A full-coverage phase-shifting transformer differential protection method and system
A phase-shifting transformer, differential protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as failure to cover fault points
Active Publication Date: 2022-04-01
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
Since the phase-shifting transformer consists of two transformers, a single conventional differential protection scheme cannot cover all fault points of the entire equipment
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[0097] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0098] It should be understood that the step numbers used herein are only for convenience of description, and are not intended to limit the order in which the steps are performed.
[0099] It should be understood that the terminology used in the description of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification and the appended claims, the singular forms...
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The invention discloses a full-coverage phase-shifting transformer differential protection method and system, and relates to the technical field of phase-shifting transformer differential protection. The method includes: according to the equivalent model of the phase-shifting transformer, obtaining the electrical balance differential current of the primary side of the phase-shifting transformer, the electrical balance differential current of the secondary side of the phase-shifting transformer, the magnetic balance differential current of the series transformer, and the magnetic balance difference of the parallel transformer dynamic current; when any of the phase-shifting transformer primary side electric balance differential current, phase shifting transformer secondary side electric balance differential current, series transformer magnetic balance differential current and parallel transformer magnetic balance differential current exceeds the corresponding If the preset threshold is used, it is judged that the phase-shifting transformer is faulty, and the outlet of the protection action is controlled to trip. The invention constructs two magnetic balance equations and two electric balance equations aiming at the structural characteristics and current relationship of the phase-shifting transformer, and is a differential protection for the phase-shifting transformer that can fully cover all fault points.
Description
technical field [0001] The invention relates to the technical field of relay protection for phase-shifting transformers, in particular to a full-coverage differential protection method and system for phase-shifting transformers. Background technique [0002] As an effective device for controlling the power flow, the phase-shifting transformer is used in the power system. It uses the movement of the phase angle between the input and output to control the phase angle of the outlet position, so as to control the phase angle difference between the nodes at both ends of the next-level line to control the active power. power transfer size purposes. The phase-shifting transformer (PST) is composed of a series transformer and a parallel transformer, and the secondary side (delta ring) of the series transformer (ST) and the secondary side of the parallel transformer (ET) are connected in three phases. Since the phase-shifting transformer consists of two transformers, a single conven...
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IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 刘玮屠卿瑞李一泉
Owner GUANGDONG POWER GRID CO LTD