An oil voltage transformer is a stationary device that includes two or more windings. The main objective of these devices is the conversion of current. In this case, the limit frequency parameter in the circuit remains unchanged. This process occurs by electromagnetic induction.
It is also important to note that transformers are secondary power sources. All this suggests that they provide electricity from the network. The difference between transformers is their power. However, the models also have their own design features. In order to understand this issue in more detail, you should consider the device of a conventional transformer.
Transformer device
If we consider the TM series oil transformer, its device is quite simple. It contains three outputs, and they are located at the top panel. In this case, the input contacts are provided with a low voltage type. There is an earthing system at the bottom of the structure for safe use of the transformer. Under the terminals is a complex bypass valve mechanism.
The drain pipe is located at the bottom of the transformer. For the convenience of transporting the device, there is a special panel on which you can find holes. A roller is installed near the switch in the device. Near the input contacts is a large relay. In order to monitor the operation of the transformer, a thermometer is built into its case. Also there, the user is able to find the oil level indicator. In some configurations of TM series transformers, a dehumidifier is provided.
Transformer Repair
In some cases, the relay coil of the device may be damaged. Repair of oil transformers in this situation must begin with inspection of the low-voltage contacts. Directly the protective cover can be removed with a screwdriver. In order to get to the relay, you will need to disconnect the top plate. In this case, the switching mechanism does not need to be touched. In some versions, you will additionally need to remove the filler neck. If dark spots are visible on the winding, then the relay will have to be completely replaced.
Single Phase Modifications
Single-phase modifications to the maximum power are calculated on average 20 kVA. In this case, the parameter of the operating frequency of the relay reaches 55 Hz. In this case, a lot depends on the types of contacts. If we consider copper modifications, then their current conductivity is pretty good. Overload single-phase transformers are able to withstand an average of 5 A.
In size, the models are quite different. Directly filler necks, as a rule, are established on side panels. There are special rollers for changing the position of the switch. Grounding systems are installed at the bottom of the structure. Near the transformer frame there is a small pipe for draining oil.
The difference between two-phase models
Two-phase transformers differ in that their power reaches 50 kVA. In turn, the parameter of the operating frequency in some versions reaches 60 Hz. This is largely achieved by installing large relays. Switches on many models are available with a roller mechanism. Grounding systems are provided in all versions with insulators. The input voltage of a two-phase type device can withstand at an average of 15 kV. However, there are more powerful models. Dehumidifiers in the design data are mainly provided
Three Phase Transformers
Three-phase oil transformers are equipped with three input contacts. In this case, the operating frequency in the circuit is maintained at 70 Hz. If we talk about the power of the models, then on average the three-phase oil transformer of the TM series produces about 500 kVA. The input voltage of the relay is kept at 30 kV. In terms of size, the three-phase type models are quite large.
Given all of the above, transportation panels are installed durable. To monitor the operation of the system thermometers are provided, as well as oil indicators. Many configurations of three-phase transformers are equipped with dehumidifiers.
Characteristics TM-25
The TM-25 oil transformer is available with one relay. In this case, the power, as the name of the model shows, is 25 kVA. The input voltage of the device is able to withstand at 25 kV. In turn, the overload parameter is on average 6 A. If we talk about design features, then the filler neck in this model is located at the rear panel. Directly drain pipe is provided with a diameter of 3.5 cm.
A thermometer in the specified transformer is used. A dehumidifier is also available for this model. The user is able to monitor the oil level using a special indicator. The transformer grounding system is available with an insulator. The relay in this case is mounted above the bottom plate. There are two input contacts in the design. Redistribution of phases is carried out using a switch. It works thanks to the movement of the rollers.
Transformer device TM-40
The power of the specified transformer is 40 kVA. In this case, the output contacts can withstand a maximum voltage of 32 kV. The limit frequency parameter of the relay is exactly 50 Hz. The current switch in this case is available. For convenient transportation of the model there is a plate above the frame, on which there are holes for coupling.
This transformer also has a special cooler. The filler neck is located at the control panel. High-voltage contacts in this case are located in the upper part of the structure. There is no dehumidifier in this transformer.
63 kVA transformers
Power transformers (oil) of this type of maximum voltage are able to withstand at the level of 35 kV. In this case, the current load indicator is not more than 6 A. All this suggests that the operating frequency of the device does not exceed 55 Hz. The high voltage leads in this case are located near the top panel. The switches in the devices are mounted with a roller mechanism. Thermometers are available on the models. Directly, the relays are located above the bottom plate near the frame. Dehumidifiers for these transformers are available. Grounding systems are provided with insulators.
100 kVA modifications
100 kVA oil transformers are usually installed with dehumidifiers. In this case, the drain pipes are of various diameters. At the same time, in some modifications there are two relays. Directly high-voltage contacts are able to withstand the maximum voltage at the level of 15 kV. The average current overload is 6 A.
If we talk about the relay, it is important to note that their operating frequency is on average 45 Hz. The plates above the frames are installed in a wide variety of thicknesses. Switches in many models are roller type. The lower frames of the grounding system are provided with insulators. Oil level indicators are normally located on the control panel.
160 kVA transformers
160 kVA oil transformers are distinguished by the fact that they always have two relays. In this case, there are three input contacts in the system. They are able to withstand the maximum voltage at a level of 30 kV. Deviation from the norm can be no more than 20 V.
Phase change switches are installed on the control panels. Overloads of a device of this type withstand at an average level of 6 A. The filler necks of transformers have different diameters. If we talk about modifications of the TMG series, then the nozzle width is on average 3.5 cm. Coolers are available in all models of transformers.
250 kVA transformers
Oil transformers with a power of 250 kVA are manufactured with three relays. In this case, the platforms are quite wide. The input voltage parameter of the circuit is on average 30 kV. In turn, the system overload indicator reaches 4 A.
Switches in many configurations are roller type. Direct phase changes in models occur very quickly. The grounding system is located at the bottom of the frame. The output voltage index reaches up to 15 kV in devices. The filler neck of the models are mainly located at the relay. In this case, all configurations are equipped with thermometers.
Modifications TMG
TMG series transformers are available only in push-pull type. In this case, the relay is installed with an operating frequency of 50 Hz. Directly, the current load indicator is at around 6 A. Models have protection systems with insulators. Drain pipes are installed in different diameters. If we talk about the input contacts, then the maximum voltage threshold they can withstand about 30 kV. While the power indicator reaches an average of 150 kVA.