KR20130124826A - Apparatus and methof for diagnosing performance characteristics of a circuit breaker in a state of live wire - Google Patents

Abstract

The purpose of the present invention is to provide a device and a method for diagnosing the operating characteristics of a circuit breaker capable of diagnosing a closed coil and/or the resistance and/or inductance of a trip coil. According to one preferred embodiment of the present invention, the diagnostic device comprises an event detection module which detects whether or not an event occurs in a coil on a control circuit; and a diagnostic module which applies a diagnosis voltage to a diagnosed coil by corresponding to the detection where there is no event in the coil by the event detection coil and which diagnosis at least one among the resistance and inductance of the diagnosed coil using the applied diagnosis voltage and current on the diagnosed coil. [Reference numerals] (10) Relay;(1000) Diagnostic device;(AA) Tripping signal

Description

Apparatus and method for diagnosing breaker operation characteristics in a live state {APPARATUS AND METHOF FOR DIAGNOSING PERFORMANCE CHARACTERISTICS OF A CIRCUIT BREAKER IN A STATE OF LIVE WIRE}

The present invention relates to an apparatus and method for diagnosing circuit breaker operation characteristics, and more particularly, to constantly monitor the resistance and / or inductance of a trip coil and / or a close coil installed in a breaker in a live state. The present invention relates to an apparatus and a method for continuously diagnosing breaker operating characteristics.

The breaker is installed in the power system to quickly disconnect the fault section from the system in the event of a fault in the power system and return the separated section to the system in the event of a system return.

The breaker is provided with a fixed electrode and a movable electrode therein, the closing electrode and the movable electrode are short-circuited during closing, and the movable electrode is separated from the fixed electrode during tripping.

There are various ways of moving the movable electrode of the circuit breaker, and mainly a solenoid method and a spring charging method are used.

The solenoid method is a method of positioning the movable electrode inside the solenoid and moving the movable electrode by the solenoid magnetic force. The spring charging method is a method of moving the movable electrode by the restoring force (elastic force) of the charged spring.

The spring charging method may include a first mechanism for performing an injection or trip operation with the resilience of the largely charged spring, a second mechanism for maintaining the charging state of the spring, and a control circuit for releasing the charging state for the closing or tripping. .

Here, the control circuit can be largely divided into two elements. Firstly, there is an input circuit which causes the first mechanism to perform the closing operation by the restoring force of the charged spring by moving the mover in accordance with the close signal to cause the second mechanism to release the spring from maintaining the charging state. Secondly, there is a trip circuit which causes the first mechanism to perform the trip operation by the restoring force of the charged spring by moving the mover in response to the trip signal to cause the second mechanism to release the spring from maintaining the charging state.

The first mechanism and the second mechanism described above may have different structures for each breaker developer, and the present invention does not limit the first mechanism and the second mechanism in the spring charging method. That is, if it is to perform the closing or trip operation by the restoring force of the charged spring, it may belong to the breaker of the present invention.

1 and 2, a general control circuit mounted on a breaker will be described.

1 shows a schematic diagram of a general control circuit mounted in a breaker. 2 shows the current profile on the coil upon breaking or tripping.

First, referring to FIG. 1, the control circuit 20 may include a close line L1 and a trip line L2 to which power supplies VDD are connected at both ends. The close coil 21 and the close switch 22 may be disposed in series on the close line L1. In addition, a trip coil 23 and a trip switch 24 may be arranged in series on the trip line L2.

The close switch 22 may remain on only when the close signal is applied from the relay 10. When the close switch 22 is on, the close coil 21 may be excited by the power supply VDD, and the mover (not shown) may move by the suction force of the closed close coil 21. By the movement of the mover, as described above, the breaker can perform the closing operation.

The trip switch 24 may maintain the ON state only when the trip signal is applied from the relay 10. When the trip switch 24 is in the on state, the trip coil 23 may be excited by the power supply VDD, and the mover (not shown) may move by the suction force of the excited trip coil 23. By the movement of the mover, as described above, the breaker can perform the trip operation.

Such a closed coil 21 or trip coil 23 may generally have a current profile as shown in FIG. 2 during a closing or trip operation. First, when the power supply VDD is applied to the coil by turning on the switches 22 and 24, the current magnitude of the coils 21 and 23 rises. Then, when the mover starts to move, the permeability of the closing or closing coil is varied, whereby the current magnitude can be reduced. Then, the steady state may be reached after the current magnitude increases again. When the mover moves a predetermined distance, the charging state of the spring may be released. When the relay 10 stops applying the close signal or the trip signal, the current magnitude on the coils 21 and 23 may reach “0” after a predetermined time has elapsed. The time at which the current magnitude reaches "0" is different, but generally, it is predetermined until the magnitude of current reaches "0" by the characteristics of the switches 22 and 24 or the energy charged in the coils 21 and 23. It takes time. Here, the relay 10 may stop the application of the close signal or the trip signal based on the system state or preset information.

When controlling the breaker using such a closed coil and a trip coil, the closing speed or the trip speed of the breaker may depend on the moving speed of the mover. And, the moving speed of the mover may depend on the magnitude of the current on the closed coil or trip coil when the power is applied. That is, the moving speed of the mover may be influenced by the resistance of the close coil or the trip coil. Also, the closing speed or tripping speed of the breaker may depend on the inductance of the coil. This is because when the inductance of the close coil or the trip coil (or the number of turns of the trip coil) changes, the absorption force of the close coil or the trip coil changes.

Degradation or other factors in the operation of the breaker may change the resistance or inductance of the coil, thereby changing the closing or tripping speed of the breaker. In particular, when the trip speed exceeds a predetermined time, the ripple effect of the system accident can be very large.

Therefore, it is necessary to monitor the closing or closing performance of the breaker by always diagnosing the resistance or inductance of the coil during the breaker operation. And in order to provide a clearer indicator in the diagnosis of its performance, it is necessary to diagnose the resistance or inductance of the coil itself. In addition, for constant diagnosis, the diagnosis needs to be made in a live state. In addition, it is necessary to diagnose the coil as long as it does not interfere with the closing and tripping of the breaker.

In addition, it is necessary to diagnose a coil corresponding to the event at the end of the event during breaker operation.

To date, no technology has been able to meet any of these needs.

Accordingly, an object of the present invention is to provide an apparatus and method for diagnosing breaker operating characteristics capable of always diagnosing resistance and / or inductance of a closed coil and / or a trip coil.

It is another object of the present invention to provide an apparatus and method for diagnosing circuit breaker operating characteristics capable of diagnosing resistance and / or inductance of a closed coil and / or trip coil in a live state.

