English Views: 0 Author: Site Editor Publish Time: 2023-01-10 Origin: Site
The function of Isolated Transfer Switch is to disconnect the circuit of no-load current. Make the equipment under maintenance have a clear disconnection point with the power supply to ensure the safety of maintenance personnel. The isolation switch cannot cut off the load current and short-circuit current without a special arc extinguishing device. , so the isolating switch must be operated only when the circuit is disconnected by the circuit breaker.
What is the use value of Photovoltaic Isolated Transfer Switch?
What is the function of Photovoltaic Isolated Transfer Switch?
What is the use value of Isolated Transfer Switch?
Photovoltaic transformers are usually boosted for transmission purposes. In utility grid distribution and transmission systems, electrical energy is generated at lower voltages and then increased to higher voltages in certain increments. During transmission, the higher voltage minimizes inductive or resistive losses in the wire. Transformers are primarily used in AC power systems to transfer electrical energy from power plants to substations and on to individual businesses, houses or loads. This energy transfer requires stepping down from the high voltage of the power plant to the commonly used low voltage of 220 volts. This voltage step-down is accomplished by using a transformer, and the rate at which the voltage drops depends on the number of turns in the transformer.
In utility-scale solar installations, the voltage is converted after the inverter for delivery to the utility grid. Transformers on solar power facilities are primarily used to step up the voltage to deliver renewable energy (RE) to the utility grid. This is one of the key components of a utility-scale solar power system. Therefore, the dedicated isolation transformer for photovoltaic power generation plays the role of step-up transmission in the entire photovoltaic power generation!
All grid-connected PV systems include a mains power transformer to provide galvanic isolation, boost voltage and transfer energy back to the utility grid. Common isolation transformers for most medium voltage solar installations have a rated capacity of 5KVA-100KVA.
The Isolated Transfer Switch is mainly used to reliably isolate the part that needs to be powered off from the live part in the high-voltage power distribution device to ensure the safety of maintenance work. The contacts of the isolating switch are all exposed in the air and have an obvious disconnection point. The Isolated Transfer Switch has no arc extinguishing device, so it cannot be used to cut off the load current or short-circuit current, otherwise the disconnection point will produce a strong It is difficult to extinguish the arc by itself, and may even cause arcing (phase-to-ground or phase-to-phase short circuit), burn the equipment, and endanger personal safety. This is the so-called serious accident of "pulling the disconnector with load". Isolated Transfer Switch can also be used to switch certain circuits to change the way the system operates. For example: In a double-bus circuit, an isolating switch can be used to switch the operating circuit from one bus to the other. At the same time, it can also be used to operate some small current circuits.
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