#Transient voltage Surge suppression

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Transient Voltage Suppressor diode, TVS diode application, TVS diode circuit

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Diode arrays, Bidirectionnel diode, High-voltage transients, TVS diode selection

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What is a transient voltage suppressor diode, TVS surge protection diode

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USB Zener diode, Transient voltage suppression, Bidirectional TVS diode

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What is a TVS diode, transient voltage suppression diodes, TVS Zener diode

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Diode circuit, TVS zener diode, Transient voltage suppression

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[zhejiangleihaoelectric]

Lightning surge test and lightning surge protection device

 

Lightning surge test is to evaluate the performance of power supply port, signal and control port of electronic and electrical equipment when subjected to surge (impact) interference. Its purpose is to evaluate the performance of the product when the equipment is subjected to high energy surge (impact) disturbance from power lines and interconnection lines.

 

There are two types of lightning surge tests: common mode and differential mode. Therefore, the use of surge absorbing devices should take into account the corresponding conditions with the test. In order to ensure the use effect, the surge absorbing device shall be used at the inlet of the incoming line. Due to the large di/dt in the surge absorption process, no signal line and power line can pass near the device to prevent electromagnetic coupling from introducing interference into the signal and power lines.

 

In addition, the pin of the surge absorbing device should be short; The absorption capacity of the absorption device shall match the test level of the surge voltage and current.

 

The biggest feature of lightning surge test is that the energy is particularly large. Therefore, the scheme of using ordinary filter and ferrite core to filter and absorb is basically invalid; Gas discharge tubes, varistors, silicon transient voltage absorbing diodes, semiconductor discharge tubes and other special surge protection devices must be used. A common characteristic of surge suppression devices is that the impedance is different with and without surge voltage. Under normal voltage, its impedance is very high, which has no effect on the operation of the circuit; When a very high surge voltage is applied to it, its impedance becomes very low, bypassing the surge energy. This kind of device is used in parallel between the line and the reference ground. When the surge voltage occurs, it will conduct quickly to limit the voltage amplitude to a certain value. Varistors, transient suppression diodes and gas discharge tubes have different volt ampere characteristics, so the changes when surges pass through them are not recognized.

The surge protection expert Zhejiang leihao Electric Co., Ltd. Laboratory provides free sites and equipment for customers to conduct lightning surges. Professional FAE engineers are nearby to provide technical guidance and help with the selection of surge protection devices. To learn more about lightning surge protection schemes and devices, please go directly to the Leihao electronic website to consult online customer service.

[integrating-sphere]

