WO2020149480A1

WO2020149480A1 - Electric leakage circuit breaker using power gdt

Info

Publication number: WO2020149480A1
Application number: PCT/KR2019/009838
Authority: WO
Inventors: 류윤열
Original assignee: 아바윈 주식회사
Priority date: 2019-01-15
Filing date: 2019-08-07
Publication date: 2020-07-23
Also published as: KR102018107B1

Abstract

The present invention relates to an electric leakage circuit breaker using a power GDT and, more specifically, to an electric leakage circuit breaker using a power GDT, the electric leakage circuit breaker comprising: a varistor for firstly suppressing a surge when a surge current is input by being connected in series with the power GDT to prevent a short circuit of the electric leakage circuit breaker; a power GDT connected in series with the varistor, performing a discharge operation when an overvoltage is generated while being in an off state at normal times, and normally returning to an original state when a current becomes lower than an allowable current to thus have a magnetic restoration characteristic for secondly suppressing a surge impulse; a current CT for detecting a current value of a load side in real time to transfer the current value to a detection unit; an electric leakage detection ZCT for detecting a zero-phase current value of the load side in real time to transfer the zero-phase current value to the detection unit; the detection unit for detecting the current value and the zero-phase current value of the load side respectively from the current CT and the electric leakage detection ZCT in real time to transfer the current value and the zero-phase current value to a control board; and the control board for generating an alarm when a temperature sensor senses a temperature higher than or equal to a set value, and allowing data of the detection unit to be stored in a data storage unit.

Description

Earth leakage breaker using GDT for power

The present invention relates to an earth leakage breaker using a GDT for power, and more specifically, a varistor that is connected in series with the power GDT in order to prevent a short circuit of the earth leakage breaker and suppresses the surge when a surge current comes in; GDT for electric power having a self-recovery characteristic that is connected in series with the varistor, normally in an off state and then discharges when an overvoltage occurs, and returns to its normal state again when it is below the allowable current to suppress surge impulse secondaryly. ; A current CT that detects the current value on the load side in real time and delivers it to the detection unit; An earth leakage detection ZCT that detects the image current value on the load side in real time and delivers it to the detection unit; A detection unit which detects the current value and the image current value of the load side in real time from the current CT and the ground fault detection ZCT, and transmits them to the control board; It relates to an earth leakage breaker using a GDT for power including; a control board that generates an alarm when the temperature sensor reaches a temperature above a set value, and stores data in the detection unit in a data storage unit.

When fire accidents or disasters occur every year in all living spaces that use electric power, the cause is pointed to as a ground fault circuit breaker from electric fires, but the earth leakage breaker is replaced with a safe shut-off to treat it as functioning and find a secondary cause. The situation is urgent.

It was also difficult to physically and objectively identify the secondary cause as a short circuit and what caused the fire during that time.

For example, we have overlooked the major problems of the earth leakage breaker, which is the cause of fire accidents occurring near KRW 9 trillion per year, such as the recent fire incidents in the KT underground communication area, Jecheon Moktang Fire, Miryang Hospital Fire, Daegu Market Fire, and Incheon Soraepogu Fire. Because there is.

In addition, these days, immunity to brain surge voltage has been very low due to the application of semiconductors and integrated circuits to mobile communication information and communication equipment and power facilities, and the problem of reduced reliability and shortened lifespan has emerged as a hot topic in the field of short circuit breakers.

In general, effective methods for protecting electrical equipment from surges include a method of completely removing the source of an abnormal voltage, a method of increasing the withstand voltage, an electronic shielding method, an electrostatic shielding method, and a method of using a surge suppressor (varistor).

Among them, a method using a surge suppressor is widely used in the industrial field, but since the varistor, a core element inside the surge protector, is resistant, it gradually increases the leakage current according to the operation flow, acting as a obstacle to electric accidents and load power, and increasing leakage. As a result, there is a huge waste of power in power demand.

The earth leakage breaker is required by the KSC4613 standard to protect the life and property by blocking the earth leakage.

The earth leakage breaker used for household or industrial use does not have an earth leakage, but it is blocked by frequent earth leakage.

