Fault early warning method and system for dual-mode shield tunneling machine

Abstract

The invention discloses a fault early warning method for a dual-mode shield tunneling machine. The fault early warning method utilizes a current transformer and a zero-sequence transformer for respectively detecting three-phase currents of a wire inlet side of a motor and a zero-sequence current; current signals and three-phase voltages of the motor are accessed to a motor protector, and whether the motor undergoes overload, underload, open-phase, locked-rotor, short-circuit and unbalanced protection of a three-phase circuit or not is judged by comparing the detected voltage and current valueswith protection values set in the motor protector. The invention further discloses a fault early warning system for the dual-mode shield tunneling machine. The fault early warning system and the fault early warning method have the advantages that motor faults can be diagnosed on line, early warning and health management are achieved, and the motor is protected; lots of operation, maintenance anddiagnosis data are provided, so that the health state of the motor is more transparent and controllable, and the motor is prevented from being damaged; electrical elements such as ampere meters, voltmeters, thermal relays, current transformers, time relays and leakage relays can be replaced, and a control circuit is optimized.

Description

【Technical field】 [0001] The invention relates to the technical field of shield machine fault early warning, in particular to a fault early warning method and system for a dual-mode shield machine. 【Background technique】 [0002] The shield machine is a large-scale mechanical equipment widely used in subway, railway, highway, municipal, hydropower and other tunnel engineering constructions. It integrates rock breaking, slag removal, lining and support, and has a high degree of automation, fast speed and safety. Efficient and other features. [0003] During the tunneling process of the shield machine, the real-time operation data of the load in the electrical control system cannot be intuitively reflected, and load faults cannot be detected online, and early warnings cannot be made, such as over-current, under-current, humidity, stalled rotor, three-phase When the circuit breaker trips due to current imbalance, phase failure, overvoltage, undervoltage, leakage, short circuit...

AI Technical Summary

Problems solved by technology

[0003] During the tunneling process of the shield machine, the real-time operation data of the load in the electrical control system cannot be intuitively reflected, and load faults cannot be detected online, and early warnings cannot be made, such as over-current, under-current, humidity, stalled rotor, three-phase When the circuit breaker trips due to current imbalance, phase failure, overvoltage, undervoltage, leakage, short circuit and other faults, only the load circuit breaker trip alarm can be detected, and the cause cannot be known. There is a lot of interference, and it is necessary to check item by item to find the cause of the failure.

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