Double loop network-based protection device free of main in-situ transformer and protection method

Abstract

The invention discloses a double loop network-based protection device free of a main in-situ transformer and a protection method. The double loop network-based protection device free of the main in-situ transformer comprises in-situ protection sub-machines, which are arranged at a high-voltage side, a medium-voltage side and a low-voltage side of a transformer respectively; the protection sub-machines are in hand-in-hand connection through double loop networks; each protection sub-machine collects the analogue quantity and the switch quantity of the side in situ, and is in bidirectional communication with the other protection sub-machines through the double loop networks to share data; each protection sub-machine comprises the same main and backup protection-integrated protection module for the transformer; a circuit breaker is arranged between each protection sub-machine and the side of the transformer; and each protection module trips off the corresponding circuit breaker according to the set backup protection action conditions and differential protection action conditions. By the double loop network-based protection device free of the main in-situ transformer and the protection method, the problem that a host of an existing protection device with the main transformer cannot be installed in situ is solved; and furthermore, multiple sets of differential 'conjunction gate' logics are adopted by the protection device, so that the protection reliability is improved.

Description

technical field [0001] The invention belongs to the field of relay protection for power systems, and in particular relates to a double-ring network-based non-owner-in-place transformer protection device and protection method. Background technique [0002] In conventional substations, the protection and monitoring equipment are separately grouped and arranged in a centralized manner, and the on-site wiring is complicated and mostly hard-wired, which brings more maintenance workload and unreliable factors. In recent years, conventional substations have been gradually replaced by smart substations that use "conventional transformers + merging units". The merging unit and smart terminal collect analog and switching values ​​on the spot, and connect them to the relay protection device in the main control room through optical fibers. , The long cable is replaced by optical fiber, and the secondary circuit is simplified. [0003] The intelligent station of "conventional transforme...

AI Technical Summary

Problems solved by technology

However, for transformer protection across intervals, more analog quantities need to be collected and the circuit is complex, which will inevitably cause the device to be too large to be installed on site. In addition, if the mode of "slave + host" is adopted, the It is difficult to find a suitable place to install the host according to the operation and maintenance regulations of the power system.

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