Multi-terminal remote current transformer checking system based on global positioning system (GPS)

Abstract

The invention discloses a multi-terminal remote current transformer checking system based on a GPS and belongs to the field of electrical equipment checking. The checking system comprises n (n>1) current transformers, a GPS synchronization module, a checking module, a microcomputer protective device and a result analysis module, wherein the output of the GPS synchronization module is connected with the input of the checking module, the output of the checking module is connected with primary inputs of the current transformers, outputs of the current transformers are connected with the input of the microcomputer protective device, and the output of the microcomputer protective device is connected with the result analysis module. According to the checking system, the GPS module is used for guaranteeing the synchronism of the checking, so that synchronization checking work is convenient and feasible and high in accuracy; the reliability of checking results can be guaranteed due to the checking module; staff adjust parameters to eliminate time differences after the result analysis module gives signal differences, and normal operation of the microcomputer protective device can be ensured.

Description

technical field [0001] The invention belongs to the calibration field of electric equipment. Background technique [0002] With the popularization of smart substations, the number of smart substations has increased by leaps and bounds. In the early stage of smart substation construction, there will be a pattern of alternate coexistence of smart substations and conventional substations. In this case, for optical fiber longitudinal protection, one end is an electronic transformer and the other end is a conventional transformer, and the sampling time is not synchronized because of the different characteristics of the current transformers at both ends. On the other hand, even if both ends are smart substations, the characteristics of the electronic current transformer and the combined unit are different batches of equipment from different manufacturers, resulting in inconsistency in characteristics. This asynchronous AC sampling caused by inconsistency in equipment characteris...

AI Technical Summary

Problems solved by technology

In this case, for optical fiber longitudinal protection, one end is an electronic transformer and the other end is a conventional transformer, and the sampling time is not synchronized because of the different characteristics of the current transformers at both ends.

On the other hand, even if both ends are smart substations, the characteristics of the electronic current transformer and the merged unit are different batches of equipment from different manufacturers, resulting in inconsistencies in characteristics.

This kind of asynchronous AC sampling caused by inconsistent equipment characteristics has a great impact on the optical fiber longitudinal protection, which may cause malfunction or refusal of the protection device

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