Distribution box and control method thereof

Abstract

The invention provides a distribution box and a control method thereof. A distribution box comprises a box body, a grounding wire, a grounding resistance measuring device and a locking device, the locking device is installed on the box body, one end of the grounding wire is connected with the box body, the other end of the grounding wire is grounded, the grounding resistance measuring device is connected with the grounding wire, and the locking device is installed on the box body. And the locking device is connected with the grounding resistance measuring equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly relates to a distribution box and a control method thereof. Background Art

[0002] Mobile distribution boxes are widely used in occasions such as temporary power supply and construction sites, and their safety is of crucial importance. Poor grounding may lead to accidents such as electric shock and equipment damage. In actual construction, there are situations where mobile distribution boxes are used without being grounded, posing a relatively high safety risk. The following problems exist:

[0003] 1. Lack of automatic locking function: The existing box door of the distribution box is only manually locked by a mechanical lock, and it cannot prevent the box door from being opened to use the distribution box when the grounding is poor.

[0004] 2. High safety hazards: When the grounding is poor, the operator may perform incorrect operations, resulting in electric shock or equipment damage. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a distribution box and a control method thereof in view of the deficiencies of the prior art.

[0006] The technical solution of the present invention to solve the above technical problem is as follows: A distribution box includes: a box body, a grounding wire, a grounding resistance measuring device, and a locking device. The locking device is installed on the box body. One end of the grounding wire is connected to the box body, the other end of the grounding wire is grounded, the grounding resistance measuring device is connected to the grounding wire, and the locking device is connected to the grounding resistance measuring device.

[0007] The beneficial effect of adopting the technical solution of the present invention is that the locking device is used to lock or unlock the box door. When the grounding resistance does not meet the requirements, the box door is locked and cannot be opened. The box door is controlled by measuring the grounding to ensure that the distribution box must be well grounded before use, so as to improve the safety of the mobile distribution box.

[0008] Further, a box door is rotatably installed on one side of the box body. The locking device is installed on the box body, or the locking device is installed on the box body through the box door; a mechanical lock is installed on the box door or the box body.

[0009] The beneficial effect of adopting the above further technical solution is that the locking device is installed on the box body or the box door, which is convenient to select the installation position of the locking device according to actual needs, and is convenient for the installation and maintenance of the locking device. The setting of the mechanical lock is used to keep the locking device in the unlocked state when the grounding resistance meets the requirements during the use of the distribution box, and the box door is locked by the mechanical lock to prevent the box door from being opened randomly, realizing locking during operation.

[0010] Further, the latching device is connected to the grounding resistance measuring device through a control device.

[0011] The beneficial effects of adopting the above further technical solution are as follows: The grounding resistance measuring device is used to measure the grounding resistance value of the distribution box in real time and transmit the measurement result to the control device. The control device is used to receive the data of the grounding resistance measuring device and determine whether the grounding resistance exceeds the set threshold. If it exceeds the threshold, a latching signal is sent to the latching device; if it does not exceed the threshold, an unlocking signal is sent.

[0012] Further, the control device is connected to a power supply device, and the power supply device is installed in the box body.

[0013] The beneficial effects of adopting the above further technical solution are as follows: The power supply device provides a stable power supply for the entire system. When the mobile distribution box moves to the construction site, through the built-in power supply device, the box door can be opened during the installation of the distribution box, and the grounding resistance measuring device and the latching device can be powered in real time.

[0014] Further, the power supply device includes: a lithium battery and an external power adapter. A voltage stabilizing circuit and an overload protection circuit are provided in the power supply device; both the lithium battery and the external power adapter are connected to the control device.

[0015] The beneficial effects of adopting the above further technical solution are as follows: The power supply device includes a lithium battery and an external power adapter, which can adapt to different usage environments. The power supply device includes a voltage stabilizing circuit and an overload protection circuit to ensure the stable operation of the system. When the mobile distribution box moves to the construction site, through the built-in lithium battery, the box door can be opened during the installation of the distribution box, and the grounding resistance measuring device and the latching device can be powered in real time. The external power adapter is used to charge the lithium battery and supply power to the grounding resistance measuring device and the latching device.

[0016] Further, the grounding resistance measuring device is a four-wire method grounding resistance measuring device.

[0017] The beneficial effects of adopting the above further technical solution are as follows: By using the four-wire method for measurement, the influence of wire resistance and contact resistance is eliminated, ensuring the measurement accuracy.

