CN116092736A

CN116092736A - Power cord, electrical connection device and electrical appliance

Info

Publication number: CN116092736A
Application number: CN202310174192.7A
Authority: CN
Inventors: 李成力; 陈龙
Original assignee: Suzhou Ele Mfg Co ltd
Current assignee: Suzhou Ele Mfg Co ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-05-09

Abstract

The invention proposes a power cord comprising: at least two current carrying lines; at least two insulating layers respectively coating corresponding current-carrying lines in the at least two current-carrying lines; the first shielding layer and the second shielding layer are respectively arranged around corresponding insulating layers in the at least two insulating layers and are used for detecting leakage current signals generated on corresponding current carrying wires; at least one shielding insulating layer disposed between the first shielding layer and the second shielding layer for insulating the first shielding layer and the second shielding layer from each other; the first signal conductor is arranged between the first shielding layer and the corresponding insulating layer or outside the first shielding layer; and the second signal conductor is arranged between the second shielding layer and the corresponding insulating layer or outside the second shielding layer, and the first signal conductor and the second signal conductor are respectively formed by twisting or braiding conductive wires and fiber wires and are used for transmitting leakage current signals. In the invention, the tensile property of the signal conductor is greatly improved, and the problem of signal conductor breakage generated when the power line is stressed to bend or stretch is solved.

Description

Power cord, electrical connection device and electrical appliance

Technical Field

The invention relates to the field of electric appliances, in particular to a power line, electric connection equipment and an electric appliance.

Background

The leakage detection protection device (hereinafter referred to as "LCDI device") is a safety protection device for electric fire, and has the main functions of detecting leakage current between a power line, a live wire, a zero wire, etc. between a power supply plug and a load electric appliance (such as an air conditioner and a dehumidifier) and a wire protection (shielding) layer, cutting off the power supply of electric equipment, and preventing the generation of fire so as 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 prior art, the signal conductors in contact with the shielding layer in the power cord for the LCDI device are weak in tensile strength, and are prone to break when the power cord is stressed to bend or stretch during use, resulting in failure of the LCDI device.

Therefore, there is a need for a power cord that effectively solves the problem of signal conductor breakage after multiple bends or stretches.

Disclosure of Invention

Based on the above-mentioned problems, a first aspect of the present invention proposes a power supply line comprising: at least two current carrying lines; at least two insulating layers respectively coating corresponding current carrying lines in the at least two current carrying lines; the first shielding layer and the second shielding layer are respectively arranged around corresponding insulating layers in the at least two insulating layers and are used for detecting leakage current signals generated on corresponding current carrying wires; at least one shielding insulating layer disposed between the first shielding layer and the second shielding layer for insulating the first shielding layer and the second shielding layer from each other; a first signal conductor disposed between the first shield layer and a corresponding insulating layer or outside the first shield layer and electrically coupled to the first shield layer; and a second signal conductor disposed between the second shielding layer and the corresponding insulating layer or outside the second shielding layer and electrically coupled with the second shielding layer, wherein the first signal conductor and the second signal conductor are formed by twisting or braiding at least one conductive wire and at least one fiber wire, and are used for transmitting the leakage current signal.

In some embodiments, the conductive filaments are metal filaments or carbon filaments and the filaments are kevlar filaments, nylon filaments or glass filaments.

In some embodiments, the solderability of the first and second signal conductors is higher than the solderability of the first and second shield layers.

In some embodiments, the first signal conductor is disposed between the first shielding layer and the corresponding insulating layer or outside the first shielding layer in parallel to the corresponding current carrying line or in a spiral wound manner.

In some embodiments, the second signal conductor is disposed between the second shielding layer and the corresponding insulating layer or outside the second shielding layer in parallel to the corresponding current carrying line or in a spiral wound manner.

In some embodiments, the first shielding layer and/or the second shielding layer and the at least one shielding insulating layer are independent of each other.

In some embodiments, the first shielding layer and/or the second shielding layer form a unitary structure with a corresponding shielding insulating layer of the at least one shielding insulating layer, and at least a portion of an inner surface of the unitary structure acts as the first shielding layer or the second shielding layer.

In some embodiments, the area of the first shielding layer and/or the second shielding layer is smaller than the area of a corresponding shielding insulating layer of the at least one shielding insulating layer.

In some embodiments, the at least one shielding insulating layer encapsulates at least one of the first shielding layer, the second shielding layer, the first signal conductor, the second signal conductor, and the at least one shielding insulating layer is an insulating plastic or insulating paper.