For example, if the small surge protector (varistor) element inside the circuit breaker exceeds the life limit, the resistance value increases and a short circuit occurs gradually, and in severe cases, the circuit breaker switch should be cut off. It may lead to fire (refer to the evidence of non-patent literature that has been tested).

If the device is deteriorated, the breaker cannot be operated, and industrial and household devices are exposed because they are not protected from lightning.

When the resistance value increases because it is connected in parallel to the circuit stage, it operates in a short structure, which leads to a fire if the breaker does not operate in the trip video current transformer.

Looking specifically, a conventional varistor (Zno) is a voltage suppression device having a function of suppressing discharge of the surge voltage by about 60% and inducing it to ground.

As the surge current is continuously applied, the voltage suppression element deteriorates and a resistive leakage current is generated.

The surge protection device operates in accordance with the threshold operating discharge voltage period, and the residual circuit breaker malfunctions due to the residual voltage (impulse noise) remaining.

When a surge protector is installed, it must be grounded, but leakage current is generated through the ground.

Conventional surge protector (SPD; varistor) is configured such that a system failure occurs due to leakage current, and a fuse or a power breaker is cut off when the leakage current increases.

However, an expensive surge protector is operated by replacing it within a set value period, and an expensive instrument is installed and monitored, but there is a problem in that it is impossible to completely check.

The conventional gas discharge tube (hereinafter referred to as GDT) is a switch-type surge protector having excellent self-recovery characteristics that normally operates in an off state and then discharges (on) when an overvoltage occurs, and returns to its original state again when it is below an allowable current.

The gas discharge tube has a characteristic that discharge is not completely extinguished as the discharge occurs at a value below the applied voltage as discharge occurs at the applied surge voltage and peak voltage, and thus is applied to a low-voltage high-frequency communication portion rather than a power circuit.

Therefore, the IEC standard expresses the fact that it cannot be applied to electric power due to the rapid current.

In addition, the earth leakage breaker used for home or industrial use does not have an earth leakage, but is blocked by frequent earth leakage.

This is because the resistance value increases when the small surge protector element in the circuit breaker exceeds the life limit, and a short circuit occurs gradually, and over time, it may lead to fire due to surrounding elements.

In reality, industrial and home devices are exposed because they are not protected from lightning.

In addition, when the resistance value increases because it is connected in parallel to the circuit stage, it operates in a short structure, which causes a problem that a breaker trips or severely leads to a fire (recent fires due to short circuit breakers in domestic building fire sites).

1 is a waveform graph showing the current flow in the gas discharge tube.

When discharge occurs in the gas discharge tube, the electrodes of the discharge tube are in a conducting state, and thus have a very low resistance value.

If the gas discharge tube is connected to an AC power line and used, if the arc discharge at both ends of the gas discharge tube is smaller than the peak value of the AC voltage after discharge occurs in the surge voltage, the discharge is not extinguished and the continuous current flows.

However, the home circuit breaker frequently trips due to a short circuit due to its own element in the rainy season lightning.

That is, when the varistor element used in the product increases the leakage current resistance due to lightning, and a self-leakage occurs, the breaker frequently trips.

This is because the circuit breaker trips because the lightning impulse cannot be completely erased and is recognized as a short circuit.

In addition, since the conventional earth leakage breaker does not have a lightning protection function, a separate lightning protector must be installed for industrial or system use.

Conventional inventions are designed to operate only with a legal reference value for short circuit and overload, so there is no precautionary measure and it is impossible to view the operation state of the earth leakage breaker in real time.

That is, when various power accidents occur because the state of the earth leakage breaker cannot be checked, there is a problem that the exact cause cannot be determined.

Therefore, there is a need for a new technology product that completely solves the surge voltage without generating load leakage current using the new power GDT.

The present invention has been devised to solve the above problems, and it is connected in series with a power GDT to prevent a short circuit breaker, and when a surge current comes in, the surge is primarily suppressed, and is normally off. Provides an earth leakage breaker using GDT for electric power with self-recovery that suppresses surge impulses by returning to normal when the overvoltage occurs and returning to the normal state (off) again. Have a purpose.

