Transformer nitrogen charging fire extinguishing cutoff valve action threshold verification system and method

Abstract

The invention discloses a transformer nitrogen charging fire extinguishing cutoff valve action threshold verification system and method. The system comprises a cutoff valve, a transformer, an oil storage cabinet, a flow meter, a pressure sensor, a variable frequency oil pump and an adjusting valve. The cutoff valve is arranged on a first pipeline for connecting the transformer and the oil conservator; an oil outlet of the transformer is connected with a second pipeline, a first adjusting valve is arranged at the oil outlet, a flow meter, a second adjusting valve, a pressure sensor, a variable-frequency oil pump and a third adjusting valve are sequentially arranged on the second pipeline, and the other end of the second pipeline is connected to an oil conservator to form a calibration loop.The original loops of the transformer body and the oil conservator are utilized, and the flowmeter, the pressure sensor, the variable-frequency oil pump and the regulating valve form a cyclic verification loop, so that the online verification of the action threshold of the stop valve is realized.

Description

technical field [0001] The invention relates to the technical field of cut-off valve calibration, in particular to a system and method for checking the action threshold of a nitrogen-filled fire extinguishing cut-off valve of a transformer. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] When the large main transformer of 220kV and above in the fire-fighting facilities is on fire or other accidents, the nitrogen-filled fire extinguishing device is used to extinguish the fire, which can effectively prevent the accident from worsening. The nitrogen-filled fire extinguishing device should be routinely checked to prevent the nitrogen-filled fire extinguishing device Move, refuse to move. As an important component of the nitrogen-filled fire extinguishing device, the transformer cut-off valve is used to block the backup oil from the oil conser...

AI Technical Summary

Problems solved by technology

[0004] The internal structure of the existing cut-off valve is adjusted by a spring. Due to the production batch difference of the spring itself, installation problems, aging and other reasons, the action threshold changes, and the accuracy of the stop valve action threshold directly affects the reliability of the equipment. Operation, when the action threshold is too low, when the main transformer changes in seasons, the oil flow caused by the thermal expansion and contraction of the insulating oil itself may cause the shut-off valve to close and cause the main transformer to stop running; while the action threshold is too high, when the main transformer In case of fire, it cannot be closed reliably, and it cannot be filled with nitrogen to extinguish the fire

At present, the cut-off valve of the main transformer needs to be disassembled and returned to the factory for testing. The main transformer needs to be shut down and the oil should be drained for disassembly. After the calibration, the main transformer needs to be supplemented with oil and vented.

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