Incoming wire protection device of motor control center cabinet

Abstract

The utility model relates to an incoming line protection device of a motor control center cabinet, which comprises a plurality of bus end control switches, a plurality of bus section isolation transformers and a plurality of circuit breakers, the plurality of bus end control switches are in one-to-one correspondence with the plurality of bus section isolation transformers, the plurality of circuit breakers are in one-to-one correspondence with the plurality of bus section isolation transformers, and the plurality of circuit breakers are in one-to-one correspondence with the plurality of bus section isolation transformers. The plurality of circuit breakers are in one-to-one correspondence with the plurality of drawer switch cabinets; one end of each bus end control switch is connected with a power bus, the other end of each bus end control switch is electrically connected with an input winding of the corresponding bus section isolation transformer, and an output winding of each bus section isolation transformer is electrically connected with an input end of the corresponding circuit breaker. The output ends of the circuit breakers are electrically connected with the power input ends of the corresponding motor control center cabinets. According to the utility model, the technical problem that the power supplies of the drawer switch cabinets of the same MCC cabinet influence each other is solved, and the safe power supply performance of the MCC cabinet is improved.

Description

Technical Field

[0001] This utility model relates to the field of power safety technology, specifically to an incoming line protection device for a motor control center cabinet. Background Technology

[0002] MCC cabinet, or Motor Control Center cabinet, is a type of power distribution cabinet. It is primarily used for centralized control of motors and other equipment within a building, enabling power distribution, monitoring, and protection. A typical MCC cabinet consists of several drawer-type switchgear, each with several power supply units. Each power supply unit includes switching, isolation, protection, and signal cable connection facilities. In current technology, the drawer-type switchgear within the same MCC cabinet shares the same power supply busbar. This can lead to mutual interference between the power supplies of different drawer-type switchgear within the same MCC cabinet. For example, a short circuit in one drawer-type switchgear within the same MCC cabinet may cause the circuit breaker on the power supply busbar to cut off the power supply, resulting in the power supply to all drawer-type switchgear within the entire MCC cabinet being cut off. Consequently, all motors and other equipment within the entire MCC cabinet cannot be effectively controlled or monitored. Utility Model Content

[0003] In order to solve the technical problems in the prior art, such as the mutual interference of power supply between the various drawer switch cabinets of the same MCC cabinet, this utility model provides an incoming line protection device for a motor control center cabinet.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] An incoming line protection device for a motor control center cabinet, the motor control center cabinet including multiple drawer switch cabinets, the incoming line protection device including multiple bus end control switches, multiple bus section isolation transformers and multiple circuit breakers, the multiple bus end control switches corresponding one-to-one with the multiple bus section isolation transformers, the multiple circuit breakers corresponding one-to-one with the multiple bus section isolation transformers, and the multiple circuit breakers corresponding one-to-one with the multiple drawer switch cabinets;

[0006] One end of each busbar control switch is connected to the power busbar, and the other end of each busbar control switch is electrically connected to the input winding of the corresponding busbar segment isolation transformer. The output winding of each busbar segment isolation transformer is electrically connected to the input terminal of the corresponding circuit breaker, and the output terminal of the circuit breaker is electrically connected to the power input terminal of the corresponding drawer switch cabinet.

[0007] The beneficial effects of this utility model are as follows: By setting up multiple isolation transformers and connecting them to the power supply bus, and then connecting each isolation transformer to each drawer switch cabinet of the motor control center cabinet, each isolation transformer supplies power to its respective drawer switch cabinet. Since the input and output terminals of the isolation transformers do not affect each other, the power supply to each drawer switch cabinet is independent. Even if a drawer switch cabinet experiences a short circuit or other electrical fault, its current will be cut off by the isolation transformer, preventing the current at the power supply terminal of the faulty drawer switch cabinet from affecting the current or voltage of the power supply bus in reverse. For example, even if an overcurrent occurs at the power supply terminal of the faulty drawer switch cabinet, the current on its power supply bus will not be affected. Therefore, this utility model solves the technical problem of mutual interference in the power supply of each drawer switch cabinet in the same MCC cabinet, and improves the safe power supply performance of the MCC cabinet.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, it also includes multiple switch section isolation transformers, each of which corresponds one-to-one with a multiple bus section isolation transformer. The input winding of each switch section isolation transformer is electrically connected to the output winding of the corresponding bus section isolation transformer, and the output winding of each switch section isolation transformer is electrically connected to the input terminal of the corresponding circuit breaker.

