KR100285269B1 - Electric leakage detection system - Google Patents

Abstract

PURPOSE: An electric leakage detection system is provided to achieve an in-advance prevention against accident caused due to an electric leakage. CONSTITUTION: A system comprises an electric leakage information extraction unit(20) for extracting electric leakage information by obtaining a rectified difference voltage from the voltage difference between the detected voltage and the load voltage flowing at an electric facility; an electric leakage break set voltage varying unit(30) for varying the leakage breaking set voltage which serves as a reference value for determining whether to break electric leakage; an electric leakage break determination unit(40) for determining whether to break the power by generating an electric leakage break determination signal, when the rectified difference voltage is larger than the electric leakage break set voltage; a first electric leakage information display unit(50) for converting the electric leakage information and electric leakage break signal into a quantitative manner, and displaying the result; an electric leakage information transmitting unit(70) for transmitting the electric leakage information and electric leakage break set voltage over a communication unit; an electric leakage information receiving unit(80) for receiving output from the electric leakage information transmitting unit; and a second electric leakage information display unit(90) for displaying the output from the electric leakage information receiving in a quantitative manner.

Description

Earth leakage detection system

The present invention relates to a ground fault detection system, wherein a ground fault level and a reference set value of a ground fault current are notified by numerical values of electrical equipment and lines of each customer, and the ground fault is transmitted to the central monitoring station through a communication means. The present invention relates to an earth leakage detection blocking system for preventing fire and electric shock caused by fire early and controlling it remotely.

In general, the term "leakage" refers to leakage of an electrical signal in a circuit, a line, a device, or the like, as the term means. In general, the degree of leakage may be quantitatively represented by measuring a leakage current.

The leakage current is a current flowing through an insulated place, and in a normal state, the leakage current is very small, but increases due to a component flowing through the surface of dust, moisture, etc., and impurities or ions present in the insulation.

Devices to prevent this include a leakage alarm (leakage alarm), a leakage breaker (leakage breaker). In the short circuit fire alarm, the insulation deterioration of the insulation is the main cause of the short circuit, and in the case of low voltage, the insulation is carbonized by a leakage current of several 10 mA to several 100 mA, which is the stage of ignition, and thus several tens of current flows and ignites. An earth leakage fire alarm is a device which detects the phenomenon of the pre-ignition stage and makes an alarm. As described above, the ground fault fire alarm prevents fire due to a ground fault at the outer wall penetrating portion, and is distinguished from a ground fault breaker for the purpose of preventing electric shock.

That is, the ground fault breaker is a device that electrically cuts off the conduction state of the main power supply when the current and voltage flowing through the insulator exceed a predetermined value in order to prevent the electric current flowing through the insulator from causing an electric shock to humans or animals. .

The ground fault detection system according to the related art, which is constructed of the ground fault interrupting devices as described above, in order to detect the presence of a ground fault of an electrical facility, a person checks each facility and the line one by one, and in such a situation, only after an accident has occurred. Action was inevitable.

In addition, as the short-circuit detection system frequently operates as a follow-up measure after an accident has been damaged, the electrical equipment must be left in an unusable state until the circuit and the electrical equipment are restored. Due to the accident, there was a problem inevitably incurring casualties, loss of property, reduction in production and delays.

In particular, in the case of an integrated electric system having a large number of electrical equipments which are maintained at a long distance and separated from each other, a lot of efforts are required in terms of management by individually managing the electrical leakage state of each electrical equipment. .

Accordingly, the present invention has been made to solve such a problem, and by displaying a numerical value of the leakage level and the cutoff setting value to cut off the leakage current for the electric equipment and lines of each customer, the accident caused by the leakage The purpose of the present invention is to provide a ground fault detection system that can ensure safety by eliminating the cause of the ground fault before repairing it, repairing the facility, and establishing a countermeasure.

It is still another object of the present invention to provide a ground fault detection system capable of remotely and centrally managing a ground fault state by transmitting it to a central monitoring station through a communication means.

