Couplings are devices that are used to connect cables. The result is a line that is connected to various electrical installations. Couplings are quite different in parameters. Their rated voltage is on average 5 kV. End modifications are the closing link in the chain.
A conventional coupling consists of a cuff, a contact rod, and insulators. Some modifications have winding. In order to become more familiar with these devices, consider the types of couplings, as well as specific configurations.
Difference between couplings
Couplings (cable, heat-shrinkable) are a connecting link, and the circuit does not close on them. They differ in device. Models for telephone lines are used. There are also modifications for multi-core trunk cables. The cuffs of many models are installed with a cover. Contact rods are installed with different diameters. On average, the rated voltage of the device is 5 kV. It is also important to note that there are modifications that have a cabletip.
Installation of cable glands can be done in different ways. Most often this happens with the help of soldering. However, modifications with special clamping mechanisms are on the market. In this case, much depends on the size of the coupling. If we talk about the parameters, then the heating coefficient of the cores of the models fluctuates around 70%. The operating voltage at a constant frequency, as a rule, does not exceed 18 kV. The maximum temperature during short circuits averages about 140 degrees. Many couplings have a fire cover.
End Models
As mentioned earlier, cable terminations are the final link in the chain. Their difference lies in the presence of a compound. It is a lead conductor. In some cases, models use a cable lug. Insulators are most often used through-type. Also, the models use various grounding drives. In this case, the belt insulation is located near the bandage. Many couplings have a tube. The average oil pressure of the device is maintained at 220 kPa. The maximum temperature during a short circuit does not exceed 130 degrees. The rated voltage of the devices is about 5 kV. Coupling bolts or clamps are used to install the device. There are also modifications, the installation of which is carried out by soldering.
1 kV models
1 kV splices are often used to connect telephone cables. In this case, steel cuffs are used. The bodies themselves are made of cast iron. Speaking of parameters,the oil pressure of the device can withstand about 120 MPa. Tie bolts are used to connect the cores.
For trunk lines, a 1 kV cable (connecting) sleeve is not suitable. The parameter of the maximum temperature during a short circuit in the devices does not exceed 130 degrees. The tips of the models are installed behind the winding. Insulators are often used through type. Some devices have a handset. End modifications are distinguished by the presence of a compound.
5 kV models
5kV couplings are used for stranded cables. Tips in devices can be located behind the tube. In this case, the oil pressure of the model can withstand about 150 kPa. Some devices have a bandage. It is also important to note that insulators are often used as bushings. The heating coefficient of the cores is on average 75%. Models differ in installation type.
Features of 10 kV couplings
10 kV cable glands are designed for high voltage lines. Cases for models are often used cast iron type. Insulators in this case are used different. The oil pressure of the device is maintained at an average of 330 kPa. The maximum temperature during a short circuit is about 180 degrees. The contact rods of the models are located under the insulators. End modifications have a compound. The winding in the devices is steel. The operating voltage of models with variable frequency does not exceed 30 kV.
Coupling "Stp"
Cable coupling (connecting) of this type is suitable for stranded wires. The cuff of the model is lead. It is installed near the lower insulators. The winding in this case is used in various lengths. The models differ in the type of compound. On average, the maximum pressure of the device is kept at 130 kPa. The rated voltage of this coupling is 7 kV. In turn, the heating coefficient does not exceed 75%.
The operating voltage of the coupling at variable frequency is 16 kV. For installation of the device there are connecting bolts. The casing at the coupling is provided fire-resistant type. It is also important to note that the model has a ground drive. The bandage in this case is located above the winding. The cover of the model is made of cast iron.
Modifications "StpR"
Cable boxes of this type are used for terrestrial connection of high-voltage lines. The winding of the model is made of cotton ribbons. In this case, a steel cuff is installed. Insulators in the model are used only through-type. Special brackets are used to fix the device. It is also important to note that the coupling has a tip, which is located under the bandage. Directly installed compound epoxy type.
The rated voltage of the device is 1 kV. According to the documentation for the clutch, it can withstand a maximum of 210 kPa of oil pressure. The operating voltage at a constant frequency does not exceed 30 kV. The model is not suitable for a distribution cable line. Additionally, it should be noted that the device uses a firecasing.
Features of the "StpB" model
This clutch has a large contact rod. The bandage in this case is located near the insulators. The cuff of this device is steel. In turn, the body is made of cast iron. The insulators of the model are used only in the belt type. There is a special bracket for fixing the device. The cable lug in the device is installed together with the earthing drive. The rated voltage of the coupling is 5 kV. The initial heating temperature of the core does not exceed 80 degrees.
The specified device can withstand about 130 kPa oil pressure. The heating coefficient of the cores of the model is insignificant. It is also important to note that the device is often used to connect multi-core cables. The compound is missing in this case. The operating voltage at variable frequency is about 12 kV. The casing is missing in this case.
Using the "Stpo" device
These cable glands are often used in repair work on trunk lines. The casing in this case is used fire-resistant type. For installation of the device there are special clamps. The cuff of the model is provided with a lead type. Directly the contact rod is located under the tip. The wire insulator of the model is located along with the winding. It is made from cotton ribbons. In turn, the insulators are made of polyethylene. There is no bandage in this case.
The rated voltage of the coupling does not exceed 7 kV. The core heating coefficient is at the level of 80%. The operating voltage of the device at a constant frequency is 14 kV. The initial temperature of the cable cores is on average 130 degrees. It is also important to mention that the oil pressure of the system is capable of withstanding about 200 kPa.
Differences of the "PStp" model
These cable glands are designed for distribution lines. The cover in this case is used mast type. Directly plastic insulators are located under the ground conductor. The cuff at the coupling is used lead type. The contact rod has a small diameter. The cable lug is installed in the sleeve housing under the cover.
Reeling in the device is used from cotton ribbons. Directly the lead tube is located above the belt insulators. The maximum oil pressure the system can withstand is about 120 kPa. In turn, the limiting temperature during a short circuit is 180 degrees. The operating voltage at a constant frequency for the model is 15 kV. Tie bolts are provided for mounting the unit.
Couplings "PStpR"
The indicated cable end sleeve (heat-shrinkable) is designed for telephone lines. The insulators of this model are made of PVC. In this case, the cuff is installed over the contact rod. Directly the cable lug is used with a large diameter. It is also important to note that the clutch hasbushing insulators. The rated voltage of the system is at around 5 kV. The initial heating temperature of the cores does not exceed 70 degrees.
The operating voltage at constant frequency is 15 kV on average. There are no tie bolts for connecting cables in the device. Direct installation of cable boxes is carried out by soldering. Compound in this case is not provided. It is also important to note that the coupling has a bandage with a protective fire cover.