[0010] The beneficial effect of adopting the above-mentioned further scheme is that by setting up multiple switch section isolation transformers, two isolation transformers connected in series can be used to supply power to the corresponding drawer switch cabinet, and the power supply voltage of the corresponding drawer switch cabinet can be adjusted by adjusting the transformation ratio of the two isolation transformers connected in series.

[0011] Furthermore, multiple switching section isolation transformers are arranged in sequence, and a cross-power supply isolation transformer is provided between two adjacent switching section isolation transformers; among the two adjacent switching section isolation transformers, the output winding of one switching section isolation transformer is electrically connected to the output winding of the cross-power supply isolation transformer, and the input winding of the other switching section isolation transformer is electrically connected to the input winding of the cross-power supply isolation transformer.

[0012] The beneficial effect of adopting the above-mentioned further solution is that, by setting up a cross-power supply isolation transformer, one of the power supply lines of the drawer cabinets corresponding to the isolation transformers of two adjacent switch sections can provide auxiliary power supply to the other line. This prevents the power supply line corresponding to the drawer cabinet from losing power, and can be powered by the power supply line that supplies power to another drawer cabinet, thereby improving the stability of power supply.

[0013] Furthermore, all the switching section isolation transformers have the same transformation ratio, and the transformation ratio of the cross-power supply isolation transformer is equal to that of the switching section isolation transformer.

[0014] The beneficial effect of adopting the above-mentioned further solution is that by making the transformation ratio of the cross-power supply isolation transformer equal to that of the switch section isolation transformer, the power supply voltage of the main power supply line and the auxiliary power supply line of the drawer switchgear can be kept consistent. The main power supply line refers to the power supply line where the switch section isolation transformer corresponding to the drawer switchgear is located, and the auxiliary power supply line refers to the power supply line where the cross-power supply isolation transformer is located.

[0015] Furthermore, it also includes multiple cabinet-end control switches, each of which corresponds one-to-one with a multiple drawer switch cabinet; one end of each cabinet-end control switch is electrically connected to the output terminal of the circuit breaker corresponding to the drawer switch cabinet, and the other end of each cabinet-end control switch is electrically connected to the power input terminal of the corresponding drawer switch cabinet.

[0016] The beneficial effect of adopting the above-mentioned further solution is that by setting a cabinet-side control switch between the circuit breaker and the drawer switch cabinet, the power supply line of the corresponding cabinet can be directly cut off through the cabinet-side control switch.

[0017] Furthermore, the control switch at the cabinet end is a low-voltage disconnect switch.

[0018] Furthermore, the transformation ratios of all the busbar isolation transformers are equal.

[0019] The beneficial effect of adopting the above-mentioned further solution is that, when the voltage of each drawer switch cabinet is equal, and when the transformation ratio of all the bus section isolation transformers is equal, the power supply circuits between each drawer switch cabinet can be shared, thereby reducing the risk of power failure.

[0020] Furthermore, each of the busbar segment isolation transformers is a dry-type isolation transformer.

[0021] The beneficial effect of adopting the above-mentioned further solution is that the dry-type isolation transformer can block the transmission of some harmonics and reduce interference to other equipment by using a specific wiring method (such as Y / Δ wiring).

[0022] To solve the above-mentioned technical problems, this utility model also provides a motor control center cabinet, the specific technical contents of which are as follows:

[0023] A motor control center cabinet includes an incoming line protection device for the aforementioned motor control center cabinet.

