Intelligent potential transformer (PT) automatic connection and separation switch device

Abstract

The invention discloses an intelligent potential transformer (PT) automatic connection and separation switch device. Secondary voltages of two sets of PTs are connected to a PT circuit of the device, the transformers converts voltage signals into small signal currents, and the small signal currents are adjusted into digital signals through an analog to digital (AD) sampling circuit and accessed into a digital signal processor (DSP). Section breaker positions, PT switch positions, section isolator positions and other analog input signals are accessed into a direct (alternate) current analog input control circuit to be subjected to voltage-reduction and alternating quantity removal processing and then converted into stable direct current 5V voltage small signals, the direct current 5V voltage small signals are accessed into the DSP, and the DSP carries out breakage with a 1ms timer and detects analog input values continuously. The two sets of PTs are simultaneously connected to a connection and separation operating panel of the device, the DSP carries out integrated judgment according to voltage sampling values and position information of the PTs to control a relay operating circuit on the connection and separation operating panel, and then the connection, separation and switch of the PTs are completed.

Description

technical field [0001] The invention relates to the field of automatic control devices, in particular to an intelligent automatic parallel-disconnect switching device for PTs. Background technique [0002] Potential transformer (PT) is a power facility that must be used in a substation. It isolates the high voltage on the primary side from the secondary side and provides standard secondary voltage for use, including measuring meters, voltage sampling for relay protection, etc., in It occupies a very important position in the power system. PT operation mode is mainly divided into two types: single bus section operation mode and double bus operation mode. For single-bus section operation mode, two sections of busbars, one PT for each section of busbar, when I busbar PT exits operation due to maintenance or failure and cannot provide secondary voltage, the relay protection of I busbar may occur due to voltage loss Misoperation, at this time, the II bus PT is needed to mainta...

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Problems solved by technology

[0003] At present, most of the traditional devices that meet the above-mentioned PT parallel switching are still in the manual operation stage, and only support manual parallel, de-parallel and switching. The structure is simple, the function is single, and it does not support intelligent logic judgment. When the mother PT fails and cannot provide the secondary voltage, the parallel or switching operation cannot be performed in time, causing the secondary circuit of the I mother to lose voltage for a long time, which may cause malfunction of the relay protection and some meters cannot be m

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