Distributed insulation resistance monitoring system

Abstract

The invention relates to the technical field of insulation monitoring, in particular to a distributed insulation resistance monitoring system. The system comprises a main monitoring system and a plurality of remote monitoring subsystems, wherein the main monitoring system comprises a control board, and a resistance measurer and a display screen that are connected with the control board; the control board comprises an MCU (micro controller unit), and a power supply circuit, a channel switching circuit, a static insulation switching circuit and an alarm output circuit that are controlled by theMCU; the remote monitoring subsystems comprise control boards and resistance measurers connected with the control boards; and the remote monitoring subsystems are connected with the main monitoring system via a CAN (controller area network) bus. The monitoring system is a device capable of achieving real-time insulation monitoring, electrostatic monitoring, electrostatic discharge; and with the adoption of a low-voltage alternating measurement mode and a bus topology connecting mode, the system is strong in interference immunity, high in measurement accuracy and low in false alarm rate in a harsh environment, and can be subjected to multistage expansion as required.

Description

technical field [0001] The invention relates to the technical field of insulation monitoring, and more specifically, to a distributed insulation resistance monitoring system. Background technique [0002] The mobile crane in the electrolytic metal smelting industry needs to monitor the insulation layer resistance and the voltage of the insulation layer of multiple mechanisms such as the hook, driver's cab, hydraulic station, etc., to avoid accidents and affect production due to insulation layer problems. Existing insulation measurement often adopts centralized low-voltage DC measurement method. Centralized low-voltage DC measurement device can be used to test insulation resistance and discharge static electricity, including DC power supply, control switch, insulation detection point, current sensor, current limiting resistor, voltage filter devices and monitoring devices. Among them, the insulation detection point is set at each position of the tested equipment that needs t...

AI Technical Summary

Problems solved by technology

[0004] 1. The centralized low-voltage DC measurement method can be used for measurement during the operation of the crane, but it is easily disturbed by the on-site environment, and there are many cases of false alarms, causing many users to shut down the system, thereby increasing the risk of insulation leakage

[0005] 2. When the crane mechanism touches the electrolytic cell, the DC high voltage of the electrolytic cell will be connected to the DC measurement circuit in series, which may cause damage to the measurement circuit and even damage to the driving control circuit

[0006] 3. The existing technology adopts a stand-alone monitoring system, and the detection information of all detection points is sent to the monitoring device uniformly, so that the connections between the detection points and the monitoring device are many and complicated, which increases the difficulty and workload of wiring

At the same time, the number of detection points in the stand-alone monitoring system is fixed, and the location is fixed. When it is necessary to arrange detection points for a new insulation resistance detection position, it is necessary to reset a group of centralized low-voltage DC measurement devices, which not only wastes resources, but also is difficult to centralize management.

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