KR20240054092A - EARTH LEAKAGE SAFETY SYSTEM CAPABLE OF IoT COMMUNICATION IN RAILWAY DISTRIBUTION BOARDS - Google Patents

Abstract

The earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention is a collection of branch overcurrent protectors installed in the railway field, and a fuse is installed closest to the load among the electric lines that supply electricity to the load through distribution lines. , a distribution panel in which branch overcurrent protectors that can block short-circuit currents, such as breakers, are collectively installed in a cabinet; An earth leakage safety protection device installed at the bottom of the power earth leakage breaker of the distribution board to shield and absorb leakage current, attenuate the leakage current to prevent it from being transmitted to people, and perform IoT communication; A ground fault current shield that maintains a normal grounding state before electricity flows in and collects leakage current and shields ground fault current by transforming the voltage and frequency signal into a constant voltage all-sine wave form in conjunction with the earth leakage safety protection device; A notification member that generates a notification when leakage current, voltage, or neutral line disconnection occurs; And an external device & server formed outside the distribution board and receiving leakage current generation information, leakage current shielding, absorption or attenuation information while communicating with the earth leakage safety protection device, and the earth leakage safety protection device is connected to the distribution board or outlet, etc. It has the effect of preventing human damage caused by leakage current by shielding, absorbing, and attenuating leakage current generated when using the corresponding distribution board or outlet, thereby preventing leakage current from being transmitted to people.

Description

Earth leakage safety system capable of IoT communication in railway distribution boards {EARTH LEAKAGE SAFETY SYSTEM CAPABLE OF IoT COMMUNICATION IN RAILWAY DISTRIBUTION BOARDS}

The present invention relates to an earth leakage safety system capable of IoT communication in a railway distribution board. More specifically, it is connected to a distribution board or outlet used for railways, and shields, absorbs, and attenuates leakage current to cause electric shock due to leakage current. This is about an earth leakage safety system capable of IoT communication in a railway distribution board that detects the amount of leakage current and transmits current leakage information to an external terminal through IoT communication while preventing accidents, so that dangerous situations can be quickly conveyed to managers. .

The nerves of our body also use weak currents, and due to the current flowing in, the signals sent from the brain are ignored, and if the electric shock current exceeds a certain level, it is impossible to escape the electric shock state on one's own. The maximum limit of this electric shock current is called the valence current, and in general It is about 6~9mA in frequency alternating current.

This is what happens when the electric current passes through the heart and is the most fatal.

Confusion in the heart's electrical system causes arrhythmia, and although it may appear normal on the outside, there is a risk of sudden death. In general, ventricular fibrillation caused by electric shock is the main cause of electrocution.

The conditions that determine electrocution include electrical conditions and human body conditions.

Factors include the size of the current, type of voltage, frequency, energization time, energization path, and electrical resistance contact area of the skin.

Among these, the most important factors are the magnitude of the applied current, the relationship between the time it takes and the path it takes. The larger the magnitude of the applied current and the longer the electric shock time, the closer the current path is formed near the heart, the higher the probability of death due to electric shock.

Generally, the size of electric shock current from commercial frequency alternating current that can lead to ventricular fibrillation is around 10mA to 15mA, but in the case of devices used directly connected to the heart, ventricular fibrillation can occur even with a small current of 10 mA.

The heart is unable to pulsate normally due to ventricular fibrillation current, and irregular fibrillation occurs, making blood circulation difficult and causing paralysis.

Republic of Korea Patent Publication No. 10-2212959 (2021.02.01)

In order to solve the above-described problems, the present invention connects an earth leakage safety protection device to a distribution board or outlet, shields and absorbs leakage current, and attenuates it to prevent leakage current from being transmitted to people. IoT communication in a railway distribution board is provided. The purpose is to provide a possible earth leakage safety system.

