KR20160087581A - Method and Apparatus for Circuit Breaker Using Power Factor and Recordingmedium Storing a Program to Implement the Method - Google Patents

Abstract

Disclosed is an electrical leakage prevention device using a power limiting factor and a method thereof. According to the present invention, the electrical leakage prevention device using a power limiting factor includes: a square wave power supply unit which detects the waveform of an AC voltage to supply DC power within a phase angle range set before and after a peak point of the voltage as DC power supply operating an electronic circuit; an inverting amplifier which receives a leakage current output from a video current transformer operating with the power from the square wave power supply unit to change the leakage current to a voltage and amplify the voltage; a bipolar comparator which operates with the power from the square wave power supply unit and generates and transmits signals when an output received from the inverting amplifier is equal to or larger than a preset value exceeding a reference voltage and when the output value is equal to or less than the set reference value; and a delay detector which receives an output from the bipolar comparator operating with the power from the square wave power supply unit and outputs one or more outputs of a next comparator generated when the outputs are generated after a predetermined time; and a silicon controlled rectifier (SCR) driver which operates an SCR by receiving the outputs of the delay detector operating with the power from the square wave power supply unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical leakage preventing device using a power factor limit, a method thereof, and a recording medium on which a program for performing the method is recorded.

More particularly, the present invention relates to an electrical leak detecting apparatus using a power factor limit, a method thereof, and a recording medium on which a program for performing the method is recorded.

A short circuit is a current flowing from the electronic equipment connected to the AC power supply line or the line to the ground. Leakage may cause electric shock or fire, and may cause inefficient use of energy. It takes a lot of time to remove the deterioration of insulation resistance which causes a short circuit, the human body contact of the line, or the ground contact, which does not substantially help prevent an accident. For this reason, the AC power line must first be cut off to prevent electric shock or fire. Therefore, if a short circuit occurs, it is necessary to detect the current and to prevent the power line from being disconnected immediately after exceeding the value recognized as dangerous.

In such an earth leakage breaker, the leakage current is detected by detecting the remaining current of the current flowing in the power line by the induction coil (current transformer) magnetically coupled with the source line. The waveform of the detected leakage current is a sinusoidal wave having the same frequency as the waveform of the power supply voltage. If there is a phase difference in the sinusoidal wave of the leakage current and the power source voltage, the effective amount of the leakage current is reduced. The risk of fire or electric shock depends on the leakage current, and the effective component value is expressed as a power factor that can be interpreted as a cosine value which is the phase difference between the current and the voltage .

If there is no phase difference, that is, 0 degree, the cosine value is 1, 60 degrees, the cosine value is 0.5, and 45 degrees is 0.7071. If it is 30 degrees, it is 0.8660, and if it is 90 degrees, the cosine value becomes 0. As described above, if the phase difference is small, the power factor of the short circuit is close to 1 (100%) and the number of effective components is large, which increases the risk of electric shock or fire.

The conventional earth leakage breaker is designed to cut off at least a certain leakage current irrespective of the power factor. For example, FIG. 1 is a configuration diagram of a conventional conventional earth leakage breaker. When the output is higher than the set value, the signal is sent to the SCR driver 140, and the output is amplified by the semiconductor switch (SCR) 150 is turned on to activate the solenoid coil 160 to cut off the electric leakage.

In such a conventional earth leakage breaker, the waveform of the leakage current operates under the same conditions without considering the power supply voltage waveform and the phase difference. Regardless of the risk of leakage current, irrespective of the power factor of the leakage current power.

In modern electrical usage environments, capacitive and inductive coupling of the power line to the ground is increasing because computers, fluorescent lamps, LED lighting equipment and other household or industrial appliances take measures for the electronic wavelength of the equipment. For this reason, the conventional earth leakage breaker has an inconvenience that continuity of service is deteriorated due to frequent interruption of the earth leakage breaker.

SUMMARY OF THE INVENTION The present invention has been made in view of the technical background as described above, and it is an object of the present invention to provide a method and a system for detecting a leakage current waveform in a case where the phase of a leakage current waveform detected by a video deflector is within an angle set by a difference from a voltage waveform phase of an electric line, The present invention provides a recording medium on which a power factor limit leakage preventing device for performing power cut-off only when a power factor is equal to or greater than a set value and a leakage current occurring at a set current value or more, and a method thereof and a method thereof.

