DC high-voltage generator DC transmission is the conversion of three-phase AC power into DC power through the converter station, and then sent to another converter station through the DC high-voltage generator DC transmission line, and is restored to the three-phase AC power transmission mode. Efficient, economical and environmentally friendly high-capacity, long-distance, low-loss transmission technology. As an ideal technology for long-distance power transmission, DC high-voltage generator DC transmission technology can smoothly transfer power from remote areas to the central area of ​​power load, especially in countries with vast areas such as China and India.
The unit series multi-level inverter has low cost, high power factor on the grid side, small current harmonics on the grid side, sinusoidal output voltage waveform, basically no distortion, high reliability, high- capacity asynchronous motor frequency conversion in DC high voltage generator The field of speed regulation has achieved a very wide range of applications. The application of the unit series multi-level frequency converter to the synchronous motor will effectively improve the reliability of the synchronous motor variable frequency speed control system, reduce the cost of the synchronous motor frequency conversion transformation, improve the efficiency brought by the energy-saving transformation, and also increase the unit series power. Flat inverters open up a vast new market. After a lot of theoretical analysis, computer simulation and physical system experiments, the key problems of synchronous motor starting step are solved.
When using a frequency converter to drive the synchronous motor, use a different starting method than the above: Before the inverter outputs voltage to the stator of the synchronous motor, before starting, the excitation device sends a certain excitation current to the excitation winding of the synchronous motor, and then the inverter outputs an appropriate voltage to the armature winding of the synchronous motor to start the motor. . The main difference between the synchronous motor and the ordinary asynchronous motor is that the angle between the armature voltage vector and the rotor pole position must be within a certain range when the synchronous motor is running, otherwise the system will be out of step. At the beginning of the motor start, the angle between the two is arbitrary, and the angle must be controlled within a certain range through a proper whole step process, and then the motor enters a stable synchronous operation state. Therefore, starting the whole step problem is a key issue for the inverter to drive the synchronous motor.
The DC high voltage generator is mainly used to detect the electrical insulation strength and leakage current of the power device, and is used for the electric power department, the power plant of the factory and the mining enterprise, the scientific research unit, the railway, the chemical industry, the power plant, etc., the zinc oxide arrester, the magnetic blow arrester, the power cable The DC high voltage test of generators, transformers, switches and other equipment is designed according to the requirements of Chinese industry standard ZBF 24003-90 "General technical conditions for portable DC high voltage generators". While the instrument is based on the national implementation standards, it is also based on the user's experience and requirements, so that the instrument is very suitable for field action, thus meeting the irregular field operation test of the power system.
The main functions of the DC high voltage generator :
1. Due to the complicated on-site environment of the power system, the instrument must be wear-resistant, anti-interference, easy to carry and anti-interference. Therefore, the components imported from the United States, Germany, Japan and other countries are used. After using and testing, the users are very satisfied. Design now.
2. When conducting on-site DC test, the measured data is judged according to the data of the instrument. Therefore, the measurement accuracy of the instrument will be very high. The voltage and current meters of the instrument are digital display, and the voltage resolution is 0.1. kV, current resolution of 0.1uA guarantees the accuracy of the instrument.
3. The instrument also adds the high-precision function of 75% VDC-1mA, so that the user does not need to perform conversion on the spot, and can directly measure it directly by pressing it, which is simple and easy to use.
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