CN216290169U - Double leakage protection power distribution cabinet - Google Patents
Double leakage protection power distribution cabinet Download PDFInfo
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- CN216290169U CN216290169U CN202122051875.2U CN202122051875U CN216290169U CN 216290169 U CN216290169 U CN 216290169U CN 202122051875 U CN202122051875 U CN 202122051875U CN 216290169 U CN216290169 U CN 216290169U
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Abstract
The utility model discloses a double-leakage protection power distribution cabinet, which comprises a cabinet body, wherein a circuit breaker is arranged in the cabinet body; the main leakage protection module comprises a first zero sequence current transformer, a leakage protection circuit and a trip coil; and the auxiliary leakage protection module comprises a second zero sequence current transformer, an MCU, a state monitoring circuit and a motor. According to the embodiment of the utility model, the main leakage protection module and the auxiliary leakage protection module which are independent of each other are arranged on the circuit breaker, so that the opening of the circuit breaker can be realized through the auxiliary leakage protection module even if the main leakage protection module fails. In addition, the dual leakage protection can be realized by adopting two different leakage protection realization modes, the defect that the conventional power distribution cabinet adopts a single leakage protection technology is overcome, and the possibility of leakage and electric shock accidents is greatly reduced.
Description
Technical Field
The utility model relates to the field of power distribution cabinets, in particular to a double-leakage-protection power distribution cabinet.
Background
The power distribution cabinet is the final-stage equipment of a power distribution system, is used for distributing electric energy in a circuit on superior power distribution equipment to nearby equipment and protecting, monitoring and controlling electric equipment, and is generally provided with a plurality of electric equipment such as transformers, relays, circuit breakers and the like.
The earth leakage protection is the function that the switch board all has, because if the condition of taking place the electric leakage, very easily cause the electric shock accident, there is great potential safety hazard, simultaneously, the electric conduction that the switch board spills is extremely big to the destructiveness of electrical apparatus when going to the inside various electrical apparatus of switch board, very easily arouses the short circuit between electrical apparatus, very unsafe. However, the circuit breaker on the traditional power distribution cabinet only has a single leakage protection function, and when the leakage protection device fails to work, the circuit breaker cannot trip in time in case of leakage and electric shock accidents, and serious consequences can be caused.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a double-leakage-protection power distribution cabinet which can solve the problem that the existing power distribution cabinet is single in leakage protection function.
According to the embodiment of the utility model, the double leakage protection power distribution cabinet comprises: the circuit breaker comprises a cabinet body, wherein a circuit breaker is arranged in the cabinet body; the main leakage protection module comprises a first zero sequence current transformer, a leakage protection circuit and a trip coil, wherein the first zero sequence current transformer is arranged at a wire outlet end of the circuit breaker, a signal output end of the first zero sequence current transformer is connected with an input end of the leakage protection circuit, and an output end of the leakage protection circuit is connected with a wire inlet end switch of the circuit breaker through the trip coil so as to control the opening of the circuit breaker; the auxiliary leakage protection module comprises a second zero sequence current transformer, an MCU, a state monitoring circuit and a motor, wherein the second zero sequence current transformer is arranged at a leading-out end of the circuit breaker and mutually independent with the first zero sequence current transformer, a signal output end of the second zero sequence current transformer is connected with a signal input end of the MCU, the state monitoring circuit is connected with the MCU to monitor and feed back a switching-on and switching-off state of the circuit breaker, the MCU is connected with a control end of the motor through a driving circuit, and the motor is connected with a leading-in end switch of the circuit breaker to control the switching-off of the circuit breaker.
