Detection protection device of power line, electric connection equipment and electric equipment

Abstract

The invention discloses a power line detection protection device, electric connection equipment and electric equipment, a power line comprises a first current-carrying wire, a second current-carrying wire, a first shielding conductor and a second shielding conductor, and the detection protection device comprises a self-checking path module, a high-frequency coupling injection module, a coupling receiving module and a response processing module. The self-checking path module is electrically connected with the first current-carrying wire, the first shielding conductor, the second current-carrying wire and the second shielding conductor so as to construct a high-frequency detection path; the high-frequency coupling injection module is used for injecting a high-frequency signal into the high-frequency detection path; the coupling receiving module is used for receiving a high-frequency signal from the high-frequency detection path; and the response processing module is used for disconnecting the power connection between the input end and the output end of the power line according to the high-frequency signal under the condition that an open circuit occurs and / or an electric leakage signal is detected. The detection protection device of the power line can effectively and reliably realize electric leakage detection of the power line and open circuit detection of the shielding conductor of the power line.

Description

Technical Field

[0001] The present invention relates to the field of electrical technologies, and particularly to a detection and protection device for a power cord, an electrical connection device, and an electrical equipment. Background Art

[0002] A Leakage Circuit Detector Interrupter (LCDI) is a power connection device for electrical appliances, which can detect the leakage current of a power cord group through a leakage current detection line, and cut off the power connection of the electrical appliance when a certain leakage current is detected to ensure safe use. In recent years, in addition to detecting the leakage current of the power cord through the leakage current detection line, the leakage current detection circuit breaker has also put forward higher safety detection requirements, such as detecting whether there is an open circuit in the leakage current detection line.

[0003] How to effectively and reliably achieve the leakage detection of the power cord and the open circuit detection of the shielding conductor of the power cord has become a problem that needs to be solved by the current power connection device. Summary of the Invention

[0004] An object of the present invention is to at least solve one of the technical problems existing in the prior art, and provide a detection and protection device for a power cord, an electrical connection device, and an electrical equipment, which can effectively and reliably achieve the leakage detection of the power cord and the open circuit detection of the shielding conductor of the power cord.

[0005] In a first aspect, an embodiment of the present invention provides a detection and protection device for a power cord. The power cord includes a first current-carrying line, a second current-carrying line, a first shielding conductor covering the first current-carrying line, and a second shielding conductor covering the second current-carrying line. The detection and protection device includes a self-checking path module, a high-frequency coupling injection module, a coupling receiving module, and a response processing module, wherein:

[0006] The self-checking path module is electrically connected to the first current-carrying line, the first shielding conductor, the second current-carrying line, and the second shielding conductor to construct a high-frequency detection path;

[0007] The high-frequency coupling injection module is used to inject a high-frequency signal into the high-frequency detection path;

[0008] The coupling receiving module is used to receive a high-frequency signal from the high-frequency detection path;

[0009] The response processing module is electrically connected to the high-frequency coupling injection module and the coupling receiving module, and is configured to disconnect the power connection between the input end and the output end of the power line according to the high-frequency signal when an open circuit occurs in the first shielding conductor, an open circuit occurs in the second shielding conductor, a leakage signal is detected in the first shielding conductor, and / or a leakage signal is detected in the second shielding conductor.

[0010] The detection and protection device for a power line provided by an embodiment of the present invention has at least the following beneficial effects: By adopting a self-checking path module in cooperation with a first current-carrying line, a second current-carrying line, a first shielding conductor, and a second shielding conductor to form a high-frequency detection path, and injecting a high-frequency signal into the high-frequency detection path, the high-frequency signal is received by the coupling receiving module after flowing through the high-frequency detection path and transmitted to the response processing module. When a leakage or open circuit occurs, the power connection between the input end and the output end of the power line is disconnected by the response processing module, ensuring the power supply safety of the power line; the detection and protection device for the power line can effectively and reliably implement the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line.

[0011] In the detection and protection device provided by some embodiments of the present invention, the self-checking path module includes a first capacitor and a second capacitor. The first capacitor is electrically connected to the first current-carrying line and the first shielding conductor, and the second capacitor is electrically connected to the second current-carrying line and the second shielding conductor.

[0012] In the detection and protection device provided by some embodiments of the present invention, the first shielding conductor includes a first end close to the input end of the power line and a second end close to the output end of the power line; the second shielding conductor includes a fourth end close to the input end of the power line and a fifth end close to the output end of the power line.

[0013] In the detection and protection device provided by some embodiments of the present invention, the self-checking path module further includes a first connecting conductor electrically connecting the first shielding conductor and the second shielding conductor.

[0014] In the detection and protection device provided by some embodiments of the present invention, the self-checking path module includes one of the following situations:

[0015] Situation 1: The first capacitor is connected to the first current-carrying line and the second end, the second capacitor is connected to the second current-carrying line and the fifth end, and the first connecting conductor is connected to the first end and the fourth end;

[0016] Situation 2: The first capacitor is connected to the first current-carrying line and the first end, the second capacitor is connected to the second current-carrying line and the fourth end, and the first connecting conductor is connected to the second end and the fifth end.

