TW202137662A - Apparatus for prevention of electric leakage in event of flooding for fire prevention and safety and method for protection against electric leakage and electric shock using same - Google Patents

Abstract

The present invention relates to an apparatus for prevention of electric leakage in the event of flooding for fire prevention and safety, and a method for protection against electric leakage and electric shock using same. More particularly, the present invention relates to an apparatus for prevention of electric leakage in the event of flooding for fire prevention and safety, which has a line blocking function and the like due to a short circuit during flooding so as to secure safety in the event of electric leakage if the short circuit occurs due to a connection failure of an input line or an electric line is flooded due to an accident such as rain and the like, and a method for protection against electric leakage and electric shock using same.

Description

Anti-leakage device applied to fire and water immersion, and anti-leakage and anti-shock method using the device

The present invention relates to an electric leakage prevention device applied to fire and water immersion and an electric leakage prevention and electric shock prevention method using the device, especially when a short circuit is caused by incorrect connection of an input wire, or a wire is immersed in rainwater to cause a short circuit. An anti-leakage device and an anti-electric shock method that can effectively prevent safety problems caused by leakage.

In many countries, the protection method adopted by the household electrical system is to connect one phase of the single phase to the neutral line, and the potential of the neutral line is the same as the potential of the ground terminal.

Although this method can bring very high economic benefits, it is relatively difficult to find the point of the problem when a fault occurs on the ground terminal.

For example, Korean Laid-open Patent Publication No. 10-2005-0037986 is a water leakage prevention device that can prevent leakage accidents and electric shock accidents. It describes that when electrical equipment or electrical devices are immersed in water during the energization process, the water leakage prevention device The device will absorb the leakage current from the charging part, and achieve the effect of preventing fire or electric shock accidents. A variety of related embodiments are cited in this patent to illustrate the water immersion anti-leakage device, and these embodiments all include a large number of exposed connection terminals (single-phase connection terminal P, neutral point terminal N, ground terminal E), configuration of the A terminal block for most connection terminals, a flat metal plate covering all other devices such as circuit breakers and current locks. Wherein, the flat metal plate is electrically connected to the neutral point terminal (N) or the ground terminal (E). Devices such as the connection terminal block, circuit breaker, and current lock are installed on the upper part of the flat metal plate. According to the technical description in this patent, even if the connection terminals exposed on the connection terminal block are immersed in water, the flat metal plate absorbs the current flowing from the charging part, so the current intensity flowing to the human body becomes Very weak, in order to obtain the anti-leakage effect.

In addition, Korean Registered Patent No. 1197414 is a water leakage prevention device that can prevent leakage and electric shock accidents. It includes an input terminal portion including a first input terminal (IN1) and a second input terminal (IN2). ), ground terminal (G); an output terminal portion, the output terminal portion includes a first output terminal (OUT1), a second output terminal (OUT2); a terminal polarity fixing portion, the terminal polarity fixing portion is arranged on the input Between the terminal and the output terminal. To connect the first input terminal and the second input terminal (IN1, IN2) to the phase voltage terminal (R) and neutral point terminal (N) of the AC power socket, the following methods can be used. (i) While connecting the first input terminal (IN1) to the phase voltage terminal (R), connect the second input terminal (IN2) to the neutral terminal (N), (ii) or vice versa If the first input terminal (IN1) is connected to the neutral point terminal (N), the second input terminal (IN2) is connected to the phase voltage terminal (R), or the second input terminal ( IN2) may not be connected. In addition, while the first output terminal (OUT1) is electrically connected to the neutral point terminal (N), the second output terminal (OUT2) is electrically connected to the phase voltage terminal ( R); A connection terminal block, the connection terminal block includes a body, a first connection terminal (J1), a second connection terminal (J2), wherein the body is made of an insulator. The first connection terminal (J1) and the second connection terminal (J2) are arranged on the upper surface of the body at a certain interval, and the first connection terminal (J1) and the second connection terminal (J2) will output the first The terminal (OUT1) and the second output terminal (OUT2) are electrically connected to the load; an anti-leakage conductor, the anti-leakage conductor is arranged around the second connection terminal (J2). The phase voltage terminal (R) is connected to the second connection terminal (J2), and the neutral point terminal (N) is electrically connected to the first connection terminal (J1). In addition, the leakage prevention conductor may cover a part of the side of the connection terminal block, a part of the upper part of the connection terminal block, or a part of the side and upper part of the connection terminal block. When the connection terminal block is immersed in water, the current flowing from the second connection terminal (J2) will flow into the leakage prevention conductor, so the current intensity can be reduced to a level that does not cause electric shock to the human body. Can achieve anti-leakage or anti-shock effect.