The double leakage protection power distribution cabinet provided by the embodiment of the utility model at least has the following technical effects: according to the embodiment of the utility model, the circuit breaker is provided with the main leakage protection module and the auxiliary leakage protection module which are independent of each other, when the leakage condition occurs at the wire outlet end of the circuit breaker, the first zero sequence current transformer and the second zero sequence current transformer respectively collect leakage current signals to the leakage protection circuit and the MCU, and the leakage protection circuit directly controls the trip coil to open the circuit breaker. MCU passes through the on-off state of state monitoring circuit real-time detection circuit breaker, if leakage current surpasss the limit value and main earth leakage protection module became invalid and when not carrying out the separating brake operation, MCU carries out the circuit breaker separating brake operation through control circuit control motor, even main earth leakage protection module became invalid like this also can realize the separating brake of circuit breaker through assisting the earth leakage protection module. In addition, the main leakage protection module drives the trip coil to realize switching-on and switching-off operations through a hardware circuit, the auxiliary leakage protection module drives the motor to realize leakage protection through the MCU, dual leakage protection can be realized by adopting two different leakage protection realization modes, the defect that the conventional power distribution cabinet adopts a single leakage protection technology is overcome, and the possibility of leakage and electric shock accidents is greatly reduced.
According to some embodiments of the utility model, the leakage protection circuit comprises a leakage protection chip U1, a full bridge rectifier D12 and a triode Q11, the phase line L of the outlet end of the circuit breaker is connected with the anode of one input pin of the full-bridge rectifier D12 through a trip coil L1, phase line N of the circuit breaker outlet end is connected with the cathode of the input pin of the full-bridge rectifier D12, the output pin of the full-bridge rectifier D12 is connected with the power supply pin of the earth leakage protection chip U1, the output end of the first zero sequence current transformer is connected with the signal input end of the leakage protection chip U1 through a sampling circuit, the output pin of the full-bridge rectifier D12 is connected to the collector of the transistor Q11, the emitter of the transistor Q11 and the cathode of the output pin of the full-bridge rectifier D12 are grounded, the signal output end of the leakage protection chip U1 is connected with the base of the triode Q11.
According to some embodiments of the utility model, the leakage protection chip U1 is model LW 54133.
According to some embodiments of the present invention, the sampling circuit includes an interface J1, a resistor R11, a resistor R12, a resistor R13, and a capacitor C11, the interface J1 is connected to a signal output terminal of the first zero-sequence current transformer, two ends of the resistor R11 are respectively connected to a pin 1 and a pin 2 of the interface J1, the pin 1 of the interface J1 is connected to an input pin IN1 of the leakage protection chip U1 through a resistor R12, the pin 2 of the interface J1 is connected to an input pin IN2 of the leakage protection chip U1 through a resistor R13, and the input pin IN2 of the leakage protection chip U1 is connected to an input pin IN1 of the leakage protection chip U1 through a capacitor C11.
According to some embodiments of the utility model, the state monitoring circuit comprises an opening state monitoring circuit and a closing state monitoring circuit, a first micro switch is arranged in the opening state monitoring circuit, the first micro switch is arranged at the opening position of the breaker contact, a second micro switch is arranged in the closing state monitoring circuit, the second micro switch is arranged at the closing position of the breaker contact, and the opening state monitoring circuit and the closing state monitoring circuit are respectively connected with the MCU.
According to some embodiments of the utility model, a signal processing circuit is arranged between the second zero sequence current transformer and the signal input end of the MCU.
According to some embodiments of the utility model, the signal processing circuit includes an interface J2, an operational amplifier U2, and a dc reference voltage source, the interface J2 is connected to the signal output terminal of the second zero sequence current transformer, a positive output pin of the interface J2 is connected to a non-inverting input terminal of the operational amplifier U2 through a resistor R15, a negative output pin of the interface J2 is connected to an inverting input terminal of the operational amplifier U2 through a resistor R16, a resistor R14 is further disposed between the positive output pin and the negative output pin of the interface J2, a common terminal of the interface J2 and the resistor R16 is connected to the dc reference voltage source, and an output terminal of the operational amplifier U2 is connected to the signal input pin of the MCU through a resistor R18.
According to some embodiments of the utility model, the motor is a bi-directional dc motor.
According to some embodiments of the utility model, the power distribution cabinet further comprises a current and voltage sampling module, wherein the current and voltage sampling module is arranged at the inlet wire end of the circuit breaker and is used for acquiring voltage and current data at the inlet wire of the power distribution cabinet.
