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

Abstract

The invention discloses a detection protection device of a power line, electric connection equipment and electric equipment, the 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 second capacitor, a self-checking path module and a response processing module; the second capacitor is electrically connected with one end of the first shielding conductor and one end of the second shielding conductor through the self-checking path module, and the other end of the first shielding conductor and the other end of the second shielding conductor are electrically connected with the first current-carrying wire or the second current-carrying wire through the self-checking path module; the response processing module is used for disconnecting the power connection between the input end and the output end of the power line when an open circuit occurs or an electric leakage signal is detected. Electric leakage detection of the power line and open circuit detection of the shielding conductor of the power line can be effectively and reliably realized.

Description

Technical Field

[0001] The present invention relates to the field of electrical technologies, and in particular, 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. It 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 the leakage current detection line is open.

[0003] How to effectively and reliably implement 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 implement 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 second capacitor, a self-checking path module, and a response processing module, where: The second capacitor is electrically connected between the first current-carrying line and the second current-carrying line; The second capacitor is electrically connected to one end of the first shielding conductor and one end of the second shielding conductor through the self-checking path module, and the other end of the first shielding conductor and the other end of the second shielding conductor are electrically connected to the first current-carrying line or the second current-carrying line through the self-checking path module; The response processing module is electrically connected to the self-checking path module, and is configured to disconnect the power connection between the input end and the output end of the power cord 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. The detection and protection device for a power cord provided by an embodiment of the present invention has at least the following beneficial effects: The first shielding conductor wraps the first current-carrying line so as to collect the leakage signal of the first current-carrying line, and the second shielding conductor wraps the second current-carrying line so as to collect the leakage signal of the second current-carrying line. On this basis, under the voltage provided by the second capacitor, the self-checking path module cooperates with the first shielding conductor and the second shielding conductor to form an open-circuit self-checking path. When a leakage or open-circuit situation occurs, the power connection between the input end and the output end of the power cord is disconnected through the response processing module, ensuring 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.

[0006] According to the detection and protection device provided by some embodiments of the present invention, the self-checking path module includes a first self-checking unit, a second self-checking unit, and a third self-checking unit; the first self-checking unit is electrically connected to the second capacitor and is provided with a first detection end; the second self-checking unit is electrically connected to the first self-checking unit, one end of the first shielding conductor, and one end of the second shielding conductor, and is provided with a second detection end; the third self-checking unit is electrically connected to the other end of the first shielding conductor and the other end of the second shielding conductor; the first self-checking unit and the third self-checking unit are also simultaneously electrically connected to the first current-carrying line or simultaneously electrically connected to the second current-carrying line; The response processing module is electrically connected to the first detection end, the second detection end, the first current-carrying line, and the second current-carrying line.

[0007] In this embodiment, the first self-checking unit, the second self-checking unit, and the third self-checking unit in the self-checking path module cooperate with the first shielding conductor and the second shielding conductor to form an open-circuit self-checking path, and are provided with a first detection end and a second detection end. When there is no leakage or open-circuit situation, the potentials of the first detection end and the second detection end are constant and will not trigger the action of the response processing module; when a leakage or open-circuit situation occurs, the potentials of the first detection end and the second detection end change, which will trigger the action of the response processing module, thereby disconnecting the power connection between the input end and the output end of the power cord, ensuring 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.

[0008] According to the detection and protection device provided by some embodiments of the present invention, it further includes a test module, and the test module includes a test switch and a first resistor, and one end of the test switch is connected to one end of the first resistor; The other end of the test switch is connected to one of the first current-carrying line, the second current-carrying line, and the connection point between the first self-checking unit and the second self-checking unit; The other end of the first resistor is connected to one of the first detection terminal, the second detection terminal, the first shielding conductor, and the second shielding conductor.

[0009] According to the detection and protection device provided by some embodiments of the present invention, the first self-checking unit includes an eighth resistor, a second resistor, and a third resistor connected in sequence; the eighth resistor is connected to the second capacitor, and the connection point of the second resistor and the third resistor serves as the first detection terminal.

[0010] According to the detection and protection device provided by some embodiments of the present invention, the second self-checking unit includes a fourth resistor and a fifth resistor; one end of the fourth resistor is connected to the connection point of the eighth resistor and the second resistor, and the other end is connected to one end of the first shielding conductor, one end of the second shielding conductor, and one end of the fifth resistor; the other end of the fifth resistor serves as the second detection terminal.

