Handcart type low-voltage high-power soft start control cabinet convenient to overhaul

Abstract

The utility model relates to a handcart type low-voltage high-power soft start control cabinet convenient to overhaul, which comprises a control cabinet, a bus box, a low-voltage power switch, an operation contactor, a handcart type soft starter, a current transformer and a zero sequence current transformer, and is characterized in that the bus box is arranged above the control cabinet; an A / B / C / N low-voltage three-phase four-wire power supply is connected to the upper end of a low-voltage power switch through a copper bar lead, the lower end of the low-voltage power switch is simultaneously connected with the upper end of an operation contactor and a first group of major loop adapter connectors of the handcart type soft starter, and a second group of major loop adapter connectors of the handcart type soft starter is connected with the lower end of the operation contactor. And a motor cable joint is arranged at the lower end of the operation contactor. The handcart type soft starter is in a movable handcart type design, effectively solves the traditional mode that low-voltage high-power soft starters are fixedly installed, and is convenient to overhaul and maintain due to the adoption of a handcart movable structural design.

Description

Technical Field

[0001] The utility model relates to a low-voltage high-power soft-start control cabinet, in particular to a low-voltage high-power soft-start control cabinet which is convenient for maintenance and a handcart type. Background Art

[0002] 380V three-phase AC motors are widely used in various processing industries, but due to the excessive current at the start, it is easy to cause load impact, and at the same time cause the grid voltage to drop, and generate a large number of harmful harmonics, increasing the reactive power loss of electric energy. Therefore, soft start control is used when installing and using motors. At present, the commonly used low-voltage and high-power soft starters on the market are all fixed installation methods. The relevant equipment components and soft start device parts are tested by the equipment manufacturer for factory commissioning. After installation and fixing, they need to be disassembled for on-site maintenance. The maintenance workload is large, the operation is inconvenient, and it is also time-consuming, delaying production. Although there are also movable drawer-type low-voltage soft start control cabinets on the market, due to the limited gravity that the drawer can bear, it cannot be used when the motor power exceeds 110kW, because the drawer mechanism can only bear limited weight, the drawer is easy to deform, and the adapter components used in the drawer cannot withstand large currents, which will seriously cause burning.

[0003] Secondly, in the prior art, low-voltage motors exceeding 110kW are generally equipped with a soft start control cabinet. This soft start control cabinet, which is separate from the power switch control cabinet, brings great troubles to installation, use, maintenance, space occupation and cost expenditure. Summary of the invention

[0004] The purpose of the utility model is to solve the above-mentioned technical deficiencies and provide a convenient maintenance trolley-type low-voltage and high-power soft start control cabinet, which combines the power switch control cabinet and the soft start control cabinet into one, and can realize the integrated control of power on and off and soft starting at one time. At the same time, the soft starter trolley-type design is convenient for maintenance and repair.

[0005] The utility model includes: a control cabinet, a busbar box, a low-voltage power switch, a running contactor, a trolley-type soft starter, a current transformer, and a zero-sequence current transformer, and is characterized in that: a busbar box is provided above the control cabinet, an A / B / C / N low-voltage three-phase four-wire power supply is connected to the upper end of the low-voltage power switch through a copper bus wire, the lower end of the low-voltage power switch is simultaneously connected to the upper end of the running contactor and the first group of main circuit adapter plug-ins of the trolley-type soft starter, the second group of main circuit adapter plug-ins of the trolley-type soft starter is connected to the lower end of the running contactor, and a motor cable connection is provided at the lower end of the running contactor.

[0006] Furthermore, a current transformer is installed on the connecting copper busbar wire between the lower end of the low-voltage power switch and the upper end of the running contactor and the first group of main circuit adapter plug-ins of the trolley-type soft starter, which can effectively monitor the three-phase current during the starting and running status of the motor.

[0007] Furthermore, the motor cable behind the cabinet passes through the zero-sequence current transformer and is connected to the cable connection at the lower end of the running contactor.

[0008] Furthermore, the trolley-type soft starter is designed as a mobile trolley. The skeleton structure of the trolley-type soft starter and the partitions of each functional compartment are made of aluminum-zinc composite steel plates that are bolted together after being processed and bent by CNC machine tools. The interior is divided into an upper cabin and a lower cabin. The upper cabin is equipped with a starting contactor, a first set of secondary adapter plug-ins, and a first set of main circuit adapter plug-ins; the lower cabin is equipped with a magnetic coil conversion soft starter, a second set of secondary adapter plug-ins, and a second set of main circuit adapter plug-ins.