However, in addition to its complicated structure, such a prior circuit system cannot effectively achieve the effect of preventing electric leakage or electric shock every time.

In addition, ground faults often bring fire and electric shock hazards, so they need to be sensed and isolated in advance.

For this reason, a leakage current circuit breaker is usually installed on the distribution board of a building or home. When a leakage current exceeding the specified range occurs, the overall power supply system can be cut off.

However, in fact, the leakage current within the above range may still cause accidents such as fire or electric shock to the human body, so additional appropriate preventive measures are required.

In addition, when the leakage current circuit breaker turns off the power supply of the entire circuit, in addition to causing inconvenience to the user, it is also difficult to find the location of the fault.

In order to solve the aforementioned problems, the present invention provides a method that can distinguish between normal current and leakage current while controlling the intensity of the leakage current within a standard range.

Furthermore, in the problems and improvements of the previous invention, the socket products that are usually exposed to the outside are more likely to be contaminated by dust or foreign objects, so it is easy to cause problems such as deterioration of the insulation effect between the terminals and increase of leakage current. Therefore, it is necessary to monitor the status of the socket at any time and take appropriate countermeasures.

In addition, electrical appliances connected to sockets often have grounding accidents. Although such grounding accidents come from the defective or old electrical appliances themselves, they sometimes become the cause of fire or electric shock accidents. Therefore, it is necessary to pre-detect and take appropriate corresponding measures in order to protect precious lives and property.

In addition, in order to achieve maximum safety and efficiency, after distinguishing leakage current and electric shock current, different response measures can be provided according to the form of the distinguished current.

In addition, since a weak leakage current is often generated in normal electrical equipment, the detection circuit must be set to a leakage current that exceeds the dangerous value before it starts to operate.

When a leakage current above this dangerous value occurs, the protective device must be activated to reduce the leakage current below the safe value range.

In addition, even if the leakage current is reduced below the safe value range, the safety mechanism must be activated to prevent the leakage current of the circuit from returning to its original state.

However, so far, no device with the aforementioned effects has been developed on the market, so it is necessary to strengthen related research and development in related fields.

In view of the above-mentioned shortcomings of conventional leakage prevention devices, the inventor researched and improved ways to address these shortcomings, and finally came up with the present invention.

The main purpose of the present invention is to provide an anti-leakage device applied to fire and flooding, which mainly uses a detection part and a detection part of the control part to confirm whether the connection state of the R phase and the N phase is correct, and the detection part and the control part The control unit can control the intensity of the leakage current to counteract the intensity of the leakage current, so as to prevent the fire and safety problems caused by the leakage when the input wire is connected incorrectly and causes a short circuit, or the wire is immersed in rainwater to cause a short circuit.

Another object of the present invention is to provide an anti-leakage device for fire and flooding, which distinguishes the R-phase and the neutral N-phase through a voltage detection circuit in a detection section and a control section, and then through a current comparator ( CT) detection of dangerous leakage current function, and then through the grounding relay or three-way switch (3WAY SWITCH) to correctly connect the R-phase and the neutral line N-phase to the grounding wire, so as to achieve the effect of electric shock cancellation.

Another object of the present invention is to provide an anti-leakage device for fire and flooding, which detects leakage current through a current comparator (CT). When the value of the leakage current increases rapidly, an external leakage circuit breaker will be activated Carry out the overall power-off operation.

In order to achieve the above objectives and effects, the technical means adopted by the present invention include: an anti-leakage device for fire and flooding, which includes: a detection part and a control part, and the detection part of the detection part and the control part can confirm R Whether the connection state of phase and N phase is correct, the detection part and the control part of the control part can control and offset the intensity of the leakage current; a grounding part, after distinguishing the R phase and the N phase, connect the N phase to the ground (G ); an electric shock cancellation part, which can reduce the dangerous intensity caused by leakage current to the human body by canceling the magnetic flux; an alarm part and monitoring part, the alarm part of the alarm part and the monitoring part can display the detection part and the control part and the electric shock cancellation When the detected value exceeds a certain range, the alarm unit can send out related alarm signals; the alarm unit and the monitoring unit of the monitoring unit can monitor the current after the detection and electric shock cancellation operations are completed. state.