In some embodiments, the first signal conductor is coupled with the second signal conductor.

In some embodiments, the first signal conductor and the second signal conductor are uncoupled from each other.

A second aspect of the present invention proposes an electrical connection device comprising: a leakage detection protection device; and a power cord according to any one of the embodiments of the first aspect, the power cord being electrically coupled with the leakage detection protection device.

A third aspect of the present invention 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 power supply line according to any of the embodiments of the first aspect.

According to the invention, the tensile strength of the first signal conductor and the second signal conductor is greatly improved, the problem of signal conductor breakage possibly generated when the power line is bent or stretched under the stress is thoroughly solved, and the reliability of the electric leakage detection protection device is greatly improved. In addition, the power line has the advantages of simple 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 shows a perspective view of an electrical connection device comprising a power cord according to the invention;

fig. 2A shows a schematic cross-sectional structure of a first embodiment of a power line according to the present invention;

fig. 2B shows a perspective view of a first embodiment of a power cord according to the present invention;

fig. 3A shows a schematic cross-sectional structure of a second embodiment of a power line according to the present invention;

fig. 3B shows a perspective view of a second embodiment of a power cord according to the present invention;

fig. 4A shows a schematic cross-sectional structure of a third embodiment of a power line according to the present invention;

fig. 4B shows a perspective view of a third embodiment of a power cord according to the present invention;

fig. 5A shows a schematic cross-sectional structure of a fourth embodiment of a power line according to the present invention;

fig. 5B shows a perspective view of a fourth embodiment of a power cord according to the present invention;

fig. 6A shows a schematic cross-sectional structure of a fifth embodiment of a power line according to the present invention;

fig. 6B shows a perspective view of a fifth embodiment of a power cord according to the present invention;

fig. 7 shows a first schematic circuit schematic of the power cord according to the present invention applied to a leakage detection protection device;

fig. 8 shows a second schematic circuit schematic of the application of the power cord according to the invention to a leakage detection protection device;

fig. 9 shows a third schematic circuit schematic of the application of the power cord according to the invention to a leakage detection protection device; and

fig. 10 shows a fourth schematic circuit schematic of the power cord according to the present invention applied to the leakage detection protection device.

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 invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. 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 invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

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

The terms "connected," "coupled," and the like as used herein are not limited 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.

The invention aims to provide a power line. In the power line, the tensile property of the signal conductor is greatly improved, the problem of signal conductor breakage possibly generated when the power line is bent or stretched under stress is thoroughly solved, and the reliability of the leakage detection protection device is greatly improved. In addition, the power line has the advantages of simple structure, low cost and high safety.

Fig. 1 shows a perspective view of an electrical connection device comprising a power cord according to the invention. As shown in fig. 1, the electrical connection device comprises a leakage detection protection device 1 and a power cord 2 for supplying power to a load device. The earth leakage detection protection device 1 has a plug that can be plugged into a socket connected to the supply line. One end of the power line 2 is connected with the leakage detection protection device 1, and the other end is connected with load equipment. The earth leakage detection protection device 1 has a circuit processing unit 11 as shown in fig. 7-10.

Referring to fig. 2A and 2B, fig. 2A shows a schematic cross-sectional structure of a first embodiment of a power line according to the present invention. Fig. 2B shows a perspective view of a first embodiment of a power cord according to the invention. In the present embodiment, the power supply line 2 includes a first current carrying line 211, a second current carrying line 221, and a third current carrying line 231. The first insulating layer 212 encapsulates the corresponding first current line 211, the second insulating layer 222 encapsulates the corresponding second current line 222, and the third insulating layer 232 encapsulates the corresponding current line 231. The first shielding layer 241 covers the surface of the corresponding first insulating layer 212, and is used for detecting the leakage current signal generated on the corresponding first current carrying line 211. The second shielding layer 242 covers the surface of the corresponding second insulating layer 222, and is used for detecting the leakage current signal generated on the corresponding second current line 221. It can be appreciated that, since the first shielding layer 241 and the second shielding layer 242 are used for detecting the leakage current signal generated on the first current carrying line 211 and the second current carrying line 221, respectively, the first shielding layer 241 and the second shielding layer 242 can completely cover the surfaces of the corresponding insulating layers, so as to ensure the accuracy of leakage current detection.

