China News Network Taiyuan, 8 August Topic: Power supply personnel on the front line of flood prevention and disaster relief: Patrol inspection and emergency repair race against time
Author: Gao Yuqing, Hu Duo, Qu Siyuan
"After four and a half hours of patrolling the 4 kV Jinhuo line after the rain, we did not find any faults that affected the safe operation for the time being, which is our greatest satisfaction." Li Zhiming, head of the fourth shift of operation and maintenance of the first branch of the operation and maintenance department of the State Grid Shanxi ultra-high voltage transmission company, said on the 500nd.
The picture shows the emergency repair personnel of the Pingding County Power Supply Company in Xidayan Village, Niangziguan Town, Pingding County, carrying out emergency repairs to the line most affected by the flood. Photo courtesy of State Grid Shanxi Electric Power Company
Recently, affected by Typhoon Du Surui, heavy rainfall occurred in many places in Shanxi, and Jinzhong, Yangquan, Xinzhou and Datong had greater flood conditions.
At the critical period of peak summer power supply, State Grid Shanxi Electric Power organized flood prevention and disaster relief to ensure power supply, strengthened special patrol and special protection of line equipment, and timely repaired damaged power facilities, and there were no large-scale power outages and power outages for important users in the province.
The picture shows that the transmission and transportation inspection center of Datong Power Supply Company carried out special inspections of the line after rain and made every effort to escort the safe operation of the power grid. Photo courtesy of State Grid Shanxi Electric Power Company
Special patrol and special protection to ensure the safe operation of the power grid
"Ensuring UHV power grid, backbone network frame, power supply, and important places" is the top priority of flood prevention and disaster relief and power supply. The ultra-high voltage substation company and the ultra-high voltage transmission company under State Grid Shanxi Electric Power have strengthened special inspection and special protection of equipment to ensure the safe and stable operation of 4 UHV channels and 14 500 kV external transmission channels, and the high-load operation of Yanhuai DC.
During this period, the State Grid Shanxi UHV Transmission Branch sent nearly 200 people and 60 vehicles to carry out special patrols and special protection of the line as soon as possible after the heavy rain, and the intelligent control center, each transmission and transportation inspection branch and the grassroots team simultaneously carried out three-level monitoring, focusing on hidden dangers such as landslides and tower tilts that may be caused by secondary and derivative disasters of heavy precipitation, and conducting key inspections near the transmission tower.
The picture shows the staff of Shanxi UHV Transmission Company checking the operation of ultra-(extra) high-voltage transmission lines after rain throughout the province to ensure the safety and stability of the lines. Photo courtesy of State Grid Shanxi Electric Power Company
In addition, State Grid Shanxi Electric Power uses the natural disaster early warning system to issue early warnings to its subordinate units in advance and continuously issue important work reminders.
Due to the topography, the 500 kV Jishan substation is prone to drainage obstruction, resulting in flooding of cable trenches. On August 8, the operation and maintenance personnel of the State Grid Shanxi UHV Substation Company once again carried out a field drill on heavy rain drainage of the station.
"The drain pipe is connected, the power supply is switched on, and the lifting position is fixed." "Received. All personnel evacuated the site and prepared for start-up. Zhao Yue, the head of the company's operation and maintenance team, quickly pressed the start button, and the emergency drainage cabin system began to drain normally.
"We temporarily set up three emergency rescue teams to deal with emergencies. The first time after the rain, a special inspection was carried out, and he did not dare to relax at all. Qin Pengfei, deputy head of the operation and maintenance class, deployed at the pre- and post-shift meetings.
The picture shows the substation operation and maintenance personnel of Yangquan Power Supply Company carrying out a special inspection of rainy equipment at the 220 kV Suyu Station. Photo courtesy of State Grid Shanxi Electric Power Company
Grab the Fix Electricity and race against time
At 7:29 on July 10, the 16 kV 10 Hongtiguan line in Pingshun County, Changzhi, caused a persistent ground fault. Emergency repair personnel raced against time and braved the rain to conduct on-site investigation of faulty lines.
Later, the staff found that a large tree in the scenic area of Tongtian Gorge fell on the transformer, causing the line to quickly break and trip. After the fault is identified, under the premise of safety protection, power failure, power inspection, and grounding wire. When the rain stopped, the power supply personnel immediately climbed the pole and began to repair the damaged equipment, eliminate the fault as soon as possible, and restore the power supply in time.
"While rushing to repair the electricity, we also use WeChat groups, moments and other methods to do a good job of publicity and explanation to power users in the power outage area, remind everyone to pay attention to the safe use of electricity after the rain, and timely understand the cause of the failure, the power restoration time and other information." Wang Linbo, head of the marketing department of Pingshun Power Supply Company, said.
"From the evening of the 29th to the afternoon of the 30th, we inspected the whole line, there was no big problem, it was much more practical." Chang Shaojian, director of the Dongsitou Power Supply Institute in Pingshun County, said.
During this period, he convened the staff of the firm to conduct a comprehensive inspection of the power facilities in the soft soil, cross-river, low-lying and other areas in the jurisdiction, focusing on carefully inspecting the towers washed by heavy rain and the surrounding environment, to understand whether the foundation of the towers was stable, whether the towers were tilted, and whether the cables were intact and stable.
The picture shows the staff of Xiyang County Power Supply Company replacing the low-voltage insurance in Hanjiagou in Sandu Township. Photo courtesy of State Grid Shanxi Electric Power Company
This time, State Grid Shanxi Electric Power urgently mobilized 20 power generation vehicles and 74 generators from Taiyuan, Changzhi and other places to maintain power to governments, hospitals and communication base stations in the disaster-stricken areas to meet the basic electricity needs of the disaster-stricken areas.
Up to now, the company has dispatched a total of 1133,315 emergency repair personnel and 65 emergency repair vehicles. Through three days and two nights of emergency repairs, all 330 trunk lines have resumed power transmission, 5209 branch lines have been restored, <>,<> substations have been restored, and most of the disaster-stricken lines have been repaired and power supply has been restored.
The picture shows the staff of Xiyang County Power Supply Company replacing the low-voltage insurance in Hanjiagou in Sandu Township. Photo courtesy of State Grid Shanxi Electric Power Company
In addition, State Grid Shanxi Electric Power set up five on-site emergency repair headquarters in Xiyang County, Pingding County and other severely affected areas, and recruited sufficient emergency repair teams, emergency repair equipment, communication equipment, lighting equipment and other personnel and materials in accordance with the principle of "two shifts". At present, full efforts are being made to carry out emergency repairs. (End)