KR20170136843A - Leakage Current Detecting Apparatus for detecting Plus Signal and Minus Signal, Leakage Breaker, and Method therefor - Google Patents

Abstract

The present invention relates to a leakage current sensing device capable of detecting positive and negative signals, an electric leakage blocking device, and a leakage current sensing method using the same, more specifically, to a leakage current sensing device and a method thereof capable of detecting both positive and negative signals, and an electric leakage blocking device and a method thereof using the same. Unlike a leakage current sensing circuit used in an existing circuit breaker, which detects only negative waveforms or positive waveforms from electric leakage detection signals of inputted AC, the leakage current sensing device and method of the present invention extract a positive signal as the same positive signal from electric leakage detection signals of inputted AC and extract a negative signal after reversing the same into a positive signal, merge the extracted signals, amplify the merged signal, and compare the amplified signal with a reference level to determine whether to output a trip signal. Therefore, the leakage current sensing device and method secure constant and rapid blocking time regardless of the position of the phase of a leakage current start point. Accordingly, the electric leakage blocking device and method have excellent malfunction prevention function and wide operation voltage by accurately and quickly analyzing and determining a signal inputted to the leakage current sensing device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak current detecting apparatus, a leakage current detecting apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leakage current detection device capable of detecting an onion wave, a leakage current blocking device, and a leakage current detection method using the leakage current detection device. More particularly, Unlike the case where only the negative waveform or the positive waveform is detected, a positive signal is extracted as a positive signal from an AC leakage current detection signal inputted, and a negative signal is inverted to a positive signal and extracted, And the amplified signal is compared with the reference level to decide whether or not the trip signal is output. By detecting the on-state that the phase of the leakage current starting point is constant regardless of the position, A leakage current sensing device and a signal input to the leakage current sensing device And more particularly, to a leakage preventing device that has an excellent malfunction prevention function by analyzing and judging accurately and quickly and has a wider operating voltage range than a conventional malfunction prevention technique, and a leakage current sensing method.

In the leakage current detection circuit used in the conventional earth leakage breaker, only the negative waveform or only the positive waveform is detected, and only one of the waveforms is used for the leakage current detection.

According to such a conventional leakage current detection circuit, the opposite waveform of the currently detected waveform can not be detected. For example, if the present positive waveform is being detected, the waveform generated in the negative signal can not be detected, There is a problem that a considerable error occurs in the operation time for blocking the electric leakage and the blocking time is relatively slow.

Referring to FIG. 1, in a conventional leakage current detection circuit, if a circuit using only a positive waveform among the leakage detection signals of AC inputted is not detected as shown in the graph on the left side, the output waveform can not be detected It becomes a figure.

It is possible to shorten the operation time for shorting the leakage current by several milliseconds through a method of adjusting the C value of the noise canceling circuit in the circuit in the conventional leakage current detecting circuit. In this case, however, even in the case of a positive waveform or a negative waveform The leakage current sensing circuit using only one half wavelength is problematic in that a time difference of about 1/2 T (cycle) with respect to the commercial frequency occurs, as compared with the case where both waveforms are used.

In addition, when the conventional leakage current detection circuit is used to implement a malfunction prevention electrical leakage prevention device, it is necessary to input and judge a plurality of signals in order to prevent a malfunction. Therefore, There is a time difference of about 1T (cycle) and there is no allowance in operation time.

In addition, when a leakage current detection circuit is used to implement an electric leakage preventing device and then a malfunction prevention function is provided, there is a problem that the operation range is limited due to a change in temperature characteristics and an operation current of the relay in using the relay .

Korean Unexamined Patent Publication No. 10-2012-0090872 " Standby power automotive short-circuited type earth leakage breaker " as one of related arts related to the earth leakage breaker has provided an earth leakage breaker that takes into consideration the use of standby power. However, I still had problems.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and it is an object of the present invention to provide a leakage current detection circuit for use in a conventional earth leakage breaker, which detects only a negative waveform or a positive waveform, Among the leakage current detection signals of AC input, the positive signal is extracted as a positive signal as it is, the negative signal is inverted into a positive signal, and the extracted two signals are amplified. The amplified signal is compared with a reference level, The present invention also provides an apparatus and method for detecting leakage current of an onion which can obtain a constant blocking time regardless of the position of a starting point of leakage current.