[0018] Further, the latching device is an electromagnetic lock or a motor-driven lock. A motor is installed in the motor-driven lock, and the output shaft of the motor is connected to a rotating rod for mechanical unlocking. The free end of the rotating rod is exposed outside the box body or the box door; the latching device is connected to a first switch for power-off unlocking of the electromagnetic lock or the latching device is connected to a second switch for switching the rotation direction of the motor in the motor-driven lock to achieve unlocking.

[0019] The beneficial effects of adopting the above further technical solution are as follows: The locking device can adopt an electromagnetic lock or a motor-driven lock, with a simple structure and high reliability. The first switch and the second switch are provided to unlock the locking device according to actual needs, preventing professional personnel from being unable to open the distribution box and perform installation and maintenance on the distribution box when the locking device is locked. The first switch is used to cut off the power supply of the electromagnetic lock, so that the locking device is unlocked, and the second switch is used to control the reverse rotation of the motor so that the motor-driven lock is automatically unlocked. The setting of the rotating rod is used to manually rotate the rotating rod to drive the motor to rotate according to actual needs when the motor-driven lock is powered off, so as to achieve unlocking and locking.

[0020] In addition, the present invention also provides a distribution box control method. Based on any one of the above distribution boxes, the distribution box control method includes: measuring the grounding resistance value of the distribution box in real time; determining whether the grounding resistance value exceeds a set threshold; when the grounding resistance value exceeds the set threshold, locking the box door of the distribution box.

[0021] The beneficial effects of adopting the technical solution of the present invention are as follows: The locking device is used to lock or unlock the box door. When the grounding resistance does not meet the requirements, the box door is locked and cannot be opened. The box door is controlled by measuring the grounding, ensuring that the distribution box must be well grounded before use. To improve the safety of the mobile distribution box.

[0022] Further, after the step of determining whether the grounding resistance value exceeds the set threshold, it includes: when the grounding resistance value does not exceed the set threshold, unlocking the box door of the distribution box.

[0023] The beneficial effects of adopting the above further technical solution are as follows: When the grounding resistance value meets the requirements, the box door is unlocked and can be opened, and the distribution box can be used.

[0024] Further, the set threshold is 10Ω or 4Ω.

[0025] The beneficial effects of adopting the above further technical solution are as follows: It is applicable to various high and low voltage systems, expanding the scope of application.

[0026] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is one of the structural schematic diagrams of the distribution box provided by the embodiment of the present invention.

[0028] Figure 2 It is the second of the structural schematic diagrams of the distribution box provided by the embodiment of the present invention.

[0029] Figure 3 It is one of the principle schematic diagrams of the distribution box provided by the embodiment of the present invention.

[0030] Figure 4 This is the second schematic diagram of the principle of the distribution box provided by the embodiment of the present invention.

[0031] Figure 5 This is a schematic flowchart of the control method for the distribution box provided by the embodiment of the present invention.

[0032] Explanation of the reference numerals in the drawings: 1. Box body; 2. Ground wire; 3. Ground resistance measuring device; 4. Locking device; 5. Box door; 6. Control device; 7. Power supply device; 8. Mechanical lock; 9. Motor; 10. Rotating rod; 11. First switch; 12. Second switch. Detailed implementation manners

[0033] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The illustrated embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0034] As Figures 1 to 4 shown, the embodiment of the present invention provides a distribution box, including: a box body 1, a ground wire 2, a ground resistance measuring device 3, and a locking device 4. The locking device 4 is installed on the box body 1. One end of the ground wire 2 is connected to the box body 1, and the other end of the ground wire 2 is grounded. The ground resistance measuring device 3 is connected to the ground wire 2, and the locking device 4 is connected to the ground resistance measuring device 3.

[0035] The beneficial effects of adopting the technical solution of the present invention are as follows: The locking device is used to lock or unlock the box door. When the ground resistance does not meet the requirements, the box door is locked and cannot be opened. The box door is controlled by measuring the ground connection to ensure that the distribution box must be well grounded before use. To improve the safety of the mobile distribution box.

[0036] Among them, the distribution box may be, but is not limited to, a mobile distribution box.

[0037] The present invention relates to the technical field of power equipment, and particularly relates to a mobile distribution box (distribution box), especially a mobile distribution box that realizes box door locking through the ground resistance value, which is applicable to occasions such as temporary power supply and construction sites.

[0038] The box door is controlled by measuring the ground connection to ensure that the distribution box must be well grounded before use. When the ground resistance value meets the requirements, the box door locking is unlocked and the box door can be opened, and the distribution box can be used; when the ground resistance does not meet the requirements, the box door is automatically locked and cannot be opened. It fundamentally solves the occurrence of the situation where the distribution box is used without grounding, and improves the safety of electricity use.

