An oil-immersed voltage transformer is a stationary device that includes two or more windings. The main task of these devices is the conversion of current. In this case, the limit frequency parameter in the circuit remains unchanged. This process takes place with the help of 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 lies in their power. However, models also have their own design features. In order to understand this issue in more detail, you should consider the design of a conventional transformer.
Transformer device
If we consider the TM series oil transformer, its device is quite simple. It contains three conclusions, and they are located at the top panel. In this case, the input contacts are of the low-voltage type. There is a grounding system at the bottom of the structure for the safe use of the transformer. Below the conclusions iscomplicated bypass valve mechanism.
The drain pipe is located at the bottom of the transformer. For ease of transportation of 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 body. Also there the user is able to find the oil level indicator. A dehumidifier is provided in some configurations of TM series transformers.
Transformer repair
In some cases, the relay winding of the device may be damaged. Repair of oil transformers in this situation must begin with an inspection of the low-voltage contacts. The protective cover can be removed directly 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 modifications, it will additionally be necessary 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 for maximum power are calculated on average 20 kVA. In this case, the operating frequency parameter of the relay reaches 55 Hz. In this case, much depends on the types of contacts. If we consider copper modifications, then their current conductivity is quite good. Overload single-phase transformers are able to withstand an average of 5 A.
The models are quite different in size. Directly filler necks, as a rule, are installed on the side panels. To change the position of the switch, there are special rollers. Grounding systems are installed at the bottom of the structure. There is a small oil drain pipe next to the transformer frame.
Difference between two-phase models
Two-phase transformers differ in that their power reaches 50 kVA. In turn, the operating frequency parameter in some modifications reaches 60 Hz. This is largely achieved by installing large relays. Switches for many models are available with a roller mechanism. Grounding systems are provided in all modifications with insulators. The input voltage of a two-phase type device is capable of withstanding an average of 15 kV. However, there are more powerful models. Dehumidifiers in the design data are mainly provided for
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 an oil-immersed three-phase transformer of the TM series produces about 500 kVA. The input voltage of the relay at the same time keeps at the level of 30 kV. Three-phase models are quite large in size.
Considering all of the above, the shipping panels they install are strong. To monitor the operation of the system, thermometers are provided, as well as oil indicators. Many configurations of three-phase transformers are equipped withdehumidifiers.
TM-25 specifications
The ТМ-25 oil transformer is produced with one relay. In this case, the power, as the name of the model implies, is 25 kVA. The input voltage of the device is capable of withstanding at the level of 25 kV. In turn, the overload parameter averages 6 A. If we talk about design features, then the filler neck of this model is located at the rear panel. Directly the drain couple is provided with a diameter of 3.5 cm.
The thermometer is used in the indicated transformer. This model also has a dehumidifier. The user is able to monitor the oil level using a special pointer. The transformer has a grounding system with an insulator. The relay in this case is installed 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 ТМ-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 setting of the relay is exactly 50 Hz. There is a current switch in this case. For easy transportation of the model, there is a plate above the frame, on which there are holes for the clutch.
Also, this transformer has a special cooler. The filler neck is located at the control panel. High-voltage contacts in this case are located at the topparts of the structure. There is no dryer in this transformer.
63 kVA transformers
Power (oil) transformers of this type can withstand a maximum voltage of 35 kV. In this case, the current load indicator is no more than 6 A. All this suggests that the operating frequency of the device does not exceed 55 Hz. High-voltage terminals in this case are located near the top panel. The switches in the devices are installed with a roller mechanism. Models have thermometers. The relays are located directly above the bottom plate near the frame. Dryers are available for these transformers. Earthing systems are provided with insulators.
Modifications for 100 kVA
100 kVA oil-immersed transformers are usually installed with dryers. In this case, the drain pipes are available in different 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 current overload rating is 6 A on average.
If we talk about relays, it is important to note that their operating frequency is on average 45 Hz. Plates above the frames are installed in various thicknesses. Switches in many models are of the roller type. At the lower frames, the grounding systems are provided with insulators. Oil gauges are standard on the control panel.
160kVA transformers
160 kVA oil-immersed 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 a maximum voltage of 30 kV. The 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 are on average maintained at a level of 6 A. Filler necks for transformers have different diameters. If we talk about modifications of the TMG series, then the width of the pipe is on average 3.5 cm. Coolers are available in all models of transformers.
250 kVA transformers
Oil-oil transformers, whose power is 250 kVA, are produced with three relays. In this case, the platforms used 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 of roller type. Directly the phase change of the models occurs very quickly. Their grounding systems are located at the bottom frame. The output voltage indicator reaches up to 15 kV in devices. The filler necks of the models are mainly located at the relay. In this case, all configurations are equipped with thermometers.
TMG modifications
Transformers of the TMG series are produced 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. Protection systems for models are available with insulators. Drain pipes are installed in different diameters. If we talk about the input contacts, then the maximum threshold voltage they can withstand is about 30 kV. While the average power rating reaches 150 kVA.