[0009] Furthermore, the principle of the magnetic coil conversion soft start device is: utilizing the electromagnetic induction characteristics, the magnetic coil conversion unit is used to adjust the coil turns ratio of the primary and secondary sides of the induction transformer, thereby changing the secondary output voltage of the induction transformer, so that it is adjusted from the set value to close to the primary input voltage, realizing the soft start function of the isolated voltage regulation method.

[0010] Furthermore, the magnetic coil conversion soft starter has dry-change characteristics, and the magnetic induction winding is insulated and sealed by a vacuum glue injection process, so that it cannot directly contact the air, thereby having better insulation performance, electrical performance, and moisture and oil resistance.

[0011] Furthermore, four movable rollers are provided at the bottom of the trolley-type soft starter to facilitate the soft starter to enter and exit the control cabinet.

[0012] Furthermore, the rear part of the trolley-type soft starter uses three positioning beams to fix the front and rear positions, and the top uses an upward pressure fixing plate. The fixing plate is provided with four circular holes, and the positions of the circular holes are consistent with the welding positions of the four fixing nuts on the top of the soft starter. The soft starter is connected to the fixing plate through fixing bolts.

[0013] Furthermore, the trolley-type soft starter is provided with a cooling fan at the rear, a folding push-pull handle at the front, and cooling ventilation holes at the front and rear.

[0014] Furthermore, the low-voltage power switch is closed, and the control command closes the starting contactor. At this time, the magnetic coil conversion soft starter starts to work, and the motor starts to run under the output voltage of the magnetic coil conversion soft starter. At the same time, the current and voltage signals are collected to gradually increase the effective number of turns of the inductor in the magnetic coil conversion soft starter. As the effective number of turns increases, the output voltage gradually increases until the motor terminal voltage approaches the system voltage, and a signal is sent to close the running contactor and open the starting contactor. At this time, the magnetic coil conversion soft starter stops working, and the motor starts and enters the running state.

[0015] The utility model adopts the above technical solution, effectively solves the traditional mode that low-voltage and high-power soft starters are all fixedly installed, and adopts a movable structure design of a handcart, which is convenient for the inspection and maintenance of the soft starter. In case of emergency, it can be directly replaced, saving time and effort. Secondly, the power switch and the soft starter are scientifically and rationally combined into a unified control cabinet. After connecting to the load motor, the power on and off and soft start operation control can be realized at one time, which effectively solves the inconvenience of installation, operation, maintenance and other aspects caused by the separate control cabinets in the prior art, is beneficial to energy saving, environmental protection, and reducing land occupation, as well as facilitating transportation and reducing cost expenditure, and can be widely promoted and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] Attached Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0018] Attached Figure 2 This is a main wiring diagram of Example 1 of the utility model;

[0019] Attached Figure 3 This is a rear view schematic diagram of the trolley-type soft start in Embodiment 1 of the utility model;

[0020] Attached Figure 4 This is a front view schematic diagram of a trolley-type soft starter in Embodiment 1 of the utility model;

[0021] Attached Figure 5 This is a side view schematic diagram of a trolley-type soft starter in Embodiment 1 of the utility model;

[0022] Attached Figure 6 It is a top view schematic diagram of the trolley-type soft start in Example 1 of the utility model.

[0023] In the figure: 1. control cabinet; 2. low voltage power switch; 3. running contactor; 4. current transformer; 5. trolley type soft start; 6. starting contactor; 7. magnetic coil conversion soft start device; 8. zero sequence current transformer; 9. copper busbar conductor; 10. bus box; a-upper cabin; b-lower cabin; 101-moving roller; 102-positioning beam; 103-first set of secondary adapter plug-ins; 104-first set of main circuit adapter plug-ins; 105-second set of secondary adapter plug-ins; 106-second set of main circuit adapter plug-ins; 107-fixing plate; 108-fixing bolt; 109-fixing nut; 110-heat dissipation vents; 111-heat dissipation fan; 112-folding push-pull handle; M-motor. DETAILED DESCRIPTION

[0024] like Figure 1-6 As shown: This embodiment is a trolley-type low-voltage high-power soft start control cabinet that is easy to maintain: it includes: a control cabinet (1), a busbar box (10), a low-voltage power switch (2), an operating contactor (3), a trolley-type soft starter (5), a current transformer (4), and a zero-sequence current transformer (8), characterized in that: a busbar box (10) is provided above the control cabinet (1), an A / B / C / N low-voltage three-phase four-wire power supply is connected to the upper end of the low-voltage power switch (2) through a copper busbar conductor (9), the lower end of the low-voltage power switch (2) is simultaneously connected to the upper end of the operating contactor (3) and the first group of main circuit adapter plugs (104) of the trolley-type soft starter (5), the second group of main circuit adapter plugs (106) of the trolley-type soft starter (5) is connected to the lower end of the operating contactor (3), and a motor (M) cable connection is provided at the lower end of the operating contactor (3).

