Contact point monitoring device for vacuum circuit breaker, and correction method performed through same
AssigneeLs Electric Co., Ltd.
InventorsHyun-Wook Lee, Ju-Hyun Kim
Life of this patent
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Abstract
The present disclosure relates to a contact point monitoring device for a vacuum circuit breaker, and a correction method performed through same, wherein deviations due to temperature in a sensor for monitoring the amount of wear at a contact point may be compensated for. According to the present disclosure, the amount of wear at the contact point may be accurately detected by correcting a characteristic value of a photosensor according to operation temperature, by taking into consideration the temperature characteristics of the photosensor.
Claims14
A contact monitoring device for a vacuum circuit breaker, wherein the vacuum circuit breaker includes a push rod assembly coupled to a movable electrode of a vacuum interrupter to raise or lower the movable electrode,
- wherein the contact monitoring device comprises:
- a discriminative sticker attached to an outer circumferential surface of the push rod assembly, extending along a moving direction of the push rod assembly, and composed of a plurality of areas whose reflectance vary step by step;
- a photosensor module including:
- a light-emitter facing toward the discriminative sticker and emitting light toward the discriminative sticker;
- a light-receiver facing toward the discriminative sticker and receiving light reflected from the discriminative sticker;
- and
- a circuit coupled to the light-emitter and the light-receiver, wherein the circuit processes a signal from the light-receiver and obtains an amount of current according to intensity of the reflected light, based on the processing result;
- and
- a data processing device communicating with the photosensor module, wherein the data processing device is configured to
- determine a movement amount of the push rod assembly from a withdrawn state to an inserted state of the movable electrode based on the amount of the current obtained by the photosensor module and to calculate a contact wear amount based on the movement amount;
- and
- in response to a state of the movable electrode remaining in the inserted state or the withdrawn state for a predefined period of time, applying a correction to the contact wear amount determined based on the movement amount, the correction based on:
- an open position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the photosensor module, when the vacuum circuit breaker has remained in the withdrawn state for the predefined period of time;
- or
- a closed position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the photosensor module, when the vacuum circuit breaker has remained in the inserted state for the predefined period of time.
A correction method of a contact monitoring device for a vacuum circuit breaker, wherein the device monitors a contact state using a voltage output value output from a photosensor, module to determine when to repair or replace the vacuum circuit breaker, wherein the method comprises:
- a step S200 of determining whether the contact state of the vacuum circuit breaker has changed;
- when the contact state of the vacuum circuit breaker has changed in the S200 step, a step S300 of determining whether the vacuum circuit breaker has changed to a contact inserted state;
- when the vacuum circuit breaker has changed to the contact inserted state in the S300 step, a step S400 of determining a position of a push rod assembly of the vacuum circuit breaker based on a voltage output value output from the photosensor module;
- when the position of the push rod assembly is determined in the S400 step, a step S500 of determining, based on a contact wear amount determination reference, whether the contact state is normal in the contact insertion, and whether a contact wear amount is smaller than or equal to a set value;
- and
- a step S600 of storing the determination result of the S500 step;
- when the contact state of the vacuum circuit breaker is not changed in the S200 step, a step S210 of determining whether a current time has reached the preset period;
- when the current time has reached the preset period in the S210 step, a step S310 of determining whether the vacuum circuit breaker is in a contact open state;
- when the vacuum circuit breaker is in the contact open state in the S310 step, a step 330 of measuring an open position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the photosensor module;
- when the vacuum circuit breaker is not in the contact open state in the S310 step, a step S350 of measuring a closed position of the push rod assembly of the vacuum circuit breaker based on the voltage output value output from the photosensor module;
- a step S370 of determining whether the contact wear amount determination reference correction of the photosensor module is required based on the open or closed position of the push rod assembly measured in the S330 or the S350 step, and correcting the contact wear amount determination reference;
- and
- replacing or repairing the vacuum circuit breaker.
Dependencies are inferred from the claim text.