Arc fault protection device

Abstract

The embodiment of the utility model provides an arc fault protection device. The arc fault protection device is suitable for being coupled to a first line and a second line of a main loop, and comprises a housing; the detection assembly is arranged in the shell and comprises a Rogowski coil, a signal processing circuit, a control circuit and an electronic release, and the Rogowski coil is suitable for being coupled to the first line to generate a current measurement signal based on the current on the first line; the input end of the signal processing circuit is electrically connected to the output end of the Rogowski coil so as to generate a current characteristic signal based on the current measurement signal, and the control circuit is electrically connected to the output end of the signal processing circuit so as to generate a tripping signal used for indicating whether a direct-current arc fault occurs in a main loop based on the current characteristic signal. The input end of the electronic release is electrically connected to the control circuit so as to operate based on the release signal; and the tripping piece is coupled to the main loop and the electronic tripper, and the tripping piece is suitable for being driven by the electronic tripper so as to be switched between a switching-on position and a switching-off position.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure generally relate to the technical field of electrical equipment, and more particularly, to arc fault protection devices. BACKGROUND

[0002] A DC arc fault refers to a gas breakdown phenomenon caused by poor electrical connection, insulation damage or other reasons in a DC circuit, thereby forming a continuous arc discharge. Such a fault can cause high temperature, fire and even explosion, posing a serious threat to equipment and personnel safety. DC arc faults are particularly common in DC power applications such as photovoltaic systems, electric vehicles, energy storage systems, etc. SUMMARY

[0003] In one aspect of the present disclosure, an arc fault protection device is provided, which is adapted to be coupled to a first line and a second line of a main circuit and comprises: a housing; a detection assembly disposed in the housing and comprising a Rogowski coil, a signal processing circuit, a control circuit and an electronic trip unit, wherein the Rogowski coil is adapted to be coupled to the first line to generate a current measurement signal based on a current on the first line, an input terminal of the signal processing circuit is electrically connected to an output terminal of the Rogowski coil to generate a current characteristic signal based on the current measurement signal, a first input terminal of the control circuit is electrically connected to an output terminal of the signal processing circuit to generate a trip signal based on the current characteristic signal for indicating whether a DC arc fault occurs in the main circuit, and an input terminal of the electronic trip unit is electrically connected to a first output terminal of the control circuit for operation based on the trip signal; and a tripping unit disposed in the housing and coupled to the main circuit and the electronic trip unit, the tripping unit being adapted to be driven by the electronic trip unit to switch between a closed position and an open position.

[0004] The arc fault protection device according to embodiments of the present disclosure is suitable for DC power distribution systems, the Rogowski coil generates a current measurement signal based on a current on the first line, and the signal processing circuit generates a current characteristic signal based on the current measurement signal. Then the control circuit generates a trip signal based on the current characteristic signal for indicating whether a DC arc fault occurs in the main circuit. In the case that a DC arc fault occurs in the main circuit, the electronic trip unit operates based on the trip signal, and the electronic trip unit can drive the tripping unit to switch to the open position for an opening operation, thereby breaking the main circuit and achieving the purpose of cutting off the arc current.

[0005] In some embodiments, a second output terminal of the control circuit is electrically connected to an input terminal of the Rogowski coil to send a self-check signal to the Rogowski coil.

[0006] In some embodiments, the detection assembly further includes a voltage measurement circuit, an input of the voltage measurement circuit is coupled to the first line and the second line to measure a voltage between the first line and the second line, and an output of the voltage measurement circuit is electrically connected to a second input of the control circuit to provide the measured voltage to the control circuit.

[0007] In some embodiments, the detection assembly further includes a Hall coil, the Hall coil is coupled to the first line to generate a direct current measurement signal based on a current on the first line, and an output of the Hall coil is electrically connected to a third input of the control circuit to provide the direct current measurement signal to the control circuit.

[0008] In some embodiments, the detection assembly further includes a power supply circuit, an input of the power supply circuit is coupled to the first line and the second line, and an output of the power supply circuit is electrically connected to the Hall coil, the signal processing circuit, and the control circuit.

