Method for online monitoring internal environment of sealed high-voltage electrical apparatus
A technology for high-voltage electrical equipment and internal environment, applied in measurement devices, instruments, etc., can solve the problems of limited internal space of high-voltage electrical equipment, high failure rate of electronic devices, and difficult maintenance, and achieve the effect of ensuring safe and reliable operation.
Inactive Publication Date: 2015-12-09
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0004] However, the internal space of high-voltage electrical equipment is limited, which is not suitable for placing complex electronic monitoring devices, and it is impossible to take power from the finished sealed high-voltage electrical equipment. If the monitoring device comes with a battery, it will inevitably involve the problem of battery replacement. The high failure rate makes it necessary to open the casing for maintenance of high-voltage electrical equipment, resulting in leakage of sulfur hexafluoride and changes in detection status, which brings difficulties to maintenance
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[0021] The present invention is further described below in conjunction with the embodiments: an LC sensing loop is set inside the high-voltage electrical equipment, and the sensing loop includes an air pressure detection loop, a humidity detection loop and a temperature detection loop, and the detection loop is a belt connected only by an inductance and a sensitive capacitor. The loop of the internal antenna of the equipment; a signal receiving device with an external receiving antenna and an adjustable signal transmitting device with an external transmitting antenna are set within the effective range of the wireless signal outside the high-voltage electrical equipment, and the signal receiving device and the adjustable signal transmitting device are controlled by The system is connected and controlled, and the control system is connected with a communication device communicating with the control center.
[0022] When it is necessary to obtain the air pressure detection paramet...
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Provided is method for online monitoring the internal environment of a sealed high-voltage electrical apparatus. The method is characterized by providing an LC sensing circuit just formed by an inductor and an air pressure sensitive capacitor inside the high-voltage electrical apparatus; enabling an adjustable signal emitter to emit an excitation signal with continuously-changed frequency by using the preset end value of the resonant frequency of the LC sensing circuit as an initial value; enabling a signal receiver to receive a signal; enabling a control system to acquire the value of the air pressure sensitive capacitor; acquiring a parameter value according to a function relationship between a parameter to be tested and the capacitor; and uploading an acquired air pressure value or frequency value to a control center via a communication device. The method completely prevents the leakage of the sulfur hexafluoride of the high-voltage electrical apparatus, minimizes the size of a sensor, and eliminates a power supply. A portable of fixed external device can be used and communicates with the control center. Then parameters of insulation gas inside the high-voltage electrical apparatus are known by controlling the external device so that the safe and reliable operation of the high-voltage electrical apparatus is effectively guaranteed.
Description
technical field [0001] The invention relates to the field of parameter detection of high-voltage electrical equipment, in particular to an online monitoring method for the internal environment of sealed high-voltage electrical equipment. Background technique [0002] The insulation status of high-voltage electrical equipment such as high-voltage transformers is directly related to the operating status of electrical equipment and the overall normal operation of the high-voltage system, and is related to large-scale national production and social life. Therefore, the insulation detection of high-voltage electrical equipment is of great significance. [0003] Sulfur hexafluoride gas can effectively monitor the state of insulation and is widely used in electrical equipment. The air pressure, humidity, temperature and other parameters of sulfur hexafluoride gas indirectly represent the insulation state, which is closely related to the pressure of the gas. influences. Therefore,...
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Inventor 杨武袁志刚崔勇李强袁红斌何传杰李海
Owner STATE GRID CORP OF CHINA