CN220291654U

CN220291654U - Leakage detection protection device, electric connection equipment and electric appliance

Info

Publication number: CN220291654U
Application number: CN202321692043.1U
Authority: CN
Inventors: 李成力; 聂胜云
Original assignee: Suzhou Ele Mfg Co ltd
Current assignee: Suzhou Ele Mfg Co ltd
Priority date: 2023-06-30
Filing date: 2023-06-30
Publication date: 2024-01-02
Anticipated expiration: 2033-06-30

Abstract

The utility model discloses a leakage detection protection device. The apparatus includes a leakage detection module including a first leakage detection line, a second leakage detection line, a signal line, and at least one resistive element and/or at least one semiconductor element, and configured to detect leakage current signals on the first and second current carrying lines, and generate leakage fault signals when the leakage current signals are detected, the first and second leakage detection lines being electrically insulated from each other and respectively coating at least one of the first and second current carrying lines, one ends of the first and second leakage detection lines connected in series being connected to the signal line, and further respectively forming a current loop with the signal line for detecting whether the leakage detection module is faulty, the at least one resistive element and/or the at least one semiconductor element being connected in the current loop. The utility model ensures the reliability of the leakage detection protection device by detecting whether the leakage detection line fails.

Description

Leakage detection protection device, electric connection equipment and electric appliance

Technical Field

The utility model relates to the field of electric appliances, in particular to a leakage detection protection device, electric connection equipment and an electric appliance.

Background

The utility model provides a power cord leakage detection protection device (abbreviated as "LCDI device" below) is a kind of safety protection device for electric fire, its main structure is the power cord with plug, and the main function is to detect the leakage current that takes place between power cord live wire, zero line etc. and the wire inoxidizing coating (shielding) between power plug to the load electrical apparatus (for example air conditioner, dehumidifier), and cut off the consumer power, prevent the production of conflagration to provide safety protection. Accordingly, the LCDI device can prevent arc fault fires caused by damage to the power line, a decrease in insulation strength, and the like due to live (L line), neutral (N line), ground wire aging, wear, extrusion, or animal biting among the power lines.

In the existing LCDI device, when the leakage detection line of the live wire or the zero wire in the power line does not have a protection function due to open circuit or disconnection, the product can still work normally, so that fire disaster or other hidden danger of electricity use safety exists.

Therefore, there is a need for an electric leakage detection protection device capable of detecting an electric leakage detection line.

Disclosure of Invention

Based on the above-mentioned problems, a first aspect of the present utility model proposes a leakage detection protection device, comprising: a leakage detection module including a first leakage detection line, a second leakage detection line, a signal line, and at least one resistive element and/or at least one semiconductor element, and configured to detect leakage current signals on the first current carrying line and the second current carrying line, and generate a leakage fault signal when the leakage current signals are detected, wherein,

The first leakage detection line and the second leakage detection line are electrically insulated from each other and respectively cover at least one of the first current carrying line and the second current carrying line, one ends of the first leakage detection line and the second leakage detection line which are connected in series are connected with the signal line, and further form current loops with the signal line respectively so as to be used for detecting whether the leakage detection module breaks down, and the at least one resistive element and/or the at least one semiconductor element are connected in the current loops.

In some embodiments, the first leakage detection line is connected in series with the second leakage detection line through the at least one resistive element and/or the at least one semiconductor element.

In some embodiments, the first and second leakage detection lines each have a first end proximate to an input end of the first and second current carrying lines and a second end proximate to an output end of the first and second current carrying lines, and the second end of the first leakage detection line is connected to the second end of the second leakage detection line through the at least one resistive element and/or the at least one semiconductor element.

In some embodiments, one end of the first leakage detection line and the second leakage detection line connected in series is connected to the signal line through the at least one resistive element and/or the at least one semiconductor element.

In some embodiments, the signal line has a first end near the input ends of the first and second current carrying lines and a second end near the output ends of the first and second current carrying lines, and one end of the first and second leakage detection lines connected in series is connected to the second end of the signal line through the at least one resistive element and/or the at least one semiconductor element.

In some embodiments, the at least one resistive element comprises a resistor, a capacitor, an inductor, and/or a wire.

In some embodiments, the at least one semiconductor element comprises a diode, a bipolar transistor, a field effect transistor, and/or a thyristor.

In some embodiments, the leakage detection protection device further comprises: a detection monitoring module coupled to the leakage detection module and configured to detect whether an open circuit fault has occurred in the first and second leakage detection lines via the current loop and to generate an open circuit fault signal when the open circuit fault has occurred.

In some embodiments, the detection monitoring module includes at least one resistor and/or at least one diode.

