High temperature resistant wire and cable

Resistance to high temperature wire and cable is suitable for the communication additional voltage up to and including 0.6/1 kv for fixed installation, power transmission and distribution line motor lead wire, high temperature resistance, corrosion resistance, resistance to acid and alkali and corrosive gas, waterproof properties, such as high temperature environment safe electrical function, large carrying capacity, long using life, widely used in metallurgy, electric power, petrochemical, building, large car production.

One: FF, FFP, FF22, FFP22, FV22 KGG silicone rubber insulated and sheathed control cable KGGR soft silicone rubber insulated and sheathed control cable has good thermal stability, can stick to in high temperature, low temperature, corrosive outstanding electrical function and softness, metallurgy, electric power, petrochemical and other appropriate professional use which have special requirements such as mobile and heat-resistant occasions.
Two:Commodity Performance Specification Q/HHTZH004.2 Flame retardant and fire resistance test Performance GB12666-90 specification
Three: Use characteristics
Communication extra voltage: U0/U 450/750kV
High temperature wire and cable is a cable that can normally transmit signals or electrical energy at high temperature. Flame-retardant cable refers to the cable in which the sample is burned under the specified test conditions, and the flame spread only within a limited range after the removal of the test flame source, and the flame or flame can go out by itself within a limited time. The fundamental feature is that in the event of a fire it may burn out and not be operational, but it prevents the fire from spreading. Colloquially, in the event of a fire, the power line can limit the combustion within a local scope, do not produce spread, keep other various equipment, avoid causing greater losses.

(1) In order to reduce fire accidents caused by heating and burning of cables in metro, power stations, office buildings and public places, current flame retardant cables are mainly halogen flame retardant. In case of fire, a lot of smoke will be generated and toxic, irritating and corrosive hydrogen halide gas will be generated; Smoke can hinder fire fighting and evacuation, and hydrogen halide can corrode equipment and endanger human health.
(2) Petrochemical, steel, aerospace, shipbuilding, military industry, pharmaceutical, food, plastic machinery, boiler and other industries related to heat and high temperature need to be able to withstand a certain high temperature wire and cable
(3) Fire-resistant cables are used in high-rise buildings, subways, power stations and some important places, etc., with fire protection characteristics of environmental occasions. In addition to transmitting power under the rated working voltage of 0.6/1kV, it can also operate safely for a certain period of time in the case of combustion, and for 3 hours in the case of flame burning at a high temperature of 950-1000 degrees Celsius. This greatly improves the safety factor of fire-resistant cables, which has won a certain amount of time for fire rescue.

Quality inspection index of wire and cable

The inspection of wire and cable has always been an important part of national standard wire and cable. The higher the quality inspection department of a wire and cable enterprise is, the better the quality of the wire and cable produced by the enterprise is and the more trustworthy it is. And the more stringent the third-party quality inspection department is, the more conducive to the development of the industry.

1.Measurement of dc resistance of wire

The conductor cores of electric wires and cables mainly transmit electric energy or electrical signals. Conductor resistance is the main index, its electric performance of the ac voltage effect when the wire core resistance due to the surface of skin effect and proximity effect than dc voltage function, but when the electric frequency of 50 hz and small lines of standard specifies requirements that are only now the core of dc resistance or the resistivity is more than standard value, through the inspection can be found in the process of production of certain defects, such as broken wire or part of the single fracture; Traverse section does not meet the standard; Incorrect length of product, etc.

2. Test insulation resistance

The insulation resistance is an important index to reflect the insulation characteristics of wire and cable products, which is closely related to the electrical resistance, dielectric loss, and the gradual deterioration of insulation materials in the working state. For communication cables, if the insulation resistance between wires is too low, it will also increase circuit attenuation, cross-talk between circuits and long-distance power supply leakage on the conducting wire core, etc., so the insulation resistance shall be higher than the specified value.

3. Measurement of capacitance and loss factor

When the cable is applied with an AC voltage, a current flows through it. When the amplitude and frequency of the voltage are constant, the capacitive current is proportional to the capacitance of the cable (Cx). For ultra high voltage cables, the current of the capacitance may be comparable to the rated current, which becomes an important factor limiting the cable capacity and transmission distance. Therefore, the capacitance of the cable is also one of the main electrical performance parameters. By measuring the capacitance and the loss factor, it can be found that the insulation is affected by moisture, the insulation layer and the shielding layer fall off and other kinds of insulation deterioration phenomenon. Therefore, the measurement of capacitance and TAN delta is always carried out in the cable manufacture or operation.

