Three-phase four-wire slide wire power supply protection circuit and slide wire power supply equipment

Abstract

The utility model provides a three-phase four-wire system sliding contact line power supply protection circuit and sliding contact line power supply equipment, the circuit comprises a three-phase four-wire system sliding contact line, a current collector, a contactor, a monitoring module and a control module, the current collector is arranged on the three-phase four-wire system sliding contact line, the first end of the contactor is connected with the current collector, the second end of the contactor provides power supply voltage to the outside, and the monitoring module is connected with the monitoring module. The power-off condition of the current collector is monitored through the power-on state of a coil of a relay in the monitoring module, and the control module controls the power-on state of a coil of the contactor based on a normally-open contact of the relay so as to control the on-off state of the contactor. The power-off condition of the current collector on the three-phase four-wire system slide wire is monitored in real time through the relay in the monitoring module, and the on-off of the contactor is controlled through the normally open contact of the relay in the control module, so that when the current collector of any phase slide wire falls off, the power supply voltage is cut off in time, the accident expansion is prevented, and the power supply safety is improved. The whole circuit is prevented from being burnt out, the equipment operation efficiency is improved, and the overhaul and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of busbar power supply, in particular to a three-phase four-wire busbar power supply protection circuit and busbar power supply equipment. Background Art

[0002] Some lifting and transportation machinery, assembly lines, etc. require mobile power supply equipment, because the mobile equipment needs to change positions at any time, and at different positions, the mobile equipment needs to obtain power supply in real time, otherwise it cannot be connected to the line and continue to move. Several busbars are laid in parallel along the running track of the mobile equipment to connect the power supply. The mobile equipment is set with a collector that can obtain power from the busbar. When the mobile equipment moves, the collector obtains power from the busbar. However, due to the influence of the external environment (such as material accumulation, overall deformation between the conductor and the collector, etc.), the collector between the mobile equipment and the busbar may malfunction or false trip during operation, that is, the collector is disconnected from the busbar and then quickly restored to power, and the collector is instantly powered off; but the maintenance personnel cannot detect the location of the fault. Even after the collector is instantly powered off, the mobile equipment will continue to move because it is not powered off. The collector that has been powered off during the movement will cause the suspension, connection box and other related accessories on the entire busbar to be seriously damaged. The collector itself is also likely to have a grounding fault, and in severe cases, the entire busbar will be burned.

[0003] Therefore, how to provide a busbar protection power supply circuit that can quickly locate the location where an abnormality occurs and cut off the power supply circuit in time is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the utility model provides a three-phase four-wire busbar power supply protection circuit and a busbar power supply device to solve at least one of the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by this application is as follows.

[0006] On the one hand, the present application provides a three-phase four-wire busbar power supply protection circuit, which includes a three-phase four-wire busbar, a collector, a contactor, a monitoring module for detecting power failure of the collector based on a relay coil, and a control module for controlling the coil of the contactor according to the normally open contact of the relay. The collector is arranged on the three-phase four-wire busbar, the first end of the contactor is connected to the collector on the three-phase four-wire busbar, the second end of the contactor is used to provide a power supply voltage to the outside, the monitoring module is connected to the three-phase four-wire busbar, and the control module is connected to the first end of the contactor.

[0007] In one embodiment of the utility model, the three-phase four-wire busbar includes a first-phase incoming busbar, a second-phase incoming busbar, a third-phase incoming busbar and a neutral line, and the collector is arranged on one of the three-phase incoming busbars and the neutral line.

[0008] In one embodiment of the utility model, the contactor includes a first contactor and a second contactor, the first end of the first contactor is connected to the collector on the three-phase incoming bus, the first end of the second contactor is connected to the neutral line, and the second end of the first contactor and the second end of the second contactor cooperate to output the power supply voltage to the outside.

[0009] In one embodiment of the utility model, the monitoring module includes a first relay, a second relay and a third relay, the first end of the first relay is connected to the first phase incoming line bus, the second end of the first relay is connected to the neutral line via the coil of the first relay, the first end of the second relay is connected to the second phase incoming line bus, the second end of the second relay is connected to the neutral line via the coil of the second relay, the first end of the third relay is connected to the third phase incoming line bus, and the second end of the third relay is connected to the neutral line via the coil of the third relay.