In addition, the present invention aims to provide a data storage unit having a fire prevention finish for carbon material and heat transfer shielding for the module part of the black box recorder capable of analyzing the cause by recording the change state of electricity in real time. have.

In addition, the present invention is applied to the display voltage, leakage current, the number of lightning impulse removal, checking the life of the surge element, displaying the current used, and applying a WiFi and Bluetooth module in the smartphone and home automation devices in the vicinity It has a purpose to control.

In order to solve the above problems, the present invention is connected to the GDT for electric power in series to prevent a short circuit in the circuit breaker. It is connected to the varistor in series, and it is normally in the off state, and when overvoltage occurs, it discharges, and when it is below the allowable current, it returns to its original state again and secondarily suppresses surge impulses. GDT; A current CT that detects the current value on the load side in real time and delivers it to the detection unit; An earth leakage detection ZCT that detects the image current value on the load side in real time and delivers it to the detection unit; A detection unit which detects the current value and the image current value of the load side in real time from the current CT and the ground fault detection ZCT, and transmits them to the control board; It includes; a control board for allowing the data of the detection unit to be stored in the data storage unit.

The present invention further includes a Bluetooth/Wi-Fi module or a home automation device, and the control board wirelessly transfers information of the data storage unit to the terminal of the manager.

The present invention further includes a temperature sensor that detects the ambient temperature of the earth leakage breaker and transfers it to the control board. The control board further generates an alarm when the temperature sensor reaches a temperature equal to or greater than a set value.

The present invention is a surge protection integrated circuit breaker that includes a digital analysis and protection function to block the occurrence of a short circuit, the current CT detecting the current value on the load side in real time and transmitting it to the detection unit; An earth leakage detection ZCT that detects the image current value on the load side in real time and delivers it to the detection unit; A detection unit which detects the current value and the image current value of the load side in real time from the current CT and the ground fault detection ZCT, and transmits them to the control board; A control board for controlling the data of the detection unit to be stored in the data storage unit; It includes a data storage unit under the control of the control board, the module unit having a fire prevention finishing configuration.

The data storage unit is made of a carbon material and a heat transfer shielding material in a fire-preventing finish so that the memory unit is not damaged and can be read separately even when a short circuit breaker is lost due to fire.

The exterior of the GDT for power is made of a ceramic material.

The present invention has a self-recovery characteristic that normally operates in an off state and then discharges when an overvoltage occurs, and returns to a normal state again when the current exceeds an allowable current, thereby suppressing surge impulses. GDT 22 for electric power; A current CT (11) that detects the load-side current value in real time and delivers it to the detector (31); An earth leakage detection ZCT (12) that detects the image current value on the load side in real time and delivers it to the detection unit (31); A detection unit 31 which detects the current value and the image current value of the load side in real time from the current CT 11 and the earth leakage detection ZCT 12, and delivers them to the control board 32 in real time; It includes; a control board 32 to allow the data of the detection unit 31 to be stored in the data storage unit 35.

The present invention made as described above is connected in series with the new GDT for power, so the surge is primarily suppressed when surge current comes in, so there is an effect that no leakage occurs in the circuit breaker body.

In addition, the present invention has a function of tripping the circuit breaker only when the circuit breaker is completely grounded by operating in a short circuit when the resistance value increases at the circuit stage even when impulse noise or the like is introduced.

In addition, the present invention operates only when a lightning or impulse flows without a rapid current with the function of a switch-type surge suppression device, and completely eliminates the lightning impulse with a GDT technology for electric power without a rapid current, and has an effect of not malfunctioning on signals other than a short circuit. have.

In addition, the present invention is attached to the power status monitoring data for 1 month (voltage, overvoltage, leakage current, overcurrent, surge (overvoltage)) SD micro memory, and an external display OLED (0.6”) so that the administrator can directly check the power status in the field. have,

In addition, the present invention is applied to the display voltage, leakage current, the number of lightning impulse removal, checking the life of the surge element, displaying the current used, and applying a WiFi and Bluetooth module in the smartphone and home automation devices in the vicinity It can be implemented to be controlled.