In addition, in order to solve the problems described above, the present invention is equipped with an IoT communication module in an earth leakage safety protection device that is connected to a distribution board or outlet, shields and absorbs leakage current, and attenuates the leakage current to prevent it from being transmitted to people. The purpose is to provide an earth leakage safety system that enables IoT communication in railway distribution panels that can quickly detect leakage current from the outside.

The earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention to achieve the above-mentioned purpose is a system installed by collecting branch overcurrent protectors in the railway field, and is installed in a line that supplies electricity to loads through distribution lines. , a distribution panel in which branch overcurrent protectors that can block short-circuit current, such as fuses and breakers, are installed in a cabinet closest to the load; An earth leakage safety protection device installed at the bottom of the power earth leakage breaker of the distribution board to shield and absorb leakage current, attenuate the leakage current to prevent it from being transmitted to people, and perform IoT communication; A ground fault current shield that maintains a normal grounding state before electricity flows in and collects leakage current and shields ground fault current by transforming the voltage and frequency signal into a constant voltage all-sine wave form in conjunction with the earth leakage safety protection device; A notification member that generates a notification when leakage current, voltage, or neutral line disconnection occurs; and an external device & server formed outside the distribution panel and receiving leakage current generation information, leakage current shielding, absorption or attenuation information while communicating with the earth leakage safety protection device.

The earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention is connected to a safety protection device for earth leakage in a distribution board or outlet, and shields, absorbs, and attenuates the leakage current generated when the distribution board or outlet is used, so that the leakage current is not transmitted to people. By preventing it from being transmitted, it has the effect of preventing human damage caused by leakage current.

In addition, the earth leakage safety system capable of IoT communication in the railway distribution board according to the present invention is equipped with an IoT communication module to shield and absorb the leakage current information detected by the earth leakage safety protection device connected to the distribution board or outlet, etc. , it has the effect of quickly transmitting attenuation information to a remote administrator terminal.

The earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention installs an earth leakage safety protection device to improve inequality of each phase, harmonic improvement effect, noise reduction effect, flicker phenomenon improvement effect, surge protection, power factor improvement effect, There is a reactive power improvement effect and a voltage compensation effect.

The earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention is effective in preventing electric shock accidents by installing earth leakage safety protection devices in parallel by utilizing existing electric lines as is, and by bypassing them in case of product failure. It has the effect of not affecting existing lines.

Figure 1 is a configuration diagram of an earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention.
Figure 2 is a diagram showing an earth leakage safety protection device and a ground fault current shield of an earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention.
Figure 3 is a diagram showing the connection state of the earth leakage safety protection device and the ground fault current shield of the earth leakage safety system capable of IoT communication in the railway distribution board according to the present invention.
Figure 4 is a diagram showing a notification member of an earth leakage safety system capable of IoT communication in a railway distribution panel according to the present invention and a state in which the notification member is installed.
Figure 5 is a wiring diagram in the case of grounding in a single-phase, two-wire type of an earth leakage safety system capable of IoT communication in a railway distribution panel according to the present invention.
Figure 6 is a wiring diagram in the case where there is no ground in the single-phase, two-wire type of the earth leakage safety system capable of IoT communication in the railway distribution panel according to the present invention.
Figure 7 is a diagram illustrating a method of installing a distribution board for an earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention.
Figure 8 is a wiring diagram in the case where there is no ground in the three-phase, four-wire type of the earth leakage safety system capable of IoT communication in the railway distribution board according to the present invention.
Figure 9 is a wiring diagram in the case of grounding in a three-phase, four-wire type of an earth leakage safety system capable of IoT communication in a railway distribution panel according to the present invention.

Terms or words used in this specification and claims should not be construed as limited to their common or dictionary meanings, and the inventor may appropriately define the concept of terms in order to explain his or her invention in the best way. Based on the principle that there is, it must be interpreted with a meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, so they can be replaced at the time of filing the present application. It should be understood that various equivalents and variations may exist.