According to the above structure, the grounding part is connected to the ground through the relay 3 (RY3, RY4) and one of the three-way switch SW3.

According to the above structure, the alarm unit and the monitoring unit (500) are provided with a display lamp and a horn that can perform an alarm function.

According to the above structure, the electric shock cancellation part can detect the leakage current through a current transformer (CT), and close the current according to the leakage current.

According to the above structure, when the value of the leakage current exceeds a certain range, the electric shock canceling part activates the SW to cut off the entire power supply.

According to the above structure, the detection part and the control part include a voltage detection circuit that can distinguish between R phase and neutral line N phase, and detect leakage current through a current transformer (CT); and an electric shock cancellation part, The electric shock cancellation part can cancel the electric shock hazard through the circuit breaker according to the leakage current.

According to the above structure, the voltage detection circuit of the detection part and the control part will not generate a warning (light) when it detects that the R phase and the neutral line N phase are connected to the correct ground position; but on the contrary, if it is connected to the When the grounding position is correct, a warning (light) will be generated, indicating that the connection status is abnormal. In addition, a warning voice message can also be issued to remind the operator to reconnect the terminals to achieve the function of preventing fire and electric shock.

According to the above structure, when the current comparator (CT) of the detection part detects the leakage current, it will cut off SW2 to perform the electric shock cancellation operation through the electric shock cancellation part; when the leakage current value exceeds a certain range, it will Restart SW1 to cut off the entire power supply.

The technical means adopted in the present invention further include: an electric shock prevention method using the above-mentioned leakage prevention device; it mainly includes the following stages: a leakage current is detected through the current comparator in the detection part and the control part, and the R phase and the middle phase are displayed. The phase of the connection state of the N-phase of the neutral line; a phase in which the leakage current is cut off by a circuit breaker; and the phase in which an electric shock is cancelled by the electric shock cancellation part according to the leakage current.

According to the above method, the detection part and the control part distinguish the R phase and the neutral line N phase through the voltage detection circuit. If the R phase and the neutral line N phase are connected to the correct ground position, no warning (lights) will be generated. ), but on the contrary, if it is connected to an incorrect ground position, a warning (light) will be generated, indicating that the connection status is abnormal; in addition, it also includes a voice message to inform the operator to re-adjust the connection of the terminal and the ground The stage of the position.

According to the above method, when the current ratio device in the detection part and the control part detects the leakage current, the disconnection part cuts off the switch (SW2) to perform the electric shock cancellation stage through the electric shock cancellation part.

In order to obtain a more detailed understanding of the above-mentioned objects, effects and features of the present invention, the following descriptions are given with reference to the following drawings:

In order to enable the reviewer to have a further understanding and recognition of the features and characteristics of the present invention, the following preferred embodiments are illustrated in conjunction with the drawings as follows. The following description of the present invention only provides preferred embodiments, and is not intended to limit the scope of implementation of this creation. All the equivalent changes made by those skilled in the art based on the present invention should fall within the scope of this creation. . Therefore, in order to more clearly illustrate the features and characteristics of the present invention, the shapes of related elements can be emphasized or expanded in the related drawings. In each drawing, the same symbols are used to indicate the materials of the same parts. In addition, with regard to other unnecessary components that the applicant believes may cause blurring of the focus of the present invention, no specific description will be made.

Please refer to Figure 1, when the power terminal A1 of a transformer A (Transformer) steps down the external three-phase (U-phase, V-phase, W-phase) high voltage into the three-phase (R-phase, S-phase) of the load terminal A2 , T phase) low voltage and a neutral line N phase, one of the R phase (or S phase, T phase) and the neutral line N phase can be combined into a single-phase power supply commonly used in general households, this single-phase power supply It is connected to the socket C via a single-pole (1 POLE) leakage circuit breaker B, and the leakage prevention device D of the present invention is mainly arranged between the socket C and the electrical appliance E powered by the socket C.

The present invention is an anti-leakage device for water immersion. The anti-leakage device for water immersion has the function of sending out an alarm message when the neutral line and the phase terminal are connected in the wrong position during the terminal connection operation, so that the operator can adjust the correct position. Location function.