[0024] To solve the above-mentioned technical problems, this utility model also provides a motor control system, the specific technical contents of which are as follows:

[0025] A motor control system includes multiple motor control center cabinets and multiple incoming line protection devices for the motor control center cabinets; each of the multiple motor control center cabinets corresponds one-to-one with the multiple incoming line protection devices, and each motor control center cabinet is electrically connected to the corresponding incoming line protection device. Attached Figure Description

[0026] Figure 1 This is an example of an incoming line protection device for a motor control center cabinet in this utility model embodiment;

[0027] Figure 2 This is a second inlet protection device for a motor control center cabinet in this embodiment of the present utility model;

[0028] Figure 3 This is a structural schematic diagram of a motor control center cabinet according to an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the structure of a motor control system according to an embodiment of the present invention. Detailed Implementation

[0030] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0031] like Figure 1 As shown, this embodiment provides an incoming line protection device for a motor control center cabinet. The motor control center cabinet includes multiple drawer switch cabinets. The incoming line protection device includes multiple bus end control switches, multiple bus section isolation transformers, and multiple circuit breakers. The multiple bus end control switches correspond one-to-one with the multiple bus section isolation transformers, the multiple circuit breakers correspond one-to-one with the multiple bus section isolation transformers, and the multiple circuit breakers correspond one-to-one with the multiple drawer switch cabinets.

[0032] One end of each busbar control switch is connected to the power busbar, and the other end of each busbar control switch is electrically connected to the input winding of the corresponding busbar segment isolation transformer. The output winding of each busbar segment isolation transformer is electrically connected to the input terminal of the corresponding circuit breaker, and the output terminal of the circuit breaker is electrically connected to the power input terminal of the corresponding drawer switch cabinet.

[0033] The multiple bus end control switches are respectively the first bus end control switch CD1, the second bus end control switch CD2, the third bus end control switch CD3, and the fourth bus end control switch CD4; the multiple bus section isolation transformers are respectively the first bus section isolation transformer TA1, the second bus section isolation transformer TA2, the third bus section isolation transformer TA3, and the fourth bus section isolation transformer TA4; the multiple circuit breakers are respectively the first circuit breaker, the second circuit breaker, the third circuit breaker, and the fourth circuit breaker; and the multiple drawer switch cabinets are respectively the first drawer switch cabinet, the second drawer switch cabinet, the third drawer switch cabinet, and the fourth drawer switch cabinet.

[0034] One end of the first busbar control switch CD1 is connected to the power busbar, and the other end of the first busbar control switch CD1 is electrically connected to the input winding of the first busbar section isolation transformer TA1. The output winding of the first busbar section isolation transformer TA1 is electrically connected to the input terminal of the first circuit breaker, and the output terminal of the first circuit breaker is electrically connected to the power input terminal of the first drawer switch cabinet.

[0035] One end of the second busbar control switch CD2 is connected to the power busbar, and the other end of the second busbar control switch CD2 is electrically connected to the input winding of the second busbar isolation transformer TA2. The output winding of the second busbar isolation transformer TA2 is electrically connected to the input terminal of the second circuit breaker, and the output terminal of the second circuit breaker is electrically connected to the power input terminal of the second drawer switch cabinet.

[0036] One end of the third busbar control switch CD3 is connected to the power busbar, and the other end of the third busbar control switch CD3 is electrically connected to the input winding of the third busbar isolation transformer TA3. The output winding of the third busbar isolation transformer TA3 is electrically connected to the input terminal of the third circuit breaker, and the output terminal of the third circuit breaker is electrically connected to the power input terminal of the third drawer switch cabinet.

[0037] One end of the fourth busbar control switch CD4 is connected to the power busbar, and the other end of the fourth busbar control switch CD4 is electrically connected to the input winding of the fourth busbar isolation transformer TA4. The output winding of the fourth busbar isolation transformer TA4 is electrically connected to the input terminal of the fourth circuit breaker, and the output terminal of the fourth circuit breaker is electrically connected to the power input terminal of the fourth drawer switch cabinet.