In some embodiments, the leakage detection protection device further comprises: a switching module configured to control an electrical connection between an input and an output of the first and second current carrying lines; and a drive module coupled to the leakage detection module and/or the detection monitoring module and configured to drive the switch module to disconnect the power connection in response to the leakage fault signal and/or the open circuit fault signal.

In some embodiments, at least one of the first and second leakage detection lines is outboard coated with an insulating structure.

In some embodiments, the insulating structure is integrally formed from plastic or is composed of insulating paper and/or insulating cotton.

In some embodiments, one side of the first and/or second leakage detection lines is an insulating material and the other side is a conductive material.

In some embodiments, the leakage detection protection device further comprises: a test module coupled to the leakage detection module and including a test switch and configured to generate the simulated leakage fault signal via the current loop to detect whether the leakage detection protection device is operating properly when the test switch is operated.

A second aspect of the present utility model proposes an electrical connection device comprising: a housing; and a leakage detection protection device according to any one of the embodiments of the first aspect, the leakage detection protection device being housed in the housing.

A third aspect of the present utility model proposes an electrical appliance comprising: a load device; and an electrical connection device coupled between the power supply line and the load device for supplying power to the load device, wherein the electrical connection device comprises a leakage detection protection apparatus according to any one of the embodiments of the first aspect.

The utility model ensures the reliability of the leakage detection protection device by detecting whether the leakage detection line fails. In addition, the leakage detection protection device provided by the utility model has the advantages of simple circuit structure, low cost and high safety.

Drawings

The embodiments are shown and described with reference to the drawings. The drawings serve to illustrate the basic principles and thus only show aspects necessary for understanding the basic principles. The figures are not to scale. In the drawings, like reference numerals refer to like features. In addition, a connection between each frame in the architecture diagram indicates that there is an electrical coupling between two frames, and the absence of a connection between two frames does not indicate that the two frames are not coupled.

Fig. 1 is a schematic diagram showing a conventional earth leakage detection protection device;

FIG. 2 shows a schematic diagram of a leakage detection protection device according to an embodiment of the present utility model;

fig. 3 shows a schematic diagram of a first embodiment of the earth leakage detection protection device according to the present utility model;

fig. 4 shows a schematic diagram of a second embodiment of the earth leakage detection protection device according to the present utility model;

fig. 5 shows a schematic diagram of a third embodiment of the earth leakage detection protection device according to the present utility model;

fig. 6 shows a schematic diagram of a fourth embodiment of the earth leakage detection protection device according to the present utility model;

fig. 7 shows a schematic diagram of a fifth embodiment of the earth leakage detection protection device according to the present utility model;

fig. 8 is a schematic view showing the outline structure of the leakage detection protection device according to the present utility model;

FIG. 9 illustrates a cross-sectional view of one embodiment of a power cord of the leakage detection protection device in accordance with the present utility model; and

fig. 10 shows a cross-sectional view of another embodiment of the power cord of the earth leakage detection protection device according to the present utility model.

Detailed Description

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the utility model may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the utility model. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present utility model. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present utility model is defined by the appended claims.

Before describing embodiments of the present utility model, some of the terms involved in the present utility model will be explained first for better understanding of the present utility model.

The terms "connected," "coupled," or "coupled" and the like as used herein are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "a," "an," "a group," or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

The terms "comprising," including, "and similar terms used herein should be construed to be open-ended terms, i.e., including, but not limited to," meaning that other elements may also be included. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment," and so forth. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Fig. 1 shows a schematic diagram of a conventional leakage detection protection device. As shown in fig. 1, the power supply line 2 includes a first current carrying line (e.g., a live line L) 21, a second current carrying line (e.g., a neutral line N) 22, a third current carrying line (e.g., a ground line G) 23, and a leakage detection line 24. When the leakage detection line 24 is not protected by an open circuit or an open circuit, the LCDI device can still function normally, thus presenting a fire hazard or other electrical safety hazard.

The present utility model aims to provide an electric leakage detection protection device in which reliability of the electric leakage detection protection device is ensured by detecting whether or not an electric leakage detection line fails.

