Electrical component arrangement and wiring structure of a three-phase power control cabinet

Abstract

An electrical component arrangement and wiring structure of a three-phase power control cabinet, characterized in that: a first contactor (KM1) and a third contactor (KM3) are arranged in a row in a transverse direction to form a middle row, and a second contactor (KM2) is arranged above the first contactor (KM1) and the third contactor (KM3); a first perforated structure (111) is formed below the thermal relay (FR) on a mounting plate (11), and a second perforated structure (112) is formed above the first contactor (KM1) and the third contactor (KM3) below the second contactor (KM2) on the mounting plate; a power line at the output end below the thermal relay (FR) passes through the first perforated structure (111) to the back of the mounting plate (11), and is wired from the back to the second perforated structure (112), and then passes through three through holes of the second perforated structure (112) to the front of the mounting plate (11).

Description

Technical Field

[0001] This utility model relates to an electrical control cabinet, specifically to a three-phase power control cabinet with an electrical component layout and wiring structure. Background Technology

[0002] A standard 380V star-delta step-down start control circuit, such as Figure 1 As shown, it includes a circuit breaker QF, a first contactor KM1, a second contactor KM2, a third contactor KM3, and a thermal relay FR. Star or delta starting can be achieved by switching the second contactor KM2 and the third contactor KM3.

[0003] When such circuits are installed inside the power control cabinet, since the power control cabinet uses a front-opening door, there is a mounting plate on the inner wall of the cabinet. All electrical components are mounted on the front of the mounting plate, and all three-phase power lines are also connected to the front of the mounting plate. In particular, the three contactors KM1, KM2, and KM3 are usually arranged in a horizontal row. Because the power lines need to carry a considerable current, the wire diameter is often relatively large and the wires are relatively thick. Sufficient bending distance needs to be left, which wastes space inside the cabinet and results in a large external size of the cabinet. Summary of the Invention

[0004] The purpose of this utility model is to provide an electrical component layout and wiring structure for a three-phase power control cabinet, thereby improving the rationality of the electrical component layout and wiring, saving space in the power control cabinet, and reducing the overall size of the cabinet.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an electrical component layout and wiring structure for a three-phase power control cabinet, wherein the three-phase power control cabinet includes a cabinet with an internal mounting plate and a star-delta reduced voltage starting control circuit disposed within the cabinet; the star-delta reduced voltage starting control circuit includes a circuit breaker, a first contactor, a second contactor, a third contactor, and a thermal relay fixedly mounted on the front of the mounting plate; the first contactor serves as the main contactor, the second contactor serves as the star contactor, and the third contactor serves as the delta contactor;

[0006] The first contactor and the third contactor are arranged in a horizontal row to form a middle row, while the second contactor is located above the first contactor and the third contactor, and the thermal relay is located below the first contactor and the third contactor.

[0007] The mounting plate has a first through-hole structure below the thermal relay. The upper ends of the main contacts of the second contactor are short-circuited together. The mounting plate has a second through-hole structure below the second contactor and above the first and third contactors. The power line of the lower output terminal of the thermal relay passes through the first through-hole structure to the back of the mounting plate, runs from the back to the second through-hole structure, and returns to the front of the mounting plate through the three through holes of the second through-hole structure, connecting to the lower end of the main contacts of the second contactor.

[0008] In the above scheme, the first perforated structure includes three through holes, which are connected by a connecting slot. The three through holes correspond to the three power lines of the three phases, with one power line passing through each through hole. Considering that the three-phase power lines are alternating current and carry a large current when the power control cabinet is working, electromagnetic induction and alternating magnetic fields are easily generated on the surface of the three independent circular holes on the mounting plate, which increases the resistance and generates heat. This not only increases the energy consumption of the equipment but also accelerates the aging of the equipment. Therefore, a slot is made between two adjacent circular holes, so that the three circular holes are connected together to form a single hole to avoid local overheating.

[0009] Furthermore, each of the three through holes in the first perforated structure is fitted with a cable connector, through which the power cord passes to the back of the mounting plate. The nut on the cable connector can be used to lock the power cord in place, preventing the power cord from rubbing against the mounting plate and cabinet in a free state, which could damage the power cord insulation and cause a short circuit.

[0010] In the above scheme, the second perforated structure includes three through holes, which are also connected by a connecting slot. The three through holes correspond to the three power lines of the three phases, with one power line passing through each through hole. Considering that the three-phase power lines are alternating current and carry a large current when the power control cabinet is working, electromagnetic induction and alternating magnetic fields are easily generated on the surface of the three independent circular holes on the mounting plate, which increases the resistance and generates heat. This not only increases the energy consumption of the equipment but also accelerates the aging of the equipment. Therefore, a slot is made between two adjacent circular holes, so that the three circular holes are connected together to form a single hole to avoid local overheating.