Learn About Surge and Lightning Surge Protection

A surge, also known as a transient voltage or spike, refers to the phenomenon of voltage exceeding the normal operating voltage for a brief moment. Essentially, a surge is a rapid voltage pulse that occurs within microseconds. Common causes of surges include the startup or shutdown of heavy equipment, short circuits, power switching, and the operation of large engines. Surges can potentially cause serious damage to electrical equipment. Therefore, products equipped with surge suppression devices can effectively absorb sudden bursts of enormous energy, protecting connected equipment from harm. The use of these protective devices significantly enhances the safety and reliability of electrical equipment. Characteristics of Surges: Surges have an extremely short duration, typically ranging from nanoseconds to microseconds. When surges occur, the amplitude of voltage and current exceeds normal values by more than double. Due to the rapid charging of input filter capacitors, the peak current of surges is much greater than the steady-state input current. To address surges, power supply designs should consider limiting the surge levels that AC switches, rectifier bridges, fuses, and EMI filtering devices can withstand. During repetitive switching processes, AC input voltage should not damage the power supply or cause fuse blowing. This phenomenon usually lasts only for a few nanoseconds to milliseconds, but its voltage and current values significantly exceed normal operating levels. Surges are widespread in distribution systems and can be considered ubiquitous. The main manifestations of surges in distribution systems include: • Voltage fluctuations: Machines and equipment automatically stop or start under normal operating conditions. • Interference with electrical devices: For example, air conditioners, compressors, elevators, pumps, or motors. • Abnormalities in computer control systems: Frequent inexplicable resets. • Frequent replacement or rewinding of motors. • Shortened lifespan of electrical equipment: Reduced lifespan due to faults, resets, or voltage issues. Surges can affect sensitive electronic devices in several ways, including: Damage: • Voltage breakdown of semiconductor devices. • Destruction of metalized layers on components. • Damage to printed circuit board traces or contact points. • Damage to bidirectional thyristors/triacs, etc. Interference: • Equipment lock-up, thyristor or bidirectional thyristor loss of control. • Partial damage to data files. • Errors in data processing programs. • Errors and failures in data reception and transmission. • Unexplained malfunctions, and more. Premature Aging: • Components aging prematurely, significantly reducing the lifespan of electronics. • Decreased output audio and visual quality. Sources of Surges: Surges can originate from both external and internal sources. Approximately 20% of surges come from external sources, primarily lightning and other system impacts. About 80% of surges come from internal sources, mainly the impact of internal electrical loads. Surge generator_SG61000-5 External surges mainly originate from lightning and include: Direct lightning strikes: Direct hits on lightning rods, lightning conductors, buildings, or refinery towers. Electromagnetic radiation from lightning: Strong magnetic fields radiate from the lightning strike point, damaging microelectronics even if the strike does not hit a building directly. Lightning-induced currents in power and signal lines. Lightning induction: Strong alternating magnetic fields form around the lightning discharge, inducing voltage on nearby metal conductors. Lightning-induced high local potentials. Lightning intrusion: Direct lightning strikes on power lines or down conductors can cause lightning overvoltages on power lines and strong electromagnetic pulses around power cables. These induced overvoltages can propagate to the input ports of equipment, causing equipment malfunction or damage. Internal surges mainly result from switching operations of electrical equipment within the power grid and other factors, including: Switching in and out of high electrical loads, such as air conditioners, compressors, pumps, or motors. Switching in and out of inductive loads. Switching in and out of power factor correction capacitors. Short circuit faults. Mechanical contacts: Mechanical switches including relay switch contacts, push-button switches, key switches, potentiometers with switches, etc. According to IEEE definitions, surges can be classified into several categories: • Pulse-type surges: Voltage ranges from several hundred volts to 20,000 volts within microseconds. • Oscillatory surges: Voltage ranges from several hundred volts to 6000 volts within microseconds to milliseconds. • Burst-type surges: Peak voltage or current of repetitive cycles. To protect electronic equipment from lightning surges, relevant immunity test standards have been established. The national standard for lightning surge immunity tests for electronic equipment is GB/T17626.5 (equivalent to international standard IEC61000-4-5). This standard mainly simulates various situations caused by indirect lightning strikes, including: • Lightning strikes on external lines, generating large currents flowing into external lines or ground resistors, resulting in interference voltage. • Induced voltage and current from indirect lightning strikes (such as inter-cloud or intra-cloud lightning) on external lines. • Strong electromagnetic fields formed around objects adjacent to lightning strikes, inducing voltage on external lines. • Lightning strikes near the ground, where ground currents introduce interference through the common ground system. Additionally, the standard simulates interference introduced by switching actions in substations (voltage transients during switchgear operations), such as: • Interference generated when switching main power systems (e.g., switching capacitor banks). • Interference from minor switch toggling within the same power grid. • Interference from thyristor equipment with resonant circuits. • Various systematic faults, such as short circuits and arcing faults between equipment grounding networks or ground systems, are also simulated. The standard describes two types of waveform generators: • Waveforms induced on power lines: Narrow surge waveforms (50µs) with steep fronts (1.2µs). • Waveforms induced on communication lines: Broad surge waveforms with gentle fronts. Simulated lightning pulses induced in power lines due to lightning strikes or surge pulses caused by lightning discharge through common ground resistance. Typical parameters include open-circuit output voltage (0.5 to 6 kV), short-circuit output current (0.25 to 2 kA) for different test levels, internal resistance (2 ohms), and additional resistances (10, 12, 40, 42 ohms) for various test levels. Surge output polarity can be positive/negative, and surge output can be synchronized with the power supply with a phase shift of 0 to 360 degrees. Repetition frequency should be at least once per minute. Severity Levels of Lightning Surge Immunity Tests: • Level 1: Good protection environment. • Level 2: Environment with some protection. • Level 3: Ordinary electromagnetic interference environment, without specified special installation requirements for equipment, such as industrial workplaces. • Level 4: Environment with severe interference, such as civilian overhead lines or unprotected high-voltage substations. • Level X: Determined by agreement between the user and the manufacturer. Read the full article

[axisindiaelectricals]

Safeguarding Your Electrical Systems with 3-Phase Surge Protectors

Introduction: 3-phase surge protectors are essential components in industrial and commercial electrical systems, designed to protect equipment and machinery from voltage spikes and transient surges that can cause damage, downtime, and safety hazards. In this article, we delve into the significance of 3-phase surge protectors, their functionality, key benefits, considerations for installation, and factors to keep in mind when selecting these critical devices.

Significance of 3-Phase Surge Protectors:

Voltage Regulation: 3-phase surge protectors help regulate and stabilize voltage levels in electrical systems, ensuring consistent power supply to sensitive equipment.

Equipment Protection: By diverting excess voltage and transient surges to the ground, these protectors safeguard machinery, control systems, and other devices from damage caused by electrical disturbances.

Safety: Ensuring the safety of personnel and preventing fire hazards by mitigating the risks associated with electrical surges and spikes in 3-phase systems.

