Power transformer no-load automatic power-off device

Abstract

The invention discloses a power transformer no-load automatic power-off device. When a certain amount of load exists on the low-voltage side of a power transformer, a current mutual inductor has current, voltage signals are amplified by an audion after being rectified by a diode, a transistor is powered on, a capacitor is in short circuit, a relay does not have electricity, and a breaker does not act. When the power transformer has no load and the current mutual inductor has no current, a transistor amplifier is cut off, and the capacitor is charged through a resistor. When the voltage rises to a certain value, a field effect audion is powered on, the relay obtains electricity, a normally open contact on the relay is pulled in, a breaker trip coil is powered on, the breaker trips, a high-voltage loop is cut to supply electricity, and the transformer is out of operation. The capacitor is charged for 20-30 minutes through the resistor, the high-voltage breaker can be chosen from CG 50 or CG-100, and an oil circuit breaker and a vacuum breaker with columns of electricity control can be chosen. The power transformer no-load automatic power-off device has the advantages of improving grid security and reducing unnecessary power loss.

Description

Technical field: [0001] The invention relates to a no-load automatic power-off device for a power transformer, which is particularly suitable for use in a power supply system. Background technique: [0002] Some transformers in the distribution station area often have large horse-drawn carts, especially in rural areas where normal load occurs in irrigation and drainage areas and during irrigation seasons. No load will occur at night, rainy days and non-irrigation seasons. If not cut off in time High-voltage power supply will cause the distribution transformer to operate at no-load for a long time. For example, a 100KVA power transformer consumes 600 to 700 watts of power when running at no load. Taking a county as an example, there are 400 to 500 agricultural irrigation systems. Change the calculation, this will cause a lot of power loss. Summary of the invention: [0003] The task of the present invention is to provide a no-load automatic power-off device for power transformers ...

AI Technical Summary

Problems solved by technology

[0002] Some transformers in the distribution station area often have the phenomenon of large horses and small carts, especially in rural areas where normal loads appear in irrigation and drainage areas and irrigation seasons, and no-load phenomena occur at night, rainy days and non-irrigation seasons. If the transformer is not cut off in time High-voltage power supply will cause the distribution transformer to run without load for a long time. For example, a 100KVA power transformer will consume 600-700 watts of power when running without load. Taking a county as an example, there are 400-500 agricultural irrigation and distribution systems. variable calculation, which will cause a lot of power loss

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