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Generally, after water ingress into the cable, water tree aging will occur under the action of electric field, which may lead to cable breakdown. Water tree refers to the collection of voids filled with water with a diameter of 0.1m to several microns. Impurities, pores and uneven junction between insulation and inner and outer semiconducting layers in the insulation may become the incubation place of water tree. Water tree development process is very long
Published on: December 10, 2018 Clicks: 1635
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Shandong Peninsula Cable Co., Ltd., founded in 1984, covers an area of more than 100000 square meters, with a construction area of 45000 square meters, and has fixed assets of 400 million yuan and current assets of 200 million yuan. It is a large wire and cable manufacturing enterprise. Specializing in the R&D, manufacturing and sales of various power cables. Shandong Peninsula Cable Co., Ltd. is always looking for people with disabilities who can work
Published on: November 1, 2018 Number of hits: 595
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Before the installation of power cable lines, the construction works shall meet the following conditions: 1. The embedded parts shall meet the design and be firmly placed; 2. The floor and plastering work at cable trench, tunnel, shaft and manhole are completed; 3. The temporary construction facilities, formwork and construction waste at the cable layer, cable trench, tunnel, etc. shall be cleaned and the construction shall be carried out
Published on: November 7, 2017 Number of hits: 219
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Classification of power cables 1. According to the voltage level, it can be divided into ① low-voltage power cables (1kV); ② Medium voltage power cable (6~35kV); ③ High voltage power cable (110kV); ④ Ultra high voltage power cable (220~500kV). 2. Classification according to the number of conductor cores
Published on: November 7, 2017 Number of hits: 217
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The basic structure of power cable No matter what kind of power cable, its most basic components are three parts, namely conductor, insulation layer and sheath. For power cables with medium voltage and above, the conductor has high potential when transmitting electric energy. In order to improve the distribution of electric field, reduce the electric field distortion on the conductor surface and the outer surface of the insulation layer, and avoid tip discharge
Published on: November 7, 2017 Number of hits: 203
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1. When selecting the type of wires and cables, such as power cables, the purpose, laying conditions and safety shall be considered; According to different purposes, power cables, overhead insulated cables, control cables, etc. can be selected; According to different laying conditions, general plastic insulated cable, steel tape armored cable and steel wire can be selected
Published on: November 7, 2017 Number of hits: 203
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The route selection for underwater power cable laying shall meet the requirements that the cable is not vulnerable to mechanical damage, can implement reliable protection, is convenient for laying, and is economical and reasonable, and shall meet the following requirements: 1 The cable should be laid in the water where the riverbed is stable, the flow rate is slow, the shore is not easy to be washed, the seabed is free of obstacles such as rock mountains or sunken ships, and there are few anchor sinking and trawler activities
Published on: November 7, 2017 Number of hits: 356
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Before running the cable network, the security work must be done well. 1. Load monitoring. General power cable lines specify the maximum current value according to the cross-sectional area of the cable conductor, insulation type, etc. Various instruments are used to measure the load current of the wire line or the cable skin temperature, etc., as the main load monitoring measures, to prevent the cable insulation from exceeding the allowable maximum temperature and shortening the cable
Published on: July 27, 2016 Clicks: 144
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Test and acceptance of power cable put into operation (I) Test of power cable In addition to handover test and preventive test, insulation test shall also be carried out during construction to identify and check the cable quality and process quality of each link of construction. Before laying, test on the cable reel to identify the cable cup; Test after and before laying
Published on: July 27, 2016 Clicks: 138
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For power cable lines with anti-interference requirements, anti-interference measures shall be taken according to power cable design or equipment manufacturer requirements. For lighting poles equipped with lightning rods, the cable laying shall meet the relevant requirements of grounding devices. The cable entering the building shall be equipped with a protective barrier. When entering the panel (cabinet) and penetrating the pipe, the inlet and outlet shall be closed, and the pipe orifice shall be sealed& n
Published on: July 27, 2016 Clicks: 138
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Function, structure and characteristics of power cable ring network unit: (1) Function: power cable ring network unit, also known as ring network cabinet or switch, is used for MV power cable segmentation. Contact and tap load. The power cable ring network unit can be divided into indoor and outdoor types according to the applicable places, and can be divided into integral type and interval type according to the structure. （
Published on: July 27, 2016 Number of hits: 207
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Function, structure and characteristics of power cable connection equipment power cable branch box: (1) Function: to complete the convergence and tapping of cable lines in the distribution system, but generally it is not equipped with switches, and it is not equipped with special electrical connection equipment with secondary auxiliary configuration such as control measurement. (2) Structure: there is no switchgear in the branch box
Published on: July 27, 2016 Number of hits: 187
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Power cable installation, commissioning scheme and implementation method 1) Cable laying requirements 1. The cable steel support must be correctly positioned, firmly welded, neatly arranged, and provided with anti-corrosion treatment; 2. The cable steel support shall be reliably grounded, and the grounding wire shall be connected by lap welding, and the welding length must meet the specification requirements;
Published on: July 27, 2016 Number of hits: 314
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Operation and maintenance of power cables The operation of power cable lines is one of the important links in power production. The safety of cable line operation is related to the safety of enterprise production and the safety of people's lives and property. Based on years of work experience, the author briefly introduces the relevant issues in the operation and maintenance of power cables. Characteristic electricity of cable line
Published on: July 27, 2016 Clicks: 147
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Closed fault: short circuit to ground, broken wire, or their mixture, single phase, two phase or three phase fault. For example, if there is only ground signal when the power cable fails in operation, it may be a single-phase ground fault; In case of overcurrent tripping of relay protection, two-phase or three-phase short circuit or mixed fault of short circuit and grounding may occur. Passed preliminary
Published on: July 27, 2016 Number of hits: 155
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Article 2.0.4 If power cables and related materials are not installed immediately, they shall be stored according to the following requirements: I. Cables shall be stored in a centralized and classified manner, and the model, voltage, specification and length shall be indicated. There shall be channels between cable trays. The foundation shall be solid, and when limited by conditions, the plate shall be padded, and the storage place shall be free of water. 2、 The porcelain bushing of cable terminal is
Published on: July 27, 2016 Number of hits: 159
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As the main carrier of power transmission, power cable is not only affected by domestic and foreign policies and raw material prices, but also because it is widely used in power, construction, automobile, communication and other industries, and is inevitably closely related to the development of these downstream industries. Domestic and foreign policies In recent years, the state has vigorously carried out urban power grid construction, agriculture
Published on: August 2, 2016 Clicks: 228
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The concept of wires and cables and the distinction between wires and cables: power cables refer to materials used for power, communication and related transmission purposes. There is no strict boundary between "wire" and "cable". Generally, products with few cores, small product diameter and simple structure are called wires, those without insulation are called bare wires, and others are called
Published on: July 30, 2016 Clicks: 283
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Overview of power cable The insulated cable that can safely and reliably transmit large capacity power for a long time is called "power cable". The use of power cables comes into being with the generation of electricity. In 1879, the American inventor Edison wrapped jute on a copper rod and threaded it into an iron pipe, then filled it with asphalt mixture to make a cable, and laid the cable in New York
Published on: July 27, 2016 Clicks: 144
