Lightning protectors, also known as lightning arresters, surge protectors, surge protectors, overvoltage protectors, etc., mainly include power lightning protectors and signal lightning protectors. Lightning protectors use modern electricity and other technologies to prevent lightning strikes. Damage to the equipment. The lightning energy absorption in the arrester is mainly zinc oxide varistor and gas discharge tube.

The structure of the lightning current distribution between different devices is as follows: About 50% of the lightning enters the ground through the external lightning protection device, and the other 50% of the lightning current will be distributed in the metal material of the entire system. This estimation model is used to estimate the flow and specifications of metal conductors in the LPAOA, LPZOB and LPZ1 areas. The lightning flow in this area is a 10/35μs current waveform. The distribution of the lightning current of metal materials: each part of the lightning current amplitude depends on the impedance inductance of the distribution channel, which can be allocated to the distribution channel refers to the metal material of the lightning current, such as wires, signal lines, water pipes, metal frames and metal and For other ground levels, usually only their ground resistance can be roughly estimated. In the case of uncertainty, the resistance is considered equal, that is, the evenly distributed current of each metal wire.

1. This is introduced in the power line. When the power line may be directly struck by lightning and enter the building area of ??irfpa lightning current, it depends on the line, the lightning discharge line impedance, and the inductance of the branch and the user end. If the internal and external impedances are the same, the power line is allocated half of the direct lightning current. In this case, it is necessary to adopt a lightning arrester with anti-direct ray function.

2. The model is used to estimate the lightning current distribution in the protection zone after LPZ1. Since the insulation impedance of the user terminal is much larger than the impedance of the lightning protection circuit and the external circuit, the lightning traffic in the subsequent lightning protection zone will be reduced, and the value should not be estimated. The general requirements for electric lightning protection within the scope of subsequent lightning protection of 20kA (8/20 acres) electric lightning protection does not require the use of lightning protection devices for mine flow.

3. The selection of lightning protection devices in subsequent areas should consider the energy distribution and voltage coordination between different levels. When many factors are difficult to determine, the use of cords and power arresters is a good choice. This series is based on the characteristics of many applications and the protection range of modern lightning protection (compared with traditional lightning protection equipment). It is an effective combination of multi-stage supercharger and filtering technology, with energy coordination and voltage distribution. This series and lightning protection have the following characteristics: Widely used. The application is not only suitable for ordinary applications, but also suitable for protecting areas that are difficult to distinguish. Utilizing the pressure and delay of the inductive decoupling device of transient overvoltage helps to realize energy cooperation. The increase rate of transient interference is reduced, so as to achieve low residual pressure and life, and the response time is very fast.

4. The selection of other parameters of the lightning protection device depends on the level of the lightning protection area where each protected object is located, and its working voltage is subject to the rated voltage of all components installed in the lead circuit. The series-parallel lightning arrester also needs to pay attention to its rated current.

5. Other factors that affect the distribution of lightning flow in electronic circuits: the reduction of grounding resistance at the transformer end will increase the current distribution of electronic circuits. The increase in the length of the power supply cable will reduce the distribution of wire current and the balance of current distribution. Short cable lengths and low neutral line impedance will cause current imbalance, leading to differential mode interference.