Several Reasons for Installing Isolation Transformers in Electrical Cabinets

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1. **Safety Isolation**
- **Preventing the Risk of Electric Shock**: Energy is transferred between the primary winding and the secondary winding of an isolation transformer through electromagnetic induction, and there is no direct electrical connection. In the event of a failure of electrical equipment, such as when the equipment enclosure is accidentally electrified, the isolation transformer can cut off the electrical circuit that might be formed between the power source and the human body. For example, in some electrical equipment without a grounding system, the isolation transformer can prevent people from getting an electric shock when they touch the equipment enclosure, greatly improving the safety of operators.
- **Isolating Power Grid Interferences**: In industrial environments or complex electrical systems, the power grid may be subject to various interferences, such as lightning strikes, surges generated by the start-up and shutdown of other high-power equipment, etc. The isolation transformer can electrically isolate the electrical cabinet from these interference sources in the power grid, reducing the impact of external interferences on the sensitive electronic equipment inside the electrical cabinet and ensuring the stable operation of the equipment.

2. **Providing a Stable Power Supply**
- **Voltage Transformation and Stabilization**: The isolation transformer can transform the input voltage into an appropriate output voltage according to the requirements of the equipment inside the electrical cabinet. For example, some electrical equipment requires different working voltages such as 220V or 110V, and the isolation transformer can achieve such voltage conversions. Meanwhile, it can also stabilize the output voltage to a certain extent. When the input voltage fluctuates within a certain range, through characteristics such as the turns ratio of the transformer, the output voltage can be kept relatively stable, providing a stable power supply for the equipment inside the electrical cabinet.
- **Matching Loads and Power Sources**: The equipment inside the electrical cabinet may have different power and impedance characteristics. The isolation transformer can play a role in matching loads and power sources and optimizing the power transmission efficiency. For example, for some electronic equipment with high requirements for power quality, such as precision instruments, automated control systems, etc., the isolation transformer can adjust the characteristics of the power supply to make it better adapt to the requirements of the load and reduce the failures of the equipment caused by power mismatch.

3. **Suppressing Harmonics and Noise**
- **Reducing Harmonic Transmission**: In electrical systems, non-linear loads (such as electronic rectification equipment, frequency converters, etc.) will generate harmonics. If these harmonics are not dealt with, they will spread in the power grid and affect the normal operation of other equipment. The inductive characteristics of the isolation transformer can play a certain inhibitory role on harmonics, reducing the transmission of harmonics from the power grid side to the electrical cabinet or from the equipment inside the electrical cabinet to the power grid side, and reducing the harm of harmonics to the entire electrical system.
- **Reducing Electromagnetic Noise**: Electrical equipment may generate electromagnetic noise during operation, which can interfere with other equipment or communication lines. Through electromagnetic shielding and its own electrical isolation function, the isolation transformer can reduce the spread of such electromagnetic noise, creating a relatively quiet electromagnetic environment for the equipment inside the electrical cabinet, which is beneficial to improving the performance and reliability of the equipment.

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