The present invention also provides an apparatus and method for diagnosing circuit breaker operating characteristics capable of diagnosing resistance and / or inductance of the closed coil and / or trip coil within a range that does not interfere with the closing and / or tripping operation of the circuit breaker. The purpose.

In addition, an object of the present invention is to provide an apparatus and method for diagnosing a breaker operating characteristic capable of diagnosing a coil corresponding to the event at the end of an event during breaker operation.

Other objects of the present invention will be readily understood through the following description of the embodiments.

Diagnosis apparatus according to an aspect of the present invention for achieving the above object is an event sensing module for detecting whether an event occurs in the coil on the control circuit; And in response to the event sensing module detecting that there is no event for the coil, applying a diagnostic voltage to the coil to be diagnosed, and using the applied diagnostic voltage and the current on the coil to be diagnosed, the resistance and inductance of the coil to be diagnosed. It includes a diagnostic module for diagnosing at least one of.

Here, when the preset time elapses, the diagnosis module may further include a synchronization module for controlling the diagnosis module to start diagnosis.

In addition, the diagnostic module may be electrically separated from the diagnosis coil in a time when the diagnosis coil is not diagnosed.

The synchronization module may control the diagnosis module to stop the diagnosis when the event detection module detects that an event occurs in the coil on the control circuit during diagnosis of the diagnosis target coil.

The diagnostic module may include a diagnostic voltage supply unit connected to the diagnosis target coil through a power supply line provided with a switch to apply the diagnosis voltage to the diagnosis target coil, and the switch may include the diagnosis target by a control signal. It can be turned on only when the coil is diagnosed.

The switch may also be turned off in response to the event sensing module detecting that an event has occurred in a coil on the control circuit during diagnostics.

In addition, the input impedance of the event sensing module seen in at least one of the close line and the trip line in which the diagnosis target coil is installed may be greater than or equal to a threshold value.

In addition, the event sensing module may include a comparator for outputting different voltages according to the presence of an event on a coil on the control circuit.

The event sensing module is further configured to determine whether an event has occurred in the coil on the control circuit using at least one of a change in voltage on a line on which the coil on the control circuit is installed, a change in current on the coil on the control circuit, and a presence of an event signal. Can detect whether or not.

In addition, the event detection module detects the current on the coil on the control circuit using a current transformer (CT) and if it is determined that the current on the coil on the control circuit exceeds a preset value, the event on the coil on the control circuit is determined. Can be detected as occurring.

에 의해, 상기 진단 대상 코일의 저항을 산출할 수 있다.In addition, the diagnostic module applies a DC voltage to the diagnosis target coil,

By this, the resistance of the diagnosis target coil can be calculated.

In addition, the diagnostic module applies an AC voltage having one frequency to the diagnosis coil, and uses the phase difference between the voltage applied to the diagnosis coil and the current on the diagnosis coil, thereby providing a resistance and At least one of the inductances may be calculated.

The diagnostic module may apply an AC voltage having a first frequency and an AC voltage having a second frequency to the diagnosis coil, and apply the first impedance and the second frequency of the diagnosis coil to the first frequency. By calculating the second impedance of the coil to be diagnosed with respect to each other, and by calculating the first impedance and the second impedance, at least one of the resistance and the inductance of the coil to be diagnosed can be calculated.

In addition, the diagnosis coil may be installed in a series or parallel structure on at least one of a close line and a trip line.

According to another aspect of the present invention, there is provided a method of diagnosing a breaker operation characteristic, the event sensing module determining whether an event occurs in a coil on a control circuit; And if it is determined that no event occurs in the coil on the control circuit, the diagnostic module applies a diagnostic voltage to the coil to be diagnosed, and uses the applied diagnostic voltage and a current on the coil to be diagnosed to resistance of the coil to be diagnosed. And diagnosing at least one of the inductances.

Here, the event detection module determines whether an event occurs in the coil on the control circuit during the diagnosis of the diagnosis target coil; And if it is determined that an event occurs in the coil on the control circuit during the diagnosis of the diagnosis target coil, the diagnosis module may further include stopping the diagnosis.

If it is determined that an event occurs in the coil on the control circuit during the diagnosis of the diagnosis target coil, the diagnosis module may be electrically disconnected from the diagnosis target coil.

As described above, the present invention can always diagnose the resistance and / or inductance of the close coil and / or the trip coil every predetermined time.

In the present invention, the coil is electrically disconnected from the coil to be diagnosed at a time when the diagnosis module does not diagnose the coil to be diagnosed, so that the coil can be always diagnosed without affecting the operation characteristics of the circuit breaker.

In addition, according to the present invention, when the event detection module detects that an event has occurred in the diagnosis target coil during diagnosis of the diagnosis target coil, by controlling the diagnosis module to stop the diagnosis, the breaker operating characteristic may not be changed at all by the diagnosis. have. Thereby, misdiagnosis of the coil may be prevented.

In addition, the present invention can prevent the breaker operation characteristic from being changed by the diagnostic apparatus by making the input impedance of the event sensing module infinite in at least one of a closed line and a trip line provided with a diagnosis target coil.

In addition, the present invention can always diagnose the resistance and / or inductance of the coil in a variety of ways using a DC voltage or an alternating voltage.

In addition, the present invention can diagnose the coil to be diagnosed every time an event occurs in the circuit breaker. Thereby, at the time of abnormality of a circuit breaker operation characteristic, it can be diagnosed whether the abnormality is due to a diagnosis object coil.

1 shows a schematic diagram of a general control circuit mounted in a breaker.
2 shows the current profile on the coil upon breaking or tripping.
Figure 3 shows a schematic diagram of a state in which the diagnostic device according to an embodiment of the present invention is installed in the breaker.
4 shows a functional block diagram of the diagnostic device of FIG. 3.
FIG. 5 shows a schematic diagram of a preferred embodiment of the event sensing module of FIG. 4.
FIG. 6 is a diagram for describing a method of installing the diagnostic device of FIG. 3.
7 shows a schematic diagram of another embodiment of the event sensing module of FIG. 4.
8 shows a schematic diagram of the diagnostic module of FIG. 3.
9 is a schematic diagram of a state in which a diagnostic apparatus according to another embodiment of the present invention is installed in a breaker.
10 shows a functional block diagram of the diagnostic device of FIG. 9.
FIG. 11 shows a schematic diagram of a preferred embodiment of the event sensing module of FIG. 10.
12 shows a schematic diagram of another embodiment of the event sensing module of FIG. 10.
FIG. 13 shows a schematic diagram of another embodiment of the event sensing module of FIG. 10.
14 is a schematic view of a state in which a diagnostic apparatus according to another embodiment of the present invention is installed in a breaker.
15 is a schematic view of a state in which a diagnostic apparatus according to another embodiment of the present invention is installed in a breaker.
16 is a flowchart illustrating a circuit breaker diagnosis method according to an exemplary embodiment of the present invention.
17 is a functional block diagram of a diagnostic apparatus according to another embodiment of the present invention.
18 is a flowchart illustrating a circuit breaker diagnosis method according to another exemplary embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be.