[0017] According to the detection and protection device provided by some embodiments of the present invention, the high-frequency coupling injection module is disposed on one side of the first current-carrying line close to the input end of the power line, and the coupling receiving module is disposed on one side of the second current-carrying line close to the input end of the power line.

[0018] According to the detection and protection device provided by some embodiments of the present invention, the first capacitor connects the first current-carrying line and the second terminal; the second capacitor connects the second current-carrying line and the fifth terminal;

[0019] The high-frequency coupling injection module is provided on one side of the first current-carrying line close to the input end of the power line and on one side of the second current-carrying line close to the input end of the power line;

[0020] The coupling receiving module is provided at a position of the first shielding conductor close to the first terminal and at a position of the second shielding conductor close to the fourth terminal.

[0021] According to the detection and protection device provided by some embodiments of the present invention, the first capacitor connects the first current-carrying line and the first terminal; the second capacitor connects the second current-carrying line and the fourth terminal;

[0022] The self-checking path module further includes a second connection conductor connecting the second terminal and a third connection conductor connecting the fifth terminal;

[0023] The high-frequency coupling injection module is provided on one side of the first current-carrying line close to the input end of the power line and on one side of the second current-carrying line close to the input end of the power line;

[0024] The coupling receiving module is provided on both the second connection conductor and the third connection conductor.

[0025] According to the detection and protection device provided by some embodiments of the present invention, the response processing module includes a control module and a trigger module connected in sequence;

[0026] The control module is configured to: control the high-frequency coupling injection module to inject a high-frequency signal into the high-frequency detection path, obtain the high-frequency signal received by the coupling receiving module, and output a trip trigger signal when the phase difference between the injected high-frequency signal and the received high-frequency signal falls within a preset range or no high-frequency signal is received;

[0027] The trigger module is configured to: in response to receiving the trip trigger signal, disconnect the power connection between the input end and the output end of the power line through the switch module.

[0028] According to the detection and protection device provided by some embodiments of the present invention, when the first current-carrying line leaks electricity to the first shielding conductor, and / or the second current-carrying line leaks electricity to the second shielding conductor, the phase difference between the high-frequency signal injected into the high-frequency detection path by the high-frequency coupling injection module and the high-frequency signal received by the coupling reception module falls within a preset range, and the preset range is 0°±10° or 180°±10°.

[0029] According to the detection and protection device provided by some embodiments of the present invention, when an open circuit occurs in the first shielding conductor and / or the second shielding conductor, the coupling reception module does not receive a high-frequency signal.

[0030] The detection and protection device provided by some embodiments of the present invention further includes a DC power supply module, and the DC power supply module is used to supply power to at least one of the high-frequency coupling injection module, the coupling reception module, the control module, and the trigger module.

[0031] The detection and protection device provided by some embodiments of the present invention further includes a test module, and the test module includes a test switch electrically connected to the output end of the DC power supply module and the control module;

[0032] When the test switch is not pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of the first period into the high-frequency detection path;

[0033] When the test switch is pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of the second period into the high-frequency detection path.

[0034] In a second aspect, an embodiment of the present invention provides an electrical connection device, including the detection and protection device, a housing, and the power cord described in the first aspect embodiment above. The power cord is connected to the housing, and the response processing module is disposed in the housing.

[0035] In a third aspect, an embodiment of the present invention provides an electrical equipment, including a load device and the electrical connection device described in the second aspect embodiment above. The output end of the power cord is connected to the load device.

[0036] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in the specification, the claims, and the drawings. Description of the Drawings

[0037] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0039] Figure 1 is the circuit schematic diagram of the detection and protection device provided by the first embodiment of the present invention;

[0040] Figure 2 is the circuit schematic diagram of the detection and protection device provided by the second embodiment of the present invention;

[0041] Figure 3 is the circuit schematic diagram of the detection and protection device provided by the third embodiment of the present invention;

[0042] Figure 4 is the circuit schematic diagram of the detection and protection device provided by the fourth embodiment of the present invention;

[0043] Figure 5 is the detailed circuit schematic diagram of the response processing module of the detection and protection device provided by the first embodiment of the present invention;

[0044] Figure 6 is the flowchart of the operation of the detection and protection device provided by the embodiment of the present invention;

[0045] Figure 7 is the structural schematic diagram of the electrical connection device provided by the embodiment of the present invention. Detailed implementation manners

[0046] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The role of the accompanying drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation to the protection scope of the present invention.