[0039] 1. Installation of the ground resistance measuring device: Connect the measuring electrode to the ground wire of the distribution box to ensure good contact between the electrode and the ground wire.

[0040] The measuring device (grounding resistance measuring device) collects the grounding resistance value in real time and transmits the data to the control device.

[0041] 2. Working process of the control device: The control device receives the measurement data and judges whether the grounding resistance exceeds the set threshold (such as 10 Ω).

[0042] If it exceeds the threshold, the control device sends a locking signal to the locking device; if it does not exceed the threshold, it sends an unlocking signal.

[0043] 3. Working process of the locking device: After receiving the signal from the control device, the locking device drives the electromagnetic lock or the motor lock (motor-driven lock) to lock or unlock the cabinet door.

[0044] When the grounding resistance exceeds the standard, the cabinet door is automatically locked and cannot be opened; when the grounding resistance is normal, the cabinet door is unlocked and can be used normally.

[0045] 4. Working process of the power supply device: The power supply device provides stable power for the grounding resistance measuring device, the control device and the locking device.

[0046] Lithium batteries or external power adapters can be used to ensure the normal operation of the system in different environments.

[0047] As Figures 1 to 4 shown, further, one side of the box body 1 is rotatably installed with a cabinet door 5, the locking device 4 is installed on the box body 1, or the locking device 4 is installed on the box body 1 through the cabinet door 5; a mechanical lock 8 is installed on the cabinet door 5 or the box body 1.

[0048] The beneficial effect of adopting the above further technical solution is that the locking device is installed on the box body or the cabinet door, which is convenient to select the installation position of the locking device according to actual needs, and is convenient for the installation and maintenance of the locking device. The setting of the mechanical lock is used to keep the locking device in the unlocked state when the grounding resistance meets the requirements during the use of the distribution box. The cabinet door is locked by the mechanical lock to prevent the cabinet door from being opened randomly and realize locking during operation.

[0049] As Figures 1 to 4 shown, further, the locking device 4 is connected to the grounding resistance measuring device 3 through the control device 6.

[0050] The beneficial effect of adopting the above further technical solution is that the grounding resistance measuring device is used to measure the grounding resistance value of the distribution box in real time and transmit the measurement result to the control device. The control device is used to receive the data of the grounding resistance measuring device and judge whether the grounding resistance exceeds the set threshold. If it exceeds the threshold, a locking signal is sent to the locking device; if it does not exceed the threshold, an unlocking signal is sent.

[0051] Among them, the control device 6 can be installed in the box body 1.

[0052] As Figures 1 to 4 shown, further, the control device 6 is connected to a power supply device 7, and the power supply device 7 is installed in the box body 1.

[0053] The beneficial effect of adopting the above further technical solution is that the power supply device provides a stable power supply for the entire system. When the mobile distribution box is moved to the construction site, through the built-in power supply device, the box door can be opened during the installation of the distribution box, and the grounding resistance measuring device and the locking device can be powered in real time.

[0054] Among them, the power supply device can be installed in the box body.

[0055] Further, the power supply device 7 includes: a lithium battery and an external power adapter, and a voltage stabilizing circuit and an overload protection circuit are provided in the power supply device; both the lithium battery and the external power adapter are connected to the control device 6.

[0056] The beneficial effect of adopting the above further technical solution is that the power supply device includes a lithium battery and an external power adapter, which can adapt to different usage environments. The power supply device includes a voltage stabilizing circuit and an overload protection circuit to ensure the stable operation of the system. When the mobile distribution box is moved to the construction site, through the built-in lithium battery, the box door can be opened during the installation of the distribution box, and the grounding resistance measuring device and the locking device can be powered in real time. The external power adapter is used to charge the lithium battery and power the grounding resistance measuring device and the locking device.

[0057] As Figures 1 to 4 shown, further, the grounding resistance measuring device 3 is a four-wire method grounding resistance measuring device.

[0058] The beneficial effect of adopting the above further technical solution is that by using the four-wire method for measurement, the influence of wire resistance and contact resistance is eliminated, ensuring the measurement accuracy.

[0059] Among them, the four-wire method grounding resistance measuring device may include: a first measuring electrode, a second measuring electrode, a third measuring electrode, a fourth measuring electrode, a signal processing circuit and a data transmission interface, and the first measuring electrode, the second measuring electrode, the third measuring electrode, the fourth measuring electrode and the data transmission interface are all connected to the signal processing circuit.