[0009] In some embodiments, the housing includes a base and a cover coupled to the base, the detection assembly and the trip member are respectively coupled to the base, and the trip member passes through the cover.

[0010] In some embodiments, the arc fault protection device further includes a positive terminal, a negative terminal, a positive connection line electrically connected to the positive terminal, and a negative connection line electrically connected to the negative terminal, the positive terminal and the negative terminal are respectively coupled to the cover, the positive terminal is coupled to the first line, and the negative terminal is coupled to the second line.

[0011] In some embodiments, the positive connection line passes through the Rogowski coil and the Hall coil.

[0012] In some embodiments, the arc fault protection device further includes a fixing member, the fixing member is disposed on one side of the base, the positive connection line and the negative connection line pass through the base and are disposed on the fixing member spaced apart from each other.

[0013] In some embodiments, the housing further includes a side plate, the side plate is coupled to the cover and includes a fitting hole, the trip member includes a fitting rod, and the fitting rod passes through the fitting hole and is adapted to move within the fitting hole.

[0014] It should be understood that the content described in this section is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent upon reading the following detailed description in conjunction with the accompanying drawings, in which like references refer to like elements. In the drawings:

[0016] Figure 1 A structural schematic diagram of an arc fault protection device is shown according to some embodiments of the present disclosure;

[0017] Figure 2 A structural schematic diagram of an arc fault protection device is shown according to some embodiments of the present disclosure; Figure 1 An exploded view of the arc fault protection device is shown;

[0018] Figure 3 A structural schematic diagram of a detection assembly is shown according to some embodiments of the present disclosure; Figure 4

[0019] A circuit schematic diagram of the detection assembly is shown according to some embodiments of the present disclosure. Figure 5 BRIEF DESCRIPTION OF DRAWINGS

[0020] 100 is an arc fault protection device; 200 is a main circuit, 201 is a first line, 202 is a second line;

[0021] 1 is a housing, 11 is a base, 12 is a cover plate, 121 is an opening, 122 is a through hole, 13 is a side plate, 131 is a matching hole, 132 is a mounting portion;

[0022] 2 is a detection assembly, 21 is a Rogowski coil, 22 is a signal processing circuit, 23 is a control circuit, 24 is an electronic trip unit, 25 is a Hall coil, 26 is a power supply circuit, 27 is a voltage measurement circuit, 28 is an indicator light, 29 is a substrate;

[0023] 3 is a tripping part, 31 is a matching rod;

[0024] 41 is a positive terminal, 42 is a negative terminal, 43 is a positive connection wire, 44 is a negative connection wire;

[0025] 51 is a terminal lug, 52 is a terminal frame, 53 is a terminal screw;

[0026] 6 is a fixing part, 61 is a limiting groove.

[0027] DETAILED DESCRIPTION

[0028] ​Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0029] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0030] DC arc fault detection is primarily used in photovoltaic (PV) systems. Conventional arc fault protection modules can be integrated into the DC side of the inverter or in the combiner box, or by adding distributed components to each PV panel to protect the PV panels and connecting cables. For inverters, if an arc fault protection module is not embedded at the factory, a separate arc fault protector is required if the customer wants to add arc protection later. However, for other DC systems, such as buildings and data centers using DC power, there is a lack of DC arc fault protectors similar to AC arc fault protectors to achieve arc fault protection. Embodiments of this disclosure provide an arc fault protection device suitable for DC power distribution systems to at least partially solve the above problems. In the following sections, [the following will be combined with...] Figures 1 to 5 The principles of this disclosure are described.

[0031] Figure 1 A schematic diagram of the structure of an arc fault protection device 100 according to some embodiments of the present disclosure is shown. Figure 2 It shows Figure 1 The exploded view of the arc fault protection device 100 is shown. Figure 1 and Figure 2 As shown, the arc fault protection device 100 described herein is adapted to be coupled to the main circuit 200. Figure 5 The first circuit 201 and the second circuit 202 (shown in the diagram) generally include a housing 1, a detection component 2, a tripping component 3, a positive terminal connector 41, a negative terminal connector 42, a positive connecting wire 43, a negative connecting wire 44, and a fixing component 6. The housing 1 mainly serves as a mounting carrier, and the detection component 2, the tripping component 3, the positive terminal connector 41, the negative terminal connector 42, the positive connecting wire 43, the negative connecting wire 44, and the fixing component 6 can be coupled to the housing 1.