In the present embodiment, the power line 2 further includes a first signal conductor 251 and a second signal conductor 252. The first signal conductor 251 is wound from at least one conductive wire 2511 and at least one fiber 2512. The second signal conductor 252 is formed by winding at least one conductive wire 2521 and at least one fiber wire 2522. The

conductive wires

2511 and 2521 may be, for example, metal wires or carbon fiber wires, or may be composed of other materials having conductive properties. The

filaments

2512 and 2522 may be, for example, kevlar filaments, nylon filaments or glass filaments, or may be formed of other materials having good tensile properties. The solderability of the first signal conductor 251 and the second signal conductor 252 is higher than the solderability of the first shield 241 and the second shield 242. The first signal conductor 251 is wound on the surface of the first shielding layer 241 in a spiral winding manner and is electrically coupled to the first shielding layer 241. The first signal conductor 251 is further coupled to the circuit processing unit 11 of the leakage detection protection device 1 for transmitting the leakage current signal detected by the first shielding layer 241 to the circuit processing unit 11. The second signal conductor 252 is wound around the surface of the second shielding layer 242 in a spiral winding manner and is electrically coupled to the second shielding layer 242. The second signal conductor 252 is also coupled to the circuit processing unit 11 of the leakage detection protection device 1 for transmitting the leakage current signal detected by the second shielding layer 242 to the circuit processing unit 11.

In this embodiment, a surface of the first shielding layer 241 contacting the first signal conductor 251 is a conductive surface. The side of the second shielding layer 242 that contacts the second signal conductor 252 is a conductive surface. The first and second shielding layers 241 and 242 may be metal thin films. The conductive material may be coated on the surface of the band-shaped material having a certain strength as the first shielding layer 241 and the second shielding layer 242. The power cord 2 further includes a first shielding insulating layer 261 partially or completely covering the surfaces of the first signal conductor 251 and the first shielding layer 241, for isolating the electrical connection between the first shielding layer 241 and the first signal conductor 251 and the second shielding layer 242 and the second signal conductor 252, and insulating the first shielding layer 241, the first signal conductor 251 and the second shielding layer 242 and the second signal conductor 252. As can be seen from fig. 2A and 2B, the first shielding insulating layer 261 and the first shielding layer 241 are independent of each other and are two separate layers.

Although in the present embodiment, the first shielding insulating layer 261 covers the surfaces of the first signal conductor 251 and the first shielding layer 241, it will be understood by those skilled in the art that the first shielding insulating layer 261 may also cover the surfaces of the second signal conductor 252 and the second shielding layer 242. Alternatively, the power line 2 may include two shielding insulating layers respectively covering the surfaces of the first signal conductor 251 and the first shielding layer 241, and the second signal conductor 252 and the second shielding layer 242.

Referring to fig. 3A and 3B, fig. 3A shows a schematic cross-sectional structure of a second embodiment of a power cord according to the present invention. Fig. 3B shows a perspective view of a second embodiment of a power cord according to the invention. In the present embodiment, the power supply line 2 includes a first current carrying line 211, a second current carrying line 221, and a third current carrying line 231. The first insulating layer 212 encapsulates the corresponding first current line 211, the second insulating layer 222 encapsulates the corresponding second current line 222, and the third insulating layer 232 encapsulates the corresponding current line 231.

conductive wires

filaments

2512 and 2522 may be, for example, kevlar filaments, nylon filaments or glass filaments, or may be formed of other materials having good tensile properties. The first signal conductor 251 is disposed between the first shielding layer 241 and the first insulating layer 212, is wound on the surface of the first insulating layer 212 in a spiral winding manner, and is electrically coupled to the first shielding layer 241. The second signal conductor 252 is disposed between the second shielding layer 242 and the second insulating layer 222, is wound on the surface of the second insulating layer 222 in a spiral winding manner, and is electrically coupled to the second shielding layer 242. The first shielding layer 241 covers the surfaces of the corresponding first signal conductor 251 and the first insulating layer 212, and is used for detecting the leakage current signal generated on the corresponding first current carrying line 211. The second shielding layer 242 covers the surfaces of the second signal conductor 252 and the second insulating layer 222, and is used for detecting the leakage current signal generated on the second current carrying line 221. It can be appreciated that, since the first shielding layer 241 and the second shielding layer 242 are used for detecting the leakage current signal generated on the first current carrying line 211 and the second current carrying line 221, respectively, the first shielding layer 241 and the second shielding layer 242 can completely cover the surfaces of the corresponding insulating layers, so as to ensure the accuracy of leakage current detection. The solderability of the first signal conductor 251 and the second signal conductor 252 is higher than the solderability of the first shield 241 and the second shield 242. The first signal conductor 251 is further coupled to the circuit processing unit 11 of the leakage detection protection device 1 for transmitting the leakage current signal detected by the first shielding layer 241 to the circuit processing unit 11. The second signal conductor 252 is also coupled to the circuit processing unit 11 of the leakage detection protection device 1 for transmitting the leakage current signal detected by the second shielding layer 242 to the circuit processing unit 11.