Fig. 2 shows a schematic diagram of the earth leakage detection protection device according to the present utility model. As shown in fig. 2, the leakage detection protection device 200 includes a leakage detection module 204. The leakage detection module 204 is disposed between the input terminal 201 and the output terminal 202 of the first current-carrying line 21 and the second current-carrying line 22, and is configured to detect leakage current signals on the first current-carrying line 21 and the second current-carrying line 22, and generate a leakage fault signal when the leakage current signals are detected. The leakage detection module 204 includes a first leakage detection line, a second leakage detection line, a signal line, and at least one resistive element and/or at least one semiconductor element (not shown in fig. 2). Specifically, the leakage detection module 204 may include only one resistive element or one semiconductor element, a combination of one resistive element and one semiconductor element, may include more than one resistive element, more than one semiconductor element, a combination of one resistive element and more than one semiconductor element, a combination of one semiconductor element and more than one resistive element, or may also include a combination of more than one resistive element and more than one semiconductor element, and so on. The resistive element may include, for example, any one or more of a resistor, a capacitor, an inductor, and a wire having a certain resistance. The semiconductor element may include, for example, any one or more of a diode, a bipolar transistor, a field effect transistor, and a silicon controlled rectifier. For example, the leakage detection module 204 may include one or more resistors, one or more diodes, a combination of resistors and diodes, a combination of resistors, diodes and transistors, and so forth. The first and second leakage detection lines are electrically insulated from each other and each cover at least one of the first and second current carrying lines. One end of the first leakage detection line and one end of the second leakage detection line, which are connected in series, are connected with the signal line, and then form a current loop with the signal line respectively, so as to be used for detecting whether the leakage detection module 204 fails. At least one resistive element and/or at least one semiconductor element is connected in the current loop. The failure of the leakage detection module 204 may include, for example, an open circuit failure of the first leakage detection line and the second leakage detection line. The device 200 ensures the reliability of the leakage detection protection device by detecting whether the leakage detection line fails, and has simple circuit structure, low cost and high safety.

In some embodiments, the first leakage detection line is connected in series with the second leakage detection line by at least one resistive element and/or at least one semiconductor element.

In some embodiments, one end of the first and second leakage detection lines connected in series is connected to the signal line through at least one resistive element and/or at least one semiconductor element.

In some embodiments, at least one of the first and second leakage detection lines may be externally coated with an insulating structure such that the first and second leakage detection lines are electrically insulated from each other. The insulation structure can be formed by plastic integrally and is coated on the outer side of the first leakage detection line and/or the outer side of the second leakage detection line. Alternatively, the insulating structure may be insulating paper, insulating cotton or any other insulating material, and is coated on the outer side of the first leakage detection line and/or the second leakage detection line. Instead of providing a separate insulating structure, the first leakage detection line and/or the second leakage detection line may be manufactured using a sheet material having an insulating material on one side (e.g., an outer side) and a conductive material on the other side, thereby achieving electrical insulation between the first leakage detection line and the second leakage detection line.

In some embodiments, the leakage detection protection device 200 may also include a detection monitoring module (not shown in fig. 2). The detection monitoring module is coupled to the leakage detection module, detects whether an open circuit fault occurs in the first leakage detection line and the second leakage detection line via a current loop formed by the first leakage detection line, the signal line, the at least one resistive element and/or the semiconductor element and the second leakage detection line, and generates an open circuit fault signal when the open circuit fault occurs. The detection monitoring module may comprise at least one resistor and/or at least one diode.

In some embodiments, the leakage detection protection device 200 may also include a switching module and a driving module (not shown in fig. 2). The switching module controls the electrical connection between the input and the output of the first and second current carrying lines. The driving module is coupled to the leakage detection module 204 and/or the detection monitoring module, and drives the switching module to disconnect the power in response to the leakage fault signal and/or the open circuit fault signal, thereby further improving the reliability of the leakage detection protection device 200.

In some embodiments, the leakage detection protection device 200 may also include a test module (not shown in fig. 2). The test module is coupled to the leakage detection module 204 and includes a test switch. The test module generates a simulated leakage fault signal via a current loop formed by the first leakage detection line, the signal line, the at least one resistive element and/or the semiconductor element and the second leakage detection line when the test switch is operated, so as to detect whether the leakage detection protection device 200 works normally, thereby further improving the reliability of the leakage detection protection device 200.

Fig. 3 shows a schematic diagram of a first embodiment of the earth leakage detection protection device according to the present utility model. As shown in fig. 3, the leakage detection protection device 300 includes a switch module 203, a leakage detection module 204, a detection monitoring module 205, a driving module 206, and a testing module 207. The power supply line comprises a first current carrying line 21, a second current carrying line 22 and a ground line 23.

The switching module 203 comprises a RESET switch RESET for controlling the power connection between the input LINE and the output LOAD of the first and second current LINEs 21, 22. The leakage detection module 204 includes a first leakage detection line 241, a second leakage detection line 242, a signal line 25, and resistors R7-R9. In this embodiment, the first end B of the first leakage detection LINE 241, the first end a of the second leakage detection LINE 242, and the first end of the signal LINE 25 are ends near the input end LINE, which is located on the left side in fig. 3; the second end C of the first leakage detection line 241, the second end D of the second leakage detection line 242, and the second end of the signal line 25 are ends near the output end LOAD, which is located on the right side in fig. 3.