According to some embodiments of the utility model, the cabinet further comprises a current and voltage meter arranged on the cabinet body, and the current and voltage meter is connected with the current and voltage sampling module.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a dual earth leakage protection power distribution cabinet according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a dual earth leakage protection power distribution cabinet in an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a leakage protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a signal processing circuit according to an embodiment of the present invention.
Reference numerals
The intelligent power supply comprises a cabinet body 100, a circuit breaker 110, a current and voltage sampling module 120, a current voltmeter 130, a knife switch 140, an incoming copper bar 150, a main leakage protection module 200, a first zero-sequence current transformer 210, a leakage protection circuit 220, a trip coil 230, an auxiliary leakage protection module 300, a second zero-sequence current transformer 310, an MCU320, a state monitoring circuit 330, a driving circuit 340, a motor 350 and a signal processing circuit 360.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, a dual earth leakage protection distribution cabinet includes: the cabinet 100, the main earth leakage protection module 200 and the auxiliary earth leakage protection module 300. Referring to fig. 1, a circuit breaker 110 is disposed in a cabinet 100, an incoming line end of the circuit breaker 110 is connected to an incoming line copper bar 150 through a disconnecting link switch 140, and a user can perform a manual switching on and off operation through the disconnecting link switch 140. In this embodiment, two circuit breakers 110 are provided, and are respectively disposed at the left and right sides of the middle region in the cabinet 100, and each circuit breaker 110 is respectively configured with a main leakage protection module 200 and an auxiliary leakage protection module 300 to implement dual leakage protection.
Referring to fig. 2, the main earth leakage protection module 200 includes a first zero sequence current transformer 210, an earth leakage protection circuit 220 and a trip coil 230, the first zero sequence current transformer 210 is installed at an outlet of the circuit breaker 110, a signal output end of the first zero sequence current transformer 210 is connected to an input end of the earth leakage protection circuit 220, an output end of the earth leakage protection circuit 220 is connected to the trip coil 230, and the trip coil 230 controls the opening of the circuit breaker 110.
Referring to fig. 3, taking one phase of a three-phase circuit breaker as an example, the leakage protection circuit 220 includes a leakage protection chip U1, a full-bridge rectifier D12, a sampling circuit and a transistor Q11, a phase line L at an outlet of the circuit breaker 110 is connected to an anode of an input pin of the full-bridge rectifier D12 through a trip coil L1, a phase line N at an outlet of the circuit breaker 110 is connected to a cathode of an input pin of the full-bridge rectifier D12, an anode of an output pin of the full-bridge rectifier D12 is connected to a pin VDD of the leakage protection chip U1 through a resistor R22, a cathode of an output pin of the full-bridge rectifier D12 is grounded, an output end of the first zero-sequence current transformer 210 is connected to signal input pins IN1 and IN2 of the leakage protection chip U1 through the sampling circuit, an anode of an output pin of the full-bridge rectifier D12 is connected to a collector of the transistor Q11, an emitter of the transistor Q11 is grounded, a signal output pin OS of the leakage protection chip U1 is connected to a base of the transistor Q11 through a resistor R21, the leakage protection circuit further comprises a voltage stabilizing diode D11, the negative electrode of the voltage stabilizing diode D11 is connected with the common end of the resistor R22 and the leakage protection chip U1, and the positive electrode of the voltage stabilizing diode D11 is grounded.
The sampling circuit comprises an interface J1, a resistor R11, a resistor R12, a resistor R13 and a capacitor C11, the interface J1 is connected with a signal output end of the first zero-sequence current transformer 210, two ends of the resistor R11 are respectively connected with a pin 1 and a pin 2 of the interface J1, the pin 1 of the interface J1 is connected with an input pin IN1 of the leakage protection chip U1 through a resistor R12, the pin 2 of the interface J1 is connected with an input pin IN2 of the leakage protection chip U1 through a resistor R13, and the input pin IN2 of the leakage protection chip U1 is connected with an input pin IN1 of the leakage protection chip U1 through a capacitor C11. In this embodiment, the model of the leakage protection chip U1 is LW54133, and FM2147 or other conventional leakage protection chips may also be used.
