Power transformer no-load automatic power-off device
A power transformer, automatic power-off technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of long-term no-load operation of distribution transformers, large horse-drawn trolleys, etc.
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[0005] The embodiment is described in detail with the above drawings. In the figure, LH is a current transformer, LB is a sensing coil, which is a component used to measure the load current change of the transformer, BG1 is a transistor amplifier, GB2 is a single crystal transistor, R1, C1, C2 It is a type ∏ filter, B1 is a power transformer, B2 is a rectifier transformer, R2 and R3 are resistors, C3 is a capacitor, J is a relay, and ZK is a circuit breaker.
[0006] When the circuit breaker ZK is closed, the transformer B1 starts to run, and the load current of the power transformer B1 is measured by the LH current transformer and the LB sensing coil. When there is a certain load on the low voltage side of the power transformer, the LH current transformer will have current. After diode D1 is rectified, the voltage signal is amplified by BG1 by R1, C1, C2∏ filters. At this time, the transistor amplifier BG1 is turned on, and the capacitor C3 (deleted for charging) is charged, so i...
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