To protect an electrical installation in a building, simple rules apply for the choice of
1. SPD(s);
2. its protection system.
For a power distribution system, the main characteristics used to define the lightning protection system and select a SPD to protect an electrical installation in a building are:
1. SPD
1.1 quantity of SPD
1.2 type
1.3level of exposure to define the SPD’s maximum discharge current Imax.
2. Short circuit protection device
2.1 maximum discharge current Imax;
2.2 short-circuit current Isc at the point of installation.
The logic diagram in the Figure 1 below illustrates this design rule.
Fig.1 – Logic diagram for selection of a protection system
The other characteristics for selection of a SPD are predefined for an electrical installation.
1. number of poles in SPD;
2. voltage protection level Up;
3. operating voltage Uc.
This sub-section Design of the electrical installation protection system describes in greater detail the criteria for selection of the protection system according to the characteristics of the installation, the equipment to be protected and the environment.
The IEC 62305 standard parts 1 to 4 (NF EN 62305 parts 1 to 4) reorganizes and updates the standard publications IEC 61024 (series), IEC 61312 (series) and IEC 61663 (series) on lightning protection systems. Part 1 – General principles This part presents general information on lightning and its characteristics and general data, and introduces […]
Connections of a SPD to the loads should be as short as possible in order to reduce the value of the voltage protection level (installed Up) on the terminals of the protected equipment. The total length of SPD connections to the network and the earth terminal block should not exceed 50 cm. One of the […]
The fusewas invented by Edison more than 100 years ago to protect the expensive incandescent lamp. With the development of The Times, fuses protect electrical equipment from the current overheating injury, avoid electronic equipment due to internal failure caused by serious injury. When electric current flows through a conductor, the conductor will heat up because there […]
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