Surge Protection Device——Protect life and property

Surge protector, is a kind of electronic equipment, instrumentation, communication lines to provide security protection for electronic devices. When the electrical circuit or communication line due to external interference suddenly generated spike current or voltage, the surge protector in a very short period of time conduction shunt, so as to avoid the surge of other equipment in the loop damage.

Surge protector for a variety of power supply systems, the protection of indirect lighting and direct lightning or other transient overvoltage protection for residential, tertiary industry and industrial surge protection requirements.

Surge is the instantaneous overvoltage beyond the normal operating voltage. Essentially, a surge is a violent pulse that occurs in just a few millionth of a second, and the cause of the surge is heavy equipment, short circuit, power switch, or large engine. And products containing surge blocking devices can effectively absorb the huge energy of the burst to protect the connected equipment from damage.

Lightning disaster is one of the most serious natural disasters, the world every year due to lightning disasters caused by casualties, property losses countless. With the electronic, microelectronics integrated equipment, a large number of applications, lightning over-voltage and lightning electromagnetic pulse caused by the system and equipment damage more and more. Therefore, as soon as possible to solve the building and electronic information system lightning disaster protection is very important. With the increasingly stringent requirements for lightning protection, the Surge protection device (SPD) suppresses surge and transient overvoltages on the line. Overcurrent on the bleed line becomes an important part of modern lightning protection technology The

Lightning characteristics

Lightning protection includes external lightning protection and internal lightning protection. The main function is to ensure that the building body from the direct impact of the invasion of lightning, will be hit by the lightning protection, lightning protection, Building lightning through the lightning rod (belt, network, line), cited off the line and other events into the earth. Internal lightning protection, including lightning protection, line surges, ground potential counter attack, lightning invasion and electromagnetic and electrostatic induction measures. The method is the use of equipotential bonding, including direct connection and indirect connection through the SPD, the metal body, equipment lines and the earth to form a conditional equipotential body, due to lightning and other surge caused by internal facilities shunt and induction Of the lightning current or surge current into the earth, so as to protect the safety of personnel and equipment within the building.

Lightning is characterized by very fast rise in voltage (within 10μs), high peak voltage (tens of thousands to millions of volts), large current (tens to hundreds of Killian), shorter maintenance times (tens to hundreds of microseconds ), Transmission speed (to the speed of light transmission), the energy is very large, is the surge of the most destructive one of the voltage.

Lightning discharges can occur between clouds or between clouds, or clouds to the ground; and the use of much large-capacity electrical equipment to bring the internal surge, the impact of power supply systems and electrical equipment, as well as lightning and surge Protection, has become the focus of attention.

Clouds and ground between the lightning strike, by a single or a number of separate lighting composition, each lightning to carry a number of high amplitude, the duration of a very short current. A typical lightning discharge will include two or three times the lightning, each time the lightning is about half a second of the time between. Most lightning currents fall between 10,000 and 100,000 amps, and the duration is typically less than 100 microseconds.

Internal power supply system due to the use of large-capacity equipment and frequency conversion equipment, bringing the increasingly serious internal surge problem. We attribute it to transient overvoltage (TVS). Any electrical equipment has a permissible range of power supply voltage. Sometimes even a very narrow over-voltage shock will cause the device power or all damage. Transient overvoltage (TVS) destruction is the case. Especially for some sensitive microelectronic devices, and sometimes very small surge shocks can cause fatal damage.