Hereinafter, with reference to the attached drawings, an earth leakage safety system capable of IoT communication in a railway distribution panel according to the present invention will be described in detail.

The earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention includes a distribution board 100, an earth leakage safety protection device 200, and a ground fault current shield 300.

The distribution board 100 blocks overcurrent by installing a switch for each branch circuit at a point where the indoor wiring diverges from the main line to each branch circuit.

In particular, the distribution board 100 is a collection of branch overcurrent protectors installed in the railway field, and is installed at the point closest to the load, such as a fuse or breaker, among the electric lines that supply electricity to the load through distribution lines. Branch overcurrent protectors that can block are installed collectively in a cabinet, etc.

The distribution board 100 includes a power earth leakage breaker 110 (ELB<Electronic Leak Break>), which operates when the amount of current entering the earth leakage breaker and the amount of current leaving the earth leakage breaker are different. Block it.

The electric leakage current safety protection device (ECSPD) 200 is installed at the bottom of the power leakage circuit breaker 110 of the distribution board 100.

When the earth leakage safety protection device 200 is installed, the distribution board 100 generates a leakage current of 3 to 5 mA in conjunction with the earth leakage safety protection device 200 even when leakage current and voltage occurs or the neutral wire is disconnected. or when a leakage voltage of 30 to 48 V occurs, the LED lamp 410 of the notification member 400 blinks.

In addition, when a leakage current of 6.4 mA or a leakage voltage of 77 V occurs, the distribution board 100 rings the alarm 420 of the notification member 400 to inspect the line and prevent electric shock accidents. do.

Meanwhile, the leakage current and leakage voltage may vary slightly depending on site conditions.

As described above, when the earth leakage safety protection device 200 is installed on the distribution board 100 and a load is connected to the lower outlet of the electronic leak detector (ELD), the function automatically adjusts the highest phase even if the highest phase is incorrect. This can prevent electric shocks caused by short circuits that occur when the polarity is incorrect.

More specifically, the earth leakage safety protection device 200 is configured as shown in Figure 2a, and is installed in the distribution board 100 in which a MCCB (NFB: No Fuse Breaker) and an ELB are combined, or an MCCB (NFB) and a CB. It can be installed for load on the distribution board 100 combined with.

The specifications of the earth leakage safety protection device 200 are as shown in [Table 1] below.

product name AC earth leakage safety protection device (ECSPD) (single phase) Model EC-A-1000 (A Type or B Type) Specification (light current) *30A (AC 30A or less) * 100A (AC 100A or less) Capture and Attenuation *1~300mA * 1~500mA Voltage Allowable voltage: 80V~264V Power consumption 2W frequency 50HZ, 60HZ irrelevant, (110V/220V combined) installation * Installation distance: Within approximately 50cm from the distribution box.
Within approximately 50cm from the terminal power source
* A direct earth leakage safety protection device (ECSPD) is installed at the end loads (motor, equipment).
Install by attaching. (The closer the distance, the better.) main function * Prevents electric shock accidents by shielding, absorbing and attenuating leakage current
* Prevention of electrical fires caused by leakage current of earth leakage
* Prevents secondary electric shock accidents with the automatic detection of extreme leakage of the extreme leakage automatic detection device.
*Shield current (within about 100 mA) - (Prevention of electric shock and device protection)

addition
function

* Protect your device * Improvement of equality in each award (device protection)
* Harmonic improvement effect (device protection)
* Noise reduction effect (device protection)
* Flicker phenomenon improvement effect (device protection)
* Surge protection (protects internal devices) * efficiency improvement * Power factor and reactive power improvement effect (efficiency improvement)
* Voltage compensation effect (improved efficiency) caution The polarity must be adjusted before installation.
Select and install a product suitable for the installation purpose and location.

Meanwhile, the earth leakage safety protection device 200 has several functions, and the functions vary depending on the installation location.