As shown in fig. 3, the first leakage detection line 241 is connected in series with the second leakage detection line 242 through resistors R9 and R7, and then connected with the signal line 25 through resistor R8. More specifically, the first end B of the first leakage detection line 241 is connected to one end of the switch TEST of the TEST module 207 and one end of the resistor R5B of the detection monitor module 205; the first end A of the second electric leakage detection line 242 is connected with the resistor R5C of the detection monitoring module 205; a first end of the signal line 25 is connected to one end of the resistor R5A of the detection monitor module 205 and the resistor R2 of the driving module 206. The second end C of the first leakage detection line 241 is connected to one end of the resistor R9, the second end D of the second leakage detection line 242 is connected to one end of the resistor R7, the second end of the signal line 25 is connected to one end of the resistor R8, and the other ends of the resistors R7, R8 and R9 are connected to form a connection point E. The first leakage detection lines 241, R9, R8 and the signal line 25 form a current loop; the second leakage detection lines 242, R7, R8 and the signal line 25 form a current loop. The other ends of the resistors R5B and R5C are connected to the first current line 21 and the RESET switch RESET of the switching module 203 via a diode D3. The other end of resistor R5A is connected to the anode of the SCR of drive module 206. The driving module 206 further includes a capacitor C1, resistors R1, R3, diodes D1, D2, and a light emitting diode LED. The capacitor C1 is connected with the control electrode of the silicon controlled rectifier SCR in parallel with the resistor R3. The anode of the thyristor SCR is connected to one end of the solenoid SOL, the other end of which is connected to the second current line 22 and to the RESET switch RESET. The anode of the diode D1 is connected to the cathode of the thyristor SCR, the cathode of which is connected to the first current line 21 and to the RESET switch RESET. The anode of the diode D2 is connected with the cathode of the silicon controlled rectifier SCR, and the cathode is connected with the anode of the silicon controlled rectifier SCR.

The TEST module 207 includes a resistor R4 and a TEST switch TEST connected in series. The resistor R4 is also connected to the first current line 21 and to the RESET switch RESET. In this embodiment, the first current-carrying line 21, the resistor R4, the TEST switch TEST, the first leakage detection line 241, the resistor R9, the resistor R8, the signal line 25, the resistor R2, the resistor R3, the diode D2, the solenoid SOL, and the second current-carrying line 22 form a TEST circuit.

Under the normal working condition of the leakage detection protection device 300, the voltage at the point a is limited to a lower potential by setting the resistance values of the resistors R7, R8, R9, R5A, R B and R5C, so that the voltage of the control electrode of the SCR is limited to an extremely low level, the SCR is not triggered, the switch module 203 is in a closed state, and the device 300 works normally.

When the first current carrying line 21 has a leakage fault (i.e. a leakage current signal exists), the first leakage detection line 241 is electrified, so that the potential at point a is increased, and when the leakage current on the first current carrying line 21 exceeds a set threshold value, current (i.e. the leakage fault signal) flows through the first current carrying line 21-the first leakage detection line 241-R9-R8-the signal line 25-R2 to trigger the SCR to be conducted. When the SCR is turned on, a trip circuit of the second current-carrying LINE 22-SOL-SCR-D1-first current-carrying LINE 21 is formed, a large current is generated on the solenoid SOL, and a magnetic field large enough to trip the RESET switch RESET is formed, so that the power connection between the input terminal LINE and the output terminal LOAD is cut off.

When the second current carrying wire 22 has a leakage fault (i.e. a leakage current signal exists), the second leakage detection wire 242 is electrified, so that the potential at the point a is increased, and when the leakage current on the second current carrying wire 22 exceeds a set threshold value, a current (i.e. the leakage fault signal) flows through the second current carrying wire 22-the second leakage detection wire 242-R7-R8-the signal wire 25-R2 to trigger the SCR to be conducted. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the first leakage detection line 241 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-R8-R7-the second leakage detection line 242-R5C-D3-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the second leakage detection line 242 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-R8-R9-the first leakage detection line 241-R5B-D3-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

The leakage detection protection device 300 also has a test function. The fault test of the leakage detection module 204 may be performed by the test module 207. When the TEST switch TEST is closed, i.e. the TEST circuit is a closed loop, a current, i.e. an analog leakage fault signal, flows in the loop of the first current carrying line 21-R4-TEST-first leakage detection line 241-R9-R8-signal line 25-R2-R3-D2-SOL-second current carrying line 22. The current will cause the voltage across resistor R3 to rise, triggering the SCR to turn on. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

If either or both of the first leakage detection line 241 and the signal line 25 are open or broken, then when the TEST switch TEST is closed, the TEST circuit cannot form a closed loop, no current will flow through the TEST circuit, the SCR cannot be triggered, and the RESET switch RESET will not trip. At this time, the user is prompted that there may be an open or broken condition of the first leakage detection line 241 and the signal line 25. Accordingly, the user can detect whether the first leakage detection line 241 and the signal line 25 are intact by operating the TEST switch TEST. It will be appreciated that in addition to detecting a failure of the leakage detection module 204, the test module 207 may also be used to detect whether other components in the test circuit are malfunctioning.