[0011] Furthermore, each of the three through holes in the second perforated structure is fitted with a cable connector, through which the power cord returns to the front of the mounting plate. The nut on the cable connector can be used to lock the power cord in place, preventing the power cord from rubbing against the mounting plate and cabinet in a free state, thus avoiding the risk of damage to the power cord insulation and short circuits.

[0012] In the above scheme, the circuit breaker is arranged in the same row as the first contactor and the third contactor, and the upper end of the circuit breaker is connected to the upper end of the first contactor and the third contactor by a copper busbar.

[0013] The advantages and effects of this utility model are:

[0014] This utility model arranges the second contactor in two rows with the first and third contactors, and uses the first and second perforation structures to allow some power lines to run on the back of the mounting plate, making the power line routing more reasonable and making full use of the space on the back of the mounting plate, resulting in a more compact arrangement of components and reducing the overall size of the cabinet. Attached Figure Description

[0015] Figure 1 This is an embodiment of the present invention and a standard existing 380V star-delta step-down start control circuit;

[0016] Figure 2 This is a schematic diagram of the electrical component layout and wiring structure according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the first perforated structure 111 or the second perforated structure 112 of this utility model embodiment.

[0018] In the above attached diagrams: 1. Cabinet; 11. Mounting plate; 111. First perforated structure; K1. Through hole; K2. Through hole; K3. Through hole; 111a. Connecting slot; 112. Second perforated structure; 112a. Connecting slot; K4. Through hole; K5. Through hole; K6. Through hole; 112a. Connecting slot; QF. Circuit breaker; KM1. First contactor; KM2. Second contactor; KM3. Third contactor; M1. Motor; FR. Thermal relay. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Example: See Figure 1 and Figure 2 As shown, this is a wiring structure for electrical components in a three-phase power control cabinet:

[0021] See Figure 2 As shown, the three-phase power control cabinet includes a cabinet body 1 with an internal mounting plate 11, a cabinet door (not shown in the figure), and a star-delta reduced voltage start control circuit located inside the cabinet body 11.

[0022] The star-delta buck start control circuit, such as Figure 1As shown, the device includes a circuit breaker QF, a first contactor KM1, a second contactor KM2, a third contactor KM3, and a thermal relay FR, all fixedly mounted on the front of the mounting plate 11. The first contactor KM1 serves as the main contactor, with one end of its main contact connected to the output terminal of the circuit breaker QF, and the other end connected to the starting terminals U1, V1, and W1 of the motor M1. The second contactor KM2 serves as a star contactor, with one end of its main contacts short-circuited together, and the other end connected to the output terminal of the thermal relay FR. The third contactor KM3 serves as a delta contactor, with one end of its main contact connected to the output terminal of the circuit breaker QF, and the other end connected to the input terminal of the thermal relay FR. The output terminal of the thermal relay FR is also connected to the ending terminals U2, V2, and W2 of the motor M1.

[0023] The specific layout and wiring structure of electrical components are as follows:

[0024] See Figure 2 The first contactor KM1 and the third contactor KM3 are arranged in a horizontal row to form a middle row, while the second contactor KM2 is located above the first contactor KM1 and the third contactor KM3, and the thermal relay FR is located below the first contactor KM1 and the third contactor KM3.

[0025] See Figure 2 The mounting plate 11 has a first through-hole structure 111 below the thermal relay FR. The upper ends of the main contacts of the second contactor KM2 are shorted together by copper busbars. A second through-hole structure 112 is also provided on the mounting plate below the second contactor KM2 and above the first contactor KM1 and the third contactor KM3. The first through-hole structure 111 includes three through holes K1, K2, and K3, and the second through-hole structure 112 also includes three through holes K4, K5, and K6.

[0026] See Figure 1 and Figure 2 The power supply line of the lower output terminal of the thermal relay FR passes through the three through holes K1, K2, and K3 of the first through-hole structure 111 to the back of the mounting plate 11, runs from the back to the second through-hole structure 112, and returns to the front of the mounting plate 11 via the three through holes K4, K5, and K6 of the second through-hole structure 112, connecting to the lower end of the main contact of the second contactor KM2. Figure 1 In this configuration, the power lines between the through holes K1, K2, K3 and K4, K5, K6 are routed on the back of the mounting plate 11.

[0027] The circuit breaker QF is arranged in the same row as the first contactor KM1 and the third contactor KM3. The upper end of the circuit breaker QF is connected in parallel with the upper ends of the first contactor KM1 and the third contactor KM3 via copper busbars. The circuit breaker QF is supplied with three-phase power, while the lower end of the first contactor KM1 is supplied with motor M1.

