CN108365538B - Power distribution cabinet for electric engineering machinery - Google Patents
Power distribution cabinet for electric engineering machinery Download PDFInfo
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- CN108365538B CN108365538B CN201810481002.5A CN201810481002A CN108365538B CN 108365538 B CN108365538 B CN 108365538B CN 201810481002 A CN201810481002 A CN 201810481002A CN 108365538 B CN108365538 B CN 108365538B
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- 238000002955 isolation Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 230000026676 system process Effects 0.000 claims description 6
- 239000007858 starting material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 101100190621 Arabidopsis thaliana PLC4 gene Proteins 0.000 description 8
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a power distribution cabinet for electric engineering machinery, belongs to the field of power distribution cabinets, and is used for connecting and controlling the electric engineering machinery and an external power supply. The power distribution cabinet for the electric engineering machinery comprises a cabinet body, and an electric power isolation and short-circuit protection device, a leakage protection device, a motor starting device, a motor speed regulating device, a motor protection device, an electric control system, an electric parameter acquisition display assembly and an operation alarm indicator lamp are arranged in the cabinet body. The power distribution cabinet is provided with two electric loops, can be directly externally connected with a power grid power supply to realize the operation of the electric engineering machinery under the rated power frequency, and can also be connected with an external variable-frequency power supply to realize the variable-frequency speed regulation operation of the electric engineering machinery. The power distribution cabinet is provided with a leakage protection device, a motor protection device, a short-circuit protection device and an alarm device, and can cut off a power supply in time when a fault occurs and send out an alarm signal.
Description
Technical Field
The invention relates to the field of power distribution cabinets, in particular to a power distribution cabinet for electric engineering machinery.
Background
Most engineering machinery and farm machinery in the present stage are driven by fuel engines, and the present technology has the advantages of strong maneuverability and high field-crossing property. But has the defects of high noise of the engine, serious exhaust pollution, high use cost and high maintenance cost. With the national advocacy of using clean energy and the development of mechanical related technologies, engineering mechanical equipment using electricity as a power source is gradually becoming a development trend. Electric engineering machinery such as an electric excavator has appeared in the world, and the application of the electric engineering machinery under different working conditions is limited by only one working loop on the power distribution cabinet.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and the power distribution cabinet for the electric engineering machinery can well overcome the problems, greatly promote the electric operation of the engineering machinery, is easy to realize centralized and intelligent overall management control, and can complete the operation more efficiently, safely and reliably.
The invention provides a power distribution cabinet for electric engineering machinery, which comprises a cabinet body, wherein a cabinet body door is arranged on the cabinet body, and the power distribution cabinet is characterized in that a power isolation and short-circuit protection device, a leakage protection device, a motor starting device, a motor speed regulation device, a motor protection device, an electric control system and an electric parameter acquisition and display assembly are arranged in the cabinet body, and the power isolation and short-circuit protection device, the leakage protection device, the motor starting device, the motor speed regulation device, the motor protection device and the electric parameter acquisition and display assembly are all connected with the electric control system; the power isolation and short-circuit protection device and the electric leakage protection device are connected with an input power supply of the power distribution cabinet; the motor starting device, the motor speed regulating device and the motor protection device are all connected with an external motor;
the electric power isolation and short-circuit protection device, the electric leakage protection device, the motor starting device and the motor protection device form an external power grid electric loop, the external power grid electric loop is connected with an external power grid power supply to realize smooth starting of a motor of the electric engineering machinery and operates at constant power supply frequency, and meanwhile, an electric control system processes an operation instruction in a cab of the engineering machinery and provides a constant-frequency power supply for the motor of the engineering machinery;
the electric power isolation and short-circuit protection device, the electric leakage protection device, the motor speed regulation device and the motor protection device form an external variable frequency electric loop, the external variable frequency electric loop is connected with an external variable frequency power supply, an electric control system processes a speed regulation instruction in a cab of the engineering machinery and transmits a processing result to the external variable frequency power supply so as to regulate the frequency of an output power supply of the frequency converter and regulate the running rotating speed of the motor.
The power isolation and short-circuit protection device is composed of a circuit breaker and a fuse, wherein the circuit breaker and the fuse are connected with an input power supply of the power distribution cabinet and are used for cutting off the input power supply of the power distribution cabinet when short circuit, overvoltage or undervoltage occurs in an internal circuit of the power distribution cabinet.
The leakage protection device is composed of a zero sequence current transformer and a signal generator and is used for cutting off the input power supply of the power distribution cabinet when the grounding or leakage phenomenon occurs in the internal circuit of the power distribution cabinet.
