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Reliability Analysis of Relay Protection Automation Device

Reliability Analysis of Relay Protection Automation Device

  • Categories:Trade News
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  • Time of issue:2021-08-18
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【概要】The relay protection automation device provides support for the safe and stable operation of the power system.

Reliability Analysis of Relay Protection Automation Device

【概要】The relay protection automation device provides support for the safe and stable operation of the power system.

  • Categories:Trade News
  • Author:
  • Origin:
  • Time of issue:2021-08-18
  • Views:0
Information

The relay protection automation device provides support for the safe and stable operation of the power system. If the relay protection automation device has poor product quality, misjudgment of the protection function, improper operation and handling by personnel, and poor maintenance effect, the reliability and protection ability will not reach the expected effect, and even there will be unprotected This phenomenon will also have a huge impact on the safe operation of the entire power system. This also highlights the importance and necessity of reliability analysis of relay protection automation devices.

Introduction

With the rapid development of society and economy, under the constraints of the goal of “carbon peak and carbon neutrality”, the construction of a new power system with new energy as the main body has become a new trend, and the reliability of the power system by a larger and more complex new power grid , Stability puts forward higher requirements and new challenges. In the more than ten years of rapid development of the power system, automation technology has been widely used in the field of relay protection, which has improved the reliability of the power grid. As a barrier for the safe operation of the power grid, the relay protection automation device is of importance to its reliability.

Relay protection automation device and working principle analysis

The application scenarios of relay protection automation devices include power generation, power transmission and transformation, power distribution and other aspects of the power system. Taking power transmission and transformation as an example, the protection objects of the relay protection automation device are mainly high-voltage transmission lines and substations. The protection functions of the relay protection automation device mainly include the following three aspects: First, the main transformer protection, the protection function is current protection, Voltage protection, backup protection, etc. are the main ones; the second is line protection, which is mainly based on overcurrent protection and reclosing protection; the third is bus protection, whose protection functions are mainly two-stage charging protection and over-current protection.

product quality reliability

Improve the R&D production process and enhance the product quality

Improve product quality through continuous improvement of R&D and production processes to enhance the reliability of relay protection automation devices to ensure the safe and stable operation of the power system. To put it simply, the failure of a single relay protection automation device will not have a significant impact on the reliability of the power system, but for the new power system with new energy as the main body, the stability of the power system is based on the relay protection automation device. Basically, the failure of a single relay protection automation device should also be avoided as much as possible. The more complex a single device is, the greater the possibility of device failure. Therefore, it is necessary for the relay protection device manufacturer to improve the level of research and development, improve the production process, and simplify the relay protection automation device. On the one hand, it can save costs and achieve quality improvement. The effect of increasing efficiency, on the other hand, can reduce its own load, reduce chip pressure, and improve the efficiency of protection functions.

The production process will also have a non-negligible impact on product quality. The production process is mainly reflected in the production process, raw materials, and personnel operations. Relay protection automation equipment has strict specifications in the production process. According to the relevant characteristics of electronic devices, it is necessary to compile welding, assembly, testing, and aging production management specifications, improve the welding level, strengthen product assembly capabilities, etc., and ensure that the products are free from virtual products through testing. Product quality problems caused by improper production such as welding, missing welding, and electrostatic breakdown. The quality of raw materials directly determines the quality of the final product and affects the life cycle of the product. Take the thyristor as an example. In the experiment of small signal input, large current and large voltage output, the low-quality thyristor cannot play a long-term amplifying effect, which leads to the failure of the experiment. . In addition, the training of production personnel should be strengthened to ensure that production personnel can carry out production in strict accordance with production management standards, take anti-static measures, and treat each link of production with a serious and responsible attitude.

Abundant testing methods to improve product qualification rate

As the last link before leaving the factory, technology and manual methods should be used to strengthen the testing of automatic relay protection devices in order to increase the pass rate of products. The manufacturer of the protective relay device shall ensure the reliability of the software function of a single device before the product leaves the factory by means of automatic detection system, aging room aging, manual sampling and other methods. At the same time, the hardware of a single device is tested on a regular basis, and EMC tests are performed on a single device from time to time to ensure the reliability of the hardware functions of the relay protection automation device. Through software and hardware testing, the protection efficiency is improved.