Fig. 4 shows a schematic diagram of a second embodiment of the earth leakage detection protection device according to the present utility model. The difference compared to the embodiment of fig. 3 is mainly that in the leakage detection module 204, the resistors R7-R9 are replaced by diodes D4 and D5.

In the leakage detection protection device 400, the second end C of the first leakage detection line 241 is directly connected in series with the second end D of the second leakage detection line 242. The anode of the diode D4 is connected to the cathode of the diode D5 and to the second end of the signal line 25; the cathode of the diode D4 is connected to the anode of the diode D5 and to the second end C of the first leakage detection line 241 and the second end D of the second leakage detection line 242, forming a connection point E.

Under the normal working condition of the leakage detection protection device 400, the voltage at the point a is limited to a lower potential by setting the resistance values of the resistors R5A, R5B and R5C, so that the voltage of the control electrode of the silicon controlled rectifier SCR is limited to an extremely low level, the silicon controlled rectifier SCR is not triggered, the switch module 203 is in a closed state, and the device 400 works normally.

When the first current carrying line 21 has a leakage fault (i.e. a leakage current signal exists), the first leakage detection line 241 is electrified, so that the potential at point a is increased, and when the leakage current on the first current carrying line 21 exceeds a set threshold value, a current (i.e. the leakage fault signal) flows through the first current carrying line 21, the first leakage detection line 241-D5 and the signal line 25-R2 to trigger the SCR to conduct. When the SCR is turned on, a trip circuit of the second current-carrying LINE 22-SOL-SCR-D1-first current-carrying LINE 21 is formed, a large current is generated on the solenoid SOL, and a magnetic field large enough to trip the RESET switch RESET is formed, so that the power connection between the input terminal LINE and the output terminal LOAD is cut off.

When the second current carrying wire 22 has a leakage fault (i.e. a leakage current signal exists), the second leakage detection wire 242 is electrified, so that the potential at the point a is increased, and when the leakage current on the second current carrying wire 22 exceeds a set threshold value, a current (i.e. the leakage fault signal) flows through the second current carrying wire 22, the second leakage detection wire 242-D5 and the signal wire 25-R2 to trigger the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the first leakage detection line 241 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-D4-second leakage detection line 242-R5C-D3-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the second leakage detection line 242 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-D4-the first leakage detection line 241-R5B-D3-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

The leakage detection protection device 400 also has a test function. The fault test of the leakage detection module 204 may be performed by the test module 207. When the TEST switch TEST is closed, i.e. the TEST circuit is a closed loop, a current, i.e. an analog leakage fault signal, flows in the loop of the first current carrying line 21-R4-TEST-first leakage detection line 241-D5-signal line 25-R2-R3-D2-SOL-second current carrying line 22. The current will cause the voltage across resistor R3 to rise, triggering the SCR to turn on. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

Fig. 5 shows a schematic diagram of a third embodiment of the earth leakage detection protection device according to the present utility model. The difference compared to the embodiment of fig. 3 is mainly that in the leakage detection module 204, the resistors R7-R9 are replaced by diodes D4-D7 and a resistor R6.

In the leakage detection protection device 500, the second end C of the first leakage detection line 241 is connected in series with the second end D of the second leakage detection line 242 through diodes D4-D7. The anode of the diode D4 is connected to the cathode of the diode D5 and to the second end D of the second leakage detection line 242; the cathode of the diode D6 is connected to the anode of the diode D7 and to the second end C of the first leakage detection line 241; one end of the resistor R6 is connected to the second end of the signal line 25; the cathode of diode D4, the anode of diode D5, the anode of diode D6, the cathode of diode D7, and the other end of resistor R6 are connected to form connection point E.

Under the normal working condition of the leakage detection protection device 500, the voltage at the point a is limited to a lower potential by setting the resistance values of the resistors R6, R5A, R B and R5C, so that the voltage of the control electrode of the SCR is limited to an extremely low level, the SCR is not triggered, the switch module 203 is in a closed state, and the device 500 works normally.