[0032] Figure 3and Figure 4 A schematic diagram of the structure of the detection component 2 according to some embodiments of the present disclosure is shown. Figure 5 A circuit schematic of the detection component 2 according to some embodiments of the present disclosure is shown. For example... Figures 2 to 5 As shown, in some embodiments, the detection component 2 is mainly used to detect whether a DC arc fault occurs in the main circuit 200, and to drive the trip unit 3 when a DC arc fault is detected to disconnect the main circuit 200, thereby achieving the purpose of cutting off the arc current. The detection component 2 can be disposed in the housing 1 and includes a substrate 29, a Rogowski coil 21, a signal processing circuit 22, a control circuit 23, an electronic trip unit 24, a Hall coil 25, a power supply circuit 26, a voltage measurement circuit 27, and an indicator light 28. The substrate 29 may, for example, include a printed circuit board, wherein the Rogowski coil 21, the signal processing circuit 22, the control circuit 23, the electronic trip unit 24, the Hall coil 25, the power supply circuit 26, the voltage measurement circuit 27, and the indicator light 28 are respectively disposed on the substrate 29. The control circuit 23 is mainly used to implement control functions, and may, for example, include a microcontroller unit (MCU).

[0033] For example, refer to Figures 2 to 4 In some embodiments, the Rogowski coil 21, the electronic trip unit 24, and the Hall coil 25 may be disposed on one side of the substrate 29. The signal processing circuit 22, the control circuit 23, the voltage measurement circuit 27, and the indicator light 28 may be disposed on the other side of the substrate 29. The power supply circuit 26 may be disposed on both sides of the substrate 29. It should be understood that in other embodiments, the above-mentioned components may also be disposed on the substrate 29 using any other suitable connection method, and the embodiments of this disclosure are not limited thereto.

[0034] refer to Figure 5 In some embodiments, the Rogowski coil 21 is adapted to be coupled to the first line 201 to generate a current measurement signal based on the current on the first line 201. The first line 201 may, for example, include the positive line in the main circuit 200, so that the Rogowski coil 21 generates the current measurement signal based on the current on the positive line, and the current measurement signal may, for example, include an alternating current measurement signal. Correspondingly, the second line 202 may, for example, include the negative line in the main circuit 200. An input to the signal processing circuit 22 is electrically connected to the output of the Rogowski coil 21 to generate a current characteristic signal based on the current measurement signal. A first input to the control circuit 23 is electrically connected to the output of the signal processing circuit 22 to generate a trip signal based on the current characteristic signal to indicate whether a DC arc fault has occurred in the main circuit 200. An input to the electronic trip unit 24 is electrically connected to the first output of the control circuit 23 to operate based on the trip signal.

[0035] It should be noted that the signal processing circuit 22 according to the embodiments of the present disclosure can be various types of signal processing circuits 22 currently known or available in the future, and the embodiments of the present disclosure do not limit this. For example, in some embodiments, the signal processing circuit 22 can include a band-pass filter and a high-frequency signal processing circuit.

[0036] In combination Figure 2 , Figure 3 and Figure 5 , further, the tripping member 3 can be disposed in the housing 1 and coupled to the main circuit 200 and the electronic tripper 24. The tripping member 3 is adapted to be driven by the electronic tripper 24 to switch between the closed position and the open position.

