Anomaly diagnosis device and anomaly diagnosis method for oil-hydraulic operating mechanism

Patent metadata

Field	Value
Publication number	US-11038339-B2
Application number	US-201716758303-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Nov 17, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

An anomaly diagnosis device diagnoses anomaly of an oil-hydraulic operating mechanism that controls opening and closing of a circuit breaker. The anomaly diagnosis device includes: a first counter, which is a counter that counts the number of times of a pressure-increasing operation started upon a decrease in a hydraulic pressure maintained in the oil-hydraulic operating mechanism to a first reference pressure, and stopped upon an increase in the hydraulic pressure to a second reference pressure; a timer that measures an operation interval that is a time period from when a pressure-increasing operation is stopped until a next pressure-increasing operation is started; and an anomaly determiner that corrects, based on the operation interval, the number of pressure-increasing operations obtained based on a result of counting by the counter, and determines presence or absence of an anomaly in the oil-hydraulic operating mechanism using the corrected data of the number of pressure-increasing operations.

First claim

The invention claimed is:

1. An anomaly diagnosis device for an oil-hydraulic operating mechanism, wherein the anomaly diagnosis device diagnoses, for anomaly, an oil-hydraulic operating mechanism that controls opening and closing of a circuit breaker, the anomaly diagnosis device comprising:
a counter to count a number of times of a pressure-increasing operation started upon a decrease in a hydraulic pressure maintained in the oil-hydraulic operating mechanism to a first reference pressure, and stopped upon an increase in the hydraulic pressure to a second reference pressure;
a timer to measure an operation interval that is a time period from when a pressure-increasing operation is stopped until a next pressure-increasing operation is started; and
an anomaly determiner to correct, based on the operation interval, a number of pressure-increasing operations obtained based on a result of counting by the counter, and determine presence or absence of an anomaly in the oil-hydraulic operating mechanism using data of the number of pressure-increasing operations that has been corrected.

2. The anomaly diagnosis device for an oil-hydraulic operating mechanism according to claim 1 , wherein the anomaly determiner obtains in advance a standard operation interval that is an interval of pressure-increasing operation under an ideal temperature condition, and divides the number of pressure-increasing operations by a ratio of the operation interval obtained by the timer to the standard operation interval to correct the number of pressure-increasing operations.

3. The anomaly diagnosis device for an oil-hydraulic operating mechanism according to claim 1 , wherein the anomaly determiner collects the data of the number of pressure-increasing operations that has been corrected, and evaluates a variation in the number of pressure-increasing operations based on distribution of the data to determine the presence or absence of the anomaly.

4. The anomaly diagnosis device for an oil-hydraulic operating mechanism according to claim 3 , wherein the anomaly determiner evaluates the variation in the number of pressure-increasing operations using a statistical testing technique.

5. The anomaly diagnosis device for an oil-hydraulic operating mechanism according to claim 1 , wherein the anomaly determiner corrects, based on the operation interval, the number of pressure-increasing operations obtained by subtraction of a number of pressure-increasing operations in association with operation of the circuit breaker from the result of counting by the counter.

6. The anomaly diagnosis device for an oil-hydraulic operating mechanism according to claim 5 , wherein the anomaly determiner subtracts a number of operations determined not to be associated with the pressure-increasing operation in the oil-hydraulic operating mechanism, from a number of operations of the circuit breaker to obtain the number of pressure-increasing operations in association with operation of the circuit breaker.

7. An anomaly diagnosis method for an oil-hydraulic operating mechanism, being an anomaly diagnosis method for diagnosing, for anomaly, an oil-hydraulic operating mechanism that controls opening and closing of a circuit breaker, the anomaly diagnosis method comprising:
counting a number of times of a pressure-increasing operation started upon a decrease in a hydraulic pressure maintained in the oil-hydraulic operating mechanism to a first reference pressure, and stopped upon an increase in the hydraulic pressure to a second reference pressure;
measuring an operation interval that is a time period from when a pressure-increasing operation is stopped until a next pressure-increasing operation is started;
correcting, based on the operation interval, a number of pressure-increasing operations obtained based on a result of the counting; and
determining presence or absence of an anomaly in the oil-hydraulic operating mechanism using data of the number of pressure-increasing operations that has been corrected.

Assignees

• Mitsubishi Electric Corp

Inventors

• Matsumoto Daigo

Classifications

• H01H33/34 Primary

  hydraulic · CPC title

• H02H1/0007

  concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445) · CPC title

• H01H2033/306

  monitoring the pressure of the working fluid, e.g. for protection measures · CPC title

• H02H5/08 Primary

  responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays · CPC title

• F15B15/20

  Other details {, e.g. assembly with regulating devices} · CPC title