Another object of the present invention is to overcome the above problems and to provide a leakage current sensing apparatus capable of accurately and quickly analyzing and judging a signal input to the leakage current sensing apparatus by using the leakage current sensing apparatus capable of detecting an onion as described above The present invention provides an electric leakage preventing device and method which are excellent in a malfunction prevention function and have a wide operating voltage range.

The present invention relates to a leakage current detecting device capable of detecting an onion wave, comprising: signal input means for detecting a leakage current of a load device using a separate phase current transformer and receiving an AC leakage current detection signal; An onion extraction means for separating a negative waveform and a positive waveform from an electrical leak detection signal of an AC input and extracting the positive signal as a positive signal as it is and inverting the negative signal into a positive signal; Noise removing means for removing a noise component of the extracted signal; Merging means for merging the noise canceled signal into one signal consisting of only a positive signal; Amplifying means for amplifying the merged signal; Comparison means for comparing the amplified signal with a preset reference level to determine whether a leakage current is generated; Signal output means for outputting a trip signal as a separate shutoff means when it is determined that a leakage current has occurred; And DC power supply means for supplying operating power.

The present invention relates to an electric leakage screening device using an onion-detectable leakage current sensing device, and more particularly, to a visual current transformer that inputs an electric current leakage detection signal of an AC load of a load device to a leakage current sensing device. A leakage current detecting device for detecting a leakage current by using a leakage detection signal of an AC input and inputting a trip signal as a blocking means; A shutoff means for receiving a trip signal from the leakage current sensing device to shut off the current of the load device; And a control unit for controlling operations of the video current transformer, the leakage current sensing unit, and the blocking unit, wherein the leakage current sensing unit detects a leakage current of the load unit using the video current transformer, A signal input means for receiving a detection signal; An onion extraction means for separating a negative waveform and a positive waveform from an electrical leak detection signal of an AC input and extracting the positive signal as a positive signal as it is and inverting the negative signal into a positive signal; Noise removing means for removing a noise component of the extracted signal; Merging means for merging the noise canceled signal into one signal consisting of only a positive signal; Amplifying means for amplifying the merged signal; Comparison means for comparing the amplified signal with a preset reference level to determine whether a leakage current is generated; Signal output means for outputting a trip signal to the blocking means when it is determined that a leakage current has occurred; And DC power supply means for supplying operating power.

At this time, the control means includes: receiving means for receiving judgment basic information from the leakage current sensing device; And analysis means for analyzing the received judgment basic information and judging whether or not a trip signal is generated.

Here, the determination basic information may be any one or more of an electrical leak detecting signal for AC of the load device, a merge signal composed only of a positive signal or a negative signal, a reference level, and a trip signal.

According to another aspect of the present invention, there is provided a leakage current blocking method using a leakage current sensing apparatus, comprising the steps of: (A) inputting a leakage current detection signal of an alternating current of a load device to a leakage current sensing apparatus; (B) The leakage current sensing device of the earth leakage breaker separates a negative waveform and a positive waveform separately from the leakage detection signal of the input AC, extracts the positive signal as a positive signal as it is, And inverting the signal; (C) the leakage current sensing device of the earth leakage blocking device removing the noise component of the extracted signal; (D) merging the noise-removed signal into one signal consisting of only a positive signal; (E) a leakage current sensing device of the earth leakage shutoff device amplifying the merged signal; (F) determining whether a leak current is generated by comparing the amplified signal with a predetermined reference level; (G) outputting a trip signal to the control means when the leakage current sensing device of the earth leakage breaker determines that a leakage current has occurred; And (H) the control means of the electric leakage screening device analyzes whether the trip signal is properly generated by receiving the trip signal, and if it is determined that the generation of the trip signal is appropriate, outputting the trip signal to the blocking means .

According to the present invention, unlike a leakage current detection circuit used in a conventional leakage circuit breaker, only a negative waveform or a positive waveform is detected from an AC leakage detection signal, the positive signal of the AC leakage current detection signal The negative signal is inverted to a positive signal, the extracted two signals are amplified, and the amplified signal is compared with a reference level to determine whether to output the trip signal, It is possible to obtain a constant and fast blocking time irrespective of the position of the phase.

According to the present invention, it is possible to more accurately and quickly analyze and judge a signal input to the leakage current sensing device using the above-described on-leak detectable leakage current sensing device, thereby improving the malfunction prevention function, There is also an effect of providing a blocking device and method.

