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. The detection protection device comprises a self-checking path module and a response processing module, the first current-carrying wire is electrically connected with the first shielding conductor and the second shielding conductor through the self-checking path module, and the first shielding conductor is electrically connected with the second shielding conductor 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 device. 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 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 solve at least 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 device, 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, where 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 and a response processing module, where: The first current-carrying line is electrically connected to the first shielding conductor and the second shielding conductor through the self-checking path module, and the first shielding conductor is electrically connected to the second shielding conductor 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 the first shielding conductor is open, the second shielding conductor is open, the first shielding conductor detects a leakage signal, and / or the second shielding conductor detects a leakage signal.

[0006] 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, the self-checking path module cooperates with the first shielding conductor and the second shielding conductor to form a 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.

[0007] According to 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 cord, a second end close to the output end of the power cord, and a third end located between the first end and the second end; the second shielding conductor includes a fourth end close to the input end, a fifth end close to the output end, and a sixth end located between the fourth end and the fifth end; the third end is electrically connected to the fourth end and the fifth end through the self-checking path module.

[0008] 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 between the first current-carrying line and the second current-carrying line, and is provided with a first detection end; the second self-checking unit is electrically connected to the first current-carrying line, the first end, and the second end, and is provided with a second detection end; the third self-checking unit is electrically connected to the third end, the fourth end, and the fifth end; the sixth end is electrically connected to the first self-checking unit; 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 respectively.

[0009] 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.

[0010] The detection and protection device provided according to some embodiments of the present invention further 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 coupled to one of the first current-carrying line and the second current-carrying line; 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.

[0011] For the detection and protection device provided according to some embodiments of the present invention, the first self-check unit includes a second resistor, a third resistor, and a first diode connected in sequence; the second resistor is coupled to the first current-carrying line, and the cathode of the first diode is connected to the second current-carrying line; the connection point between the second resistor and the third resistor serves as the first detection end.

[0012] For the detection and protection device provided according to some embodiments of the present invention, the second self-check unit includes a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; One end of the fourth resistor and one end of the fifth resistor are coupled to the first current-carrying line, The other end of the fourth resistor is connected to one end of the sixth resistor and the first end, The other end of the fifth resistor is connected to one end of the seventh resistor and the second end, The other ends of the sixth resistor and the seventh resistor are connected and serve as the second detection end.

[0013] For the detection and protection device provided according to some embodiments of the present invention, the third self-check unit includes an eighth resistor and a ninth resistor; The third end is connected to one end of the eighth resistor and one end of the ninth resistor; The other end of the eighth resistor is connected to the fourth end; The other end of the ninth resistor is connected to the fifth end, The sixth end is connected to the anode of the first diode.

[0014] For the detection and protection device provided according to some embodiments of the present invention, the first self-check unit further includes a second diode. The connection point between the fifth resistor and the seventh resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the second end; The third self-check unit further includes a third diode. The connection point between the third end and the eighth resistor is connected to the anode of the third diode, and the cathode of the third diode is connected to the fifth end.

[0015] The detection and protection device provided according to some embodiments of the present invention, wherein 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 configured to obtain an open-circuit signal generated when an open circuit occurs in the first shield conductor and / or the second shield conductor, and obtain a leakage signal detected by the first shield conductor and / or the second shield conductor, and output a trip trigger signal in response to the open-circuit signal or the leakage 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.

[0016] The detection and protection device provided according to some embodiments of the present invention, wherein the fault response module includes a first triode. The emitter of the first triode is connected to the second detection end, the base of the first triode is connected to the first detection end, and the collector of the first triode is connected to the trigger module to output the trip trigger signal to the trigger module.

[0017] The detection and protection device provided according to some embodiments of the present invention, wherein the trigger module includes a thyristor, a thyristor drive module and a trip coil for generating an electromagnetic force to drive the switch module to disconnect the electrical connection; the first current-carrying line is connected to one end of the trip coil, the other end of the trip coil is connected to the anode of the thyristor, and the cathode of the thyristor is connected to the anode of the first diode; the thyristor drive module is connected between the collector of the first triode and the control electrode of the thyristor.