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, a circuit breaker operating characteristic diagnosis apparatus (hereinafter, referred to as a “diagnostic apparatus”) according to an exemplary embodiment of the present invention will be described with reference to FIGS. 3 to 8.

Figure 3 shows a schematic diagram of a state in which the diagnostic device according to an embodiment of the present invention is installed in the breaker. 4 shows a functional block diagram of the diagnostic device of FIG. 3. FIG. 5 shows a schematic diagram of a preferred embodiment of the event sensing module of FIG. 4. FIG. 6 is a diagram for describing a method of installing the diagnostic device of FIG. 3. 7 shows a schematic diagram of another embodiment of the event sensing module of FIG. 4. 8 shows a schematic diagram of the diagnostic module of FIG. 3. In order to clarify the gist of the present invention, the description overlapping with the above description will be omitted or simplified.

Hereinafter, for convenience of description, the diagnosis apparatus 1000 will be described based on diagnosing the trip coil 23. The matters described below may also be applied when the diagnosis apparatus 1000 diagnoses the closed coil.

Referring to FIG. 3, the diagnosis apparatus 1000 may be installed in series with a trip coil 23 that is a diagnosis target. That is, the diagnostic apparatus 1000 may be installed such that the trip line L1 passes through the diagnostic apparatus 1000. The diagnostic apparatus 1000 may be installed between the trip switch 24 and the trip coil 23. 3 is only an example, and the diagnostic apparatus 1000 may be installed between the positive electrode (+ pole) of the power supply VDD and the trip switch 24. Alternatively, the diagnostic apparatus 1000 may be installed between the trip coil 23 and the negative electrode (-pole) of the power supply. When the diagnosis target is the closed coil 21, the diagnostic apparatus 1000 may be installed in series with the closed coil 21 in the above manner.

Referring to FIG. 4, the diagnostic apparatus 1000 includes an event detection module 1100, a synchronization module 1200, a diagnostic module 1300, a storage module 1400, an interface module 1500, and a notification module 1600. can do.

Referring to FIG. 5, the event sensing module 1100 may detect a trip event (or an input event) on the trip line L2 or the closed line L1. Hereinafter, “event sensing module 1100 detects an event” may include “event sensing module 1100 detects at least one of absence, occurrence, duration, and termination of an event”. The event sensing module 1100 may use at least one of a trip signal (or a close signal), a current on the trip line (or a close line), and a voltage on the trip coil (or a close coil) for event detection. .

The event detection module 1100 may be configured such that the input impedance seen from the trip line L2 or the close line L1 on which the diagnosis target coil is installed is infinite, and preferably does not affect the threshold value (operation characteristics of the diagnosis target coil). The set input impedance value, which can be variably set by the circuit breaker operator or the designer of the diagnostic device). As a result, the event detection module 1100 is connected to the trip line L2 or the closed line L1 to detect a trip event (or a closing event) while the event detecting module 1100 detects a trip event (or a closing event). Even when events and closing events are collectively referred to as "events", they may not affect the current on the trip coil. That is, the breaker operating characteristic may not be affected by the event sensing module 1100 connected to the trip line L2 or the close line L1. Alternatively, a switch (not shown) may be provided at an input of the event detection module 1100. In addition, the switch may be turned on only at the time of diagnosis by the synchronization signal of the synchronization module 1200. As a result, even when the event detection module 1100 is connected to the breaker control circuit 20, the operation characteristics of the breaker may not be affected at all.

The event sensing module 1100 may include a comparator 1110, and an input terminal of the comparator 1110 may be connected to a trip line L2 or a closed line L1. As a result, the comparator 1110 outputs a HIGH signal when the power supply VDD is applied to the trip coil 23 or the close coil 21 when a trip event (or an input event) occurs or continues. In such a manner, the event detection module 1100 may detect an event. Here, the comparator 1110 may output a LOW signal when an event does not occur or when it ends. The input of the comparator may be connected to a predetermined point on the trip coil, preferably to the input of the trip coil, and vary in output depending on the voltage change on the trip coil. The event detection module 1100 may determine that a trip event (or a close event) has occurred when the power supply VDD is applied to the trip coil 23 or the close coil 21. When the application of the power supply VDD to the trip coil 21 or the close coil 21 is terminated, the event detection module 1100 may determine that the trip event (or the close event) has ended. Alternatively, the event detection module 1100 may generate a trip event (or a close event) when a preset time expires from when the power supply VDD is applied to the trip coil 21 or the close coil 21. It can be judged as finished. 5 is merely an example, and a buffer may be installed at an input side of the comparator 1110, or an inverter may be installed at an output terminal of the comparator 1110. That is, if the structure is connected to the trip line L2 or the closed line L1 and senses an event using a voltage change at any point on the trip line L2 or the closed line L1, It may belong to the event detection module 1100 of the present invention.

Referring to FIG. 6, some sections of the trip line L2 may be provided inside the diagnostic apparatus 1000 and may be connected to each other through a first pin P1 and a second pin P2 that are shorted to each other. The input terminal of the comparator 1110 may be connected to the first pin P1 or the second pin P2 or another pin connected to the first pin P1 or the second pin P2. By such a wiring structure, it is easy to install the diagnostic apparatus, and as the number of diagnostic apparatus components decreases, the probability of failure can be reduced and reliability can be improved.

Unlike the above, the event detection module 1100 may detect an event using a current change on the trip line L2 or the close line L1. As shown in FIG. 2, the current on the trip line L2 or the close line L1 may change when an event occurs. Accordingly, the event detection module 1100 monitors the current on the trip line L2 or the close line L1 and determines that the current on the trip line L2 or the close line L1 is greater than or equal to a preset value. It can be determined that the event occurs or is ongoing. If it is determined that the current on the trip line L2 or the close line L1 is less than the preset value, the event sensing module 1100 may determine that the event is absent or the end of the event. The event sensing module 1100 may monitor a current on the trip line L1 or the close line L1 using a comparator having a preset reference voltage. The event sensing module 1100 may determine that an event has occurred when the current on the trip line L2 or the close line L1 changes to a predetermined value or more. The event sensing module 1100 may determine that the event is terminated when the current on the trip line L2 or the close line L1 changes from more than a predetermined value to less than a predetermined value. Alternatively, the event detection module 1100 may determine that the event has ended when the preset time is exceeded from when the current on the trip line L2 or the close line L1 changes from above to below the preset value. Can be. To this end, the event detection module 1100 detects a current on the trip line L2 or the closed line L1 using a CT (Current Transformer) or a shunt (not shown), and detects the current. Current can be used to detect whether an event has occurred.