[0047] In the description of the embodiments of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, "above", "below", "within", etc. are understood as including the number itself, "at least one" means one or more, and "at least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0048] It should be noted that in the embodiments of the present invention, words such as "setting", "installing", and "connecting" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0049] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It can detect the leakage current of the power line group through a leakage current detection line and cut off the power connection of the electrical appliance when a certain leakage current is detected to ensure safe use. In recent years, in addition to detecting the leakage current of the power line through the leakage current detection line, the leakage circuit detector interrupter has also put forward higher safety detection requirements, such as detecting whether there is an open circuit in the leakage current detection line. How to effectively and reliably achieve the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line has become a problem that needs to be solved by the current power connection device.

[0051] Based on this, the embodiments of the present invention provide a detection and protection device for a power line, an electrical connection device, and an electrical equipment, which can effectively and reliably achieve the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line.

[0052] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0053] Figure 1 is the circuit schematic diagram of the detection and protection device provided by the embodiments of the present invention. Referring to Figure 1 In the first aspect of the present invention, an embodiment provides a detection and protection device for a power line. The power line includes a first current-carrying line 110, a second current-carrying line 120, a first shielding conductor 130 covering the first current-carrying line 110, and a second shielding conductor 140 covering the second current-carrying line 120.

[0054] It can be understood that when the power supply line supplies power to an electrical device using two-phase alternating current, it can be one of the following two situations: the first current-carrying line 110 is the live wire L, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L. When the power supply line supplies power to an electrical device using three-phase alternating current, it can be one of the following three situations: the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L1; the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the live wire L2. Below, taking Figure 1 the situation shown, that is, the situation where the first current-carrying line 110 is the live wire L and the second current-carrying line 120 is the neutral wire N as an example for illustration, the same applies to the other situations.

[0055] Continuing to refer to Figure 1 , the first shielding conductor 130 is used to collect the leakage signal of the first current-carrying line 110, and the second shielding conductor 140 is used to collect the leakage signal of the second current-carrying line 120; the first shielding conductor 130 includes a first end a near the input end of the power supply line and a second end b near the output end of the power supply line; the second shielding conductor 140 includes a fourth end d near the input end and a fifth end e near the output end.

[0056] The detection and protection device includes a self-checking path module, a high-frequency coupling injection module 310, a coupling reception module 320, and a response processing module 400, where:

[0057] The self-checking path module is electrically connected to the first current-carrying line 110, the first shielding conductor 130, the second current-carrying line 120, and the second shielding conductor 140 to construct a high-frequency detection path;

[0058] The high-frequency coupling injection module 310 is used to inject a high-frequency signal into the high-frequency detection path;

[0059] The coupling reception module 320 is used to receive the high-frequency signal from the high-frequency detection path;

[0060] The response processing module 400 is electrically connected to the high-frequency coupling injection module 310 and the coupling reception module 320, and is used to disconnect the power connection between the input end and the output end of the power supply line according to the high-frequency signal in the case where the first shielding conductor 130 is open, the second shielding conductor 140 is open, the first shielding conductor 130 detects a leakage signal, and / or the second shielding conductor 140 detects a leakage signal.

[0061] It can be understood that the detection and protection device further includes a switch module 500 for controlling the power connection between the input end and the output end of the power supply line. Referring to Figure 1As shown, the switch module 500 is provided with switch terminals on the first current-carrying line 110 and the second current-carrying line 120. When the switch terminals of the switch module 500 are closed, the electrical connection between the input end and the output end of the power line is conducted; when the switch terminals of the switch module 500 are opened, the electrical connection between the input end and the output end of the power line is disconnected.

[0062] According to the detection and protection device for a power line provided by an embodiment of the present invention, by using a self-checking path module to cooperate with the first current-carrying line 110, the second current-carrying line 120, the first shielding conductor 130, and the second shielding conductor 140 to form a high-frequency detection path, and injecting a high-frequency signal into the high-frequency detection path. After the high-frequency signal flows through the high-frequency detection path, it is received by the coupling and receiving module 320 and transmitted to the response processing module 400. When there is a leakage or open-circuit situation, the electrical connection between the input end and the output end of the power line is disconnected through the response processing module 400 to ensure the power supply safety of the power line; the detection and protection device for the power line can effectively and reliably realize the leakage detection of the power line and the open-circuit detection of the shielding conductor of the power line.

[0063] Refer to Figure 1 In the detection and protection device provided by some embodiments of the present invention, the self-checking path module includes a first capacitor Zc1 and a second capacitor Zc2. The first capacitor Zc1 is electrically connected to the first current-carrying line 110 and the first shielding conductor 130, and the second capacitor Zc2 is electrically connected to the second current-carrying line 120 and the second shielding conductor 140.

[0064] In this embodiment, the sequentially connected first current-carrying line 110, the first capacitor Zc1, and the first shielding conductor 130 form a separate high-frequency detection path or a part of a high-frequency detection path. Similarly, the sequentially connected second current-carrying line 120, the second capacitor Zc2, and the second shielding conductor 140 form a separate high-frequency detection path or a part of a high-frequency detection path. The first capacitor Zc1 and the second capacitor Zc2, as capacitive impedance devices, can allow high-frequency signals to pass through and block low-frequency signals. Therefore, the first capacitor Zc1 can transfer the high-frequency signal on the first current-carrying line 110 to the first shielding conductor 130, or transfer the high-frequency signal on the first shielding conductor 130 to the first current-carrying line 110; the second capacitor Zc2 can transfer the high-frequency signal on the second current-carrying line 120 to the second shielding conductor 140, or transfer the high-frequency signal on the second shielding conductor 140 to the second current-carrying line 120.