The motor starting device is composed of a soft starter, and can start the motor smoothly without impact in the motor starting process.
The motor speed regulating device consists of a PLC and a current converter, the PLC is connected with the current converter, when an external speed regulating signal is received by the power distribution cabinet, the signal is processed through the speed regulating device and sent to external frequency conversion equipment, and the frequency of the output power supply of the frequency conversion equipment is regulated, so that the speed regulation of the motor is realized.
The motor protection device is composed of a thermal relay, the thermal relay is connected with an external motor, and when the motor is overloaded, the output power supply of the power distribution cabinet is cut off.
The electric control system is composed of a PLC, an air switch, an alternating current contactor, a power supply module and an intermediate relay, wherein the air switch, the alternating current contactor and the intermediate relay are all connected with the PLC, and the power supply module is connected with the PLC for supplying power and is used for processing electric signals and sending control signals.
The electric parameter acquisition display assembly is composed of a touch screen and is used for displaying electric parameters of voltage, current and power and fault information, an operation and alarm indicator lamp is installed at the top of the power distribution cabinet, and the operation and alarm indicator lamp is connected with an electric control system.
The cabinet body has still set up the air outlet, is provided with the air exhauster on the air outlet.
The invention has the following beneficial effects:
the invention sets the external power grid electric loop and the external variable frequency electric loop, so that the power distribution cabinet is provided with double loops, one loop of the power distribution cabinet can be selectively opened according to different requirements of external working conditions, thereby better meeting the construction requirements, greatly promoting the electrodynamic performance of engineering machinery, easily realizing centralized and intelligent overall management control, and more efficiently, safely and reliably completing the operation.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic diagram of a power distribution cabinet structure of the invention;
fig. 2 is a schematic view of the outer structure of the power distribution cabinet of the invention.
In the figure: 1-thermal relay, 2-circuit breaker, 3-soft starter, 4-PLC, 5-zero sequence current transformer, 6-air switch, 7-alternating current contactor, 8-power module, 9-pilot lamp, 10-current converter, 11-signal generator, 12-intermediate relay, 13-fuse, 14-touch-sensitive screen.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.
A power distribution cabinet for an electric engineering machine is used for equipment for connecting the electric engineering machine with an external power supply and controlling a motor. As shown in fig. 1-2, the cabinet comprises a cabinet body, wherein a cabinet door is arranged on the cabinet body, and the cabinet door is movably connected with the cabinet body. The cabinet body is internally provided with an electric power isolation and short-circuit protection device, a leakage protection device, a motor starting device, a motor speed regulation device, a motor protection device, an electric control system and an electric parameter acquisition and display assembly. The electric power isolation and short-circuit protection device, the electric leakage protection device, the motor starting device and the motor protection device form an external power grid electric loop, the external power grid electric loop is connected with an external power grid power supply to realize smooth starting of a motor of the electric engineering machinery and operates under constant power supply frequency, and meanwhile, the electric control system processes an operation instruction in a cab of the engineering machinery and provides a constant-frequency power supply for the motor of the engineering machinery. The electric power isolation and short-circuit protection device, the electric leakage protection device, the motor speed regulation device and the motor protection device form an external variable frequency electric loop, the external variable frequency electric loop is connected with an external variable frequency power supply, an electric control system processes a speed regulation instruction in a cab of the engineering machinery and transmits a processing result to the external variable frequency power supply so as to regulate the output power supply frequency of the frequency converter and regulate the running rotating speed of the motor. The electric engineering machinery opens one loop according to different construction requirements, so that the requirement of mechanical work can be well met. The two electric loops are arranged, so that the electric engineering machinery can be directly connected with an external power grid power supply to operate at the rated power frequency, and can be connected with an external variable-frequency power supply to realize variable-frequency speed regulation operation of the electric engineering machinery.
In general, an electric engineering machine often places a frequency converter on an electric device, and provides standard electric power from an external power grid, but because the working environment of the engineering machine is very bad, the frequency converter is difficult to meet the requirement of the working environment, so that the electric engineering machine with high performance is very difficult in practice. This patent is provided with electric interface and the communication interface of butt joint converter on the switch board, and when electric engineering machinery had the speed governing demand, can directly external inverter device, realizes the speed regulation of motor.
Generally, the electric engineering machinery only has one electric loop, adopts variable frequency control or directly externally connected power grid work, and the electric engineering machinery is greatly limited by the power supply of a working site, so the electric engineering machinery is provided with two electric loops, can be switched by itself according to the power supply of the site, and has wider application range.