The earth leakage safety protection device (200) installed in the distribution board where MCCB (NFB) + ELB is installed is installed as an A-Type product, and the earth leakage safety protection device (200) installed in the distribution board where MCCB (NFB) + CB is installed is It is installed as a B-Type product.

All functions of the A-Type earth leakage safety protection device 200 and the B-Type earth leakage safety protection device 200 are almost similar, but differ depending on whether ELB is installed, because the ELB interferes with the optimal automatic switching function.

The A-Type earth leakage safety protection device 200 is installed at the top of the power earth leakage breaker (110:ELB<Electronic Leak Break>) and at the bottom of the power earth leakage breaker (110:ELB<Electronic Leak Break>) of the distribution board 100. When installing the B-Type earth leakage safety protection device 200 on a load or other product, it is desirable to expect the highest automatic switching function.

Meanwhile, the ground fault current shield 300 is configured as shown in FIG. 2b, maintains a normal grounding state before electricity flows in, and is linked with the earth leakage safety protection device 200 as shown in FIG. 3. It is a multi-functional terminal block that collects leakage current and shields ground fault current by transforming the voltage and frequency signals into a constant voltage all-sine wave.

The specifications of the earth leakage safety protection device 300 are as shown in [Table 2] below.

product name Multi-functional resourceful current shielding device model name *GD-2000 * 220V only (110V ordered separately)
Role/Reason * Ground fault current shielding
* TN (TN-S, TN-C, TN-CS), TT, IT type integrated grounding role
* Ensure 100% utilization of the function of the earth leakage safety protection device (ECSPD). Grounding method * E1: TN-S grounding method
* E2: TN-C grounding method
[Change of binding of existing load grounding wiring to new grounding terminal]



ground wire
thickness * E1 and E2 can be connected according to the ground wire capacity.
* Ground wire thickness = breaker (rated current) capacity × 0.0496
Example) Breaker capacity 50A is 50×0.0496=2.48 (i.e. 4SQ)
Breaker capacity of 100A is 100×0.0496=4.96 (i.e. 6SQ)
Breaker capacity 250A is 250×0.0496=12.4 (i.e. 16SQ)
* Considering stability, use a grounding wire of one size larger than that calculated.
* A ground wire of appropriate thickness must be selected considering the protection level and function of the installation location.
* Comply with electrical equipment technical standards and extension regulations.

The earth leakage safety protection device 200 and the ground fault current shield 300 are connected as shown in FIG. 3.

That is, the earth leakage safety protection device 200 is formed with L contact, N contact, FG contact, and EPG contact, and the ground fault current shield 300 corresponds to the contact, N contact, FG contact, and EPG contact. A contact point is formed and connected to the earth leakage safety protection device 200.

The L contact point is a contact point to which a power line is connected, the N contact point is a contact point to which a neutral wire is connected, the FG contact point is a contact point to which a type 3 ground wire is connected, and the EPG contact point is a contact point to which a load enclosure is connected.

Meanwhile, the ground fault current shield 300 has the L contact, N contact, FG contact, and EPG contact formed on one side, and the first contact E1 and the second contact E2 are formed on the other side. .

The first contact point E1 and the second contact point E2 formed on the other side of the ground fault current shield 300 automatically become conductive when the earth leakage safety protection device 200 fails.

The first contact (E1) is a type 3 ground and has the function of blocking ground fault current within 100 mA and leakage current within 5 mA in the TN-S system.

The second contact point (E2) has a peak automatic detection and switching function in the TN-C system and can collect leakage current within 500mA.

The FG contact point is connected to a type 3 ground, and the EPG contact point is connected to a load enclosure to shield, absorb, and attenuate leakage current.

For reference, the TN-S (Terre Neutual-Separate) system is a method in which one point of the power-side system is grounded to the ground, and the protection wire of the exposed conductive part is separated from the neutral wire of the power-side system and connected to the power-side ground electrode.

The TN-C (Terre Neutual-Combined) system is a method of connecting directly to the ground at one point of the power supply side system, and the protection wire of the exposed conductive part is combined with the neutral wire of the power supply side and grounded.