[0011] According to the detection and protection device provided by some embodiments of the present invention, the third self-checking unit includes a sixth resistor and a seventh resistor; the other end of the first shielding conductor is connected to one end of the sixth resistor, and the other end of the second shielding conductor is connected to one end of the seventh resistor; the other ends of the sixth resistor and the seventh resistor are simultaneously connected to the first current-carrying line or simultaneously connected to the second current-carrying line.

[0012] According to the detection and protection device provided by some embodiments of the present invention, the third self-checking unit further includes a second diode and a third diode; the other end of the sixth resistor is connected to the anode of the second diode, the other end of the seventh resistor is connected to the anode of the third diode, and the cathodes of the second diode and the third diode are simultaneously connected to the first current-carrying line or simultaneously connected to the second current-carrying line.

[0013] According to the detection and protection device provided by some embodiments of the present invention, it further includes a fourth diode. The second current-carrying line is connected to the anode of the fourth diode, the cathode of the fourth diode is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the first current-carrying line.

[0014] According to the detection and protection device provided by some embodiments of the present invention, the response processing module includes a fault response module and a trigger module. The fault response module is respectively connected to the first detection terminal, the second detection terminal, and the trigger module, and the trigger module is respectively connected to the fault response module, the first current-carrying line, and the second current-carrying line; The fault response module is configured to obtain an open-circuit signal generated when an open circuit occurs in the first shielding conductor and / or the second shielding conductor, and to obtain a leakage signal detected by the first shielding conductor and / or the second shielding conductor, and in response to the open-circuit signal or the leakage signal, output a trip trigger signal; The trigger module is configured to, in response to receiving the trip trigger signal, disconnect the electrical connection between the input end and the output end of the power supply line through the switch module.

[0015] According to the detection and protection device provided by some embodiments of the present invention, the fault response module includes a first triode and a second triode; The base of the first triode and the emitter of the second triode are both connected to the first detection terminal; The emitter of the first triode and the base of the second triode are both connected to the second detection terminal; The collector of the first triode and the collector of the second triode are connected together and connected to the trigger module to output the trip trigger signal to the trigger module.

[0016] 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, a leakage signal is sent to the second triode through the first detection terminal, so that the second triode conducts to output the trip trigger signal to the trigger module.

[0017] 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 an open circuit occurs in the second shielding conductor, an open-circuit signal is sent to the first triode through the second detection terminal, so that the first triode conducts to output the trip trigger signal to the trigger module.

[0018] According to the detection and protection device provided by some embodiments of the present invention, the first triode and the second triode are PNP-type triodes.

[0019] 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 supply line as described in the first aspect embodiment above. The power supply line is connected to the housing, and the second capacitor, the first self-checking unit, the second self-checking unit, and the response processing module are arranged in the housing.

[0020] In a third aspect, an embodiment of the present invention provides an electrical equipment, including a load device and the electrical connection device as described in the second aspect embodiment above. The output end of the power supply line is connected to the load device.

[0021] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification, claims and drawings. Description of the Drawings

[0022] The 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.

[0023] The present invention will be further described below in conjunction with the drawings and embodiments; Figure 1 is the circuit schematic diagram of the detection and protection device provided by the first embodiment of the present invention; Figure 2 is the equivalent circuit of the self-checking path formed by the embodiment of the present invention; Figure 3 is the circuit schematic diagram of the detection and protection device provided by the second embodiment of the present invention; Figure 4 is the schematic diagram of the current signal flow direction in the case of leakage of the first current-carrying line provided by the embodiment of the present invention; Figure 5 is the schematic diagram of the current signal flow direction in the case of leakage of the second current-carrying line provided by the embodiment of the present invention; Figure 6 is the schematic diagram of the current signal flow direction in the case of an open circuit of the first shielding conductor provided by the embodiment of the present invention; Figure 7 is the schematic diagram of the current signal flow direction in the case of an open circuit of the second shielding conductor provided by the embodiment of the present invention; Figure 8 is the schematic diagram of the current signal flow direction in the case where the test switch is pressed provided by the embodiment of the present invention; Figure 9 is the structural schematic diagram of the electrical connection device provided by the embodiment of the present invention. Detailed Embodiments

[0024] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to visually and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be construed as a limitation to the protection scope of the present invention.

[0025] In the description of the embodiments of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, "greater than", "less than", "exceeding", etc. are understood as not including the original number, "above", "below", "within", etc. are understood as including the original number, "at least one" means one or more, and "at least one of the following" and its similar expressions mean 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.

[0026] It should be noted that words such as "set", "installed", "connected", etc. in the embodiments of the present invention should be understood in a broad sense, and 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 "connected" 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.

[0027] 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.