As shown in fig. 3A, the power line 2 includes a first shielding insulating layer 261 and a second shielding insulating layer 262 for isolating electrical connection between the first shielding layer 241, the first signal conductor 251 and the second shielding layer 242, the second signal conductor 252, and insulating the first shielding layer 241, the first signal conductor 251 and the second shielding layer 242, the second signal conductor 252. In this embodiment, the first shielding insulating layer 261 and the second shielding insulating layer 262 are plastic films, and the first shielding layer 241 and the second shielding layer 242 are metal films attached to the inner surfaces of the first shielding insulating layer 261 and the second shielding insulating layer 262 (i.e., the sides near the first signal conductor 251 and the second signal conductor 252), respectively, and are formed integrally with the first shielding insulating layer 261 and the second shielding insulating layer 262, respectively. That is, the first and second shielding layers 241 and 242 and the corresponding shielding insulating

layer

261 or 262 are formed of an integral structure, the body of which is a plastic film, and at least a partial region of the inner surface is attached with a metal film as the

shielding layer

241 or 242.

As shown in fig. 3B, in the present embodiment, since a part (but not all) of the inner surface of the plastic film is attached with the metal film, the area of the insulating portion on the plastic film is the sum of the area of the outer surface and the area of the non-attached metal film on the inner surface, and thus the area of the metal film is smaller than the area of the insulating portion on the plastic film. The insulating portion of the plastic film is the shielding insulating

layer

261 or 262. Accordingly, the area of the first shielding layer 241 is smaller than the area of the first shielding insulating layer 261, and the area of the second shielding layer 242 is smaller than the area of the second shielding insulating layer 262. In this way, it is possible to ensure complete insulation between the first shielding layer 241 and the second shielding layer 242 after the integrated structure is wound around the surfaces of the first and second insulating

layers

212 and 222.

Although in the present embodiment, the power line 2 includes the first shielding insulating layer 261 and the second shielding insulating layer 262, and the first shielding insulating layer 261 and the second shielding insulating layer 262 are formed of an integral structure with the first shielding layer 241 and the second shielding layer 242, respectively, it will be understood by those skilled in the art that it is also possible to provide only one integral first shielding insulating layer 261 and first shielding layer 241, and replace the integral second shielding insulating layer 262 and second shielding layer 242 in fig. 3A and 3B with the second shielding layer 242 in fig. 2A and 2B. Alternatively, the second shield insulating layer 262 and the second shield layer 242 integrated in fig. 3A and 3B may be replaced with the first insulating structure 261 and the first shield layer 241 independent of each other in fig. 2A and 2B.

Referring to fig. 4A and 4B, fig. 4A shows a schematic cross-sectional structure of a third embodiment of a power cord according to the present invention. Fig. 4B shows a perspective view of a third embodiment of a power cord according to the present invention. The main difference compared to the power lines of fig. 3A and 3B is that the first shielding layer 241 and the first shielding insulating layer 261 of the power line 2 of fig. 4A and 4B are independent from each other, as two separate layers; the second shield layer 242 and the second shield insulating layer 262 are independent of each other and are two separate layers. Other parts of the power line 2 are the same as the power line 2 of fig. 3A and 3B, and will not be described again here.

Referring to fig. 5A and 5B, fig. 5A shows a schematic cross-sectional structure of a fourth embodiment of a power cord according to the present invention. Fig. 5B shows a perspective view of a fourth embodiment of a power cord according to the present invention. Compared with fig. 2A and 2B, the main difference is that the power cord 2 of fig. 5A and 5B has a flat shape, and the shielding insulating layer 26 is molded as a whole to cover the surfaces of the first shielding layer 241, the first signal conductor 251, the second shielding layer 242 and the second signal conductor 252. Other parts of the power line 2 are the same as the power line 2 of fig. 2A and 2B, and will not be described again here.

