Epoxy resin cast dry - type transformers

Factory production of epoxy resin dry-type transformer room with the first domestic product certification of the low-noise low-loss polemounted transformer. As the advanced design, high-quality materials, scientific formula, strict technology and high standards of detection, the product has the following characteristics: 1, high-voltage winding copper wire, low voltage winding copper wire or copper foil, glass fiber mat Filled with a vacuum, filled with epoxy resin without pouring, solidified after curing to form a cylindrical whole, high mechanical strength, partial discharge, high reliability. 2, flame retardant, explosion-proof, do not pollute the environment. Winding the glass fiber and other insulating materials with self-extinguishing characteristics, will not produce short-circuit arc, high heat resin will not produce toxic and harmful gases. 3, the coil does not absorb moisture, iron core clip has a special anti-corrosion protective layer, 100% relative humidity and other harsh environments. Intermittent operation without tide treatment. 4, anti-short circuit, high level of lightning impulse. 5, the coil inside and outside the resin layer is thin, good heat dissipation. Cooling is generally used in natural air cooling. For any level of protection of the three winding transformer, can be equipped with air-cooled system to improve short-term overload capacity to ensure safe operation. 6, low loss, energy-saving effect, economic operation, maintenance-free.

Amorphous alloy transformer into the high-speed growth market

Amorphous alloy on load tap changer transformer market into high-speed growth period Transformer is the use of electromagnetic induction principle to change the AC voltage of the device, in electrical equipment and wireless circuits, commonly used for lifting voltage, matching impedance, safety isolation. At present there are a certain number of domestic transformer manufacturers more than 1,200, can manufacture transformers, transformers, reactors, voltage regulators and supporting components and other products. In recent years, China's rapid growth in demand for electricity, power grid construction and investment in high-speed driving the power transmission equipment market demand. Large power construction funds to the transformer industry (including transformers, transformers, reactors, component manufacturers) has brought opportunities and challenges, prompting the transformer industry has been rapid development. Business Information Network data show that the first three quarters of 2011, China's transformer production of more than 1.1 billion KVA, an increase of 13.9%. With the deepening of power grid renovation project, the upgrading of power grid speed up, China's transformer production will maintain rapid growth is expected by 2015, China's transformer production will be more than 2 billion KVA. With China's energy-saving policies continue to deepen, the state encourages the development of energy-saving, low noise, intelligent distribution transformer products. High-power Amorphous Core Transformer facing the technical upgrading, upgrading the demand, the future will gradually be energy saving, materials, environmental protection, low-noise transformers replaced. Amorphous alloy transformer has both energy-saving and economy, its notable feature is a very low no-load loss, in line with national industrial policies and energy-saving power grid requirements, is the most advanced energy-saving effect, the use of cost is more economical distribution Transformer products. In solving the problem of noise, the products are generally applicable to urban and rural areas of various types.

Dry-type transformer basic operation

Under normal circumstances, the dry-type transformer load should be maintained at about 85% of rated capacity is better. substations and transformers in overload operation, we must pay attention to monitor its operating temperature: If the temperature rises to 155 ℃ (with alarm issued) that should be taken to reduce load measures (minus some of the secondary load), to ensure that dry-type transformers insulation is not influences. Dry-type transformers should be rated capacity, without affecting its life under the circumstances allows overload operation in a short time, for indoor transformers, the overload value should not exceed 20%. Winding temperature exceeds the insulation temperature of the insulation aging, thus affecting its service life is one of the main reasons leading to not work properly, so the on load tap changer transformer operating temperature monitoring and alarm control is very important. Dry-type transformer safe operation and service life, largely depends on the transformer winding insulation is safe and reliable. Despite the better moisture, but the air will be adsorbed on the insulation surface of the dust, so that along the flashover voltage decreases, the dust in the wet weather, there will be pollution flash phenomenon. Therefore, the dust should be regularly checked and check whether the discharge signs. Dry-type transformers in operation, but also pay attention to check whether the differences in sound, bus connection cable with or without abnormalities, abnormal phenomena found in time to avoid accidents. As the operating temperature is directly related to the service life of dry-type transformers, so the distribution of operational personnel should focus on inspection and maintenance of fan automatic control system, over-temperature alarm, trip system and temperature display system.

Understand the source of dry transformer noise

single phase pole mounted transformers body noise mainly silicon steel sheet magnetostrictive caused by the core vibration, silicon steel sheet joints and laminated magnetic leakage caused by leakage between the core, winding vibration, dry-type transformers. 1, the silicon steel sheet magnetostrictive noise caused by the core excitation, the direction along the magnetic field lines of silicon steel sheet size changes, and perpendicular to the size of the magnetic flux direction of the opposite changes occur. Magnetostriction causes the core to periodically vibrate as the excitation frequency changes. Since the magnetostrictive change cycle is half the power cycle, the core noise caused by magnetostriction is based on twice the power frequency. Due to the non-linearity of the core magnetostriction and the length of the magnetic flux path along the inner frame of the core, the core noise includes noise of the higher harmonic spectrum in addition to the fundamental frequency. 2, the electromagnetic noise caused by the core of silicon steel sheet at the seams and laminated between the magnetic flux leakage caused by magnetic attraction, which caused the core vibration. Because of the continuous improvement in core stacking, the core vibration caused by the electromagnetic attraction between the seams and the laminations is much smaller than the core vibration due to magnetostriction, so this noise is usually negligible. 3, magnetic flux leakage caused by winding vibration noise load current leakage current will cause the winding vibration. When the polemounted transformers rated working magnetic flux density in the 1.5 ~ 1.8T range. This vibration is very small compared to the core vibration caused by magnetostriction. But the load current leakage magnetic noise is proportional to the square of the load current, so the rated flux density of the transformer reduced to 1.4T when the following; winding vibration and silicon steel sheet magnetostriction caused by the core vibration connected.