The present invention provides an anti-leakage device for water immersion, which includes a detection part and a control part (200), which can confirm whether the R phase and the N phase are connected correctly; a ground part (215), which can first distinguish the R phase and the N phase After that, connect the N phase to the ground (G); an electric shock cancellation part (400), which can reduce the current intensity that is dangerous to the human body; an alarm part and a monitoring part (500), which can display the detection part and the control part (200) ) And the load state or current state of the electric shock cancellation unit (400), and when the detected value exceeds a certain range or more, the alarm unit and the monitoring unit (500) will issue related alarm signals.

More specifically, as shown in Figures 2 to 5, the leakage prevention device D of the present invention includes: a detection unit and a control unit (200), an alarm unit and a monitoring unit (500), and a grounding unit (215) connected in sequence. ) And the electric shock cancellation part (400), and after the electric shock cancellation part (400) is connected an internal socket C1 that can provide the power required by the electrical appliance E; wherein the detection part of the detection part and the control part (200) It can be confirmed whether the connection state of the R phase and the N phase is correct, and the control part of the detection part and the control part (200) can control the intensity of the leakage current to be offset.

The grounding part (215) can first distinguish the R-phase and the N-phase, and then connect the N-phase to the ground (G), and when the leakage current exceeds a certain range, the grounding part (215) will be turned off (by OPEN Go to CLOSE) The breaker (250) cuts off the power supply.

The electric shock cancellation part (400) can reduce the dangerous intensity caused by leakage current to the human body by canceling the magnetic flux when an electric shock accident occurs.

The alarm part and the monitoring part (500), wherein the alarm part of the alarm part and the monitoring part (500) can display load status or current status, and send out related alarm signals, and the monitoring part of the alarm part and the monitoring part (500) It will monitor the current status after the detection and electric shock cancellation operations are completed.

In a feasible embodiment, the detection part and the control part (200') can pass through the relay (RY3) of the ground part (215) after distinguishing the R phase and the neutral line N phase through the voltage detection circuit (200). , RY4) or the three-way switch SW3 is correctly connected to the ground (as shown in Figures 3 and 4).

In a feasible embodiment, the alarm unit and the monitoring unit (500) are connected with a display lamp and a horn with an alarm function.

In Figure 5, the electric shock cancellation part (455) of another feasible embodiment detects the leakage current through a current transformer (CT). When the value of the leakage current exceeds a certain range, the electric shock cancellation part (455) can The switch (SW) is turned off (CLOSE) to cut off the power supply of the internal socket C1, and the effect of electric shock cancellation can be achieved.

The anti-leakage device of the present invention not only has the effect of assisting the operator to correctly connect the input line, but also can correctly connect the neutral line (N phase) and the ground line (G) through the detection part and the control part (200).

In addition, the above-mentioned leakage prevention device of the present invention can start the leakage circuit breaker B and perform the overall external power cut-off operation when the value of the leakage current rapidly increases; therefore, it has actually solved the difficulty of the previous patent content and products. The problem.

As shown in Figures 6 to 8, the leakage prevention device D of the present invention includes: a detection part and a control part (200'), which can detect the leakage current through a current comparator (CT), and through a built-in voltage detection The circuit (220') distinguishes the R phase and the neutral line N phase; a disconnect part (250') can close the current according to the leakage current; an electric shock cancellation part (400') can pass through according to the leakage current The circuit breaker is used for electric shock cancellation; and an alarm unit and monitoring unit (500'), which can display the load status or current state of the detection unit, control unit (200') and electric shock cancellation unit (400'), and when it is detected When the value of exceeds a certain range, the alarm unit and monitoring unit (500') will issue related alarm signals.

Therefore, the leakage prevention device of the present invention can achieve the following functions through the following methods: the function of distinguishing the phase terminal and the neutral terminal through the detection part and the control part (200'), and the function of correctly connecting the distinguished terminal to the ground; Check whether the leakage current function occurs through the current comparator CT of the detection part and the control part (200'); when the leakage current intensity exceeds 15mA, the switch SW1 can be cut off to cut off the function of the circuit; when the leakage current intensity exceeds When the specified standard value or higher will cause danger to the human body, activate the electric shock cancellation part (400') to cut off the power supply of the internal socket C1 to achieve the function of preventing electric shock.

To further explain, after the voltage detection circuit of the detection unit and the control unit (200') distinguishes the R phase and the neutral line N phase; if the R phase and the neutral line N phase are connected to the correct ground position, the alarm unit And the monitoring part (500') will not send out an alarm; but on the contrary, when connected to an incorrect grounding position, the alarm part and the monitoring part (500') will generate an alarm (such as a red light), indicating the connection The status is abnormal. In addition, the alarm unit and monitoring unit (500') can also send out warning voice messages to remind the operator to reconnect the terminals. In this way, the functions of fire prevention and electric shock prevention can be achieved.