Functional reliability

Relay protection technology innovation

Facing the rapid development and progress of science and technology and the increasingly large and complex power system, the relay protection automation equipment should also be continuously improved and innovated. For example, multiple relay protection automation devices can locate faults through recorded fault currents, fault waveforms, etc., and at the same time can avoid false alarms due to failure to correctly analyze the fault point. In addition, with the advancement of technology, millisecond-level protection actions can be realized, and the sampled data is more accurate.

With the emergence and rapid development of smart substations, power grids have become increasingly complex, and some problems are prone to occur during operation, breaking the "four basic characteristics" of traditional relay protection. The working time of the protection unit is prolonged, and at the same time, a single component may cause operation errors and malfunction. This violates the rapid protection independence of relay protection. The connection system configuration file and secondary equipment are affected. Because there is no visual "virtual circuit" "Aided by ", there is no clear breakpoint for maintenance isolation, which increases related risks such as on-site protection and maintenance of substations. Therefore, it is necessary to continuously solve the contradiction between the time and choice of relay protection through the technological innovation of relay protection.

Protection function effectiveness

The protection function of the relay protection automation device is the key to realize the protection of the power grid. Taking the sudden change of current in the actual grid fault as an example, the relay protection automation device needs to sense the sudden change of current through current sampling, and judge whether the grid is faulty by comparing the degree of current sudden change and the relationship between the current magnitude and the setting value, so as to take corresponding protection alarms or Action to achieve the effect of protecting the power grid. Therefore, product R&D and design personnel should fully consider the actual operation of the power system, and rationally design the protection logic of the device protection function according to the characteristics of the power system, while reducing the complexity of the code, so that the effectiveness of the product protection function is continuously improved. In addition, in the process of setting the value of the relay protection automation device, through the program calculation of system fault data, etc., it is possible to accurately judge whether the relay protection automation device setting value is reasonable and whether the protection function can play a role.

Operational reliability

Staff reliability

The reliability of the relay protection automation device is reflected in the quality and function of the product on the one hand, and on the professionalism of the operators, including the professionalism and comprehensive quality of the operators. Here, the operator is required to take a serious and responsible attitude and correctly handle the emergencies encountered in the daily operation process to ensure that the product can perform the protection function normally.

In addition, power companies should regularly train maintenance personnel, continuously strengthen and improve relay protection maintenance skills, and strengthen the work quality of maintenance personnel. It is clarified that the relay protection maintenance personnel should strictly follow the maintenance process one by one during the maintenance process to prevent fluke and ensure that the relay is not worn and the relay contacts are not stuck, burned, or stuck. Check whether the position of the relay protection automation device panel display, indicator light, connecting wire, transfer switch, soft and hard pressing plate is correct, etc. Through training and practical operation training, continuously improve the efficiency of the maintenance of the relay protection automation device and strengthen its operation effect.

regular maintenance

Regular maintenance is an indispensable part to ensure the effective operation of relay protection automation devices. Make preparations before regular maintenance, including understanding the wiring of the equipment and the installation of the secondary circuit through the drawings, and understanding the recent operation of the product. In the maintenance process, taking into account the safety, the relay protection automation device should be set in the maintenance state, and the secondary circuit, the insulation condition of the secondary circuit, the screen cabinet, and the effectiveness of the protection function should be checked. After all inspections are over, it is strictly forbidden to plug in or pull out the plug-in. The maintenance process should be carried out in strict accordance with the operation manual to avoid missing items and reduce the possibility of product errors.

Conclusion

With the continuous development of economy and society, the continuous advancement of science and technology, the competition in the power industry has become more intense, and the requirements have also been continuously improved. If power companies want to gain a foothold in the highly competitive and demanding power industry, they need to use quality relay protection automation devices and train a group of skilled, capable and responsible employees. Through the reliable quality, reliable function and reliable operation of the relay protection automation device, the safe and stable operation of the power system is guaranteed, and the core competitiveness is maintained in the fiercely competitive power market.

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Powered by 300.cn    苏ICP备10073151号