The bus PT is used to measure the bus voltage on the high-voltage side of the main transformer, and is used to assist in grid connection. Before starting the synchronous grid connection, the excitation system actively adjusts the terminal voltage according to the bus voltage measured by the bus PT, so that the voltage on both sides of the grid-connected switch is basically equal, which is convenient for the same period of grid connection.
PT is a voltage transformer (also known as TV), CT is a current transformer (also known as TC), simply put, PT/CT is to turn a large voltage/large current into a small voltage/current, and PT shall not be short-circuited twice during operation.
Because the impedance of PT itself is very small, the short circuit will make the secondary circuit pass a large current, so that the secondary fuse is fused, affecting the indication of the meter, and even causing the malfunction of the protection device In order to avoid the insulation breakdown between the first and secondary windings, the high voltage enters the secondary and endangers the safety of people and equipment, the secondary side must have one end grounded 5a8 T one, and the secondary side should generally be equipped with a fuse as a short circuit protection.
In operation, the CT secondary circuit shall not be opened, otherwise a high voltage will occur at both ends of the secondary winding, which may burn out the CT In order to avoid the insulation breakdown between the primary and secondary windings, the high voltage will enter the secondary time, endangering the safety of personnel and equipment.
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The bus bar is used for the internal and external electrical appliances of the distribution cabinet.
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The main components of the Wiener bus system in the distribution cabinet are composed
(1) Busbar
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