[0037] The arc fault protection device according to the embodiments of the present disclosure can be applied to a direct current power distribution system, the Rogowski coil 21 generates a current measurement signal based on the current on the first line 201, and the signal processing circuit 22 generates a current feature signal based on the current measurement signal. Then the control circuit 23 generates a tripping signal based on the current feature signal for indicating whether a direct current arc fault occurs in the main circuit 200. In the case that a direct current arc fault occurs in the main circuit 200, the electronic tripper 24 operates based on the tripping signal, and the electronic tripper 24 can drive the tripping member 3 to switch to the open position for an open operation, thereby breaking the main circuit 200 and achieving the purpose of cutting off the arc current.

[0038] In addition, the arc fault protection device according to the embodiments of the present disclosure does not need to be integrated in the direct current side of the inverter or the bus box, and compared with the conventional arc fault protection module, can be applied to a direct current power distribution system, for example, a building, a data center, etc. that adopts direct current power supply, and does not need to embed the arc fault protection module in the inverter at the factory.

[0039] It should be noted that in the case that a direct current arc fault occurs in the main circuit 200, the signal value of the current feature signal will jump. The control circuit 23 can detect the change amount and the change time of the current feature signal, if the change time lasts for a short time, the signal value jump can be caused by load switching or switch gear position switching, etc. However, if the change time lasts for a long time, it indicates that a direct current arc fault occurs in the main circuit 200.

[0040] The tripping member 3 according to the embodiments of the present disclosure can cooperate with the electronic tripper 24 in any manner to be driven by the electronic tripper 24, and the embodiments of the present disclosure do not limit this. For example, referring to Figure 2 and Figure 3In some embodiments, after the electronic trip unit 24 receives the trip signal, the coil of the electronic trip unit 24 is energized and generates a magnetic field to drive the moving iron core of the electronic trip unit 24. The moving iron core is capable of hitting the trip bar of the trip unit 3, which is originally interlocked with the locking unit, and after being hit, the trip bar can be separated from the locking unit, and under the action of the torsional spring, the trip unit 3 starts to trip, thereby driving the electrical switch (not shown in the figure) such as a circuit breaker to trip through the cooperation of the lever 31. The electrical switch may, for example, include a 400V DC circuit breaker, and embodiments of the present disclosure are not limited thereto.

[0041] The trip unit 3 according to embodiments of the present disclosure can interrupt the main circuit 200 in any manner to cut off the arc current, and embodiments of the present disclosure are not limited thereto. For example, referring to Figure 2 and Figure 5 In some embodiments, the lever 31 can be coupled to the interrupting unit of the electrical switch such as a circuit breaker. Since the interrupting unit of the electrical switch can be coupled to the main circuit 200, the trip unit 3 can be coupled to the main circuit 200. In this way, in the case that the trip unit 3 is driven by the electronic trip unit 24, the lever 31 can be switched from the closed position to the open position, and the lever 31 can drive the interrupting unit of the electrical switch to trip, thereby disconnecting the electrical switch from the main circuit 200, thereby cutting off the arc current.

[0042] Continuing to refer to Figures 3 to 5 In some embodiments, the input end of the voltage measurement circuit 27 can be coupled to the first line 201 and the second line 202 to measure the voltage between the first line 201 and the second line 202 and generate a DC voltage measurement signal. The output end of the voltage measurement circuit 27 can be electrically connected to the second input end of the control circuit 23 to provide the measured voltage to the control circuit 23.

[0043] In this way, the control circuit 23 can assist in judging and generating a trip signal based on the DC voltage measurement signal to improve the accuracy of generating the trip signal. In the case of a DC arc fault in the main circuit 200, the electronic trip unit 24 can operate based on the trip signal, and the electronic trip unit 24 can drive the trip unit 3 to switch to the open position for the opening operation, thereby interrupting the main circuit 200 and achieving the purpose of cutting off the arc current.

[0044] Continuing to refer to Figures 3 to 5 In some embodiments, the Hall coil 25 can be coupled to the first line 201 to generate a DC current measurement signal based on the current on the first line 201. The output end of the Hall coil 25 is electrically connected to the third input end of the control circuit 23 to provide the DC current measurement signal to the control circuit 23.