[0018] The detection and protection device provided according to some embodiments of the present invention further includes a fourth diode, a fifth diode and a tenth resistor; the anode of the fourth diode is connected to the sixth end, the cathode of the fourth diode is connected to the thyristor drive module; the anode of the fifth diode is connected to the thyristor drive module, the cathode of the fifth diode is connected to one end of the tenth resistor, and the other end of the tenth resistor is coupled to the first current-carrying line.

[0019] The detection and protection device provided according to some embodiments of the present invention, when the first current-carrying line leaks electricity to the first shield conductor, a leakage signal is sent to the first triode through the second detection end, so that the first triode is turned on to output the trip trigger signal to the trigger module.

[0020] According to the detection and protection device provided by some embodiments of the present invention, when the second current-carrying line leaks electricity to the second shielding conductor, the tripping trigger signal is output to the thyristor drive module through the fourth diode.

[0021] According to the detection and protection device provided by some embodiments of the present invention, when an open circuit occurs between the first end and the third end and / or an open circuit occurs between the second end and the third end, an open circuit signal is sent to the first triode through the second detection end, so that the first triode conducts, and the tripping trigger signal is output to the trigger module.

[0022] According to the detection and protection device provided by some embodiments of the present invention, when an open circuit occurs between the fourth end and the sixth end and / or an open circuit occurs between the fifth end and the sixth end, an open circuit signal is sent to the first triode through the second detection end, so that the first triode conducts, and the tripping trigger signal is output to the trigger module.

[0023] According to the detection and protection device provided by some embodiments of the present invention, the first triode is a PNP type triode.

[0024] 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 as described in the first aspect embodiment above. The power cord is connected to the housing, and the first self-check unit, the second self-check unit, and the response processing module are arranged in the housing.

[0025] 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 cord is connected to the load device.

[0026] 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 achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0028] The present invention will be further described below in conjunction with the drawings and embodiments; Figure 1 It is the circuit schematic diagram of the detection and protection device provided by the embodiment of the present invention; Figure 2is the equivalent circuit of the self-checking path formed by the embodiments of the present invention; Figure 3 is a schematic diagram of the current signal flow when the first current-carrying line provided by the embodiments of the present invention has a leakage; Figure 4 is a schematic diagram of the current signal flow when the second current-carrying line provided by the embodiments of the present invention has a leakage; Figure 5 is a schematic diagram of the current signal flow when an open circuit occurs between the first end and the third end of the first shielding conductor provided by the embodiments of the present invention; Figure 6 is a schematic diagram of the current signal flow when an open circuit occurs between the second end and the third end of the first shielding conductor provided by the embodiments of the present invention; Figure 7 is a schematic diagram of the current signal flow when an open circuit occurs between the fourth end and the sixth end of the second shielding conductor provided by the embodiments of the present invention; Figure 8 is a schematic diagram of the current signal flow when an open circuit occurs between the fifth end and the sixth end of the second shielding conductor provided by the embodiments of the present invention; Figure 9 is a schematic diagram of the current signal flow when the test switch provided by the embodiments of the present invention is pressed; Figure 10 is a schematic diagram of the structure of the electrical connection device provided by the embodiments of the present invention. Detailed Embodiments

[0029] 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 function of the drawings is to supplement the description in 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 on the protection scope of the present invention.

[0030] 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 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.

[0031] It should be noted that in the embodiments of the present invention, words such as "setting", "installing", "connecting", etc. 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 "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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The following further elaborates on the embodiments of the present invention with reference to the drawings.

[0036] 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 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.

[0037] 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, and the same applies to the other situations.

[0038] The detection and protection device includes a self-checking path module and a response processing module, where: The first current-carrying line 110 is electrically connected to the first shielding conductor 130 and the second shielding conductor 140 through the self-checking path module, and the first shielding conductor 130 is electrically connected to the second shielding conductor 140 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 supply line 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 in the first shielding conductor 130 and / or a leakage signal is detected in the second shielding conductor 140.

[0039] According to the detection and protection device of the power supply line provided by the embodiment of the present invention, the first shielding conductor 130 covers the first current-carrying line 110 so as to collect the leakage signal of the first current-carrying line 110, and the second shielding conductor 140 covers the second current-carrying line 120 so as to collect the leakage signal of the second current-carrying line 120. On this basis, the self-checking path module cooperates with the first shielding conductor 130 and the second shielding conductor 140 to form a self-checking 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 supply line is disconnected through the response processing module, ensuring the power supply safety of the power supply line; the detection and protection device of the power supply line can effectively and reliably realize the leakage detection of the power supply line and the open circuit detection of the shielding conductor of the power supply line.

