Reasons for Orange Circular Cable Damage
In the vast majority of cases, the occurrence of orange circular cable faults is due to its insulation resistance decreasing to an unacceptable low level. During operation, the insulation performance will gradually decrease under the influence of working voltage and external factors. This situation usually occurs when the working conditions of the cable are not met.
Sometimes, over time, manufacturing defects that were not initially noticed may occur. The common situation is that the damage to the insulation layer is caused by mechanical effects: during excavation work, lifting rods of lifting mechanisms, soil settlement, etc. In these cases, one or more orange circular cable cores may also break. Another risk factor is the presence of couplers on the orange circular cable. In addition to the above situations, exposure to corrosive reagents contained in groundwater or entry into cable trenches from the outside may also cause damage to the cable armor layer and protective cover.
According to the damaged insulation layer, various types of short circuits may occur in three-phase orange circular cables:
One of them is short circuited to the ground;
Short circuit between two phases;
three-phase circuit.
If the insulation performance is only partially lost, the short circuit may be a short circuit or it may be caused by a transition resistance
Finding the location of damaged Orange Circular Cable - Basic Methods
Sometimes, the location of cable damage can be easily detected by the naked eye through burnt shells and cigarette ash traces. However, it is not uncommon for high-speed protection to cut off the power supply of the line in the early stages of damage, and this sign cannot be detected by the naked eye. In this case, special equipment is needed to determine the location of the damage through various methods.
1. Connect the orange circular cable to a high-frequency voltage source and use an antenna frame with headphones to listen to the cable line. At the damaged area, the signal level drops sharply.
2. It is achieved by generating periodic discharge at the damaged area, accompanied by a clicking sound effect. Locate orange circular cable defects through the ear or using acoustic receivers (stethoscopes, microphones).
3. Apply an electrical signal to the line and measure the return time of its reflection. Use a calculation formula to determine the distance from the end of the orange circular cable line to the damaged location.
4. Burn the damaged insulation gap by passing current through the generated transition resistance. In this case, the damaged area will release a large amount of heat, causing the orange circular cable insulation material to melt and burn, releasing smoke, which can be easily determined by the naked eye.
How to repair damaged Orange Circular Cable
The scope and type of cable line repair are determined based on the type of damage. The maintenance work may include the following procedures:
Repair damaged armor shields;
Repair cracks, tears, or punctures in the shell;
Install a coupling at the location of the Orange Circular Cable malfunction;
Replace damaged connectors and end couplings.
The armor cover is repaired by welding, and additional steel strips are used if necessary. The welded armor strips are coated with anti-corrosion varnish based on asphalt or polymer composite materials.
Damage to the sealing hose protective cover of the building hair dryer. The fracture is covered with PVC patches or split clamps on orange circular cables. Small holes can be sealed with PVC filling rods.
The serious damage caused by a short circuit in the magnetic core can only be restored through one way - installing a connecting coupling. If a large part of the area is damaged, a cable insert with two couplings must be made.
During installation, the coupling with the insulation layer peeled off from the orange circular cable core is connected using the sleeve included in the kit. According to the coupling type, the insulation of the connected conductor is carried out using cable paper, asphalt, or epoxy compounds. More modern coupling designs include heat shrinkable adhesive elements that form a dense sealing coating with good insulation properties when heated. From the outside, the connection point is sealed with a protective shell made of metal or PVC.
Underground Orange Circular Cable Damage - Characteristics of Search and Exclusion
The most difficult thing is to find the location of the damaged underground Orange Circular Cable line. Considering that repair requires excavation work, the accuracy of damage localization is crucial here.
When CL is located underground, multiple detection methods are usually combined. For example, using acoustic and inductive methods to determine the area to be excavated. The combination of methods can help you narrow down your search scope as much as possible. After excavation, if the damage is not obvious, you can reuse these methods and burn them.
Protect Orange Circular Cable from Damage
When laying orange circular cable lines, it is necessary to provide cable protection as specified in the design, given the given operating conditions and installation methods. The main types of protective structures include reinforced concrete trays and slabs, vertical shafts, tunnels and overpasses, metal, polymer, and asbestos cement pipelines.
When laying orange circular cables indoors, metal or plastic corrugated sleeves should be used.
Underground installation on a sand cushion can prevent damage to cable lines during soil displacement. Install in protective pipes at the intersection of orange circular cable lines and roads.
