High voltage cable The ultimate guide
Introduction
We manufacture and distribute high voltage cables and other cable types at SSG. We design and manufacture a wide variety of high voltage cables as per our customer’s requirements.
We buy the best quality of tested raw materials to manufacture high voltage cables. We are backed by technologically advanced infrastructure. We also have a team of qualified experts with experience in manufacturing high voltage cables.
Our cables comply with international cable standards. We have achieved many certifications including ISO for attaining quality cable standards.
SSG high voltage cables are flexible, light in weight and strong. They require low maintenance services once used well. We have high voltage cables of every type starting from XLPE to Marine cables.
The cable is used in buildings, house wiring, engineering plant construction, etc. Our high voltage cable has a variety of applications in instruments, ignition systems, and transmission.
We also work with various industries to help them install and maintain the cable. We also fix broken or no-functioning high voltage cables in your industry.
At SSG, We supply high voltage cables up to 240kV. High voltage cable may be of any length depending on our customer’s specifications. We have relatively short cables used in apparatus and long cables for power distribution along with buildings.
If you need our high voltage cable please let us know. We have our sales team standby to receive your order. Our delivery services are efficient in any corner of the world.
We work with the best cable manufacturers to make sure the cable system we provide is reliable and of the highest quality. The experience we gain from the manufacture, supply, and installation of over 7.00km of high voltage cables allows us to create a comprehensive offer corresponding to our customer demands.
For more information about high voltage cables, read through our ultimate guide. You can also contact us for more information.
Chapter 1: What is a high voltage cable?
A high voltage cable abbreviated as HV is a cable for electrical power transmission at high voltage. The cable is made up of a conductor and an insulator.
The conductor can either be of copper or aluminum. The cable is suitable to be run underground, on bare land or underwater.
The insulation present in our high voltage cable makes it be applied in different mechanical systems. We have the cable designed to have joints and terminals to control high voltage stress which causes the breakdown of the insulation.
The high voltage cable is made to have a control leakage system for preventing contact of high voltage contactor with other objects.
The insulation is made to have a metallic shield layer around it. This metallic shield is connected to the ground and designed to equalize the dielectric stress on the insulation layer.
High voltage cable is designed to have different lengths. We have short high voltage cables for the apparatus. Long voltage ones are used in power transmission in industries.
Our high voltage cable is designed to offer good mechanical and temperature performance. The cable has a high strength loosed tube that is hydrolysis resistant.
High voltage cable is designed to have a special tube filling compound to ensure a critical protection of the fiber. The cable is designed to have a compact structure for making sure loose tubes don’t shrink.
We use steel wire as a central strength member. The PE sheath protects the cable from ultraviolet radiation.
At SSG, we have extensive experience in providing high cable systems in the international market. For over 30 years we have been able to achieve over 200 high voltage cable system projects.
Using this experience we are able to offer advice and technical support to many industries about cable system selection. We also do the installation and post-installation services. If you need our high voltage cable, please send us an email.
We also design and optimize cable structures including the calculation of current carrying capacity.
We offer high voltage cables with an inbuilt facility to enable continuous measurement of cable temperatures. The technique we use is based on the distributed temperature sensing technique.
In this technique, the temperature sensing function is performed by a fiber placed in a protective tube. The fiber is then laid within the copper wire screen during cable manufacture.
This solution negates the need to lay an additional DTS cable at the installation stage. This helps in connecting the monitoring apparatus directly to the cable.
Chapter 2: how is high voltage cable made?
To understand a high voltage cable you need to know how it is constructed. This way it will help you know how to handle it.
The cable is made using the best-selected materials which comply with the international cable standards. The cable is made up of an insulator, a conductor and a protective jacket.
The difference between a high voltage cable and a low voltage cable is that the additional internal layer. The additional internal layer in high voltage cables is used to control the electric field around the conductor. The internal layer is contained in the insulation jacket.
We have a conductor shield surrounding conductors of circuits operating above 2000 volts. This shield is essential for equalizing the electrical stress on the cable insulation.
The individual conductors of the shield are connected to the ground at the end of the shield. Stress relief cons are applied at the shield ends.
The cable conductor is made of copper or aluminum. The choice is a matter of customer’s prevalence or current-carrying power.
Large size solid conductors are made of aluminum.
The following are the available conductor solutions at the SSG factory.
| Oval shaped stranded compacted conductors of up to 800mm2. This is mainly recommended for external gas pressure cables. |
| Round solid conductors of up to 200mm2 |
| Circular conductors with shaped wires up to 200mm2 |
| Segmented conductors and circular shaped conductors of up to 2500 and 1200mm2 |
The conductors are manufactured to meet the relevant requirements of national and international standards. For special requirements, the conductors can be made watertight.
