Automatic shutdown method of electric towing turbine unit in failure of controlling system and oil system

Abstract

The invention discloses an automatic shutdown method of an electric motor towing turbine unit in failure of a controlling system and an oil system. A normally opened pressure switch is arranged on a lubricating oil supplying main pipe of the electric motor towing turbine unit, and when the pressure of the lubricating oil is as low as the preset value, the contact of the pressure switch is closed. A pressure switch normally closed contact of the lubricating oil supplying main pipe and a number 1 and number 2 lubricating oil pump motor alternating current contactor normally closed auxiliary contact which are sequentially connected in series are connected into a high-voltage control loop 220-V direct current power supply together with a tripping mechanism of a vacuum breaker to form a safe shutdown control loop. When the safe shutdown control loop is closed, the tripping mechanism of the vacuum breaker in an operation cabinet of the electric motor towing turbine unit is powered on, and the electric towing turbine unit is shut down in interlocking mode. Safe shutdown of the electric towing turbine unit is ensured when the control system and the oil system are failed, and the phenomenon of wrong shutdown caused by wrong operation of the alternating current contactor normally closed auxiliary contact of the pressure switch contact of the lubricating oil supplying main pipe or a lubricating oil pump motor is avoided.

Description

[0001] The invention belongs to the technical field of control systems of a motor-driven turbine unit, and relates to an automatic shutdown method for a motor-driven turbine unit when a control system and an oil system fail. Background technique [0002] Sliding bearings are generally used in motor-driven turbine units, and sliding bearings need to be lubricated by forced oil supply. Therefore, a lubricating oil system must be provided for the motor-driven turbine unit. The main function of the lubricating oil system in the motor-driven turbine unit is to provide lubrication, cooling, washing and other functions for the unit. When the lubricating oil system fails, if the unit is still running, it is very easy to cause damage such as overheating of the bearing bush of the unit, burning of the bearing, damage to the thrust plate, and wear of the blades. ACCIDENT. Therefore, when the lubricating oil system fails, the motor-driven turbine unit must be shut down urgently. [000...

AI Technical Summary

Problems solved by technology

However, there are some security risks in the above control method.

For example: when the low-voltage power supply 380V or 220V AC power supply of the motor drives the turbine unit is accidentally out of power, or the power supply of the automatic control system is out of power or the CPU crashes and other unexpected factors cause the lubricating oil pump to stop running, resulting in the pressure of the oil supply main pipe of the lubricating oil system being too low. If the automatic control system of the unit fails to work normally, the lubricating oil system will fail and the unit will not be able to stop automatically immediately, which will cause safety accidents

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