The earth leakage safety protection device (200) is installed on the distribution panel (100), and the earth leakage safety protection device is applied to any part of the load side between the power line (L), neutral line (N), ground line (E1), and load ground line (E2). In shielding the leakage current through leakage attenuation and collection by (200), the distribution board (100) has an automatic detection function of the highest leakage due to contact with moisture or water due to each site environment, and the grounding wire (ground wire) in water, moisture, and air. When leakage and voltage occur in E1), when the neutral wire (N) is disconnected, or when the ground wire (E2) is disconnected, it is linked with the above-mentioned earth leakage safety protection device (200), and the LED lamp ( 410) blinks and an alarm sounds for a leakage current of 6.4mA and a voltage of 77V to warn of the risk of electric shock in advance.

The blinking of the LED lamp 410 and the operation of the alarm 420 occur when leakage occurs, voltage occurs, disconnection of the neutral wire, disconnection of the ground wire connected to the second contact point E2, moisture on the load side, or contact with water.

As described above, the LED lamp 410 and the alarm 420 of the notification member 400 operate according to leakage current and voltage as shown in [Table 3] below.

Leakage amount (mA) 3~5mA 6.4 8.6 13.8 16.2 18.2 Voltage (ACV) 30~48V 77 103 157 195 220 Lamp (●) ● ● ● ● ● ● Alarm (◎) - ◎ ◎ ◎ ◎ ◎

The notification member 400 is connected to the earth leakage safety protection device 200 and the GD-2000 jack inside the distribution board 100 as shown in FIG. 4A and is installed outside the distribution board 100 as shown in FIG. 4B. do.

Detailed specifications for the notification member 400 are as shown in [Table 4] below.

product name Automatic alarm function in case of extreme leakage and voltage model name * EP-1004 Voltage range * 220V/110V combined
Role/Reason After installing an earth leakage safety protection device (ECSPD<A Type>) in the distribution panel, it is linked with the earth leakage safety protection device when voltage and leakage current occur.
1. LED lamp blinks when leakage current is 3~5mA and voltage is 30~48V.
2. Alarm sound function when leakage current is 6.4ma and voltage is 77V

Checking list 1. Be sure to check the relevant line when the LED lamp and alarm are activated.
2. An electric leakage safety protection device (ECSPD<B Type>) must be additionally installed on the lower line of the Hading Power Earth Leakage Circuit Breaker (ELB) to prevent electric shock. After installation, check whether the LED lamp blinks and an alarm sounds.
(Safe if the LED lamp blinks and the alarm does not work after taking action)

Below, the installation method of the earth leakage safety protection device 200 of A-Type or B-Type will be described.

One earth leakage safety protection device 200 may be installed in the case of a single-phase 2-wire type, and 3 may be installed in the case of a 3-phase 4-wire type depending on the internal shape of the distribution panel 100.

More specifically, when there is grounding in a single-phase two-wire type, as shown in Figure 5, the existing load grounding or wiring for the output side (E2) on the distribution panel side is changed to a TN-C type grounding with a new grounding terminal block, and the input side is connected to a new grounding terminal block. Connect the wiring for (E1) to the distribution board so that TN (TN-S, TN-C), TT, and IT are grounded.

On the other hand, in a single-phase two-wire type, the load ground on the input side (E1) is TN (TN-S, TN-C), TT, and IT ground, and the load ground on the output side (E2) is TN-C type ground.

In addition, in the case of a single-phase two-wire type, the input side (E1) is not grounded, as shown in FIG. 6, the wiring for the existing output side (E2) can be connected directly to the distribution board 100, or connected to an external frame with TN-C type grounding. Connect directly to

In the case where there is a ground when installing the distribution panel 100 in a 3-phase 4-wire system, as shown in FIG. 7, it is connected to the ground bar of the 3-type ground (E3) grounded in the TN-S method of the distribution board 100 and each phase of the three phases. The input side (E1) of the ground fault current switch 300 is connected and grounded.