[0060] Both the first measuring electrode and the second measuring electrode are inserted into the ground layer, and both the third measuring electrode and the fourth measuring electrode are connected to the grounding wire 2.

[0061] The distance between the first measuring electrode and the second measuring electrode and the distance between the second measuring electrode and the grounding wire may both be 5 - 10 m. The second measuring electrode may be located between the first measuring electrode and the grounding wire.

[0062] The first measurement electrode may be a current electrode, and the second measurement electrode may be a voltage electrode.

[0063] As an alternative to the four-wire method grounding resistance measuring device 3 for the grounding resistance measuring device described above, the grounding resistance measuring device may also be a voltage ammeter method grounding resistance measuring device, a ratio meter method grounding resistance measuring device, or a bridge method grounding resistance measuring device.

[0064] As Figures 1 to 4 shown, further, the locking device 4 is an electromagnetic lock or a motor-driven lock. A motor 9 is installed in the motor-driven lock. The output shaft of the motor 9 is connected to a rotating rod 10 for mechanical unlocking. The free end of the rotating rod 10 is exposed outside the box body 1 or the box door 5. The locking device 4 is connected to a first switch 11 for cutting off the power supply of the electromagnetic lock to achieve unlocking, or the locking device 4 is connected to a second switch 12 for switching the rotation direction of the motor 9 in the motor-driven lock to achieve unlocking.

[0065] The beneficial effects of adopting the above further technical solutions are as follows: The locking device can adopt an electromagnetic lock or a motor-driven lock, with a simple structure and high reliability. The settings of the first switch and the second switch are used to unlock the locking device according to actual needs, preventing professional personnel from being unable to open the distribution box and perform installation and maintenance on the distribution box when the locking device is locked. The first switch is used to cut off the power supply of the electromagnetic lock, so that the locking device is unlocked. The second switch is used to control the reverse rotation of the motor, so that the motor-driven lock is automatically unlocked. The setting of the rotating rod is used to manually rotate the rotating rod to drive the motor to rotate according to actual needs in the case of power failure of the motor-driven lock, to achieve unlocking and locking.

[0066] Among them, the motor-driven lock may include: a motor, a gear, and a rack. The motor is installed on the box body or the box door. The gear is installed on the output shaft of the motor. The rack is slidably installed on the box body or the box door. The gear meshes with the rack. A jack adapted to the rack is correspondingly provided on the box door or the box body, and the rack is slidably inserted into the jack.

[0067] The cross-section of the free end of the rotating rod may be polygonal, which is convenient for rotating the rotating rod with a wrench or a handle. A through hole for the free end of the rotating rod to pass through may be provided on the box door or the box body.

[0068] A distribution box provided by an embodiment of the present invention may be a mobile distribution box, including a box body, a box door, a grounding resistance measuring device, a control device, a locking device, and a power supply device.

[0069] 1. Grounding resistance measuring device: used to measure the grounding resistance value of the distribution box in real time and transmit the measurement result to the control device.

[0070] Measure by the four - wire method to eliminate the influence of wire resistance and contact resistance and ensure the measurement accuracy.

[0071] The measuring device (grounding resistance measuring device) may include measuring electrodes, a signal processing circuit, and a data transmission interface.

[0072] 2. Control device: Receive the data from the grounding resistance measuring device (grounding resistance measuring device), and judge whether the grounding resistance exceeds the set threshold value (such as 10Ω).

[0073] If it exceeds the threshold value, send a locking signal to the locking device; if it does not exceed the threshold value, send an unlocking signal.

[0074] The control device can be implemented by a microcontroller (such as STM32, Arduino), and has data processing and logic control functions.

[0075] 3. Locking device: Lock or unlock the box door according to the signal of the control device.

[0076] When the grounding resistance exceeds the standard, the box door is automatically locked and cannot be opened.

[0077] The locking device can adopt an electromagnetic lock or a motor - driven lock, with a simple structure and high reliability.

[0078] 4. Power supply device: Provide a stable power supply for the entire system.

[0079] A lithium battery or an external power adapter can be adopted to adapt to different usage environments.

[0080] The power supply device may include a voltage - stabilizing circuit and an overload protection circuit to ensure the stable operation of the system.

[0081] By functions such as detecting the grounding resistance value and automatically locking the box door, the deficiency in the safety aspect of using a mobile distribution box in case of poor grounding is solved, and it has the following advantages:

[0082] 1. Reliability: Real - time monitor the grounding resistance value to ensure that the distribution box must have good grounding before use.