[0025] In this embodiment, a current transformer (4) is installed on the connecting copper busbar conductor (9) between the lower end of the low-voltage power switch (2) and the upper end of the running contactor (3) and the first group of main circuit adapter plugs (104) of the trolley-type soft starter (5), so as to effectively monitor the three-phase current of the motor (M) when it is in the starting and running state.

[0026] In this embodiment, a zero-sequence current transformer (8) is provided at the rear bottom of the control cabinet (1), and the motor (M) cable passes through the zero-sequence current transformer (8) and is connected to the cable connection at the lower end of the running contactor (3), so that the unbalanced current when the motor (M) is running can be effectively monitored, thereby playing a grounding protection function.

[0027] In this embodiment, the trolley-type soft starter (5) is of a mobile trolley-type design. The skeleton structure of the trolley-type soft starter (5) and the partitions of each functional compartment are made of aluminum-zinc composite steel plates that are processed and bent by a CNC machine tool and then bolted together. The interior is divided into an upper compartment (a) and a lower compartment (b). The upper compartment (a) is equipped with a starting contactor (6), a first set of secondary adapter plug-ins (103), and a first set of main circuit adapter plug-ins (104); the lower compartment (b) is equipped with a magnetic coil conversion soft starter (7), a first set of secondary adapter plug-ins (105), and a second set of main circuit adapter plug-ins (106).

[0028] In this embodiment, the first set of secondary adapter plug-ins (103) and the first set of secondary adapter plug-ins (105) use RC2 type 20-hole adapter plug-ins, and the first set of main circuit adapter plug-ins (104) and the second set of main circuit adapter plug-ins (106) use JCAA-630A high current adapter plug-ins. The adapter plug-ins are male and female combined plug-ins, the male plug-in is installed on the trolley type soft starter (5), and the female plug-in is fixed in the control cabinet (1).

[0029] In this embodiment, the principle of the magnetic coil conversion soft start device (7) is to utilize the electromagnetic induction characteristics to adjust the coil turns ratio of the primary and secondary sides of the induction transformer through the magnetic coil conversion unit, thereby changing the secondary output voltage of the induction transformer, so that it is adjusted from the set value to close to the primary input voltage, thereby realizing the soft start function of the isolated voltage regulation mode.

[0030] The magnetic coil conversion soft starter (7) has dry-change characteristics, and the magnetic induction winding is insulated and sealed by a vacuum glue injection process, so that it cannot directly contact the air, thereby having better insulation performance, electrical performance, and moisture and oil resistance.

[0031] In this embodiment, the bottom of the trolley-type soft starter (5) is provided with four moving rollers (101) to facilitate the trolley-type soft starter (5) to enter and exit the control cabinet (1). The rear of the trolley-type soft starter (5) uses three positioning beams (102) to fix the front and rear positions, and the top uses an upward pressure type fixing plate (107). The fixing plate (107) is provided with four round holes, and the positions of the round holes are consistent with the welding positions of the four fixing nuts (109) on the top of the trolley-type soft starter (5). The trolley-type soft starter (5) and the fixing plate (107) are connected together by fixing bolts (108). The two ends of the fixing plate (107) are connected together with the control cabinet (1). When maintenance and repair are required, only the fixing plate (107) needs to be removed, and the trolley-type soft starter (5) can be freely moved in and out of the control cabinet (1). In an emergency, the faulty trolley-type soft starter (5) can be replaced as a whole in a short time.

[0032] In this embodiment, the trolley-type soft starter (5) is provided with a cooling fan (111) at the rear, a folding push-pull handle (112) at the front, and cooling ventilation holes (110) at the front and rear.

