Oil-Cooled Power Transformers
Oil-Cooled Power Transformers
The transformer is a static electromagnetic device that has two or more inductively coupled coils; transformers are designed to transfer electric energy from the primary alternating-current circuit to the secondary alternating current circuit by means of electromagnetic induction. The Ural Company for Transformer Technologies (UZTT) manufactures and sells oil-cooled power transformers - TM, TMG, TMZ, TMGF, and TMB.
Oil-Cooled Power Transformer: Manufacturing
The power transformer is used to transform electrical energy in electrical systems and installations designed to receive and use electrical energy.
UZTT has its own facilities for manufacturing of oil-cooled (oil-immersed) power transformers. Power transformers that are used for substations made at the UZTT factory convert alternating current of one voltage into alternating current of another voltage required for power supply of consumers. Depending on application, power transformers can be step-up or step-down transformers.
High voltage: 10 kV or 6 kV.
Low voltage: 0.4 kV or 0.23 kV.
Capacity: 25, 40, 63, 100, 160, 250, 400, 630, 1000, 1600, and 2500 kVA.
Transformer's characteristics:
Power transformers are designed for 6 kV or 10 kV rated voltage of the primary winding. The rated voltage of the secondary winding is 0.4 kV or 0.23 kV. The diagram and connection group of windings is U/Un-0 or D/Un-11.
Oil-cooled power transformers have certificate of conformity No. ROSS RU.AV28.V00284.
Oil-cooled transformers of this type operate in 6 kV or 10 kV electric networks in outdoor installations in temperate climates (configuration U1 in compliance with GOST 15150-69) and are used to decrease high voltage of the supply network to the specified consumer voltage. Transformers of TMB type are used for electric supply of electrical equipment of drilling rigs; TME transformers are mounted on excavator platforms to supply electricity to their equipment. TMF transformers are used for flange mounting.
In terms of capacity the transformers of this family are classified as:
- step-down oil-cooled transformers (from 6 kV to 0.4 kV): 16 kVA, 25 kVA, 40 kVA, 63 kVA, 100 kVA, 160 kVA, 250 kVA, 400 kVA, 630 kVA, 1000 kVA, 1600 kVA, 2500 kVA, 10/0.4 kV, 6/0.4 kV, 10/6 kV;
- step-up oil-cooled transformers, voltage: 0.4/10 kV, 0.4/6 kV, 6/10 kV.
Voltage is regulated within ± 2х2.5 % of its rated value by changing the tapping on the high voltage side through the five-step switch with the drive mounted on the transformer lid. Tap changing is performed in absence of voltage on the transformer.
Transformer capacity: 16 kVA, 25 kVA, 40 kW, 63 kVA, 100 kW, 160 kVA, 250 kW, 400 kVA, 630 kW,1000 kVA, 1250 kW, 1600 kVA, 2500 kW.
Hermetically sealed transformers; oil is protected by dry nitrogen (nitrogen cushion between the oil level and the transformer lid).
Capacity range: 250 kVA, 400 kW, 630, 1000 kW, 1600 kVA, 2500 kVA.
These transformers are used in package transformer substations, type KTP, 2KTP, BKTP, in built-in transformer substations with capacities ranging from 16, 25, 40, 63, 100, 160, 250, 400, 630, 1000, 1600 to 2500 kVA, with voltage of 10 (6) / 0.4 kV; they are used to convert electrical energy in networks of electric power systems and energy consumers.
Single-phase oil-cooled transformers, type OM, with off-load tap changing, are connected with the 50 Hz ac mains and are used to supply power to cathode protection modular packaged units in supply mains, to decrease voltage in power system networks and to supply power to other electrical energy consumers located in temperate climates (from -45° C to +40° С).
Single-phase oil-cooled transformers, type OM-0.63/6; 0.63/10; 1.25/6; 1.25/10; 2.5/6; 2.5/10, are manufactured in two options: without voltage regulation and with tapping on the LV side. Transformers are designed for indoor and outdoor installation.