In addition, the output side (E2) corresponding to the load ground of the ground fault current shield (300) must be installed to be insulated from the distribution board (100).

That is, in the present invention, the input side (E1) of the ground fault current switch 300 is left as is, and the output side (E2) is used as a terminal block grounded in the TN-C method with only the ground terminal insulated.

At this time, the input side (E1) performs a ground fault current blocking function and is mounted inside the earth leakage safety protection device (200).

When the earth leakage safety protection device 200 fails, the power is automatically turned off, and the input side (E1) and the output side (E2) are automatically connected and conductive.

Meanwhile, a No Fuse Breaker (NFB) is installed between the distribution board and the earth leakage safety protection device 200.

The earth leakage safety system capable of IoT communication in a railway distribution board according to the present invention connects the earth leakage safety protection device 200 and the ground fault current capper 300 to the system, and provides a grounding bar to prevent leakage by grounding as described above. Electric shock accidents can be prevented through current shielding, absorption, and attenuation.

If there is a ground when installing the distribution panel 100 in a 3-phase 4-wire type, the wiring structure when connecting the load is as shown in FIG. 8.

When there is no ground when installing the distribution board 100 in a 3-phase 4-wire type, as in the case where there is a ground as shown in FIG. 9, the output side (E2) corresponding to the load ground of the ground fault current shield 300 is the above. Be sure to install it insulated from the distribution board (100).

In other words, the existing input side (E1) is left as is, and only the ground terminal is used as an insulated terminal block on the output side (E2).

In particular, in the case of delta (△) connection, a terminal block must be installed. Because if the output side (E2) of each phase is not connected to the terminal block, unbalance may occur and a terminal block must be installed due to the possibility of ground fault current.

When the R, S, T, and N phases of the distribution board 100 are connected to the load, each of the R, S, and T phases is connected to the ground fault current shield 300 and the earth leakage safety protection device 200, The ground output side of the load and the output side (E2) of the ground fault current shield 300 are connected.

Meanwhile, the IoT communication module 210 connected to the distribution board 100 described above is installed in the earth leakage safety protection device 200 and transmits leakage current generation information and corresponding leakage current shielding, absorption and attenuation information to external devices & servers ( 500) through IoT communication.

For reference, the external device & server 500 may correspond to a mobile phone, a tablet PC, a control server that monitors a distribution board, etc.

The IoT communication module 210 provides LoRa (Low Range Wide Area Network) communication with a coverage of about 11Km, a frequency band of 8~900MHz~500KHz, and a communication speed of ~100bps, as described in [Table 1] below, and a communication speed of about 11Km. The earth leakage safety protection device 200 using LTE-M communication with coverage of 1.4MHz LTE frequency band and ~1Mbps communication speed, or NB-IOT communication with coverage of about 15Km, 200KHz LTE frequency band, and ~150Kbps communication speed. Deliver information collected from

IOT communication technology LoRa LTE-M NB-IOT Communication range ~11km ~11km ~15km frequency band 8~900MHz
~500KHz LTE frequency 1.4MHz ~150Kbps communication speed ~10kps ~1Mbps ~150Kbps Roaming NO YES YES battery life ~10 years ~10 years ~10 years

That is, the IoT communication module 210 is equipped with a communication mode selection unit (not shown) to selectively select one of LoRa (Low Range Wide Area Network) communication, LTE-M communication, or NB-IOT communication depending on the type of surrounding communication network. Select communication to communicate with the external device & server 500.