[0028] The first perforation structure 111 and the second perforation structure 112 can be elongated slots or three through holes opened on the mounting plate 11, so that the three-phase power lines can pass from the front to the back of the mounting plate 141, or from the back to the front.

[0029] Specifically, such as Figure 3 As shown, the first perforated structure 111 includes three through holes K1, K2, and K3, which are connected by a connecting groove 111a. The second perforated structure 112 also includes three through holes K4, K5, and K6, which are also connected by a connecting groove 112a. This design uses three independent circular holes to position the three-phase power lines. The connecting groove is designed to accommodate the alternating current (AC) lines carrying a large current when the power control cabinet is operating. Passing through the three independent circular holes on the mounting plate can easily generate electromagnetic induction and alternating magnetic fields on the surface, increasing resistance and causing heat generation. This not only increases energy consumption but also accelerates equipment aging. Therefore, a groove is created between two adjacent circular holes, connecting the three holes into a single hole to prevent localized overheating.

[0030] Furthermore, a cable connector is embedded in each of the three through holes K1, K2, and K3 of the first perforated structure 111, through which the power cable passes to the back of the mounting plate 11. Similarly, a cable connector is embedded in each of the three through holes K4, K5, and K6 of the second perforated structure 112, through which the power cable returns to the front of the mounting plate 11. The nut on the cable connector secures the wire, preventing damage to the wire insulation and the risk of short circuits caused by friction between the wire and the mounting plate and cabinet when the wire is in a free state.

[0031] In this embodiment, the second contactor KM2 is arranged in two rows with the first contactor KM1 and the third contactor KM3. The first through-hole structure 111 and the second through-hole structure 112 allow some of the power lines to run on the back of the mounting plate 11, making the power line routing more reasonable and making full use of the space on the back of the mounting plate 11. This makes the arrangement of components more compact and reduces the overall size of the cabinet 1.

[0032] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electrical component layout and wiring structure for a three-phase power control cabinet, the three-phase power control cabinet comprising a cabinet (1) with an internal mounting plate (11) and a star-delta reduced voltage starting control circuit disposed within the cabinet (1); the star-delta reduced voltage starting control circuit comprising a circuit breaker (QF), a first contactor (KM1), a second contactor (KM2), a third contactor (KM3), and a thermal relay (FR) fixedly mounted on the front of the mounting plate (11); the first contactor (KM1) serving as the main contactor, the second contactor (KM2) serving as the star contactor, and the third contactor (KM3) serving as the delta contactor; characterized in that: The first contactor (KM1) and the third contactor (KM3) are arranged in a horizontal row to form a middle row, while the second contactor (KM2) is located above the first contactor (KM1) and the third contactor (KM3), and the thermal relay (FR) is located below the first contactor (KM1) and the third contactor (KM3). The mounting plate (11) has a first through-hole structure (111) below the thermal relay (FR), the upper ends of the main contacts of the second contactor (KM2) are short-circuited together, and the mounting plate has a second through-hole structure (112) above the first contactor (KM1) and the third contactor (KM3) below the second contactor (KM2); the power line of the lower output terminal of the thermal relay (FR) passes through the first through-hole structure (111) to the back of the mounting plate (11), runs from the back to the second through-hole structure (112), and returns to the front of the mounting plate (11) through the three through holes of the second through-hole structure (112), and connects to the lower end of the main contacts of the second contactor (KM2).

2. The electrical component layout and wiring structure of the three-phase power control cabinet according to claim 1, characterized in that: The first perforated structure (111) includes three through holes (K1, K2, K3), which are connected by a through groove (111a).

3. The electrical component layout and wiring structure of the three-phase power control cabinet according to claim 1 or 2, characterized in that: A cable connector is embedded in each of the three through holes (K1, K2, K3) of the first perforated structure (111), and the power line passes through the cable connector of the first perforated structure (111) to the back of the mounting plate (11).

4. The electrical component layout and wiring structure of the three-phase power control cabinet according to claim 1 or 2, characterized in that: The second perforated structure (112) includes three through holes (K4, K5, K6), which are also connected by a through groove (112a).

5. The electrical component layout and wiring structure of the three-phase power control cabinet according to claim 4, characterized in that: The second perforated structure (112) has three through holes (K4, K5, K6) each with a cable connector embedded in them. The power cord returns to the front of the mounting plate (11) through the cable connector of the second perforated structure (112).

6. The electrical component layout and wiring structure of the three-phase power control cabinet according to claim 1, characterized in that: The circuit breaker (QF) is arranged in the same row as the first contactor (KM1) and the third contactor (KM3), and the upper end of the circuit breaker (QF) is connected in parallel with the upper ends of the first contactor (KM1) and the third contactor (KM3) via copper busbars.

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