[0038] like Figure 2In some embodiments, the incoming line protection device further includes multiple switch section isolation transformers, each corresponding one-to-one with a multiple busbar section isolation transformer. The input winding of each switch section isolation transformer is electrically connected to the output winding of the corresponding busbar section isolation transformer, and the output winding of each switch section isolation transformer is electrically connected to the input terminal of the corresponding circuit breaker. By setting multiple switch section isolation transformers, two isolation transformers connected in series can be used to supply power to the corresponding drawer switchgear, facilitating the adjustment of the power supply voltage of the corresponding drawer switchgear by adjusting the transformation ratio of the two series-connected isolation transformers.

[0039] Multiple switch section isolation transformers are arranged sequentially, with a cross-power supply isolation transformer positioned between two adjacent switch section isolation transformers. Of the two adjacent switch section isolation transformers, the output winding of one is electrically connected to the output winding of the cross-power supply isolation transformer, and the input winding of the other is electrically connected to the input winding of the cross-power supply isolation transformer. By using the cross-power supply isolation transformer, one of the power supply lines for the drawer cabinets corresponding to two adjacent switch section isolation transformers can provide auxiliary power to the other line. This prevents power supply failure in the drawer cabinet's corresponding power supply line from being used to supply power to another drawer cabinet, thus improving power supply stability.

[0040] The multiple switch section isolation transformers are designated as the first switch section isolation transformer TB1, the second switch section isolation transformer TB2, the third switch section isolation transformer TB3, and the fourth switch section isolation transformer TB4; the multiple cross-power supply isolation transformers are designated as the first cross-power supply isolation transformer TC1, the second cross-power supply isolation transformer TC2, and the third cross-power supply isolation transformer TC3.

[0041] The input winding of the first switch section isolation transformer TB1 is electrically connected to the output winding of the first bus section isolation transformer TA1, and the output windings of the first switch section isolation transformer TB1 and the first cross power supply isolation transformer TC1 are both electrically connected to the input terminal of the first circuit breaker.

[0042] The input windings of the first cross-power supply isolation transformer TC1 and the second switch section isolation transformer TB2 are both electrically connected to the output windings of the second bus section isolation transformer TA2. The output windings of the second switch section isolation transformer TB2 and the second cross-power supply isolation transformer TC2 are both electrically connected to the input terminal of the second circuit breaker.

[0043] The input windings of the second cross-supply isolation transformer TC2 and the third switch section isolation transformer TB3 are both electrically connected to the output winding of the third bus section isolation transformer TA3. The output windings of the third switch section isolation transformer TB3 and the third cross-supply isolation transformer TC3 are both electrically connected to the input terminal of the third circuit breaker.

[0044] The input windings of the third cross-connection isolation transformer TC3 and the fourth switch section isolation transformer TB4 are both electrically connected to the output winding of the fourth bus section isolation transformer TA4; the output winding of the fourth switch section isolation transformer TB4 is electrically connected to the input terminal of the fourth circuit breaker. By setting two isolation transformers in parallel, one of the two parallel isolation transformers is connected to one drawer switch cabinet, while the other isolation transformer is connected to other drawer switch cabinets, providing dual power supply to a single drawer switch cabinet and preventing power loss to the switch cabinet due to the failure of a single power supply.

[0045] For example, when the first busbar section isolation transformer TA1 and the first switch section isolation transformer TB1 are both working normally, the alternating current on the busbar can sequentially pass through the first cabinet end control switch CD1, the first busbar section isolation transformer TA1, the first switch section isolation transformer TB1, the first circuit breaker, and the cabinet end control switch CK1 to supply power to the first drawer switch cabinet.

[0046] In some embodiments, the transformation ratio of the first switch section isolation transformer TB1 is equal to the transformation ratio of the first cross-supply isolation transformer TC1; the transformation ratio of the second switch section isolation transformer TB2 is equal to the transformation ratio of the second cross-supply isolation transformer TC2; and the transformation ratio of the third switch section isolation transformer TB3 is equal to the transformation ratio of the third cross-supply isolation transformer TC3. By setting the transformation ratios of each switch section isolation transformer to be equal, the power supply circuits between each drawer switch cabinet can be shared, thereby reducing the risk of power failure.

