supply neutral point ungrounded three-phase four-wire distribution system, are not allowed to use to protect access to zero, but only with the protective ground. Neutral grounding of the power distribution system, when a phase conductor and the ground contact phase short-circuit current through the ground line and power neutral grounding devices, you can make the fuse blows, immediately cut off the faulty line . But in ungrounded distribution system, any phase grounding occurs, the system is still running as usual, though, but this time with wire needle equipotential earth and the ground, then connected to the zero line of the electrical equipment enclosure to ground voltage will be equal to the grounding wire from ground relative to the neutral point of the power supply voltage, it is very dangerous.