[0028] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It 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 circuit detector interrupter has also put forward higher safety detection requirements. For example, it is necessary to detect whether there is an open circuit in the leakage current detection line. 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.

[0029] Based on this, the embodiments of the present invention 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.

[0030] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0031] Figure 1 is the circuit schematic diagram of the detection and protection device provided by the embodiments of the present invention. Refer to Figure 1, an embodiment of the first aspect of the present invention provides a detection and protection device for a power cord. The power cord includes a first current-carrying wire 110, a second current-carrying wire 120, a first shielding conductor 130 covering the first current-carrying wire 110, and a second shielding conductor 140 covering the second current-carrying wire 120.

[0032] It can be understood that when the power cord supplies power to an electrical device using two-phase alternating current, it can be one of the following two situations: the first current-carrying wire 110 is the live wire L, and the second current-carrying wire 120 is the neutral wire N; the first current-carrying wire 110 is the neutral wire N, and the second current-carrying wire 120 is the live wire L. When the power cord supplies power to an electrical device using three-phase alternating current, it can be one of the following three situations: the first current-carrying wire 110 is the live wire L1, and the second current-carrying wire 120 is the neutral wire N; the first current-carrying wire 110 is the neutral wire N, and the second current-carrying wire 120 is the live wire L1; the first current-carrying wire 110 is the live wire L1, and the second current-carrying wire 120 is the live wire L2. Below, taking Figure 1 the situation shown, that is, the situation where the first current-carrying wire 110 is the live wire L and the second current-carrying wire 120 is the neutral wire N as an example for illustration, and the same applies to the other situations.

[0033] Continue to refer to Figure 1 , the first shielding conductor 130 is used to collect the leakage signal of the first current-carrying wire 110, and the second shielding conductor 140 is used to collect the leakage signal of the second current-carrying wire 120; the first shielding conductor 130 includes a first end a near the input end of the power cord and a second end b near the output end of the power cord; the second shielding conductor 140 includes a fourth end d near the input end and a fifth end e near the output end.

[0034] The detection and protection device includes a second capacitor C2, a self-checking path module, and a response processing module, where: The second capacitor C2 is electrically connected between the first current-carrying wire 110 and the second current-carrying wire 120; The second capacitor C2 is electrically connected to one end of the first shielding conductor 130 and one end of the second shielding conductor 140 through the self-checking path module, and the other ends of the first shielding conductor 130 and the second shielding conductor 140 are electrically connected to the first current-carrying wire 110 or the second current-carrying wire 120 through the self-checking path module; The response processing module is electrically connected to the self-checking path module, and is used to disconnect the power connection between the input end and the output end of the power cord when an open circuit occurs in the first shielding conductor 130, an open circuit occurs in the second shielding conductor 140, a leakage signal is detected by the first shielding conductor 130, or a leakage signal is detected by the second shielding conductor 140.

[0035] According to the detection and protection device for a power cord provided by an embodiment of the present invention, a first shielding conductor 130 wraps around a first current-carrying line 110 so as to collect the leakage signal of the first current-carrying line 110, and a second shielding conductor 140 wraps around a second current-carrying line 120 so as to collect the leakage signal of the second current-carrying line 120. On this basis, under the voltage provided by a second capacitor C2, a self-check path module cooperates with the first shielding conductor 130 and the second shielding conductor 140 to form a self-check path. When a leakage situation or an open-circuit situation occurs, the power connection between the input end and the output end of the power cord is disconnected through a response processing module, ensuring the power supply safety of the power cord; the detection and protection device for the power cord 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.

[0036] Referring to Figure 1 , in the detection and protection device provided by some embodiments of the present invention, the self-check path module includes a first self-check unit 210, a second self-check unit 220, and a third self-check unit 230; the first self-check unit 210 is electrically connected to the second capacitor C2 and is provided with a first detection end X; the second self-check unit 220 is electrically connected to the first self-check unit 210, one end of the first shielding conductor 130, and one end of the second shielding conductor 140. Specifically, the second self-check unit 220 is electrically connected to a first end a of the first shielding conductor 130 close to the input end of the power cord and is electrically connected to a fourth end d of the second shielding conductor 140 close to the input end of the power cord, and the second self-check unit 220 is provided with a second detection end Y; the third self-check unit 230 is electrically connected to the other end of the first shielding conductor 130 and the other end of the second shielding conductor 140. Specifically, the third self-check unit 230 is electrically connected to a second end b of the first shielding conductor 130 close to the output end of the power cord and is electrically connected to a fifth end e of the second shielding conductor 140 close to the output end of the power cord; in Figure 1 the embodiment, the first self-check unit 210 and the third self-check unit 230 are also simultaneously electrically connected to the first current-carrying line 110; The response processing module is electrically connected to the first detection end X, the second detection end Y, the first current-carrying line 110, and the second current-carrying line 120.

