Single-phase 220V to three-phase 380V inverter adopts AC-DC-AC circuit structure and uses SPWM modulation control technology to convert ordinary single-phase 220V to industrial three-phase 380V. It is suitable for three-phase asynchronous motors with an output phase angle of 120 °, which fully meets the motor use standards and is suitable for various types of motor loads. The single-phase power transformer three-phase power inverter solves the inconvenience caused by the three-phase power limitation in some areas, and also solves the needs of users who cannot apply for three-phase power due to site constraints.
3.1 Technical characteristics:
· 220V input for ordinary city power, eliminating the tedious procedures of applying for three-phase power, various labor costs, and various hidden costs
· The output uses industrial three-phase power, but it is charged according to civilian single-phase power, which is economical.
· The core components are imported devices, with stable performance and long service life.
· Safe and reliable, the input single-phase power is completely electrically isolated from the output three-phase power
· Wide input voltage range design to adapt to the working environment where the mains voltage is low in all regions
Complete output protection function, with multiple protections such as over-voltage, overload, over-temperature, short-circuit, over-current, etc.
Fourth, the inverter installation environment requirements
4.1 Electrical use conditions Prevent electromagnetic interference. Due to the rectification and frequency conversion of the inverter, a lot of interference electromagnetic waves are generated around the inverter. These high-frequency electromagnetic waves have some interference with nearby instruments and instruments. Therefore, the instrument and electronic system in the cabinet should use metal shells to shield the inverter from interference with the instrument. All components should be reliably grounded. In addition, the connection between electrical components, instruments and meters should be shielded control cables, and the shielding layer should be grounded. If the electromagnetic interference is not handled properly, the entire system will often be inoperable and the control unit will malfunction or be damaged.
4.2 Ambient temperature: The ambient temperature of the inverter refers to the temperature near the section of the inverter. Because the inverter is mainly composed of high-power power electronic equipment that is susceptible to temperature, the life and reliability of the inverter depend on the temperature to a large extent, generally -10 ℃ ~ +40 ℃. In addition, the heat dissipation of the inverter itself and the extreme conditions that may occur in the surrounding environment need to be considered. Generally, there is a certain margin for the temperature.
4.3 Ambient humidity: The relative humidity requirement of the inverter to its surrounding environment is not more than 90% (no condensation on the surface).
Vibration and shock: During the installation and operation of the inverter, care must be taken to avoid vibration and shock. To avoid loose solder joints and parts of the internal components of the inverter, causing serious electrical faults and even short circuits. Therefore, it is generally required that the vibration acceleration of the installation site is limited to 0.6 g or less, and special places can be added with anti-vibration measures such as anti-vibration rubber.
4.4 Installation place: The maximum allowable output current and voltage of the inverter are affected by its heat dissipation capacity. When the altitude exceeds 1000 m, the inverter’s cooling capacity will decrease. Therefore, the inverter is generally required to be installed below 1000 m above sea level. Abnormal environmental conditions, such as exposure to excessive dust, altitude> 1000 m, etc., require special selection Structural or protective parts.
4.5 Inverter storage: In practice, the inverter is generally installed on the field equipment or installed nearby. If the site environment is poor (high temperature, humidity, dust), the inverter can be placed in the power supply under the conditions allowed by the operation. Control room. When the operator is placed on site, for the safety of the inverter, the general ambient temperature should be -10 ℃ ~ + 50 ℃. When it is used in the open air, such as oil fields, offshore oil wells, mines, etc., the winter temperature should be lower than -10 ° C, you can use an electric heater to heat it, and place the inverter in an external box; in summer, the ventilation can be enhanced when the temperature is above + 50 ° C, Insulation coating is applied to the outside of the box to reduce radiation and heat conduction. According to the actual situation on the scene, according to local conditions, artificially try to improve the environment and ensure safety. For harsh environments such as dust and fiber on site, the inverter should be placed in a box, and a filter screen should be installed at the air inlet and outlet to periodically clean and strengthen maintenance.
· Boost inverter is a capacitor booster. For the load, it is used for light-loaded sites under 22kw. In the selection, the light-duty motor is selected by a large-level inverter, and the heavy-duty field is selected by a large-level inverter. Inverter.
· Boost inverter can only be used in three-phase asynchronous motors, not as a power source.
· Boost inverter is not suitable for the site that needs quick start and stop, and occasions with potential energy load