Isolation structure for measuring external electric interference signals by pressure fluctuation of hydraulic turbine
A technology of electrical signal isolation and pressure pulsation, applied in measuring devices, measuring fluid pressure, instruments, etc., can solve problems such as affecting the hydraulic stability of the turbine, affecting the measurement accuracy of pressure pulsation, and unsafe operation of the unit.
Inactive Publication Date: 2011-07-27
HARBIN ELECTRIC MASCH CO LTD
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Problems solved by technology
In the process of pressure pulsation measurement, this potential difference will be used as an interference signal to affect the measurement accuracy of pressure pulsation, thus directly affecting the judgment of the hydraulic stability of the turbine, and even causing potential safety hazards to the reliable operation of the unit
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[0007] Such as figure 1 As shown, a hydraulic turbine pressure pulsation measurement external interference electrical signal isolation structure, the vertically arranged pressure pulsation measuring tube 5 with external thread passes through the pipe collar 3 with internal thread at both ends and such as figure 2 The isolation seat 2 of the structure shown is connected, and the isolation seat 2 is connected with the pressure pulsation sensor 1 with an external thread on the top through an internal thread, and the lumen formed by the isolation seat 2, the pipe collar 3 and the pressure pulsation measuring tube 5 is filled with insulating oil , the interface 4 between the insulating oil and the water column in the pressure pulsation measuring tube 5 is located in the pressure pulsation measuring tube 5 .
[0008] The working principle of the present invention: the interference electrical signal on the wall of the pressure pulsation measuring tube 5 cannot be transmitted to the ...
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The invention relates to an isolation structure for measuring external electric interference signals by the pressure fluctuation of a hydraulic turbine. The method is characterized in that a pressure fluctuation measuring pipe which is vertically arranged and has outer thread is connected with an isolation seat through a pipe hoop with inner threads at both ends thereof, the isolation seat is connected with a pressure fluctuation sensor with outer thread at the top thereof through inner thread, a pipe cavity which is formed by the isolation seat, the pipe hoop and the pressure fluctuation measuring pipe is filled with insulating oil, and the interface of the insulating oil and a water column in the pressure fluctuation measuring pipe is arranged in the pressure fluctuation measuring pipe.The electric interference signals which are transmitted to the pressure fluctuation sensor probably through a measuring pipeline and the measured water are respectively isolated by the isolation seatand the insulating oil, and the insulating effect between the isolation seat and the insulating oil is very good, thus fundamentally solving the influence of the external electric interference signals on the pressure fluctuation sensor.
Description
[0001] Technical Field: The present invention relates to a structure for isolating electrical signals from external disturbances in hydraulic turbine pressure pulsation measurement. Background technique: [0002] With the gradual improvement of users' requirements for the stability of hydro turbines, ensuring the safe and stable operation of hydro turbines, especially giant hydro turbines, has become an important indicator for evaluating the operating status of units. The measurement of pressure pulsation has become a key item to measure the stability of the turbine. Since the construction of a hydropower station is a very complex system engineering, there are a large number and various types of electromechanical equipment, and more or less there will be a certain potential difference between the measurement pipeline system connected to the sensor and the ground for some reason. In the process of pressure pulsation measurement, this potential difference will be used as an inte...
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IPC IPC(8): G01L19/00
Inventor 赵越赵景芬覃大清赵英男
Owner HARBIN ELECTRIC MASCH CO LTD