There is provided a solenoid for determining a short circuit by a video current transformer for detecting a vector sum of an AC power line current passing through a magnetic loop according to one aspect of the present invention for solving the above problems and for drawing a stop lever when a short- An electric leakage preventing device using an electronic circuit for operating a coil is a DC power source for operating an electronic circuit and detects a waveform of an AC power source voltage and supplies a DC power source only in a phase angle range set before and after a peak point of the voltage An inverting amplifier for receiving and amplifying a leakage current output from the phase current transformer operating as a power source of a square wave power supply, a rectifier circuit for receiving the output of the inverting amplifier, which operates as a power supply of the rectangular wave power supply, When it is equal to or higher than the set value and lower than the set value lower than the reference voltage, a signal is generated A bipolar comparator that receives the output of the bipolar comparator that operates as a power supply of the square wave power supply, and a delay detector that outputs the generated output when at least one output of the next comparator is generated after a predetermined time, And an SCR driver for receiving an output of the delay detector to operate a semiconductor controlled switching element (SCR).

In a preferred embodiment, the electrical leakage screening device further comprises a semiconductor switch (SCR) which activates a solenoid for pulling the breaker lever, which operates with the signal provided by the SCR driver.

In a preferred embodiment, the earth leakage protection device further comprises a power factor limiter for adjusting the square wave width of the square wave power supply.

In a preferred embodiment, the delay detector returns to its initial state if there is no comparator output of the next comparator.

According to another aspect of the present invention, there is provided a leakage current cut-off method comprising: detecting a waveform of an AC power source voltage as a DC power source for operating an electronic circuit in a rectangular-wave power supply, supplying a DC power only in a phase angle range set before and after a peak point of the voltage Receiving a leakage current output from a voltage transformer operating as a power source of the square wave power supply in an inverting amplifier and converting the voltage into a voltage and receiving an output of an inverting amplifier operating as a power source of the rectangular wave power supply in the bipolar comparator Generating and delivering a signal when the output is greater than or equal to a predetermined value that exceeds a reference voltage and less than a reference value; receiving an output of the bipolar comparator operating as a power supply of a square wave power supply in a delay detector , After a certain time, at least one output of the next comparator is generated Wu, in export the generated output stage and SCR driver receives the output of the delay detector operative as a power source of the square wave power supply and a step of thereby operating a semiconductor switching device (SCR, Silicon Controlled Rectifier).

In a preferred embodiment, the leakage cutoff method further comprises adjusting the square wave width of the square wave power supply in the power factor limiter.

In a preferred embodiment, the step of outputting the generated output returns to the initial state if there is no comparator output of the next comparator.

In the embodiment according to the present invention, when the circuit is operated only within a predetermined phase angle range based on the peak point of the voltage waveform obtained by connecting to the power supply line and the leakage current exceeds the power factor limit and the leakage current exceeds the set value The operation of the leakage current blocking device is reduced, thereby reducing unnecessary operation of the leakage current blocking device.

The use of the power factor limiting earth leakage interrupter of the present invention significantly reduces the harmful effect on the supply continuity of the AC power supply line by operating the earth leakage interrupter even though it has a low power factor and thus is not dangerous.

In addition, according to the embodiment of the present invention, the probability that the circuit breaker operates on noise, spark, and surge that deviates from the phase angle set before and after the peak of the power supply voltage peak point or does not exceed the delay time of the delay detector can be remarkably reduced.

Also, according to the embodiment of the present invention, the leakage current of a low power factor, in which the phase difference of the voltage and the phase of the leakage current vary greatly, is remarkably small, Therefore, the problem that the continuity of the electric supply is low is solved.

On the other hand, in the filter circuit for the prevention of electromagnetic interference of electric and electronic circuits, capacitive coupling leakage, frequent high frequency noise in the line, surge due to spark or inductive load, lightning surge, The problem is reduced.