[0065] Refer to Figure 1 and Figure 2 In the detection and protection device provided by some embodiments of the present invention, the self-checking path module further includes a first connecting conductor 210 electrically connecting the first shielding conductor 130 and the second shielding conductor 140.

[0066] In this embodiment, through the first connection conductor 210, the high-frequency detection path formed by the first current-carrying line 110, the first capacitor Zc1, and the first shielding conductor 130 and the high-frequency detection path formed by the second current-carrying line 120, the second capacitor Zc2, and the second shielding conductor 140 can be connected to form an integral high-frequency detection path. Specifically, the self-checking path module includes one of the following situations:

[0067] Situation 1: The first capacitor Zc1 is connected to the first current-carrying line 110 and the second terminal b, the second capacitor Zc2 is connected to the second current-carrying line 120 and the fifth terminal e, and the first connection conductor 210 is connected to the first terminal a and the fourth terminal d; for example, referring to Figure 1 As shown, a complete high-frequency detection path of the first current-carrying line 110 - the first capacitor Zc1 - the second terminal b - the first shielding conductor 130 - the first terminal a - the first connection conductor 210 - the fourth terminal d - the second shielding conductor 140 - the fifth terminal e - the second capacitor Zc2 - the second current-carrying line 120 is formed, and at the same time, open-circuit detection or leakage detection of the first shielding conductor 130 and the second shielding conductor 140 is realized.

[0068] Situation 2: The first capacitor Zc1 is connected to the first current-carrying line 110 and the first terminal a, the second capacitor Zc2 is connected to the second current-carrying line 120 and the fourth terminal d, and the first connection conductor 210 is connected to the second terminal b and the fifth terminal e; for example, referring to Figure 2 As shown, a complete high-frequency detection path of the first current-carrying line 110 - the first capacitor Zc1 - the first terminal a - the first shielding conductor 130 - the second terminal b - the first connection conductor 210 - the fifth terminal e - the second shielding conductor 140 - the fourth terminal d - the second capacitor Zc2 - the second current-carrying line 120 is formed, and at the same time, open-circuit detection or leakage detection of the first shielding conductor 130 and the second shielding conductor 140 is realized.

[0069] Referring to Figure 1 and Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the high-frequency coupling injection module 310 is disposed on one side of the input end of the first current-carrying line 110 close to the power line, and the coupling reception module 320 is disposed on one side of the input end of the second current-carrying line 120 close to the power line.

[0070] In this embodiment, the high-frequency coupling injection module 310 injects a high-frequency signal into the first current-carrying line 110 from the side of the input end of the first current-carrying line 110 close to the power line. The high-frequency signal is transmitted to the first shielding conductor 130 through the first capacitor Zc1. After the high-frequency signal completely flows through the first shielding conductor 130, it is transmitted to the second shielding conductor 140 through the first connection conductor 210. After flowing through the second shielding conductor 140 completely, it is transmitted to the second current-carrying line 120 through the second capacitor Zc2, and finally is received by the coupling receiving module 320 on the side of the input end of the second current-carrying line 120 close to the power line, and is transmitted to the control module 410 to process the received high-frequency signal.

[0071] Referring to Figure 3 , in the detection and protection device provided in another embodiment of the present invention, the first capacitor Zc1 is connected to the first current-carrying line 110 and the second end b; the second capacitor Zc2 is connected to the second current-carrying line 120 and the fifth end e;

[0072] The high-frequency coupling injection module 310 is provided on both the side of the input end of the first current-carrying line 110 close to the power line and the side of the input end of the second current-carrying line 120 close to the power line;

[0073] The coupling receiving module 320 is provided at both the position of the first shielding conductor 130 close to the first end a and the position of the second shielding conductor 140 close to the fourth end d.

[0074] In this embodiment, no conductor is provided to connect the first shielding conductor 130 and the second shielding conductor 140. The first current-carrying line 110, the first capacitor Zc1 and the first shielding conductor 130 connected in sequence constitute a separate high-frequency detection path. The high-frequency coupling injection module 310 provided on the side of the input end of the first current-carrying line 110 close to the power line injects a high-frequency signal into the first current-carrying line 110. The high-frequency signal is transmitted to the first shielding conductor 130 through the first capacitor Zc1. After the high-frequency signal completely flows through the first shielding conductor 130, it is received by the coupling receiving module 320 at the position of the first shielding conductor 130 close to the first end a, and is transmitted to the control module 410 to analyze the received high-frequency signal; similarly, the second current-carrying line 120, the second capacitor Zc2 and the second shielding conductor 140 connected in sequence constitute another separate high-frequency detection path. The high-frequency coupling injection module 310 provided on the side of the input end of the second current-carrying line 120 close to the power line injects a high-frequency signal into the second current-carrying line 120. The high-frequency signal is transmitted to the second shielding conductor 140 through the second capacitor Zc2. After the high-frequency signal completely flows through the second shielding conductor 140, it is received by the coupling receiving module 320 at the position of the second shielding conductor 140 close to the fourth end d, and is transmitted to the control module 410 to process the received high-frequency signal.

