ABNORMALITY DETECTING METHOD OF VACUUM VALVE FOR CHANGEOVER CIRCUIT BREAKER FOR LOAD-TIME TAP SWITCHING DEVICE

Japanese Patent JP2015192054

A

PROBLEM TO BE SOLVED: To provide a method for detecting the presence/absence of abnormality in a vacuum valve forming a changeover circuit breaker with high accuracy without stopping operation of a load-time tap switching device.SOLUTION: A rotary encoder RE is mounted, via an Oldham joint 701 and an insulation shaft 702, to a drive shaft 4 of a cam mechanism 201 that turns on and turns off a first vacuum valve and a second vacuum valve forming the changeover circuit breaker in a predetermined sequence. An operational angular velocity in turning on the vacuum valves of three phases is detected from output of the encoder. If there is a difference equal to or more than a setting between a rotational speed in turning off the first vacuum valve of three phases and a rotational speed in turning off the second valve of three phases, it is detected that there is abnormality in the vacuum valve with the higher rotational speed in turning-off operation between the first and second vacuum valves of three phases.

JPS63106022	THYRISTOR CONTROL TYPE VOLTAGE PHASE REGULATOR
JP4289514	Voltage regulator
JP2022079254	TAP SWITCHER AT LOAD

TSUJIMOTO KOHEI

JP2014068635A

November 02, 2015

March 28, 2014

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DAIHEN CORP

H01F29/04; H01F29/02

JP2010080590A	2010-04-08
JPH11283849A	1999-10-15
JP2000340435A	2000-12-08
JPH0795723A	1995-04-07
JP2008091393A	2008-04-17
JP2004119928A	2004-04-15
JPH0837117A	1996-02-06

Shinichi Kikuchi
Toru Kikuchi
Hidetoshi Matsumoto

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