A METHOD FOR DETERMINING THE OPERATING STATUS OF A MV SWITCHING APPARATUS OF THE ELECTROMAGNETIC TYPE

    公开(公告)号:US20180267103A1

    公开(公告)日:2018-09-20

    申请号:US15542627

    申请日:2015-12-28

    Applicant: ABB Schweiz AG

    Abstract: A method for determining the operating status a MV switching apparatus, which comprises: one or more electric poles, each comprising a movable contact and a fixed contact adapted to be coupled or uncoupled during the switching operations of the switching apparatus; an electromagnetic actuator for actuating one or more movable contacts of the electric poles, the electromagnetic actuator having at least a test winding wound around a magnetic element; a capacitor bank for providing electric power to the electromagnetic actuator. The method comprises: providing a test signal (ST) to the test winding for an observation period of time (TO), the test signal having a waveform capable of exciting the magnetic element; obtaining first measuring data (VC) indicative of a voltage at first terminals (T1) of the capacitor bank during the observation period of time; obtaining second measuring data (VL, IL) indicative of a voltage at second terminals (T2) of the test winding and indicative of a current circulating along the test winding during the observation period of time; and, calculating estimation data (Ĉ, ICD, IC) indicative of the operating status of the capacitor bank at the end of the observation period of time on the base of the first and second measuring data, the first estimation data comprising a first estimation value (Ĉ) indicative of the capacitance of the capacitor bank.

    METHOD FOR DETERMINING THE OPERATING STATUS OF A MV SWITCHING DEVICE OF THE ELECTROMAGNETIC TYPE

    公开(公告)号:US20170250042A1

    公开(公告)日:2017-08-31

    申请号:US15512797

    申请日:2015-08-05

    Applicant: ABB Schweiz AG

    Abstract: A method for determining the operating status of a MV switching device (1), which comprises one or more electric poles, each comprising a movable contact and a fixed, contact adapted to be coupled or uncoupled during the switching operations of said switching device, and an electromagnetic actuator comprising a magnetic core, a test coil wound around said magnetic core and a movable plunger operatively coupled to the movable contact of each electric pole. The method comprises: providing a test signal (ST) to said test coil for an observation period of time (TO), said test signal having a waveform adapted to excite said magnetic core; obtaining measuring data (VM, IM) indicative of the voltage at the terminals of said test coil and of the current circulating along said test coil during said observation period of time; calculating observation data (RN, IM) indicative of the electric behaviour of said test coil at the end of said observation period of time on the base of said measuring data; selecting at least a transformation function (F1, F2) indicative of the electromagnetic behaviour of said electromagnetic actuator; and calculating first estimation data (P, T) indicative of the operating status of said electromagnetic actuator on the base of said observation data (RN, LN) by using said transformation function, said first estimation data comprising, a first estimation value (P) indicative of the position of the movable plunger of said electromagnetic actuator.

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