Alternatively, the event detection module 1100 may detect whether a trip event (or an input event) occurs using a trip signal (or a close signal). To this end, the event detection module 1100 is connected to a trip signal line (or a closed signal line) as shown in FIG. 7, and the trip signal (or a close signal) is connected to the trip switch 24 or the close switch 22. It may be recognized that a trip event (or an input event) is occurring or persistent when applied to. When the application of the trip signal (or the close signal) to the trip switch 24 or the close switch 22 is terminated, the event detection module 1100 may determine that the trip event (or the close event) has ended. Can be. Alternatively, the event detection module 1100 may generate a trip event (or close) when a preset time elapses from when the application of the trip signal (or the close signal) to the trip switch 24 or the close switch 22 is terminated. Event) can be determined to have ended. The event detection module 1100 may generate a trip event (or a close event) when a preset time has elapsed since the trip signal (or the close signal) is applied to the trip switch 24 or the close switch 22. It can be determined that it is finished. In this case, the relay may be set to end the application of the trip signal (or the close signal) after a predetermined time elapses from the time when the trip signal (or the close signal) is applied.

Unlike the above, the event detection module 1100 may be controlled by a signal from an auxiliary contact (not shown) synchronized with a trip event or an input event, a sensor (not shown) that detects an operation of a mechanism for performing a trip or shutdown operation. Trip events or closing events can be detected. Alternatively, the combination may be implemented in the above manner. For example, it may be configured to determine that the trip event has occurred only when both the trip signal and the voltage on the trip line are recognized as the trip event. In this case, an AND gate having one input connected to the trip signal and one input connected to the trip line may be used.

That is, the present invention does not limit the event detection structure and method of the event detection module 1100.

The event sensing module 1100 may output a preset signal to the synchronization module 1200 in response to detecting the event.

4, the synchronization module 1200 may control the diagnostic module 1300 such that the diagnosis module 1300 starts a diagnosis when a preset time elapses. To this end, the synchronization module 1200 may include a timer. In addition, the synchronization module 1200 may control the diagnosis module 1300 to allow the diagnosis module 1300 to start diagnosis only when the occurrence or continuation of an event is not detected by the event detection module 1100. have. In addition, the synchronization module 1200 may generate an event on the trip coil 23 or the close coil 21 of which the event detection module 1100 is diagnosed during the diagnosis of the trip coil 23 or the close coil 21 that is a diagnosis target. If it is detected that the error has occurred, the diagnostic module 1300 may control the diagnostic module 1300 to stop the diagnosis. In this case, the diagnosis module 1300 may start diagnosis again at a next diagnosis cycle. When the power source VDD is applied to the diagnosis target coil, another closed circuit may be connected to a closed circuit formed by the diagnosis target coil and the diagnosis apparatus. In this case, if the diagnosis is continued, the impedance of the coil to be diagnosed cannot be diagnosed. In addition, if the diagnosis is continued, the exciting speed of the coil to be diagnosed may be changed by the current component flowing to the diagnostic device. Therefore, when an event occurs during diagnosis, it is preferable that the diagnosis device is electrically disconnected from the coil to be diagnosed by the control of the synchronization unit and the diagnosis is stopped. Alternatively, when an event occurs during the diagnosis, the synchronization unit 1200 may control the diagnosis module 1300 to stop the diagnosis regardless of the type of the event. The synchronization module 1200 may be configured to diagnose a trip coil (or a closed coil) according to a preset period. The period can be arbitrarily selected by the designer of the diagnostic device. When the trip coil and the close coil are periodically diagnosed, the trip coil and the close coil may be diagnosed alternately. The present invention does not limit the diagnosis order and cycle of the trip coil and the close coil, and may belong to the present invention if the trip coil and / or the close coil are diagnosed according to a preset order and time.

Referring to FIG. 8, the diagnostic module 1300 may include a diagnostic voltage applying unit 1310, a current detector 1320, and an impedance diagnosis unit 1330. The diagnostic module 1300 may be synchronized by the synchronization unit 1200 to perform a diagnostic operation. The diagnosis module 1300 may be in a standby mode (idle mode or sleep mode) when not diagnosed, and may be synchronized with the synchronization unit 1200 to operate in an active mode. As a result, power consumed by the diagnostic apparatus 1000 may be minimized.

The diagnostic voltage applying unit 1310 may include a power supply unit 1311. The power supply unit 1311 may apply a diagnostic voltage used in the diagnosis to the trip coil 21 or the close coil 23. The diagnostic voltage may be a direct current voltage or an alternating voltage having at least one frequency. That is, the power supply unit 1311 may output two or more AC voltages having different frequencies. To this end, the power supply unit 1311 may include an inverter for controlling the frequency of the voltage. It is preferable that the peak value of the diagnostic voltage and the cycle in which the diagnostic voltage is applied are adjusted so as not to move the mover inside the trip coil (or the close coil) to be diagnosed. The magnitude of the diagnostic voltage is preferably less than the threshold voltage at which the mover initiates movement so that the coil is excited by the diagnostic voltage and the mover does not move. The application time of the diagnostic voltage is preferably less than the threshold time at which the mover starts moving. The threshold voltage and the threshold time may be arbitrarily set by the breaker designer or operator, or the designer or operator of the diagnostic device. The diagnostic voltage may be generated by converting power on the power system, or alternatively, may be generated by using a separate power source independent of the power system.

The power supply unit 1311 may be connected to both ends of the trip coil 23 and the close coil 21 to be diagnosed through the power supply lines L3 and L4 provided with the switch 1312. Here, the switch 1312 may be turned on only when diagnosed by the control signal. Further, even in the case of diagnosis, the diagnosis object may be turned off when an event occurs in the coil (a trip event when the trip coil is a diagnosis target coil or a closing event when the diagnosis target coil is a closed coil). Here, the control signal may be output from the synchronizer 1320. The synchronizer 1320 may turn on the switch 1312 by outputting a control signal when a preset time elapses. When the diagnosis target generates an event (a trip event if the trip coil is a diagnosis target coil or a closing event if the diagnosis target coil is a closed coil) during the diagnosis, a control signal may be output to turn off the switch 1312. In contrast, if an event occurs during diagnosis regardless of the coil to be diagnosed, the synchronizer 1200 may uniformly turn off the switch 1312. When the diagnosis is completed, the switch 1312 may be turned off by the control signal. As a result, the diagnosis module 1300 may be electrically separated from the diagnosis object coil at a time when the diagnosis object coil is not diagnosed. As a result, the impedance of the closed line or the trip line may not change by the diagnosis apparatus 1000 at the input / trip event. That is, malfunction of the circuit breaker may not occur due to the installation operation of the diagnostic apparatus 1000. Here, when the synchronization module 1200 outputs a control signal to the diagnostic module 1300, a structure in which the diagnostic voltage applying unit 1310 controls the switch 1312 may be used. Alternatively, the switch 1312 may perform an on / off operation by a control signal from the event sensing module 1100.