4. Insulation strength test

The insulation strength of wire and cable refers to the ability of the insulation structure and material to withstand the action of electric field without breaking down. In order to check the quality of wire and cable products and ensure the safe operation of the products, all types of insulation wires and cables generally need to conduct insulation strength tests. The insulation strength test can be divided into pressure test and breakdown test. The voltage of time is generally higher than the rated working voltage of the test product. The specific voltage value and withstand voltage time are stipulated in the product standard. Through the withstand voltage test, the reliability of the product operation under the working voltage can be tested and serious defects in insulation can be found, as well as some shortcomings of the production process can be found

5. Aging and stability test

The aging test is a stability test that can maintain stable performance under the action of stress (mechanical, electrical, thermal). Thermal aging test: The simple thermal aging test is to test the characteristics of the test product under the action of heat aging. The test product is placed in an environment with a certain value above the rated working temperature, so as to obtain a shorter life at a higher temperature.

6. Thermal stability test

The thermal stability test is to evaluate the insulation stability by measuring some sensitive performance parameters after the cable is heated by current and subjected to a certain voltage during a certain period of heating. Insulation stability test can be divided into long-term stability test or short-term accelerated aging test.

The global subsea power cable market will grow at a compound annual rate of over 4% from 2020 to 2024

The market for subsea power cables is expected to grow at a compound annual rate of more than 4 percent from 2020-2024, driven largely by surging demand for electricity, according to Technavio.

According to the report, 47 percent of the market growth in the forecast period will come from Europe, with Italy, Denmark and Finland being important markets for European subsea power cables.

Europe is the largest subsea power cable market in 2019, and government support and growing concern about wind power will significantly drive growth in the subsea power cable market in the region during the forecast period.

Offshore wind turbines can produce more energy using fewer turbines than conventional ones. As a result, the Asia-Pacific region will enjoy rapid growth during the forecast period. Thanks to heavy investment in offshore wind projects over the past few years, China and India will account for most of the region’s share of the forecast period.

According to the IEA, demand for electricity will rise by 40 per cent by 2024. Similarly, growing environmental concerns will force economies to use renewable energy to generate electricity. As a result, the number of renewable projects such as wind and tidal power projects is increasing in most countries, which in turn will increase the demand for undersea power cables or submarine cables. The growing demand for intercountry and island connections will be one of the main drivers of market growth. Subsea power grid interconnection projects in France – UK, Belgium – UK and Ireland – UK are under construction.

On the other hand, the growing demand for high-voltage direct current (HVDC) power cables will also drive the market growth. These HVDC cables are more and more popular compared with traditional cables because they are safe and reliable and can transmit power over long distances. These factors will drive the global subsea power cable market to grow at a compound annual rate of over 4% over the forecast period.

From the manufacturers’ point of view, Prysman, Nexans, Sumitomo Electric, Lenny Cable, Ankart Cable, Tengura Cable, Guhe Electrician, LS cable will continue to dominate the global subsea power cable market in the forecast period.

Two cable news from Japan

1. Japan plans to popularize optical fiber network nationwide 2 years ahead of schedule

Japan’s Ministry of Internal Affairs and Communications, in an effort to promote online education and other coVID-19 response measures, will advance its plan to complete fiber optic lines nationwide by two years, aiming to make the network accessible to almost all households by the end of 2021, Japanese media reported.
Japan’s first and second supplementary budgets for 2020 totaled 53 billion yen (3.5 billion yuan) to support local governments and enterprises to improve fiber optic networks, hoping to provide necessary communications infrastructure for areas not covered at an early date. Since the fibre-optic network will also form the basis of online medical and administrative procedures, the Ministry of Internal Affairs will give up to 90 per cent of subsidies to local governments and businesses to improve the lines.
As of the end of March 2019, there are still about 660,000 households in Japan that are not yet connected to the fiber optic network. The lowest coverage rate was 91.8% in Nagasaki prefecture. Shimane prefecture was second with 92.0%, and Kagoshima prefecture was third with 93.3%.
In June 2019, the Ministry of General Affairs and Communications set a target to reduce the number of uncovered households to 180,000 by the end of 2023, covering almost all households. However, due to the impact of COVID-19, such as working at home and distance learning, the importance of network applications has been highlighted. The Japanese government has decided to advance the coverage of optical fiber network by 2 years.
Japan’s ministry of Internal Affairs and Communications intends to make fiber optic networks and fixed telephone networks a “universal service” that must be provided to the whole country.
In addition, optical fiber is also the basis of the fifth-generation (5G) mobile communication system built by mobile phone companies. More than 210,000 base stations are expected to be built by the end of 2023, about three times the original plan, the Ministry of Communications announced Thursday.

