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1. Arrester installation 1. Existing problems and handling Arrester is generally installed on the upper side of the high-voltage fuse. According to the regulations, “The height of the changing platform from the ground shall not be less than 2.5m.†This will cause damage to the arrester or cause grounding, short circuit, and checkout. At the time, the entire 10kV line needs to be powered off and it is not conducive to loading and unloading. In addition, the grounding lead of the arrester is too long from the ground and does not meet the relevant technical requirements. In view of the above problems, we have changed the mounting position of the distribution lightning arrester and installed it on the lower side of the high-voltage fuse. This will not affect the protection effect and scope of the arrester, but also help the normal assembly and disassembly of the arrester, reducing the number of power outages of the entire line. At the same time, when the performance of the arrester is reduced by lightning, the freewheeling current will inevitably cause the failure of the arrester itself, and the fuse will fuse, which will isolate the fault point, reduce the chance of single-phase or short-circuit tripping of the line, and increase the power supply. Reliability rate.
2. Installation Precautions The mounting point of the arrester should be more than 0.7m away from the fuse to ensure that the safety distance specified in the “Safety Practice for Electric Industry†is met during maintenance. The lead length of the arrester should be as short as possible and reliable. The wire should use 35-50mm2 black wire to reduce the lead reactance and reduce the residual voltage. The distance between the arrester and the transformer should be more than 2m, increase the inductance on the wire, and increase the relative lightning resistance level of the transformer. When the lightning arrester is removed and reinstalled, it must not be tied with wire or wire, but should be re-used with special fixtures to prevent creepage. In addition, the down conductor of the lightning arrester must be properly connected and tied on the cross arm and the pole to prevent accidents caused by grounding, short circuit or damage to the transformer when the arrester is exploded.
II. Problems in the Operation of Arrester
2.1 As the damage, breakdown, corrosion is not easy to install, the source of funds and the cost burden is difficult, and the village electrician's sense of responsibility is not strong, there are factors such as Pang Hing psychological, can not be installed, supplemented, and objectively lead to low installation rate and installation of arresters Not enough.
2.2 Due to the large workload of regular arrester arresters, a considerable number of arresters have not been calibrated for many years, and the formation of a malfunctioning arrester is still operating on the Internet.
2.3 As the responsibility of the construction, installation, and maintenance personnel is not strong, most of the arresters during operation have looseness, tilt, and misplacement of the mounting position, leads off, and other abnormal conditions.
2.4 Arrester products are of low quality and cannot effectively protect them.
2.5 The ground lead strand breaks the strand and winds, and some even use the wire instead of the ground lead wire, and most of them have the problem of large grounding resistance.
Third, how to rectify
3.1 Increase publicity and education to allow users to understand the necessity and importance of installing surge arresters.
3.2 The electrician should master the arrester installation process, regulate the construction, and leave no sequelae.
3.3 Strengthen the operation and management work, conduct inspections, inspections, and calibrations on a regular basis, and unqualified arresters cannot be operated on the Internet.
3.4 Actively promote the use of zinc oxide surge arresters.
3.5 Make a thorough inspection of the arrester grounding body and the transformer grounding body of all the distribution transformers in the area, and thoroughly handle the grounding resistance.
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Problems with installation and operation of distribution surge arresters
There are many problems in the installation and operation management of distribution and arrester arresters. Occasionally, users accidentally burn transformers and arrest lightning arresters. For a long time, arresters are installed on the upper side of distribution transformers. According to the operation comparison, this installation method is not reasonable.