present (sb for a job etc)
Phase shifting rectifier transformer is a special device to provide multi-phase rectifier power supply for medium and high-voltage frequency converter, especially in today's mature development of frequency conversion speed control technology, there is an urgent need for the localization of phase shifting rectifier transformer. In line with market demand, in the leading product non-encapsulated dry-type transformer technology based on the successful development of a series of multi-winding phase-shifting rectifier transformer, and has been successfully used in many projects. It adopts the principle of phase shifting of delayed triangle, through a number of different phase shifting angle of the secondary winding, can be composed of the equivalent number of phases for 9-phase, 12-phase, 15-phase, 18-phase, 24-phase and 27-phase rectifier transformer. The primary side of the transformer directly into the high-voltage grid, the secondary side of a number of three-phase windings, it is 0”, 8 (60-0)°, etc., said Yanbian delta-connected transformer secondary side of the low-voltage three-phase windings, at the same time that the low-voltage three-phase windings line voltage relative to the three-phase windings, phase-shift angle. When each phase is connected in series by n H-bridge units, 0 = 60°/n, which realizes the multiplication of inputs to form a 6n pulse-wave rectifier. In this way, if the power of each H-bridge unit is balanced, the current amplitude is the same, the theoretical input current on the online side does not contain harmonics of the order of 6n+1 or less, and the power factor can be improved, and generally do not need to be equipped with reactive power compensation and harmonic filtering devices. It is most suitable for use in environments with high fire protection requirements and large load fluctuations, such as offshore oil platforms, thermal power plants, water plants, metallurgical and chemical industries, mines and building materials, and other special working environments.
Multi winding phase shifting rectifier transformer is designed according to different users, the capacity is divided into 300, 400, 500, 600, 700, 800, 900, 1000, 1250, 1500, 1750, 2000, 2500, 3000, 3500KVA, the primary impedance is larger, the efficiency of the transformer is >98%, adopting the H class insulation system, high and low voltage winding temperature rise limit value 120K. Temperature rise limit value of 120 K. Multi-winding phase-shift rectifier transformer has various forms of appearance and structure, which can be determined according to the requirements of users, and the external dimensions can be adapted to the requirements of users' installation.
Implementation standards
QICE726《Thousand type power transformer》
GB6450~1986《Dry type power transformer》
QGB/T10228~1977《Thousand type power transformer technical parameters and requirements》
QGB/T17211~1998《Load Guidelines for Thousand-Type Power Transformers》
GB/T10237~1998《Power transformer insulation level and insulation test》
QGB4208~1993《Enclosure protection class (IP code)》
JB/T10008~1999《6~220KV class transformer sound level》
JB/T56009~1998《Thousand type power transformer product quality classification》
JB/T8636-1997《Power transformers》
Performance Characteristics
1, High mechanical strength, strong ability to withstand short circuit, safe and reliable operation;
2, low noise, small size, easy installation, maintenance-free;
3, High insulation level, small partial discharge, long product life;
4, moisture-resistant, heat shock-resistant, fire-resistant ability.