The working principle of the main leakage protection module 200 is as follows:
phase lines L and N of the outlet end of the circuit breaker supply power to a VDD pin of a leakage protection chip U1 through a full-bridge rectifier D12, when the first zero-sequence current transformer 210 detects leakage current, a leakage current signal is converted into a voltage signal through a sampling circuit and then sent to the leakage protection chip U1, when the voltage signal value exceeds a preset value, the leakage protection chip U1 controls a triode Q11 to be conducted, and at the moment, a strong magnetic field is generated on a tripping coil L1 through large current to control the switch-off of the disconnecting switch 140.
Referring to fig. 2, the auxiliary earth leakage protection module 300 includes a second zero sequence current transformer 310, an MCU320, a state monitoring circuit 330 and a motor 350, the second zero sequence current transformer 310 is installed at the outlet of the circuit breaker 110, and the second zero sequence current transformer 310 is spaced apart from the first zero sequence current transformer 210 by a certain distance, so as to be independent and avoid mutual interference. The signal output end of the second zero sequence current transformer 310 is connected with the signal input end of the MCU320, the state monitoring circuit 330 is used for acquiring the switching-on/off state of the circuit breaker 110, the state monitoring circuit 330 is connected with the MCU320 to feed back the switching-on/off state signal, the MCU320 is connected with the control end of the motor 350 through the driving circuit 340, and the switching-on/off of the circuit breaker 110 is controlled through the motor 350. The MCU320 in this embodiment employs a processor chip of the STM32 family.
The state monitoring circuit 330 comprises an opening state monitoring circuit and a closing state monitoring circuit, a first micro switch is arranged in the opening state monitoring circuit, the first micro switch is arranged at the opening position of the contact of the circuit breaker 110, a second micro switch is arranged in the closing state monitoring circuit, the second micro switch is arranged at the closing position of the contact of the circuit breaker 110, the opening state monitoring circuit and the closing state monitoring circuit are respectively connected with the MCU320, when the moving contact of the circuit breaker is positioned at the closing position, the second micro switch is triggered, the MCU320 acquires the state change of the second micro switch through the opening state monitoring circuit, and the circuit breaker is judged to be in the closing state; when the moving contact of the circuit breaker is located at the opening position, the first microswitch is touched, and the MCU320 acquires the state change of the second microswitch through the closing state monitoring circuit to judge that the circuit breaker is in the closing state.
A signal processing circuit 360 is arranged between the second zero-sequence current transformer 220 and the signal input end of the MCU 320. Referring to fig. 4, the signal processing circuit 360 includes an interface J2, an operational amplifier U2, and a dc reference voltage source, the interface J2 is connected to a signal output end of the second zero-sequence current transformer 310, an anode output pin of the interface J2 is connected to a non-inverting input end of the operational amplifier U2 through a resistor R15, a cathode output pin of the interface J2 is connected to an inverting input end of the operational amplifier U2 through a resistor R16, a resistor R14 is further disposed between the anode output pin and the cathode output pin of the interface J2, a common end of the interface J2 and the resistor R16 is connected to the dc reference voltage source VREF, and an output end of the operational amplifier U2 is connected to an a/D conversion pin of the MCU320 through a resistor R18.
The working principle of the signal processing circuit 360 is:
the resistor R4 and the resistor R5 convert the leakage current signal of the second zero-sequence current transformer 220 into a voltage signal, and input the voltage signal to the operational amplifier U2 for amplification, then the operational amplifier U2 inputs the amplified voltage signal to the a/D conversion pin of the MCU320 for a/D conversion, and then sampling is performed, and the introduction of the dc reference voltage source VREF can improve the stability of the level output by the operational amplifier U2.
In this embodiment, the motor 350 is a bidirectional dc motor, which can perform both switching on and switching off operations, and can perform automatic switching on and switching off, and the driving circuit 340 and the bidirectional dc motor are both commercially available.