[0010] In one embodiment of the utility model, the control module includes the coil of the contactor, the normally open contact of the first relay, the normally open contact of the second relay, and the normally open contact of the third relay. The first end of the coil of the contactor is connected to the first end of the first contactor, and the second end of the coil of the contactor is connected to the first end of the second contactor via the normally open contact of the first relay, the normally open contact of the second relay, and the normally open contact of the third relay.

[0011] In one embodiment of the utility model, the control module also includes a stop switch and a self-locking switch, the first end of the stop switch is connected to the first end of the first contactor, and the second end of the stop switch is connected to the first end of the coil of the contactor through the self-locking switch.

[0012] On the other hand, the present application also provides a busbar power supply device, which includes the three-phase four-wire busbar power supply protection circuit as described above.

[0013] The present application provides a three-phase four-wire busbar power supply protection circuit and busbar power supply equipment, the circuit includes a three-phase four-wire busbar, a collector, a contactor, a monitoring module and a control module, the collector is arranged on the three-phase four-wire busbar, the first end of the contactor is connected to the collector, the second end of the contactor provides a power supply voltage to the outside, the power-off condition of the collector is monitored by the power-on state of the coil of the relay in the monitoring module, and the control module controls the power-on state of the coil of the contactor based on the normally open contact of the relay to control the on and off of the contactor. The present application monitors the power-off condition of the collector on the three-phase four-wire busbar in real time through the relay in the monitoring module, and controls the on and off of the contactor through the normally open contact of the relay in the control module, so as to realize that when the collector of any phase busbar falls, the power supply voltage is disconnected in time to prevent the accident from expanding, so as to avoid the burning of the entire line, improve the equipment operation efficiency, and reduce the inspection and maintenance costs.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the drawings described below are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0016] Figure 1 It is a block diagram of a three-phase four-wire busbar power supply protection circuit shown in an exemplary embodiment of the utility model;

[0017] Figure 2 It is a specific structural diagram of a three-phase four-wire busbar power supply protection circuit shown in an exemplary embodiment of the utility model. DETAILED DESCRIPTION

[0018] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0020] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0021] Some lifting and transportation machinery, assembly lines, etc. require mobile power supply equipment, because the mobile equipment needs to change positions at any time, and at different positions, the mobile equipment needs to obtain power supply in real time, otherwise it cannot be connected to the line and continue to move. Several busbars are laid in parallel along the running track of the mobile equipment to connect the power supply. The mobile equipment is set with a collector that can obtain power from the busbar. When the mobile equipment moves, the collector obtains power from the busbar. However, due to the influence of the external environment (such as material accumulation, overall deformation between the conductor and the collector, etc.), the collector between the mobile equipment and the busbar may malfunction or false trip during operation, that is, the collector is disconnected from the busbar and then quickly restored to power, and the collector is instantly powered off; but the maintenance personnel cannot detect the location of the fault. Even after the collector is instantly powered off, the mobile equipment will continue to move because it is not powered off. The collector that has been powered off during the movement will cause the suspension, connection box and other related accessories on the entire busbar to be seriously damaged. The collector itself is also likely to have a grounding fault, and in severe cases, the entire busbar will be burned.

[0022] To solve the above problems, Figure 1 As shown, the present application provides a three-phase four-wire busbar power supply protection circuit, which includes a three-phase four-wire busbar, a collector, a contactor, a monitoring module for detecting power failure of the collector based on a relay coil, and a control module for controlling the coil of the contactor according to the normally open contact of the relay. The collector is arranged on the three-phase four-wire busbar, the first end of the contactor is connected to the collector on the three-phase four-wire busbar, the second end of the contactor is used to provide a power supply voltage VCC to the outside, the monitoring module is connected to the three-phase four-wire busbar, and the control module is connected to the first end of the contactor.

[0023] In detail, Figure 2As shown, the three-phase four-wire busbar includes a first-phase incoming busbar L1, a second-phase incoming busbar L2, a third-phase incoming busbar L3 and a neutral line PEN, and a collector is provided on one of the three-phase incoming busbars (L1, L2, L3) and the neutral line PEN. Specifically, a collector KJ1 can be provided on the first-phase incoming busbar L1, a collector KJ2 can be provided on the second-phase incoming busbar L2, or a collector KJ3 can be provided on the third-phase incoming busbar L3, and a collector KJ4 can be provided on the neutral line PEN. Figure 2 As shown, a collector KJ3 is arranged on the third-phase incoming bus L3 and a collector KJ4 is arranged on the neutral line PEN, forming a power supply loop with the contactor to provide a power supply voltage VCC to the outside.

