Flow velocity measurement method and device for on-site calibration of gas relay
A technology of on-site calibration and measurement method, which is applied in measurement devices, fluid velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problem that the time cannot meet the on-site requirements, etc., and achieve the effect of convenient use and high measurement accuracy
Active Publication Date: 2014-10-15
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology
However, for some situations where the maintenance time is tight or emergency fault handling, the on-site requirements cannot be met in terms of time.
Method used
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[0025] Such as figure 1 As shown, a flow rate measurement method for on-site calibration of gas relays, including the following steps:
[0026] 1) Control and close the solenoid valve III and solenoid valve IV, turn on the power supply of the air pump, the gas flows through the one-way valve to pressurize the gas container, and the pressure measurement value is fed back to the single-chip microcomputer by the pressure module I;
[0027] 2) When the received pressure value is 10kPa greater than the pre-pressure setting value, turn off the air pump power supply, and adjust the pressure value through the solenoid valve IV to reach the pre-pressure setting value;
[0028] 3) Open solenoid valve I, solenoid valve II and solenoid valve III to make the pneumatic actuator move forward;
[0029] 4) Start timing when the solenoid valve III is opened, and detect whether the photoelectric switch is disconnected, and if it is disconnected, stop timing when the pneumatic actuator starts to...
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The invention relates to a flow velocity measurement method and a flow velocity measurement device for field calibration of a gas relay. The method comprises the following steps of: 1) controlling to close a solenoid valve III and a solenoid valve IV, switching on an air pump power supply, and allowing gas to flow through a one-way valve to pressurize an air capacitor, wherein a pressure measurement value is fed back to a singlechip through a pressure module I; and 2) switching off the air pump power supply when the received pressure value is 10kPa more than a preset pressure value, and regulating the pressure value to be up to the preset pressure value through the solenoid valve IV. The device comprises an air pump, the one-way valve, an air capacitor, a pressure module I, a solenoid valve I, a solenoid valve II, the solenoid valve III, the solenoid valve IV, a pneumatic actuating mechanism, a photoelectric switch, a pressure module II, the singlechip and an upper computer. Compared with the prior art, the method has the advantages of being high in measurement precision, providing powerful technical support for field calibration of a power grid non-electricity protection device, and the like.
Description
technical field [0001] The invention relates to a gas relay calibration technology, in particular to a flow velocity measurement method and device for on-site calibration of the gas relay. Background technique [0002] In the transformer oil tank, the common faults are inter-turn short circuit or interlayer short circuit of the winding. For the above short circuit, because the current value reflected in the differential protection of the transformer is small, it is not enough to make it operate, but the gas protection can operate under the above circumstances. The insulating oil inside the main transformer will produce pressure changes and volume expansion due to operation and faults. For internal faults (such as inter-turn short circuit, single-phase grounding faults, etc.) protection; for non-electricity protection of the main transformer, gas protection is an important protection method for internal faults of the main transformer; therefore, the importance of gas protect...
Claims
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IPC IPC(8): G01P5/00
Inventor 袁志文芮颖
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO