SPD Surge Protective Device

Scope of Application

XUCKY SPD Surge protective Device, B, C, D series large current modular SPD Surge protective Device is used for power supply systems of AC 50/60Hz, the TT, IT, TN-S, TN-C, TN-C-S of rated voltage 380V and below, to protect the power grid caused by lightning or surge overvoltage. The design is based on the IEC61643-1, it can discharge the 100kA lightning current, case is installed on 35mm electric rail, the detachment device automatically will be out of its power grid, meanwhile the status indicator turns from green to red. SPD Surge protective Device has protection modes of common mode (MC) and differential mode (MD).

SPD Surge protective Device complies with the requirements IEC61643-1 standard.

The function of surge protective device

SPD Surge protective Device use a varistor of excellent nonlinear, in normal conditions, surge protective device is in high resistance state, the leakage current is almost zero, to ensure the normal power supply for power supply system. When the overvoltage of the power system appears, the surge protective device immediately conduct in nanoseconds, the amplitude of overvoltage limit in the safety work scope of the equipment. At the same time, the over-voltage energy is released. Then, the surge protective device quickly turned into a high impedance state, which does not affect the normal power supply for power system.

Structure and working principle

SPD Surge protective Device in three-phase four-wire system, the surge protective devices are connected between the three phase lines and a zero line ground wire. Surge protective device is in high resistance state under normal circumstances, when surge voltage of the power grid caused by lightning or other causes appears , the surge protective device will immediately conduct in the nanosecond time to take surge into the earth, and to protect electrical equipment on the power grid. When the surge voltage passes through the protector, after disappears, the surge protective device changes to high resistance state, thereby not affecting the normal operation of the power network.

Product Features

★ use of independent intellectual property rights of high-performance zinc oxide varistor film

★ use of professional technology within the metal shield protection module

★ built-in over-current overheating, temperature control circuit technology

★ Alarm indication is obvious, green (normal), red (fault)

★ module design, easy installation, maintenance, easy maintenance

★ with a remote communication interface, enabling remote monitoring

Main technical parameters

Diagram

The main structure and working principle

In the three-phase four-wire system, three phase lines and a neutral line are connected with a protector between the butt.

Under normal circumstances, the protector is in a state of high resistance, and when the power grid has a surge overvoltage due to lightning strikes or other reasons, the protector will immediately be quickly switched on in nanosecond time, and the surge overvoltage will be introduced into the ground, thus protecting the electrical equipment on the power grid.

When the surge voltage passes through the protector, and disappears, the protector changes back to the high resistance state, so as not to affect the normal operation of the power grid. The electrical schematic diagram of the surge protector is shown below.

Note: 1, thermal failure disconnector 2, varistor sheet

Installation location and application

■ C-class lightning current SPD protector for lightning equip potential bonding.

■ Install LPZ0B or LPZ1 area and LPZ2 area.

■ Surge protective Device is usually installed in the floor distribution box, computer center, telecommunication room, elevator control room, cable TV room, building control room, security monitoring center, fire control center, industrial control room, frequency conversion equipment control room, hospital operating room, ICU and Equipped with electronic

OUTLINE AND INSTALLATION DIMENSIONS

1P

2P

3P

4P

Why use surge protector

The destructive force of lightning is great, lightning outside the switching power supply (lightning rod) is not enough, the lightning wave will directly or indirectly (through electromagnetic induction) invaded all electrical pathways and metal channels (such as power line and signal line, antenna and metal pipe etc.). Overvoltage and lightning surge voltage resulting will cause great harm to the network system, electrical equipment, electronic information, light damaged lines, heavy damage to the device, make the system paralysis, caused incalculable loss.The lightning current rapidly changing, in the electric.