[0040] Referring to Figure 1 , in the detection and protection device provided by some embodiments of the present invention, the first shielding conductor 130 includes a first end a close to the input end of the power supply line, a second end b close to the output end of the power supply line, and a third end c located between the first end a and the second end b; the second shielding conductor 140 includes a fourth end d close to the input end, a fifth end e close to the output end, and a sixth end f located between the fourth end d and the fifth end e; the third end c is electrically connected to the fourth end d and the fifth end e through the self-checking path module.

[0041] Referring 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 self-checking unit 210, a second self-checking unit 220, and a third self-checking unit 230; the first self-checking unit 210 is electrically connected between the first current-carrying line 110 and the second current-carrying line 120, and is provided with a first detection end X; the second self-checking unit 220 is electrically connected to the first current-carrying line 110, the first end a, and the second end b, and is provided with a second detection end Y; the third self-checking unit 230 is electrically connected to the third end c, the fourth end d, and the fifth end e; the sixth end f is electrically connected to the first self-checking unit 210; 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 respectively.

[0042] It can be understood that the detection and protection device further includes a switch module 500 for controlling the electrical connection between the input end and the output end of the power supply line. 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 electrical connection between the input end and the output end of the power supply 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 supply line is disconnected.

[0043] In this embodiment, the first self-checking unit 210, the second self-checking unit 220, and the third self-checking unit 230 in the self-checking path module cooperate with the first shielding conductor 130 and the second shielding conductor 140 to form an open-circuit self-checking 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 action of the response processing module; 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 action of the response processing module, thereby disconnecting the electrical connection between the input end and the output end of the power supply line and ensuring the power supply safety of the power supply line; the detection and protection device of the power supply line can effectively and reliably realize the leakage detection of the power supply line and the open-circuit detection of the shielding conductor of the power supply line.

[0044] Referring to Figure 1 , in the detection and protection device provided by some embodiments of the present invention, the first self-checking unit 210 includes a second resistor R2, a third resistor R3, and a first diode D1 connected in sequence; the second resistor R2 is coupled to the first current-carrying line 110, and the cathode of the first diode D1 is connected to the second current-carrying line 120; the connection point between the second resistor R2 and the third resistor R3 is used as the first detection end X.

[0045] In this embodiment, the voltage between the first current-carrying line 110 and the second current-carrying line 120 is divided by the second resistor R2 and the third resistor R3 in the first self-checking unit 210 to determine the potential of the first detection terminal X; and the first diode D1 is provided to limit the current flow direction to be the first current-carrying line 110 - the second resistor R2 - the third resistor R3 - the first diode D1 - the second current-carrying line 120.

[0046] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, according to the detection and protection device provided in some embodiments of the present invention, the second self-checking unit 220 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a second diode D2; one end of the fourth resistor R4 and one end of the fifth resistor R5 are coupled to the first current-carrying line 110, the other end of the fourth resistor R4 is connected to one end and the first terminal a of the sixth resistor R6, the other end of the fifth resistor R5 is connected to one end of the seventh resistor R7 and the anode of the second diode D2, the cathode of the second diode D2 is connected to the second terminal b, and the other ends of the sixth resistor R6 and the seventh resistor R7 are connected and used as the second detection terminal Y.

[0047] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, the third self-checking unit 230 includes an eighth resistor R8, a ninth resistor R9, and a third diode D3; the third terminal c is connected to one end of the eighth resistor R8 and the anode of the third diode D3, the cathode of the third diode D3 is connected to one end of the ninth resistor R9; the other end of the eighth resistor R8 is connected to the fourth terminal d; the other end of the ninth resistor R9 is connected to the fifth terminal e, and the sixth terminal f is connected to the anode of the first diode D1. Specifically, the equivalent circuit of the self-checking path formed by the first self-checking unit 210, the second self-checking unit 220, and the third self-checking unit 230 in the self-checking path module cooperating with the first shielding conductor 130 and the second shielding conductor 140 is as Figure 2 shown.

