Supplier of Bentley extension cables

Bentley BENTLY extension cable from the United States

A common phenomenon during the use of cables is the heating of cable joints, which not only easily causes a large amount of electrical energy loss, but also has adverse effects on cable conductors and insulation. Mild cases can shorten the service life of cables, while severe cases can cause electric shock accidents or even fires, resulting in incalculable losses to people and property. So we should try our best to effectively avoid this situation from happening. So, how to deal with the heating of cable joints? Double star cable to teach you!

In the process of laying wires, some people often do not pay attention to installation quality and do not install insulation sleeves where they are needed; At the wire joints, the twisting method is not used, but the illegal hook shaped connection method is adopted. The contact resistance of this hooked connection method is high, and it continuously generates heat when powered on, which accelerates the aging of cable insulation and leads to breakdown. It may even cause nearby wooden boards to gradually dry and carbonize, leading to combustion and fire.

The conductor connection requires low resistance, so oxygen free copper is selected for the cable. At the same time, it is important to note that different types of conductors such as copper and aluminum should not be connected together, as this can cause oxidation and increase resistance. The connected cables should have sufficient mechanical strength and there should be no sharp corners at the connection.

If the cable has a shielding layer, it is necessary to ensure that the shielding layer is also connected both inside and outside. A portion of the internal semiconductor shielding of the cable should be left to allow the shielding of the connection head on the connecting pipe to be interconnected, ensuring the continuity of the internal semiconductor and evenly distributing the field strength at the joint connection.

Sealing and mechanical protection of joints. The sealing and mechanical protection of the joint are the guarantees for ensuring the safe and reliable operation of the joint. To prevent water and moisture from seeping into the cable joints, if the water seepage is severe, it may cause the entire electrical system to be scrapped. Therefore, joint protection grooves should be built or cement protection boxes should be installed at the joint positions.

Metal shielding is mainly used to conduct cable fault short-circuit current and shield electromagnetic interference from electromagnetic fields. In operation, the metal shielding is at zero potential in a well grounded state. When the cable fails, it has the ability to conduct short-circuit current in a very short period of time. The grounding wire should be reliably welded, and the metal shielding and armor tape on both ends of the cable body should be firmly welded.

Processing of cable reaction force cone. A reaction force cone with accurate shape and size during construction has an equal potential distribution on the entire cone surface. When making a cross-linked cable reaction cone, specialized cutting tools are usually used, and it can also be slightly heated with a low flame and cut with a fast knife. After the basic shape is formed, it is scraped with 2mm thick glass and finally polished with sandpaper from coarse to fine until smooth.

Whether it's the intermediate or terminal joints, once a problem occurs, it not only affects our daily life or work, but also our safety. Therefore, it must not be ignored, as prevention is always better than dealing with it after the incident.

extension cable

330130-035-00-00

330130-035-00-CN

330130-040-01-CN

330130-040-01-00

330130-040-02-00

330130-040-02-CN

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330130-070-00-CN

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330130-085-13-CN

probe

Supplying Bentley Nevada in the United States

Bentley 3300 Sensor Probe, Models: 330101, 330102, 330103, 330104, 330105, 330106, 330180, 330130, 330780, 330851, 3500/42, 3500/15, 3500/20, 3500/32.

330101-00-06-10-01-00

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330101-00-10-10-02-CN

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330101-00-11-20-02-CN

330101-00-12-10-01-CN

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330101-00-12-10-02-CN

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330101-00-15-10-01-00

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330101-00-15-15-02-CN

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330101-00-18-10-02-CN

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330101-00-24-05-02-CN

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330101-00-28-10-02-CN

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330101-00-36-10-01-00

330101-00-36-15-02-CN

330101-00-40-10-02-CN

330101-00-39-15-02-CN

330101-00-41-10-02-CN

330101-00-43-15-02-CN

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330101-00-53-10-02-CN ·

330101-00-59-15-02-CN

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330101-00-60-90-01-CN

330101-00-75-10-02-00

330101-00-75-15-02-CN

330101-00-86-10-02-00

330101-05-30-10-02-00

330101-10-32-10-02-CN

330101-23-38-10-02-00

330101-25-52-10-02-CN

330101-39-49-15-02-CN

330101-39-63-10-02-CN

330101-55-82-10-02-CN

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Proximitor

330100-50-00

330100-50-02

330100-50-CN

330100-51-00

330100-70-01

330100-90-00

330100-90-02

330100-90-CN

330101-50-02

330180-09-00

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330180-91-00

330180-91-CN

330180-90-00?

330180-90-02?

330180-90-CN???

