Guide: Voltage Transformer A special transformer that can be used as a test instrument to provide relay protection. What is the principle of voltage transformer ? How does it work? Let's take a look at it~~~
First, the principle of voltage transformer - - Introduction
The voltage transformer, the English name is Potential Transformer, referred to as PT, is a transformer with iron core, used to change the voltage on the line, and convert the high voltage into a low voltage. It can be divided into electromagnetic voltage transformers and non-electromagnetic voltage transformers. It has become an indispensable type of electrical equipment for power transmission systems such as power plants and substations.
Second, the principle of voltage transformer - - structure
The voltage transformer is mainly composed of a primary winding, a secondary winding, a core and an insulation. The primary winding and the secondary winding are wound around the iron core, and the two windings are insulated from each other between the winding and the iron core. When in use, it will be connected to the primary system once, and the secondary side will be connected to the measuring instrument, relay protection, etc., as shown below:
A fuse is installed on the primary side of the voltage transformer, and the secondary side is grounded to avoid a sudden increase in current due to the short circuit of the secondary side, causing the coil to be burnt and the secondary side to be high to ground, thereby causing a safety hazard and causing an electrical accident.
Third, the principle of voltage transformer
The principle of electromagnetic induction is applied to voltage transformers. Once the voltage U1 is generated on the primary winding, a magnetic flux is generated in the core. According to the law of electromagnetic induction, a secondary voltage U2 is generated in the secondary winding, wherein the ratio of U1 to U2 depends on the primary winding and the secondary winding. The turns ratio can be used to form a voltage transformer that converts voltages in different proportions as needed.
When the voltage transformer is in operation, the primary winding is connected to the line, and the secondary winding is connected to the meter or the relay. Therefore, when measuring the high voltage, although the primary voltage is high, after the transformation, the secondary voltage is low voltage, and the direct measurement can be Ensure the safety of operators and instruments.
Extended reading
Similarities and differences between voltage transformers and transformers
Same point: both are used to change the voltage on the line
Different points: The purpose of transformer voltage is to deliver electric energy. The capacity is very large, generally in KV or MV. The voltage transformer is used to measure the voltage. It is used to measure the power supply of the relay protection device. The capacity is very small, generally in V.
The value of voltage transformers
The value of the voltage transformer is to complete its function of transforming voltage and realize its function as a measuring instrument. Then the problem comes. Can you measure the voltage without a voltage transformer? Although some low voltages can be directly measured, for high voltage, we do not allow direct measurement for safety reasons. Therefore, the voltage transformer is required first. It is converted to a low pressure in proportion and then measured.
Voltage transformer principle
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