[0048] In this embodiment, through the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 in the second self-checking unit 220, and the eighth resistor R8 and the ninth resistor R9 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 multiple segments of the first shielding conductor 130 and the second shielding conductor 140 respectively, and can adjust the potential of the second detection terminal Y, so as to determine the final potential of the second detection terminal Y, and realize that when a leakage signal is detected in the first shielding conductor 130, a leakage signal is detected in the second shielding conductor 140, an open circuit occurs between the first end a and the third end c in the first shielding conductor 130, an open circuit occurs between the second end b and the third end c in the first shielding conductor 130, an open circuit occurs between the fourth end d and the sixth end f in the second shielding conductor 140, and an open circuit occurs between the fifth end e and the sixth end f in the second shielding conductor 140, the potential of the first detection terminal X or the second detection terminal Y is affected, thereby triggering the response processing module to act, 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.

[0049] 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 coupled to the first current-carrying line 110; the other end of the first resistor R1 is connected to the first end a of the first shielding conductor 130.

[0050] In this embodiment, when the test switch TEST in the test module 300 is pressed, it is equivalent to connecting the first current-carrying line 110 to the first shielding conductor 130 through the first resistor R1, that is, simulating the leakage signal of the first current-carrying line 110 being transmitted to the first shielding conductor 130, so as to test whether the leakage detection function of the detection and protection device is intact.

[0051] It can be understood that the other end of the test switch TEST can also be coupled to 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 response processing module to act to test whether the leakage detection function of the detection and protection device is intact.

[0052] Referring to Figure 1, in the detection and protection device provided by 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 end X, the second detection end Y, and the trigger module 420. 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 used to obtain the open-circuit signal generated when the first shield conductor 130 and / or the second shield conductor 140 are open-circuited, and obtain the leakage signal detected by the first shield conductor 130 and / or the second shield 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 line through the switch module 500.

[0053] Refer to Figure 1 , in the detection and protection device provided by some embodiments of the present invention, the fault response module 410 includes a first triode Q1. The emitter of the first triode Q1 is connected to the second detection end Y, the base of the first triode Q1 is connected to the first detection end X, and the collector of the first triode Q1 is connected to the trigger module 420 to output a trip trigger signal to the trigger module 420.

[0054] 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.

[0055] Refer to Figure 1 , in the detection and protection device provided by some embodiments of the present invention, the trigger module 420 includes a thyristor Q3, 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 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 thyristor Q3 is connected to the anode of the first diode D1; the thyristor drive module 421 is connected between the collector of the first triode Q1 and the control electrode of the thyristor Q3. Specifically, the thyristor drive module 421 includes a twelfth resistor R12, a thirteenth resistor R13, and a first capacitor C1. The collector of the first triode Q1 is connected to one end of the twelfth resistor R12, and 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 In this embodiment, when a tripping trigger signal is output from the collector of the first triode Q1 to the thyristor drive module 421, the tripping 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 rises. 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.

[0056] Referring to 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 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.

[0057] Referring to 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] Referring to 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, 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 and absorbing excess current to protect sensitive components. 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] Referring to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, it further includes a fourth diode D4, a fifth diode D5, and a tenth resistor R10; the anode of the fourth diode D4 is connected to the sixth terminal f, the cathode of the fourth diode D4 is connected to the thyristor drive module 421; the anode of the fifth diode D5 is connected to the thyristor drive module 421, the cathode of the fifth diode D5 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is coupled to the first current-carrying line 110.

[0060] In this embodiment, by setting the fourth diode D4, a current branch flowing unidirectionally from the sixth end f of the second shielding conductor 140 to the thyristor drive module 421 is formed as a supplementary detection path.

[0061] Refer to Figure 1 , in the detection and protection device provided in some embodiments of the present invention, a sixth diode D6 is further included. The cathode of the light-emitting diode LED1, one end of the first varistor ZR1, the anode of the fifth diode D5, the cathode of the thyristor Q3, the other end of the thirteenth resistor R13, and the other end of the first capacitor C1 are all connected to the anode of the sixth diode D6, and the cathode of the sixth diode D6 is connected to the anode of the first diode D1.