330181-50-05

330780-05-00

330780-51-00

330780-51-CN

330780-91-00

330780-91-CN

330780-50-00

330780-50-CN

330780-90-00

330850-50-00

330850-50-CN

330860-51-06

330860-61-06

330900-70-00

330900-70-CN

330980-71-CN

330980-70-00

330980-70-CN

330980-90-05

330180-X1-00 MOD:145004-04

330180-X1-00 MOD:143416-51

330180-X1-05 MOD：143416-99

330180-X1-05 MOD：143416-99

330180-X1-CN MOD：145004-99

330180-X1-05 MOD：145004-37

330180-X1-CN MOD：145193-01

330180-X1-CN MOD:143416-02

330180-X1-CN MOD:143945-04

330180-X1-CN MOD:143416-84

1. Cable head burning

Due to the accumulation of moisture and dirt on the surface of the cable head, the ceramic sleeve of the cable head broke, and the distance between the lead wires was too small, causing flashover and ignition, resulting in the burning of the insulation on the surface of the cable head and the insulation of the lead wires.

2. Short circuit fault caused by edge damage

The protective lead sheath of power cables is damaged during installation or the insulation of the cables is mechanically damaged during operation, causing insulation breakdown between cable phases or lead sheaths. The resulting arc causes the insulation material and outer protective layer material of the cables to burn and catch fire.

3. Long term overload operation of the cable

Long term overload operation causes the operating temperature of cable insulation materials to exceed the allowable temperature for normal heating, resulting in insulation aging and drying of the cable. This phenomenon of insulation aging and drying usually occurs throughout the entire cable line. Due to the aging and drying of cable insulation, the insulation material loses or reduces its insulation and mechanical properties, making it prone to breakdown, ignition, and even multiple simultaneous fires along the entire length of the cable.

4. Cable fires caused by boundary and heat sources

The spread of fires in oil systems, the explosion of oil circuit breakers, the spontaneous combustion of coal powder in boiler pulverizing systems or coal conveying systems, the baking of high-temperature steam pipelines, chemical corrosion caused by acid and alkali, welding sparks, and other sources of fire can all cause cable fires.

5. Immersed cables experience dripping and oil leakage due to height differences

When the height difference of oil immersed cable laying is large, cable oil leakage may occur. The result of dripping is that the upper part of the cable dries up due to the loss of oil, increasing the thermal resistance of this part of the cable and causing premature breakdown of the paper insulation due to coking. In addition, due to the downward flow of oil from the upper part, space is created at the upper cable head and negative pressure is generated, making it easier for the cable to absorb moisture and causing the end to become damp. The accumulation of oil in the lower part of the cable generates significant static pressure, leading to oil leakage at the cable head. Moisture and oil leakage in cables increase the probability of failure and fire.

6. Indirect head box insulation breakdown

The middle joint of the cable joint box oxidizes, heats up, and flows glue during operation due to loose crimping, weak welding, or improper selection of joint materials; When making cable intermediate joints, the quality of the insulation agent injected into the intermediate joint box does not meet the requirements. When injecting insulation agent, there are air holes in the box and the cable box is poorly sealed or damaged, causing moisture to leak in. All of these factors can cause insulation breakdown, form short circuits, and cause cable explosions and fires.

What should I do if there is a cable explosion

(1) Cut off the power supply of the cable that caught fire. If a cable catches fire, regardless of the cause, the power should be immediately cut off. Then, based on the path and characteristics of the cable, a careful inspection should be conducted to identify the fault point of the cable. At the same time, personnel should be quickly organized to extinguish the fire.

(2) Cut off the power supply of non faulty cables in case of fire in the cable trench. When the cables in the cable trench catch fire, if there is a clear possibility of fire in the cables laid side by side in the same trench, the power supply of these cables should be cut off. If the cables are arranged in layers, first cut off the power supply of the heated cable above the fire cable, then cut off the power supply of the cable parallel to the fire cable, and cut off the power supply of the cable below the fire cable.

(3) Close the fire door of the cable trench or block both ends of the cable trench. When the cables in the cable trench catch fire, in order to avoid air circulation and facilitate rapid fire extinguishing, the fire doors of the cable trench should be closed or both ends should be blocked, and suffocation should be used to extinguish the fire.

(4) Take personal protective measures when extinguishing cable fires. Due to the large amount of thick smoke and toxic gas produced by cable fires, firefighters should wear gas masks when extinguishing cable fires. To prevent personal electric shock during the firefighting process, firefighting personnel should also wear rubber gloves and insulated boots. If a high-voltage cable is found to be grounded, firefighting personnel should comply with the following rules: do not enter within 4 meters from the fault point indoors, and do not enter within 8 meters from the fault point outdoors to avoid stepping voltage and contact voltage injuries. Injured personnel are not subject to this restriction, but protective measures should be taken.

(5) Fire extinguishing equipment used to extinguish cable fires. Extinguishing cable fires should be carried out using fire extinguishers such as dry powder fire extinguishers, "1211" fire extinguishers, carbon dioxide fire extinguishers, etc; Dry sand or loess can also be used for covering; If the fire is extinguished with water, use a spray gun; If the fire is intense and cannot be extinguished by other means, after the power is cut off, water can be poured into the cable trench to seal the fault and extinguish the fire.

(6) When extinguishing cable fires, it is forbidden to directly touch the steel armor of the cable and move the cable with your hands.