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Power supply for control transformers and built-in control transformers
Electrical, thermal, and mechanical safety devices and their combinations for transformers, reactors, and power sources. Independent or related fixed or portable dry-type transformers, power supply devices, including switch mode power supply devices
The design and testing of transformers, reactors, and power supply devices (including switch mode power supply devices) in terms of electrical, thermal, and mechanical safety are crucial to ensure that they do not pose a danger to users or the environment under normal use and abnormal conditions. Here are the key safety points for these devices:
1. Electrical safety
Insulation performance:
Ensure that the insulation materials of transformers, reactors, and power supply devices can withstand the rated voltage and possible overvoltage.
Verify insulation performance through withstand voltage testing (such as IEC 61180-1).
Leakage current:
Measure the leakage current of the equipment under normal working conditions to ensure that it is within the safety limit (such as IEC 60335-1).
Grounding protection:
Ensure that the connection between the grounding terminal of the equipment and the grounding metal components has a low resistance value (usually not exceeding 0.1 Ω).
Overcurrent protection:
Equipped with overcurrent protection devices (such as fuses, circuit breakers) to prevent danger caused by overload or short circuit.
2. Thermal safety
Temperature rise test:
Operate the equipment under rated load, measure the temperature rise of each component (such as winding, casing), and ensure that it does not exceed the limit specified in the standard (such as IEC 60335-1).
Overheating protection:
Equipped with overheating protection devices (such as temperature switches, thermal fuses) to prevent equipment from causing fires or damage due to overheating.
Heat dissipation design:
Ensure that the equipment has good heat dissipation performance and avoid local overheating.
3. Mechanical safety
Structural strength:
Ensure that the outer shell and internal support structure have sufficient mechanical strength to withstand mechanical stresses during normal use and transportation.
Protective design:
Design protective measures for moving parts such as fans to prevent accidental contact by users.
stability
For portable devices, ensure that they have sufficient stability to prevent tipping or sliding.
4. Safety devices and their combinations
Independent safety device:
Such as fuses, circuit breakers, temperature switches, etc., used to cut off power or limit current under specific conditions.
Combination safety device:
The combination of overcurrent protection and overheat protection ensures that the equipment can operate safely under various abnormal conditions.
5. Special requirements for dry-type transformers and power supply devices
Dry type transformer:
Ensure that the winding and insulation materials do not decompose or release harmful gases at high temperatures.
Verify its safety through heat resistance testing and flame resistance testing.
Switching power supply device:
Ensure that the electromagnetic compatibility (EMC) of high-frequency transformers and electronic components complies with standards such as the IEC 61000 series.
Verify its stability under conditions such as input voltage fluctuations and load changes.
6. Testing and Certification
Electrical safety testing:
Including voltage withstand test, leakage current test, grounding resistance test, etc.
Thermal safety testing:
Including temperature rise testing, overheating protection testing, etc.
Mechanical safety testing:
Including structural strength testing, protective design testing, stability testing, etc.
Certification requirements:
Obtain corresponding certifications (such as CE, UL, CCC, etc.) based on the target market.
Summary: The design and testing of transformers, reactors, and power supply devices (including switch mode power supply devices) in terms of electrical, thermal, and mechanical safety are key to ensuring their safety. Through reasonable design, strict safety device configuration, and comprehensive testing and certification, these devices can be ensured to operate safely and reliably under normal use and abnormal conditions.
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