[0037] 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 cord. Referring to Figure 1 as 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 power connection between the input end and the output end of the power cord is conducted; when the switch terminals of the switch module 500 are opened, the power connection between the input end and the output end of the power cord is disconnected.

[0038] In this embodiment, the first self-check unit 210, the second self-check unit 220, and the third self-check unit 230 in the self-check path module cooperate with the first shielding conductor 130 and the second shielding conductor 140 to form an open-circuit self-check path, and are provided with a first detection end X and a second detection end Y. When there is no leakage or open-circuit situation, the potentials of the first detection end X and the second detection end Y are constant and will not trigger the response processing module to act; when there is a leakage or open-circuit situation, the potentials of the first detection end X and the second detection end Y change, which will trigger the response processing module to act, thereby disconnecting the power connection between the input end and the output end of the power line and ensuring the power supply safety of the power line; the detection and protection device of the power line can effectively and reliably detect the leakage of the power line and the open circuit of the shielding conductor of the power line.

[0039] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, the first self-check unit 210 includes an eighth resistor R8, a second resistor R2, and a third resistor R3 connected in sequence; the eighth resistor R8 is connected to the second capacitor C2, and the connection point of the second resistor R2 and the third resistor R3 serves as the first detection end X.

[0040] In this embodiment, the voltages between the second capacitor C2 and the first current-carrying line 110 are divided by the eighth resistor R8, the second resistor R2, and the third resistor R3 in the first self-check unit 210 to determine the potential of the first detection end X.

[0041] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, the second self-check unit 220 includes a fourth resistor R4 and a fifth resistor R5; one end of the fourth resistor R4 is connected to the connection point of the eighth resistor R8 and the second resistor R2, and the other end is connected to one end of the first shielding conductor 130, one end of the second shielding conductor 140, and one end of the fifth resistor R5; the other end of the fifth resistor R5 serves as the second detection end Y.

[0042] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, the third self-check unit 230 includes a sixth resistor R6, a seventh resistor R7, a second diode D2, and a third diode D3; both ends of the sixth resistor R6 are respectively connected to the other end of the first shielding conductor 130 and the anode of the second diode D2, and both ends of the seventh resistor R7 are respectively connected to the other end of the second shielding conductor 140 and the anode of the third diode D3; the third resistor R3, the cathode of the second diode D2, and the cathode of the third diode D3 are simultaneously connected to the first current-carrying line 110. Specifically, the equivalent circuit of the self-check path formed by the cooperation of the first self-check unit 210, the second self-check unit 220, and the third self-check unit 230 in the self-check path module with the first shielding conductor 130 and the second shielding conductor 140 is asFigure 2 as shown

[0043] In this embodiment, through the fourth resistor R4 and the fifth resistor R5 in the second self-checking unit 220, the sixth resistor R6, the seventh resistor R7, the second diode D2 and the third diode D3 in the third self-checking unit 230, in cooperation with the first shielding conductor 130 and the second shielding conductor 140, a special detection path is formed, which can realize the detection of the first shielding conductor 130 and the second shielding conductor 140, and can determine the potential of the second detection terminal Y. When a leakage signal is detected in the first shielding conductor 130, a leakage signal is detected in the second shielding conductor 140, the first shielding conductor 130 is open-circuited, or the second shielding conductor 140 is open-circuited, the potential of the first detection terminal X or the second detection terminal Y is affected, thereby triggering the response processing module to act and disconnecting the power connection between the input end and the output end of the power line to ensure the power supply safety of the power line.

[0044] Referring to Figure 3 , in the detection and protection device provided in some embodiments of the present invention, the third self-checking unit 230 includes a sixth resistor R6, a seventh resistor R7, a second diode D2 and a third diode D3; both ends of the sixth resistor R6 are respectively connected to the other end of the first shielding conductor 130 and the anode of the second diode D2, and both ends of the seventh resistor R7 are respectively connected to the other end of the second shielding conductor 140 and the anode of the third diode D3; the third resistor R3, the cathode of the second diode D2 and the cathode of the third diode D3 are simultaneously connected to the second current-carrying line 120.

