How to do three-level lightning protection in the engine room
2023-05-14 04:07:48
The main purpose of lightning protection is to prevent lightning and other internal overvoltages from intruding into the equipment and cause damage. The comprehensive lightning protection scheme combined with outdoor lightning protection and line lightning protection is introduced. External lightning protection and internal lightning protection, protection zone, lightning protection and other potential interception are introduced. concept. The principle of the power lightning protection device was analyzed. The use of a power supply lightning protector can release a large amount of pulse energy generated by the lightning stroke on the circuit in the shortest time and discharge it to the earth in a short circuit, thereby reducing the potential difference between the interfaces of the device and protecting the devices on the circuit.
1. The first level of power supply lightning protection For the three-phase four-wire system of urban power supply network, the first-level power supply lightning protection four lines use high-energy lightning arresters four, in the three fire lines, a high-energy arrester connected to ground in a zero line. .
When the rated current of the power supply circuit fuse F1 (or air switch) is greater than 250A, a 250A fuse F2 (or air switch) shall be installed on the high energy arrester parallel branch (FireWire), but not vice versa.
2. Second-level power supply lightning protection The second-level power supply lightning protection uses four over-voltage protection devices, in each of three fire lines, a zero line, and an over-voltage protection device connected to the ground.
Under normal conditions, the protector is in a high-impedance state. When the power grid has a transient pulse voltage due to a lightning strike or a switch operation, the zinc oxide varistor element in the built-in module of the overvoltage protector is quickly turned on within the nanosecond time. The pulse voltage is short-circuited to ground discharge to protect all devices. When the pulse voltage flows through the protector, the protector turns to a high-impedance state, which does not affect the power supply of the device.
When the rated current of the power supply circuit fuse F1 (or air switch) is greater than 125A, a 125A fuse F2 (or air switch) shall be installed on the parallel branch of the overvoltage protector (FireWire), and vice versa.
3. Power supply The third-level lightning protection The third-level lightning protection is used to protect the power system of the important equipment and the fine overvoltage protection of the electronic equipment. It is installed on the rack-mounted lightning protection power supply or power lightning protection outlet (PDU lightning protection device) of important equipment.
1. The first level of power supply lightning protection For the three-phase four-wire system of urban power supply network, the first-level power supply lightning protection four lines use high-energy lightning arresters four, in the three fire lines, a high-energy arrester connected to ground in a zero line. .
When the rated current of the power supply circuit fuse F1 (or air switch) is greater than 250A, a 250A fuse F2 (or air switch) shall be installed on the high energy arrester parallel branch (FireWire), but not vice versa.
2. Second-level power supply lightning protection The second-level power supply lightning protection uses four over-voltage protection devices, in each of three fire lines, a zero line, and an over-voltage protection device connected to the ground.
Under normal conditions, the protector is in a high-impedance state. When the power grid has a transient pulse voltage due to a lightning strike or a switch operation, the zinc oxide varistor element in the built-in module of the overvoltage protector is quickly turned on within the nanosecond time. The pulse voltage is short-circuited to ground discharge to protect all devices. When the pulse voltage flows through the protector, the protector turns to a high-impedance state, which does not affect the power supply of the device.
When the rated current of the power supply circuit fuse F1 (or air switch) is greater than 125A, a 125A fuse F2 (or air switch) shall be installed on the parallel branch of the overvoltage protector (FireWire), and vice versa.
3. Power supply The third-level lightning protection The third-level lightning protection is used to protect the power system of the important equipment and the fine overvoltage protection of the electronic equipment. It is installed on the rack-mounted lightning protection power supply or power lightning protection outlet (PDU lightning protection device) of important equipment.
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