The normal production activities of contemporary human beings are increasingly inseparable from "electricity". It is no exaggeration to say that modern cities will be paralyzed by power outages. The electrical equipment that undertakes the transmission of electrical energy itself has a high vulnerability, excluding the damage of electrical equipment caused by improper operation of man-made, and more damage caused by natural disasters.

Among them, the most serious is the damage to electrical equipment caused by the earthquake.

The 1964 Niigata earthquake in Japan, the 1976 Tangshan earthquake, the 1971 SanFernando earthquake in the United States, the 1989 LomaPrieta earthquake in the United States, the 1994 Northridge earthquake in the United States, the 1995 Hanshin earthquake in Japan, the 1999 Kocaeli earthquake in Turkey, the 1999 Ji Ji earthquake in Taiwan, China, and the 2008 Wenchuan earthquake caused serious damage to the electrical equipment of the substation.

It not only caused serious economic losses, but also seriously affected the post-earthquake relief and post-disaster reconstruction.

In 1994, the Northridge (Northridge) earthquake in the United States caused power system losses of about $80 million. High-voltage electrical equipment was severely damaged, with 63 of the 221 electrical devices in the power system severely damaged, causing the first complete blackout in the history of the Los Angeles area.

In 1995, the Great Hanshin Earthquake in Japan caused a loss of about 2800MW in the power system and 2.6 million users were cut off. The quake caused a total of $2.3 billion in damage, the Kansai Power Company reported.

In 1999, the Kocaeli earthquake in Turkey caused severe damage to the power system. Most of the damage forms of electrical equipment are the damage of switching equipment, lightning arresters, circuit breakers and transformers. The earthquake caused a total of about $70 million in damage.

According to statistics, a total of 247 earthquake disasters have occurred in mainland China in the past 20 years, and the power system has suffered a total of 97 earthquake disasters, with direct economic losses reaching 13.288 billion billion yuan.

In 1976, the Tangshan earthquake caused a power loss of about 1100MW. Four transmission lines from Beijing, Tianjin, Qinhuangdao and Luanhe were interrupted, resulting in a complete power outage in Tangshan area, which brought great difficulties to disaster relief after the earthquake.

In 1996, there was an earthquake in Baotou, Inner Mongolia. Zhangjiaying Substation lost power due to the broken lightning arrester of the bus bar and the protection of the bus differential, which eventually led to the power failure of the whole station. Among them, the total output of the whole network is 730MW, and the direct economic loss of the power sector is as high as 0.1 billion yuan.

In 1999, the Jiji earthquake in Taiwan caused a total of 543 transmission towers to collapse, tilt and deformation, and foundation displacement, which eventually led to power outages in central and northern Taiwan. The earthquake caused a power outage in the Hsinchu Industrial Park, which severely affected about 239 high-tech companies and caused losses of about US $0.313 billion.

In 2008, the Wenchuan earthquake caused a total of 247 substations above 35kV to be damaged and 29 were seriously damaged. More than 2700 lines of 10kV and above were damaged, and 162 lines were completely damaged, resulting in power outages for 4.0507 million users. The earthquake caused a loss of nearly 400 kilowatts of Sichuan power grid, a direct economic loss of 10.66 billion yuan, and the reconstruction cost will exceed 31.3 billion yuan.

The seismic isolation technology of electrical equipment is based on the further optimization and development of seismic design of electrical equipment, which provides more effective new ideas for seismic resistance of electrical equipment.

Application of Electrical Equipment Seismic Isolation Engineering

Since 2008, there are more than 30 application projects of seismic isolation devices for electric power facilities in China. The shear-type and pull-type aluminum alloy shock absorbers and anti-overturning combined laminated rubber isolation bearings developed by the China Institute of Current Science have been successfully applied in 220kV Xiameng Substation in Sichuan and 330kV Linjiang Substation in Gansu, with remarkable economic benefits and research results reaching the international advanced level.

In addition, seismic isolation technology has been successfully applied to Ximeng-Shandong, Lingzhou-Shaoxing, Mengxi-Tianjin South, Yuheng-Weifang and other UHV power transmission and transformation projects.

Seismic isolation devices are widely used in 750kV substations in Yili, Aksu, Wusu, Kashgar, Kuqa, Bachu and other 750kV substations in the 8-degree zone, ensuring the safe and stable operation of substation electrical facilities in Xinjiang. In addition, seismic isolation devices for power facilities have also been widely used in dozens of 110-500 kV substation projects such as Jiangsu Longhu, Baolan Passenger Dedicated Line, and Sichuan Seda.