Storm No. 3 caused significant damage to the power transmission grid in Quang Ninh area when the 500kV line and 4 transformer stations (TBA) 220kV all had problems. With the continuous efforts of Northeast Power Transmission 1, all problems have been basically resolved, promptly restoring production activities of power plants, quickly re-supplying electricity to industrial, commercial and service loads in the key economic region of the North.
The Northeast 1 Power Transmission Line currently manages 6 substations (1 500kV substation and 5 220kV substations) with a total capacity of 3,200MVA with 38 transmission lines, 10 500kV lines and 28 220kV lines. These are all transmission lines from thermal power plants in Quang Ninh, Hai Duong and Son Dong thermal power plant (Bac Giang) to the national transmission grid. However, due to the terrain, the transmission grid in Quang Ninh area has a volume passing through high mountains accounting for about 75-80%, leading to damage due to heavy rain and storms and the recovery work is extremely difficult.
Mr. Pham Minh Khoi, Deputy Director in charge of the Northeast 1 Power Transmission Line, said: Determining that the damage caused by the storm could be very large, from September 6, all the manpower of Northeast 1 Power Transmission Line plus 120 people from 5 other power transmission units were mobilized, ensuring 24/7 duty at the substations. After the storm reduced its intensity, the unit immediately divided into teams to inspect the power lines, detecting damage that needed to be handled. In particular, the unit focused on handling the incident of the 500kV line. At 1:00 a.m. on September 9, the technical staff withdrew from the pole after maintaining the last point at pole 19-20 of the Thang Long Thermal Power Line to the Quang Ninh 500kV station to return the grid to the national dispatcher.
With the spirit of resolving the problem as quickly as possible to close important circuits, Northeast Power Transmission 1 mobilized human resources in 3 shifts, organizing construction 24/7. As of September 13, all affected 220kV and 500kV substations have been completely restored, equipment is operating normally, and the wiring diagram has returned to the same as before storm No. 3. Thanks to that, it was possible to promptly connect and release the capacity of Son Dong Thermal Power Plant (Bac Giang) and Uong Bi Thermal Power Plant as well as supply electricity to important industrial loads in Quang Ninh province so that businesses can restore production.
At the 220kV Yen Hung substation, a line bay and a transformer have been restored, the remaining transformer is ready to be energized and is awaiting restoration orders. For the 220kV Trang Bach - Yen Hung line, due to the severe impact of wind and tornadoes that caused 2 poles to fall (in Uong Bi City), since September 8, the Dong Bac 1 Power Transmission Company has also focused all its forces and mobilized support from the shock units of the power transmission of provinces and cities to urgently re-erect 2 poles and pull wires to restore power. It is expected that on September 18, the unit will re-energize and operate the 220kV Trang Bach - Yen Hung line.
Along with the recovery work, the Company has also actively supported other units in the electricity industry. Typically, with Uong Bi Thermal Power Plant and Thang Long Thermal Power Plant, the Company has supported the replacement of lightning arresters, current transformers, and the replacement of the feeder wires of the 220kV Uong Bi - Yen Hung and Uong Bi - Trang Bach lines...
The 220-500kV power transmission grid in the Northeast region is connected to many thermal power plants in Quang Ninh, such as: Mong Duong Thermal Power Plant, Cam Pha, Quang Ninh, Mao Khe, Uong Bi... The early completion of incidents by the Northeast 1 Power Transmission Company has ensured readiness to release the capacity of thermal power plants, contributing significantly to ensuring the safety and security of power supply to the national system.
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