The watertight metallic enclosure acts as the insulating metallic screen. At SSG, both extruded lead sheath, as well as an aluminum sheath, can be applied.
A combination of the copper wire screen and a metal sheath is also available with us. The space between the cable core and water barrier in all our high voltage cables is made longitudinally watertight.
Laying up of three cores and provision of strong steel armor is essential in our high voltage cable. At SSG, we make use of all our available machinery to carry out these production steps.
The insulation for high voltage cables is lapped from high-quality insulating papers. The paper insulated cable cores are impregnated in appropriate vessels with both low and high viscous compound.
Our highest quality standards together with the latest process control equipment ensure the manufacture of cables meeting the standards. Our cable’s highest requirements enable the development of most advanced power cable systems.
The ampacity of your grind may be restricted by thermal limits based on fixed and standardized parameters. It is not possible to control grinds dynamically and in real-time. For this, we bring you high-quality of our high voltage cables which might prevent this from happening.
Chapter 3: Why are high voltage cables smaller than low voltage cables?
Small in terms of the current-carrying conductor. The conductor of our high voltage cable is made of copper. Therefore it is able to carry high voltage. Being small makes our cable to be transported from one place to another.
Also, it’s very easy to install such cables without causing any discomfort.
Copper is lighter than aluminum hence our high voltage cables made of the copper conductor are light in weight.
At full load, a high voltage cable will draw 13.6 amperes while the secondary side will supply 696 amperes. The insulation of high voltage cable is thicker than low voltage cable hence a decreased diameter.
So as voltage increases the current decreases. High voltage cables carry the low current to keep power flowing through it. Since power loss is increasing at the square rate to that of current, high voltage cables can be used because they are thinner.
Since a low voltage cable carries more current it needs thicker cables to compensate for the power loss.
The advantage of using high voltage cables is that there is no power loss due to their thickness.
High voltage cable has a lesser diameter than low voltage cables. ssThe conductor size tends to decrease with an increase in voltage.
Chapter 4: What are the properties of high voltage cable?
We manufacture high-quality high voltage cables with the best properties. The manufacturing process is followed by testing of the cable to ensure they have the required properties.
Our high voltage cables display the following properties;
| Light in weight- our high voltage cable is light in weight when carrying from one place to another. This means that our cable can be transported to any corner of the world. Being light in weight makes them be installed easily. |
| Safe and secure- High voltage cables are safe and secure to use. We have a regulator available in the insulator for controlling the current. We also provide safety precautions for handling to avoid the issues of shock. |
| Reliable and efficiency- Our high voltage cable is reliable and efficient to use. You can order any quantity of the high voltage cable and we will deliver. |
| High voltage cable is also easy to implement in the circuit. |
Chapter 5: How do you select cables for high voltage?
Selecting high voltage cables is very easy once you have known what a high voltage cable is. We also help customers identify high voltage cables for their projects.
We have the design resource to enable you to select the cable and equipment necessary to meet your requirements.
The selection of high voltage cables should be done carefully to avoid selecting the wrong cable. There are some specifications you should follow in the selection process.
The selection of the conductor cross-section is based on the required current carrying capacity of the cable circuit. The selection of the metallic sheath is also based on the required short current capacity duration.
We work closely with customers in providing a practical effective solution.
The selection process is based on placement and operating condition accessories.
The following are some of the considerations in selecting high voltage cables;
| The conductor size- the conductor size of a high voltage cable must be sufficient to keep losses sufficiently low. The diameter of the conductor affects the strength of the electric field. This means a solid conductor will have less dielectric stress than a stranded conductor. If you increase the number of strands it will reduce losses if the current is of high frequency. |
| The insulation material- the insulation around the conductor might be slightly conductive. This is done to reduce electric stress by creating a larger diameter of the conducting surface. There are many insulating types available with us and their selection depends on factors such as flexibility, frequency, price, and AC or DC voltage. At higher voltages there here might be a combination of layers of the insulation to manage the stress. |
| Shielding- High voltage creates a field around the conductor that is influenced by the cable insulation and everything that is in proximity to it. If shielding is used then the field is contained between the high voltage conductor and the shield. You can calculate this using the dielectric constant and the thickness of the cable insulation. |
| Also, use insulation with a low dielectric constant. |
| The current requirement of the load |
| The voltage drop and the current-carrying capacity |
| The ambient conditions- hot condition or poor ventilation may decrease the capacity of the cable, so you need a bigger cable for the same current. |
| The ability of a cable to withstand temperature rise in case of a short circuit. If the cable is too small it will catch fire before the circuit breaker operates. |
| The spacing between cable |
| A high voltage cable should have a metallic screening to prevent radiated electromagnet field. |
Chapter 6: What is the effect of High voltage cable capacitance on operational limits?
