Surge protection Device (Surge protection Device) is an indispensable device in electronic equipment lightning protection, used to be called "lightning arrester" or "overvoltage protector" English abbreviation for SPD.
It is an electronic device that provides security protection for various electronic equipment, instruments and communication lines. When the electrical circuit or communication line suddenly produces a peak current or voltage due to external interference, the surge protector can switch on the shunt in a very short time, so as to avoid the damage of the surge to other equipment in the circuit. The role of the surge protector is to limit the instantaneous overvoltage into the power line, signal transmission line within the voltage range that the equipment or system can withstand, or to discharge a strong lightning current into the ground to protect the protected equipment or system from impact damage. The type and construction of the surge protector varies according to the application, but it should contain at least one nonlinear voltage limiting element. The basic components used for surge protection include discharge gap, gas discharge tube, varistor, suppression diode and choke coil, etc. SPD is an indispensable device in the lightning protection of electronic equipment, whose role is to limit the instantaneous overvoltage into the power line, signal transmission line within the voltage range that the equipment or system can withstand, or the powerful lightning flow into the ground to protect the protected equipment or system from impact.
The basic features of the lightning arrester are:
1, the protection flow is large, the residual pressure is very low, the response time is fast;
2, using the latest arc extinguishing technology, completely avoid fire;
3, using temperature control protection circuit, built-in thermal protection;
4, with power status indicator, indicating the working status of the surge protector;
5, rigorous structure, stable and reliable work.
Performance characteristics
l Single-phase integrated power surge protection box adopts common mode and differential mode full protection mode
l Single-phase integrated power surge protection box adopts multi-level pressure-sensitive embedment parallel technology
l Single-phase integrated power surge protection box adopts large flow rate and low residual pressure and fast response time
l Single-phase integrated power surge protection box with load overcurrent, overheat, failure separation device
l Single-phase integrated power surge protection box
Function characteristics
The role of lightning arrester is used to protect all kinds of electrical equipment in the power system from lightning overvoltage, operating overvoltage, power frequency transient overvoltage impact and damage of an electrical appliance. The main types of lightning arrester are protection gap, valve type lightning arrester and zinc oxide lightning arrester. The protection gap is mainly used to limit atmospheric overvoltage, and is generally used for the protection of distribution systems, lines and substations. Valve type lightning arrester and zinc oxide lightning arrester are used for the protection of substation and power plant, in the 500KV and below system is mainly used to limit atmospheric overvoltage, in the ultra-high voltage system will also be used to limit internal overvoltage or as internal overvoltage backup protection.
The series parallel type is a concept proposed according to the characteristics of many application occasions and protection range hierarchy in modern lightning protection (compared to the traditional parallel type lightning protection device). Its essence is the effective combination of multistage discharger and filter technology through energy matching and voltage distribution. Series parallel lightning protection has the following characteristics: widely used. Not only can it be applied according to routine, but also suitable for places that are difficult to distinguish in protected areas. The voltage division and delay function of the induced decoupling device under transient overvoltage are used to help realize energy matching. Slow the rise rate of transient interference for low residual voltage, long life and extremely fast response time.
The other parameters of the lightning arrester depend on the level of the lightning protection zone where each protected object resides. The working voltage of the arrester is determined by the rated voltage of all components installed in the pilot circuit. Series parallel surge arrester also needs to pay attention to its rated current.