[0045] In this way, the control circuit 23 can assist in determining and generating the trip signal based on the direct current measurement signal, so as to improve the accuracy of generating the trip signal. In the case of a direct arc fault in the main circuit 200, the electronic trip unit 24 can operate based on the trip signal, and the electronic trip unit 24 can drive the trip member 3 to switch to the open position to perform an opening operation, so as to break the main circuit 200 and achieve the purpose of cutting off the arc current.

[0046] With continued reference to Figures 3 to 5 In some embodiments, the input end of the power supply circuit 26 can be coupled to the first line 201 and the second line 202. The output end of the power supply circuit 26 can be electrically connected to the Hall coil 25, the signal processing circuit 22, and the control circuit 23. In this way, the power supply circuit 26 can convert the voltage between the first line 201 and the second line 202 to a working voltage for the operation of the backend circuit. For example, the power supply circuit 26 can provide a working voltage of 3.3V to the Hall coil 25. The Rogowski coil 21 does not need to be powered, and the electronic trip unit 24 can take power from the first line 201 and the second line 202 of the main circuit 200. In addition, the power supply circuit 26 also integrates a port protection circuit to prevent voltage surges or anti-surge, so as to avoid damaging the electronic elements of the arc fault protection device 100.

[0047] With continued reference to Figures 3 to 5 In some embodiments, the fifth input end of the control circuit 23 can receive a test signal to detect whether a user presses a test button. The second output end of the control circuit 23 can be electrically connected to the input end of the Rogowski coil 21. If the user presses the test button, the control circuit 23 can send a self-test signal to the Rogowski coil 21 to detect whether the Rogowski coil 21, the band-pass filter, and the high-frequency signal processing circuit are working normally. Specifically, the Rogowski coil 21 can include a detection coil and a test coil, and the self-test signal can be a pulse width modulation (PWM) wave of MHz order, for example, 10MHz. After the test coil receives the self-test signal, the detection coil will synchronously detect an alternating current component of 10MHz, and send a high-frequency current measurement signal to the band-pass filter and the high-frequency signal processing circuit. The band-pass filter and the high-frequency signal processing circuit can convert the high-frequency current measurement signal into a high-frequency current characteristic signal and output to the control circuit 23. After the control circuit 23 receives the high-frequency current characteristic signal and detects the amplitude thereof, it can determine whether the Rogowski coil 21, the band-pass filter, and the high-frequency signal processing circuit are working normally.

[0048] With continued reference to Figure 1 , Figure 4 and Figure 5In some embodiments, the indicator light 28 can be electrically connected to the third output terminal of the control circuit 23. When the arc fault protection device 100 is working normally, the control circuit 23 can control the indicator light 28 to display green color. However, when the arc fault protection device 100 detects an arc fault, the control circuit 23 can control the indicator light 28 to display red color, thereby warning the operator. In addition, the fourth input terminal of the control circuit 23 can also receive a closing signal to determine whether the arc fault protection device 100 is closed.

[0049] Referring back to Figure 1 and Figure 2 In some embodiments, the housing 1 can include a base 11, a cover plate 12, and a side plate 13. The cover plate 12 can be coupled to the base 11. The detection assembly 2 and the tripping member 3 are respectively coupled to the base 11 to be assembled on the base 11. In addition, the tripping member 3 can also pass through the cover plate 12, so that the tripping member 3 can be firmly assembled on the housing 1. Referring to Figure 2 The side plate 13 can be coupled to the cover plate 12 at the opening 121, for example, by snap connection. The tripping member 3 can be arranged on one side of the side plate 13.

[0050] Continuing to refer to Figure 2 and Figure 5 Further, the side plate 13 can include a matching hole 131 and at least one mounting portion 132. The at least one mounting portion 132 can be coupled to an electrical switch such as a circuit breaker to connect the arc fault protection device 100 with the electrical switch. In addition, the matching rod 31 of the tripping member 3 can pass through the matching hole 131 and be coupled to a breaking unit of the electrical switch such as a circuit breaker. The matching rod 31 is adapted to move within the matching hole 131 and drive the breaking unit of the electrical switch to act, thereby disconnecting the electrical switch from the main circuit 200, and thus achieving the purpose of cutting off the arc current.

