FGBZ,FGBS Composite Overvoltage ProtectorDetailed product description：

The FGBZ and FGBS composite overvoltage protector is currently the most advanced overvoltage protector. It is an organic combination of resistance capacitance absorber and lightning arrester, which can effectively protect against operating overvoltage and also has lightning protection function. Widely used in motors, reactors, transformers, and distribution lines for vacuum circuit breaker operation.
This product adopts a four-star three-phase combination connection method and adds a contactless self-control device. It has excellent phase to phase protection function, and at the same time, during normal operation of the power grid and single-phase grounding faults, the vulnerable capacitor part of the resistance and capacitance absorber is isolated from the power grid, avoiding the high accident rate of the resistance and capacitance absorber itself. The lightning arrester is connected to the capacitance part using a special structure, which effectively reduces the volume and makes the overall structure compact and beautiful.
The FGBZ and FGBS composite overvoltage protectors not only retain the overall technical characteristics that should be possessed by a general resistor capacitor absorber in parallel with a lightning arrester, but also have the following advantages: good phase to phase protection; There is no need to separately calculate the insulation coordination between the resistance capacitance absorber and the lightning arrester; Not affected by high-order harmonic interference from the power grid; Will not provide additional grounding capacitor current to the power grid, which is beneficial for overall electrical design; Beneficial for eliminating resonance overvoltage; Low dispersion and not affected by atmospheric conditions; A discharge action recorder can be installed to understand and monitor the operation status of the protector.

1、 Application and execution standards of FGBZ and FGBS composite overvoltage protectors
The dedicated protection equipment for overvoltage caused by vacuum switch opening and closing in AC medium voltage 3-66kV power systems is a resistance capacitance absorber, but it cannot protect against lightning and other high amplitude overvoltages. On the other hand, even with a modular design, lightning arresters still cannot achieve the ideal effect of completely preventing hazardous operating overvoltage. The product that combines the two in the correct configuration is a composite overvoltage protector (hereinafter referred to as the protector).
This protector is designed for use inside cabinets and is compatible with vacuum switches. The device combines high-frequency oscillation absorption and high amplitude valve type voltage limiting, which can effectively limit operating overvoltage and has strong lightning protection function. The composite module design eliminates the complex calculation and selection of independent design by users, greatly reducing the error rate of insulation coordination in electrical design. Adopting a four-star three-phase combination connection method, it meets the actual situation of China's power grid and has strong inter phase protection capability. Dry design, fully enclosed structure, safe and durable, compact and beautiful, effectively achieving full functionality and miniaturization.
The technical specifications for protectors are implemented according to the following standards:
GB11032-2000 "AC gapless metal oxide lightning arrester"
JB/T9672-1999 "Metal Oxide Surge Arresters with Series Gap"
GB311.1-1997 "Insulation Coordination for High Voltage Transmission and Transformation Equipment"
GB11024.1-2001 "Parallel Capacitors for Electric Power above 1kV"
GB3667-1997 "AC Motor Capacitors"
DL/T620-1997 "Overvoltage Protection and Insulation Coordination for AC Electrical Installations"

2、 Usage conditions for FGBZ and FGBS composite overvoltage protectors
*Environmental temperature: not higher than+40 ℃, not lower than -40 ℃;
*Altitude: not exceeding 1500m (above 1500m is a specialized high-altitude product);
*Power frequency: 50 ± 2Hz; 60 ± 2Hz;
*Seismic intensity: 7 degrees or below;
*Maximum wind speed: 35m/s;
*There is no corrosive, explosive gas or dust in the air at the installation point;
*The short-term power frequency voltage rise at the installation point shall not exceed the rated voltage of the absorber.

3、 Model Definition