When the first current carrying line 21 has a leakage fault (i.e. a leakage current signal exists), the first leakage detection line 241 is electrified, so that the potential at the point a is increased, and when the leakage current on the first current carrying line 21 exceeds a set threshold value, a current (i.e. the leakage fault signal) flows through the first current carrying line 21-the first leakage detection line 241-D7-R6-the signal line 25-R2 to trigger the SCR to be conducted. When the SCR is turned on, a trip circuit of the second current-carrying LINE 22-SOL-SCR-D1-first current-carrying LINE 21 is formed, a large current is generated on the solenoid SOL, and a magnetic field large enough to trip the RESET switch RESET is formed, so that the power connection between the input terminal LINE and the output terminal LOAD is cut off.

When the second current carrying wire 22 has a leakage fault (i.e. a leakage current signal exists), the second leakage detection wire 242 is electrified, so that the potential at the point a is increased, and when the leakage current on the second current carrying wire 22 exceeds a set threshold value, a current (i.e. the leakage fault signal) flows through the second current carrying wire 22-the second leakage detection wire 242-D4-R6-the signal wire 25-R2 to trigger the SCR to be conducted. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the first leakage detection line 241 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-R6-D5-second leakage detection line 242-R5C-D3-first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the second leakage detection line 242 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-R6-D6-the first leakage detection line 241-R5B-D3-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

The leakage detection protection device 500 also has a test function. The fault test of the leakage detection module 204 may be performed by the test module 207. When the TEST switch TEST is closed, i.e. the TEST circuit is a closed loop, a current, i.e. an analog leakage fault signal, flows in the loop of the first current carrying line 21-R4-TEST-first leakage detection line 241-D7-R6-signal line 25-R2-R3-D2-SOL-second current carrying line 22. The current will cause the voltage across resistor R3 to rise, triggering the SCR to turn on. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

Fig. 6 shows a schematic diagram of a fourth embodiment of the earth leakage detection protection device according to the present utility model. The difference compared to the embodiment of fig. 3 is mainly that R8 is replaced with D4 and D5 in the leakage detection module 204 and the diode D3 is omitted in the detection monitoring module 205.

In the leakage detection protection device 600, the second end C of the first leakage detection line 241 is connected in series with the second end D of the second leakage detection line 242 through the resistors R7 and R9, and then connected with the second end of the signal line 25 through the diodes D4 and D5. The anode of the diode D4 is connected to the cathode of the diode D5 and to the second end of the signal line 25; one end of the resistor R9 is connected to the second end C of the first leakage detection line 241; one end of the resistor R7 is connected to the second end D of the second leakage detection line 242; the cathode of diode D4, the anode of diode D5, and the other ends of resistors R7 and R9 are connected to form connection point E.

Under the normal working condition of the leakage detection protection device 600, the voltage at the point a is limited to a lower potential by setting the resistance values of the resistors R7, R9, R5A, R B and R5C, so that the voltage of the control electrode of the SCR is limited to an extremely low level, the SCR is not triggered, the switch module 203 is in a closed state, and the device 600 works normally.

When the first current carrying line 21 has a leakage fault (i.e. a leakage current signal exists), the first leakage detection line 241 is electrified, so that the potential at the point a is increased, and when the leakage current on the first current carrying line 21 exceeds a set threshold value, current (i.e. the leakage fault signal) flows through the first current carrying line 21-the first leakage detection line 241-R9-D5-the signal line 25-R2 to trigger the SCR to be conducted. When the SCR is turned on, a trip circuit of the second current-carrying LINE 22-SOL-SCR-D1-first current-carrying LINE 21 is formed, a large current is generated on the solenoid SOL, and a magnetic field large enough to trip the RESET switch RESET is formed, so that the power connection between the input terminal LINE and the output terminal LOAD is cut off.

When the second current carrying wire 22 has a leakage fault (i.e. a leakage current signal exists), the second leakage detection wire 242 is electrified, so that the potential at the point a is increased, and when the leakage current on the second current carrying wire 22 exceeds a set threshold value, a current (i.e. the leakage fault signal) flows through the second current carrying wire 22-the second leakage detection wire 242-R7-D5-the signal wire 25-R2 to trigger the SCR to be conducted. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the first leakage detection line 241 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-D4-R7-the second leakage detection line 242-R5C-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the second leakage detection line 242 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-D4-R9-the first leakage detection line 241-R5B-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

The leakage detection protection device 500 also has a test function. The fault test of the leakage detection module 204 may be performed by the test module 207. When the TEST switch TEST is closed, i.e. the TEST circuit is a closed loop, a current, i.e. an analog leakage fault signal, flows in the loop of the first current carrying line 21-R4-TEST-first leakage detection line 241-R9-D5-signal line 25-R2-R3-D2-SOL-second current carrying line 22. The current will cause the voltage across resistor R3 to rise, triggering the SCR to turn on. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

Fig. 7 shows a schematic diagram of a fifth embodiment of the earth leakage detection protection device according to the present utility model. In comparison to the embodiment of fig. 3, the difference is mainly that the monitoring and monitoring module 205 does not include a diode D3, and the resistors R5B and R5C are connected to the anode of a diode D1, and the diode D1 is a common diode of the monitoring and monitoring module 205 and the driving module 206.