[0083] 2. Intelligence: Automatically judge and control through the control device to reduce manual intervention.

[0084] 3. Low cost: Simple structure, easy to implement, suitable for large - scale promotion.

[0085] 4. Safety: Automatically lock the box door in case of poor grounding to prevent misoperation and electric shock accidents.

[0086] 5. Adaptability: Suitable for various complex environments, such as construction sites, temporary power supply, etc.

[0087] Such as Figure 5As shown, in addition, the present invention also provides a control method for a distribution box. Based on any one of the above-described distribution boxes, the control method for the distribution box includes: measuring the grounding resistance value of the distribution box in real time; determining whether the grounding resistance value exceeds a set threshold; when the grounding resistance value exceeds the set threshold, locking the box door of the distribution box.

[0088] The beneficial effect of adopting the technical solution of the present invention is that the locking device is used to lock or unlock the box door. When the grounding resistance does not meet the requirements, the box door is locked and cannot be opened. The box door is controlled by measuring the grounding, ensuring that the distribution box must be well grounded before use. To improve the safety of the mobile distribution box.

[0089] Further, after the step of determining whether the grounding resistance value exceeds the set threshold, it includes: when the grounding resistance value does not exceed the set threshold, unlocking the box door of the distribution box.

[0090] The beneficial effect of adopting the above further technical solution is that when the grounding resistance value meets the requirements, the box door is unlocked and can be opened, and the distribution box can be used.

[0091] Further, the set threshold is 10 Ω or 4 Ω.

[0092] The beneficial effect of adopting the above further technical solution is that it is applicable to a variety of high and low voltage systems, expanding the scope of application.

[0093] The grounding resistance is the resistance encountered when the current flows from the grounding device into the earth and then flows through the earth to another grounding body or diffuses to a distance. The grounding resistance value reflects the good degree of contact between the electrical device and the "ground" and the scale of the grounding grid.

[0094] In the 380 / 220 V low voltage system, the grounding current generally does not exceed a few amperes, so it is stipulated that the grounding resistance shall not be greater than 4 ohms. When the capacity is below 100 kVA, the grounding resistance can be relaxed to not greater than 10 ohms.

[0095] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A distribution box, characterized in that, Comprising: A box body, a grounding wire, a grounding resistance measuring device, and a locking device. The locking device is installed on the box body. One end of the grounding wire is connected to the box body, the other end of the grounding wire is grounded, the grounding resistance measuring device is connected to the grounding wire, and the locking device is connected to the grounding resistance measuring device.

2. The distribution box according to claim 1, characterized in that, A box door is rotatably installed on one side of the box body. The locking device is installed on the box body, or the locking device is installed on the box body through the box door; a mechanical lock is installed on the box door or the box body.

3. A distribution box according to claim 1, characterized in that, The locking device is connected to the grounding resistance measuring device through a control device.

4. A distribution box according to claim 3, characterized in that, The control device is connected to a power supply device, and the power supply device is installed in the box body.

5. A distribution box according to claim 4, characterized in that, The power supply device includes: a lithium battery and an external power adapter. A voltage stabilizing circuit and an overload protection circuit are provided in the power supply device; both the lithium battery and the external power adapter are connected to the control device.

6. A distribution box according to claim 1, characterized in that, The grounding resistance measuring device is a four-wire method grounding resistance measuring device.

7. A distribution box according to claim 1, characterized in that, The locking device is an electromagnetic lock or a motor-driven lock. A motor is installed in the motor-driven lock. The output shaft of the motor is connected to a rotating rod for mechanical unlocking, and the free end of the rotating rod is exposed outside the box body or the box door; the locking device is connected to a first switch for cutting off the power of the electromagnetic lock to achieve unlocking or the locking device is connected to a second switch for switching the rotation direction of the motor in the motor-driven lock to achieve unlocking.

8. A control method for a distribution box, characterized in that, Based on the distribution box according to any one of the above claims 1 to 7, a distribution box control method includes: Real-time measuring the grounding resistance value of the distribution box; Judging whether the grounding resistance value exceeds a set threshold; When the grounding resistance value exceeds the set threshold, locking the box door of the distribution box.

9. A control method for a distribution box according to claim 8, characterized in that, After the step of judging whether the grounding resistance value exceeds the set threshold, including: when the grounding resistance value does not exceed the set threshold, unlocking the box door of the distribution box.

10. A control method for a distribution box according to claim 8, characterized in that, The set threshold is 10Ω or 4Ω.

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