That is, it provides a technology to prevent electric power accidents in advance by making it possible to check the state of the earth leakage breaker all the time by wireless or wired.

In addition, according to the present invention, even when a short circuit breaker is lost due to a fire, the memory unit is composed of a carbon material and a heat transfer shielding finish, so that data on the power state is not damaged, and the cause of the fire can be analyzed and read separately.

The present invention detects the ambient temperature through the temperature sensor and delivers it to the control unit, and when the temperature exceeds the set value, an alarm is issued, and data is transmitted to the manager to facilitate management and operation.

1 is a waveform graph showing a rapid flow in a gas discharge tube according to a conventional invention.

2 is a view showing the overall configuration according to an embodiment of the present invention.

3 is a collection of data describing the problem that GDT that is currently sold according to an embodiment of the present invention cannot be applied (IEC 61643-12 2008-11)

4 is a view showing an impulse test value after (a) SGP circuit breaker impulse test and (b) 6KA impulse application according to an embodiment of the present invention.

5 is a table comparing the conventional invention with a surge protection integrated type earth leakage breaker that includes a digital analysis and protection function to block the occurrence of a short circuit according to an embodiment of the present invention.

6 is a view showing a configuration using only the power GDT according to an embodiment of the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This embodiment is provided to more fully describe the present invention to those skilled in the art. Therefore, the shape of the elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that in each drawing, the same members may be indicated by the same reference numerals. In addition, detailed descriptions of well-known functions and configurations that are judged to unnecessarily obscure the subject matter of the present invention are omitted.

2, the present invention is a varistor (21); GDT 22 for electric power; Temperature sensor 23; Current CT 11; Earth leakage detection ZCT (12); A detector 31; Control board 32; And the like.

The present invention further includes a Bluetooth/Wi-Fi module 34 or a home automation device, and the control board 32 can wirelessly transfer information from the data storage unit 35 to the manager's terminal.

In addition, the present invention further includes a temperature sensor 23 that detects the ambient temperature of the earth leakage breaker and transmits it to the control board 32, and the control board 32 alerts when the temperature sensor reaches a temperature equal to or higher than a set value. Occurs.

As shown in FIG. 3, (a) shows a varistor operating voltage characteristic when a surge voltage is applied, and (b) shows a GDT operating voltage characteristic in which a good limiting voltage appears when a surge voltage is applied, but a rapid current is high.

In addition, (c) using GDT for low-voltage high-frequency communication according to the IEC standard shows that surge protection is possible without leakage current, but it is only suitable for low-voltage high-frequency communication.

(d) According to the present invention, it shows that the short circuit is removed and the rapid current is removed using a surge protection integrated short circuit breaker with digital analysis and protection functions.

Therefore, it can be seen that, when the conventional GDT is used, the leakage current does not occur and the surge can be protected, but the IEC standard is suitable for low-voltage and high-frequency communication but cannot be used for the power surge.

The varistor 21 and the GDT 22 for power are voltage suppression elements that can be used in the surge portion for power, and are connected in a parallel structure to the circuit stage as shown in FIG. 3(d) to operate as a short structure when the resistance value increases. The circuit breaker trips only to a complete short circuit.

In addition, the varistor 21 is a voltage suppression element that is connected in series with the power GDT 22 in order to prevent a short circuit of the earth leakage circuit breaker and suppresses the surge when a surge current comes in.

The GDT 22 for power protects the internal gas with a ceramic material, and is connected in series with the varistor 21, and is normally turned off and discharged when an overvoltage occurs, and below an allowable current It is a voltage suppression element that has a self-recovery characteristic that suppresses surge impulses secondary to normal return (again, to an infinite resistance value) by returning to the original state (off) again.

When a surge current comes in series with the power GDT 22, the varistor responds first to suppress the surge and suppress the impulse in the power GDT secondarily, and the power GDT recovers back to an infinite resistance value.

Therefore, since the electrical connection is normally disconnected in the GDT for power, the varistor 21 does not deteriorate or short circuit.

When the small surge protector element in the conventional circuit breaker becomes above the life limit, the resistance value increases, and the phenomenon of short circuiting gradually disappears.

