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What are the installation methods of the surge protector?
A surge protector, also called a lightning arrester, is an electronic device that provides safety protection for various electronic devices, instruments, and communication lines. When a sudden current or voltage is suddenly generated in an electrical circuit or a communication line due to external interference, the surge protector can conduct the shunt in a very short time, thereby avoiding damage to other equipment in the circuit by the surge.
1, SPD routine installation requirements
Surge protector is installed with 35MM standard rail
For a stationary SPD, the following steps should be followed for a regular installation:
1) Determine the discharge current path
2) Mark the wire for the extra voltage drop caused at the device terminal.
3) To avoid unnecessary inductive loops, mark the PE conductor of each device.
4) Establish an equipotential bonding between the device and the SPD.
5) To coordinate energy coordination of multi-level SPD
In order to limit the inductive coupling between the installed protective part and the unprotected part of the device, certain measurements are required. The mutual inductance can be reduced by the separation of the sensing source from the sacrificial circuit, the selection of the loop angle, and the limitation of the closed loop region.
When the current carrying component conductor is part of a closed loop, the loop and induced voltage are reduced as the conductor approaches the circuit.
In general, it is better to separate the protected wire from the unprotected wire and it should be separated from the ground wire. At the same time, in order to avoid transient quadrature coupling between the power cable and the communication cable, the necessary measurements should be made.
2, SPD grounding wire diameter selection
Data line: The requirement is greater than 2.5mm2; when the length exceeds 0.5m, it is required to be greater than 4mm2. YD/T5098-1998.
Power line: When the phase line cross-sectional area S≤16mm2, the ground line uses S; when the phase line cross-sectional area is 16mm2≤S≤35mm2, the ground line uses 16mm2; when the phase line cross-sectional area S≥35mm2, the ground line requires S/2; GB 50054, section 2.2.9