1 is a reference diagram for explaining an output waveform in a conventional leak current sensing circuit;
2 is a schematic configuration diagram of a leakage current sensing apparatus according to a preferred embodiment of the present invention.
3 is a reference diagram for explaining an output waveform in the leakage current sensing device according to the present invention.
FIG. 4 is a schematic diagram of a leakage current cutoff apparatus using a leakage current sensing apparatus according to a preferred embodiment of the present invention. FIG.
5 is a partial schematic circuit diagram of an electric leakage screening device using an onion detectable leakage current sensing device according to a preferred embodiment of the present invention.
FIG. 6 is an overall flowchart of a leakage current blocking method using an onion detectable leakage current sensing apparatus according to a preferred embodiment of the present invention. FIG.

Before describing the specific details for the practice of the invention, terms and words used in the specification and claims should be construed to enable the inventor to properly define the concept of a term in order to best describe its invention It should be interpreted as meaning and concept consistent with the technical idea of the present invention.

It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

Hereinafter, an onion detectable leakage current sensing apparatus according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 2 and FIG.

FIG. 2 is a schematic configuration diagram of a leakage current sensing apparatus according to a preferred embodiment of the present invention, and FIG. 3 is a reference diagram for explaining an output waveform in the leakage current sensing apparatus according to the present invention.

2, the leakage current sensing apparatus according to the preferred embodiment of the present invention includes a signal inputting means 10, an onion extracting means 20, a noise removing means 30, a merging means 40, Means 50, comparison means 60, signal output means 70 and DC power supply means (not shown).

First, the signal input means 10 receives an electric leak detection signal of alternating current of the load device from a separate phase current transformer.

Next, the onion extraction means 20 separates the negative waveform and the positive waveform from the leakage detection signal of the input AC, extracts the positive signal as a positive signal as it is, and inverts the negative signal as a positive signal .

In the preferred embodiment of the present invention, the positive signal is directly extracted as a positive signal and the negative signal is inverted as a positive signal. However, the present invention is not limited to this, And it is sufficient to use one signal consisting of only a positive signal or a negative signal.

Next, the noise removing means 30 removes the noise component of the extracted signal.

Next, the merging means 40 merges the extracted two signals into one signal consisting of only a positive signal. At this time, a merge circuit can be used.

Next, the amplifying means 50 amplifies the merged signal. At this time, a differential amplifier circuit can be used.

Next, the comparison unit 60 determines whether a leakage current is generated by comparing the amplified signal with a predetermined reference level. If the amplified signal is higher than a predetermined reference level, it is determined that a leakage current has occurred.

Next, the signal output means 70 outputs the trip signal to the separate control means or outputs it to the blocking means when it is judged that the leakage current has occurred.

The DC power supply means ensures the accuracy of the reference level and functions to supply stable power. Generally, in the conventional earth leakage breaker, the reference level may fluctuate depending on the voltage fluctuation, which may adversely affect the sensitivity of the earth leakage breaker. According to the present invention, such a problem can be solved by the stable power supply of the DC power supply means.

Hereinafter, an electric leakage preventing device using an onion detectable leakage current sensing device according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

4 is a schematic block diagram of a leakage current cutoff apparatus using a leakage current sensing apparatus according to a preferred embodiment of the present invention.

4, the leakage current blocking device using the onion detectable leakage current sensing device according to the preferred embodiment of the present invention includes a voltage transformer 100, a leakage current sensing device 200, a blocking device 300, And a control unit 400. [

The voltage transformer 100 inputs an AC electric leak detection signal of the load device to the leakage current detection device 200.

The leakage current sensing apparatus 200 includes a signal inputting means 10, an onion extracting means 20, a noise removing means 30, a merging means 40, an amplifying means 50, a comparing means 60, A power supply 70, and a DC power supply unit. The detailed configuration is not described here because it is described above.

When the trip signal is inputted from the leakage current sensing device 200, the blocking means 300 cuts off the current of the load device and can be configured as a trip coil.

The control means 400 controls the operations of the video current transformer 100, the leakage current sensing device 200 and the blocking means 300 and particularly performs a malfunction prevention function of the leakage current sensing device 200.

The control means 400 may comprise a microcontroller and may include receiving means 410, analysis means 420 and a database 430.

The receiving means 410 receives the determination basic information from the leakage current sensing device 200. The types of the determination basic information include an AC signal of the load device, a merge signal or an amplified signal composed only of a positive signal, A trip signal, and the like.