Under the normal working condition of the leakage detection protection device 700, the voltage at the point a is limited to a lower potential by setting the resistance values of the resistors R7, R8, R9, R5A, R B and R5C, so that the voltage of the control electrode of the SCR is limited to an extremely low level, the SCR is not triggered, the switch module 203 is in a closed state, and the device 700 works normally.

When the first leakage detection line 241 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-R8-R7-the second leakage detection line 242-R5C-D1-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

When the second leakage detection line 242 is opened or disconnected, a current (i.e., an open circuit fault signal) flows through the second current-carrying line 22-SOL-R5A-signal line 25-R8-R9-the first leakage detection line 241-R5B-D1-the first current-carrying line 21, the potential at point a increases, and the voltage at both ends of the resistor R3 increases, triggering the SCR to conduct. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

The leakage detection protection device 700 also has a test function. The fault test of the leakage detection module 204 may be performed by the test module 207. When the TEST switch TEST is closed, i.e. the TEST circuit is a closed loop, a current, i.e. an analog leakage fault signal, flows in the loop of the first current carrying line 21-R4-TEST-first leakage detection line 241-R9-R8-signal line 25-R2-R3-D2-SOL-second current carrying line 22. The current will cause the voltage across resistor R3 to rise, triggering the SCR to turn on. When the SCR is turned on, the tripping loop is formed, a large current is generated on the solenoid SOL, a magnetic field is formed to be large enough, so that the RESET switch RESET is tripped, and the power connection between the input end LINE and the output end LOAD is cut off.

Fig. 8 is a schematic view showing the outline structure of the leakage detection protection device according to the present utility model. Fig. 9 shows a cross-sectional view of one embodiment of a power cord of the earth leakage detection protection device in accordance with the present utility model. Referring to fig. 8 and 9 together, the leakage detection protection device includes a plug portion 1 with a switching unit and an external power cord 2. The plug part 1 is also provided with a TEST switch TEST and a RESET switch RESET. The power line 2 includes a first current carrying line (e.g., live line L) 21, a second current carrying line (e.g., neutral line N) 22, a third current carrying line (e.g., ground line G) 23, a first leakage detection line 241, a second leakage detection line 242, a signal line 25, a wire filler (or filler) 26, an insulating coating 27, and an insulating structure 28 coating the outside of the first leakage detection line 241. The signal line 25 is a conductor with a separate insulating layer and can be arranged at any position in the power line 2. It will be appreciated that the signal lines 25 may be arranged in any suitable location and are not limited to the locations shown in fig. 8 and 9.

In the embodiment of fig. 8 and 9, the power cord 2 has a circular shape. The first current-carrying line 21, the second current-carrying line 22 and the third current-carrying line 23 are respectively clad with insulating layers, such as insulating layers 21A and 22A. The first leakage detection line 241 covers the insulating layer 21A of the first current line 21, and the second leakage detection line 242 covers the insulating layer 22A of the second current line 22. The insulating structure 28 wraps the first leakage detection line 241. The insulating structure 28 may be integrally formed of a plastic material, or may be formed by coating a material conforming to the electrical insulating property, such as insulating paper or insulating cotton. In some embodiments, the first and second leakage detection lines 241 and 242 may be made of a single-sided insulating material (i.e., one side is an electrically conductive material and the other side is an insulating material), which is used as electrical insulation without requiring a separate insulating structure. In some embodiments, the outer sides of the first and second leakage detection lines 241 and 242 are respectively covered with an insulating structure. The first leakage detecting line 241 and the second leakage detecting line 242 may be a metal (e.g., copper, aluminum, etc.) braid structure, a wound structure composed of at least one metal wire, a metal foil clad structure, or a combination of any of these structures.

Fig. 10 shows a cross-sectional view of another embodiment of the power cord of the earth leakage detection protection device according to the present utility model. As shown in fig. 10, the power supply line 2 includes a first current carrying line (e.g., a live line L) 21, a second current carrying line (e.g., a neutral line N) 22, a third current carrying line (e.g., a ground line G) 23, a first leakage detection line 241, a second leakage detection line 242, a signal line 25, and an insulating cover 27.