In a feasible embodiment, the alarm unit and the monitoring unit (500') are connected with a display lamp and a horn with an alarm function.

In Figure 7, the detection part and the control part (200') include a voltage detection circuit (220'), which can distinguish R phase and neutral N phase, and pass the current comparator (CT) detects the leakage current; the voltage detection circuit (220') will not generate a warning (light) when it detects that the R phase and the neutral line N phase are connected to the correct ground position; but on the contrary, if it is connected to the When the grounding position is correct, a warning (red light is on) will be generated, indicating that the connection status is abnormal. In addition, a warning voice message can also be issued to remind the operator to reconnect the terminals to achieve the function of preventing fire and electric shock.

When the detection unit and the control unit (200') detect the value of the leakage current through the comparator CT to exceed a certain range, the power supply can be cut off via a disconnection unit 250'.

In Figure 8, the electric shock cancellation part (455') of another possible embodiment is combined with a disconnection part (450'), when the electric shock cancellation part (455') detects the leakage current through the current transformer (CT) When the value of exceeds a certain range, the electric shock cancellation part (455') can close (CLOSE) the switch (SW2) through the disconnection part (450') to perform electric shock cancellation operation through the electric shock cancellation part (455'); and When the value of the leakage current rapidly increases, the electric shock canceling portion (455') can activate SW1 via the disconnecting portion (450') to perform the overall power-off operation.

In the above-mentioned anti-leakage device of the present invention, the input line, the detection part and the control part (200 or 200'), the disconnection part (250 or 250'), and the electric shock cancellation part (400 or 400') all adopt waterproof treatment.

In addition, when the R-phase and neutral-phase N-phase are connected incorrectly, a PIR is included in order to send out a warning voice message after the first warning (lights up red light) to indicate that the connection status is abnormal. (Passive Infrared) sensor, and the PIR (Passive Infrared) sensor has a Doppler module using the Doppler effect. Therefore, when the emitted microwave signal is reflected on the human body, it is affected by the Doppler effect, and the frequency of the microwave signal is proportional to the speed of the human body.

Because the frequency of the signal reflected from the human body with a certain period will maintain the same wavelength, but the phase will change with time and is proportional to the shift x(t).

Here, f0 represents the frequency of the input signal, v represents the speed of the moving human body, c represents the speed of light, f represents the change in frequency, λ represents the wavelength of the input signal, and x(t) represents the displacement of the human body.

Therefore, in the present invention, when the operator approaches this phase, a specific music or sound will be emitted to attract the operator's attention, and the risk of electric shock is emphasized.

Here, λ represents the wavelength of the signal. Since the signal reflected by the human body has entered the phase change state, when the displacement change of the human body is lower than the wavelength of the signal, the phase change is relatively small.

Through the above-mentioned proximity sensor with internal Doppler sensor (detecting phase change), when the operator gets closer and closer, it can be controlled such that the first voice message size control signal <the second voice message size control signal state. In this way, it can be applied to more diverse places.

In addition, the present invention is based on the signal change of the Doppler sensor at a certain frequency (the load status or current status can be displayed, and the relevant alarm signal information can be displayed. In addition, the status information after the detection and cancellation of the electric shock can be displayed) , After adjusting the size of the alarm sound, you can play it to the horn to remind the operator of the presence of danger; therefore, when the operator is approaching quickly, it can send out information based on the high frequency or phase change, the magnitude of the shift of the human body, etc. Higher audible alarm.

The alarm unit and the monitoring unit (500 or 500') further include a camera and a control unit, where the camera generates image data, and the control unit generates Meta information based on relevant information such as shooting conditions and current status. Then, after extracting Meta information from the image data, the Meta information is used to generate monitoring data, and finally the monitoring data is stored in the server.

Based on the above, the application of the present invention to the anti-leakage device for fire and water immersion and the anti-leakage and anti-shock method using the device can indeed achieve the effect of ensuring the correct wiring and preventing the risk of leakage. It is indeed a novel and progressive For invention, I filed an application for a patent for invention in accordance with the law; however, the content of the above description is only a description of the preferred embodiments of the present invention. Any change, modification, alteration or equivalent replacement based on the technical means and scope of the present invention is also applicable. All should fall within the scope of the patent application of the present invention.

