Transformer short circuit detection system and detection method

Abstract

The invention discloses a transformer short circuit detection system, which comprises an inductance detection unit, a microcontroller and a short circuit protection unit, the inductance detection unitis connected with the microcontroller, the microcontroller is connected with the short circuit protection unit, and the inductance detection unit consists of a universal meter and a calculation unit.The invention further discloses a detection method of the transformer short circuit detection system. The inductance detection unit is used for measuring the inductance of a coil in the transformer in real time and transmitting the inductance to the microcontroller, and when the inductance in the coil is instantaneously and greatly reduced, the microcontroller judges that the transformer has a short-circuit fault and drives the short-circuit protection unit to carry out short-circuit protection on the transformer.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment detection, and relates to a transformer short-circuit detection system and a detection method. Background technique [0002] Transformer is a device that uses the principle of electromagnetic induction to change AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), etc. According to the use, it can be divided into: power transformers and special transformers (electric furnace transformers, rectifier transformers, power frequency test transformers, voltage regulators, mining transformers, audio transformers, intermediate frequency transformers, high frequency transformers, impact transformers, instrument transformers, electronic transformers , reactors, transformers, etc.). [00...

AI Technical Summary

Problems solved by technology

If the transformer is short-circuited, the impedance of the coil will disappear, so that the output voltage will be 0, and the voltage of the primary coil will be zero. Since the excitation inductance and the ideal transformer are connected in parallel, the voltage of the excitation inductance will also be zero, and the excitation inductance of volt-seconds will be lost. The core can no longer be magnetized, the excitation inductance disappears, the excitation flux disappears, the primary side coil becomes a different line, the primary side voltage is all added to the leakage inductance, the current will increase sharply, and a short circuit current occurs

Once the secondary side is short-circuited, the primary side is "reflected short-circuited", the voltage relationship ratio disappears, the short-circuit current tends to be infinite, and the transformer will be burned