REF543KM129AAAB ABB feeder protection and control REF543 series
Brand ABB Color Standard Application Industrial height 395mm rated current 490mA
Protection Level IP45 Suitable for motor power 116KW Application Site Power Industry BOM Number GJR2391500R1220 Power industry HIEE401782R0001 Part number REF543KM129AAAB
Applicable pipe 2 Whether imported is weighing 5.18 kg can be sold nationwide
REF543KM129AAAB ABB feeder protection and control REF543 series
2.4 Connection of ship power grid
Each frequency converter draws powerful non-sinusoidal currents from the ship’s power grid. For flexibility, power can be supplied directly to the ship’s grid via a transformer from the same bus connected to the inverter. Therefore, under the premise of using a non-sinusoidal current, the current value that causes voltage distortion in the ship’s network is usually not allowed to exceed the allowable value.
In practice, a three-winding transformer is connected in series in front of the inverter, and the rectifier is divided into two parts, in order to minimize the impact of residual high-order harmonic current on the power grid voltage, and to reduce the impedance of the ship’s power grid for high-order harmonic as much as possible.
For the generator, the subtransient reactance is a more important aspect, the lower limit value of the reactance is determined by the structural parameters of the generator, on the other hand, the smaller value also means the larger impact short-circuit current. The use of filters allows the grid impedance at a specified frequency to reach a very small value.
3. New technology and future development trend of Marine electric propulsion system
At present, the development trend of Marine electric propulsion system is mainly reflected in: replacing DC electric propulsion and AC-DC electric propulsion devices with AC electric propulsion devices, and vigorously developing superconducting electric propulsion, special fuel cell propulsion systems, and comprehensive electric propulsion systems. Ac electric propulsion device is characterized by large limit power, high efficiency and good reliability, according to the type of propulsion motor, it can be divided into asynchronous motor AC propulsion device and synchronous motor AC propulsion device.
Superconducting electric propulsion is an electric propulsion device with superconducting motor as the power component. Its technical characteristics are small mass, small volume, high efficiency and low noise. With the continuous development and improvement of cryogenic technology in recent years, it provides a good prerequisite for the application of superconducting electric propulsion.
Fuel cell is a kind of energy conversion device that can directly convert chemical energy into electrical energy. The fuel cell system is composed of the battery body, fuel, oxidizer and its storage, which is characterized by good silence and high efficiency. Because the infrastructure for large-scale hydrogen production and storage is still limited, today’s fuel cells use hydrogen primarily through methanol conversion, which is the chemical conversion of methanol into hydrogen. There is still a big gap between the energy conversion efficiency of this converted hydrogen and the working efficiency of diesel engine. So far, the cost of electricity per kilowatt of fuel cells is still much higher than that of traditional power units such as diesel engines. As mentioned above, the supply and storage of hydrogen energy has prevented the large-scale promotion and further application of fuel cells, and despite its broad application prospects, it remains an unsolved technical problem.
The integrated full electric propulsion system is a major change in the field of Marine power plant. At present, all countries are actively carrying out the research work of integrated full electric propulsion system, and have made corresponding development plans. In the driving device of the pod, the motor and one or two rotating pods are installed under the ship, and the energy is transferred to the motor through the conductive slip ring, which has a good technical application prospect.
REF543KM129AAAB ABB feeder protection and control REF543 series
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