Judgment of dry-type transformer fault through the abnormality of various sounds
Dry-type transformer has noise. If the sound of the transformer is larger than normal and there is obvious noise, but the current and voltage are not obviously abnormal, it may be caused by the loosening of the internal clamp or the screw pressing the iron core, which increases the vibration of the silicon steel sheet.
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Effect of transformer on the performance of short-circuit impedance
When the transformer is running at full load, the short-circuit impedance has a certain influence on the output voltage of the secondary side. The short-circuit impedance is small, the voltage drop is small, the short-circuit impedance is large, and the voltage drop is large. When the transformer load is short-circuited, the short-circuit impedance is small, the short-circuit current is large, and the electric force of the transformer is large. The short-circuit impedance is large, the short-circuit current is small, and the electric force borne by the transformer is small.
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How to Reduce the Electromagnetic Interference of Transformer to Amplifier
The power transformer can interfere with the amplifier through the magnetic field, electromagnetic induction and circuit, and is the largest source of interference in the audio machine. Therefore, it is necessary to deal with its working state and application environment, in order to effectively avoid the interference generated by the power transformer, so that the amplifier can get excellent sound effects. I will discuss this with you below.
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How to judge the transformer accident detection and measures
Abnormal sound inside the transformer. The abnormal sound inside the transformer may be due to the following reasons: severe overload causes heavy "buzzing" sound inside the transformer; Due to poor contact or breakdown points inside, "squeaking" or "crackling" discharge sound occurs inside the transformer; Due to the looseness of some parts of the connecting shaft bolt of the transformer top cover and the fact that the transformer core is not clamped, the silicon steel sheet vibrates and will emit strong noise; when there is a grounding or short-circuit fault in the power grid, a large current flows in the winding, which will emit strong noise. When the transformer is connected with large power equipment or equipment that can generate harmonic current, the operation of the equipment may cause the transformer to make a "wah-wah" sound. Due to the resonance of the iron core, the transformer will have rough and thin noise. Excessive primary voltage and excessive current of the transformer will cause abnormal sound; due to overvoltage, winding or lead wire discharge to the shell, or iron core grounding wire disconnection, resulting in iron core discharge to the shell, all make the transformer discharge sound.
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Analysis of Iron Core in Transformer
The core is the basic absence of power transformers, consisting of core laminations, insulating parts and core structural parts. The core body is composed of magnetic steel strips with high magnetic permeability. In order to enable different windings to induce voltages proportional to the number of turns, the magnetic fluxes of the two windings are required to be equal. This requires a core made of materials with high magnetic permeability in the windings, so that all magnetic fluxes are linked in the core and the two windings as much as possible, and the magnetic fluxes linked with only one winding are as few as possible.
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Several major maintenance methods and key points of isolation transformer
Isolation transformer refers to the input winding and output winding with electrical isolation of the transformer, the isolation transformer to avoid accidental contact with the charged body at the same time, the isolation of the transformer is to isolate the primary secondary winding coil respective current. Early for European countries in the power industry, widely used in the electronics industry or industrial and mining enterprises, machine tools and mechanical equipment in the general circuit control power supply, safety lighting and indicator power supply.
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Analysis of Ordinary Faults of Micro Transformer
Micro transformer mainly refers to the following single-phase 20kva, three-phase 50kva transformer, which is characterized by small transformer shape, low cost, less line. Micro-transformers are commonly used equipment in factory electrical control systems. Today, leading transformer manufacturers have to analyze the common faults of micro-transformers.
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