[0075] Referring toFigure 4 In the detection and protection device provided in another embodiment of the present invention, a first capacitor Zc1 is connected to a first current-carrying line 110 and a first terminal a; a second capacitor Zc2 is connected to a second current-carrying line 120 and a fourth terminal d;

[0076] The self-checking path module further includes a second connecting conductor 220 connected to a second terminal b and a third connecting conductor 230 connected to a fifth terminal e;

[0077] The high-frequency coupling injection module 310 is provided on one side of the input end of the first current-carrying line 110 close to the power supply line and on one side of the input end of the second current-carrying line 120 close to the power supply line;

[0078] The coupling receiving module 320 is provided on both the second connecting conductor 220 and the third connecting conductor 230.

[0079] In this embodiment, there is also no conductor connecting the first shielding conductor 130 and the second shielding conductor 140. The first current-carrying line 110, the first capacitor Zc1, the first shielding conductor 130, and the second connecting conductor 220 connected in sequence form a separate high-frequency detection path. The high-frequency coupling injection module 310 provided on one side of the input end of the first current-carrying line 110 close to the power supply line injects a high-frequency signal into the first current-carrying line 110. The high-frequency signal is transmitted to the first shielding conductor 130 through the first capacitor Zc1. After the high-frequency signal completely flows through the first shielding conductor 130, it is then transmitted to the second connecting conductor 220 and received by the coupling receiving module 320 provided on the second connecting conductor 220, and then transmitted to the control module 410 to process the received high-frequency signal; the second current-carrying line 120, the second capacitor Zc2, the second shielding conductor 140, and the third connecting conductor 230 connected in sequence form another separate high-frequency detection path. The high-frequency coupling injection module 310 provided on one side of the input end of the second current-carrying line 120 close to the power supply line injects a high-frequency signal into the second current-carrying line 120. The high-frequency signal is transmitted to the second shielding conductor 140 through the second capacitor Zc2. After the high-frequency signal completely flows through the second shielding conductor 140, it is then transmitted to the third connecting conductor 230 and received by the coupling receiving module 320 provided on the third connecting conductor 230, and then transmitted to the control module 410 to process the received high-frequency signal.

[0080] It can be understood that Figure 4 the embodiment shown Figure 3 is different from the embodiment shown in that the connection positions of the first capacitor Zc1 and the second capacitor Zc2 are different, so that the directions of the high-frequency signals flowing through the first shielding conductor 130 and the second shielding conductor 140 are different.

[0081] Referring to Figures 1 to 4, in the detection and protection device provided by another embodiment of the present invention, the response processing module 400 includes a control module 410 and a trigger module 420 connected in sequence;

[0082] The control module 410 is configured to: control the high-frequency coupling injection module 310 to inject a high-frequency signal into the high-frequency detection path, obtain the high-frequency signal received by the coupling reception module 320, and output a trip trigger signal when the phase difference between the injected high-frequency signal and the received high-frequency signal falls within a preset range or no high-frequency signal is received;

[0083] The trigger module 420 is configured to: in response to receiving the trip trigger signal, disconnect the power connection between the input end and the output end of the power line through the switch module 500.

[0084] More specifically, when the first current-carrying line 110 leaks electricity to the first shielding conductor 130, and / or the second current-carrying line 120 leaks electricity to the second shielding conductor 140, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling reception module 320 falls within a preset range, and the preset range is 0° ± 10° or 180° ± 10°.

[0085] It should be noted that after the high-frequency signal passes through the first capacitor Zc1, the phase will change by about 180°; similarly, after the high-frequency signal passes through the second capacitor Zc2, the phase will also change by about 180°.

[0086] Therefore, in Figure 1 and Figure 2 's embodiments, when there is no leakage in the first current-carrying line 110 and the second current-carrying line 120, the phase of the high-frequency signal received by the coupling reception module 320 and the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path should not differ much. When the first current-carrying line 110 leaks electricity to the first shielding conductor 130, it is equivalent to short-circuiting the first capacitor Zc1, and the high-frequency signal on the first current-carrying line 110 can be transmitted from the leakage point to the first shielding conductor 130 without passing through the first capacitor Zc1. At this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling reception module 320 should be about 180°; similarly, when the second current-carrying line 120 leaks electricity to the second shielding conductor 140, it is equivalent to short-circuiting the second capacitor Zc2, and the high-frequency signal on the second shielding conductor 140 can be transmitted from the leakage point to the second current-carrying line 120 without passing through the second capacitor Zc2. At this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling reception module 320 should be about 180°.