[0024] In more detail, the contactor includes a first contactor and a second contactor, the first end of the first contactor is connected to the collector on the three-phase incoming bus, the first end of the second contactor is connected to the collector on the neutral line, and the second end of the first contactor and the second end of the second contactor cooperate to output the power supply voltage externally. Figure 2 As shown, the contactor includes a first contactor KM1 and a second contactor KM2. The first end of the first contactor KM1 is connected to the collector KJ1 on the first phase incoming bus L1, the collector KJ2 on the second phase incoming bus L2, or the collector KJ3 on the third phase incoming bus L3. The first end of the second contactor KM2 is connected to the collector KJ4 on the neutral line PEN. The second end of the first contactor KM1 is the positive electrode of the power supply voltage VCC, and the second end of the second contactor KM2 is the negative electrode of the power supply voltage VCC. The mobile device is powered by the power supply voltage VCC. Figure 2 As shown, the dotted line indicates that the first end of the first contactor KM1 can also be connected to the collector KJ1 on the first phase incoming bus L1 or the collector KJ2 on the second phase incoming bus L2.

[0025] In detail, the monitoring module includes a first relay K1, a second relay K2 and a third relay K3. The first end of the first relay K1 is connected to the first-phase incoming bus L1, and the second end of the first relay K1 is connected to the neutral line PEN via the coil KA1 of the first relay. The first end of the second relay K2 is connected to the second-phase incoming bus L2, and the second end of the second relay K2 is connected to the neutral line PEN via the coil KA2 of the second relay. The first end of the third relay K3 is connected to the third-phase incoming bus L3, and the second end of the third relay K3 is connected to the neutral line PEN via the coil KA3 of the third relay.

[0026] In detail, the control module includes a coil KAM of the contactor, a normally open contact KA11 of the first relay, a normally open contact KA21 of the second relay, and a normally open contact KA31 of the third relay. The first end of the coil KAM of the contactor is connected to the first end of the first contactor KM1, and the second end of the coil KAM of the contactor is connected to the first end of the second contactor KM2 via the normally open contact KA11 of the first relay, the normally open contact KA21 of the second relay, and the normally open contact KA31 of the third relay.

[0027] In more detail, the control module also includes a stop switch TA and a self-locking switch QA_QA1. The first end of the stop switch TA is connected to the first end of the first contactor KM1. The second end of the stop switch TA is connected to the first end of the coil KAM of the contactor via the self-locking switch QA_QA1.

[0028] like Figure 1 to Figure 2 As shown, the working principle of the three-phase four-wire busbar power supply protection circuit provided in this application is as follows:

[0029] When the circuit is powered on for the first time, the first relay K1, the second relay K2, and the third relay K3 need to be manually closed, the normally open contacts corresponding to the three relays are closed, the stop switch TA is normally closed, and the button QA of the self-locking switch is manually closed to make the switch part QA1 of the self-locking switch in the on state. Figure 2 As shown, when the contactor (KM1, KM2) is closed, the coil KAM of the contact head is closed, and the mobile device is powered through the third-phase incoming bus L3 and the neutral line PEN, and the coil KA1 of the first relay is in the on-off state. If the collector KJ3 on the third-phase incoming bus L3 is powered off, the coil KA1 of the first relay is in the off-state, the normally open contact KA11 of the first relay is disconnected, the coil KAM of the contact head is disconnected, and the contactor (KM1, KM2) is disconnected, and the power supply to the mobile device is stopped; by the same token, if the mobile device is powered through the first-phase incoming bus L1 or the second-phase incoming bus L2 and the neutral line PEN, the corresponding incoming bus The coil of the upper relay is energized. When the collector KJ1 on the first-phase incoming bus L1 or the collector KJ2 on the second-phase incoming bus L2 is powered off, the corresponding relay coil is powered off, the normally open contact of the corresponding relay is disconnected, the contactor (KM1, KM2) is disconnected, and the power supply to the mobile device is stopped; if the collector on the neutral line PEN is powered off, the coil of the first relay, the coil of the second relay and the coil of the third relay are powered off at the same time, the normally open contacts of the three relays are disconnected, the contactors (KM1, KM2) are disconnected, and the power supply to the mobile device is stopped, so that any group of the four incoming collectors can be shut down in time if it loses power, thereby avoiding the expansion of the accident.

