At 23:08 on April 23, with the dispatcher of East China Power Control Sub-center, the State Grid Jiangsu Power Co., Ltd. 500 kV Zhongwu Substation No. 5032 switch was closed; on the 24th, State Grid Zhejiang Electric Power Co., Ltd. 500 The localization test project of the QV Qiao Substation passed the acceptance test, marking the first successful installation of the 500 kV substation of the State Grid Corporation with the full-scale localized protection device.
As the first line of defense for the stable transmission of electrical energy, the relay protection plays an important role in ensuring the safe and stable operation of the UHV AC-DC grid and the smart grid. In order to achieve the goal of reliable operation and efficient operation and maintenance of relay protection, in 2016, the company carried out research on relay protection technology system characterized by localization protection. In 2017, as a pilot unit, State Grid Jiangsu and Zhejiang Power took the lead in participating in the development, testing and trial operation of localized protection devices. The localization protection device adopts high protection, low power consumption, integrated hardware and software design concept, and the power consumption is half of the traditional one, and the volume is one-fifth of the traditional one. This new technology is characterized by localization, miniaturization, and plug-and-play, bringing relay protection to a new stage of development.
It is understood that the promotion and application of new technologies will effectively improve the reliability of grid relay protection. The localization protection device integrates the merging unit and the intelligent terminal, which reduces the protection action time by 25%~33%, the number of optical cable users decreases by nearly 60%, the number of protection panel cabinets decreases by more than 60%, and the whole station installation and debugging time is shortened by more than 70%. .
“The device is installed close to the equipment once, automatically collects the real-time data of the equipment once, and finds that the equipment automatically trips at the first time after the equipment failure, reducing the intermediate links and improving the quick-action and reliability of the relay protection.†State Grid Jiangsu Power Control Center Relay Cui Yu, director of the Protection Division, said.
The localization protection device can also use the automatic test technology to complete the substation on-site commissioning. The maintenance personnel only need to replace the device during the on-site inspection, which can greatly improve the operation and maintenance efficiency. The equipment maintenance and power failure time is shortened from the original 72 hours to 2.5. hour. At the same time, the fault repair time was shortened from the original 12 hours to 1 hour, the equipment power outage time was greatly reduced, and the grid operation reliability was further improved.
It is reported that the main equipment of the main transformer, busbar, line and circuit breakers of the State Grid Jiangsu Power 500KV Zhongwu Substation are equipped with localized protection devices, including 11 localized protection cabinets and 21 sets of protection devices. All types of full coverage; State Grid Zhejiang Electric Power 500 kV Qiaos Substation installed one set of localized line protection, bus protection, main transformer protection, and with the installation of intelligent management unit, the localized protection device is installed in the switchyard, with High IP protection level, good heat dissipation characteristics, low floor space, high reliability, and maintenance-free.
The company's first batch of 500 kV localized protection substation will be a successful pilot of the “third generation intelligent substation†relay protection technology, which will vigorously promote the company's relay protection professional to factory debugging, modular installation and replacement maintenance. New mode of operation and maintenance.
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