Referring to fig. 6A and 6B, fig. 6A shows a schematic cross-sectional structure of a fifth embodiment of a power cord according to the present invention. Fig. 6B shows a perspective view of a fifth embodiment of a power cord according to the present invention. Compared to the power lines of fig. 3A and 3B, the main difference is that the first signal conductor 251 is arranged between the first shielding layer 241 and the first insulating layer 212 substantially parallel to the first current line 211, and the second signal conductor 252 is arranged between the second shielding layer 242 and the second insulating layer 222 substantially parallel to the second current line 221. Other parts of the power line 2 are the same as the power line 2 of fig. 3A and 3B, and will not be described again here.

Referring to fig. 7, fig. 7 shows a first schematic circuit schematic of the power cord according to the present invention applied to the leakage detection protection device. In fig. 7, a first shielding layer 241 is electrically coupled to a first signal conductor 251 and a second shielding layer 242 is electrically coupled to a second signal conductor 252. The B end of the first signal conductor 251 is connected to the D end of the second signal conductor 252, and the a end of the first signal conductor 251 and the C end of the second signal conductor 252 are connected to the signal processing unit 11 of the leakage detection protection device, respectively.

When leakage occurs on the first current carrying LINE 211, the leakage current signal passes through the first shielding layer 241-the first signal conductor 251-the second signal conductor 252-R2-ZD1 to trigger the SCR to be turned on, at this time, the second current carrying LINE 221-the solenoid SOL-SCR-D1-the first current carrying LINE 211 forms a loop, a larger current is generated in the solenoid SOL to form a magnetic field large enough to drive the RESET switch RESET to trip, and the power connection between the input end LINE and the output end LOAD is disconnected. When leakage occurs on the second current carrying LINE 221, the leakage current signal passes through the second shielding layer 242-the second signal conductor 252-R2-ZD1 to trigger the SCR to be turned on, and at this time, the second current carrying LINE 221-the solenoid SOL-SCR-D1-the first current carrying LINE 211 forms a loop, and a larger current is generated in the solenoid SOL to form a magnetic field large enough to drive the RESET switch to trip, so as to disconnect the power connection between the input end LINE and the output end LOAD.

Referring to fig. 8, fig. 8 shows a second schematic circuit schematic of the power line applied to the leakage detection protection device according to the present invention. Fig. 8 differs from fig. 7 mainly in that the first signal conductor 251 is wound around the surface of the first shielding layer 241, the a end of the first signal conductor 251 is connected to the D end of the second signal conductor 252, and the B end of the first signal conductor 251 and the C end of the second signal conductor 252 are connected to the signal processing unit 11 of the leakage detection protection device, respectively.

Referring to fig. 9, fig. 9 shows a third schematic circuit schematic of the power line applied to the leakage detection protection device according to the present invention. Fig. 9 differs from fig. 7 mainly in that the first signal conductor 251 is substantially parallel to the first current-carrying line 211 and the second signal conductor 252 is substantially parallel to the second current-carrying line 221. The B terminal of the first signal conductor 251 is connected to the D terminal of the second signal conductor 252 and to the signal processing unit 11 by a wire 24. The a-terminal of the first signal conductor 251 and the C-terminal of the second signal conductor 252 are also connected to the signal processing unit 11.

When leakage occurs on the first current carrying LINE 211, the leakage current signal passes through the first shielding layer 241-the first signal conductor 251-R2-ZD1 to trigger the SCR to be turned on, and at this time, the second current carrying LINE 221-the solenoid SOL-SCR-D1-the first current carrying LINE 211 forms a loop, and a larger current is generated in the solenoid SOL to form a magnetic field large enough to drive the RESET switch to trip, and the power connection between the input end LINE and the output end LOAD is disconnected. When leakage occurs on the second current carrying LINE 221, the leakage current signal passes through the second shielding layer 242-the second signal conductor 252-R2-ZD1 to trigger the SCR to be turned on, and at this time, the second current carrying LINE 221-the solenoid SOL-SCR-D1-the first current carrying LINE 211 forms a loop, and a larger current is generated in the solenoid SOL to form a magnetic field large enough to drive the RESET switch to trip, so as to disconnect the power connection between the input end LINE and the output end LOAD.

Referring to fig. 10, fig. 10 shows a fourth schematic circuit schematic of the power line applied to the leakage detection protection device according to the present invention. In fig. 10, a first shielding layer 241 is electrically coupled to a first signal conductor 251 and a second shielding layer 242 is electrically coupled to a second signal conductor 252. The a-and B-terminals of the first signal conductor 251 are connected to the signal processing unit 11, and the C-and D-terminals of the second signal conductor 252 are also connected to the signal processing unit 11, but the first signal conductor 251 and the second signal conductor 252 are not coupled to each other.