[0033] In specific implementation, the skeleton structure of the control cabinet (1) and the partitions of each functional compartment are made of aluminum-zinc composite steel plates that are processed and bent by CNC machine tools and then bolted together. Secondary control devices should be arranged inside. Time relays, Siemens S7-200 series PLCs, intermediate relays, small circuit breakers, temperature controllers, temperature sensors, fuse holders, etc. are used in the secondary control circuit. A control panel is arranged outside the control cabinet (1). A temperature and humidity controller, indicator lights, operation buttons, three-phase current and voltage digital display instruments, etc. are arranged on the panel. This can realize the detection, protection and control of the status of the motor (M) and the soft starter, and monitor, calculate and measure the current and voltage during operation.

[0034] In a specific implementation, the low voltage power switch (2) is closed, and the Siemens S7-200 series PLC control command closes the starting contactor (6). At this time, the magnetic coil conversion soft start device (7) starts to work, and the motor (M) starts to run under the output voltage of the magnetic coil conversion soft start device (7). At the same time, the current and voltage signals are collected to gradually increase the effective number of turns of the inductor in the magnetic coil conversion soft start device (7). As the effective number of turns increases, the output terminal voltage gradually increases until the terminal voltage of the motor (M) approaches the system voltage, and a signal is sent to close the running contactor (3) and open the starting contactor (6). At this time, the magnetic coil conversion soft start device (7) stops working, and the motor (M) starts and enters the running state.

[0035] The above are only some embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have combinations and modifications of the aforementioned technical features. Without departing from the spirit and scope of the present invention, those skilled in the art may improve, modify, or replace the present invention with equivalents, or apply the structure or method of the present invention to other fields to achieve the same effect, which all fall within the scope of protection of the present invention.

Claims

1. A convenient maintenance trolley-type low-voltage high-power soft start control cabinet, comprising: A control cabinet, a busbar box, a low-voltage power switch, a running contactor, a trolley-type soft starter, a current transformer, and a zero-sequence current transformer, characterized in that: a busbar box is provided above the control cabinet, an A / B / C / N low-voltage three-phase four-wire power supply is connected to the upper end of the low-voltage power switch through a copper busbar conductor, the lower end of the low-voltage power switch is simultaneously connected to the upper end of the running contactor and the first group of main circuit adapter plug-ins of the trolley-type soft starter, the second group of main circuit adapter plug-ins of the trolley-type soft starter is connected to the lower end of the running contactor, and a motor cable connection is provided at the lower end of the running contactor.

2. According to claim 1, a convenient maintenance trolley type low voltage high power soft start control cabinet is characterized in that: A current transformer is installed on the copper busbar connecting the lower end of the low-voltage power switch and the upper end of the running contactor and the first group of main circuit adapter plug-ins of the trolley-type soft starter, which can effectively monitor the three-phase current during the starting and running status of the motor.

3. According to claim 1, a convenient maintenance trolley type low voltage high power soft start control cabinet is characterized in that: The motor cable behind the cabinet passes through the zero-sequence current transformer and is connected to the cable connection at the lower end of the running contactor.

4. The convenient maintenance trolley-type low-voltage high-power soft start control cabinet according to claim 1 is characterized in that: The trolley-type soft starter is designed as a mobile trolley. The skeleton structure of the trolley-type soft starter and the partitions of each functional compartment are bolted together after being processed and bent by a CNC machine tool. The interior is divided into an upper cabin and a lower cabin. The upper cabin is equipped with a starting contactor, a first set of secondary adapter plug-ins, and a first set of main circuit adapter plug-ins; the lower cabin is equipped with a magnetic coil conversion soft starter, a second set of secondary adapter plug-ins, and a second set of main circuit adapter plug-ins.

5. The convenient maintenance trolley-type low-voltage high-power soft start control cabinet according to claim 4 is characterized in that: The bottom of the trolley-type soft starter is provided with four movable rollers, which facilitate the trolley-type soft starter to enter and exit the control cabinet.

6. The convenient maintenance trolley-type low-voltage high-power soft start control cabinet according to claim 4 is characterized in that: The rear part of the trolley-type soft starter adopts three positioning beams to fix the front and rear positions, and the top adopts an upward pressure fixing plate. The fixing plate is provided with four circular holes, and the positions of the circular holes are consistent with the welding positions of the four fixing nuts on the top of the trolley-type soft starter. The soft starter is connected to the fixing plate through fixing bolts.

7. The convenient maintenance trolley-type low-voltage high-power soft start control cabinet according to claim 4 is characterized in that: The trolley type soft starter is provided with a heat dissipation fan at the rear, a folding push-pull handle at the front, and heat dissipation ventilation holes at the front and the back.

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