The current detector 1320 may detect a current on the trip coil 23 or the close coil 21 caused by the diagnostic voltage. At this time, the current can be detected using CT or shunt resistor.

The impedance diagnosis unit 1330 may diagnose an impedance using a diagnosis voltage and a current on the trip coil 23 or the close coil 21.

[When using a DC voltage as the diagnostic voltage]

The diagnostic voltage applying unit 1310 may apply a DC voltage as the diagnostic voltage. The impedance diagnosis unit 1330 may calculate the resistance of the trip coil 23 or the close coil 21 by the following equation (1).

If you want to diagnose only the resistance of the coil, the above method can be adopted. In this case, the diagnostic device can be implemented as a very simple system.

[When 1 sinusoidal wave is used as the diagnostic voltage]

The diagnostic voltage applying unit 1310 may apply a diagnostic voltage having an angular frequency ω to the trip coil 23 or the close coil 21. In this case, the impedance diagnosis unit 1330 may calculate a phase difference between the diagnostic voltage and the current on the trip coil 23 or the close coil 21. The phase difference may be calculated by a known method. For example, the phase difference θ can be calculated by calculating the phase difference between the diagnostic voltage and the peak of the current on the trip coil 23 (or the close coil 21). The impedance diagnosis unit 1330 may calculate the resistance of the trip coil 23 (or the close coil 21) by Equation 2 below.

In addition, by the following equation (3), the impedance diagnosis unit 1330 can calculate the inductance of the trip coil 23 or the close coil 21.

In addition to Equations 2 and 3, in order to calculate the resistance or inductance of the trip coil 23 or the close coil 21, the impedance diagnosis unit 1330 may use various known mathematical algorithms.

[When two sine waves are used as the diagnostic voltage]

The diagnostic voltage applying unit 1310 may apply two sinusoidal waves having angular frequencies ω1 and ω2 to the trip coil 23 or the close coil 21, respectively. In this case, the impedance diagnosis unit 1330 may calculate impedances for the angular frequencies ω1 and ω2 by the following equations (4) and (5).

Here, Equations 4 and 5 may be converted into Equations 6 and 7, respectively.

The impedance diagnosis unit 1330 may combine Equations 6 and 7 to calculate the resistance R and / or inductance L of the trip coil 23 or the close coil 21.

Equations 1 to 7 are merely examples, and the resistance and / or inductance of the trip coil 23 or the close coil 21 may be calculated by applying various known mathematical algorithms according to the applied diagnostic voltage. Can be.

The impedance diagnosis unit 1330 may determine whether the calculated resistance and / or inductance are within a normal range. If it is determined that the impedance is not within the normal range, the impedance diagnosis unit 1330 may notify the outside of the trip coil 23 or the closed coil 21 impedance through the notification module 1600. The impedance diagnosis unit 1330 may store diagnosis related information such as a diagnosis target (close coil and / or trip coil), a measured impedance, and a diagnosis result (normal or abnormal) in the storage unit 1400 in order of diagnosis time. In addition, the impedance diagnosis unit 1330 may map an identifier for identifying a diagnosis target (a trip coil or a closed coil) to the diagnostic related information in the storage module 1400. Alternatively, the impedance diagnosis unit 1330 may transmit the diagnostic related information to the higher node through the notification module 1600.

4, the storage unit 1400 may store overall control of the diagnostic apparatus 1000, algorithms and variables used for diagnosis, and diagnostic related information.

The interface module 1500 may include an input unit for inputting a user, an output unit for exchanging data with an external device, a monitor unit for outputting data, and the like.

The notification module 1600 may notify the outside of the diagnosis result of the impedance. Alternatively, the notification module 1600 may include a communication module to transmit a diagnosis result to the outside according to a specific protocol.

Each module in the diagnostic apparatus 1000 of FIG. 3 may be mounted in a single device or in a different device. In addition, the diagnostic apparatus 1000 may be manufactured in the form of a device for diagnosing at least one of the close coil 21 and the trip coil 23. Also, each element of the diagnosis apparatus 1000 may be divided into an element for diagnosing only the closed coil 21 and an element for diagnosing only the trip coil 23. In this case, some elements in the diagnostic apparatus 1000 may be shared.

Hereinafter, a diagnostic apparatus according to another exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 13.

9 is a schematic diagram of a state in which a diagnostic apparatus according to another embodiment of the present invention is installed in a breaker. 10 shows a functional block diagram of the diagnostic device of FIG. 9. FIG. 11 shows a schematic diagram of a preferred embodiment of the event sensing module of FIG. 10. 12 shows a schematic diagram of another embodiment of the event sensing module of FIG. 10. FIG. 13 shows a schematic diagram of another embodiment of the event sensing module of FIG. 10. The description of the foregoing is omitted or simplified. In addition, it demonstrates centering around difference with the above diagnostic apparatus.

Referring to FIG. 9, the diagnostic apparatus 2000 may be installed in a series structure on the close line L1 and the trip line L2, and diagnose the close coil 21 and the trip coil 23 at predetermined intervals. .

Referring to FIG. 10, the diagnostic apparatus 2000 includes an event detection module 2100, a synchronization module 2200, a diagnostic module 2300, a storage module 2400, an interface module 2500, and a notification module 2600. can do.

Referring to FIG. 11, the event detection module 2100 may include a first event detector 2110 for detecting an input event and a second event detector 2120 for detecting a trip event. In addition, each of the first event detector 2110 and the second event detector 2120 may detect an input event or a trip event as described above. For example, as shown in FIG. 11, the first event detector 2110 may determine whether there is an input event using a voltage change on the closed line L1 detected by a comparator connected to the closed line L1. have. The second event detector 2120 may determine whether there is a trip event using a voltage change on the input line L2 detected by the comparator connected to the trip line L2.

Alternatively, the event sensing module 2100 may be manufactured to share one comparator. As shown in FIG. 12, a switch unit 2130 is provided at the comparator input terminal, and the switch unit 2130 may perform a switching operation by a control signal of the synchronizer 2200. The comparator may be connected to the close line L1 by the switch unit 2130 at the time of diagnosing the close coil 21. The comparator may be connected to the trip line L2 by the switch unit 2130 at the time of diagnosing the trip coil 23.