The OMP transformer is offered for 6 and 10 kV voltages and with the capacity range 1.25 - 10 kVA. The transformer is designed as a single-phase double-winding monolithic unit containing coils and magnetic core.
Step-down single-phase oil-cooled transformers, type OMP, are used to provide power to cathode protection units, to convert electrical energy in power system networks, to provide power for electrical equipment of railroads (signaling and blocking systems) and other single-phase consumers.
Transformers of OL type are used to provide electric power to automatic blocking circuits of overhead lines and longitudinal power lines of railroad power supply systems. The OL-Type transformer is recommended for application at railroad sections as a step-down transformer.
Transformers are large-scale converters and are used to produce measurement information signals for electrical measuring gauges as well as protection and signaling systems in networks with insulated neutral.
Three-phase oil-cooled double-winding or three-winding transformers in hermetically sealed corrugated tanks are used in transformer substations for electric submersible oil pumps.
- Repair and inspection of all types of oil-cooled power transformers. Power transformers after stand-by (storage, pre-sale preparation)
The UZTT Company performs a complete range of operations in designing, manufacturing and mounting of package transformer substations, outdoor stand-alone packaged switching units (YAKNO), factory-assembled switchgear cells of one-sided maintenance (KSO switchgear cells), electrical panels (SCHO-70), relieving customers of the trouble of looking for, choosing and trying to achieve reconciliation between different design, manufacturing and installation companies, thus, helping its customers to decrease total project costs.
General description of transformers:
Generally, the secondary ac system can be different from the primary system in any parameters: number of phases, current and voltage values, frequency, and current (voltage) curve. Most applied in electrical installations as well as in power transmission and distribution systems are power transformers that are used to change alternating current and voltage values, while retaining frequency, number of phases and voltage/current curve unchanged.
General-purpose transformers are used in power transmission and distribution lines as well as in various electrical installations, providing the required voltage.
Special-purpose transformers have a wider range of operating characteristics and configurations. Such transformers include welding, metering, furnace and other transformers.
The standard power transformer consists of magnetic core made of ferromagnetic material and two coils located on core legs. The primary coil or winding is connected to the alternating current voltage source, while the secondary winding is connected to the consumer. The primary and secondary windings are not connected electrically with each other; the power is transferred electromagnetically from one winding to the other. The magnetic core that accommodates the primary and secondary windings serves to intensify electromagnetic coupling field between the windings.
The transformer operation is based on electromagnetic induction. The connection of the primary winding to the ac source causes current flow in the coils that, in its turn, creates varying magnetic flux in the core. This flow links with the primary and secondary windings, inducing a varying electromotive force (EMF). The primary winding has self-inductance EMF, whereas the secondary winding has mutual inductance EMF.
Transformers are invertible; one and the same transformer can be used both as a step-down and step-up transformer.
Transformers are classified:
By application - power, welding, furnace, pulse, metering and other transformers
By cooling type - air-cooled or oil-cooled transformers
By number of phases - single-phase or three-phase transformers
By magnetic circuit (the core) - shell, toroidal, bar-type, shell and bar-type transformers
By number of windings - double-winding, multiple-winding transformersTo make an order, please, fill in the DATA SHEET for oil-cooled power transformers, type TM, TG, or TSZ
Russian version of Oil-Cooled Power Transformer
- Oil-Cooled Power Transformers, Type TM, TMF, TMB, TME
- Oil-Cooled Power Transformers, Type TMG, TMGF
- Oil-Cooled Power Transformers, Type TMZ
- Oil-Cooled Power Transformers, Type OM
- Oil-Cooled Power Transformers, Type OMP
- Oil-Cooled Power Transformers, Type OL
- Oil-Cooled Power Transformers, Type NOM
- Oil-Cooled Power Transformers, Type TMPN (TMPNG)
- Dry-type Power Transformers, Type TSZ
- Three-Phase Railroad Transformer TMZH
