Oil-Cooled Power Transformers, Type TMG, TMGF

 Three-phase oil-cooled power transformers, type TMG and TMGF

The UZTT Company for Transformer Technologies has its own facilities for manufacturing of oil-cooled power transformers and offers transformers of the following types:  TMG, TMGF, TM, TMZ, and TMB. Oil-cooled TMG-type power transformers have certificate of conformity No. ROSS RU.AV28.V00284.

High voltage: 10 kV or 6 kV (6.3 kV).
Low voltage: 0.4 kV or 0.23 kV.
Capacity range:  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. Step-down transformer voltage: 10/0.4 kV, 10-0.4 kV, 6/0.4 kV, 10/6 kV; step-up transformer voltage:  0.4/10 kV 0.4/6 kV, 6/10 kV.

Three-phase oil-cooled TMG/TMGF-type power transformers in hermetically sealed tanks, with 10 kV or 6 kV high voltage and 0.4 kV or 0.23 kV low voltage are used in package transformer substations (KTPN and BKTP-type) and are designed to convert electrical energy in electric power networks and for electrical energy consumers.  They have long service life; they are reliable and easy in operation. The projected service life for TMG ^TM transformers is 25 years (10,000 cycles per max and min pressure exposure).

Oil-cooled power transformers, type TMG/TMGF:

TMG-type transformers manufactured by UZTT Company 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.

Oil-cooled TMG transformers 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.
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.
The range of rated linear voltages for oil-cooled TMG transformers: 6/0.4 (TMG 6.3/0.4); TMG 10/0.4 kV or TMG 6/0.23 (TMG 6.3/0.23); TMG 10/0.23 kV;
The ambient temperature ranges from + 40°С to - 45°С in temperate or cold - from +40°С to - 60°С - climates.
Rated capacity range: TMG transformers - from 25 kVA to 2500 KVA; TMGF transformers - from 250 to 1000 kVA; TMZ transformers - from 400 to 2500 kVA.
TMG power transformers are designed for the primary winding rated voltage of 6 or 10 kV.
The rated voltage for 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.
The altitude at installation - max 1000 m.
Operating frequency: 50 Hz.

Ensure that the operation of TMG-family transformers is not adversely impacted by shaking or vibrations or chemically aggressive environment. Non-explosive environment free of current-conducting dust.

Tanks of all oil-cooled TMG power transformers have rectangular form; they are equipped with oil-cooling radiators located along the tank. The tank walls are made of ribbed 2.5-4 mm thick steel sheeting, thus ensuring reliable operation of transformers and high shell resistance to deformation during transportation by any types of transport as well as absence of residual deformations that may be caused by temporary excessive pressures up to 150 kPa (1.5 kgf/cm²) and up to 300 kPa (3 kgf/cm²) without any risk of structural destruction.

Oil-cooled TMG, TMGF, TMZ and TMB power transformers are offered in hermetically sealed configuration; their internal chamber has no outside exposure, and pressure changes inside the tank are offset by air "cushion" in the upper part of the tank. To prevent prohibitive overpressure, the TMG transformer is equipped with a pressure relief valve that is actuated at the excessive pressure of 75 kPa (0.75 kgf/cm²). The operating manual for the TMG power transformer requires that the excessive pressure inside the tank must not exceed 50 kPa (0.5 kgf/cm²). The insulation of the inner chamber of the transformer tank improves significantly oil operating conditions, preventing its humidification, oxidation and sludge formation. To monitor the oil level, TMG, TMGF, TMZ and TMB transformers are equipped with the oil-level indicator located on the wall of the tank. Even after extended storage, TMG transformers require virtually no expenses on pre-commissioning, and if operated properly, can operate for a long time without repair works that may require opening of the tank.

To localize consequences of accidents that may be cause by severe internal damage to the transformer, 400 kVA+ transformer tanks are equipped with protective pipes with built-in diaphragm valves intended for emergency discharge of oil in case of sudden increase in excessive pressure exceeding 150 kPa (1.5 kgf/cm²). With normal operation of the TMG transformer, these valves do not require any additional maintenance during entire service life. To prevent excessive pressure, the tank of the transformer with 25 to 250 kVA capacity is equipped with a safety valve. To monitor internal pressure in the tank with the relevant warning signal if allowed limits are exceeded in 100 kVA+ transformers placed indoors, (at the customer's request) transformers can be equipped with the electric-contact vacuum pressure gauge.

Tanks can be equipped with floating gauges to monitor the limit (lower) level of oil. All TMG-type transformers can be equipped with standard alcohol or electric-contact manometric thermometers for remote control over temperature to keep it within the set limits. Transformers can be equipped with electric-contact vacuum pressure gauges. The manometric signal-producing thermometer can be ordered by the customer to check temperature of the upper oil layer and control external electric circuits in TM-type transformers with capacity of 630 kVA and above.

High voltage and low voltage entrance bushings are placed vertically and are arranged in longitudinally directed parallel rows on the lid of the transformer tank for TMG and TMB transformers.

For TMGF and TMZ-type transformers, high voltage and low voltage entrance bushings are placed horizontally and are located on end (short) walls of the tank on its opposite sides. The entrance bushings have boxes, thus providing flange coupling of transformers with the relevant distribution units. At the customer's request, a cabinet can be installed on the side of HV entrance bushings in transformers. The cabinet design provides for possibility to install two cable sealing boxes. The cabinet has locks and safety signs. Low voltage entrance bushings can be placed from left to right or from right to left, depending on the specified instructions of the customer.

TMG-type transformers with 160 kVA capacity can be equipped with contact terminal clamps that are mounted on LV entrance bushings; the clamps can be offered in 2 configurations - either for bus connection or cable connection.

To make equipment easy to move, transformers with 160 kVA and above capacity (at the customer's request) are equipped with rollers.

Prices for TMG power transformers, rubles:

Structure of the symbol legend for TMG-type transformers:

TMG - H /10 U (HL) 1:
Т - three-phase transformer
   М - oil cooling with natural air and oil circulation
       G - hermetically sealed tank, no oil contact with ambient air
         H - rated capacity, kVA
           10 - HV voltage rating of the winding, kV
               U (HL)1 - climatic configuration and placement category in compliance with GOST 1515069

                   TMGF, where F - flange

Specifications for oil-cooled double-winding transformers, TMG-type:

Plates or channel bars with holes to secure the transformer on the foundation platform are welded to the tank bottom. At the customer's request, for transformers with capacity of 160 kVA and above, channel bars can be equipped with adjustable rollers that provide for longitudinal or crosswise movement of the transformer. The downside of the tank has grounding assembly and a drainage plug.

TMG transformers are transported in completely assembled form and filled up with oil.

To make an order for TMG transformers, please, fill in the DATA SHEET for oil-cooled power transformers

Other transformers:

Oil-Cooled Power Transformers, Type TM, TMF, TMB, TME
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

Russian version of Type TMG, TMF