1 is a block diagram showing an embodiment of a ground fault detection system according to the present invention;

2 is a block diagram showing another embodiment of a ground fault detection system according to the present invention;

〈Description of the symbols for the main parts of the drawings〉

10: leakage circuit breaker 20: leakage information extraction unit

21: earth leakage detector 22: differential voltage amplifier

23: differential voltage rectifying section 30: cutoff voltage variable section

40: earth leakage blocking determination unit 50: first earth leakage information display unit

60: first cutoff alarm unit 70: earth leakage information transmitting unit

80: earth leakage information receiving unit 90: second earth leakage information display unit

100: second blocking alarm unit

In a ground fault detection system for achieving the object of the present invention, a ground fault detection system having a ground fault breaker for shutting off the power applied when the leakage current of the electrical equipment is detected:

The leakage voltage information is obtained by comparing the load voltage flowing through the electrical equipment with a predetermined detection set voltage on a path to which power is applied and determining whether there is an electric leakage. The current difference information is obtained by using the difference voltage between the detection set voltage and the load voltage. An earth leakage information extraction unit to extract;

An earth leakage cutoff determining unit determining a cutoff of the power supply by generating a cutoff determination signal when the rectified differential voltage is greater than a preset cutoff set voltage; And

And a first earth leakage information display unit configured to convert the earth leakage information and the earth leakage blocking signal into a displayable form and display the earth leakage information.

Here, the present invention preferably further includes a first cutoff alarm unit for alerting the short-circuit cutoff decision through an audiovisual alarm means when the cutoff determination signal is applied.

The present invention may further include a cutoff set voltage variable part which generates the cutoff set voltage, which is a reference value for determining whether a short circuit is cut off, and includes the cutoff set voltage in the short circuit information.

In addition, the present invention provides a leakage information transmitting unit for transmitting the leakage information and the cutoff determination signal through a communication means;

An electrical leak information receiver configured to receive an output of the electrical leak information transmitter; And

It is preferable that the second ground fault information receiving unit converts the output of the ground fault information receiving unit into a displayable form and displays it externally.

Here, the present invention preferably further includes a second cut-off alarm unit for alerting the short-circuit cut-off decision through an audiovisual alarm means when the cut-off decision signal is applied from the leakage information receiver.

Here, the ground fault information transmitting unit and the ground fault information receiving unit may be a wired modem using a communication line or a wireless modem using an aerial line.

In an aspect of the present invention, the earth leakage information extracting unit compares a load voltage flowing through an electric equipment with a preset detection setting voltage to detect an electric leak as the load voltage becomes smaller than the detection setting voltage to detect the electric leakage. An earth leakage detector for outputting a difference voltage from the voltage;

A differential voltage amplifier configured to amplify the differential voltage according to a predetermined gain and output an amplified differential voltage; And

It is preferable that the differential voltage rectifier is configured to rectify the amplified differential voltage and output a rectified differential voltage.

Hereinafter, an embodiment of a ground fault detection system according to the present invention will be described with reference to FIG. 1.

1 is a block diagram showing an embodiment of a ground fault detection system according to the present invention.

One embodiment of the ground fault detection system according to the present invention, as shown in Figure 1, in the ground fault detection system having a ground fault breaker (10) to cut off the power applied as the leakage current of the electrical equipment is detected:

The leakage voltage information is obtained by comparing the load voltage flowing through the electrical equipment with a predetermined detection set voltage on a path to which power is applied and determining whether there is an electric leakage. The current difference information is obtained by using the difference voltage between the detection set voltage and the load voltage. An earth leakage information extracting unit 20 to extract;

A cutoff setting voltage variable unit 30 variably generating the cutoff setting voltage, which is a reference value for determining whether a short circuit is cut off, and including the cutoff setting voltage in the leakage current information;

An earth leakage cutoff determining unit 40 determining a cutoff of the power supply by generating a cutoff determination signal as the rectified differential voltage is greater than a predetermined cutoff set voltage; And

A first earth leakage information display unit 50 for converting the earth leakage information and the earth leakage blocking signal into a displayable form and displaying the earth leakage information; And

And a first cutoff alarm unit 60 for alerting the short circuit cutoff decision through an audiovisual alarm means when the cutoff determination signal is applied.

Here, the ground fault information extracting unit 20 compares the load voltage flowing through the electrical equipment with a preset detection setting voltage and detects a short circuit as the load voltage becomes smaller than the detection setting voltage. An earth leakage detector 21 for outputting a differential voltage of?

A differential voltage amplifier 22 for amplifying the differential voltage according to a predetermined gain and outputting an amplified differential voltage; And

And a differential voltage rectifier 23 for rectifying the amplified differential voltage and outputting a rectified differential voltage.

The operation of one embodiment of the electrical leak detecting system according to the present invention configured as described above will be described in detail with reference to FIG. 1.

First, when power is applied, the leakage information extracting unit 20 compares the load voltage flowing through the electrical equipment with a preset detection setting voltage on the path to which the power is applied, and determines whether there is a leakage current according to the detection setting voltage and the load voltage. The leakage current information is extracted by obtaining a rectified differential voltage using a differential voltage of. The following description will be given in more detail.