[0045] It can be understood that the difference between this embodiment and the embodiment Figure 1 shown is only that the cathode of the third resistor R3, the cathode of the second diode D2 and the cathode of the third diode D3 are changed from being connected to the first current-carrying line 110 to being connected to the second current-carrying line 120. The working principle of the detection and protection device in this embodiment is the same as that of the embodiment Figure 1 shown, so the embodiment Figure 1 shown will be taken as an example for subsequent description.

[0046] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, a test module 300 is further included. The test module 300 includes a test switch TEST and a first resistor R1. One end of the test switch TEST is connected to one end of the first resistor R1; the other end of the test switch TEST is connected to the connection point between the first self-checking unit 210 and the second self-checking unit 220, that is, connected to the connection point between the eighth resistor R8 and the second resistor R2; the other end of the first resistor R1 is connected to the first end a of the first shielding conductor 130.

[0047] In this embodiment, when the test switch TEST in the test module 300 is pressed, it is equivalent to connecting the first resistor R1 in parallel across the fourth resistor R4, thereby changing the potential of the second detection terminal Y, triggering the action of the response processing module, and further testing whether the leakage detection function of the detection protection device is intact.

[0048] It can be understood that the other end of the test switch TEST can also be connected to the first current-carrying line 110 or the second current-carrying line 120; the other end of the first resistor R1 can be connected to the first detection terminal X, the second detection terminal Y, or the second shielding conductor 140. The above settings of the test module 300 can all cause the potential of the first detection terminal X or the second detection terminal Y to change, thereby triggering the action of the response processing module to test whether the leakage detection function of the detection protection device is intact.

[0049] Refer to Figure 1 , in the detection protection device provided in some embodiments of the present invention, it further includes a fourth diode D4. The second current-carrying line 120 is connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the first current-carrying line 110.

[0050] In this embodiment, by setting the fourth diode D4, the second capacitor C2 is charged when the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110.

[0051] Refer to Figure 1 , in the detection protection device provided in some embodiments of the present invention, the response processing module includes a fault response module 410 and a trigger module 420. The fault response module 410 is respectively connected to the first detection terminal X, the second detection terminal Y, and the trigger module 420, and the trigger module 420 is respectively connected to the fault response module 410, the first current-carrying line 110, and the second current-carrying line 120; The fault response module 410 is configured to obtain an open-circuit signal generated when an open circuit occurs in the first shielding conductor 130 or the second shielding conductor 140, and obtain a leakage signal detected by the first shielding conductor 130 or the second shielding conductor 140, and output a trip trigger signal in response to the open-circuit signal or the leakage signal; 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 supply line through the switch module.

[0052] Continue to refer to Figure 1 , in the detection protection device provided in some embodiments of the present invention, the fault response module 410 includes a first triode Q1 and a second triode Q2; The base of the first triode Q1 and the emitter of the second triode Q2 are both connected to the first detection terminal X; The emitter of the first triode Q1 and the base of the second triode Q2 are both connected to the second detection terminal Y; The collector of the first triode Q1 and the collector of the second triode Q2 are connected together and connected to the trigger module 420 to output a trip trigger signal to the trigger module 420.

[0053] In this embodiment, when the voltage received by the emitter of the first triode Q1 is greater than the voltage received by the base of the first triode Q1, the emitter junction of the first triode Q1 is forward-biased and thus conducts, and then a trip trigger signal is output to the trigger module 420 through the collector of the first triode Q1; similarly, when the voltage received by the emitter of the second triode Q2 is greater than the voltage received by the base of the second triode Q2, the emitter junction of the second triode Q2 is forward-biased and thus conducts, and then a trip trigger signal is output to the trigger module 420 through the collector of the second triode Q2.

[0054] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 420 includes a thyristor Q3, a first diode D1, a thyristor drive module 421, and a trip coil Lx for generating an electromagnetic force to drive the switch module 500 to disconnect the power connection; the thyristor drive module 421 includes a twelfth resistor R12, a thirteenth resistor R13, and a first capacitor C1. 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, the cathode of the thyristor Q3 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the second current-carrying line 120; the collectors of the first triode Q1 and the second triode Q2 are connected together and 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. The other ends of the thirteenth resistor R13 and the first capacitor C1 are both connected to the connection point between the thyristor Q3 and the first diode D1.

[0055] In this embodiment, when a trip trigger signal is output from the collector of the first triode Q1 or the collector of the second triode Q2 to the thyristor drive module 421, the trip trigger signal charges the first capacitor C1 after passing through the twelfth resistor R12, and the potential of the control electrode of the thyristor Q3 increases. 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 conducts, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q3 - first diode D1 - 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 end and the output end of the power line.