FIG. 1 is a view showing a conventional earth leakage breaker.
FIG. 2 is a block diagram illustrating an internal configuration of a power factor limiting leakage preventing device according to an embodiment of the present invention. Referring to FIG.
FIG. 3 is a diagram for explaining an AC voltage peak synchronous square wave power supply 250 according to an embodiment of the present invention, showing a correlation between a power supply voltage waveform of a power supply line, a square wave power supply waveform, and a power factor limit.
4 is a diagram for explaining a process of operating a semiconductor switch through a bipolar comparator and a delay detector by receiving a ground wave waveform obtained by amplifying an output of a video current transformer with an inverting amplifier according to an embodiment of the present invention.
5 is a flowchart illustrating an operational flow of an electric leakage preventing apparatus using a power factor limit according to an embodiment of the present invention.
6 is a diagram illustrating a configuration of a computer device in which an electrical leakage cancellation method according to an embodiment of the present invention can be performed according to an embodiment of the present invention.

In the embodiment of the present invention, in a leakage preventing device for detecting a short circuit by detecting a vector sum of an AC power line current passing through a magnetic loop and cutting off the connection of the AC power supply line when the leakage current reaches a specific value, And a cut-off operation is performed in a range in which the difference in phase angle of the over-voltage is within a set value. In other words, there is provided a power factor limiting circuit breaker capable of detecting a leakage current only when the phase difference between the leakage current waveform and the AC power source voltage waveform is within the set range to operate the circuit breaker.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is intended to enable a person skilled in the art to readily understand the scope of the invention, and the invention is defined by the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that " comprises, " or "comprising," as used herein, means the presence or absence of one or more other components, steps, operations, and / Do not exclude the addition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

FIG. 2 is a block diagram illustrating an internal configuration of a power factor limiting leakage preventing device according to an embodiment of the present invention. Referring to FIG.

2, the power factor limiting leakage preventing apparatus 200 includes a phase transformer 210, an inverting amplifier 220, a bipolar comparator 230, a delay detector 240, an AC voltage peak synchronous square wave power supply 250, A power factor limiter 260, an SCR driver 270, a semiconductor switch 280, and a solenoid coil 290.

The video current transformer 210 of the earth leakage blocking device according to the embodiment detects the remaining current of the current vector sum as a result of passing the AC power line.

The inverting amplifier 220 receives the signal from the video current transformer 210 and converts the current into a voltage. The bipolar comparator 230 outputs a signal when the output waveform of the inverting amplifier 220 deviates from the set amplitude.

The delay detector 240 outputs an output signal when the signal continues to be supplied after a certain time after receiving the output of the bipolar comparator 230 and is reset to an initial state when the signal is not maintained

 The SCR driver 270 receives the signal from the delay detector 240 and outputs an output to drive the semiconductor switch (SCR) 280.

The operation of the electric leakage blocking device 200 using the power factor limit according to the embodiment can be controlled by the AC voltage peak synchronous square wave power supply 250 and the power factor limiter 260.

The AC voltage peak synchronous square wave power supply 250 is connected to an alternating current line as a power source for operating the positive polarity comparator 230, the delay detector 240 and the SCR driver 270 of the inverting amplifier 220, DC power is supplied in a certain phase angle range before and after the peak.

The semiconductor switch 280 is operated by receiving the output of the SCR driver 270 and the solenoid coil 290 is connected to the semiconductor switch 280 to control the cutoff lever when current flows.

In addition, the electric leakage blocking device using the power factor limit according to the embodiment may further include a power factor limiter 260. The power factor limit controller 260 adjusts the supply width (phase angle) of the AC voltage peak synchronous square wave power supply 250.

The AC voltage peak synchronous square wave power supply 250 is a main devise according to the embodiment of the present invention. It is directly connected to a power supply line and inverts only within a predetermined phase angle around a plus (+) peak of a voltage waveform 60 Hz sinusoidal wave And supplies DC power to operate the amplifier 220, the bipolar comparator 230, the delay detector 240, and the SCR driver 270.

The AC voltage peak synchronous square wave power supply 250 according to the embodiment adjusts the power factor limit of the earth leakage breaker by adjusting the phase angle as a power factor limit controller.

FIG. 3 is a diagram for explaining an AC voltage peak synchronous square wave power supply 250 according to an embodiment of the present invention, showing a correlation between a power supply voltage waveform of a power supply line, a square wave power supply waveform, and a power factor limit.

Referring to FIG. 3, when the power factor limit is set to 87%, since cos θ = 0.87 in the relationship between the power factor (Pf) and the phase difference between the voltage and current (θ), the cosine function The phase difference? Can be obtained by using the inverse function of?