Alternatively, as shown in FIG. 13, the event detection module 2100 may detect an input event and a trip event using the close signal and the trip signal. In this case, the event detection module 2100 may include a third event detector 2140 for detecting an input event using a comparator and a fourth event detector 2150 for detecting a trip event using a comparator. Unlike the above, as described above, the current on the close line L1 or the trip line L2 may be used to detect the close event or the trip event.

11 to 13 are merely examples and may be closed or trip events using at least one of the close signal and the trip signal, a current on at least one of the close line and the trip line, or a voltage on at least one of the close coil and the trip coil. If it detects it may belong to the present invention. And, a method of detecting a close event or a trip event using a current on at least one of the close signal and the trip signal, at least one of the close line and the trip line, or a voltage on at least one of the close coil and the trip coil may be used interchangeably. Can be. For example, an input event may be detected using a close signal and a trip event may be detected using a voltage change on the trip coil. Alternatively, the close event may be detected using a change in current on the close coil, and the trip event may be detected using a change in voltage on the trip coil.

As described above, the event detection module 2100 may include a signal from an auxiliary contact (not shown) synchronized with a trip event or an input event, a sensor (not shown) that detects an operation of a mechanism for performing a trip or shutdown operation. Of course, the trip event or the input event can be detected by.

The synchronization module 2200 may perform a control operation so that the diagnosis module 2300 diagnoses the closed coil 21 or the trip coil 23 at predetermined intervals. When the event occurs during diagnosis of the diagnosis module 2300 or when an event occurs in the diagnosis target coil, the synchronization module 2200 stops diagnosis of the diagnosis module 2300 and controls the diagnosis module 2300 in a control circuit. It can be electrically separated from (20).

The diagnosis module 2300 may diagnose the close coil 21 and the trip coil 23 at predetermined intervals under the control of the synchronization module 2200. When an event occurs during diagnosis, the diagnosis module 2300 may stop the diagnosis and be electrically disconnected from the control circuit 20 by the control of the synchronization module 2200. However, if an event does not occur in the diagnosis object coil, the diagnosis module 2300 may maintain the electrical connection with the control circuit 20, in particular, the diagnosis object coil. That is, if an event does not occur in the diagnosis target coil, the diagnosis module may maintain a diagnosis operation. The diagnostic module 2300 may map the diagnostic related information to an identifier (eg, a closed coil identifier or a trip coil identifier) of the diagnosis target coil and store the diagnostic related information in the storage module 2400. The diagnostic module 2300 may be installed as shown in FIG. 8. One side of the diagnostic module 2300 is connected to both sides of the close coil through a first power supply line having a first switch, and the other side of the diagnostic module 2300 has a second power supply line having a second switch. Through this, it can be connected to both sides of the trip coil. The first switch may be turned on when the close coil is diagnosed and the second switch may be turned on when the trip coil is diagnosed by the control of the synchronization module 2300. The current detector may include a first CT that detects a current on the close coil and a second CT that detects a current on the trip coil. In addition, the diagnostic module 2300 may diagnose the close coil as described above using the current on the close coil detected through the first CT and the voltage supplied through the first power supply line, and through the second CT. The trip coil can be diagnosed as previously seen using the detected current on the trip coil and the voltage supplied through the second power supply line.

Details of the storage module 2400, the interface module 2500, and the notification module 2600 have been described above.

Hereinafter, a diagnosis apparatus according to another exemplary embodiment of the present invention will be described with reference to FIG. 14.

14 is a schematic view of a state in which a diagnostic apparatus according to another embodiment of the present invention is installed in a breaker.

Referring to FIG. 14, the diagnosis apparatus 3000 may be connected in a parallel structure to a trip coil (or a close coil) that is a diagnosis target. The specific structure and operation of the diagnostic apparatus 3000 may be as described above.

However, since the parallel structure, when the event detection module in the diagnostic device 3000 detects the event using the voltage on the trip coil (or close coil) to be diagnosed, the event detection module is on the trip coil (or close coil) Wiring for detecting the voltage may be added. In FIG. 14, L5 and L6 represent power supply lines for supplying power to the trip coil 23 or the close coil 21.

Hereinafter, another diagnostic device according to still another embodiment of the present invention will be described with reference to FIG. 15.

15 is a schematic view of a state in which a diagnostic apparatus according to another embodiment of the present invention is installed in a breaker.

Referring to FIG. 15, the diagnostic apparatus 4000 may be connected in a parallel structure to a trip coil and a close coil which are diagnosis targets. The specific structure and operation of the diagnostic apparatus 4000 may be as described above.

However, since the parallel structure, when the event detection module in the diagnostic device 4000 detects the event using the voltage on the trip coil and the close coil to be diagnosed, the event detection module is a wiring for detecting the voltage on the trip coil and the closed coil. Can be added. Alternatively, the diagnostic apparatus 4000 may have a structure in which one of the trip coil and the close coil is connected in series and the other in parallel. In FIG. 15, L7 and L8 represent power supply lines for supplying a diagnostic voltage to the close coil 21, and L9 and L10 represent power supply lines for supplying a diagnostic voltage to the trip coil 23.

Hereinafter, a circuit breaker diagnosis method according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 16.

16 is a flowchart illustrating a circuit breaker diagnosis method according to an exemplary embodiment of the present invention. The following method may be applied to at least one of the diagnostic devices of FIGS. 3 to 15. By the following description, the structure of the diagnostic device of FIGS. 3 to 15 can be made clear.

Referring to FIG. 16, first, the synchronization module may determine whether a predetermined time has elapsed (S161).

In operation S162, the event sensing module may determine whether an event occurs. Here, the event may be an event generated in the coil to be diagnosed. Alternatively, the event may be an event generated in a coil other than the coil to be diagnosed. In addition, determining whether or not an event occurs may determine whether an event exists at a time point to start diagnosis. Details of the event detection operation are as described above.

If it is determined in S162 that an event has occurred in the coil to be diagnosed or another coil other than the diagnosis target coil (in other words, in response to the event detecting module detecting the event), the diagnostic apparatus does not diagnose the coil. Can wait until the preset time elapses. As previously described, the diagnostic device may be electrically connected to the coil to be diagnosed only at the time of diagnosis. Therefore, when it is determined that an event has occurred in the diagnosis target coil or the circuit breaker control circuit at the time of diagnosis, it is possible to prevent malfunction of the circuit breaker at the event by not electrically connecting the diagnosis device to the diagnosis target coil.

On the contrary, if it is determined in S162 that an event has not occurred in the diagnosis target coil or the circuit breaker control circuit (in other words, in response to the event detecting module not detecting the event), the diagnosis voltage is applied and the diagnosis is performed. The target coil may be diagnosed (S163 and S164). Details of the diagnosis may be as described above.

