Virtual instrument-based relay protection secondary circuit simulation method

Abstract

The invention discloses a virtual instrument-based transformer substation relay protection secondary circuit simulation method. A relay protection accident caused by a secondary circuit fault is difficult to analyze and judge by the conventional method and is difficult to represent by a test method, and power failure is always required, so that the accident is not handled quickly and effectively. The method comprises the following steps of: analyzing the function and property of a simulated relay protection secondary circuit, the types and numbers of elements and the numbers, states and properties of input and output interfaces on the secondary circuit; and calling various virtual relays, a virtual independent element and a user customized control, performing logical configuration by using a logic element according to the simulated relay protection secondary circuit to establish a virtual relay protection secondary circuit, and simulating by using the virtual relay protection secondary circuit. By the method, problems such as contact competition, a secondary parasitic circuit and the like of relay protection can be researched accurately, and design defects of a relay and the relay protection secondary circuit can be found by a simulation experiment.

Description

technical field [0001] The invention relates to the application field of a substation relay protection secondary circuit, in particular to a virtual instrument-based relay protection secondary circuit simulation method. Background technique [0002] Relay protection is one of the important components of the power system, which is responsible for controlling the smooth operation of the power system and ensuring the safety of the power system. The secondary circuit is the core component of relay protection, commonly known as the "nervous system" of the power system, and it forms a complete protection network together with the relay protection device. In view of the importance of the secondary circuit, the power system departments at all levels and related equipment manufacturers have always attached great importance to it, and put forward various methods and measures to solve the problem of the secondary circuit. Conduct audits, ②Traditional manual alignment inspection is use...

AI Technical Summary

Problems solved by technology

However, the defects of the secondary circuit have the characteristics of sporadic and concealment, and the traditional method of testing the secondary circuit has great limitations, which are manifested in: ① It is not intuitive, especially for complex secondary circuits, it is difficult to rely on manual drawings to review It is found that the parasitic circuit and contact competition in the secondary circuit, ② It is difficult to completely verify the correctness of the secondary circuit in the protection transmission test, and the transmission test is relatively easy to verify the positive logic, but the negative logic is not easy to be verified comprehensively, and some special circuits rely on the transmission The test is still difficult to verify. ③ For relay protection accidents caused by secondary circuit defects, it is difficult to analyze and judge with conventional methods, especially for the secondary circuit in operation, it is difficult to reproduce through the test method, and often requires power failure, which is not conducive to accidents fast and efficient processing

Images