How To Select And Connect A Surge Protector?
How to select and connect surge protectors? This article tells you two knowledge points: selection and wiring. As internal lightning protection is increasingly valued, the importance of surge protective device has also been gradually excavated. As the requirements for lightning protection for related electronic equipment become increasingly stringent, the selection of surge protection device has also become a top priority.
How to select and connect surge protectors. For AC power supply lines entering buildings, at the junction of LPZ0A or LPZ0B and LPZ1 areas such as the main distribution box of the line, a surge protector of Class I test or a surge protector of Class II test should be installed as the first-level protection; at the junction of subsequent protection areas such as the distribution box of the distribution line and the distribution box of the electronic equipment room, a surge protector of Class II or Class III test can be installed as the post-stage protection; the power port of particularly important electronic information equipment can be installed with a surge protector of Class II or Class III test as fine protection. Information equipment using DC power supply should be equipped with an adaptive DC power supply line surge protector depending on its working voltage requirements.
The meaning of level 1, 2, and 3 surge protectors, T1 and T2:
① Level 1 surge protectors, according to national standards, refer to surge protectors with T1 test.
② Level 2 surge protectors, according to national standards, refer to surge protectors with T2 test ≥ 40kA.
③ Level 3 surge protectors, generally refer to 20kA surge protectors.
④ Level T1 refers to the T1 test level, the test waveform is 10/350us, and the main parameters are marked with impulse current Iimp; Level T2 refers to the T2 test level, the test waveform is 8/20us, and the parameters are marked with maximum discharge current Imax and nominal discharge current In
How to select and wire a surge protector. The maximum continuous operating voltage of the surge protector should not be less than the minimum value specified in Table J.1.1 of GB 50057; when the power supply voltage deviation at the installation location of the surge protector exceeds the specified 10% and the harmonics increase the voltage amplitude, the minimum value of the maximum continuous operating voltage specified in Table J.1.1 should be increased for the voltage-limiting surge protector according to the specific situation.
How to select and connect a surge protector. Selection of surge protector current capacity/discharge current (Iimp, Imax, In):
The distribution system should adopt a hierarchical configuration according to standard requirements. The first level of protection should be able to withstand most of the lightning current, the second level should discharge the residual lightning current, limit the residual voltage at the equipment end, and cooperate with the first level of protection. Surge protectors are generally installed in parallel and are not affected by the power of the system.
