Problems in the operation of power distribution arrester manufacturers and their solutions

1　Surge arrester factory installation

1.1 Existing problems and solutions

The distribution type arrester is generally installed on the upper side of the high-voltage fuse, according to the regulations: "The height of the base of the substation shall not be less than 2.5m from the ground." In this way, when the arrester is damaged or causes grounding, short circuit, calibration and replacement, the entire 10kV line is required Power failure, and it is not conducive to assembly and disassembly. In addition, the ground lead of the power distribution type arrester is too long from the ground, which does not meet the relevant technical requirements. In view of the above problems, we changed the installation position of the power distribution arrester and installed it on the lower side of the high-voltage fuse. This will not affect the protection effect and scope of the lightning arrester, but also facilitate the normal assembly and disassembly of the power distribution arrester, reducing the number of power outages across the entire line. At the same time, when the performance of the distribution type arrester is reduced by lightning, the power frequency freewheeling increases, which will inevitably cause the arrester itself to fail, and the distribution transformer fuse will blow, which will isolate the fault point and reduce the chance of single-phase grounding or short circuit tripping. , Improve the reliability of power supply.

1.2 Precautions for installation of power distribution type arresters

The installation point of the power distribution type arrester should be greater than 0.7m from the fuse to ensure that the safety distance specified in the "Electrical Safety Work Regulations" is met during maintenance. The lead length of the power distribution type arrester should be as short as possible, and the contact should be reliable. The wire should be 35-50mm2 black glue wire to reduce the lead reactance and reduce the residual voltage. The distance between the distribution type arrester and the transformer should be greater than 2m, increase the inductance on the wire, and improve the relative lightning resistance level of the transformer. When the power distribution type arrester is disassembled and then installed, it cannot be bound with iron wire, wire, etc., but should be re-installed with a special clamp to prevent creepage. In addition, the down conductor of the arrester must be connected well and tied to the cross arm and pole to prevent accidents such as grounding, short circuit or damage to the transformer when the arrester explodes.

2　Problems in the operation of power distribution arrester manufacturers

2.1 Distribution-type arresters are not easy to install due to damage, breakdown, and corrosion, financial sources and cost burdens are difficult, coupled with the village electrician’s weak sense of responsibility, there are factors such as fluke psychology, and cannot be installed and supplemented in time, which objectively leads to the installation rate of arresters Low and insufficient number of installations.

2.2 Due to the heavy workload of regular verification of power distribution type arresters, a considerable number of arresters have not been verified for many years, and the arresters that have lost their function are still running on the Internet.

2.3 Due to the weak sense of responsibility of construction, installation, and maintenance personnel, most of the power distribution type arresters in operation have various abnormal conditions such as loosening, tilting, incorrect installation position, and wire loss.

2.4 The product quality of the power distribution type arrester is low and cannot effectively protect it.

2.5 The ground down conductor is broken and twisted, and some even use iron wire instead of the ground down conductor, and most of them have the problem of large ground resistance.

3　How to rectify the distribution type arrester

3.1 Increase publicity and education to let users understand the necessity and importance of installing lightning arresters.

3.2 Let the electrician master the installation process of the arrester, standardize the construction, and leave no sequelae.

3.3 Strengthen the operation and management work, and conduct regular inspections, inspections, and verifications. Unqualified arresters cannot be operated on the Internet.

3.4 Actively promote the use of zinc oxide arresters.

3.5 Conduct a careful inspection of the arrester grounding body and transformer grounding body of all distribution transformers in the jurisdiction. The grounding resistance must be thoroughly dealt with.

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbows, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-heads, wall bushings, European cable accessories, American cable joints, transformer neutral point protection devices, fuses, isolating switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products