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Good wind with the help of force, infinite period of innovation
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After the first week of theoretical and practical study, the students have a preliminary understanding of equipment maintenance. This week, the students deeply understood the mechanical characteristics test, new reactor maintenance method, fault substation acceptance and other maintenance operations, directly experienced the online monitoring technology, 4G distribution control ball and other technological innovation, and triggered a number of thoughts on the innovative development of the transformer maintenance discipline.
In depth field practice
One
Mechanical property test
The mechanical characteristic test is that before the line is put into operation, the transformer maintenance personnel use special instruments to test the mechanical characteristics of the switch or switch, such as opening and closing time and speed, switch travel, and minimum action voltage. If the requirements are met, the corresponding maintenance test report shall be issued and submitted to the operation and dispatching department.
Preparation before standardized operation
Read out the work ticket
Pull out the handcart switch
Sweeping switch
Test equipment wiring
Personnel division debugging equipment
In the exhibition substation and Taoxian substation, master Yang led the students to watch the mechanical characteristics test of the switches of the six maintenance classes to be put into operation.
Remove GIS knife gate shell
Non contact measurement
On line monitor
Observe and learn
In Huanggang substation, students observe and study the new circuit breaker online monitor. Compared with the traditional test instrument which needs power cut operation, the advantage of this monitor is to realize non-contact measurement by using electromagnetic coupling technology, to complete the live detection of the mechanical characteristics of the circuit breaker (or disconnector), and to calculate the action time and stroke curve of the circuit breaker (or disconnector) by obtaining the transient data of the motor current.
Preparation test for dismantling the knife gate shell
Two
Minor repair of new reactor
Oil immersed magnetically controlled shunt reactor, with the advantages of reliable structure, low noise, advanced performance, low loss and low cost, has been gradually introduced into various substations in recent years. At present, only two substations under the jurisdiction of transformer maintenance room have introduced oil immersed magnetically controlled shunt reactors (Zhang Guan transformer and Shi Guan transformer). This week, students were lucky to visit and study the small repair site of the new reactor in shiguanbian.
One
Leakage defect of reactor sleeve
Two
Replace the aging rubber gasket of casing
Three
Replace the oil level gauge
Four
Remove the moisture absorber
Five
Replace the silica gel in the moisture absorber
Six
Job site with clear division of work
The maintenance method of oil immersed magnetically controlled shunt reactor can be compared with that of transformer. This minor repair is the first work order. The main work content is to replace the aging rubber pad of oil leakage sleeve, evaluate the oil quantity of oil conservator, replace the oil level gauge, install rain cover, replace the silica gel of moisture absorber, etc.
Three
Acceptance site of Dongting substation
In April 2019, the 10kV switch cabinet of Dongting substation exploded. The cause of the accident was identified as water seepage and toxic gas emission in the underground cable trench, resulting in oxidation of the switch contacts in the switch cabinet. In order to prevent such accidents, new type C-GIS high-voltage switch cabinet shall be replaced at 10kV side of Dongting substation. SF6 gas insulation shall be adopted for the bus bar in the cabinet, vacuum insulation shall be adopted for the switch, and the sealing level shall be greatly improved to prevent the moisture and toxic gas in the cable trench from entering the cabinet.
Acceptance site
Vacuum circuit breaker
Closed contact
Prospect of high and new technology
After two weeks' visit and study, the students have a deep thought on the major of substation maintenance. The technical innovation of traditional maintenance specialty is mainly for the installation methods of common tools or equipment. With the continuous promotion of ubiquitous power Internet of things construction, technical and management innovation will lead the future development of substation maintenance specialty.
No.1
Visual management and control system -- solving the problem of monitoring vacancy
At present, 4G ball control technology is introduced into each maintenance operation site, which mainly relies on the mobile Internet to live broadcast the maintenance operation in real time, realizes the real-time remote monitoring and guidance of the maintenance operation site, enhances the control of the maintenance operation risk, and effectively protects the safety of equipment and personnel. On the other hand, the application of ball control also innovates the post control link, through which the operation can be summarized and analyzed in an all-round way.
No.2
Intelligent storage system -- solving the problem of spare parts storage efficiency
Before maintenance, sometimes there is a problem that preparation time is too long due to improper management of spare parts. In order to better complete the substation maintenance, the spare parts, tools and instruments can be positioned and placed, and the data can be transmitted and stored in the intelligent storage system, so as to facilitate the access and use management of the maintenance spare parts, tools and instruments.
No.3
Innovative application of on-line monitoring system in Maintenance Specialty -- digitalization of maintenance work
Traditional online monitoring system is widely used in the field of operation and maintenance. Through real-time acquisition of equipment data and analysis, potential defects are found in advance, which provides convenience for the inspection work of operation and maintenance personnel. Similarly, in the future, online detection management can also be promoted and applied in the field of maintenance. On the one hand, it can realize the digitalization of maintenance work, and make the maintenance work more directional by quantifying the health status of equipment, which is conducive to the development of condition based maintenance; on the other hand, online monitoring system can more truly reflect the health status of equipment and reduce the failure probability. Taking the new on-line monitor of circuit breaker as an example, it can collect the "first time" action characteristics of circuit breaker after fault, and provide more effective data for maintenance work.
Inheriting the essence and keeping innovation
Problems are the starting point of innovation and the power source of innovation. Only on the basis of careful study of problems, the correct ideas and effective methods to solve the problems are put forward continuously, can we promote the continuous and in-depth development of practical innovation. At present, the development of the power grid is in the period of the new round of technological revolution and industrial revolution. The new information technology represented by big data, cloud computing, artificial intelligence and block chain technology is constantly breaking through, leading the future development of the power grid. Therefore, the essence and innovation of the new generation of power grid is the idea and purpose that our new generation of power grid should uphold.
Manufacturer: State Grid Shenyang power supply company
Editor: Guan Tianyi
Supervised by: Guan Tianyi
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