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The secondary winding of the current transformer and voltage transformer should be grounded during use to prevent the high voltage from entering the low voltage through the transformer after the insulation of the transformer is broken down, which will injure the instrument and the user. Ground the secondary point of the transformer. , Which does not affect the normal use of the equipment, but also guarantees the safety of personnel and equipment.
In order to ensure safety, the secondary side of the current transformer must be grounded to protect the body and equipment when there is a high voltage danger on the secondary side of the current transformer.
Current transformer function
During the production process, the use of the primary equipment in the system is monitored to ensure the safe use of the power system. The current transformer usually converts the large current of the primary circuit into a secondary small current proportional to it, and finally outputs the small secondary current to the secondary instrument, relay protection, and automatic device for use. Therefore, the current transformer is the AC current source of the electrical control, regulation, measurement and protection components, and it is also the hub of the electrical secondary circuit and the primary circuit.
Why can't the secondary side of the current transformer be open? Because the secondary circuit of the current transformer is open, the secondary current disappears, and the demagnetization effect also disappears, which will cause the magnetic density in the iron core to be very high. And because the number of turns of the secondary winding is much greater than the number of turns of the primary winding, once the secondary side is open, a very high voltage will appear, sometimes as high as several thousand volts, which not only endangers the secondary side equipment, but also serious personal life. Safety.
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