2.Japan may build 22 more coal-fired power plants in the next five years

The move by the Japanese government stands apart from the broader global push for renewable power generation. In fact, as far as the Japanese government is concerned, its “enthusiasm” for renewable energy is much lower than we think.
Indeed, after the 2011 Fukushima nuclear disaster, Japan did embrace renewable energy. Naoto Kan, the prime minister at the time, announced that Japan would start from scratch with a new energy strategy to boost its share of renewable energy. So far, however, progress has been slow. Between 2010 and 2018, the share of Japan’s electricity supply generated by renewable energy sources only increased from 10 percent to 17 percent, with nearly half of that coming from existing hydropower projects.
Not only that, but the power gap created by Japan’s nuclear shutdowns has been replaced by coal-fired and natural gas plants. While the government plans for nuclear power to still provide at least 20 per cent of Japan’s electricity demand by 2030 (up from more than 25 per cent before the Fukushima accident), coal’s share is set to grow and it has approved plans to build 22 new coal plants over the next five years. By contrast, Japan’s renewable energy targets of 22-24% are well below those of many European countries and below the current global average.

Five causes of cable fire and explosion

1. Insulation damage causes short circuit fault
The protective lead cover of power cables is damaged during laying or the cable insulation is damaged by mechanical damage in operation, which causes the insulation breakdown between cables or between the lead cover. The electric arc will cause the insulation materials and the protective layer of cables to burn up.
2. The cable is overloaded for a long time
For a long time in overload operation, the operating temperature of the cable insulation material exceeds the maximum allowable temperature of normal heating, making the cable insulation aging and dry up. This phenomenon of aging and dry up insulation usually occurs in the whole cable line. As the cable insulation ages and dries up, the insulation material loses or reduces the insulation performance and mechanical properties, so it is easy to break down and burn, or even burn up in many places along the whole length of the cable.

3. Insulation breakdown of intermediate connector box
The intermediate joints of the cable connector box are oxidized, heated and glued during operation due to loose pressing, weak welding or improper selection of joint materials; When making cable intermediate joint, the quality of insulating agent in the intermediate joint box does not meet the requirements. During the filling of insulating agent, there will be air holes in the box memory and leakage of moisture into the cable box due to poor sealing and damage. All the above factors can cause insulation breakdown, form short circuit, and cause cable explosion and fire.
4. Cable end combustion
As the surface of the cable head is contaminated by moisture, the porcelain bushing of the cable head is broken and the distance between the lead wires is too small, which leads to flashier fire and causes the surface insulation of the cable head and lead wire insulation to burn.
5. Cable fire caused by external fire source and heat source
Such as oil system fire spread, oil circuit breaker explosion fire spread, boiler pulverized coal system or coal conveying system coal spontaneous combustion, high temperature steam pipeline baking, acid and alkali chemical corrosion, welding spark and other fire, can cause the cable fire.

One of the largest submarine optical cable projects in the world

China Mobile International Corp, Facebook, MTN GlobalConnect, Orange, STC, Egypt Telecom, Vodafone and WIOCC have announced a partnership to build 2Africa, the most comprehensive undersea fiber optic cable serving the African continent and the Middle East, and will also connect through East Africa and other undersea cables to expand connectivity with Asia.Wires and cables

The developer has awarded Alcatel Subsea Network the contract to build the cable to greatly enhance connectivity throughout Africa and the Middle East.

2Africa is 37,000 km long and will connect Europe (east via Egypt), the Middle East (via Saudi Arabia) and 21 landing sites in 16 African countries, according to the report. 2Africa will provide much-needed Internet capacity and reliability across much of Africa, complement the rapidly growing capacity demand in the Middle East, and support further growth in 5G and fixed broadband access.

In countries where the 2Africa cable will land, service providers will have access to operator neutral data center or open access cable landing station capacity on a fair and impartial basis. This will support the development of a healthy Internet ecosystem by greatly enhancing the accessibility of businesses and consumers.Wires and cables

2Africa Cable will implement a new technology, ASN SDM1, which will enable the deployment of up to 16 pairs of optical fibres instead of the eight pairs supported by earlier technologies, resulting in greater and more cost-effective capacity. The cable will adopt optical switching technology to achieve flexible bandwidth management. The cable burial depth is also 50% higher than in older systems, and cabling will avoid known locations of seabed interference, all of which helps ensure the highest level of availability.

The system is scheduled to enter service in April 2023 and will deliver more than the total capacity of all submarine cables serving Africa today, with key components designed to have a capacity of up to 180Tbps. Once completed, it will be one of the largest undersea cable projects in the world.Wires and cables

What are the advantages of environmental friendly cables?

