With the advancement of LED lighting technology, this highly efficient and environmentally friendly lighting technology has entered thousands of households. When people care about the performance of LED lighting products, the electrical safety performance related to the user's personal safety has begun to be ignored. But as a power supply designer, electrical safety is one of the most important attributes beyond performance. In view of this, this article will introduce you to various tests such as withstand voltage and insulation resistance test in LED lighting.
Withstand Voltage Test The withstand voltage test is one of the main methods for testing electrical equipment, electrical equipment, electrical equipment, electrical circuits and electrical safety equipment to withstand overvoltage. There are two types of power frequency withstand voltage test and DC withstand voltage test. The test voltage of the power frequency withstand voltage test is more than double the rated voltage of the equipment under test, not less than 1000V. The pressurization time is 1 minute for equipment with ceramic and liquid as the main insulation, 5 minutes for equipment with organic solids as main insulation, 3 minutes for voltage transformers, and 10 minutes for oil-immersed power cables. Electrical equipment can be found to have local defects, moisture and aging of the insulation through the withstand voltage test.
AC withstand voltage test: 2.5 times or more of the voltage of the device under test, from the viewpoint of thermal breakdown of dielectric loss, the weakness of local free defects and insulation aging can be effectively found. Since the voltage is divided mainly by the capacitance at the alternating voltage, the insulation defects of the device can be effectively exposed.
It mainly achieves the following purposes:
Detecting the ability of the withstand voltage to be affected by the operating voltage or overvoltage;
Check the quality of insulation or repair of electrical equipment;
Eliminate damage to insulation caused by raw materials, processing or transportation, and reduce early product failure rate;
Verify the electrical clearance and creepage distance of the insulation;
Insulation Resistance Measurement Insulation resistance is the most basic insulation indicator for electrical equipment and electrical circuits. Insulation resistance refers to the resistance between two conductors separated by an insulating material. Insulation resistance is called to ensure the safety of electrical equipment. Between different conductors (different phases) of conductors, or between conductors and enclosures The insulation resistance presents a minimum requirement.
By measuring the insulation resistance of electrical equipment, the following objectives can be achieved:
Understand the insulation properties of the insulation structure. A reasonable insulation structure (or insulation system) composed of high-quality insulating materials should have good insulation properties and high insulation resistance;
Understand the quality of insulation treatment of electrical products. The insulation treatment of electrical products is not good, and its insulation performance will be significantly reduced;
Understand the moisture and contamination of the insulation. When the insulation of the electrical equipment is damp and contaminated, the insulation resistance will usually drop significantly.
Verify that the insulation is subjected to a withstand voltage test. If the withstand voltage test is performed when the insulation resistance of the electrical equipment is below a certain limit, a large test current will be generated, causing thermal breakdown and damaging the insulation of the electrical equipment. Therefore, in general, various test standards stipulate that the insulation resistance is measured before the withstand voltage test.
Grounding resistance measurement The grounding resistance is the resistance encountered when current flows from the grounding device into the earth and then flows through the earth to another grounding body or spreads to a distant place. It includes the resistance between the grounding wire and the grounding body itself, and the resistance of the grounding body and the earth. The contact resistance and the earth resistance between the two grounding bodies or the grounding resistance of the grounding body to infinity. The size of the grounding resistance directly reflects the goodness of the electrical device's contact with the "ground" and also reflects the scale of the grounding grid.
Leakage current leakage current refers to the leakage current between the metal parts with electrical insulation between the electrical parts, or between the live parts and the grounded parts, without any voltage applied by the fault. The current formed by the surrounding medium or the insulating surface is called leakage current. .
This article mainly introduces four known electrical safety detection methods for LED lighting. For an excellent LED lighting device, it is not enough to have only high performance. The design of safety is also a very important reference standard. I hope that through the introduction of this article, I can help you to further understand the knowledge of electrical detection in LED lighting.
check excessive midline current.
coupling bolts
Withstand Voltage Test The withstand voltage test is one of the main methods for testing electrical equipment, electrical equipment, electrical equipment, electrical circuits and electrical safety equipment to withstand overvoltage. There are two types of power frequency withstand voltage test and DC withstand voltage test. The test voltage of the power frequency withstand voltage test is more than double the rated voltage of the equipment under test, not less than 1000V. The pressurization time is 1 minute for equipment with ceramic and liquid as the main insulation, 5 minutes for equipment with organic solids as main insulation, 3 minutes for voltage transformers, and 10 minutes for oil-immersed power cables. Electrical equipment can be found to have local defects, moisture and aging of the insulation through the withstand voltage test.
AC withstand voltage test: 2.5 times or more of the voltage of the device under test, from the viewpoint of thermal breakdown of dielectric loss, the weakness of local free defects and insulation aging can be effectively found. Since the voltage is divided mainly by the capacitance at the alternating voltage, the insulation defects of the device can be effectively exposed.
It mainly achieves the following purposes:
Detecting the ability of the withstand voltage to be affected by the operating voltage or overvoltage;
Check the quality of insulation or repair of electrical equipment;
Eliminate damage to insulation caused by raw materials, processing or transportation, and reduce early product failure rate;
Verify the electrical clearance and creepage distance of the insulation;
Insulation Resistance Measurement Insulation resistance is the most basic insulation indicator for electrical equipment and electrical circuits. Insulation resistance refers to the resistance between two conductors separated by an insulating material. Insulation resistance is called to ensure the safety of electrical equipment. Between different conductors (different phases) of conductors, or between conductors and enclosures The insulation resistance presents a minimum requirement.
By measuring the insulation resistance of electrical equipment, the following objectives can be achieved:
Understand the insulation properties of the insulation structure. A reasonable insulation structure (or insulation system) composed of high-quality insulating materials should have good insulation properties and high insulation resistance;
Understand the quality of insulation treatment of electrical products. The insulation treatment of electrical products is not good, and its insulation performance will be significantly reduced;
Understand the moisture and contamination of the insulation. When the insulation of the electrical equipment is damp and contaminated, the insulation resistance will usually drop significantly.
Verify that the insulation is subjected to a withstand voltage test. If the withstand voltage test is performed when the insulation resistance of the electrical equipment is below a certain limit, a large test current will be generated, causing thermal breakdown and damaging the insulation of the electrical equipment. Therefore, in general, various test standards stipulate that the insulation resistance is measured before the withstand voltage test.
Grounding resistance measurement The grounding resistance is the resistance encountered when current flows from the grounding device into the earth and then flows through the earth to another grounding body or spreads to a distant place. It includes the resistance between the grounding wire and the grounding body itself, and the resistance of the grounding body and the earth. The contact resistance and the earth resistance between the two grounding bodies or the grounding resistance of the grounding body to infinity. The size of the grounding resistance directly reflects the goodness of the electrical device's contact with the "ground" and also reflects the scale of the grounding grid.
Leakage current leakage current refers to the leakage current between the metal parts with electrical insulation between the electrical parts, or between the live parts and the grounded parts, without any voltage applied by the fault. The current formed by the surrounding medium or the insulating surface is called leakage current. .
This article mainly introduces four known electrical safety detection methods for LED lighting. For an excellent LED lighting device, it is not enough to have only high performance. The design of safety is also a very important reference standard. I hope that through the introduction of this article, I can help you to further understand the knowledge of electrical detection in LED lighting.
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