[0062] In this embodiment, by setting the sixth diode D6, the currents at the cathode of the light-emitting diode LED1, one end of the first varistor ZR1, the anode of the fifth diode D5, the cathode of the thyristor Q3, the other end of the thirteenth resistor R13, and the other end of the first capacitor C1 can only flow unidirectionally to the anode of the first diode D1.

[0063] Next, take Figure 1 The following embodiments are used to introduce the operation of the detection and protection device provided in the embodiments of the present invention under various leakage and open-circuit conditions: 1. When the first current-carrying line 110 leaks electricity to the first shielding conductor 130, a leakage 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.

[0064] Specifically, after the first shielding conductor 130 obtains this leakage signal, refer to Figure 3 As shown, on the one hand, it flows from the first end a to the fourth resistor R4, and then from the fourth resistor R4 to the second resistor R2, the third resistor R3, and the first diode D1 in sequence. On the other hand, it also flows from the first end a to the sixth resistor R6, and then from the sixth resistor R6 to the second detection terminal Y, so that the emitter of the first triode Q1 receives a voltage greater than the base voltage, causing the first triode Q1 to conduct; there are also other current flows as shown by the Figure 3 arrows; After the first triode Q1 conducts, the leakage signal flows through the first triode Q1 and flows from the collector of the first triode Q1 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 conducts, forming a strong current path of the first current-carrying line 110 - tripping coil Lx - thyristor Q3 - sixth diode D6 - 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.

[0065] 2. When the second current-carrying line 120 leaks electricity to the second shielding conductor 140, a trip trigger signal is output to the thyristor drive module 421 through the fourth diode D4.

[0066] Specifically, after the second shielding conductor 140 obtains the leakage signal, referring to Figure 4 As shown, the current provided by the second current-carrying line 120 flows from the sixth terminal f to the anode of the fourth diode D4, and then from the cathode of the fourth diode D4 to the twelfth resistor R12 to charge the first capacitor C1, and the voltage of the control electrode of the thyristor Q3 increases. In addition, there are other current flows as indicated by the Figure 4 arrow; 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 - trip coil Lx - thyristor Q3 - sixth diode D6 - 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.

[0067] 3. When an open circuit occurs between the first terminal a and the third terminal c, an open circuit 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 trip trigger signal to the trigger module 420.

[0068] Specifically, after an open circuit occurs between the first terminal a and the third terminal c of the first shielding conductor 130, referring to Figure 5 As shown, on the one hand, the current provided by the first current-carrying line 110 flows through the second resistor R2, the third resistor R3 and the first diode D1 in sequence, and on the other hand, it flows through the fourth resistor R4 and the sixth resistor R6 to the second detection terminal Y, but cannot flow to the third terminal c of the first shielding conductor 130, causing the emitter of the first triode Q1 to receive a voltage greater than the base voltage, causing the first triode Q1 to conduct; in addition, there are other current flows as indicated by the Figure 5 arrow; After the first triode Q1 is turned on, 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, 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 - sixth diode D6 - 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.

[0069] 4. When an open circuit occurs between the second terminal b and the third terminal c, Specifically, after an open circuit occurs between the second terminal b and the third terminal c of the first shield conductor 130, referring to Figure 6 As shown, the current provided by the first current-carrying line 110 flows through the second resistor R2, the third resistor R3, and the first diode D1 in one aspect; in the second aspect, it flows through the fourth resistor R4 and the sixth resistor R6 to the second detection terminal Y; in the third aspect, it flows through the fifth resistor R5 and the seventh resistor R7 to the second detection terminal Y but cannot flow to the third terminal c of the first shield conductor 130, causing the voltage received by the emitter of the first triode Q1 to be greater than the voltage of the base, turning on the first triode Q1; there are also other current flow directions as shown by the Figure 6 arrow; After the first triode Q1 is turned on, 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, 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 - sixth diode D6 - first diode D1 - second current-carrying line 120; 5. When an open circuit occurs between the fourth terminal d and the sixth terminal f, an open-circuit signal is sent to the first triode Q1 through the second detection terminal Y, turning on the first triode Q1 to output a trip trigger signal to the trigger module 420.