Thus, the problem of fire caused by shorting due to deterioration in the varistor of the conventional earth leakage breaker is solved, and power consumption is reduced and energy use is improved by preventing a short circuit.

The current CT 11 is an element that detects the current value on the load side in real time and delivers it to the detection unit 31.

The current value is detected in real time by the circuit breaker detector and transmitted to the control board for analysis.

The short circuit detection ZCT 12 detects the image current value on the load side by the circuit breaker detection unit and transmits it to the control board for analysis.

In addition, the ground fault detection ZCT 12 is a device that detects the image current value on the load side in real time and delivers it to the detection unit 31.

The detection unit 31 is a module that detects the current value and the image current value of the load side in real time from the current CT 11 and the earth leakage detection ZCT 12, and transmits them to the control board 32 in real time.

The control board 32 is a module that generates an alarm when the temperature sensor reaches a temperature equal to or higher than a set value, and allows the data of the detection unit 31 to be stored in the data storage unit 35.

The control board 32 analyzes the values sent from the earth leakage breaker detection unit 31 and the temperature sensor, processes the data and sends it to the storage unit and the display unit.

The control board 32 analyzes the following: (1) Load current analysis (overcurrent check), (2) Commercial voltage analysis (overvoltage check is also possible), (3) Leakage current analysis (alarm current data output when leakage current occurs) Looking at the leakage current, check the life of the varistor and GDT for power), (4) ambient temperature (heat) analysis, (5) power consumption, (6) power loss analysis, (7) control when the circuit breaker is suddenly cut off Since the cause of the instantaneous power failure is not known in the board 32, the charging circuit of the capacitor combination is configured to configure power to the control board until 2 seconds after the power failure.

Therefore, the analysis details may be recorded and submitted as analysis data for a fire fighting disaster.

A menu button is configured with the display unit 33 (eg, OLED 0.6”) so that the corresponding menu is displayed whenever the button is pressed.

When the menu button of the display unit 33 is not pressed, it is turned off, and each time it is pressed continuously, the first is the used voltage, the second is the used current, the third is the leakage current, and the fourth is the number of failures (leakage, surge overvoltage, Overcurrent, temperature), and the fifth can display power usage (monthly-check the power saving effect of the load). In addition, by looking at the leakage current, the life of the varistor and the GDT for power or the lightning impulse removal status (numerical display) may be displayed.

As another embodiment of the present invention, the current CT 11 that detects the load-side current value in real time and delivers it to the detection unit 31; An earth leakage detection ZCT (12) that detects the image current value on the load side in real time and delivers it to the detection unit (31); A detection unit 31 which detects the current value and the image current value of the load side in real time from the current CT 11 and the earth leakage detection ZCT 12, and delivers them to the control board 32 in real time; A control board 32 for controlling the data of the detection unit 31 to be stored in the data storage unit 35; It is controlled by the control board 32, and the module part includes a data storage unit 35 having a fire prevention finishing configuration.

The data storage unit 35 is a kind of black box and stores the state data of the earth leakage breaker made by the control board 32 from 1 month up to 1 year.

The storage memory is a micro SD memory card, and uses a module that can withstand high temperatures.

The memory of the storage section is composed of a carbon material and a heat transfer shielding material to finish the module so that it can be read without damage even when a short circuit breaker is lost due to fire.

The heat-transfer shielding material has a conductivity-reducing material that prevents heat from being transferred, and a radiation-shielding material that blocks radiant heat and prevents heat from being radiated inside, and metal, glass, and polymer series have low absorption or reflectance. It consists of one or more of these high metal foils, porous heat shield meshes.

The material for the heat transfer shielding is a reflective film made of an aluminum film attached to the top and bottom surfaces of a flame retardant heat insulating foam surrounded by a partition wall and a reflective film to form an air layer that acts as a heat barrier, and the air of the reflective film A thin layer of polyester (PET) resin is coated on the exposed surface to form a corrosion-resistant thin film coating layer.