When leakage occurs on the first current LINE 211, a leakage current signal passes through the first shielding layer 241-the first signal conductor 251-R2 to trigger the silicon controlled rectifier SCR1 to be turned on, at this time, the first current LINE 211-the solenoid SOL 1-the silicon controlled rectifier SCR 1-the second current LINE 221 form a current loop, a larger current is generated in the solenoid SOL1 to form a magnetic field large enough to drive the RESET switch RESET to trip, and the power connection between the input end LINE and the output end LOAD is disconnected. When leakage occurs on the second current carrying LINE 221, the leakage current signal passes through the second shielding layer 242-the second signal conductor 252-R21 to trigger the SCR11 to be turned on, and at this time, the second current carrying LINE 221-the solenoid SOL 11-the SCR 11-the first current carrying LINE 211 forms a current loop, and a larger current is generated in the solenoid SOL11 to form a magnetic field large enough to drive the RESET switch RESET to trip, so as to disconnect the power connection between the input terminal LINE and the output terminal LOAD.

A second aspect of the present invention proposes an electrical connection device comprising: a leakage detection protection device; and a power cord according to any one of the above embodiments, the power cord being electrically coupled to the leakage detection protection device.

A third aspect of the present invention 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.

Therefore, while the present invention has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the invention, 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 invention.

Claims

1. A power cord comprising:

at least two current carrying lines;

at least two insulating layers respectively coating corresponding current carrying lines in the at least two current carrying lines;

the first shielding layer and the second shielding layer are respectively arranged around corresponding insulating layers in the at least two insulating layers and are used for detecting leakage current signals generated on corresponding current carrying wires;

at least one shielding insulating layer disposed between the first shielding layer and the second shielding layer for insulating the first shielding layer and the second shielding layer from each other;

a first signal conductor disposed between the first shield layer and a corresponding insulating layer or outside the first shield layer and electrically coupled to the first shield layer; and

a second signal conductor disposed between the second shield layer and a corresponding insulating layer or outside the second shield layer and electrically coupled to the second shield layer, wherein,

the first signal conductor and the second signal conductor are respectively formed by twisting or braiding at least one conductive wire and at least one fiber wire, and are used for transmitting the leakage current signals.

2. The power cord of claim 1, wherein the conductive filaments are metal filaments or carbon filaments and the filaments are kevlar filaments, nylon filaments or glass filaments.

3. The power cord of claim 1, wherein the first and second signal conductors have a solderability that is higher than the solderability of the first and second shield layers.

4. The power cord of claim 1, wherein the first signal conductor is disposed between the first shielding layer and the corresponding insulating layer or outside the first shielding layer in parallel to the corresponding current carrying cord or in a spiral wound manner.

5. The power line according to claim 1, wherein the second signal conductor is arranged between the second shielding layer and the corresponding insulating layer or outside the second shielding layer in parallel to the corresponding current carrying line or in a spiral wound manner.

6. The power cord of claim 1, wherein the first and/or second shielding layer and the at least one shielding insulating layer are independent of each other.

7. The power cord of claim 1, wherein the first and/or second shield layers form a unitary structure with a corresponding shield insulating layer of the at least one shield insulating layer, and at least a portion of an inner surface of the unitary structure acts as the first or second shield layer.

8. The power cord of claim 7, wherein an area of the first shielding layer and/or the second shielding layer is smaller than an area of a corresponding shielding insulating layer of the at least one shielding insulating layer.

9. The power cord of claim 1, wherein the at least one shielding insulating layer encases at least one of the first shielding layer, the second shielding layer, the first signal conductor, the second signal conductor, and the at least one shielding insulating layer is an insulating plastic or insulating paper.

10. The power cord of claim 1, wherein the first signal conductor is coupled with the second signal conductor.

11. The power cord of claim 1, wherein the first signal conductor and the second signal conductor are uncoupled from each other.

12. An electrical connection apparatus comprising:

a leakage detection protection device; and

the power cord as claimed in any one of claims 1-11, electrically coupled with the leakage detection protection device.

13. An electrical appliance, comprising:

a load device; and

the electrical connection device of claim 12, coupled between a power supply line and the load device for supplying power to the load device.