[0070] Specifically, after an open circuit occurs between the fourth terminal d and the sixth terminal f of the second shield conductor 140, referring to Figure 7As shown, the current provided by the first current-carrying line 110 flows through the second resistor R2, the third resistor R3, and the first diode D1 in sequence on the one hand, and on the other hand, it flows through the fourth resistor R4 and the sixth resistor R6 to the second detection terminal Y, through the fifth resistor R5 and the seventh resistor R7 to the second detection terminal Y, and flows to the third terminal c of the first shielding conductor 130. Then, after passing through the third diode D3 and the ninth resistor R9, it flows from the sixth terminal f of the second shielding conductor 140 to the first diode D1; 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 7 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 to charge the first capacitor C1, and the voltage 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 - the trip coil Lx - the thyristor Q3 - the sixth diode D6 - 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 end and the output end of the power line.

[0071] 6. When an open circuit occurs between the fifth terminal e and the sixth terminal f, an open circuit 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 trip trigger signal to the trigger module 420.

[0072] Specifically, after an open circuit occurs between the fifth terminal e and the sixth terminal f of the second shielding conductor 140, referring to Figure 8 As shown, the current provided by the first current-carrying line 110 flows through the second resistor R2, the third resistor R3, and the first diode D1 in sequence on the one hand, and on the other hand, it flows through the fourth resistor R4 and the sixth resistor R6 to the second detection terminal Y, through the fifth resistor R5 and the seventh resistor R7 to the second detection terminal Y, and flows to the third terminal c of the first shielding conductor 130. Then, after passing through the eighth resistor R8, it flows from the sixth terminal f of the second shielding conductor 140 to the first diode D1; 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 is turned on, 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 to charge the first capacitor C1. 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 - sixth diode D6 - 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.

[0073] 7. 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 be turned on to output a trip trigger signal to the trigger module 420.

[0074] Specifically, after the test switch TEST is pressed, as shown in Figure 9 , on the one hand, the current provided by the first current-carrying line 110 flows through the second resistor R2, the third resistor R3, and the first diode D1 in sequence, and on the other hand, it flows through the fourth resistor R4 and the sixth resistor R6 to the second detection terminal Y, flows through the fifth resistor R5 and the seventh resistor R7 to the second detection terminal Y, and flows to the third terminal c of the first shielding conductor 130, and then after passing through the eighth resistor R8, the second diode D3, and the ninth resistor R9, it flows from the sixth terminal f of the second shielding conductor 140 to the first diode D1; 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 be turned on; in addition, there are other current flow directions as shown by the Figure 9 arrow; After the first triode Q1 is turned on, 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 to charge the first capacitor C1. 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 - sixth diode D6 - 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.

[0075] As shown in Figure 1 , in the detection and protection device provided by some embodiments of the present invention, according to the detection and protection device provided by some embodiments of the present invention, the first triode Q1 is a PNP-type triode.

[0076] In 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 wire 110 so as to collect a leakage signal of the first current-carrying wire 110, and a second shielding conductor 140 wraps around a second current-carrying wire 120 so as to collect a leakage signal of the second current-carrying wire 120. On this basis, a first self-checking unit 210, a second self-checking unit 220, and a third self-checking unit 230 in the self-checking path module cooperate with the first shielding conductor 130 and the second shielding conductor 140 to form an open-circuit self-checking path, and a first detection end X and a second detection end Y are provided. When there is no leakage and 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 and 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 cord and ensuring the power supply safety of the power cord; the detection and protection device for the power cord can effectively and reliably realize the leakage detection of the power cord and the open-circuit detection of the shielding conductor of the power cord.

[0077] Refer to Figure 10 An embodiment of the second aspect of the present invention provides an electrical connection device 800, which includes the detection and protection device according to the first aspect embodiment above, a housing 810, and a power cord. The power cord is connected to the housing 810, and the first self-checking unit 210, the second self-checking unit 220, and the response processing module are arranged in the housing 810.

[0078] In addition, an embodiment of the third aspect of the present invention provides an electrical equipment, which includes a load device and the electrical connection device 800 according to the second aspect embodiment above, and the output end of the power cord is connected to the load device.

[0079] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the technical field, various changes can be made without departing from the gist of the present invention.