[0087] In Figure 3 and Figure 4In the embodiments, when there is no leakage in the first current-carrying line 110 and the second current-carrying line 120, the phase of the high-frequency signal received by the coupling receiving module 320 should be about 180° different from the phase of the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path. When the first current-carrying line 110 leaks electricity to the first shielding conductor 130, it is equivalent to short-circuiting the first capacitor Zc1. The high-frequency signal on the first current-carrying line 110 can be transmitted from the leakage point to the first shielding conductor 130 without passing through the first capacitor Zc1. At this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling receiving module 320 should be about 0°. Similarly, when the second current-carrying line 120 leaks electricity to the second shielding conductor 140, it is equivalent to short-circuiting the second capacitor Zc2. The high-frequency signal on the second current-carrying line 120 can be transmitted from the leakage point to the second shielding conductor 140 without passing through the second capacitor Zc2. At this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling receiving module 320 should be about 0°.

[0088] In the detection and protection device provided in some embodiments of the present invention, when an open circuit occurs in the first shielding conductor 130 and / or the second shielding conductor 140, the coupling receiving module 320 does not receive a high-frequency signal.

[0089] In this embodiment, when an open circuit occurs in the first shielding conductor 130 and / or the second shielding conductor 140, the high-frequency signal injected by the high-frequency coupling injection module 310 cannot flow through the high-frequency detection path completely, and the coupling receiving module 320 cannot receive the high-frequency signal normally as a result.

[0090] Refer to Figures 1 to 5 In the detection and protection device provided in some embodiments of the present invention, there is also a DC power supply module 800, and the DC power supply module 800 is used to supply power to at least one of the high-frequency coupling injection module 310, the coupling receiving module 320, the control module 410, and the trigger module 420.

[0091] In this embodiment, the DC power supply module 800 can convert the alternating current of the commercial power into low-voltage direct current VCC and supply it to modules such as the high-frequency coupling injection module 310, the coupling receiving module 320, the control module 410, and the trigger module 420 in the detection and protection device.

[0092] Refer to Figures 1 to 5 In the detection and protection device provided in some embodiments of the present invention, there is also a test module 900. The test module 900 includes a test switch TEST electrically connected to the output end of the DC power supply module 800 and the control module 410.

[0093] When the test switch TEST is not pressed, the control module 410 controls the high-frequency coupling injection module 310 to inject a high-frequency signal of the first period into the high-frequency detection path;

[0094] When the test switch TEST is pressed, the control module 410 controls the high-frequency coupling injection module 310 to inject a high-frequency signal of the second period into the high-frequency detection path.

[0095] In this embodiment, when the test switch TEST is pressed, the period of the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path changes from the first period to the second period, making the high-frequency signal significantly different from when the test switch TEST is not pressed; therefore, the control module 410 can determine whether the test switch TEST is pressed according to the period of the high-frequency signal received by the coupling reception module 320.

[0096] Specifically, referring to Figure 5 , the test module 900 includes, in addition to the test switch TEST, a first resistor R1 and a third capacitor C3. The output terminal of the DC power supply module 800 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the test switch TEST, the other end of the test switch TEST is connected to the control module 410 and one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded. By setting the first resistor R1 and the third capacitor C3 for filtering, the interference of the tiny pulse generated when the test switch TEST is pressed can be effectively filtered out, and the control module 410 can receive a stable test trigger signal.

[0097] Referring to Figure 5 , in the detection and protection device provided in another embodiment of the present invention, the trigger module 420 includes a driving module 421, a thyristor trigger module 422, a thyristor Q3, a tripping coil Lx for generating an electromagnetic force to drive the switch module 500 to disconnect the power connection, a first diode D1, and a second diode D2; the driving module 421 includes an optocoupler U1, a third diode D3, a second resistor R2, a second capacitor C2, and a zener diode ZD1; the thyristor trigger module 422 includes a twelfth resistor R12, a thirteenth resistor R13, and a first capacitor C1; specifically:

[0098] The output terminal of the control module 410 is connected to the input terminal of the optocoupler U1 to output a trip trigger signal to the optocoupler U1. The first current-carrying line 110 is connected to the anode of the third diode D3. The cathode of the third diode D3 is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to one end of the second capacitor C2, the anode of the voltage regulator diode ZD1, and one output terminal of the optocoupler U1. The other output terminal of the optocoupler U1 is connected to one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is respectively connected to one end of the thirteenth resistor R13, one end of the first capacitor C1, and the control electrode of the thyristor Q3;

[0099] The first current-carrying line 110 is connected to one end of the trip coil Lx. The other end of the trip coil Lx is connected to the anode of the thyristor Q3 and the cathode of the second diode D2. The anode of the second diode D2, the cathode of the thyristor Q3, the other end of the first capacitor C1, the other end of the thirteenth resistor R13, the other end of the second capacitor C2, and the cathode of the voltage regulator diode ZD1 are all connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the second current-carrying line 120.