200, 200': detection department and control department

215, 215': Grounding part

220': voltage detection circuit

250, 250', 450': circuit breaker

400, 455, 400', 455': electric shock cancellation part

500, 500': Alarm Department and Monitoring Department

CT: Specific flow device

SW, SW1, SW2: switch

SW3: Three-way switch

A: Transformer

A1: Power terminal

A2: Load end

B: Leakage circuit breaker

C: socket

C1: Internal socket

D: Anti-leakage device

E: Electrical

RY3, RY4: Relay

Figure 1 is a schematic diagram of an application situation of the present invention.

Figure 2 is a block diagram of a circuit structure that can be implemented in the present invention.

Figure 3 is a circuit diagram of the detection unit and control unit of the present invention combined with a grounding unit.

Figure 4 is a circuit diagram of the detection unit and control unit of the present invention combined with another grounding unit.

Fig. 5 is a circuit diagram of the electric shock cancellation part of the present invention.

Figure 6 is a block diagram of another circuit structure that can be implemented in the present invention.

Figure 7 is a circuit diagram of another detection unit and control unit combined with a grounding unit of the present invention.

Figure 8 is a circuit diagram of the combination of the disconnection part and the electric shock cancellation part of the present invention.

200: Detection Department and Control Department

215: Grounding part

250: Circuit Breaker

400: Electric shock cancellation part

500: Alarm Department and Monitoring Department

B: Leakage circuit breaker

C: socket

C1: Internal socket

Claims (8)

An anti-leakage device for fire and flooding, including: A detection part and control part (200, 200'), the detection part of the detection part and the control part (200) can confirm whether the state of the R phase and the N phase is correct, the detection part and the control part of the control part (200) Can control and offset the intensity of leakage current; A grounding part (215), after distinguishing the R phase and the N phase, connect the N phase to the ground (G); An electric shock cancellation part (400, 455) can reduce the dangerous intensity caused by leakage current to the human body by canceling the magnetic flux; An alarm unit and monitoring unit (500), the alarm unit of the alarm unit and monitoring unit (500) can display the load status or current status of the detection unit and the control unit (200) and the electric shock cancellation unit (400, 455) When the detected value exceeds a certain range, the alarm unit can issue a related alarm signal; the alarm unit and the monitoring unit of the monitoring unit (500) can monitor the current state after the detection and electric shock cancellation operations are completed. The anti-leakage device applied to fire and flooding as described in claim 1, wherein the grounding part (215) is connected to ground through one of the relay 3 (RY3, RY4) and the three-way switch SW3. The anti-leakage device applied to fire and flooding as described in claim 1, wherein the alarm unit and the monitoring unit (500) are provided with a display lamp and a horn capable of performing an alarm function. The electric leakage prevention device applied to fire and flooding as described in claim 1, wherein the electric shock cancellation part (455) can detect the leakage current through a current transformer (CT), and close the current according to the leakage current. As described in claim 1, the anti-leakage device applied to fire and flooding, wherein when the value of the leakage current exceeds a certain range or more, the electric shock canceling part (400) will activate the SW and cut off the entire power supply. A method for preventing electric leakage and electric shock using the above-mentioned electric leakage preventing device includes: A stage of displaying the connection status of the R phase and the neutral line N phase after the leakage current is detected through the current comparator (CT) in the detection part and the control part (200); 1. According to the leakage current, the stage is cut off by a circuit breaker (250); According to the leakage current, the electric shock cancellation part (400) cancels the electric shock stage. The method for preventing electric leakage and electric shock according to claim 1, wherein the detection part and the control part (200') distinguish the R phase and the neutral N phase through a voltage detection circuit (220'), if the R phase and the neutral When the neutral N-phase is connected to the correct grounding position, there will be no warning, but on the contrary, if it is connected to the incorrect grounding position, a warning will be generated, indicating that the connection state is abnormal; in addition, it also includes a through The voice message informs the operator of the stage of re-adjusting the connection position of the terminal and the ground. The method for preventing electric leakage and electric shock according to claim 1, wherein when the current comparator (CT) in the detecting part and the controlling part (200') detects the leakage current, the switch will be cut off by the circuit breaker (450') (SW2) is the stage of performing the electric shock cancellation work through the electric shock cancellation part (455').

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