Introduction to the Principle and Structural Features of Overvoltage Protectors

Principle of Overvoltage Protection Device

The principle of overvoltage protector: FR is zinc oxide nonlinear resistor, CG is the discharge gap. Due to the symmetrical structure, the same overvoltage protection multiple is achieved whether between phases or relative to ground.

The overvoltage protector consists of four protection units, with three connected to the system's A, B, and C phases, and the fourth grounded.

The 131 type overvoltage protector is a three-column design, allowing the three columns to be freely interchanged and installed between phases A, B, and C. The grounding phase must be installed with grounding.

Overvoltage Protector Structural Features

The three-phase combined surge protector offers unparalleled features compared to traditional lightning arresters and other similar products:

The structure utilizes a series connection of zinc oxide nonlinear resistors and discharge gaps, mutually protecting each other. The discharge gap ensures the zinc oxide nonlinear resistor has zero charge, and the nonlinear characteristics of zinc oxide immediately extinguish the arc after the discharge gap operates, eliminating any residual current or chopped wave. The discharge gap no longer bears the arc-quenching task, enhancing the product's lifespan. Under operational overvoltage, the operating lifespan can reach 10^5 cycles.

2. The voltage surge coefficient is 1, ensuring that the discharge values remain equal across various voltage waveforms. It is unaffected by the type of overvoltage operation, with precise overvoltage protection values and excellent protection performance.

3. Utilizing a tetrahedral connection method significantly reduces the inter-phase overvoltage, achieving a reduction of 60-70% compared to conventional surge arresters, greatly enhancing the reliability of protection.

4. The overvoltage protector with a silicone rubber sheath and a high-voltage cable external structure, in addition to the electrical properties of porcelain insulated sheaths, also boasts advantages such as easy installation, strong sealing, compact size, and vibration resistance. It can be directly mounted on the handcart base of a switchgear cabinet or within a transformer room.

5. Operates in ambient temperatures ranging from -40℃ to +60℃ and at altitudes below 2000m (for altitudes above 2000m, please specify at time of order).

6. In the event of intermittent arc-ground overvoltage and ferrite resonance overvoltage in the system, the overvoltage protector can provide protection if the energy is less than 2ms.400A square wave impulse energy.