Referring to fig. 1, in order to visually display the current and power information, the intelligent power distribution cabinet further includes a current and voltage sampling module 120 and a current and voltage meter 130 arranged on the cabinet 100, wherein the current and voltage sampling module 120 is arranged at an incoming line end of the circuit breaker 110 for collecting voltage and current data at an incoming line of the power distribution cabinet. The current-voltage meter 130 is connected to the current-voltage sampling module 120. The current and voltage sampling module 120 adopts a conventional transformer structure, and the current and voltage meter 130 can adopt a separate current meter and a separate voltage meter or an integrated intelligent electric meter.
In summary, in the embodiment of the present invention, the circuit breaker 110 is provided with the main leakage protection module 200 and the auxiliary leakage protection module 300 which are independent of each other, when the leakage occurs at the outlet of the circuit breaker 110, the first zero-sequence current transformer 210 and the second zero-sequence current transformer 310 respectively collect leakage current signals to the leakage protection circuit 220 and the MCU320, and the leakage protection circuit 220 directly controls the trip coil 230 to open the circuit breaker 110. The MCU320 detects the switching-on/off state of the circuit breaker 110 in real time through the state monitoring circuit 330, and if the leakage current exceeds the limit value and the main leakage protection module 200 fails and is not subjected to switching-off operation, the MCU320 controls the motor to perform switching-off operation of the circuit breaker 110 through the control circuit, so that the switching-off of the circuit breaker 110 can be realized through the auxiliary leakage protection module 300 even if the main leakage protection module 200 fails. In addition, the main leakage protection module 200 drives the trip coil 230 to realize switching-on and switching-off operations through a hardware circuit, the auxiliary leakage protection module 300 drives the motor 350 to realize leakage protection through the MCU320, dual leakage protection can be realized by adopting two different leakage protection realization modes, the defect that a conventional power distribution cabinet adopts a single leakage protection technology is overcome, and the possibility of leakage and electric shock accidents is greatly reduced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The utility model provides a dual earth leakage protection switch board which characterized in that includes:
the circuit breaker comprises a cabinet body (100), wherein a circuit breaker (110) is arranged in the cabinet body (100);
the main leakage protection module (200), the main leakage protection module (200) includes a first zero sequence current transformer (210), a leakage protection circuit (220) and a trip coil (230), the first zero sequence current transformer (210) is arranged at an outlet terminal of the circuit breaker (110), a signal output end of the first zero sequence current transformer (210) is connected with an input end of the leakage protection circuit (220), and an output end of the leakage protection circuit (220) is connected with an inlet terminal switch of the circuit breaker (110) through the trip coil (230) to control the opening of the circuit breaker (110);
auxiliary leakage protection module (300), auxiliary leakage protection module (300) includes second zero sequence current transformer (310), MCU (320), state monitoring circuit (330) and motor (350), second zero sequence current transformer (310) sets up the leading-out terminal of circuit breaker (110) and with first zero sequence current transformer (210) are independent of each other, the signal output part of second zero sequence current transformer (310) connects the signal input part of MCU (320), state monitoring circuit (330) with MCU (320) link to each other in order to be used for monitoring and feeding back the divide-shut brake state of circuit breaker (110), MCU (320) are connected through drive circuit (340) the control end of motor (350), motor (350) are connected the inlet wire end switch of circuit breaker (110) is in order to be used for controlling the separating brake of circuit breaker (110).
2. The double earth leakage protection switch board of claim 1, characterized in that: the leakage protection circuit (220) comprises a leakage protection chip U1, a full-bridge rectifier D12 and a triode Q11, the phase line L of the outlet end of the circuit breaker (110) is connected with the anode of one input pin of the full-bridge rectifier D12 through a trip coil (230) L1, the phase line N of the outlet end of the circuit breaker (110) is connected with the cathode of the input pin of the full-bridge rectifier D12, the output pin of the full-bridge rectifier D12 is connected with the power supply pin of the earth leakage protection chip U1, the output end of the first zero sequence current transformer (210) is connected with the signal input end of the leakage protection chip U1 through a sampling circuit, the output pin of the full-bridge rectifier D12 is connected to the collector of the transistor Q11, the emitter of the transistor Q11 and the cathode of the output pin of the full-bridge rectifier D12 are grounded, the signal output end of the leakage protection chip U1 is connected with the base of the triode Q11.