[0056] Reference Figure 1 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 is subjected to overvoltage, absorbing excess current to protect sensitive devices. Therefore, setting the first varistor ZR1 in parallel with the thyristor Q3 can protect the thyristor Q3 from being easily damaged.

[0057] Reference Figure 1 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 fourteenth resistor R14, and a light-emitting diode LED1 connected in series.

[0058] Reference Figure 1 In the detection and protection device provided in some embodiments of the present invention, it further includes a lightning protection module 700. The lightning protection module 700 includes a second varistor ZR2. Two 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 devices. Therefore, setting the second varistor ZR2 before the first current-carrying line 110 and the second current-carrying line 120 can protect the subsequent components in the detection and protection device from being easily damaged by the lightning voltage.

[0059] Next, the operation of the detection and protection device provided in the embodiments of the present invention in various leakage and open-circuit situations will be introduced with the embodiments shown in Figure 1 : 1. When the first current-carrying line 110 leaks electricity to the first shielding conductor 130, a leakage signal is sent to the second triode Q2 through the first detection end X, causing the second triode Q2 to conduct, so as to output a tripping trigger signal to the trigger module 420.

[0060] Specifically, after the first shielding conductor 130 obtains the leakage signal, referring to Figure 4 as shown, on the one hand, the current provided by the second capacitor C2 flows through the eighth resistor R8 and the fourth resistor R4 to the first end a of the first shielding conductor 130 and the fourth end d of the second shielding conductor 140; on the other hand, it flows through the eighth resistor R8 to the second resistor R2 and the third resistor R3 in sequence, and from the first detection end X to the emitter of the second triode Q2, so that the emitter of the second triode Q2 receives a voltage greater than the voltage of the base, causing the second triode Q2 to conduct; there are also other current flow directions as indicated by the Figure 4 arrow; After the second triode Q2 is turned on, current flows through the second triode Q2 and from the collector of the second triode Q2 to the twelfth resistor R12 to charge the first capacitor C1, and the voltage at the control electrode of the thyristor Q3 increases. When it reaches the positive half-cycle of the AC power supply, 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 - trip coil Lx - thyristor Q3 - first diode D1 - 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 end and the output end of the power line.

[0061] 2. When the second current-carrying line 120 leaks electricity to the second shielding conductor 140, a leakage signal is sent to the second triode Q2 through the first detection terminal X, causing the second triode Q2 to be turned on to output a trip trigger signal to the trigger module 420.

[0062] Specifically, after the second shielding conductor 140 obtains this leakage signal, referring to Figure 5 As shown, on the one hand, the current provided by the second capacitor C2 flows through the eighth resistor R8 and the fourth resistor R4 to the first end a of the first shielding conductor 130 and the fourth end d of the second shielding conductor 140; on the other hand, it flows through the eighth resistor R8 to the second resistor R2 and the third resistor R3 in sequence, and from the first detection terminal X to the emitter of the second triode Q2, so that the emitter of the second triode Q2 receives a voltage greater than the voltage of the base, causing the second triode Q2 to be turned on; there are also other current flow directions as indicated by the Figure 5 arrow; After the second triode Q2 is turned on, current flows through the second triode Q2 and from the collector of the second triode Q2 to the twelfth resistor R12 to charge the first capacitor C1, and the voltage at the control electrode of the thyristor Q3 increases. When it reaches the positive half-cycle of the AC power supply, 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 - trip coil Lx - thyristor Q3 - first diode D1 - 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 end and the output end of the power line.

[0063] 3. When an open circuit occurs in the first shielding conductor 130, an open circuit signal is sent to the first triode Q1 through the second detection terminal Y, causing the first triode Q1 to be turned on to output a trip trigger signal to the trigger module 420.

[0064] Specifically, after an open circuit occurs in the first shielding conductor 130, referring to Figure 6As shown, on one hand, the current provided by the second capacitor C2 flows through the eighth resistor R8 and the fourth resistor R4 to the fourth end d of the second shielding conductor 140, and from the fifth resistor R5 to the second detection terminal Y. On the other hand, it flows through the eighth resistor R8 to the second resistor R2 and the third resistor R3 in sequence, causing the voltage received by the emitter of the first triode Q1 to be greater than the voltage of the base, making the first triode Q1 conduct. In addition, there are other current flow directions as shown by the Figure 6 arrow; After the first triode Q1 conducts, the current flows from the second detection terminal Y through the first triode Q1 and from the collector of the first triode Q1 to the twelfth resistor R12 to charge the first capacitor C1, increasing the voltage of the control electrode of the thyristor Q3. When it comes to the positive half-cycle of the AC power supply, 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 conducts, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q3 - first diode D1 - second current-carrying line 120; The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 500 to disconnect the electrical connection between the input end and the output end of the power line.