[0051] Continuing to refer to Figure 2 and Figure 5In some embodiments, the positive terminal 41 and the negative terminal 42 can be coupled to the cover plate 12, respectively. Specifically, each of the positive terminal 41 and the negative terminal 42 can include a terminal tab 51, a terminal frame 52, and a terminal screw 53, and the terminal tab 51 can be disposed within the corresponding terminal frame 52. The cover plate 12 is provided with a pair of through holes 122. The terminal tab 51 and the terminal frame 52 can be disposed inside the housing 1. The first wire 201 can pass through the base 11 and be disposed within the terminal frame 52 of the positive terminal 41, and finally the terminal screw 53 of the positive terminal 41 is screwed into the corresponding through hole 122 and the corresponding terminal frame 52 to conduct the first wire 201 and the corresponding terminal tab 51, so that the positive terminal 41 can be coupled to the first wire 201. In addition, the second wire 202 can pass through the base 11 and be disposed within the terminal frame 52 of the negative terminal 42, and finally the terminal screw 53 of the negative terminal 42 is screwed into the corresponding through hole 122 and the corresponding terminal frame 52 to conduct the second wire 202 and the corresponding terminal tab 51, so that the negative terminal 42 can be coupled to the second wire 202.

[0052] With continued reference to Figure 2 and Figure 5 Further, the positive connection wire 43 can be electrically connected with the terminal tab 51 of the positive terminal 41 to couple the positive connection wire 43 to the first wire 201. In addition, the negative connection wire 44 can be electrically connected with the terminal tab 51 of the negative terminal 42 to couple the negative connection wire 44 to the second wire 202.

[0053] The Rogowski coil 21 and the Hall coil 25 according to embodiments of the present disclosure can be coupled to the first wire 201 in any manner to generate the current measurement signal and the direct current measurement signal. For example, with continued reference to Figure 2 and Figure 5 In some embodiments, the positive connection wire 43 can pass through the Rogowski coil 21 and the Hall coil 25 to couple the Rogowski coil 21 and the Hall coil 25 to the first wire 201. The Rogowski coil 21 and the Hall coil 25 can be non-contact connected with the positive connection wire 43. It should be understood that in other embodiments, the Rogowski coil 21 and the Hall coil 25 can also be coupled to the first wire 201 in any other suitable manner.

[0054] It should be noted that the shapes of the positive connection wire 43 and the negative connection wire 44 can be changed. It can be understood that since the positive connection wire 43 is electrically connected with the positive terminal 41 and the negative connection wire 44 is electrically connected with the negative terminal 42, the positions of the positive terminal 41 and the negative terminal 42 can be interchanged in the case of changing the shapes of the positive connection wire 43 and the negative connection wire 44. In this case, the positive connection wire 43 can still pass through the Rogowski coil 21 and the Hall coil 25.

[0055] Referring back to Figure 1 and Figure 2 In some embodiments, the fixing member 6 can be disposed on one side of the base 11. The positive connection line 43 and the negative connection line 44 can pass through the base 11 and be disposed on the fixing member 6. An electrical switch such as a circuit breaker can be coupled to the fixing member 6 and connected with the positive connection line 43 and the negative connection line 44.

[0056] Continuing to refer to Figure 2 Further, the fixing member 6 can include a pair of limiting grooves 61. The positive connection line 43 and the negative connection line 44 can be disposed within the respective limiting grooves 61. The pair of limiting grooves 61 can be spaced apart from each other to space apart the positive connection line 43 and the negative connection line 44 on the fixing member 6. It can be appreciated that the positive connection line 43 and the negative connection line 44 can be reliably connected with the electrical switch due to the spaced apart arrangement of the positive connection line 43 and the negative connection line 44.

[0057] The arc fault protection design according to embodiments of the present disclosure can be applied to various direct current power distribution systems, such as electrical switches of circuit breakers, to at least partially address the above-mentioned problems. It should be appreciated that the arc fault protection design according to embodiments of the present disclosure can also be applied to other power distribution systems, for which embodiments of the present disclosure are not limited.