The electric power isolation and short-circuit protection device, the electric leakage protection device, the motor starting device, the motor speed regulation device, the motor protection device and the electric parameter acquisition and display assembly are all connected with the electric control system. The power isolation and short-circuit protection device is composed of a circuit breaker and a fuse. The circuit breaker and the fuse are both connected with an input power supply of the power distribution cabinet and are used for cutting off the input power supply of the power distribution cabinet when short circuit, overvoltage or undervoltage occurs in an internal circuit of the power distribution cabinet. The electric power isolation and short-circuit protection device and the electric leakage protection device are connected with an input power supply of the power distribution cabinet. The motor starting device, the motor speed regulating device and the motor protection device are all connected with an external motor.
The power isolation and short-circuit protection device is composed of a breaker 2 and a fuse 13, wherein the breaker 2 and the fuse 13 are connected with an input power supply of the power distribution cabinet, and are used for cutting off the input power supply of the power distribution cabinet when short circuit, overvoltage or undervoltage occurs in an internal circuit of the power distribution cabinet. The leakage protection device is composed of a zero sequence current transformer 5 and a signal generator 11 and is used for cutting off the input power supply of the power distribution cabinet when the grounding or leakage phenomenon occurs in the internal circuit of the power distribution cabinet. The motor starting device is composed of a soft starter 3, and the motor is started smoothly without impact in the motor starting process. The motor speed regulating device is composed of a PLC4 and a current converter 10, the PLC4 is connected with the current converter 10, when an external speed regulating signal is received by the power distribution cabinet, the signal is processed through the speed regulating device and sent to external frequency conversion equipment, and the frequency of the output power supply of the frequency conversion equipment is regulated, so that the speed regulation of the motor is realized. The motor speed regulating device and the electric control system share one PLC4 or two PLCs 4 are arranged, and the motor speed regulating device and the electric control system are arranged according to the needs, but the motor speed regulating device and the electric control system can be generally arranged by using one PLC4, so that the cost is saved. The motor protection device is composed of a thermal relay 1, the thermal relay 1 is connected with an external motor, and when the motor is overloaded, the output power supply of the power distribution cabinet is cut off. The electric control system is composed of a PLC4, an air switch 6, an alternating current contactor 7, a power supply module 8 and an intermediate relay 12, wherein the air switch 6, the alternating current contactor 7 and the intermediate relay 12 are all connected with the PLC4, and the power supply module 8 is connected with the PLC4 for supplying power for electric signal processing and sending control signals. The electric parameter acquisition display assembly is composed of a touch screen 14 and is used for displaying electric parameters of voltage, current and power and fault information, an operation and alarm indicator lamp 9 is installed at the top of the power distribution cabinet, and the operation and alarm indicator lamp 9 is connected with an electric control system. The cabinet body is also provided with an air outlet, an exhaust fan is arranged on the air outlet, and the touch screen 14 is arranged at the front end of the cabinet body door.
As shown in fig. 1, the indicator lamp 9 is provided at the top end of the cabinet, and the current transformer 10, the intermediate relay 12 and the fuse 13 are provided in this order from top to bottom on one side surface inside the cabinet. The power module 8, the signal generator 11 parallel arrangement are on the inside trailing flank of cabinet, and air switch 6, PLC4 and soft starter 3 all set up the low side at power module 8 and signal generator 11 in proper order. The alternating-current contactor 7, the zero-sequence current transformer 5, the circuit breaker 2 and the thermal relay 1 are sequentially arranged on one side of the power supply module 8 from top to bottom.
The electrical parameter collecting assembly is integrated with multiple paths of electrical parameter collectors so as to meet the requirements of measurement of various electrical parameters and fault analysis and diagnosis, and further meet the requirements that the touch screen 14 displays high-precision electrical parameters such as voltage, current and the like, and various fault information such as motor overload, ground protection and the like. The touch screen can intuitively display the user interface through the multi-window configuration, so that a user can conveniently read information displayed on the touch screen, and parameters of the power distribution cabinet can be set through the touch screen.
