Switch cabinet with microcomputer motor protection monitoring device

Abstract

According to the switch cabinet with the microcomputer motor protecting and monitoring device, the microcomputer motor protecting and monitoring device is integrated, a secondary element and a primary loop are mutually independent, and the switch cabinet is beneficial to simplifying control connecting wires, reducing design and operation and maintenance difficulty, improving production and maintenance efficiency and improving the safe operation level of an electric power system.

Description

Technical Field

[0001] The invention relates to the field of low-voltage switch cabinets, in particular to a low-voltage switch cabinet with a microcomputer motor protection monitoring device. Background Art

[0002] Low-voltage switchgear is an electrical device used for power transmission, distribution and energy conversion, and is suitable for power plants, petroleum, chemical, metallurgy, textile, high-rise buildings and other industries. The primary main equipment, secondary control equipment and protection monitoring devices of existing low-voltage switchgear are cross-connected with each other, and the number of wiring is large, which increases the complexity of design and operation and maintenance, reduces production and maintenance efficiency, and makes it impossible to improve the safe operation level of the power system.

[0003] Therefore, the applicant has found a solution to the above-mentioned problem through beneficial exploration and research, and the technical solution to be introduced below is produced in this context. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a switch cabinet with a microcomputer motor protection and monitoring device, which integrates the microcomputer motor protection and monitoring device. The secondary elements and the primary circuit are independent of each other, which is conducive to streamlining control connections, reducing design and operation and maintenance difficulties, improving production and maintenance efficiency, and improving the safe operation level of the power system.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a switch cabinet with a microcomputer motor protection monitoring device, including a primary circuit, a current and voltage transformer module, a state detection output control module, a microcomputer motor protection monitoring device, a secondary element and a human-machine interface module, wherein the primary circuit includes a primary incoming line, a circuit breaker, a contactor, and a primary outgoing line, and is the main circuit of the switch cabinet; the current and voltage transformer module includes a three-phase voltage transformer, a three-phase current transformer, and a leakage transformer, and can isolate and transform the primary current and voltage into a secondary weak signal to send to the microcomputer motor protection monitoring device; the state detection output control module includes a state detection module and an output control module, and can isolate and detect the operating state of the primary circuit equipment, and isolate and drive The microcomputer motor protection monitoring device is the core of the switch cabinet protection monitoring, which can calculate the electrical parameter values ​​of the primary circuit, detect the status of the primary circuit, and realize the protection and control functions of the primary circuit through logical operations. It can also receive the operation of the secondary element operation button, execute the corresponding control function, and transmit the necessary data and status to the indicator light and human-machine interface of the secondary element; the secondary element includes an operation button and a status indicator light, which can send the operation button status to the microcomputer motor protection monitoring device and output the required indicator light status; the human-machine interface module includes a display and a communication interface, the display has display and operation functions, and the communication interface provides communication connections for various needs.

[0006] Furthermore, the microcomputer motor protection monitoring device has thermal overload, starting overcurrent, stall, starting timeout, starting number limit, single-phase grounding, tE time, phase loss, current imbalance, external fault, undercurrent, reverse phase sequence, contactor breaking capacity, contactor fault, quick break, leakage, undervoltage, overvoltage and underpower protection functions, and has network remote control, direct starting, panel control, instrument automatic control, standby machine automatic starting, opening positioning control, immediate restart (anti-electric shaking), delayed restart, dual speed control, forward and reverse control, pre-start control, auto-coupling step-down starting, Y-△ starting, resistance step-down starting and soft start switching control functions.

[0007] Compared with the existing technology, the beneficial effects of the present invention are: providing a switch cabinet with a microcomputer motor protection and monitoring device, integrating the microcomputer motor protection and monitoring device, and the secondary elements and the primary circuit are independent of each other, which is conducive to streamlining control connections, reducing design and operation and maintenance difficulties, improving production and maintenance efficiency, and improving the safe operation level of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 It is a principle block diagram of the present invention. DETAILED DESCRIPTION

[0010] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with the specific illustrations in the embodiments.

[0011] like Figure 1 The switch cabinet with a microcomputer motor protection monitoring device shown in the figure includes a primary circuit, a current and voltage transformer module, a state detection output control module, a microcomputer motor protection monitoring device, a secondary element and a human-machine interface module. The primary current and voltage of the primary circuit operation are isolated and converted into a secondary weak signal through the current and voltage transformer module and sent to the microcomputer motor protection monitoring device; the state of the primary element of the primary circuit is isolated and detected through the state detection output control module and sent to the microcomputer motor protection monitoring device; the operation state of the operation button of the secondary element is sent to the microcomputer motor protection monitoring device; the operation status of the display of the human-machine interface module and the communication interface telemetering and telemetry command are sent to the microcomputer motor protection monitoring device; the microcomputer motor protection monitoring device performs protection operations and logical judgments on the current and voltage, the operation status, the operation button command, the display operation command and the telemetering and telemetry command, determines the corresponding execution action, isolates and controls the primary element of the primary circuit through the state detection output control module, indicates the current system operation status through the indicator light of the secondary element, and displays and uploads the electrical parameter data and operation status of the system through the human-machine interface module.

[0012] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A switch cabinet with a microcomputer motor protection and monitoring device, characterized in that: It includes a primary circuit, a current and voltage transformer module, a state detection output control module, a microcomputer motor protection monitoring device, a secondary element and a human-machine interface module. The primary circuit includes a primary incoming line, a circuit breaker, a contactor, and a primary outgoing line, which is the main circuit of the switch cabinet; the current and voltage transformer module includes a three-phase voltage transformer, a three-phase current transformer, and a leakage transformer, which can isolate and transform the primary current and voltage into a secondary weak signal to send to the microcomputer motor protection monitoring device; the state detection output control module includes a state detection module and an output control module, which can isolate and detect the operating state of the primary circuit equipment, and isolate and drive all the execution actions of the primary equipment; The microcomputer motor protection monitoring device is the core of the switch cabinet protection monitoring. It can calculate the electrical parameter values ​​of the primary circuit, detect the status of the primary circuit, and realize the protection and control of the primary circuit through logical operations. It can also receive the operation of the secondary element operation button, execute corresponding control, and transmit the necessary data and status to the indicator light and human-machine interface of the secondary element; the secondary element includes an operation button and a status indicator light, which can send the operation button status to the microcomputer motor protection monitoring device and output the required indicator light status; the human-machine interface module includes a display and a communication interface, the display has display and operation functions, and the communication interface provides communication connections for various needs.

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