As a measuring tool, the transformer is a device that distributes high current and high voltage to a low rated current and voltage. It is assumed that the current input voltage is 800A/6 kV but the device is 5A/380V. To convert. The grid has a geographical distance due to electricity generation and electricity consumption, and requires a certain voltage and current to produce electricity and transport. The electrical device is a uniform rated quantity. Here you need to convert the standard amount. If the voltage of 10,000 volts is effectively transmitted over a radius of three hundred kilometers, the voltage at the farthest end from the power generation is also much higher than the rated capacity of the device. It is necessary to convert the high voltage and large current transformer into the rated voltage and current of the device used. The set of cabinets and the specific differential pressure, flow difference between the devices are used in the transformer.
To ensure safe and economic operation of the power system, some measuring instruments must be installed to measure various electrical quantities in the circuit, such as voltage, current, power, and electric energy. We often also encounter various electrical quantities that measure higher voltages and higher currents. In order to obtain this measured value more conveniently and correctly, a transformer must be used.
(1) The high voltage is changed to a low voltage (100V), and the large current becomes a small current (5A).
(2) Electrically isolate the measuring secondary circuit from the primary circuit high voltage and high current to ensure the safety of the measuring staff and instrumentation.
(3) After the transformer is used, the instrument manufacturing can be standardized without designing the meter according to the measured voltage level and current.
(4) Use the relay protection device that takes out the zero sequence current and voltage components for the reaction ground fault
Measuring transformers are divided into two types: voltage transformers and current transformers. The principle and structure of the transformers are the same as those of ordinary small transformers. It can be used with the AC instrument to achieve the purpose of expanding the meter range, and has the following advantages:
(1) The transformer can isolate the high voltage
(2) can reduce the power consumption of the table
(3) can save equipment costs
(4) can do a multi-purpose table
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