First, the ground fault detecting unit 21 compares a load voltage flowing through an electrical equipment with a predetermined detection set voltage, detects a short circuit as the load voltage becomes smaller than the detection set voltage, and differentiates the detected set voltage from the load voltage. Output voltage.

In this case, when the detection set voltage is very small, the leakage current generated in such a negligible manner may be frequently detected, thereby causing confusion and fatigue to the leakage monitor. Accordingly, in order to eliminate such negative possession, it is necessary to provide the efficiency of earth leakage monitoring by giving an appropriate allowance. Therefore, it is well known that the detection set voltage should be an appropriate value that can reflect this fact.

Thereafter, the differential voltage amplifier 22 amplifies the differential voltage according to a predetermined gain and outputs an amplified differential voltage, and the differential voltage rectifier 23 rectifies the amplified differential voltage to output a rectified differential voltage. The reason for amplifying and rectifying the differential voltage is to provide convenience and accuracy in displaying the differential voltage or comparing the cutoff value with an operational amplifier.

On the other hand, when the cutoff setting voltage variable unit 30 variably generates the cutoff setting voltage, which is a reference value for determining whether the leakage current is cut off, the leakage current cutoff determining unit 40 generates the rectified differential voltage and the cutoff setting voltage. In comparison, when the rectified differential voltage is larger than the cutoff set voltage, a cutoff determination signal is generated to determine the cutoff of the power supply.

Accordingly, the earth leakage blocking unit 10 cuts off power, and the first blocking alarm unit 60 alerts the earth leakage blocking determination through an audiovisual alarm means as the blocking determination signal is applied.

In the above, the reason why the cutoff set voltage can be set variably is that the cutoff set voltage can be changed according to the situation, the environment, and the sensitivity of the electric leakage of the electric equipment, thereby giving more power to the leakage monitor. .

Meanwhile, the first ground fault information display unit 50 externally displays the rectified differential voltage output from the differential voltage rectifying unit 23 of the ground fault extracting unit 20, thereby causing a ground fault monitor to exceed the detection set voltage. The degree can be read quantitatively (or numerically). In this case, the first earth leakage information display unit 50 also displays the interruption setting voltage of the interruption setting voltage variable part 30 together with the earth leakage monitor. It notifies the criteria for blocking and additionally plays a role of predicting the time of leakage.

In addition, the first earth leakage information display unit 50 compares the rectified difference voltage with the cutoff setting voltage by the short circuit breaker determining unit 40 to generate a cutoff determination signal as the rectified difference voltage becomes greater than the cutoff set voltage. When it occurs, it converts the leakage of the leakage into a displayable form and displays it externally.

As a result, as a result of displaying the numerical value of the electric leakage level and the cutoff setting value to cut off the electric current of each customer's electrical equipment and lines, the cause of the electric leakage is eliminated before an electric leakage accident occurs. The safety of the facility can be maintained by establishing a countermeasure against it.

Hereinafter, another embodiment of the ground fault detection system according to the present invention will be described with reference to FIG. 2.

FIG. 2 is a block diagram showing another embodiment of the ground fault detection system according to the present invention, and includes an element overlapping with the embodiment of the ground fault detection system according to the present invention shown in FIG. For the sake of convenience, the same components have been given the same reference numerals.

Another embodiment of the ground fault detection system according to the present invention, as shown in Figure 2, in the ground fault detection system provided with a ground fault breaker (10) for shutting off the power applied as the leakage current of the electrical equipment is detected :

The leakage voltage information is obtained by comparing the load voltage flowing through the electrical equipment with a predetermined detection set voltage on a path to which power is applied and determining whether there is an electric leakage. The current difference information is obtained by using the difference voltage between the detection set voltage and the load voltage. An earth leakage information extracting unit 20 to extract;

A cutoff setting voltage variable unit 30 variably generating the cutoff setting voltage, which is a reference value for determining whether a short circuit is cut off, and including the cutoff setting voltage in the leakage current information;

An earth leakage cutoff determining unit 40 determining a cutoff of the power supply by generating a cutoff determination signal as the rectified differential voltage is greater than a predetermined cutoff set voltage; And

A first earth leakage information display unit 50 for converting the earth leakage information and the earth leakage blocking signal into a displayable form and displaying the earth leakage information;

A first blocking alarm unit (60) for alerting the earth leakage blocking determination through an audiovisual alarm means when the blocking determination signal is applied;

A leakage information transmitting unit (70) for transmitting the leakage information and the cutoff determination signal through a communication means;

A ground fault information receiver 80 for receiving an output of the ground fault information transmitter 70;

A second earth leakage information display unit 90 for converting the output of the earth leakage information receiving unit 70 into a displayable form and displaying it externally; And

And a second cutoff alarm unit 100 which alerts the cutoff cutoff decision through an audiovisual alarm means when the cutoff determination signal is applied from the ground fault information receiving unit 70.

