Before we get to the oil-invasive transformers, let's get to know what the transformers are. The so-called transformer is a device for altering current voltage through the use of physical electromagnetic induction principles, consisting of these elements: primary wires, iron hearts, sub-circles. Its main functions are resistance to transformation, isolation, voltage, voltage conversion, etc. The following is an introduction to the oil-invasive transformers brought to you by a minor. The oil-impregnated transformer is a structural type of transformer, where the transformer's wire is immersed in oil。
The oil-impregnated transformers are generally installed in separate transformer rooms or outdoors because of fire-proofing requirements, with large size, low cost, simple maintenance, high heat dispersion, high overload capacity and adaptation to a wide range of environmental characteristics. Oil-impregnated transformers are in operation, the heat of the round-group and the iron core is passed on to the oil, then to the cooling medium, the oil-impregnated transformer equipment is used as oil as the main insulation of the transformer to connect the two-tier grids, and the oil-impregnated transformer is used extensively in large-scale mechanical manufacturing such as power plants, steel plants, railways, and the oil-impregnated transformer equipment is used as a cooling medium. It applies to the electrical systems of industries and enterprises such as petrochemicals, electricity, swirling, metallurgical, mechanical, construction materials, coal, mines, urban construction, civil aviation, ports, etc., as a rated frequency of 50hz, with a rated capacity of 30-1600 kva, high pressure side rated voltage of 10kv and low pressure side rated voltage of 0. 4 kv distribution。
Analysis of oil-impregnated transformers
The circuits of the oil-impregnated transformer are immersed in transformer oil, the insulation medium is oil, cooling is by the means of self-cooling, wind cooling and forced oil cycle cooling, the oil-impregnated transformer has the advantage of cooling, meeting large capacity, gas relays can reflect the failure of the circuitry in a timely manner, ensuring the stable operation of the system, deficiencies are frequently observed, attention is paid to changes in the level of oil, the absence of oil is a dangerous matter, the effect of the transformer oil is cooling and insulation, if the absence of oil-impregnated transformer equipment has the effect of not being able to monitor oil levels, oil colours, increase oil and air exposure, the oil-impregnated transformer allows oil to be oxidized, humid, reduce the insulation capacity of oil, affect insulation intensity of the insulation between groups, around groups to the ground, create vulnerability to insulation, and make the oil cycle abnormal, warm, and insilence。
Performance of oil-impregnated transformers:
1 the oil-impregnated transformer low-pressure circuits, except for the use of copper guidance in small volumes, are generally cylindrical
High pressure circuits employ multi-layered cylinder structures that provide a balanced distribution of around groups, with small leakages, high mechanical strength and high resistance to short circuits。
3. The iron heart and the congested group each used tight measures, and the rigid parts of the body height and low-pressure lead were equipped with self-locked pine nuts, employing a no-heart structure and capable of withstanding transport shocks。
4. Conics and iron cores use vacuum drying and transformer oils use vacuum filtering and oil injection processes to minimize the tide within transformers。
5. The oil tank uses beam blades, which have a breathing function to compensate for changes in the size of the oil caused by temperature changes, so the product does not have storage tanks, which clearly reduces the height of the transformer。
6. Deterioration of the insulation performance as a result of the replacement of the storage tanks with the transformer oil, which effectively prevents the entry of oxygen and water。
7. Based on the performance of the above five points, the oil-impregnated transformers are guaranteed that they do not need to be replaced in their normal operation, significantly reducing the cost of maintenance of transformers while extending their useful life。
Characteristics and parameters of oil-impregnated transformers:
High reliability, advanced performance and sound economic indicators。
2. Iron cores use a three-tiered sew in a stairwell, with a surface coating of solid paint to reduce wear and tear and noise。
3. New circuit structure, well-designed oil lanes, new insulation structures, increased mechanical strength and short-circuit resistance。
4. Tanks are diverse, aesthetic and generous. Working parameters: enter output voltage: (as required) quantified working frequency: 50hz/60hz resistance strength: 2. 5 kv / 60s insulation resistance: > 20m / dc500v insulation level: a, 105°c cooling mode: cooling mode: oil mode: separation: /y (other wiring methods need to be specified when ordering) volume range: 10 kva-2000 kva oil leaching transformer conditions
1. Levels not exceeding 1,000 m inside or outside households
2. Maximum ambient temperature + 40°c maximum daily average temperature + 30°c
3. Maximum average annual temperature +20°c minimum temperature - 25°c
Operation on request under special use conditions
Note of oil-impregnated transformers:
1. The amount of oil immersed transformers above 2,500 kg and the quantity of oil between 600 kgg-2500kg charged electrical equipment shall not be less than 5 m。
2. When the distance between fire protection units adjacent to the two oil-impregnated transformers does not meet the requirements, a fireproof wall or a fireproof water curtain shall be installed on the top of the firewall. Only firewalls or firewater curtains may be installed between single-phase oil-impregnated transformers。
3. Firewalls shall be used when the outer wall of the plant is less than the outer edge of the oil-impregnated transformer equipment. The wall should not be less than 0. 8 m from the outer edge of the transformer。
No doors, windows or holes shall be opened when the outer wall of the plant is within 5 m from the external edge of the oil-impregnated transformer equipment, below the horizontal line of the total thickness of the transformer plus 3 m plus 3 m from each side; the door and fixed window on the firewall outside its scope shall not be less than 0. 9h。
5 when oil-impregnated transformer equipment and other oil-filled electrical equipment contain single oils above 1000 kg, pits and public reservoirs shall be set up. 6. Oil-impregnated transformers shall set up fire suppression systems such as fixed water sprays in accordance with the relevant existing regulations. The transformer at the oil immersion plant shall be placed in a separate room, the door of which shall be an outer level b fireproof door and shall be open directly outside the house or in the corridor and shall not open to other rooms。