Equation ^{(1) θ = cos -1 0.87} = 29.54

Since the square wave power must be supplied within 45 degrees before and after the peak value, the square wave width of the power supply is 59.08 degrees in phase angle. At 60 Hz, the period is 16.67 ms at 1/60 second, so the square wave width can be adjusted to 2.8 ms, which is about 1/6 of the period.

As shown in FIG. 3, an AC voltage peak synchronous square wave power supply 250 can be designed in an easy manner. When DC power is supplied only to a peak power supply voltage multiplied by a power factor in a power supply voltage (+ .

4 is a diagram for explaining a process of operating a semiconductor switch through a bipolar comparator and a delay detector by receiving a ground wave waveform obtained by amplifying an output of a video current transformer with an inverting amplifier according to an embodiment of the present invention.

Referring to FIG. 4, the output of the video current transformer 210 is a negative (-) output signal in a state in which the current is insufficient as viewed from the neutral line of the power supply line (line grounded on the supply side) It is judged reversely. The leakage current according to the embodiment is 100 when the amplitude is 87 when the reference value is 87.

Waveform (1) is a power factor of 100% with no phase difference from the power line voltage. Waveform (2) is determined to be an operation start time by power supply of the square wave power supply and exceeds the reference value even after about 1 ms of delay time of the delay detector While the semiconductor switch drive output operates to operate the earth leakage breaker, the waveform (3) is only 15 days after the delay time of the delay detector, so that the earth leakage breaker does not turn off.

As shown in Fig. 4, even when a short circuit is caused by a capacitor having a phase difference of -90 degrees, when it is operated as shown in the figure, it is determined that a short circuit which is 87/15 times of the reference value, about 5.8 times, Also, if the square wave pulse width is adjusted to about 2 ms by performing the power factor adjustment according to the embodiment of the present invention, it can be predicted that there is no blocking operation when the leakage current due to the pure capacitor, that is, the power factor is zero.

Hereinafter, the leakage current blocking method using the power factor limit according to the present invention will be described in turn. Since the function (function) of the electric leakage blocking method using the power factor limit according to the present invention is essentially the same as the function on the electric leakage preventing device using the power factor limit, a description overlapping with those of FIG. 1 to FIG. 4 will be omitted.

5 is a flowchart illustrating an operational flow of an electric leakage preventing apparatus using a power factor limit according to an embodiment of the present invention.

In step S510, a waveform of the AC power source voltage is detected as a DC power source for operating the electronic circuit in the rectangular wave power supply. In step S520, DC power is supplied only in a phase angle range set before and after the peak point of the voltage do.

In step S530, a leakage current output from a phase current transformer operating as a power source of the square wave power supply is received in an inverting amplifier, and a voltage is converted into a voltage and amplified.

In step S540, a signal is generated when the output of the inverting amplifier, which operates as the power supply of the square wave power supply, is greater than or equal to a predetermined value exceeding the reference voltage, In step S550, the generated signal is transmitted to the SCR driver. Specifically, when a delay detector receives an output of a bipolar comparator that operates as a power source of a square wave power supply, and a predetermined time later, when at least one output of the next comparator is generated, a process of outputting the generated output is performed.

In step S560, the SCR driver receives the output of the delay detector operating as the power supply of the square wave power supply, and operates the semiconductor controlled switching element (SCR) to operate.

In the embodiment according to the present invention, the leakage current of the image current transformer is received and amplified by an inverting amplifier. The bipolar comparator is used to determine whether the leakage current exceeds a predetermined level. The present invention also provides an electric leakage preventing device and a method thereof using a power factor limit for eliminating the unnecessary operation of an electric leakage preventing device for disconnecting a line by driving a breaking lever by magnetizing a solenoid coil by operating a semiconductor switch with an SCR driver.

To accomplish this, in the earth leakage blocking device and method using the power factor limit according to the embodiment, the circuit operates only within a predetermined phase angle range based on the peak point of the voltage waveform obtained by connecting to the power line, And, only when the leakage current exceeds the set value, the earth leakage breaker is operated.

If the power factor limiting circuit of the present invention is used, it is possible to significantly reduce the supply continuity of the AC power line due to the operation of the earth leakage breaker even though the power factor is low.

In addition, the probability that the circuit breaker operates on noise, sparks, and surges that deviate from the set phase angle before or after the peak point of the power supply voltage or does not exceed the delay time of the delay detector can be remarkably reduced.