The existing power distribution cabinet for the electric engineering machinery is generally only provided with an external power grid electric loop, so that frequency change control cannot be performed under any working condition of a motor, and output electric energy and the like are high, but the external power grid electric loop and the external variable frequency electric loop are arranged for the invention, the external power grid electric loop is selected under the general working condition, and when the electric motor mechanical equipment needs to output higher power or works in a heavy engineering period, the external variable frequency electric loop is started, so that frequency conversion is performed according to different working requirements, and the working efficiency is higher and better regulation and control are achieved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The power distribution cabinet for the electric engineering machinery comprises a cabinet body, wherein a cabinet door is arranged on the cabinet body, and the power distribution cabinet is characterized in that an electric power isolation and short-circuit protection device, an electric leakage protection device, a motor starting device, a motor speed regulation device, a motor protection device, an electric control system and an electric parameter acquisition and display assembly are arranged in the cabinet body, and the electric power isolation and short-circuit protection device, the electric leakage protection device, the motor starting device, the motor speed regulation device, the motor protection device and the electric parameter acquisition and display assembly are all connected with the electric control system; the power isolation and short-circuit protection device and the electric leakage protection device are connected with an input power supply of the power distribution cabinet; the power isolation and short-circuit protection device consists of a circuit breaker (2) and a fuse (13), wherein the circuit breaker (2) and the fuse (13) are connected with an input power supply of the power distribution cabinet, and are used for cutting off the input power supply of the power distribution cabinet when short circuit, overvoltage or undervoltage occurs in an internal circuit of the power distribution cabinet; the leakage protection device consists of a zero sequence current transformer (5) and a signal generator (11) and is used for cutting off an input power supply of the power distribution cabinet when the grounding or leakage phenomenon occurs in an internal circuit of the power distribution cabinet;
the motor starting device, the motor speed regulating device and the motor protection device are all connected with an external motor; the motor starting device consists of a soft starter (3) and is used for starting the motor without impact and smoothness in the process of starting the motor; the motor speed regulating device consists of a PLC (4) and a current converter (10), wherein the PLC (4) is connected with the current converter (10), and when an external speed regulating signal is received by the power distribution cabinet, the signal is processed through the speed regulating device and sent to external frequency conversion equipment, and the frequency of an output power supply of the frequency conversion equipment is regulated, so that the speed regulation of the motor is realized; the motor protection device is composed of a thermal relay (1), the thermal relay (1) is connected with an external motor, and when the motor is overloaded, the output power supply of the power distribution cabinet is cut off;
the electric control system consists of a PLC (4), an air switch (6), an alternating current contactor (7), a power module (8) and an intermediate relay (12), wherein the air switch (6), the alternating current contactor (7) and the intermediate relay (12) are connected with the PLC (4), and the power module (8) is connected with the PLC (4) for supplying power and is used for processing electric signals and sending control signals;
the electric parameter acquisition display assembly is composed of a touch screen (14) and is used for displaying electric parameters of voltage, current and power and fault information, an operation and alarm indicator lamp (9) is arranged at the top of the power distribution cabinet, and the operation and alarm indicator lamp (9) is connected with an electric control system;
the electric power isolation and short-circuit protection device, the electric leakage protection device, the motor starting device and the motor protection device form an external power grid electric loop, the external power grid electric loop is connected with an external power grid power supply to realize smooth starting of a motor of the electric engineering machinery and operates at constant power supply frequency, and meanwhile, an electric control system processes an operation instruction in a cab of the engineering machinery and provides a constant-frequency power supply for the motor of the engineering machinery;
the electric power isolation and short-circuit protection device, the electric leakage protection device, the motor speed regulation device and the motor protection device form an external variable frequency electric loop, the external variable frequency electric loop is connected with an external variable frequency power supply, an electric control system processes a speed regulation instruction in a cab of the engineering machinery and transmits a processing result to the external variable frequency power supply so as to regulate the frequency of an output power supply of the frequency converter and regulate the running rotating speed of the motor.
2. The power distribution cabinet for electric engineering machinery according to claim 1, wherein the cabinet body is further provided with an air outlet, and an exhaust fan is arranged on the air outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810481002.5A CN108365538B (en) | 2018-05-18 | 2018-05-18 | Power distribution cabinet for electric engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810481002.5A CN108365538B (en) | 2018-05-18 | 2018-05-18 | Power distribution cabinet for electric engineering machinery |
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| Publication Number | Publication Date |
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| CN108365538A CN108365538A (en) | 2018-08-03 |
| CN108365538B true CN108365538B (en) | 2024-03-12 |
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| CN201810481002.5A Active CN108365538B (en) | 2018-05-18 | 2018-05-18 | Power distribution cabinet for electric engineering machinery |
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| JP2007209151A (en) * | 2006-02-03 | 2007-08-16 | Hitachi Ltd | Loop operational system in electrical distribution system and method |
| WO2009124338A1 (en) * | 2008-04-07 | 2009-10-15 | Protectelec Pty Ltd | An electrical protection device and an electrical distribution system including an electrical protection device |
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| CN108365538A (en) | 2018-08-03 |
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