Here, the ground fault information transmitter 70 and the ground fault information receiver 80 may be a wired modem using a communication line or a wireless modem using an aerial line.

In addition, the leakage information extracting unit 20 compares the load voltage flowing through the electrical equipment with a preset detection setting voltage and detects a short circuit as the load voltage becomes smaller than the detection setting voltage. An earth leakage detector 21 for outputting a differential voltage of?

A differential voltage amplifier 22 for amplifying the differential voltage according to a predetermined gain and outputting an amplified differential voltage; And

And a differential voltage rectifier 23 for rectifying the amplified differential voltage and outputting a rectified differential voltage.

The operation of another embodiment of the earth leakage detecting system according to the present invention configured as described above will be described in detail with reference to FIG. 2.

Another embodiment of the ground fault detection system according to the present invention includes components overlapping with the embodiment of the ground fault detection system according to the present invention as shown in FIG.

In other words, another embodiment of the ground fault detecting system according to the present invention may include a ground fault information transmitting unit 70, a ground fault information receiving unit 80, and a second ground fault information display unit 90 according to an embodiment of the ground fault detecting system according to the present invention. And according to the embodiment according to the present invention with the addition of the second blocking alarm unit 100 to the contents that are expected to be acceptable to those of ordinary skill in the art in order to exclude the redundant description as possible repeat description I will avoid it.

First, when power is applied, the leakage information extracting unit 20 compares the load voltage flowing through the electrical equipment with a preset detection setting voltage on the path to which the power is applied, and determines whether there is a leakage current according to the detection setting voltage and the load voltage. The rectified differential voltage is obtained by using the differential voltage of.

On the other hand, when the cutoff setting voltage variable unit 30 variably generates the cutoff setting voltage, which is a reference value for determining whether the leakage current is cut off, the leakage current cutoff determining unit 40 generates the rectified differential voltage and the cutoff setting voltage. In comparison, when the rectified differential voltage is larger than the cutoff set voltage, a cutoff determination signal is generated to determine the cutoff of the power supply.

Accordingly, the earth leakage blocking unit 10 cuts off power, and the first blocking alarm unit 60 alerts the earth leakage blocking determination through an audiovisual alarm means as the blocking determination signal is applied.

In the above, the reason why the cutoff set voltage can be set variably is that the cutoff set voltage can be changed according to the situation, the environment, and the sensitivity of the electric leakage of the electric equipment, thereby giving more power to the leakage monitor. .

Meanwhile, the first ground fault information display unit 50 externally displays the rectified differential voltage output from the differential voltage rectifying unit 23 of the ground fault extracting unit 20, thereby causing a ground fault monitor to exceed the detection set voltage. The degree can be read quantitatively (or numerically). In this case, the first earth leakage information display unit 50 also displays the interruption setting voltage of the interruption setting voltage variable part 30 together with the earth leakage monitor. It notifies the criteria for blocking and additionally plays a role of predicting the time of leakage.

In addition, the first earth leakage information display unit 50 compares the rectified difference voltage with the cutoff setting voltage by the short circuit breaker determining unit 40 to generate a cutoff determination signal as the rectified difference voltage becomes greater than the cutoff set voltage. When it occurs, it converts the leakage of the leakage into a displayable form and displays it externally.

On the other hand, as the above-described state of leakage and leakage information to the central monitoring station through the communication means can be managed in a remote, centralized manner, which will be described in more detail as follows.

The ground fault information transmitter 70 transmits the ground fault information and the cutoff determination signal through communication means, and the ground fault information receiver 80 receives the output of the ground fault information transmitter 70.

In this case, since the transmission line may be through either wired or wireless, an appropriate one may be selected according to an application field, a situation, and a management environment. Accordingly, the ground fault information transmitter 70 and the ground fault information receiver 80 may be selected. It is well known that may be a wired modem or a wireless modem.

The second ground fault information display unit 90 converts the output of the ground fault information receiver 70 into a displayable form and displays the cut-off decision signal from the ground fault information receiver 70. As a result of the alarm, the earth leakage blocking decision is alerted through an audiovisual alarm means.

Here, the second blocking alarm unit 100 and the second leakage information display unit 90 may serve as the first blocking alarm unit 50 and the first leakage information display unit 40 in terms of alarm and information display, respectively. same.

The display device may be a liquid crystal display (LCD), a display device using a light emitting diode (LED), a liquid crystal display (LCD), or a variety of displays such as a cathode ray tube (CRT). It is possible to apply the device and the like, and in particular, by outputting in the form of a document using a printer or the like, it is also possible to secure storage and record retention.