In operation S165, it may be determined whether an event occurs during the diagnosis.

If it is determined in S165 that an event has occurred in the diagnosis target coil or the circuit breaker control circuit during diagnosis (in other words, in response to the event detecting module detecting the event), the diagnosis is stopped, and the diagnosis apparatus is electrically connected to the diagnosis target coil. Can be separated (S166). The diagnostic apparatus can wait until the next diagnostic time arrives. Here, the diagnostic apparatus may perform S166 according to a control signal from an event sensing module or a synchronization module corresponding to the event.

If an event does not occur in the diagnosis target coil or the circuit breaker control circuit during diagnosis in S165 (in other words, in response to the event detecting module not detecting the event), the diagnosis operation may be continued when the diagnosis is not completed. When the diagnosis is completed, the diagnosis apparatus may wait until the next diagnosis time arrives (S167).

The method of FIG. 16 may be performed in whole or in part. For example, S162 may be implemented in a omitted form. Alternatively, S165 may be omitted. Alternatively, S165 may be omitted. In addition, it may be implemented simply by S161, S163, S164 only. And, it may be implemented only in S161 to S164. Alternatively, it may be implemented only in S162 to S167.

Hereinafter, a circuit breaker diagnosis apparatus according to still another exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 15 and 17.

17 is a functional block diagram of a diagnostic apparatus according to another embodiment of the present invention. The description of the duplication of the above description is omitted or simplified.

Referring to FIG. 17, the diagnosis apparatus 5000 may diagnose a coil to be diagnosed in which an event occurs in synchronization with an end of an event. By such a diagnostic coil diagnosis, when there is an abnormality in the breaker operating characteristic after the event occurs, it is possible to provide a determination index as to whether the abnormality of the operating characteristic is caused by the coil.

In detail, the diagnostic apparatus 5000 may include an event sensing module 5100, a synchronization module 5200, a diagnostic module 5300, a storage module 5400, an interface module 5500, and a notification module 5600. . The diagnostic apparatus 5000 of FIG. 17 may be implemented in the form as shown in FIGS. 3 to 15 or may be installed on a control circuit. The diagnosis apparatus 5000 may be implemented in a form of diagnosing at least one of the trip coil and the close coil.

As described above, the event detection module 5100 may detect an event.

The event sensing module 5100 may be implemented as shown in FIG. 5. In this case, the event detection module 5100 detects the occurrence and termination of the event by using a voltage on the trip line L2 or the close line L1 or the trip coil 23 or the close coil 21. Can be. In contrast, as described above, the event sensing module 5100 may sense the occurrence and termination of the event by using a current on the trip line L2 or the close line L1. In this case, the diagnostic apparatus 5000 may be installed on the control circuit 20 in the same manner as in FIG. 6.

Alternatively, the event detection module 5100 may be implemented in the form as shown in FIG. 7. In this case, the event detection module 5100 may detect the occurrence and termination of the trip event (or the close event) using the trip signal (or the close signal).

In addition, the event sensing module 5100 may be implemented as shown in FIG. 11. In this case, the event sensing module 5100 uses the voltage at any point on the close line L1 and the trip line L2, preferably the voltages at the input side of the close coil 21 and the trip coil 23 of the event. Occurrence and termination can be detected.

In addition, the event sensing module 5100 may be implemented in the form as shown in FIG. 12. In this case, the switch unit 2130 may be switched by a control signal according to the type of event detected by the event sensing module 5100 or other elements. That is, when the detected event is a trip event, the input terminal of the comparator may be switched to be connected to the trip line L2. Alternatively, when the sensed event is an input event, the input terminal of the comparator may be switched to be connected to the closed line L1. According to the switched state, the event sensing module 5100 may detect the occurrence and termination of the trip event or the close event.

In addition, the event sensing module 5100 may be implemented in the form as shown in FIG. 13. In this case, the event sensing module 5100 may receive the close signal and the trip signal, and sense the occurrence and the termination of the event using the received close signal or the trip signal.

In the manner described in Figures 2 to 15 the present invention can recognize the occurrence and termination of the event, of course, the present invention does not limit the matter that recognizes the occurrence and termination of the event.

The event sensing module 5100 may output a signal corresponding to the detected event to the synchronizer 5200.

The synchronizer 5200 may control a diagnosis operation of the diagnosis module 5300 based on the event detection result of the event detection module 5100. The synchronizer 5200 may be synchronized with the end of the event to control the diagnostic module 5300 to diagnose the trip coil and / or the close coil. At this time, the synchronization unit 5200 may control the diagnostic module 5300 to diagnose the trip coil when the trip event ends. Alternatively, the synchronization unit 5200 may control the diagnostic module to cause the diagnosis module 5300 to diagnose the close coil when the close event ends. On the contrary, if the diagnostic apparatus 5000 diagnoses only one of the closed coil and the trip coil, the synchronization unit 5200 may selectively omit an element for controlling the diagnostic operation of the diagnostic apparatus 5300.

The synchronization unit 5200 may control the diagnosis module 5300 to cause the diagnosis module 5300 to start diagnosis when an event ends or when a preset time exceeds when the event ends. In addition, when an event occurs during diagnosis, the synchronizer 5200 may control the diagnosis module 5300 to terminate the diagnosis. When the diagnosis is completed, the diagnosis module 5300 may be electrically disconnected from the coil to be diagnosed. Here, the electrical separation may mean that a current flowing in or out of the control circuit 20 into the diagnostic module 5300 is equal to or less than a preset value.

The diagnosis module 5300 may start or stop diagnosis under the control of the synchronizer 5200. The matters and structure for diagnosing the coil to be diagnosed by the diagnostic module 5300 are as described above.

The functions and operations of the storage module 5400, the interface 5500, and the notification module 5600 are as described above.

Hereinafter, a circuit breaker diagnosis method according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 15 and 18. Thereby, the structure of the above-mentioned diagnostic apparatus can be made clear.

18 is a flowchart illustrating a circuit breaker diagnosis method according to another exemplary embodiment of the present invention. Descriptions of overlapping descriptions will be omitted or simplified.

Referring to FIG. 18, first, the event sensing module 5100 may determine whether an event ends (S181). If it is determined in step S181 that the event is not finished, the diagnostic apparatus may not start diagnosis until the event termination occurs.

In contrast, if it is determined in step S181 that the event is finished, the diagnostic apparatus 5000 may start diagnosis. In this case, the synchronization unit 5200 may control the diagnostic module 5200 so that the diagnostic module 5200 starts diagnosis (S182). The diagnosis module 5200 may be electrically connected to a diagnosis target coil by a signal for initiating a diagnosis.

In addition, the synchronization unit 5200 may determine whether an event is detected by the event sensing module 5100 during diagnosis (S183).

