The company has strong technical force, advanced production equipment, high level of product technology, testing equipment, strict enterprise management and reliable product quality. The research, design and production of isolation transformers have been for many years. The company introduces foreign advanced winding equipment and a full set of vacuum pressure immersion equipment; the winding adopts the method of winding the whole row; the transformer is vacuum immersed to make the transformer insulated. The level reaches F or H. Product performance has reached the international advanced level. The isolation transformer is suitable for AC 50Hz to 60Hz, voltage less than 1000V, widely used in lighting, machine tool electrical appliances, mechanical and electronic equipment, medical equipment, rectifiers and so on. Product performance can meet the special requirements of users.
The output and input voltage of the isolation transformer are designed as needed. There are single-phase, three-phase or multi-input and output, and there are specifications such as triangle and star, and the rated power is up to 1000KVA. At present, our company's isolation transformers and self-tapping transformers are widely used in various fields of industrial production. The isolation transformer products are suitable for various occasions where the mains voltage needs to be transformed or safely isolated, such as the import line whose rated working voltage is inconsistent with China. , CNC machining centers, printing machinery and low-voltage high-current systems.
1. With voltage conversion function (such as: △ / Yo or Yo / △ connection)
2. It has filtering anti-interference function (such as: it can remove the third harmonic interference function. It can remove odd harmonic interference.)
3. It can effectively suppress the disturbance harmonics induced by the power line and the electromagnetic pulse of lightning strikes the system.
4. It can effectively suppress the disturbance harmonics emitted by the electronic equipment of the system from entering the power distribution network and causing interference to other devices (devices and systems).
5. It can fundamentally prevent system malfunction, data loss or error caused by ground potential disturbance.
6. It can effectively prevent the lightning protection device of the building from being knocked down due to the sharp rise of the steel bar potential as a reference ground.
7. The reason why the isolation transformer is widely used in construction is that the isolation transformer is a 1 to 1 transformer. Primary 220v, secondary is also 220v. The alternating current we use is connected to the earth. There is a potential difference of 220V between the other line and the earth. People will get an electric shock when they touch. The secondary of the isolation transformer is not connected to the earth, and there is no potential difference between any two lines and the earth. People who touch any line will not get an electric shock, so it is safer. Isolation transformers are commonly used in electronic instruments with electron tubes and high operating voltages, such as tube amplifiers, oscilloscopes, etc., and can also be used to repair power supplies.
8. Characteristics of the isolation transformer at the input of the AC power supply:
a: If the third harmonic and interference signal of the power grid is serious, the isolation transformer can be used to remove the third harmonic and reduce the interference signal.
b: The isolation transformer can be used to generate a new neutral line to avoid abnormal operation of the equipment due to poor neutral line.
c: Current waveform distortion caused by nonlinear loads (such as third harmonic) can be isolated without contaminating the grid.
9. Characteristics of the isolation transformer at the output of the AC power supply:
a: Preventing the current distortion of the non-linear load from affecting the normal operation of the AC power supply and causing pollution to the power grid, and purifying the power grid.
b: Sampling at the input end of the isolation transformer, so that the distortion of the nonlinear load current does not affect the accuracy of the sampling, and obtains a control signal that can reflect the actual situation.
c: If the load is not balanced, it will not affect the normal operation of the regulated power supply.
10. Principle, structure and advantages of three-phase isolation transformer
The isolation transformer adopts a three-phase double-winding structure, which has lightning-proof and anti-interference characteristics. Each winding of the primary secondary side is divided into two coils which are wound by two layers of mutually insulated metal foil. Then there is a capacitance C between the two coils (so-called capacitive isolation transformer). Then you can use any of the following two wiring methods as needed:
1: The winding connected to the side of the three-phase four-wire system should be connected to the Z-connection.
2: The winding connected to the side of the three-phase three-wire system should be connected to a hexagonal connection.
The winding structure of these two wiring methods has the following advantages:
1. The transformer winding itself has a large parallel capacitance capacity, which can compensate the grid reactive power.
2. When the zero-sequence fundamental current or zero-sequence harmonic current of the same phase flows through the hexagonal or Z-shaped wiring winding, the current directions in the two coils of each winding are opposite. Therefore, the resultant magnetic flux generated by the current in the iron core is zero, and no zero-sequence potential or zero-sequence circulation is induced in the other winding; at the same time, the phase difference between the two coils of each phase winding is 60 degrees, three The phase difference at the multiple frequency is 180 degrees, which cancels each other in the opposite direction, and can effectively eliminate the third harmonic potential. This suppresses the most important disturbance harmonic components in the power grid.
3. This two-layer concentric winding structure, each inductor has inductance and phase-to-phase parallel capacitance, forming a large-capacity distributed self-coupling L-C cascade filter circuit. Since the diameter of each coil is slightly different, the capacitance values ??are also different, and thus a cascaded broadband resonant circuit having different resonant frequencies is formed. As long as the parameter ratios of the inductance L and the capacitance C of each side winding are properly designed and configured, it is possible to obtain an ideal effect of suppressing the harmonics without causing resonance and overvoltage and overcurrent which may occur in the capacitor. phenomenon.
4. It can completely isolate the lightning impulse electromagnetic pulse of the same phase in the three-phase power line.
5. Since the zero-sequence magnetic flux and the zero-sequence reactance are zero, the zero-sequence additional loss of the transformer is eliminated, and the energy-saving effect is obvious. And improve the sensitivity of the transformer secondary single-phase short circuit protection.
Remarks: You can customize a variety of single-phase and three-phase isolation transformers below 500V, such as single-phase AC220 to 110V, three-phase 380 to 200V, 220V, 460V and other imported equipment dedicated isolation transformers, you can customize a variety of UPS power input Isolation transformer (can solve the zero ground voltage problem very well)