In the above, the technical idea of the present invention has been described along with the accompanying drawings, but this is an exemplary description of a preferred embodiment of the present invention and does not limit the present invention. In addition, it is clear that anyone skilled in the art of the present invention can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

100: Distribution board
110: Power earth leakage breaker
200: Earth leakage safety protection device
210: IoT communication module
300: Ground fault current shield
400: Absence of notification
410: LED lamp
420: Alarm
500: External device & server

Claims (8)

In the railway field, branch overcurrent protectors are collectively installed, and branch overcurrent protectors that can block short-circuit currents, such as fuses and breakers, that can block short-circuit currents, such as fuses and breakers, are installed in a cabinet closest to the load among the electric lines that supply electricity to loads through distribution lines. Installed distribution board;
An earth leakage safety protection device installed at the bottom of the power earth leakage breaker of the distribution board to shield and absorb leakage current, attenuate the leakage current to prevent it from being transmitted to people, and perform IoT communication;
A ground fault current shield that maintains a normal grounding state before electricity flows in and collects leakage current and shields ground fault current by transforming the voltage and frequency signal into a constant voltage all-sine wave form in conjunction with the earth leakage safety protection device;
A notification member that generates a notification when leakage current, voltage, or neutral line disconnection occurs; and
IoT communication in a railway distribution panel is characterized by comprising an external device & server formed outside the distribution board and receiving leakage current generation information, leakage current shielding, absorption or attenuation information while communicating with the earth leakage safety protection device. Possible earth leakage safety system.
According to clause 1,
The earth leakage safety protection device is
IoT communication in a railway distribution panel, characterized in that it includes an IoT communication module that is connected to the distribution board and transmits leakage current generation information and corresponding leakage current shielding, absorption, and attenuation information to the external device & server through IoT communication. This is a possible earth leakage safety system.
According to clause 2,
The IoT communication module is
The communication mode selector selectively selects any one of LoRa (Low Range Wide Area Network) communication, LTE-M communication, or NB-IOT communication depending on the type of surrounding communication network to communicate with the external device & server. An earth leakage safety system capable of IoT communication in a railway distribution board.
According to clause 1,
The earth leakage safety protection device is
An earth leakage safety system capable of IoT communication in a railway distribution panel, characterized in that one unit is installed in the case of a single-phase, two-wire system and three units are installed in the case of a three-phase, four-wire system, depending on the internal shape of the distribution panel.
According to clause 4,
The earth leakage safety protection device is
In the case of a single-phase, two-wire type, the wiring for the existing load ground or output side (E2) is changed to a TN-C type grounding on the distribution panel side to a new ground terminal block, and the wiring for the input side (E1) is connected to the distribution panel. It is connected so that TN (TN-S, TN-C), TT, and IT are grounded, but in the single-phase 2-wire type, the load ground on the input side (E1) for the load side is TN (TN-S, TN-C), TT, and IT ground. , An earth leakage safety system capable of IoT communication in a railway distribution panel, characterized in that the load grounding on the output side (E2) is TN-C type grounding.
According to clause 4,
The earth leakage safety protection device is
In the case where there is no ground, in a single-phase, two-wire type, the input side (E1) is connected directly to the existing output side (E2) to the distribution board, or in a railroad distribution board characterized in that it is directly connected to an external frame with TN-C type grounding. Earth leakage safety system capable of IoT communication.
According to clause 4,
The earth leakage safety protection device is
In a 3-phase 4-wire system, if there is a ground when installing the distribution panel, connect the ground bar of the 3-type ground (E3) grounded in the TN-S method of the distribution board and the input side (E1) of the ground fault current switch connected to each phase of the 3 phases. An earth leakage safety system capable of IoT communication in a railway distribution panel, characterized in that the output side (E2) corresponding to the load ground of the ground fault current shield is installed to be insulated from the distribution board.
According to clause 4,
The earth leakage safety protection device is
If there is no ground when installing the distribution board in a 3-phase 4-wire type, the output side (E2) corresponding to the load ground of the ground fault current shield is installed insulated from the distribution board, but the existing input side (E1) is left as is, and the output side ( An earth leakage safety system capable of IoT communication in a railway distribution board, characterized in that only the ground terminal of E2) is used as an insulated terminal block.