[0047] In some embodiments, the transformation ratios of all the busbar isolation transformers are equal. When the voltage requirements of each drawer switchgear are equal, having equal transformation ratios for all the busbar isolation transformers allows for power circuit sharing between the drawer switchgears, reducing the risk of power outages. Each busbar isolation transformer is a dry-type isolation transformer. The input voltage to output voltage ratio of the dry-type isolation transformer is 1:1. By using a specific wiring method (such as Y / Δ wiring), the dry-type isolation transformer can block some harmonic transmission, reducing interference to other equipment.

[0048] All the switch section isolation transformers have the same transformation ratio, and the transformation ratio of the cross-power supply isolation transformer is equal to that of the switch section isolation transformers. In this embodiment, since all the bus section isolation transformers have the same transformation ratio, the transformation ratio of the cross-power supply isolation transformer is equal to that of the switch section isolation transformers, ensuring that the main power supply line and the auxiliary power supply line of the drawer switch cabinet maintain consistent power supply voltage. The main power supply line refers to the power supply line where the switch section isolation transformer corresponding to the drawer switch cabinet is located, and the auxiliary power supply line refers to the power supply line where the cross-power supply isolation transformer is located.

[0049] In some embodiments, the incoming line protection device further includes a plurality of cabinet-end control switches, each of which corresponds one-to-one with a plurality of drawer switch cabinets; one end of each cabinet-end control switch is electrically connected to the output terminal of the circuit breaker corresponding to the corresponding drawer switch cabinet, and the other end of each cabinet-end control switch is electrically connected to the power input terminal of the corresponding drawer switch cabinet. The multiple cabinet-end control switches are designated as first cabinet-end control switch CK1, second cabinet-end control switch CK2, third cabinet-end control switch CK3, and fourth cabinet-end control switch CK4. One end of the first cabinet-end control switch CK1 is electrically connected to the output terminal of the first circuit breaker, and the other end is electrically connected to the power input terminal of the first drawer switch cabinet. One end of the second cabinet-end control switch CK2 is electrically connected to the output terminal of the second circuit breaker, and the other end is electrically connected to the power input terminal of the second drawer switch cabinet. One end of the third cabinet-end control switch CK3 is electrically connected to the output terminal of the third circuit breaker, and the other end is electrically connected to the power input terminal of the third drawer switch cabinet. One end of the fourth cabinet-end control switch CK4 is electrically connected to the output terminal of the fourth circuit breaker, and the other end is electrically connected to the power input terminal of the fourth drawer switch cabinet. By installing cabinet-end control switches between the circuit breaker and the drawer switch cabinet, the power supply line to the corresponding cabinet can be directly cut off via the cabinet-end control switches. The control switch at the cabinet end is a low-voltage disconnect switch. Specifically, the low-voltage disconnect switch can be a low-voltage fuse-type disconnect switch.

[0050] This invention, through the installation of multiple isolation transformers connected to the power supply bus, and the connection of each isolation transformer to each drawer switch cabinet of the motor control center cabinet, allows each isolation transformer to supply power to its respective drawer switch cabinet. Since the input and output terminals of the isolation transformers do not interfere with each other, each drawer switch cabinet receives independent power. Even if a drawer switch cabinet experiences a short circuit or other electrical fault, its current is cut off by the isolation transformer, preventing the current at the power supply terminal of the faulty drawer switch cabinet from affecting the current or voltage of the power supply bus in reverse. For example, even if an overcurrent occurs at the power supply terminal of a faulty drawer switch cabinet, the current on its power supply bus will not be affected. Therefore, this invention solves the technical problem of mutual interference in the power supply of different drawer switch cabinets within the same MCC cabinet, improving the safe power supply performance of the MCC cabinet.