3. The double earth leakage protection switch board of claim 2, characterized in that: the model of the leakage protection chip U1 is LW 54133.
4. The double earth leakage protection switch board of claim 2, characterized in that: the sampling circuit comprises an interface J1, a resistor R11, a resistor R12, a resistor R13 and a capacitor C11, the interface J1 is connected with a signal output end of the first zero-sequence current transformer (210), two ends of the resistor R11 are respectively connected with an anode output pin and a cathode output pin of the interface J1, the anode output pin of the interface J1 is connected with an input pin IN1 of the leakage protection chip U1 through a resistor R12, the cathode output pin of the interface J1 is connected with an input pin IN2 of the leakage protection chip U1 through a resistor R13, and the input pin IN2 of the leakage protection chip U1 is connected with an input pin IN1 of the leakage protection chip U1 through a capacitor C11.
5. The double earth leakage protection switch board of claim 1, characterized in that: the state monitoring circuit (330) is including separating brake state monitoring circuit and combined floodgate state monitoring circuit, be provided with first micro-gap switch in the separating brake state monitoring circuit, first micro-gap switch installs the separating brake position of circuit breaker (110) contact, be provided with second micro-gap switch in the combined floodgate state monitoring circuit, second micro-gap switch installs the closing brake position of circuit breaker (110) contact, separating brake state monitoring circuit and combined floodgate state monitoring circuit connect MCU (320) respectively.
6. The double earth leakage protection switch board of claim 1, characterized in that: and a signal processing circuit (360) is arranged between the second zero sequence current transformer (310) and the signal input end of the MCU (320).
7. The dual earth leakage protection power distribution cabinet according to claim 6, characterized in that: the signal processing circuit (360) comprises an interface J2, an operational amplifier U2 and a direct current reference voltage source, the interface J2 is connected with the signal output end of the second zero sequence current transformer (310), the positive output pin of the interface J2 is connected with the non-inverting input end of the operational amplifier U2 through a resistor R15, the negative output pin of the interface J2 is connected with the inverting input end of the operational amplifier U2 through a resistor R16, a resistor R14 is further arranged between the positive output pin and the negative output pin of the interface J2, the common end of the interface J2 and the common end of the resistor R16 are connected with the direct current reference voltage source, and the output end of the operational amplifier U2 is connected with the signal input pin of the MCU (320) through a resistor R18.
8. The double earth leakage protection switch board of claim 1, characterized in that: the motor (350) adopts a bidirectional direct current motor.
9. The double earth leakage protection switch board of claim 1, characterized in that: the power distribution cabinet is characterized by further comprising a current and voltage sampling module (120), wherein the current and voltage sampling module (120) is arranged at the wire inlet end of the circuit breaker (110) and used for acquiring voltage and current data at the wire inlet position of the power distribution cabinet.
10. The dual earth leakage protection power distribution cabinet according to claim 9, characterized in that: the intelligent cabinet is characterized by further comprising a current voltmeter (130) arranged on the cabinet body (100), wherein the current voltmeter (130) is connected with the current and voltage sampling module (120).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122051875.2U CN216290169U (en) | 2021-08-27 | 2021-08-27 | Double leakage protection power distribution cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122051875.2U CN216290169U (en) | 2021-08-27 | 2021-08-27 | Double leakage protection power distribution cabinet |
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| Publication Number | Publication Date |
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| CN216290169U true CN216290169U (en) | 2022-04-12 |
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| CN202122051875.2U Active CN216290169U (en) | 2021-08-27 | 2021-08-27 | Double leakage protection power distribution cabinet |
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| Country | Link |
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| CN (1) | CN216290169U (en) |
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2021
- 2021-08-27 CN CN202122051875.2U patent/CN216290169U/en active Active
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