Line bus integrated backup protection method using pilot comparison principle based on the fault direction

Abstract

The invention discloses a line bus integrated backup protection method using a pilot comparison principle based on the fault direction. The method comprises the steps: taking a breaker as the center, determining the electrical elements related with the breaker and the backup protection functions, and incorporating the backup protection functions in the same protector to complete; determining the fault direction information is interacted among which protectors, and the mode for interaction of the fault direction information; comparing the fault direction information when a fault occurs, and determining the position wherein the fault is according to the compared result of the fault direction information; and determining the motion strategy for backup protection. The line bus integrated backup protection method using a pilot comparison principle based on the fault direction has the advantages of reducing the quantity of backup protection, simplifying the coordination relationship among backup protection, simplifying the control loop of the breaker, improving the reliability for working of a secondary system, being able to determining the fault position rapidly and reliably when the fault occurs, and improving the rapidity and the reliability of the backup protection motion.

Description

technical field [0001] The invention relates to the technical field of power system protection, in particular to an integrated backup protection method for line busbars based on longitudinal comparison of fault directions. Background technique [0002] In the current power system, the protection device is configured based on the electrical components, and most of the realization methods adopt a complete set of integrated main protection and backup protection. For example, there are complete line protection for transmission lines, transformers, busbars and other electrical components, transformer complete protection and busbar complete protection. The above-mentioned protection configuration scheme and working mode have been used for many years, providing an important guarantee for ensuring the safe and stable operation of the power grid. However, the above schemes and models also have certain deficiencies, which are mainly reflected in the following aspects: [0003] (1) T...

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Problems solved by technology

[0003] (1) The protection configuration scheme for electrical components is relatively complicated, and the number of protection devices required is also large, which reduces the reliability of the protection system and increases the maintenance and repair workload of the protection devices;

[0004] (2) The protection devices are relatively independent, and sometimes it is difficult to cooperate effectively between the protection devices of adjacent electrical components;

[0005] (3) Due to the protection configuration based on electrical components, one circuit breaker may correspond to the operation circuits of multiple protection devices, resulting in complicated secondary wiring and reducing the reliability of the secondary system

[0007] Most of the current microcomputer protection devices are complete sets of devices, that is, the main protection and backup protection functions are incorporated into the same protection device, so that while strengthening the main protection configuration, the backup protection configuration must also be strengthened, which not only does not meet the simplified backup protection configuration. The trend of development, more importantly, the coordination relationship between the backup protection has become more complicated, which will reduce the reliability of the backup protection system in some cases

[0008] The current backup protection function generally adopts the principles of distance protection and overcurrent protection based on local electrical quantities in terms of realization principles. Adopting the coordination principle of stepped time limits, there are problems such as complex protection coordination and long action delays. In some cases, there are even more serious problems such as backup protection misoperation or refusal to operate.

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