The analyzing means 420 analyzes whether the generation of the trip signal is appropriate by comparing the received determination basic information with the comparison object information, and analyzes the malfunction or not and outputs the analysis result to another manager terminal.

Specifically, the analyzing means 420 compares the AC signal of the load device, the merge signal or the amplified signal constituted by only the positive signal, the reference level, the trip signal, The comparison of the AC signal of the load device with the merge signal composed only of the positive signal, the reference level, the trip signal, etc., and if the difference value or the total difference value between the items is within the predetermined allowable limit, .

On the other hand, the analysis means 420 determines whether or not the trip signal is generated by using the judgment basic information instead of or in addition to the function of judging whether the generation of the trip signal is appropriate by comparing the judgment basic information with the comparison object information The information used may be the length of the signal input from the leakage current sensing device 200, the time between the signal and the signal, the number of input signals within the set time, and the like.

The database 430 may store judgment basic information and comparison target information, and items of judgment basic information or information to be compared may be an AC signal of a load device, a merge signal composed only of a positive signal, a reference level, a trip signal, or the like The determination basic information may be input from the leakage current sensing apparatus 200. The comparison target information may be input from another manager terminal or updated by an input from the leakage current sensing apparatus 200. [

In the present invention, the control means 400 comprises a microcontroller and provides an analysis function for preventing malfunction or a function for determining whether a trip signal is generated, which is not provided in a conventional earth leakage breaker. The current transformer 100 and the breaking means 300 may be associated with the components used in the conventional earth leakage breaker, but the leakage current sensing device 200 and the control means 400 are not limited to the specific components It can not be understood that the earth leakage preventing device according to the present invention is a conventional earth leakage breaker.

In particular, the control means 400 may receive a signal from the signal output means 70 of the leakage current sensing apparatus 200 and analyze the signal to generate a trip signal when it is determined that the leakage current is present.

Specifically, the control means 400 receives a signal from the signal output means 700 of the leakage current sensing apparatus 200 and analyzes it. In response to receiving the first, second, and third signals, (Time), measuring the time between rising edges of each signal, measuring the time between the falling edge of the preceding signal and the rising edge of the next signal, analyzing the measured data through this entire process, The leakage current is recognized as a leakage current and a trip signal is generated. If the leakage current is out of the error range, it is determined that the leakage current is not a leakage current and the trip signal is not generated.

Hereinafter, a circuit configuration of an electric leakage screening apparatus using an onion detectable leakage current sensing apparatus according to a preferred embodiment of the present invention will be described with reference to FIG. 5, which is a simplified circuit diagram.

FIG. 5 is a simplified circuit diagram of an electric leakage screening device using an onion detectable leakage current sensing device according to a preferred embodiment of the present invention.

In Fig. 5, it is possible to confirm the video current transformer 100, the circuit A for protecting the detection circuit in the overcurrent input, the onion extraction means 20, the comparison means 60, and the like.

Hereinafter, an electrical leakage preventing method using an onion detectable leakage current sensing apparatus according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

6 is an overall flowchart of an electrical leakage prevention method using an onion detectable leakage current sensing apparatus according to a preferred embodiment of the present invention.

First, as shown in Fig. 6, the video current transformer 100 of the electric leakage screening apparatus inputs an electric current leakage detection signal of AC of the load device to the leakage current detection device 200 (S10).

Next, the leakage current sensing apparatus 200 of the earth leakage shut-down device separates the negative waveform and the positive waveform separately from the leakage detection signal of the received AC, extracts the positive signal as a positive signal as it is, (S20).

Next, the leakage current sensing device 200 of the earth leakage blocking device removes the noise component of the extracted signal (S30).

Next, the leakage current sensing device 200 of the leakage current cut-off device merges the noise-removed signal into one signal composed only of a positive signal (S40).

Next, the leakage current sensing apparatus 200 of the leakage current blocking device amplifies the merged signal (S50).

Next, the leakage current sensing apparatus 200 of the leakage current cut-off device determines whether a leakage current is generated by comparing the amplified signal with a preset reference level (S60).

Next, when the leakage current sensing apparatus 200 of the earth leakage shutoff apparatus determines that a leakage current has occurred, it outputs a trip signal to the control means 400 (S70).

Finally, the control means (400) of the earth leakage shutoff device analyzes whether the trip signal is properly generated by receiving the trip signal and outputs a trip signal to the shutoff means (300) when it is determined that the occurrence of the trip signal is appropriate S80).