[0100] In this embodiment, after the input terminal of the optocoupler U1 receives the trip trigger signal, the two output terminals of the optocoupler U1 are turned on, generating a current flowing from the first current-carrying line 110 through the third diode D3, the second resistor R2, the optocoupler U1 to the twelfth resistor R12 in the thyristor trigger module 422, thereby charging the first capacitor C1. The potential of the control electrode of the thyristor Q3 rises. When the positive half-cycle of the AC power supply arrives, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q3 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the second current-carrying line 120; the trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 500 to disconnect the power connection between the input terminal and the output terminal of the power line.

[0101] Refer to Figure 5 In the detection and protection device provided in some embodiments of the present invention, the trigger module 420 further includes a first varistor ZR1 connected in parallel with the thyristor Q3. It can be understood that a varistor is a resistor device with non-linear volt-ampere characteristics, mainly used for voltage clamping when the circuit withstands overvoltage and absorbing excess current to protect sensitive components. Therefore, setting the first varistor ZR1 in parallel with the thyristor Q3 can protect the thyristor Q3 from being easily damaged.

[0102] Refer to Figure 5 In the detection and protection device provided in some embodiments of the present invention, it further includes an indication module 600 connected in parallel with the thyristor Q3. The indication module 600 includes an eleventh resistor R11, a tenth resistor R10, and a light-emitting diode LED1 connected in series.

[0103] Reference Figure 5 Figure 5 , in the detection and protection device provided in some embodiments of the present invention, a lightning protection module 700 is further included. The lightning protection module 700 includes a second varistor ZR2, and both ends of the second varistor ZR2 are respectively connected to the first current-carrying line 110 and the second current-carrying line 120. It can be understood that a varistor is a resistor device with non-linear volt-ampere characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive components. Therefore, by setting the second varistor ZR2 before the first current-carrying line 110 and the second current-carrying line 120, the subsequent components in the detection and protection device can be protected from being damaged by lightning voltage.

[0104] The following combines Figure 6 to introduce the operation of the detection and protection device provided in the embodiments of the present invention:

[0105] Step S601: Start;

[0106] Step S602: Determine whether the test switch TEST is pressed; if not, jump to step S603; if so, jump to step S604;

[0107] Step S603: The control module 410 controls the high-frequency coupling injection module 310 to inject a high-frequency signal of the first period into the high-frequency detection path; jump to step S605;

[0108] Step S604: The control module 410 controls the high-frequency coupling injection module 310 to inject a high-frequency signal of the second period into the high-frequency detection path; jump to step S605;

[0109] Step S605: The control module 410 acquires the high-frequency signal received by the coupling reception module 320; if the phase difference between the received high-frequency signal and the injected high-frequency signal falls within the preset range 1, jump to step S606; if the phase difference between the received high-frequency signal and the injected high-frequency signal falls within the preset range 2, jump to step S607; if no high-frequency signal is received, jump to step S608;

[0110] Step S606: Determine that there is no fault; jump to step S602;

[0111] Step S607: Determine that there is a leakage in the power line; jump to step S609;

[0112] Step S608: Determine that there is an open circuit in the shield conductor of the power line; jump to step S609;

[0113] Step S609: Disconnect the power connection between the input end and the output end of the power line through the switch module 500; jump to step S610;

[0114] Step S610: End.

[0115] The detection and protection device for the power cord provided by the embodiment of the present invention forms a high-frequency detection path by using a self-checking path module in cooperation with a first current-carrying line 110, a second current-carrying line 120, a first shielding conductor 130, and a second shielding conductor 140, and injects a high-frequency signal into the high-frequency detection path. After the high-frequency signal flows through the high-frequency detection path, it is received by the coupling reception module 320 and transmitted to the response processing module 400. The response processing module 400 determines whether there is a leakage or open circuit situation according to the phase difference between the received high-frequency signal and the injected high-frequency signal, and disconnects the power connection between the input end and the output end of the power cord through the response processing module 400 to ensure the power supply safety of the power cord. The detection and protection device for the power cord can effectively and reliably implement the leakage detection of the power cord and the open circuit detection of the shielding conductor of the power cord.

[0116] Referring to Figure 7 , the second aspect embodiment of the present invention provides an electrical connection device 1000, which includes the detection and protection device of the first aspect embodiment as above, a housing 1010, and a power cord. The power cord is connected to the housing 1010, and the response processing module 400 is arranged in the housing.

[0117] In addition, the third aspect embodiment of the present invention provides an electrical equipment, which includes a load device and the electrical connection device 1000 of the second aspect embodiment as above, and the output end of the power cord is connected to the load device.

