Measures to improve the correct rate of relay protection action - Database & Sql Blog Articles

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1. The goal and focus of relay protection work is a large number of relay protection devices. The relay protection work is very numerous, but its overall goal should be to continuously improve the correct operation rate of the protection device, especially to reduce 220 kV and above. Due to accidents caused by relay protection, the system avoids grid stability damage and large-scale power outage accidents and main equipment damage accidents caused by relay protection and power grid accidents of 110 kV and below.
2. Procedures for relay protection work and anti-accident measures Relay protection work must be handled in accordance with procedures and regulations. In order to strengthen relay protection management, Jiangsu Power Grid Dispatching Co., Ltd. compiled and printed power system relay protection regulations and anti-accident measures, and compiled 14 technical documents. At the same time, in the field work of relay protection, anti-“three mistakes” and anti-“violation” activities were carried out, emphasizing “safety first, prevention first”, and advocated meticulous work style and dedication and love.
The power grid relay protection and safety automatic device anti-accident measures are formed on the basis of summing up the lessons learned. He is an important technical measure to improve the correct rate of device operation and must be implemented. In implementing the power grid relay protection and safety automatic device anti-accident measures, the Jiangsu Province has formulated the implementation rules in accordance with the principles and spirit of the Ministry's “points” and the actual situation of the Jiangsu power grid, and clearly prioritized the implementation process. The specific situation is implemented. It is stipulated that the projects put into operation in 1995 and later must be constructed in accordance with the anti-accident measures (referred to as counter-measures), and the construction without the counter-measures will not be applied, which has received good results.
3. Infrastructure management of relay protection devices In the “Regulations on Quality Supervision and Management of Power System Relay Protection and Safety Automatic Devices”, the relay protection devices and relays that are put into operation must be officially certified and tested. Tested for excellent performance equipment. The secondary construction drawing must be submitted to the operating department. The operating department can exercise the safety veto power during the project acceptance, and should strictly control the project when it is put into operation, eliminating the hidden dangers of incorrect relay protection. Only when the infrastructure, design, manufacturing, and operation departments work together can the primary and secondary equipment of the infrastructure project be put into production at the same time, leaving no problems, laying a good foundation for the safe operation of the power grid.
4. The configuration and selection of relay protection devices are reasonably configured for grid protection. The selection of protection devices with reliable quality, excellent performance and advanced technology is the prerequisite for ensuring correct operation of relay protection. The selection principle of relay protection devices in Jiangsu Province is based on the spirit of Shenzhen National Grid Operation Working Conference in March 1996. It relies on technological advancement to improve the operation level of relay protection, and selects protection devices with reliable quality, excellent performance and advanced technology, and attaches great importance to protection. Standardization of device hardware and software. Through the investigation of the manufacturing department and the specific situation of Jiangsu, the new construction project adopts the microcomputer protection in principle and proposes a specific configuration plan.
5. Renewal of relay protection devices The old and old protections that do not meet the “four unified” technical requirements in the power grid are hidden dangers of improper relay protection and grid accidents, and must be upgraded. The cost of renewal and transformation can be solved by combining the items listed in the infrastructure construction with the special items of fixed assets transformation. The updated objects are mainly 220 kV tube high frequency protection, rectification type protection, transistor ("A", "B", "C") type protection, 220 kV bus line and phase comparison type maternal protection of stable 110 kV bus. , generator transformer component protection, light-type recorder for important plant stations. It should also promote the use of high-precision time relays, integrated circuit current, voltage relays, ungrounded systems, small current line selection devices, and DC power line selection devices.
6. Eliminate the hidden dangers of relay protection devices According to the changes in the power grid structure, the relay protection setting calculation must be done in time, and the system protection settings should be adjusted in time to adapt to the changing power grid. The Jiangsu Power Grid Dispatching Institute and the power plants and power supply bureaus (Electricity Bureaus) in the province have compiled relay protection setting procedures and operation instructions. No accidents have occurred in the accidents over the years.
The defects and abnormal conditions of the relay protection equipment should be dealt with in time to ensure that the operating equipment is always in a normal state. The main shortage projects of Jiangsu Province in recent 220 kV system are: 15 in 1995, 24 in 1996, 21 in 1997 and 19 in 1998.
For the common defects and hidden dangers found in the operation, Jiangsu Province timely formulated countermeasures and implemented them. In recent years, five "reverse measures" such as "JGX-11D phase difference high-frequency phase self-holding loops are correctly used" and the precautions for transistor protection operation have been formulated; the WXB-11 series microcomputer protection version has been upgraded; the relay protection high frequency has been proposed. Channel improvement measures, etc.
7. Strengthening the safety inspection of relay protection work Relay protection is the focus of safety inspection. For the characteristics of power grid operation, the key point of the summer safety inspection is to check whether the system relay protection setting principle is in compliance with the ministerial regulations. . The focus of the winter safety inspection is to check against snowstorms, fogging, and fire prevention. In particular, it is necessary to emphasize the high-frequency protection of the main line of the power grid and the operating rate of the bus differential protection. Prepare for accidents during major political events to ensure safe use of electricity.
8. Improve the quality of relay protection professionals to create a team of relay protection professionals with a high sense of responsibility, professionalism and high technical level. This is the need for modern large-scale power grid operation management. In the aspect of technical training, we should adopt the principle of “what is missing, apply what we learn, and base ourselves on on-site training”, and start a variety of training courses according to local conditions.
In order to meet the needs of the power grid dispatching operation and management departments, and provide technical support for the safe operation of grid relay protection, Jiangsu Power Grid Dispatching Institute has compiled a large number of relay protection devices and operation instructions.
9. Establishing the relay protection technology supervision system and implementing modern management According to the characteristics of the relay protection profession, it is necessary to improve and perfect the rules and regulations of the operation and management of the protection device. The files of relay protection equipment, operation and maintenance, accident analysis, periodic verification, defect handling, and implementation of countermeasures should be gradually adopted by computer management. Jiangsu Power Grid Dispatching Co., Ltd. has developed a management system for “Regulations and Regulations for Relay Protection Operation of Some Systems in East China Power Grid”, “Management System for Short-Circuit Capacity of Jiangsu Power Grid (For Relay Protection)”, “Relay Protection Setting and Equipment Table” Account management system, "fault information transmission and its application" management system, etc., and has been on the MIS network to achieve information resource sharing.
In order to integrate relay protection work into a standardized, normalized and scientific track, it is necessary to establish and improve a relay protection technology supervision system. In August 1997, Jiangsu Power Grid Dispatching Co., Ltd. prepared the Jiangsu Power Grid Relay Protection Technology Supervision Regulations to strengthen the professional management of relay protection and improve the operation and management level of relay protection in the province.
10. Implementing the reward and punishment system for follow-up inspection, strict assessment, and implementation of rewards and punishments can promote the development of relay protection work. The Jiangsu Provincial Electric Power Bureau strengthened the reward and punishment for relay protection work in the management, and established a number of awards for the annual relay protection professional labor competition awards, and announced the winners and rewards at the provincial annual relay protection professional conference. At the same time, the province's subordinate factories and bureaus also formulated incentives and rewards for their own units, thereby enhancing the sense of honor and responsibility of relay protection personnel.