Through the Bluetooth/WiFi module 34, an alarm of an earth leakage breaker is urgently transmitted to a person who has a smart phone or a terminal device in a fire or an abnormality, and the control board 32 is transmitted through a smartphone or a terminal device. It can be controlled remotely.

In addition, in order to prevent a power failure, when the details analyzed by the control board do not match the stored pattern information, sensor information and location are transmitted to the manager.

At this time, it is important for the manager to read, but by classifying the responsibilities of each manager, sequentially checking whether the manager of the terminal device is read or not. The location of the earth leakage breaker is transmitted to the final subordinate manager if the location of the earth leakage breaker is not read even if the location information of the earth leakage breaker is sequentially transmitted to the managers of each class.

Here, the ranking of responsibilities for each manager is ranked according to the weight of responsibility among the manager or a number of managers. Can.

In addition, the present invention can be controlled by linking the state of the earth leakage breaker in real time in connection with a home automation device for home use.

For example, in order to store the history list analyzed by the control board in the data storage unit 35 and manage it in one place, each list is transmitted to a home home automation device in a short-range communication method, and the home home automation device is Firefighting Disaster Prevention Analysis data of fire can be stored so that administrators can view it if necessary.

On the other hand, as shown in Figure 6 the present invention is a power GDT (22); Temperature sensor 23; Current CT 11; Earth leakage detection ZCT (12); A detector 31; Control board 32; And the like.

The present invention configured without the varistor 21 has the effect of completely removing the lightning impulse without rapid current with the GDT 22 for electric power made of ceramic material, and not malfunctioning in signals other than a short circuit.

Claims

A varistor 21 that is connected in series with the power GDT 22 in order to prevent a short circuit breaker, and primarily suppresses the surge when a surge current comes in;

It is connected in series with the varistor 21, and it is normally in an off state, but when an overvoltage occurs, it operates as a discharge, and when it is below an allowable current, it returns to its original state again and secondarily surge impulse. GDT (22) for power having a self-recovery property to suppress the;

A current CT (11) that detects the load-side current value in real time and delivers it to the detector (31);

An earth leakage detection ZCT (12) that detects the image current value on the load side in real time and delivers it to the detection unit (31);

A detection unit 31 which detects the current value and the image current value of the load side in real time from the current CT 11 and the earth leakage detection ZCT 12, and delivers them to the control board 32 in real time;

A control board 32 that allows the data of the detection unit 31 to be stored in the data storage unit 35;

The appearance of the power GDT is made of a ceramic material, and detects the ambient temperature of the earth leakage breaker and transmits it to the control board 32.

The control board 32 generates an alarm when the temperature sensor reaches a temperature equal to or higher than a set value, and configures a capacitor combination charging circuit so that power is applied to the control board until 2 seconds after a power failure.

The data storage unit 35 is made of a carbon material and a heat transfer shielding material with a fire prevention finish so that the memory unit is not damaged and can be read separately even when a short circuit breaker is lost due to a fire. Earth leakage breaker using GDT.
The method according to claim 1,

Further comprising a Bluetooth/Wi-Fi module 34 or a home automation device, the control board 32 utilizes a power GDT for wirelessly transmitting information from the data storage unit 35 to the manager's terminal. Earth leakage breaker.
In the integrated surge protection circuit breaker that blocks the occurrence of short circuit and includes digital analysis and protection function,

A current CT (11) that detects the load-side current value in real time and delivers it to the detector (31);

An earth leakage detection ZCT (12) that detects the image current value on the load side in real time and delivers it to the detection unit (31);

A detection unit 31 which detects the current value and the image current value of the load side in real time from the current CT 11 and the earth leakage detection ZCT 12, and delivers them to the control board 32 in real time;

A control board 32 that controls the data of the detection unit 31 to be stored in the data storage unit 35 and configures a capacitor combination charging circuit to supply power until 2 seconds after a power failure;

Controlled by the control board 32, the module portion includes a data storage unit 35 with a fire prevention finish configuration; includes,

The data storage unit 35 is made of a carbon material and a heat transfer shielding material with a fire prevention finish so that the memory unit is not damaged and can be read separately even when a short circuit breaker is lost due to a fire. Earth leakage breaker using GDT.