Method and system for monitoring oil level of oil-immersed high-voltage electrical apparatus

Abstract

The invention provides a method and a system for monitoring the oil level of an oil-immersed high-voltage electrical apparatus and belongs to the technical field of intelligent monitoring of the power systems and the associated apparatuses thereof. The method comprises step a, starting the system, step b, running system self-inspection, step c, determining whether system self-inspection is normal, step d, outputting a fault signal, step e, acquiring a static pressure, step f, inputting into a PLC and calculating the current oil level, step g, calculating the current oil temperature t at the oil level, step h, determining whether the current oil temperature t is above a safe oil temperature upper limit, step i, judging that the oil level is too high, step j, determining whether the current oil temperature t is below a safe oil temperature lower limit, step k, judging that the oil level is too low, and step l, determining reset or nor by use of the PLC. An oil level sensor is arranged at the bottom of a lower oil tank; the wire of the oil level sensor is drawn out of a junction box and then is connected with the input port of the controller. According to the method and the system for monitoring the oil level of the oil-immersed high-voltage electrical apparatus, the accurate oil level condition of the insulating oil of the apparatus can be monitored in real time, and the oil level can be converted into electrical quantity information and uploaded; as a result, online monitoring of the oil levels of the oil-filled electrical apparatuses is realized and the intelligence level of the apparatuses is improved.

Description

technical field [0001] The invention discloses an oil level monitoring method and a monitoring system for oil-immersed high-voltage electrical equipment, belonging to the technical field of intelligent monitoring of power systems and related equipment. Background technique [0002] The insulating oil in oil-immersed high-voltage electrical equipment plays the role of insulation, heat dissipation or arc extinguishing. Too high or too low oil level will affect its safe operation. Excessive oil level may be caused by factors such as high ambient temperature, heavy equipment load, unreasonable design of oil conservator capacity, and internal heating faults, which will increase the internal pressure of the equipment, easily cause equipment damage, and cause power outages; oil level The reduction may be caused by factors such as low operating environment temperature, unreasonable design of the capacity of the oil conservator, and oil leakage caused by poor equipment sealing, which...

AI Technical Summary

Problems solved by technology

In this solution, because the top of the high-voltage electrical equipment is at a high potential, even if the sensor is installed, the signal power supply is difficult to solve due to insulation problems, and there is no electrical signal output. It is necessary to obtain oil level information through manual inspections

There are many disadvantages in this solution. First, due to the long period of regular equipment inspections, the oil level information of insulating oil cannot be monitored online, which affects the collection of equipment status information.

The second is that after the equipment has been operated with electricity for a long time, the oil level indicating device is aging or dirty, causing the ground inspectors to keep a safe distance from the electrification, and cannot correctly identify the oil level of the insulating oil. It is also limited by the installation location, and the live inspection is extremely inconvenient. Leaving a hidden danger to the safe operation of the equipment

The third is that the oil level display device of this solution is at a high potential. Once there is oil leakage, inaccurate indication, etc., which will affect the operation of the equipment, the equipment must be immediately powered off to eliminate the defect.

Fourth, the oil level information of oil-immersed high-voltage electrical equipment is qualitative information of non-electrical quantities, which requires manual input and cannot be automatically uploaded and intelligently analyzed, which seriously affects the improvement of the overall intelligence level of electrical equipment and substations

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