[0030] The present application also provides a busbar power supply device, including the three-phase four-wire busbar power supply protection circuit as described above, which is convenient for cutting off the power supply voltage output by the busbar power supply device.

[0031] The present application provides a three-phase four-wire busbar power supply protection circuit and busbar power supply equipment, the circuit includes a three-phase four-wire busbar, a collector, a contactor, a monitoring module and a control module, the collector is arranged on the three-phase four-wire busbar, the first end of the contactor is connected to the collector, the second end of the contactor provides a power supply voltage to the outside, the power-off condition of the collector on the three-phase four-wire busbar is monitored by the power-on state of the coil of the relay in the monitoring module, and the control module controls the power-on state of the coil of the contactor based on the normally open contact of the relay to control the on and off of the contactor. The present application monitors the power-off condition of the collector on the three-phase four-wire busbar in real time through the relay in the monitoring module, and controls the on and off of the contactor through the normally open contact of the relay in the control module, so that when the collector of any phase busbar falls, the power supply voltage is disconnected in time, the power supply to the mobile device is stopped, and the accident is prevented from expanding, so as to avoid the overall line from being burned, improve the equipment operation efficiency, reduce the inspection and maintenance costs, significantly reduce the number of equipment shutdowns, and directly improve the production efficiency.

[0032] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A three-phase four-wire busbar power supply protection circuit, characterized in that: The protection circuit includes a three-phase four-wire busbar, a collector, a contactor, a monitoring module for detecting power failure of the collector based on a coil of a relay, and a control module for controlling the coil of the contactor according to a normally open contact of the relay. The collector is arranged on the three-phase four-wire busbar, the first end of the contactor is connected to the collector on the three-phase four-wire busbar, the second end of the contactor is used to provide a power supply voltage to the outside, the monitoring module is connected to the three-phase four-wire busbar, and the control module is connected to the first end of the contactor.

2. The three-phase four-wire busbar power supply protection circuit according to claim 1 is characterized in that: The three-phase four-wire busbar includes a first-phase incoming busbar, a second-phase incoming busbar, a third-phase incoming busbar and a neutral line, and the collector is arranged on one of the three-phase incoming busbars and the neutral line.

3. The three-phase four-wire busbar power supply protection circuit according to claim 2 is characterized in that: The contactor includes a first contactor and a second contactor, wherein the first end of the first contactor is connected to the collector on the three-phase incoming bus, the first end of the second contactor is connected to the collector on the neutral line, and the second end of the first contactor and the second end of the second contactor cooperate to output the power supply voltage to the outside.

4. The three-phase four-wire busbar power supply protection circuit according to claim 3 is characterized in that: The monitoring module includes a first relay, a second relay and a third relay, wherein the first end of the first relay is connected to the first phase incoming line bus, the second end of the first relay is connected to the neutral line via the coil of the first relay, the first end of the second relay is connected to the second phase incoming line bus, the second end of the second relay is connected to the neutral line via the coil of the second relay, the first end of the third relay is connected to the third phase incoming line bus, and the second end of the third relay is connected to the neutral line via the coil of the third relay.

5. The three-phase four-wire busbar power supply protection circuit according to claim 4, characterized in that: The control module includes the coil of the contactor, the normally open contact of the first relay, the normally open contact of the second relay, and the normally open contact of the third relay. The first end of the coil of the contactor is connected to the first end of the first contactor, and the second end of the coil of the contactor is connected to the first end of the second contactor via the normally open contact of the first relay, the normally open contact of the second relay, and the normally open contact of the third relay.

6. The three-phase four-wire busbar power supply protection circuit according to claim 5, characterized in that: The control module further includes a stop switch and a self-locking switch. The first end of the stop switch is connected to the first end of the first contactor, and the second end of the stop switch is connected to the first end of the coil of the contactor via the self-locking switch.

7. A busbar power supply device, characterized in that: It comprises a three-phase four-wire busbar power supply protection circuit as described in any one of claims 1-6.

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