Advantages of series gap zinc oxide arrester

The arrester is an over-voltage protection electrical appliance, and it still has the problem of over-voltage protection. For overvoltages with limited energy, such as lightning overvoltages and operating overvoltages, the discharge current of the arrester can act as a voltage limiting protection. For overvoltages with unlimited energy (with supplementary energy), such as transient overvoltage (the general term for power frequency overvoltage and resonance overvoltage), its frequency is either power frequency or an integer or fractional multiple of power frequency, and When the frequency of the power supply is always in sync, if the transient overvoltage is triggered for some reasons, the power supply can automatically supplement the overvoltage energy, even if the voltage amplitude does not attenuate or only weakly attenuates, the transient is over. If the voltage enters the protective action zone of the arrester, it will inevitably operate repeatedly for a long time until thermal breakdown, and the arrester is damaged and exploded. Therefore, the transient overvoltage has a fatal hazard to the arrester. If all the transient overvoltages have been limited to the arrester that protects the dead zone from its harm, it is called strong transient overvoltage withstand capability, and vice versa, it is called poor transient overvoltage withstand capability. Silicon carbide arresters have strong ability to withstand transient overvoltages, but due to the poor stability of their operating characteristics during operation, they may still suffer from transient overvoltages due to the drop in the value of the impulse discharge voltage (initial voltage of the protective action zone). The gapless zinc oxide arrester has a low inflection point voltage (approximately the reference voltage can be regarded as the inflection point voltage), only 2.21～2.56Uxg (maximum phase voltage), and some transient overvoltage maximums reach 2.5～3.5Uxg, so There is the shortcoming of poor transient overvoltage withstand capability. The effective protection method for transient overvoltage hazards is to add series gaps with stable structural performance to limit all transient overvoltages in the protection dead zone to protect the arrester from its hazards. Zinc oxide surge arresters with series gaps have this unique advantage.

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