Substations can be mainly divided into: hub substations, terminal substations; step-up substations, step-down substations; power system substations, industrial and mining substations, railway substations (27.5KV, 50HZ); 1000KV substations, 750KV substations, 500KV substations, 330KV substations, 220KV Substation, 110KV substation, 66KV substation, 35KV substation, 10KV substation, 6.3KV substation with voltage level, 10KV substation, box substation. Then how to design and construct the secondary lightning protection engineering design of the substation, followed by the focus of Zhengzhou Leidi Electronic Engineering Co., Ltd.
The lightning protection of the power system includes: lightning protection for lightning protection in substations, secondary lightning protection for substations, grounding grounding for substations, lightning protection for 35KV substations, lightning protection for 10KV substations, and lightning protection for 110kv substations.
Substation Secondary mine engineering design concrete steps <br> <br> from the way invasive substation lightning current secondary system, take appropriate lightning protection measures.
80% of the lightning damages caused by electronic devices are caused by the intrusion of lightning into the power supply. In order to prevent lightning waves from intruding into secondary devices from the power supply system, the following measures are mainly taken.
1 The metal oxide arrester of the corresponding voltage class is installed on the low voltage side of the transformer to be used for protection.
2 Connect the isolation transformer in series with the power supply of the microcomputer protection and the integrated automation device, and add the capacitance to the ground for the absorption of the lightning wave.
3 Connect the surge absorption protector in series with the power supply of the microcomputer protection and the integrated automation device.
Because the communication cable of the substation has a long cable outlet, the induction lightning intrudes through the remote control system cable and the signal cable, and directly adds a high voltage to the secondary device, causing the device to be damaged. In view of this situation, low-voltage outlets of station transformers should be installed with ordinary ceramic low-voltage surge arresters, and metal oxide arresters should be installed on the power supply of the secondary system. Remote control, measurement and signal cables use shielded cables and the shield is grounded at both ends.
When the substation is struck by a lightning, the lightning current flows into the grounding grid through the lightning protection device. If the voltage equalization effect of the grounding grid is not good, the local position of the grounding net will increase under the action of a strong lightning current, causing the ground potential to counterattack the secondary device. . In view of this situation, the following aspects should be done: Minimize the grounding resistance of the grounding grid so that it meets the resistance values ​​required by the regulations. In the mountainous region where it is difficult to reach the required grounding resistance, a voltage equalization equalization system should be established. In this case, although the local ground potential is high when the lightning strike occurs, the voltage difference across the secondary device is almost zero. It can also effectively avoid secondary equipment damage; from another perspective, it is to install surge protectors (SPDs) at all important secondary equipment ends to avoid damage to the microelectronic devices.
The lightning protection of secondary systems in substations is a systematic project. It is necessary to adopt multiple measures such as shielding, pressure equalization, and installation of SPD, and take three levels of protective measures. Implement the comprehensive prevention and control of electronic information, the overall prevention of unloading, classification and discharge of ideas and layers of defense. At present, the lightning protection of substation secondary systems is still a new topic. How to better protect it needs further study. This article describes the secondary lightning protection design for substations here. If you need further understanding, please contact our technical personnel!
The lightning protection of the power system includes: lightning protection for lightning protection in substations, secondary lightning protection for substations, grounding grounding for substations, lightning protection for 35KV substations, lightning protection for 10KV substations, and lightning protection for 110kv substations.
Substation Secondary mine engineering design concrete steps <br> <br> from the way invasive substation lightning current secondary system, take appropriate lightning protection measures.
80% of the lightning damages caused by electronic devices are caused by the intrusion of lightning into the power supply. In order to prevent lightning waves from intruding into secondary devices from the power supply system, the following measures are mainly taken.
1 The metal oxide arrester of the corresponding voltage class is installed on the low voltage side of the transformer to be used for protection.
2 Connect the isolation transformer in series with the power supply of the microcomputer protection and the integrated automation device, and add the capacitance to the ground for the absorption of the lightning wave.
3 Connect the surge absorption protector in series with the power supply of the microcomputer protection and the integrated automation device.
Because the communication cable of the substation has a long cable outlet, the induction lightning intrudes through the remote control system cable and the signal cable, and directly adds a high voltage to the secondary device, causing the device to be damaged. In view of this situation, low-voltage outlets of station transformers should be installed with ordinary ceramic low-voltage surge arresters, and metal oxide arresters should be installed on the power supply of the secondary system. Remote control, measurement and signal cables use shielded cables and the shield is grounded at both ends.
When the substation is struck by a lightning, the lightning current flows into the grounding grid through the lightning protection device. If the voltage equalization effect of the grounding grid is not good, the local position of the grounding net will increase under the action of a strong lightning current, causing the ground potential to counterattack the secondary device. . In view of this situation, the following aspects should be done: Minimize the grounding resistance of the grounding grid so that it meets the resistance values ​​required by the regulations. In the mountainous region where it is difficult to reach the required grounding resistance, a voltage equalization equalization system should be established. In this case, although the local ground potential is high when the lightning strike occurs, the voltage difference across the secondary device is almost zero. It can also effectively avoid secondary equipment damage; from another perspective, it is to install surge protectors (SPDs) at all important secondary equipment ends to avoid damage to the microelectronic devices.
The lightning protection of secondary systems in substations is a systematic project. It is necessary to adopt multiple measures such as shielding, pressure equalization, and installation of SPD, and take three levels of protective measures. Implement the comprehensive prevention and control of electronic information, the overall prevention of unloading, classification and discharge of ideas and layers of defense. At present, the lightning protection of substation secondary systems is still a new topic. How to better protect it needs further study. This article describes the secondary lightning protection design for substations here. If you need further understanding, please contact our technical personnel!
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