[0118] The above has described the embodiments of the present invention in detail with reference to the drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. A detection and protection device for a power line, characterized in that: The power line includes a first current-carrying line, a second current-carrying line, a first shielding conductor covering the first current-carrying line, and a second shielding conductor covering the second current-carrying line, and the detection protection device includes: a self-test path module electrically connecting the first current-carrying line, the first shielding conductor, the second current-carrying line and the second shielding conductor to construct a high-frequency test path; A high-frequency coupling injection module, used for injecting a high-frequency signal into the high-frequency detection path; A coupled receiving module, configured to receive a high frequency signal from the high frequency detection path; A response processing module is electrically connected to the high-frequency coupling injection module and the coupling receiving module, and is used to disconnect the power connection between the input end and the output end of the power line according to the high-frequency signal when the first shielding conductor is open-circuited, the second shielding conductor is open-circuited, the first shielding conductor detects a leakage signal, and / or the second shielding conductor detects a leakage signal.

2. The detection and protection device according to claim 1, characterized in that: The self-test path module includes a first capacitor and a second capacitor, wherein the first capacitor is electrically connected to the first current-carrying line and the first shielding conductor, and the second capacitor is electrically connected to the second current-carrying line and the second shielding conductor.

3. The detection and protection device according to claim 2, characterized in that: The first shielding conductor includes a first end close to the input end of the power line and a second end close to the output end of the power line; the second shielding conductor includes a fourth end close to the input end of the power line and a fifth end close to the output end of the power line.

4. The detection and protection device according to claim 3, characterized in that: The self-test path module further includes a first connecting conductor electrically connecting the first shielding conductor and the second shielding conductor.

5. The detection and protection device according to claim 4, characterized in that: The self-check path module includes one of the following situations: Case 1: the first capacitor is connected to the first current-carrying line and the second end, the second capacitor is connected to the second current-carrying line and the fifth end, and the first connecting conductor is connected to the first end and the fourth end; Case 2: the first capacitor is connected to the first current-carrying line and the first end, the second capacitor is connected to the second current-carrying line and the fourth end, and the first connecting conductor is connected to the second end and the fifth end.

6. The detection and protection device according to claim 5, characterized in that: The high-frequency coupling injection module is arranged on a side of the first current-carrying line close to the input end of the power line, and the coupling receiving module is arranged on a side of the second current-carrying line close to the input end of the power line.

7. The detection and protection device according to claim 3, characterized in that: The first capacitor is connected to the first current-carrying line and the second end; the second capacitor is connected to the second current-carrying line and the fifth end; The high-frequency coupling injection module is disposed on one side of the first current-carrying line close to the input end of the power line and on one side of the second current-carrying line close to the input end of the power line; The coupling receiving module is disposed at a position of the first shielding conductor close to the first end and at a position of the second shielding conductor close to the fourth end.

8. The detection and protection device according to claim 3, characterized in that: The first capacitor is connected to the first current-carrying line and the first end; the second capacitor is connected to the second current-carrying line and the fourth end; The self-test path module further includes a second connecting conductor connected to the second end and a third connecting conductor connected to the fifth end; The high-frequency coupling injection module is disposed on one side of the first current-carrying line close to the input end of the power line and on one side of the second current-carrying line close to the input end of the power line; The coupling receiving module is disposed on both the second connecting conductor and the third connecting conductor.

9. The detection and protection device according to claim 1, characterized in that: The response processing module includes a control module and a trigger module connected in sequence; The control module is used to: control the high-frequency coupling injection module to inject a high-frequency signal into the high-frequency detection path, obtain the high-frequency signal received by the coupling receiving module, and output a trip trigger signal when the phase difference between the injected high-frequency signal and the received high-frequency signal falls within a preset range or no high-frequency signal is received; The trigger module is configured to disconnect the power connection between the input end and the output end of the power line through the switch module in response to receiving the trip trigger signal.

10. The detection and protection device according to claim 9, characterized in that: When the first current-carrying line leaks electricity to the first shielding conductor, and / or the second current-carrying line leaks electricity to the second shielding conductor, the phase difference between the high-frequency signal injected into the high-frequency detection path by the high-frequency coupling injection module and the high-frequency signal received by the coupling receiving module falls within a preset range, and the preset range is 0°±10° or 180°±10°.

11. The detection and protection device according to claim 9, characterized in that: When the first shielding conductor and / or the second shielding conductor is open-circuited, the coupling receiving module does not receive the high-frequency signal.

12. The detection and protection device according to claim 9, characterized in that: It also includes a direct current power supply module, which is used to supply power to at least one of the high-frequency coupling injection module, the coupling receiving module, the control module and the trigger module.

13. The detection and protection device according to claim 12, characterized in that: It also includes a test module, the test module includes a test switch electrically connected to the output end of the DC power supply module and the control module; When the test switch is not pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of a first period into the high-frequency detection path; When the test switch is pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of a second period into the high-frequency detection path.

14. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 1 to 13, a shell and the power cord, wherein the power cord is connected to the shell, and the response processing module is arranged in the shell.

15. An electrical equipment, characterized in that: The device comprises a load device and the electrical connection device according to claim 14, wherein the output end of the power line is connected to the load device.

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