Product description
The 50KVA dry-type transformer is a static electrical appliance made by using the principle of electromagnetic induction. When the original coil of the transformer is connected to the AC power supply, the alternating magnetic flux is generated in the core, and the alternating magnetic general φ representation. The φ in the primary and secondary coils is the same, and the φ is also a simple harmonic function, and the table is φ=φmsinωt. According to Faraday’s law of electromagnetic induction, the induced electromotive forces in the primary and secondary coils are e1=-N1dφ/dt and e2=-N2dφ/dt. where N1 and N2 are the turns of the primary and secondary coils. From the figure, it can be seen that U1=-e1, U2=e2 (the physical quantity of the original coil is represented by the lower corner mark 1, and the physical quantity of the secondary coil is represented by the lower corner mark 2), and its complex effective values are U1=-E1=jN1ωΦ, U2=E2=-jN2ωΦ, so that k=N1/N2, which is called the transformation ratio of the transformer. U1/ can be obtained from the above equation U2=-N1/N2=-k, that is, the ratio of the effective value of the voltage of the primary and secondary coils of the transformer, which is equal to the ratio of its turns and the difference between the voltages of the primary and secondary coils is π.
50KVA dry-type transformer features:
1. The coil is wound with copper wire or foil, reinforced with glass fiber, epoxy resin is poured without filler, vacuum drying, degassing and dehumidification, high mechanical strength, short circuit resistance, and strong impact resistance.
2. The head end of the high-voltage winding and the middle tap tap are embedded with copper inserts, which has good rigidity, easy to adjust gears, and is beautiful and neat.
3. The iron core is made of high-quality grain-oriented cold-rolled silicon steel sheets, and the 45-degree full-oblique multi-step joints are stacked. The surface is covered with resin insulating coating, which is moisture-resistant, rust-proof, and noise-resistant.
4. The elastic parts are clamped between the core, the clamp and the coil to make the coil in a stable compression state to reduce noise.
5. The transformer is designed according to self-cooling, and a longitudinal ventilation channel is reserved inside the cylinder wall of the high-voltage (low-voltage) coil for overall casting, which can be equipped with a forced air cooling device (cooling fan), and the output capacity can be increased by 50% after the forced air cooling device is adopted.
6. Equipped with a thermostat, a platinum resistor (Pt100) is placed in the embedded hole at the top of the low-voltage coil. In order to monitor the temperature rise of the transformer winding, the cooling fan is automatically started and stopped, and the fault alarm, over-temperature alarm and over-temperature tripping functions are equipped to provide reliable overload protection devices for the dry-type transformer, so as to improve the safety of the dry-type transformer operation.
Enforce the standard
1. GB1094.11-2007 dry-type power transformer
2. GB/T10228-2008 Technical parameters and requirements for dry-type power transformers
3. GB1094.10-2003 Power transformer Part 3: insulation level, insulation test and external insulation air gap
4、JB/T10008-2004 6-500KV
5. JB/T56009-1998 dry-type power transformer product quality classification
50KVA dry-type transformer principle
The function of the core is to strengthen the magnetic coupling between the two coils. In order to reduce eddy currents and hysteresis losses in the iron, the core is made of painted silicon steel sheets; There is no electrical connection between the two coils, and the coils are wound by insulated copper wire (or aluminum wire). One coil connected to the AC power supply is called the primary coil (or primary coil), and the other coil is connected to the electrical appliance called the secondary coil (or secondary coil). The actual transformer is very complex, and there are inevitably copper loss (coil resistance heating), iron loss (core heating), and magnetic flux leakage (magnetic induction wire closed by air), etc., so in order to simplify the discussion, we will only introduce the ideal transformer. The conditions for the establishment of an ideal transformer are: ignoring the leakage flux, ignoring the resistance of the primary and secondary coils, ignoring the loss of the core, and ignoring the no-load current (the current in the primary coil coil of the secondary coil is open). For example, a power transformer is close to an ideal transformer when it is running at full load (the output power of the secondary coil is rated at power).
The 50KVA dry-type transformer is safe, flame retardant, fireproof, pollution-free, and can be installed directly in the load center. Maintenance-free and easy to install. It has good moisture-proof performance and can be put into operation without pre-drying after being out of operation. Low loss, low partial discharge, low noise, forced air cooling, 120% rated load operation. It has a complete temperature protection control system to provide reliable guarantee for the safe operation of the transformer. The reliability index of the product has reached the domestic advanced level.