[0065] 4. When an open circuit occurs in the second shielding conductor 140, an open circuit signal is sent to the first triode Q1 through the second detection terminal Y, making the first triode Q1 conduct to output a trip trigger signal to the trigger module 420.

[0066] Specifically, after an open circuit occurs in the second shielding conductor 140, referring to Figure 7 shown, on one hand, the current provided by the second capacitor C2 flows through the eighth resistor R8 and the fourth resistor R4 to the first end a of the first shielding conductor 130, and from the fifth resistor R5 to the second detection terminal Y. On the other hand, it flows through the eighth resistor R8 to the second resistor R2 and the third resistor R3 in sequence, causing the voltage received by the emitter of the first triode Q1 to be greater than the voltage of the base, making the first triode Q1 conduct. In addition, there are other current flow directions as shown by the Figure 7 arrow; After the first triode Q1 conducts, the current flows from the second detection terminal Y through the first triode Q1 and from the collector of the first triode Q1 to the twelfth resistor R12 to charge the first capacitor C1, increasing the voltage of the control electrode of the thyristor Q3. When it comes to the positive half-cycle of the AC power supply, 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 conducts, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q3 - first diode D1 - second current-carrying line 120; The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 500 to disconnect the electrical connection between the input end and the output end of the power line.

[0067] 5. When the test switch TEST is pressed: A current signal is sent to the first triode Q1 through the second detection terminal Y, causing the first triode Q1 to conduct, so as to output a tripping trigger signal to the trigger module 420.

[0068] Specifically, after the test switch TEST is pressed, referring to Figure 8 As shown, the current provided by the second capacitor C2, on the one hand, flows through the test switch TEST and the first resistor R1 to the first end a of the first shield conductor 130; on the other hand, it flows through the eighth resistor R8 and the fourth resistor R4 to the first end a of the first shield conductor 130, and from the fifth resistor R5 to the second detection terminal Y; on the third hand, it flows through the eighth resistor R8 to the second resistor R2 and the third resistor R3 in sequence; so that the emitter of the first triode Q1 receives a voltage greater than the voltage of the base, causing the first triode Q1 to conduct; in addition, there are other current flows as shown by the Figure 8 arrows; After the first triode Q1 conducts, the current flows from the second detection terminal Y through the first triode Q1 and flows from the collector of the first triode Q1 to the twelfth resistor R12, charging the first capacitor C1, and the voltage of the control electrode of the thyristor Q3 increases. When it reaches the positive half-cycle of the AC power supply, 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 conducts, forming a strong current path of the first current-carrying line 110 - tripping coil Lx - thyristor Q3 - first diode D1 - second current-carrying line 120; The tripping coil Lx generates a strong electromagnetic force, thereby driving the switch module 500 to disconnect the power connection between the input end and the output end of the power line.

[0069] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, the first triode Q1 and the second triode Q2 are PNP type triodes.

[0070] In the detection and protection device for the power line provided by the embodiments of the present invention, under the voltage provided by the second capacitor C2, the first self-check unit 210, the second self-check unit 220, and the third self-check unit 230 in the self-check path module cooperate with the first shield conductor 130 and the second shield conductor 140 to form an open-circuit self-check path, and are provided with a first detection terminal X and a second detection terminal Y. When there is no leakage and open-circuit situation, the potentials of the first detection terminal X and the second detection terminal Y are constant and will not trigger the action of the response processing module; when there is a leakage and open-circuit situation, the potentials of the first detection terminal X and the second detection terminal Y change, then the action of the response processing module will be triggered, thereby disconnecting the power connection between the input end and the output end of the power line, ensuring 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 shield conductor of the power line.

[0071] Referring to Figure 9 , an embodiment of the second aspect of the present invention provides an electrical connection device 800, including the detection and protection device of the above first aspect embodiment, a housing 810, and a power cord. The power cord is connected to the housing 810, and a second capacitor C2, a first self-check unit 210, a second self-check unit 220, and a response processing module are disposed in the housing 810.

[0072] In addition, an embodiment of the third aspect of the present invention provides an electrical equipment, including a load device and the electrical connection device 800 of the above second aspect embodiment, and an output end of the power cord is connected to the load device.

