What to pay attention to when connecting Miniature Current Transformer

The wiring of the Miniature Current Transformer should follow the series principle: the primary winding should be connected in series with the circuit under test, and the secondary winding should be connected in series with all instrument loads. Choose the appropriate change according to the current to be measured, otherwise the error will increase. At the same time, the secondary side must be grounded to prevent damage to the insulation when the primary side is pressed into the secondary low-voltage side, which may cause personal and equipment accidents.

The secondary side is not allowed to be disconnected. When the Miniature Current Transformer works normally, the secondary side is approximately short-circuited. If it is turned on suddenly, the excitation electromotive force suddenly changes from a small value to a large value, and the magnetic flux in the iron core presents a severely saturated flat top. Therefore, when the magnetic flux passes through zero, the secondary winding will produce a very high peak wave, which can reach thousands of volts or even tens of volts, which has a great impact on the safety of crisis handlers and the insulation performance of the instrument.

In addition, an open circuit on the secondary side will cause E2 to generate hundreds of volts. If you touch it, it will cause an electric shock. Therefore, the secondary side of the Miniature Current Transformer is provided with a short-circuit switch to prevent the primary side from disconnecting. During use, once the secondary side is disconnected, the circuit load should be removed immediately and then stopped. After all the content is processed, it can be reused.

When installing the protective Miniature Current Transformer, the protection of the protective device should be cancelled as much as possible. The area to be set. If there are two sets of current transformers and the location permits, they should be placed on both sides of the circuit breaker so that the circuit breaker is within the cross protection range.

In order to reduce the damage caused by the internal fault of the generator, a current transformer for automatically adjusting the excitation device should be installed on the output side of the generator stator winding. In order to facilitate analysis and find internal faults before incorporating the generator into the system, the Miniature Current Transformer for measuring instruments should be installed on the neutral point of the generator.