[0051] like Figure 3 As shown, in some other embodiments, a motor control center cabinet is also provided, including the aforementioned incoming line protection device for the motor control center cabinet. In this embodiment, the motor control center cabinet includes multiple incoming line protection devices and multiple drawer switch cabinets. The power supply interface of each drawer switch cabinet is electrically connected to the power supply terminal of the incoming line protection device, and the power supply input terminal of the incoming line protection device is connected to the power supply bus.

[0052] like Figure 4 As shown, in some other embodiments, a motor control system is also provided, including multiple motor control center cabinets and multiple incoming line protection devices for the motor control center cabinets; the multiple motor control center cabinets correspond one-to-one with the multiple incoming line protection devices, and each motor control center cabinet is electrically connected to the corresponding incoming line protection device.

[0053] When multiple motor control center cabinets are installed, each motor control center cabinet can be equipped with an incoming line protection device. Through the isolation effect of the isolation transformer in the incoming line protection device, the power supply between the various motor control center cabinets can be prevented from interfering with each other, thereby improving the power supply stability of each motor control center cabinet.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An incoming line protection device for a motor control center cabinet, the motor control center cabinet comprising multiple drawer switch cabinets, characterized in that: The incoming line protection device comprises a plurality of bus end control switches, a plurality of bus section isolation transformers, and a plurality of circuit breakers, the plurality of bus end control switches correspond one-to-one to the plurality of bus section isolation transformers, the plurality of circuit breakers correspond one-to-one to the plurality of bus section isolation transformers, and the plurality of circuit breakers correspond one-to-one to the plurality of drawer switch cabinets. One end of each bus end control switch is connected to a power bus, and the other end of each bus end control switch is electrically connected to an input winding of a corresponding bus section isolation transformer. An output winding of each bus section isolation transformer is electrically connected to an input end of a corresponding circuit breaker, and an output end of the circuit breaker is electrically connected to a power input end of a corresponding drawer switch cabinet.

2. The line protection device for a motor control center cabinet of claim 1, wherein: The device further comprises a plurality of switch section isolation transformers, the plurality of switch section isolation transformers correspond one-to-one to the plurality of bus section isolation transformers, an input winding of each switch section isolation transformer is electrically connected to an output winding of a corresponding bus section isolation transformer, and an output winding of each switch section isolation transformer is electrically connected to an input end of a corresponding circuit breaker.

3. The line protection device for a motor control center cabinet of claim 2, wherein: The plurality of switch section isolation transformers are arranged in sequence, and a cross-power supply isolation transformer is arranged between two adjacent switch section isolation transformers. An output winding of one of the two adjacent switch section isolation transformers is electrically connected to an output winding of the cross-power supply isolation transformer, and an input winding of the other switch section isolation transformer is electrically connected to an input winding of the cross-power supply isolation transformer.

4. The incoming line protection device of the motor control center cabinet according to claim 3, wherein: The voltage transformation ratios of all the switch section isolation transformers are equal, and the voltage transformation ratio of the cross-power supply isolation transformer is equal to the voltage transformation ratio of the switch section isolation transformers.

5. The line protection device for a motor control center cabinet of claim 1, wherein: The device further comprises a plurality of cabinet end control switches, the plurality of cabinet end control switches correspond one-to-one to the plurality of drawer switch cabinets, one end of each cabinet end control switch is electrically connected to an output end of a corresponding circuit breaker of a corresponding drawer switch cabinet, and the other end of the cabinet end control switch is electrically connected to a power input end of the corresponding drawer switch cabinet.

6. The line protection device for a motor control center cabinet of claim 5, wherein: The cabinet end control switches are low-voltage disconnectors.

7. The line protection device for a motor control center cabinet of claim 1, wherein: The voltage transformation ratios of all the bus section isolation transformers are equal.

8. The line protection device for a motor control center cabinet of claim 1, wherein: Each bus section isolation transformer is a dry-type isolation transformer. Each bus section isolation transformer is a dry-type isolation transformer.

Images