The use of insulated wires in the transformation of rural power grids can improve the safety level of rural power grids, reduce power outages in rural power grids, and reduce the number of electric shock and casualties among rural customers. It has significant operational benefits. Especially when crossing forest areas, densely populated areas and houses, the workload of operation and maintenance can be significantly reduced, daily operation and maintenance costs can be reduced, and the controllable, controllable and controllable factors of safe production can be improved.
However, the rural power grid has its own unique operating characteristics, such as multiple customers, scattered power lines, and limited maintenance funds. When using insulated wires in the transformation, we must pay attention to the following items while insisting on the transformation of standards and management requirements. . In this way, the operational efficiency of the insulated wire can be significantly improved.
1 wire diameter selection problem
Because the rural power grid has long power supply lines, many power supply facilities, and limited maintenance funds, this determines that limited maintenance funds cannot implement large-scale renovation of rural power grids. Therefore, in the implementation of rural power grid transformation, under the conditions of sufficient funds, it is necessary to raise the standard of construction and transformation as much as possible, and in accordance with the principle of “changing one, becoming oneâ€, to ensure the insulated lines, towers and all kinds of fittings and accessories that are erected. It can meet the needs of the distribution transformer's final capacity to 400 kVA. In this way, when the capacity expansion and transformation are carried out in the future, the trouble of re-engineering the line can be saved and the investment benefit can be improved. For 400 kVA distribution transformers, the insulation wire diameter of each return line should be at least 120 mm2 and above (aluminum core), preferably 150 mm2, according to the low voltage with 2 return lines.
2 Continuation parts selection problem
All kinds of joints (gold fittings, accessories) used for insulated wires must be dedicated (puncture clamps are not recommended), and non-dedicated joints can not be used only to reduce the engineering cost during the transformation. In the construction of the renovation project, it is necessary to adhere to the principle of using special joints for material procurement and construction; in the daily use after completion and commissioning, for the newly added customer leads (including new customers and various types of temporary electricity) Materials must be stored in accordance with the principle of using special joints. In this way, the safe service life of the insulated conductor can be guaranteed.
3 shift control problem
In order to build a harmonious new countryside, the power supply enterprise is obliged to tap more of the lower line, and install more 2 meter and 4 meter power meter boxes to reduce the length of the customer's entry line and standardize the installation process of the customer's incoming line. Fundamentally improve the level of rural safe use of electricity. To this end, the 0.4 kV rural power supply line must be arranged and installed as much as possible when implementing the transformation. At the same time, considering the large weight of the insulated wire and its fittings and accessories, scientifically and reasonably controlling the gear distance can effectively solve the above problems. In principle, the span of the insulated conductor should be controlled within 40 m. It is best to combine the distribution of rural customers (houses), consider the situation of facilitating the installation of the lower line and reduce the customer entry line, and set the file more scientifically and reasonably. distance.
4 Lower line distribution box pre-installation problem
Due to various reasons such as adding new customers and adding new T-connection lines, during the operation of overhead insulated lines, it may occur that the insulation skin layer is to be broken and new customers and new lines are connected. If the power supply station (O&M unit) that undertakes the work at this time does not have a special connection piece with insulated wires stored in advance, it may leave a safety hazard when handling the insulation skin layer, which may occur during the operation. The danger of disconnection. To this end, in the design of the rural power grid reconstruction project, it is necessary to consciously consider the new line connection problems that may occur in the future, and pre-install a certain number of distribution boxes in advance at appropriate locations, so as not to leave a safety hazard for future connection work.
5 Grounding inspection device reservation problem
Overhead insulated conductors During the construction process, grounding inspection devices are usually installed on the terminal rods and tension bars to prepare for power inspection and installation of grounding wires during line maintenance. However, in the actual operation process, when most insulated wires are repaired and repaired, they will feel that the grounding electrical inspection device is installed too little, and sometimes the insulation layer must be re-cut, in order to perform electricity inspection and grounding at the specified location. line. In this way, the insulated wire will bring many hidden dangers in the future safe operation. To this end, in the construction process of overhead insulated conductors, grounding inspection devices can be added to the corner bars and branch poles to facilitate future maintenance and repair work.
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Tag: electroscope, rural network transformation, overhead insulated wire, wiring, rural power grid
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