How To Select Surge Protector For Elevator Shaft?
Many people are confused about the selection of surge protectors for elevator shafts. The role of surge protection device for elevator shafts is related to the safety of elevators, so it is a very serious safety issue! So how to choose? Today, let's talk about the issue of surge protective device for elevator shafts.
How to select surge protectors for elevator shafts
There are two types of elevator shafts:
1. A part of the external elevator shaft or the head of the elevator shaft will be exposed outdoors
2. The elevator shaft inside the building is a machine room-less elevator shaft, and the whole does not protrude from the building.
How to select surge protectors for elevator shafts
If you want to choose the right surge protector for elevator shafts, you should first understand the relevant concepts of lightning protection zones. According to GB50343-2012 "Technical Specifications for Lightning Protection of Electronic Information Systems in Buildings":
3.2.2 Lightning protection zones should comply with the following provisions:
LPZ0A area: an area threatened by direct lightning strikes and all lightning electromagnetic fields. The internal system of this area may be affected by all or part of the lightning surge current;
LPZ0B area: Direct lightning protection area, but the threat of this area is still the entire lightning electromagnetic field. The internal system of this area may be affected by all or part of the lightning surge current;
LPZ1 area: The area where the surge current is limited due to the shunt at the boundary and the action of the surge protector. The spatial shielding of this area can resist the lightning electromagnetic field;
LPZ2~n subsequent lightning protection area: The area where the surge current is further limited due to the shunt at the boundary and the action of the surge protector. The spatial shielding of this area can further attenuate the lightning electromagnetic field.
How to select the elevator shaft surge protector
1. A part of the external elevator shaft or the elevator shaft head will be exposed to the outdoors. In this case, and the building power supply line is directly connected from the substation, according to the lightning protection zoning theory, the elevator shaft is located in the LPZ0A or LPZ0B area. How to select the elevator shaft surge protector in this case? Considering that the elevator shaft faces the threat of direct lightning strikes or all lightning electromagnetic fields, a T1-level surge protector with an UP value of <1.5kv should be selected, which can meet the requirements of lightning protection and precision equipment protection at the same time.
2. The elevator shaft is inside the building, and it is a machine room-less elevator shaft, and the whole does not protrude from the building. In this case, and the building power supply line is introduced from the metering room, and the T1-level SPD has been installed at the front end, according to the lightning protection zoning theory, the elevator shaft is located in the LPZ1 area. How to choose a surge protector? At this time, as long as the possible induced lightning current or transient overvoltage threat in the line is considered, a T2-level surge protector with an UP value of <1.5kv can be selected.
Hangzhou Yizao T1-level composite surge protector, small size (73mm), suitable for installation in small spaces, large flow (25KA/10/350us), low UP (1.5kv), can meet the surge protector requirements of elevator shafts in public transformer projects; T2-level surge protector, UP as low as 1.2KV, meets the design requirements of residential elevator shafts; the product has passed TUV, CQC, CE certification, creepage distance> 10mm, suitable for use in high altitude areas and high temperature and humidity and other harsh environments, can effectively protect the stable operation of elevator equipment.
How to choose an elevator shaft surge protector
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