Cold-shrinkable cable accessories are a kind of prefabricated cable accessories that can be constructed at room temperature without heating. The cold-shrinkable power cable accessories are made of imported liquid silicone rubber. After installation, they always maintain a proper radial pressure on the cable body. The interface characteristics are relatively good, and there will be no creepage breakdown due to cable operation. The stress control part is integrated with the main insulation, which effectively solves the problem of electric stress concentration at the outer shielding section of the cable and ensures reliable insulation. It is a very important cable accessory.
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Common Causes Of Cable Termination Heating
1、High Voltage Cable Termination Structure and Insulation Mdium
1.1 Overall Structure
High-voltage cable terminations can be divided into porcelain sleeve type, composite sleeve type, integral prefabricated type, GIS termination, etc. Their core structure is similar. The description here is based on the ceramic sleeve type cable termination structure as an example.
Figure 1 Typical structure of porcelain sleeve type cable termination
1—Outlet fittings, 2—Wiring post, 3—Shield cover, 4—Insulation filler, 5—Porcelain sleeve, 6—Stress cone protective cover, 7—Stress cone, 8—cone support, 9—support insulator, 10— Tailpipe
Briefly Describe the Basic Knowledge of Cable Accessories
Cable accessories refer to the intermediate connections and terminal connections of various cables in the cable line, which together with the cables form a power transmission network. With the continuous development of cable manufacturing technology, cable accessories have gone through several stages, such as cast cable accessories, wrapped cable accessories, heat shrinkable cable accessories, prefabricated cable accessories and cold shrinkable cable accessories. At present, the most widely used are heat shrinkable cable accessories, prefabricated cable accessories and cold shrinkable cable accessories. Next, let’s take a look at it in detail.
The Flame Retardant Grade of Cable is Related to the Safety of Life. Have You Chosen the Right One?
With the development of wire and cable production technology, there are more and more types of wires and cables. Even cables of the same kind have different specifications and grades. However, their requirements for fire resistance and flame retardancy have been ignored by people, and their grades are not up to standard, which easily lays huge hidden dangers for fires. If all the highest levels are used, there will be a little “waste”. Then several elements of the flame retardant grade of wires and cables should be considered in the project engineering design? Here are some suggestions for you, hoping to help you.
Can the Waterproof Piercing Clamp be Used Directly Under Water?
It should be said that the piercing clamp is a relatively large choice in the implementation of the current cable and wire branching program. However, in many branching programs, most people will have a question in their minds, is the piercing clamp waterproof? Can the waterproof piercing clamp be directly buried or used underwater? Let’s take a practical case for analysis.
Do You Know the Difference Between Power Cables and Control Cables?
Generally, power cables are within 5 cores. They are generally used for high-voltage power. The number of cores of control cables is relatively large. Sometimes customer requirements are different, generally to 37 cores, but there are more cores.
Must-see! Installation Matters of High-Voltage Switchgear
What is high-voltage switchgear equipment? High-voltage switchgear refers to the role of on-off, control or protection in the power generation, transmission, distribution, power conversion and consumption of the power system. Electrical products with voltage levels ranging from 3.6 kV to 550 kV, mainly including high-voltage circuit breakers, high-voltage isolation switches and grounding switches, high-voltage load switches, high-voltage automatic reclosers and sectioners, high-voltage operating mechanisms, high-voltage explosion-proof power distribution devices, and high-voltage Switch cabinets, etc.
Electrical Transformer Basics
1. PRODUCT CLASSIFICATION
Classified by cooling method: dry type (self-cooling) transformer, oil-immersed (self-cooling) transformer, fluoride (evaporative cooling) transformer.
Classified by moisture-proof way: open type transformer, potted transformer, sealed transformer.
Classified by core or coil structure: core transformer (insert core, C-core, ferrite core), shell transformer (insert core, C-core, ferrite core), toroidal transformer, metal foil transformer.
Classified by the number of power phases: single-phase transformers, three-phase transformers, multi-phase transformers.
Classification by use: power transformers, voltage regulator transformers, audio transformers, medium frequency transformers, high frequency transformers, pulse transformers.
What is Power System Reliability?
All kinds of equipment in the power system may have different types of failures in operation, which affect the normal operation of the power system and the normal supply of electricity to the customers. Power system reliability is the measure of the ability of the power system to supply power and electrical energy to customers uninterruptedly according to acceptable quality standards and the required quantity.
The interruption of power supply to customers due to power shortage or accidents in the power system will cause different degrees of losses to industrial and agricultural production and people’s life. Therefore, power supply enterprises have been taking various technical and management measures to improve the reliability of power supply in the planning, design and operation stages of the power system for a long time.
Common Faults And Treatment Of High-Voltage Electrical Equipment
Common Faults And Treatment Of High-Voltage Electrical Equipment
The focus is on the failures and solutions of 10kV circuit breakers (vacuum, sulfur hexafluoride), disconnectors, busbars, transformers, transformers, cables and arresters. Engineering and technical personnel can refer to this article to analyze and process the accidents of high-voltage electrical equipment to ensure the safe operation of electrical equipment, reduce the impact of accidents, prevent problems as much as possible, and eliminate accidents in the bud.
According to the regulations, the voltage above 250 volts is called high voltage. Here we are mainly talking about 10 kV complete sets of equipment: that is electrical switchgear, metering cabinets, capacitor cabinets, etc. It also includes incoming and outgoing wires and transformers.