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; The detection and protection device comprises: A self-test path module, wherein the first current-carrying line is electrically connected to the first shielding conductor and the second shielding conductor through the self-test path module, and the first shielding conductor is electrically connected to the second shielding conductor 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 first shielding conductor includes a first end close to the input end of the power line, a second end close to the output end of the power line, and a third end located between the first end and the second end; the second shielding conductor includes a fourth end close to the input end, a fifth end close to the output end, and a sixth end located between the fourth end and the fifth end; the third end is electrically connected to the fourth end and the fifth end through the self-test path module.

3. The detection and protection device according to claim 2, 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 between the first current-carrying line and the second current-carrying line, and is provided with a first detection end; the second self-test unit is electrically connected to the first current-carrying line, the first end and the second end, and is provided with a second detection end; the third self-test unit is electrically connected to the third end, the fourth end and the fifth end; The sixth end is electrically connected to the first self-test unit; 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 respectively.

4. The detection and protection device according to claim 3, 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 coupled to one of the first current-carrying line and the second current-carrying line; 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.

5. The detection and protection device according to claim 3, characterized in that: The first self-test unit includes a second resistor, a third resistor and a first diode connected in sequence; the second resistor is coupled to the first current-carrying line, and the cathode of the first diode is connected to the second current-carrying line; the connection point between the second resistor and the third resistor serves as the first detection end.

6. The detection and protection device according to claim 5, characterized in that: The second self-test unit includes a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor; One end of the fourth resistor and one end of the fifth resistor are coupled to the first current-carrying line, The other end of the fourth resistor is connected to one end of the sixth resistor and the first end, The other end of the fifth resistor is connected to one end of the seventh resistor and the second end. The other end of the sixth resistor is connected to the other end of the seventh resistor and serves as the second detection end.

7. The detection and protection device according to claim 6, characterized in that: The third self-test unit includes an eighth resistor and a ninth resistor; The third end is connected to one end of the eighth resistor and one end of the ninth resistor; The other end of the eighth resistor is connected to the fourth end; The other end of the ninth resistor is connected to the fifth end, The sixth end is connected to the anode of the first diode.

8. The detection and protection device according to claim 7, characterized in that: The first self-test unit further includes a second diode, a connection point between the fifth resistor and the seventh resistor is connected to an anode of the second diode, and a cathode of the second diode is connected to the second end; The third self-check unit further includes a third diode, a connection point between the third end and the eighth resistor is connected to an anode of the third diode, and a cathode of the third diode is connected to the fifth end.

9. The detection and protection device according to claim 3, 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 transistor, the emitter of the first transistor is connected to the second detection end, the base of the first transistor is connected to the first detection end, and the collector of the first transistor is 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: The trigger module includes a thyristor, a thyristor driving module and a tripping coil for generating electromagnetic force to drive the switch module to disconnect the power connection; the first current-carrying line is connected to one end of the tripping coil, the other end of the tripping coil is connected to the anode of the thyristor, and the cathode of the thyristor is connected to the anode of the first diode; the thyristor driving module is connected between the collector of the first transistor and the control electrode of the thyristor.

12. The detection and protection device according to claim 11, characterized in that: It also includes a fourth diode, a fifth diode and a tenth resistor; the anode of the fourth diode is connected to the sixth end, and the cathode of the fourth diode is connected to the thyristor driving module; the anode of the fifth diode is connected to the thyristor driving module, the cathode of the fifth diode is connected to one end of the tenth resistor, and the other end of the tenth resistor is coupled to the first current-carrying line.

13. 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, a leakage 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.

14. The detection and protection device according to claim 12, characterized in that: When the second current-carrying line leaks electricity to the second shielding conductor, the tripping trigger signal is output to the thyristor driving module through the fourth diode.

15. The detection and protection device according to claim 10, characterized in that: When an open circuit occurs between the first end and the third end and / or an open circuit occurs between the second end and the third end, 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.

16. The detection and protection device according to claim 10, characterized in that: When an open circuit occurs between the fourth end and the sixth end and / or an open circuit occurs between the fifth end and the sixth end, 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.

17. The detection and protection device according to claim 10, characterized in that: The first transistor is a PNP transistor.

18. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 3 to 17, a shell and the power cord, the power cord is connected to the shell, and the first self-test unit, the second self-test unit and the response processing module are arranged in the shell.

19. An electrical equipment, characterized in that: The invention comprises a load device and the electrical connection device according to claim 18, wherein the output end of the power line is connected to the load device.

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