Switchgear

Patent metadata

Field	Value
Publication number	US-2016268076-A1
Application number	US-201415029464-A
Country	US
Kind code	A1
Filing date	Oct 2, 2014
Priority date	Nov 1, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

The invention provides a switchgear that is capable of increasing a degree of freedom of a position of a moving arcing contact in a circuit breaker, does not require dimension management of components and a mechanism for adjusting a position of the moving arcing contact, and is capable of simplifying fabrication of components and assembly of devices and reducing cost. The switchgear according to the invention includes: a circuit breaker that is configured of a fixed arcing contact installed at a fixed-side conductor and a moving arcing contact installed at a moving electrode that opens and closes with respect to the fixed arcing contact; a linear motor that generates drive force for operating the moving arcing contact; a position detecting device that detects a position of a moving element of the linear motor; a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact; and a control device that sets a moving range of the moving arcing contact by controlling a voltage and a phase to be supplied to the linear motor based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and position information of the moving element of the linear motor, which is detected by the position detecting device.

First claim

1 .- 14 . (canceled)

15 . A switchgear comprising: a circuit breaker that is configured of a fixed arcing contact installed at a fixed-side conductor and a moving arcing contact installed at a moving electrode that opens and closes with respect to the fixed arcing contact; a linear motor that generates drive force for operating the moving arcing contact; a position detecting device that detects a position of a moving element of the linear motor; a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact; and a control device that sets a moving range of the moving arcing contact by controlling a voltage and/or a phase to be supplied to the linear motor based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and position information of the moving element of the linear motor, which is detected by the position detecting device.

16 . A switchgear comprising: a circuit breaker that is configured of a fixed arcing contact installed at a fixed-side conductor and a moving arcing contact installed at a moving electrode that opens and closes with respect to the fixed arcing contact; a linear motor that generates drive force for operating the moving arcing contact; a position detecting device that detects a position of a moving element of the linear motor; a contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact; and a control device that changes a magnitude and/or a direction of thrust force acting on the moving element of the linear motor by controlling a voltage and/or a phase to be supplied to the linear motor and that sets a moving range of the moving arcing contact by controlling a drive speed and a stop position of the moving arcing contact based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and position information of the moving element of the linear motor, which is detected by the position detecting device.

17 . The switchgear according to claim 15 , wherein the moving range of the moving arcing contact is a wiped length that is a moving amount until the fixed arcing contact and the moving arcing contact open from a closing position and an opened position clearance that is remained displacement of the circuit breaker in a puffer chamber at an opening position between the fixed arcing contact and the moving arcing contact.

18 . The switchgear according to claim 17 , wherein the control device is configured of a control unit that controls the voltage and/or the phase to be supplied to the linear motor based on the contact state between the fixed arcing contact and the moving arcing contact, which is detected by the contact detecting device, and the position information of the moving element of the linear motor, which is detected by the position detecting device, and a drive circuit that receives a drive signal from the control unit and supplies the same voltage as that indicated by the drive signal to the linear motor.

19 . The switchgear according to claim 18 , wherein the control unit is configured of an ordinary-mode processing unit, a maintenance-mode processing unit, and a motor control unit, wherein the ordinary-mode processing unit has a function of determining a necessary operation for the circuit breaker based on an opening signal and a closing signal sent from an upper level and outputting a position command, a speed control value, and a q-axis current limit value to the motor control unit, wherein the maintenance-mode processing unit has a function of adjusting a command of closing an active position and a command of opening the active position so as to set the wiped length and the opened position clearance to be preset values based on a position signal of the moving element of the linear motor, which is obtained by the position detecting device, and a contact state signal between the fixed arcing contact and the moving arcing contact, which is obtained by the contact detecting device, and wherein the motor control unit has a function of obtaining a q-axis current command value in proportion to the thrust force of the linear motor calculated based on the position signal, the contact state signal, and an input signal from the maintenance-mode processing unit or the ordinary-mode processing unit, calculating a drive signal necessary for generating the q-axis current command value, and outputting the drive signal to the drive circuit.

20 . The switchgear according to any one of claim 15 , wherein the position detecting device that detects the position of the moving element of the linear motor is configured of a linear scale attached to the moving element and a sensor that reads a position of the linear scale.

21 . The switchgear according to any one of claim 15 , wherein the contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact has a test conductor attached to a moving-side conductor that supports the moving electrode, includes a first conduction measurement terminal provided at the test conductor and a second conduction measurement terminal provided on a side of an insulating spacer of the fixed-side conductor, and is configured of a conduction detecting device that detects timing at which the fixed arcing contact and the moving arcing contact are brought into contact with or separated from each other, based on currents from the first and second conduction measurement terminals.

22 . The switchgear according to any one of claim 15 , wherein the contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact includes a first conduction measurement terminal provided at a moving-side conductor that supports the moving electrode and a second conduction measurement terminal provided at the fixed-side conductor and is configured of a conduction detecting device that detects timing at which the fixed arcing contact and the moving arcing contact are brought into contact with or separated from each other, based on currents from the first and second conduction measurement terminals.

23 . The switchgear according to any one of claim 15 , wherein the contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact includes a conduction measurement terminal that is provided at a secondary current generation unit of a current transformer that is arranged in a periphery of a high-voltage conductor connected to a moving-side conductor that supports the moving electrode and forming a part of a main circuit and detects a current at the high-voltage conductor, and the contact detecting device is configured of a conduction detecting device that detects timing at which the fixed arcing contact and the moving arcing contact are brought into contact with or separated from each other, based on a current from the conduction measurement terminal.

24 . The switchgear according to any one of claim 15 , wherein the contact detecting device that detects a contact state between the fixed arcing contact and the moving arcing contact includes a first grounding switch that is connected to a high-voltage conductor connected to a moving-side conductor that supports the moving electrode and forming a part of a main circuit via a moving element so as to be able to freely open and close, a second grounding switch that is connected to a high-voltage conductor connected to the fixed-side conductor and forming a part of the main circuit via a moving element so as to be able to freely open and close, and a

Assignees

• Hitachi Ltd

Inventors

• Urasaki Hisashi
• Hirose Makoto
• Sasaki Masataka
• Oshita Yoichi
• Aoyama Yasuaki

Classifications

• H02P6/006

  Controlling linear motors · CPC title

• H02K41/02

  Linear motors; Sectional motors · CPC title

• H01H2003/268

  using a linear motor · CPC title

• H01H47/02

  for modifying the operation of the relay · CPC title

• H01H9/167

  Circuits for remote indication · CPC title