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What is a lightning surge generator:
A lightning surge generator is a device capable of generating high-voltage, high-current transient pulses for simulating lightning strikes and other sudden electromagnetic disturbances to test and evaluate the tolerance and immunity of electronic equipment and power systems .
Working principle of lightning surge generator:
Lightning surge generators usually consist of a capacitor with a discharge switch and a discharge inductor. During the experiment, the capacitor is charged at a slow rate. When the capacitor is full, the discharge switch starts to conduct, so that the charge on the capacitor is released into the discharge inductor at a very fast speed, resulting in extremely high voltage and current transient pulses .
Lightning Surge Generator Application:
Lightning surge generators are mainly used in anti-interference testing and evaluation of electronic equipment and power systems. For example, electronic products need to pass a lightning surge test before production to verify whether they can work normally in a lightning environment and whether they can prevent failures caused by sudden electromagnetic interference.
What is lightning surge test:
Lightning surge test is caused by the switching transient and lightning transient of the power system; the purpose of the surge immunity test is to establish a common benchmark to evaluate electrical and electronic equipment under surge ( impact) performance.
Lightning surge test is a surge (shock) immunity test, which simulates the pulse interference caused by lightning coupling, or the start and stop of high-power equipment, power supply failure, etc., to test the power protection device of the product to absorb the surge The ability of the pulse, or the pulse interference generated by the start and stop of high-power equipment, power supply failure, etc., tests the ability of the product's power protection device to absorb surge pulses.
According to the standard IEC61000-4-5 surge immunity test general requirements Lightning surge generator simulates 1.2/50us voltage waveform 8/20us current waveform and combination wave (voltage waveform 10/700us current waveform 5/320us) over-coupling network Coupling the waveform into the circuit under test has achieved the experimental purpose. The experimental level is divided into 1, 2, 3, 4 and X levels according to the severity of the voltage. Among them, X and are open levels, and the voltage intensity corresponding to each level is shown in Table 1. The application range of the severe level depends on the environment (Unai testing lighting laboratory) and installation conditions.
Lightning surge generator surge test method:
The reason for the surge is the switching transient and lightning transient of the power system;The purpose of the surge immunity test is to establish a common benchmark to evaluate the performance of electrical and electronic equipment when subjected to surges (shocks). According to the general requirements of IEC61000-4-5 surge immunity test, the lightning surge generator simulates 1.2/50us voltage waveform, 8/20us current waveform and combination wave (voltage waveform: 10/700us, current waveform: 5/ 320us), through the coupling network, the waveform is coupled to the circuit under test, which has achieved the purpose of the test.
Lightning surge generator surge test level:
The test levels are divided into 1, 2, 3, 4 and X levels according to the voltage severity, among which X and is open level, and the voltage intensity corresponding to each level is shown in Table 1. The application scale of the strict level depends on the environment (environment subject to the possibility of surge) and device conditions, and is generally classified according to the following conditions:
Class 1: A well-maintained environment, such as a control room in a factory or power station.
Level 2: An environment with certain protection, such as a factory without interference.
Level 3: General electromagnetic interference environment, no special installation requirements for equipment, such as cable network for general installations, industrial workplaces and substations.
Level 4: Seriously disturbed environments, such as civil overhead lines, unmaintained high-voltage substations.
X level: special level, determined by the user and the manufacturer after negotiation. Which level to choose for a specific product is generally determined by the product specification.
Lightning protection test for LED lamps:
Based on standards for surge testing of lamps:
IOS 18595 Electromagnetic Compatibility Immunity of General Lighting Equipment
IOS 17626.5, IEC 61000-4-5, EN 61000-4-5 Electromagnetic Compatibility Test and Measurement Techniques Surge (Shock) Immunity Test
The requirements of the IOS18595 standard on electromagnetic immunity are applicable to lamps and related equipment, such as low-voltage power supply or battery pack-powered bulbs, accessories and lamps.
Lamp surge test requirements:
The surge test of lamps and lanterns is carried out according to IOS 17626.5, and the test levels are as follows:
1. Self-ballasted lamps and semi-lamps
Waveform data: 1.2/50us;
Test level: line-line ±0.5kV, line-ground ±1.0kV.
2. Lamps with input power ≤25W and independent accessories
Waveform data: 1.2/50us;
Test level: line-line ±0.5kV, line-ground ±1.0kV.
3. Lamps with input power > 25W and independent accessories
Waveform data: 1.2/50us;
Test level: line-line ±1.0kV, line-ground ±2.0kV.
Precautions for lightning surge generator surge test:
1. When using an oscilloscope, it is best to add an isolating transformer for power supply to avoid the lightning surge back-impact voltage. Test the oscilloscope power supply. The lightning surge backlash is generally 8% of the setting.
2. Ensure that the lightning surge generator is grounded securely.
3. The power supply of the differential probe is preferably powered by an isolation transformer to eliminate external interference to the test equipment.
4. The EUT power supply is best to use an isolating transformer for power supply, or an air switch with a large leakage protection.
5. The safety of laboratory operation is the primary position. (Lightning surge has high voltage and high current test, which is dangerous.) Try not to touch the wiring position during the test, and do not touch it when the lightning surge generator triggers the discharge. If you touch any connecting line, if there is an emergency, just press the emergency stop button, and the instrument will automatically remove the high voltage.
Fully automatic lightning surge generator (also known as lightning surge immunity test, combined wave generator, current surge generator/voltage surge generator, combined voltage and current surge generator) for evaluation The resistance of different equipment power lines and internal connection lines to high-energy transient interference caused by natural lightning induction and switching of large-capacity inductive loads provides a common basis. The equipment fully complies with the requirements of IEC 61000-4-5, EN61000-4-5 and IOS17626.5 and other standards.
SG61000-5_Lightning Surge Generator
