Lightning protection points for switching power supplies

1. Modern communication switching power supply is equipped with remote monitoring functions, such as remote signaling, telemetry and remote control, and the signal line interface associated with it has a long communication distance, which is extremely vulnerable to damage caused by inductive lightning and causes downtime and other accidents. According to the requirements of the Ministry of Information Industry, the corresponding signal lightning arrester should be installed to protect it.

Second, the installation of DC lightning arrester is proposed in the recently released lightning protection standard, because the residual voltage of the DC lightning protection device is much lower than the AC lightning protection device, so it can effectively improve the sensitive equipment in the communication switching power supply communication station to resist lightning. The ability of electromagnetic pulses.

Third, the lightning protection capability of the lightning arrester is closely related to the installation method. The main reason is that the lead inductance will generate additional residual voltage. The connection between the power line and the lightning arrester and the lightning arrester and the grounding junction board should be shortened as much as possible. The length of the line.

Fourth, the multi-stage arrangement of the lightning arrester can reduce the extra residual voltage brought by the lead inductance, because the front-end lightning protection device has discharged most of the lightning current into the ground, and the lightning protection device in the latter stage only discharges a small part of the lightning. The reduction in current, lightning current, necessarily results in a reduction in additional residual voltage on the leads. In order to ensure the energy coordination of the front and rear stages of the lightning arrester, the length of the power cable between the lightning arresters should be no less than 15 meters, otherwise the decoupler should be used for energy coordination.

5. The lightning protection of incoming power cables is easy to attract attention, while other power lines entering and leaving communication stations are often neglected, such as lighting street lights, tower lamp power lines, and non-telecom facilities to lease telecom power lines. It is now advisable to use solar tower lights to reduce the number of lightning strikes. Other outgoing power lines should be within the protection range of the lightning protection system, otherwise special lightning protection measures should be taken.