In the above-described embodiments of the present invention, the present invention has been described and exemplified mainly on detecting and blocking an electric leakage level and an electric leakage current, and displaying and warning an electric leakage state for each customer's electric facilities and lines and remote electric facilities. The present invention relates to a distribution board and an outlet circuit of a washing machine, a refrigerator, a hair dryer, an air conditioner, an electric stove, an electric cooker and the like, and a machine tool such as a hand drill, a lathe, a mill, and the like, which are in contact with a lot of people. It is well known that this also belongs to the claims of the present invention as it is easily applicable to other devices and appliances that use electricity as an energy source.

That is, the present invention can be expected to create a high technical ripple effect and economic benefits as it can be easily modified and applied irrespective of the weak or strong.

In addition, since the present invention has been described in the above embodiments, in view of the technical difficulty aspects of the present invention, a person having ordinary skill in the art can easily modify other embodiments and other embodiments of the present invention. As can be added, it is apparent that all embodiments and modifications cited in the above-described description and drawings belong to the claims of the present invention.

As described above in detail, a ground fault detection system having a ground fault breaker for shutting off power applied when a leakage current of an electrical equipment is detected: a load voltage flowing through the electrical equipment on a path to which power is applied and a predetermined detection A leakage information extracting unit configured to extract leakage information by obtaining a rectified differential voltage by using a difference voltage between the detection setting voltage and the load voltage as a result of comparing the set voltages to determine whether a short circuit occurs; An earth leakage cutoff determining unit determining a cutoff of the power supply by generating a cutoff determination signal when the rectified differential voltage is greater than a preset cutoff set voltage; And a first earth leakage information display unit for converting the earth leakage information and the earth leakage blocking signal into a displayable form and displaying the earth leakage information. The earth leakage detection system according to the present invention includes an electrical installation and a line of each customer and a remote location. Easily applied to distribution boards and outlet circuits of electrical appliances as well as electrical appliances, machine tools, and various electrical facilities, and devices and appliances that use electricity as an energy source. As it is displayed and notified, there is an advantage that safety can be ensured by removing the cause of the short circuit, repairing the corresponding equipment, and establishing a countermeasure before the accident occurs due to the short circuit.

In addition, there is an advantage that can be managed remotely and centrally as the short-circuit state is transmitted to the central monitoring station through a communication means.

Claims (5)

In a ground fault detection system having a ground fault breaker for shutting off an applied power supply when a leakage current of an electrical installation is detected: As a result of comparing the load voltage flowing through the electric equipment with the preset detection setting voltage on the path to which the power is applied, and determining whether an electric leakage occurs, the current leakage voltage is obtained by using the difference voltage between the detection setting voltage and the load voltage. A ground fault information extracting unit for extracting information; A cutoff setting voltage variable unit configured to variably generate a cutoff setting voltage for a reference value for testing whether the earth leakage is blocked; An earth leakage cutoff determining unit configured to determine whether the power is cut off by generating a cutoff determination signal as the rectified differential voltage becomes greater than the cutoff set voltage; A first earth leakage information display unit for quantitatively converting the earth leakage information and the earth leakage blocking signal and displaying them externally; An earth leakage information transmitting unit configured to transmit the earth leakage information and the cutoff setting voltage through a communication means; An electrical leak information receiver configured to receive an output of the electrical leak information transmitter; And And a second earth leakage information display unit configured to externally display the output of the earth leakage information receiver in a quantitative form. The earth leakage information extraction unit, A short circuit detecting unit configured to compare the load voltage with the detection set voltage, detect a progressive as the drop voltage grows above the detection set voltage, and output a long term detection set voltage and the difference voltage between the load voltage; A differential voltage amplifier for amplifying the differential voltage according to a predetermined gain and outputting an amplified differential voltage; And a differential voltage rectifier configured to rectify the amplified differential voltage and output the rectified differential voltage. The ground fault detection system according to claim 1, further comprising a first shutoff alarm unit for alerting the earth leakage cutoff decision through an audiovisual alarm means when the cutoff determination signal is applied. The earth leakage detection system according to claim 1, further comprising a second blocking path unit for alerting the earth leakage blocking determination through an audiovisual path means when the blocking determination signal is applied from the earth leakage information receiving unit. The ground fault detection system according to claim 1, wherein the ground fault information transmitter and the ground fault information receiver are wired modems using a communication line. The ground fault detection system according to claim 1, wherein the ground fault information transmitter and the ground fault information receiver are wireless modems using an aerial line.

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