Digital control method of electric handcart and device thereof

Abstract

The invention relates to electric control of a handcart in an electrical switch cabinet, in particular to a digital control method of an electric handcart and a device thereof. The invention controls and judges the position and the work state of the handcart to monitor the output power and the electric current of a motor of an electrically operated mechanism in real time. When the motor normally works, the invention does not start up protection; if abnormal situations such as clamping stagnation, stopping-up rotation, and the like happens, the invention increases the output electric current of the motor, controls the motor to be braked in real time, cuts off the electrical source of the motor, controls the motor to reversely rotate, smoothly unlocks clutches and protects the whole mechanism.

Description

technical field [0001] The invention relates to electric control of handcarts in electric switch cabinets, in particular to a digital control method and device for electric handcarts. Background technique [0002] According to the electrical "five defenses" of switchgear design and the safety requirements of equipment use, there are many mechanical interlocks designed in the circuit breaker handcart itself and in cooperation with the switch cabinet, which are restricted to swing in or out of the circuit breaker handcart when the conditions are not met. For example, when the handcart is pushed into the switch cabinet, before it reaches the test position, the mechanical interlock that does not allow the handcart to swing in; the circuit breaker is in the closed state, and the mechanical interlock that prohibits shaking into the working position; The mechanical interlock that does not allow the handcart to swing into the working position when the brake is not opened. During th...

AI Technical Summary

Problems solved by technology

[0007] 1. Circuit breakers of different specifications have different weights;

[0008] 2. The quality of coordination between handcarts of circuit breakers of different specifications and switch cabinet guide rails and dynamic and static contacts will also affect the resistance when entering and exiting;

[0009] 3. Especially the resistance between the moving contact of the circuit breaker and the static contact inserted into the cabinet will increase a lot, there is a process of sudden loading

[0012] If the handcart encounters obstacles or jams during the electric entry and exit process, and the polarity of the power supply is reversed at the working or test position, it will cause the motor to burn out, the mechanism to be damaged or the transmission to fail, so that the chassis will be damaged, and the circuit breaker will also be stuck. Serious consequences of dying in the switch cabinet; after an abnormal stall, the mechanism is damaged, the clutch cannot be unlocked, and manual switching cannot be achieved

[0013] During the installation and maintenance process, it is difficult for the user to avoid misuse or failure to check whether the various interlocks are reset. Cause the transmission failure or damage of the whole mechanism (at this time, the clutch function fails), and also cause the circuit breaker to be stuck in the switch cabinet, unable to enter and exit. At the same time, troubleshooting and restoring the function will not only cost costs but also take a long time. And the installation work has a serious impact, causing strong complaints and dissatisfaction from users

Images