Functionality of 3-Phase Surge Protectors: 3-phase surge protectors operate by detecting voltage spikes and diverting the excess energy to the ground, thereby protecting connected equipment from damage. These devices typically consist of metal oxide varistors (MOVs) or gas discharge tubes that act as voltage-limiting components to suppress surges and maintain the integrity of the electrical system.

Key Benefits of 3-Phase Surge Protectors:

Enhanced Equipment Lifespan: Protecting equipment from voltage fluctuations and surges can extend its operational lifespan and reduce maintenance costs.

Improved System Reliability: By minimizing downtime and equipment failures caused by electrical disturbances, 3-phase surge protectors enhance the overall reliability of electrical systems.

Cost Savings: Investing in surge protection can lead to cost savings by preventing costly repairs or replacements of damaged equipment due to voltage spikes.

Compliance: Meeting regulatory standards and safety requirements by incorporating surge protection devices into 3-phase electrical installations.

Considerations for Installation of 3-Phase Surge Protectors:

System Capacity: Ensure that the surge protector is rated to handle the maximum current and voltage levels of the 3-phase system to provide effective protection.

Location: Install surge protectors at critical points in the electrical distribution system to safeguard sensitive equipment and ensure comprehensive protection.

Grounding: Proper grounding of the surge protector is essential for effective dissipation of excess energy and ensuring the safety and integrity of the electrical system.

Maintenance: Regular inspection and maintenance of surge protectors are crucial to ensure their continued functionality and reliability in protecting equipment.

Professional Installation: Engage qualified electricians or technicians to install 3-phase surge protectors correctly and in accordance with manufacturer guidelines to maximize their effectiveness.

Factors to Consider When Selecting 3-Phase Surge Protectors:

Voltage Rating: Choose surge protectors with voltage ratings compatible with the 3-phase electrical system to ensure optimal protection.

Response Time: Consider the response time of the surge protector, as faster response times offer better protection against transient surges.

Clamping Voltage: Select surge protectors with appropriate clamping voltages that limit the peak voltage levels to safe thresholds during surges.

Durability and Reliability: Opt for surge protectors from reputable manufacturers known for producing durable and reliable devices that can withstand repeated surges.

Warranty and Support: Look for surge protectors that come with warranties and reliable customer support to address any issues or concerns that may arise during use.

In conclusion, 3-phase surge protectors play a vital role in safeguarding industrial and commercial electrical systems from voltage spikes and transient surges, thereby protecting equipment, ensuring system reliability, and enhancing safety. By understanding the functionality, benefits, installation considerations, and factors to consider when selecting these devices, organizations can effectively mitigate the risks associated with electrical disturbances and ensure the continued operation and longevity of their critical equipment and machinery.

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What is a transient voltage suppressor diode, TVS surge protection diode

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[maxxreese]

What Are Lightning Surge Protection Devices?

Surge protection refers to protecting systems and electrical devices against excessively high voltage peaks, such as those caused by lightning strikes. It protects electrical installations and equipment from electrical surges and transient voltage.

When a discharge current passes near electrical cabling, inductive effects can cause transients to be induced onto cables. This is particularly prevalent on overhead cables carried long distances between poles or towers. It is common for electrical devices to be connected to power and signal cables that run through conducting trays, ducting, or carried via overhead cables to be affected. The longer the cables, the higher the likelihood that high voltage transient will be caused through coupling effects. This makes distantly located devices used for control and monitoring in remote locations particularly vulnerable to such events.

Transients induced onto power or signal cables due to EMI and magnetic/capacitive coupling effects are relatively straightforward to protect against. Lightning Surge Protection Devices can counter such transients.

When selecting Lightning Surge Protection Devices, remember that unit price is related to performance. Always consider the value of the protected device when calculating the budget for the protective elements.

Some of the UL-listed Lightning Surge Protection Devices by LEC are:

The FG300K Series, FG225K Series, and FGB220K Series are high-performance UL 1449 Listed Type 1 SPDs designed for critical panels located in the harshest environments. The Surge Protection Device (SPD) achieves the highest UL performance ratings for the Nominal Discharge Current (In) and High Current (SCCR) tests while providing a low Voltage Protection Rating (VPR).

The LEC TE-POE-A is a surge protection device for data circuit protection. It offers surge protection on category 6 Power-Over-Ethernet applications for loads up to 0.75 amps. This device helps to protect critical video, security, and computing equipment from damaging surges, transients, and circulating ground currents.

Data Line Protector (DLP) is the state-of-the-art series/hybrid surge protection and suppression for low voltage data lines, available in a range of configurations for telecom lines, control lines, and more to prevent lightning damage and provide surge protection.

LEC's design tools contain everything you need to keep up with new technology. Talk to us today to find out how we can protect your business from lightning surges and transients.