[0073] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by 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 second capacitor electrically connected between the first current-carrying line and the second current-carrying line; A self-test path module, wherein the second capacitor is electrically connected to one end of the first shielding conductor and one end of the second shielding conductor through the self-test path module, and the other end of the first shielding conductor and the other end of the second shielding conductor are electrically connected to the first current-carrying line or the second current-carrying line through the self-test path module; A response processing module is electrically connected to the self-detection path module, and is used to disconnect the power connection between the input end and the output end of the power line 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 self-test unit, a second self-test unit and a third self-test unit; the first self-test unit is electrically connected to the second capacitor and is provided with a first detection end; the second self-test unit is electrically connected to the first self-test unit, one end of the first shielded conductor and one end of the second shielded conductor, and is provided with a second detection end; the third self-test unit is electrically connected to the other end of the first shielded conductor and the other end of the second shielded conductor; the first self-test unit and the third self-test unit are also electrically connected to the first current-carrying line or are electrically connected to the second current-carrying line at the same time; The response processing module is electrically connected to the first detection end, the second detection end, the first current-carrying line, and the second current-carrying line.

3. The detection and protection device according to claim 2, characterized in that: It also includes a test module, the test module includes a test switch and a first resistor, one end of the test switch is connected to one end of the first resistor; The other end of the test switch is connected to one of the first current-carrying line, the second current-carrying line, the connection point of the first self-test unit and the second self-test unit; The other end of the first resistor is connected to one of the first detection end, the second detection end, the first shielding conductor, and the second shielding conductor.

4. The detection and protection device according to claim 2, characterized in that: The first self-check unit includes an eighth resistor, a second resistor and a third resistor connected in sequence; the eighth resistor is connected to the second capacitor, and the connection point between the second resistor and the third resistor serves as the first detection end.

5. The detection and protection device according to claim 4, characterized in that: The second self-test unit includes a fourth resistor and a fifth resistor; one end of the fourth resistor is connected to the connection point between the eighth resistor and the second resistor, and the other end is connected to one end of the first shielding conductor, one end of the second shielding conductor and one end of the fifth resistor; the other end of the fifth resistor serves as the second detection end.

6. The detection and protection device according to claim 4, characterized in that: The third self-test unit includes a sixth resistor and a seventh resistor; the other end of the first shielding conductor is connected to one end of the sixth resistor, and the other end of the second shielding conductor is connected to one end of the seventh resistor; the other end of the sixth resistor and the other end of the seventh resistor are simultaneously connected to the first current-carrying line or simultaneously connected to the second current-carrying line.

7. The detection and protection device according to claim 6, characterized in that: The third self-test unit also includes a second diode and a third diode; the other end of the sixth resistor is connected to the anode of the second diode, the other end of the seventh resistor is connected to the anode of the third diode, and the cathode of the second diode and the cathode of the third diode are simultaneously connected to the first current-carrying line or simultaneously connected to the second current-carrying line.

8. The detection and protection device according to claim 2, characterized in that: It also includes a fourth diode, the second current-carrying line is connected to the anode of the fourth diode, the cathode of the fourth diode is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the first current-carrying line.

9. The detection and protection device according to claim 2, characterized in that: The response processing module includes a fault response module and a trigger module, the fault response module is respectively connected to the first detection end, the second detection end and the trigger module, and the trigger module is respectively connected to the fault response module, the first current-carrying line and the second current-carrying line; The fault response module is used to obtain an open circuit signal generated when the first shielded conductor and / or the second shielded conductor is open circuited, and to obtain a leakage signal detected by the first shielded conductor and / or the second shielded conductor, and to output a trip trigger signal in response to the open circuit signal or the leakage signal; 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: The fault response module includes a first triode and a second triode; The base of the first transistor and the emitter of the second transistor are both connected to the first detection end; The emitter of the first transistor and the base of the second transistor are both connected to the second detection terminal; The collector of the first transistor and the collector of the second transistor are connected together and connected to the trigger module to output the tripping trigger signal to the trigger module.

11. The detection and protection device according to claim 10, 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, a leakage signal is sent to the second transistor through the first detection end, so that the second transistor is turned on to output the tripping trigger signal to the trigger module.

12. The detection and protection device according to claim 10, characterized in that: When the first shielding conductor is open-circuited and / or the second shielding conductor is open-circuited, an open-circuit signal is sent to the first transistor through the second detection end, so that the first transistor is turned on to output the tripping trigger signal to the trigger module.

13. The detection and protection device according to claim 10, characterized in that: The first transistor and the second transistor are PNP transistors.

14. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 2 to 13, a shell and the power cord, the power cord is connected to the shell, and the second capacitor, the first self-test unit, the second self-test unit and the response processing module are 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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