If it is determined in step S183 that the event occurs, the synchronization unit 5200 may stop the diagnosis of the diagnostic module 5200 (S184). In this case, only when an event for the diagnosis target coil occurs, the synchronizer 5200 may stop diagnosis of the diagnosis module 5300. By the control of the synchronizer 5200, the diagnosis module 5200 may be electrically separated from the diagnosis target coil at the end of diagnosis. When the event generated during the diagnosis is finished, the diagnosis target coil corresponding to the terminated event can be diagnosed according to S181 and S182.

On the contrary, if it is determined in S183 that no event occurs, the synchronizer 5200 may not stop the diagnosis of the diagnosis module 5300.

The process of FIG. 18 may be performed in whole or in part. For example, S183 and S184 may be omitted. In this case, the diagnosis apparatus 5000 may be embodied in a simple form of diagnosing a coil to be diagnosed by simply synchronizing that the event ends. And, it may be performed alone S182.

As described above, the present invention can always diagnose the resistance and / or inductance of the close coil and / or the trip coil every predetermined time.

In the present invention, the coil is electrically disconnected from the coil to be diagnosed at a time when the diagnosis module does not diagnose the coil to be diagnosed, so that the coil can be always diagnosed without affecting the operation characteristics of the circuit breaker.

In addition, according to the present invention, when the event detection module detects that an event has occurred in the diagnosis target coil during diagnosis of the diagnosis target coil, by controlling the diagnosis module to stop the diagnosis, the breaker operating characteristic may not be changed at all by the diagnosis. have. As a result, misdiagnosis of the trip coil may be prevented.

In addition, the present invention can prevent the breaker operation characteristic from being changed by the diagnostic apparatus by making the input impedance of the event sensing module infinite in at least one of a closed line and a trip line provided with a diagnosis target coil.

In addition, the present invention can always diagnose the resistance and / or inductance of the coil in a variety of ways using a DC voltage or an alternating voltage.

In addition, the present invention can diagnose the coil to be diagnosed every time an event occurs in the circuit breaker. Thereby, at the time of abnormality of a circuit breaker operation characteristic, it can be diagnosed whether the abnormality is due to a diagnosis object coil.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

10: relay 20: control circuit
21: close coil 22: close switch
23: trip coil 24: trip switch
1000, 2000, 3000, 4000, 5000: Diagnostic device
1100, 2100, 5100: event detection module
1200, 2200, 5200: synchronization module
1300, 2300, 5300: Diagnostic Modules 1400, 2400, 5400: Storage Modules
1500, 2500, 5500: Interface Module
1600, 2600, 5600: notification module

Claims (17)

An event sensing module configured to detect whether an event has occurred in the coil on the control circuit; And
In response to the event sensing module detecting that there is no event for the coil, a diagnostic voltage is applied to the coil to be diagnosed, and the resistance and inductance of the coil to be diagnosed using the applied diagnostic voltage and the current on the coil to be diagnosed. Diagnostic module for diagnosing at least one of
Breaker operation characteristic diagnostic device comprising a. The method of claim 1,
And a synchronization module for controlling the diagnosis module to start diagnosis when a preset time elapses. The method of claim 1,
And a diagnostic module is electrically disconnected from the diagnosis target coil when the diagnosis coil is not diagnosed. 3. The method of claim 2,
And the synchronizing module controls the diagnosis module to stop the diagnosis when the event sensing module detects that an event occurs in the coil on the control circuit during diagnosis of the diagnosis target coil. The method of claim 3, wherein
The diagnostic module
A diagnostic voltage supply unit connected to the diagnosis target coil through a power supply line provided with a switch to apply the diagnosis voltage to the diagnosis target coil;
And the switch is turned on only when the diagnosis target coil is diagnosed by a control signal. The method of claim 5, wherein
And the switch is turned off in response to the event sensing module detecting that an event has occurred in a coil on the control circuit during diagnosis. The method of claim 1,
And an input impedance of the event detection module as viewed from at least one of a close line and a trip line provided with the coil to be diagnosed is a threshold value or more. The method of claim 1,
And the event sensing module comprises comparators for outputting different voltages depending on the presence of an event on a coil on the control circuit. The method of claim 1,
The event sensing module determines whether an event has occurred in the coil on the control circuit using at least one of a change in voltage on a line on which the coil on the control circuit is installed, a change in current on the coil on the control circuit, and the presence of an event signal. Breaker operating characteristics diagnostic device, characterized in that for detecting. The method of claim 1,
The event sensing module detects a current on a coil on the control circuit using a current transformer (CT), and when it is determined that the current on a coil on the control circuit exceeds a preset value, an event occurs in the coil on the control circuit. Breaker operation characteristic diagnostic device, characterized in that the detection. The method of claim 1,
The diagnostic module
DC voltage is applied to the diagnosis target coil,
Equation,

By this,
Breaker operation characteristic diagnostic apparatus, characterized in that for calculating the resistance of the diagnosis target coil. The method of claim 1,
The diagnostic module
AC voltage having one frequency is applied to the coil to be diagnosed,
And calculating at least one of a resistance and an inductance of the coil to be diagnosed using a phase difference between the voltage applied to the coil to be diagnosed and the current on the coil to be diagnosed. The method of claim 1,
The diagnostic module
An AC voltage having a first frequency and an AC voltage having a second frequency are applied to the diagnosis target coil,
Calculating a first impedance of the coil to be diagnosed with respect to the first frequency and a second impedance of the coil to be diagnosed with respect to the second frequency,
By allocating the calculated first impedance and second impedance,
And at least one of a resistance and an inductance of the coil to be diagnosed. The method of claim 1,
The breaker operation characteristic diagnostic apparatus, characterized in that installed in at least one of a closed line and a trip line in which the diagnosis target coil is installed in a series or parallel structure. Determining, by the event sensing module, whether an event has occurred in a coil on the control circuit; And
If it is determined that no event occurs in the coil on the control circuit, the diagnostic module applies a diagnostic voltage to the coil to be diagnosed, and uses the applied diagnostic voltage and the current on the coil to be diagnosed to determine the resistance and the resistance of the coil. Diagnosing at least one of the inductances. The method of claim 15,
Determining, by an event sensing module, whether an event occurs in a coil on the control circuit during diagnosis of the diagnosis target coil; And
And if it is determined that an event has occurred in the coil on the control circuit during the diagnosis of the diagnosis target coil, the diagnosis module further comprises stopping the diagnosis. The method of claim 15,
And if it is determined that an event has occurred in the coil on the control circuit during the diagnosis of the diagnosis target coil, the diagnosis module electrically disconnects the diagnosis module from the diagnosis target coil.

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