Meanwhile, the electrical leak detecting method using the power factor limit according to the embodiment of the present invention can be implemented in a computer system or recorded on a recording medium. 6, the computer system includes at least one processor 121, a memory 123, a user input device 126, a data communication bus 126, a user output device 127, And may include a storage 128. Each of the above-described components performs data communication via the data communication bus 122. [

The computer system may further include a network interface 129 coupled to the network. The processor 121 may be a central processing unit (CPU) or a semiconductor device that processes instructions stored in the memory 123 and / or the storage 128.

The memory 123 and the storage 128 may include various forms of volatile or nonvolatile storage media. For example, the memory 123 may include a ROM 124 and a RAM 125.

Meanwhile, the data flow-based large-scale data stream processing method according to the embodiment of the present invention described above can be implemented as a computer-readable code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording media storing data that can be decoded by a computer system. For example, there may be a ROM (Read Only Memory), a RAM (Random Access Memory), a magnetic tape, a magnetic disk, a flash memory, an optical data storage device and the like. The computer-readable recording medium may also be distributed and executed in a computer system connected to a computer network and stored and executed as a code that can be read in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (8)

An electric leakage preventing device using an electronic circuit which operates a solenoid coil which judges a leakage current by a video current transformer that detects a vector sum of an AC power line current passing through a magnetic loop and pulls a blocking lever when a leakage current reaches a predetermined value,
A square wave power supply for detecting a waveform of an AC power source voltage as a DC power source for operating the electronic circuit and supplying DC power only in a phase angle range set before and after a peak point of the voltage;
An inverting amplifier for receiving a leakage current output from the voltage transformer operating as a power source of the rectangular wave power supply and converting the voltage into a voltage and amplifying the voltage;
A bipolar comparator that receives the output of the inverting amplifier and operates as a power supply of the square wave power supply to generate and deliver a signal when the output is greater than or equal to a predetermined value that exceeds the reference voltage and less than a reference value;
A delay detector for receiving the output of the bipolar comparator operating as a power supply of the square wave power supply and outputting the generated output when at least one output of the next comparator is generated after a predetermined time;
An SCR driver for receiving an output of the delay detector operating as a power supply of the rectangular wave power supply and operating a semiconductor controlled switching element (SCR); .
The apparatus according to claim 1,
A semiconductor switch (SCR) for activating a solenoid for pulling a breaker lever, operated by a signal provided by the SCR driver; Further comprising: an earth leakage current limiting unit that is connected to the earth leakage current limiting unit.
The apparatus according to claim 1,
A power factor limiter for adjusting the square wave width of the square wave power supply; Further comprising: an earth leakage current limiting unit that is connected to the earth leakage current limiting unit.
2. The apparatus of claim 1, wherein the delay detector
And returns to the initial state when there is no comparator output of the next comparator.
1. A leakage preventing method using an electronic circuit that operates a solenoid coil that determines a leakage current by a video current transformer that detects a vector sum of an AC power line current passing through a magnetic loop and pulls a shutoff lever when a leakage current reaches a predetermined value,
Detecting a waveform of the AC power supply voltage as a DC power source for operating the electronic circuit in the square wave power supply and supplying the DC power only in a phase angle range set before and after the peak point of the voltage;
Receiving a leakage current output from the phase transformer operating as a power source of the square wave power supply in an inverting amplifier, converting the voltage into a voltage and amplifying the voltage;
Generating and delivering a signal when the output of the inverting amplifier is greater than or equal to a predetermined value that is greater than or equal to a predetermined value exceeding the reference voltage and is less than or equal to a set value that is less than or equal to the reference voltage and is operating as a power supply of the square wave power supply in the bipolar comparator ;
Outputting the generated output when a delay detector receives an output of the bipolar comparator operating as a power supply of the rectangular wave power supply and at least one output of the next comparator is generated after a predetermined time;
Operating an SCR (Silicon Controlled Rectifier) by receiving an output of the delay detector operating as a power supply of the square wave power supply in an SCR driver; .
6. The method according to claim 5,
Adjusting a square wave width of the square wave power supply in a power factor limiter; Further comprising the step of:
6. The method of claim 5, wherein exporting the generated output comprises:
And returns to the initial state when there is no comparator output of the next comparator.
A computer-readable recording medium recording a program for implementing the method of claim 5.

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