In the embodiment of fig. 10, the power cord 2 is in the form of a side-by-side flat cord. The first current-carrying line 21, the second current-carrying line 22 and the third current-carrying line 23 are each clad with an insulating layer. The first leakage detection line 241 covers the insulating layer of the first current line 21, and the second leakage detection line 242 covers the insulating layer of the second current line 22. The first leakage detection line 241 and the second leakage detection line 242 are insulated by the insulating cover 27. The insulating cover 27 may be integrally formed of a plastic material, or may be formed by coating a material conforming to the electrical insulating property, such as insulating paper or insulating cotton.

In the above-described embodiment, the reliability of the leakage detection protection device is ensured by detecting whether or not the leakage detection line malfunctions. In addition, the leakage detection protection device provided by the utility model has the advantages of simple circuit structure, low cost and high safety.

A second aspect of the present utility model proposes an electrical connection device comprising: a housing; and a leakage detection protection device according to any one of the above embodiments, the leakage detection protection device being housed in the housing.

A third aspect of the present utility model proposes an electrical appliance comprising: a load device; and an electrical connection device coupled between the power supply line and the load device for supplying power to the load device, the electrical connection device including the leakage detection protection device of any of the above embodiments.

Therefore, while the present utility model has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the utility model, it will be apparent to those of ordinary skill in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the utility model.

Claims

1. An earth leakage detection protection device, characterized in that the earth leakage detection protection device comprises:

a leakage detection module including a first leakage detection line, a second leakage detection line, a signal line, and at least one resistive element and/or at least one semiconductor element, and configured to detect leakage current signals on the first current carrying line and the second current carrying line, and generate a leakage fault signal when the leakage current signals are detected, wherein,

2. The leakage detection protection device of claim 1, wherein the first leakage detection line is connected in series with the second leakage detection line through the at least one resistive element and/or the at least one semiconductor element.

3. The leakage detection protection device of claim 2, wherein the first and second leakage detection lines each have a first end proximate to an input end of the first and second current carrying lines and a second end proximate to an output end of the first and second current carrying lines, and wherein the second end of the first leakage detection line is connected to the second end of the second leakage detection line through the at least one resistive element and/or the at least one semiconductor element.

4. A leakage detection protection device according to any one of claims 1-3, wherein one end of the first leakage detection line and the second leakage detection line connected in series is connected to the signal line through the at least one resistive element and/or the at least one semiconductor element.

5. The leakage detection protection device according to claim 4, wherein the signal line has a first end close to the input ends of the first and second current carrying lines and a second end close to the output ends of the first and second current carrying lines, and wherein an end of the first and second leakage detection lines connected in series is connected to the second end of the signal line through the at least one resistive element and/or the at least one semiconductor element.

6. The leakage detection protection device of claim 1, wherein the at least one resistive element comprises a resistor, a capacitor, an inductor, and/or a wire.

7. The leakage detection and protection device of claim 1, wherein the at least one semiconductor element comprises a diode, a bipolar transistor, a field effect transistor, and/or a thyristor.

8. The electrical leakage detection protection device of claim 1, further comprising:

a detection monitoring module coupled to the leakage detection module and configured to detect whether an open circuit fault has occurred in the first and second leakage detection lines via the current loop and to generate an open circuit fault signal when the open circuit fault has occurred.

9. The leakage detection protection device of claim 8, wherein the detection monitoring module comprises at least one resistor and/or at least one diode.

10. The electrical leakage detection protection device of claim 8, further comprising:

a switching module configured to control an electrical connection between an input and an output of the first and second current carrying lines; and

a drive module coupled to the leakage detection module and/or the detection monitoring module and configured to drive the switch module to disconnect the power connection in response to the leakage fault signal and/or the open circuit fault signal.

11. The leakage detection protection device of claim 1, wherein at least one of the first leakage detection line and the second leakage detection line is externally coated with an insulating structure.

12. The leakage detection and protection device according to claim 11, wherein the insulating structure is formed integrally of plastic or is composed of insulating paper and/or insulating cotton.

13. The leakage detection protection device according to claim 1, wherein one side of the first leakage detection line and/or the second leakage detection line is an insulating material, and the other side is a conductive material.

14. The electrical leakage detection protection device of claim 1, further comprising:

a test module coupled to the leakage detection module and including a test switch and configured to generate the simulated leakage fault signal via the current loop to detect whether the leakage detection protection device is operating properly when the test switch is operated.

15. An electrical connection apparatus, the electrical connection apparatus comprising:

a housing; and

the leakage detection protection device according to any one of claims 1-14, the leakage detection protection device being housed in the housing.

16. An electrical appliance, the electrical appliance comprising:

a load device;

an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, wherein the electrical connection device comprises the leakage detection protection apparatus according to any one of claims 1-14.