The effects of high voltage cable capacitance on operational limits will depend on the following factors.
- The charging current- The capacitance of a high voltage cable will cause continuous current to flow even when no load is connected. This is referred to as the charging current. Cable capacitance increases with the length of the cable.
- Shunt reactive compensation- where the cable is used in transformers it additional windings may be provided to insert necessary reactance. The effect of the shunt reactance is to decrease the reactive current flowing in the circuit.
- Conversion of AC to DC transmission- the insulation required for DC current cables is lower than that of AC hence cost is lower.
Chapter 7: How do you test a high voltage cable?
We perform the following tests on our high voltage cable
- On-site risk assessment- any risk associated with high voltage is conducted to the place of installation. There are some machines or areas which cannot withstand high voltage current.
- Preliminary steps and safety management- in this you are advised to use correct methods to positively identify the cable to be tested. Also, ensure the associated gear operationally
- Check and record cable identification
- You need to verify the sheath integrity
- Perform a core insulation test to determine the insulation resistance of the high voltage cable.
- Finally, carry out a high voltage withstanding test and record any leakages with the current.
Chapter 8: What are the types of high voltage cables?
We have various types of cable which operate under high voltage. Welcome to ASG and let us help you in choosing high voltage cable.
-Single-core XLPE high voltage cable with copper and aluminum laminated sheath
We have the single-core high voltage core with an aluminum lamination sheath. The cable has a copper conductor optionally with a longitudinal water barrier. The inner semiconductor layer is firmly bonded to the XLPE insulation. The outer semi-conductor layer is firmly bonded to the cable insulation.
The cable has a copper wire screen with some semi-conductive swelling tapes acting as a longitudinal water barrier. The sheath is aluminum insulted. The sheath is halogen-free, has a mechanical protection and a flame retardant layer.
This cable complies with IEC 62067 standards of cable manufacture. If you need this type of high voltage cable let us know.
- High voltage XLPE cable with corrugated aluminum sheath
The conductor is made of copper aluminum or copper material. It has a semi-conductive screen extruded on the phase conductor. It is XLPE insulated.
The cable has a semi-conductive screen extruded o the insulation.
It has an optional semi-conductive layer with a metallic sheath extruded corrugated aluminum. For this and other cables make your order now.
- High voltage XLPE cable with lead alloy sheath
The conductor is made of copper or aluminum. It has a semi-conductive screen extruded on the phase conductor. The cable is XLPE insulated and it has a semi-conductive screen extruded on the insulation.
The metallic sheath is made of a lead alloy. This cable has been approved by IEC standards as fit to be used as a high voltage cable.
Chapter 9: Why choose high voltage cable from SSG.
SSG is a certified company with over decades in the manufacture of high voltage cable. We also design other cables as per our customer’s requirements. We have a team of qualified engineers in checking the quality of our cable.
Our cable complies with the British and other international standards of manufacturing cables. The cable undergoes a series of annual prequalification test in a specially constructed test field.
You can rely on us to provide you with effective and efficient high voltage cables. Our cables rea very easy to install and to some extent, you can rely on us for installation services.
Some of the advantages you can get from using our high voltage cables include;
- Low electric losses.
- It’s easier to install them
- They have the highest degree of reliability and safety
- The impact they cause on the environment is minimal
- We have modern manufacturing methods hence each stage of insulation is reported and fully traced.
For over the years we have been working with several industries like;
- Steel mills, Airport lighting, ships, Windpower mills, electrical machinery industries, etc.
We pack the cables in a wooden drum or plastic drum for easier transportation. We also provide other packing options according to customer requirements.
We also manufacture other cables like;
If you need any of the cables to send us your specifications and project details then leave the rest to us.
Chapter 10: High voltage cable at SSG Cable Inc. R&D Co., Ltd
Our research and development team is working on integrated high voltage cable systems. We plan on maintaining market dominance through strengthening core competencies. Our research competencies include the provision of optical high voltage cable for indoor use.
We aim at securing future growth engines by discovering extra high voltage cables. R&D on technical information is also an affirmative action which needs to be attended to.
Special cable No.4 workshop, it covers 1400,000.00 sqm, adopting most advanced wire and cable equipment from Germany and Finland, annually sales avenue over 1.6billion US$. SSG is the largest XLPE cable manufacturer in China. Supplying the best special cable includes marine cable, mining cable, nuclear cable, wind cable, offshore cable, rubber cable, etc.