What are the advantages of environmentally friendly cables compared to other traditional cables? Compared with ordinary cables, environmentally friendly cables have the following advantages:

The first is to have high flame retardancy. We all know that the flame retardant performance of the cable is very important. It fully ensures the safety and fire resistance of the cable. The cable is not easy to burn and catch fire, and can prevent the flame from expanding.

The second is halogen free, green insulation, special oxygen barrier material, not only has good electrical performance, mechanical properties, and to ensure that the product does not contain halogen, to prevent the formation of traditional PVC wire burning in the combustion process to produce cancer-causing dioxins British materials to prevent secondary pollution.

The third is a new environment-friendly coated wire and cable material that is free of odor and corrosive odor, does not contain hydrochloric acid and other toxic gases, and produces no pollution to the environment. It will not produce or emit very little during the use and combustion. Acidic gas, to ensure the safety of personnel and reduce environmental protection features such as equipment damage.

The fourth one is high light transmittance. The smoke produced by burning environmentally friendly cables is very thin, which is helpful for evacuation and fire fighting. The light transmittance of the product is greater than 40%, much higher than that of the traditional flame-retardant cable and the light transmittance is lower than 20% or even higher.

The last one is the environmental protection type cable waterproof and ultraviolet protection performance, environmental protection type wire and cable special molecular structure, to ensure the production of ultra-low water absorption . Special ultraviolet absorber makes the product have good anti-ultraviolet performance。

Photovoltaic cable under the epidemic

A sudden outbreak in the beginning of the year disrupted the development and construction rhythm of downstream photovoltaic power cable stations, and a large number of projects may be difficult to be connected to the grid as scheduled.Photovoltaic cable under the epidemic.

According to the policy, the bidding photovoltaic project in 2019 should be completed and connected to the grid by the end of the year. If it is not connected to the grid, the price subsidy will be reduced by 0.01 yuan/kWh for each quarter of the overdue; if the grid is not completed and connected to the grid within two quarters of the overdue , Disqualification of project subsidies.


According to industry estimates, the scale of unsuccessful carry-over bidding projects in 2019 is about 12GW. From January to March, the country’s new photovoltaic installations will be 3.95GW, most of which are carried-over projects in 2019. Based on this estimate, there are still 8GW The project is faced with “630” pre-installation.Photovoltaic cable under the epidemic.

Nan Cunhui, member of the Standing Committee of the Chinese People’s Political Consultative Conference, vice chairman of the All-China Federation of Industry and Commerce, and chairman of Chint Group, said in the “Proposal to Extend the Term of Grid-connected Photovoltaic Power Stations in 2019” that the construction of domestic photovoltaic power plants in the first quarter was basically at a standstill, and construction started in late March The rate is only about 35%, about 65% in mid-April, and a large number of projects are difficult to connect to the grid as scheduled. However, for other regions outside Hubei affected by the epidemic, no policy has been issued for the extension of the bidding project grid connection, which will have a greater impact on the domestic photovoltaic market and enterprise operations.Photovoltaic cable under the epidemic.

Nan Cunhui said that without the support of subsidies, about 6GW of projects across the country are expected to choose to abandon construction, and about 24 billion yuan of investment will be lost. A large number of photovoltaic companies are facing the risk of inventory backlogs and profit declines and are even forced to stop production.Photovoltaic cable under the epidemic.

Not only the “630” project, at the industry public meeting, according to Hu Yidong, member of the Party Committee and deputy general manager of the Yellow River Upper Hydropower Development Responsible Company (hereinafter referred to as the Yellow River Hydropower) of the State Power Investment Corporation, affected by the epidemic, the “930” developed by the Yellow River Company “The project is also facing pressure on grid connection. In the 5GW new energy configuration project of the Qinghai Hainan UHV transmission base, the Yellow River Hydropower won the 4.1GW wind and solar project, of which the photovoltaic project scale was 2.4GW (including the size of the consortium). According to the construction progress requirements, the project should be completed and connected to the grid by September 30, 2020. If the full capacity is not completed and scheduled to be connected to the grid, the grid-connected electricity price will be reduced by 0.01 yuan/kWh every month beyond the deadline. By December 31, 2020 If the full capacity cannot be built and connected to the network, the project subsidy qualification will be cancelled.

Hu Yidong said that due to the sudden outbreak, the 4.1GW wind and light project “930” grid connection is under great pressure. From the current judgment, the entire project’s full-capacity grid connection may be delayed until the end of November. The photovoltaic project may reach 80% by September 30. ~90% capacity is put into production.Photovoltaic cable under the epidemic.