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. The rated voltage indicator for them is on average 5 kV. End modifications are the closing link in the chain.
An ordinary coupling consists of a cuff, a contact rod, and also insulators. Some modifications have a winding. In order to become more familiar with these devices, you should consider the types of couplings, as well as specific configurations.
The difference between the couplings
Couplings (cable, heat-shrinkable) are the connecting link, and the chain does not close on them. They differ in the device. Applicable models for telephone lines. There are also modifications for multicore trunk cables. Cuffs on many models are fitted with a cover. Contact rods are installed in various 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 cable lug.
Cable sleeves can be installed in various ways. Most often this happens by soldering. However, modifications with special clamping mechanisms are on the market. In this case, a lot depends on the size of the coupling. If we talk about the parameters, then the heating coefficient of the conductors in the models fluctuates around 70%. 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 protection cover.
End models
As mentioned earlier, cable terminations are the closing 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, models use different grounding drives. In this case, the belt insulation is located near the bandage. Many couplings have a pipe. The average oil pressure of the device is maintained at 220 kPa. The maximum temperature during short circuit does not exceed 130 degrees. The rated voltage of the devices is about 5 kV. To install the device, coupling bolts or clamps are used. There are also modifications, the installation of which is carried out by soldering.
1 kV models
1 kV couplings are often used to connect telephone cables. In this case, steel cuffs are used. Directly enclosures are made of cast iron. If we talk about the parameters, the oil pressure of the device can withstand about 120 MPa. For connection of veins coupling bolts are used.
For trunk lines, a cable (connecting) coupling of 1 kV is not suitable. The parameter of the maximum temperature during a short circuit in devices does not exceed 130 degrees. Tips for 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
5 kV couplings are used for multicore cables. Tips in devices can be located behind a 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 bushing type. The heating coefficient of the cores is on average 75%. By the type of installation, the models differ.
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. Contact rods for models are located under the insulators. End modifications have a compound. Winding devices used steel. The operating voltage of the models at a variable frequency does not exceed 30 kV.
Coupling "Stp"
Cable gland (connecting) of this type is suitable for stranded wires. The cuff of the model is used lead. It is installed near the lower insulators. Winding in this case is used in various lengths. By the type of compound, the models are different. 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 a variable frequency is 16 kV. To install the device there are connecting bolts. The casing of the coupling is provided with a fire protection type. It is also important to note that the model has a grounding drive. The bandage in this case is located above the winding. The cover of the model is made of cast iron.
Modifications "StpR"
Cable glands of this type are used for ground connection of high voltage lines. The winding of the model is made of cotton ribbons. In this case, a steel cuff is installed. Insulators for the model are used only through-passage type. To fix the device, special brackets are used. It is also important to note that the coupling has a tip that is located under the bandage. The compound itself is set to an epoxy type.
The rated voltage of the device is 1 kV. According to the documentation for the coupling, it withstands oil pressure at a maximum of 210 kPa. 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 fire casing.
Features of the StpB model
This coupling has a large contact pin. The bandage in this case is located near the insulators. The cuff of this device has steel. In turn, the body is made of cast iron. The model's insulators are used only for the belt type. There is a special bracket for mounting the device. The cable lug in the device is installed with the grounding drive. The rated voltage of the coupling is 5 kV. The initial heating temperature of the core does not exceed 80 degrees.
The oil pressure specified device withstands about 130 kPa. The heating coefficient of the wires in the model is negligible. It is also important to note that the device is often used to connect multicore cables. The compound in this case is absent. The operating voltage at a variable frequency is about 12 kV. The casing in this case is missing.
Application of the device "StpO"
These cable couplings are often used for repairs on trunk lines. In this case, the casing is of a fire type. There are special locks for installing the device. The cuff of the model is provided with a lead type. Directly contact rod is located under the tip. The wire insulator of the model is located along with the winding. It is made of cotton ribbons. In turn, the insulators are made of polyethylene. The bandage in this case is missing.
The rated voltage of the coupling does not exceed 7 kV. The heating coefficient of the cores 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 system can withstand about 200 kPa.
Differences model "PStp"
These cable boxes are designed for distribution lines. The cover in this case is used mast type. Directly plastic insulators are located under the ground conductor. The sleeve cuff is of the lead type. The contact rod has a small diameter. The cable lug is mounted in the sleeve housing under the cover.
Winding in the device is applied from cotton tapes. The lead tube itself is located above the waist insulators. The maximum oil pressure the system can withstand is about 120 kPa. In turn, the limit temperature during a short circuit is 180 degrees. The operating voltage at a constant frequency for the model is 15 kV. For installation of the device coupling bolts are provided.
Couplings "PSTP"
The specified cable end sleeve (heat shrinkable) is designed for telephone lines. The insulators in this model are made of polyvinyl chloride. In this case, the cuff is mounted above the contact rod. The cable lug itself is used with a large diameter. It is also important to note that the coupling has bushing insulators. The rated voltage of the system is at around 5 kV. The initial heating temperature of the cores does not exceed 70 degrees.
Operating voltage at a constant frequency averages 15 kV. Cable tie for connecting cables to the device is missing. Direct installation of cable sleeves is carried out by soldering. The compound in this case is not provided. It is also important to note that the coupling has a bandage with a protective fire protection cover.