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications can be made without departing from the invention. Accordingly, all such modifications and variations are intended to be included within the scope of the present invention.

10: Signal input means
20: onion extraction means
30: Noise removing means
40: Merge means
50: amplification means
60: comparative means
70: Signal output means
100: Video current transformer
200: Leakage current sensing device
300: blocking means
400: control means
410: receiving means
420: means of analysis
430: Database

Claims (5)

In an onion detectable leakage current sensing device,
A signal input means (10) for detecting a leakage current of a load device by using a separate phase current transformer and receiving an AC leakage current detection signal;
An onion extracting unit 20 for separating a negative waveform and a positive waveform from an electrical leak detection signal of an AC input and extracting the positive signal as a positive signal and inverting the negative signal as a positive signal;
Noise removing means (30) for removing a noise component of the extracted signal;
Merge means (40) for merging the noise canceled signal into one signal consisting only of a positive signal;
Amplifying means (50) for amplifying the merged signal;
Comparison means (60) for comparing the amplified signal with a predetermined reference level to determine whether a leakage current is generated;
Signal output means (70) for outputting a trip signal as a separate shutoff means when it is determined that a leakage current has occurred; And
DC power supply means for supplying operating power.
In an earth leakage breaker using an onion detectable leakage current sensing device,
A video current transformer (100) for inputting a leakage detection signal of AC of the load device to the leakage current detection device (200);
A leakage current sensing device 200 that senses a leakage current by using an electric leakage detection signal of an AC input and inputs a trip signal to the isolation means 300;
A shutoff means (300) for receiving a trip signal from the leakage current sensing device (200) to shut off the current of the load device; And
And control means (400) for controlling the operation of the video current transformer (100), the leakage current sensing device (200) and the blocking means (300)
The leakage current sensing device (200)
A signal input means (10) for detecting a leakage current of the load device using the image current transformer (100) and receiving an AC leakage current detection signal;
An onion extracting unit 20 for separating a negative waveform and a positive waveform from an electrical leak detection signal of an AC input and extracting the positive signal as a positive signal and inverting the negative signal as a positive signal;
Noise removing means (30) for removing a noise component of the extracted signal;
Merge means (40) for merging the noise canceled signal into one signal consisting only of a positive signal;
Amplifying means (50) for amplifying the merged signal;
Comparison means (60) for comparing the amplified signal with a predetermined reference level to determine whether a leakage current is generated;
Signal output means (70) for outputting a trip signal to the shutoff means (300) when it is determined that a leakage current has occurred; And
And a direct current power supply means for supplying an operating power.
The method according to claim 2,
The control means (400)
Receiving means (410) for receiving determination basic information from the leakage current sensing device (200); And
And analyzing means (420) for analyzing the received judgment basic information and determining whether a trip signal is generated.
4. The method of claim 3,
Wherein the judgment basic information is at least one of an electric leakage detecting signal of alternating current of the load device, a merge signal constituted only by a positive signal or a negative signal, a reference level and a trip signal, Electric current leakage device using sensing device.
In the leakage current blocking method using the leakage current sensing device,
(A) inputting a leakage detection signal of alternating current of the load device to the leakage current sensing device (200) by the bridge transformer (100) of the earth leakage blocking device;
(B) The leakage current sensing device (200) of the earth leakage shutoff device separately separates a negative waveform and a positive waveform from an electrical leak detection signal of an AC input, extracts a positive signal as a positive signal as it is, Extracting the signal by inverting it with a positive signal;
(C) removing the noise component of the extracted signal by the leakage current sensing device (200) of the earth leakage blocking device;
(D) The leakage current sensing device (200) of the earth leakage blocking device merges the noise-removed signal into one signal consisting of only a positive signal;
(E) amplifying the merged signal by the leakage current sensing device (200) of the earth leakage blocking device;
(F) comparing the amplified signal with a predetermined reference level to determine whether a leakage current is generated, by the leakage current sensing device (200) of the leakage current cutoff device;
(G) outputting a trip signal to the control means (400) when the leakage current sensing device (200) of the earth leakage breaker determines that a leakage current has occurred; And
(H) The control means (400) of the electric leakage screening device analyzes whether or not a trip signal is properly generated by receiving a trip signal, and outputs a trip signal to the shutoff means (300) Wherein the leakage current detection device includes a leakage current detection device.

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