[0058] The above has described various embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical application, or technical improvement in the market, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. An arc fault protection device (100) adapted to be coupled to a first line (201) and a second line (202) of a main circuit (200), characterized in that, The arc fault protection device (100) comprises: a housing (1); a detection assembly (2) disposed in the housing (1) and comprising a Rogowski coil (21), a signal processing circuit (22), a control circuit (23), and an electronic tripper (24), wherein the Rogowski coil (21) is adapted to be coupled to the first line (201) to generate a current measurement signal based on the current on the first line (201), an input of the signal processing circuit (22) is electrically connected to an output of the Rogowski coil (21) to generate a current feature signal based on the current measurement signal, a first input of the control circuit (23) is electrically connected to an output of the signal processing circuit (22) to generate a tripping signal based on the current feature signal for indicating whether a DC arc fault occurs in the main circuit (200), and an input of the electronic tripper (24) is electrically connected to a first output of the control circuit (23) to be operated based on the tripping signal; and a tripping piece (3) disposed in the housing (1) and coupled to the main circuit (200) and the electronic tripper (24), the tripping piece (3) being adapted to be driven by the electronic tripper (24) to switch between a closed position and an open position.

2. The arc fault protection device (100) of claim 1, wherein, A second output of the control circuit (23) is electrically connected to an input of the Rogowski coil (21) to send a self-check signal to the Rogowski coil (21).

3. The arc fault protection device (100) of claim 1, wherein, The detection assembly (2) further comprises a voltage measurement circuit (27), an input of the voltage measurement circuit (27) is coupled to the first line (201) and the second line (202) to measure a voltage between the first line (201) and the second line (202), and an output of the voltage measurement circuit (27) is electrically connected to a second input of the control circuit (23) to provide the measured voltage to the control circuit (23).

4. The arc fault protection device (100) of claim 1, wherein, The detection assembly (2) further comprises a Hall coil (25), the Hall coil (25) is coupled to the first line (201) to generate a DC current measurement signal based on the current on the first line (201), and an output of the Hall coil (25) is electrically connected to a third input of the control circuit (23) to provide the DC current measurement signal to the control circuit (23).

5. The arc fault protection device (100) of claim 4, wherein, The detection assembly (2) further comprises a power supply circuit (26), an input of the power supply circuit (26) is coupled to the first line (201) and the second line (202), and an output of the power supply circuit (26) is electrically connected to the Hall coil (25), the signal processing circuit (22), and the control circuit (23).

6. The arc fault protection device (100) of claim 4, wherein, The housing (1) comprises a base (11) and a cover plate (12) coupled to the base (11), the detection assembly (2) and the tripping piece (3) are respectively coupled to the base (11), and the tripping piece (3) passes through the cover plate (12).

7. The arc fault protection device (100) of claim 6, characterized by The arc fault protection device (100) further comprises a positive terminal (41), a negative terminal (42), a positive connecting wire (43) electrically connected with the positive terminal (41), and a negative connecting wire (44) electrically connected with the negative terminal (42), the positive terminal (41) and the negative terminal (42) are coupled to the cover plate (12) respectively, the positive terminal (41) is coupled to the first line (201), and the negative terminal (42) is coupled to the second line (202).

8. The arc fault protection device (100) of claim 7, characterized in that, The positive connecting wire (43) passes through the Rogowski coil (21) and the Hall coil (25).

9. The arc fault protection device (100) of claim 8, characterized by The arc fault protection device (100) further comprises a fixing piece (6) provided on one side of the base (11), the positive connecting wire (43) and the negative connecting wire (44) pass through the base (11) and are provided on the fixing piece (6) at intervals.

10. The arc fault protection device (100) of claim 6, wherein, The shell (1) further comprises a side plate (13) coupled to the cover plate (12) and comprising a matching hole (131), the tripping piece (3) comprises a matching rod (31), and the matching rod (31) passes through the matching hole (131) and is adapted to move in the matching hole (131).

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