With an SF6 dew point meter, why install a micro water integrated monitor?- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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With an SF6 dew point meter, why install a micro water integrated monitor?

发布时间：2016-09-26 来源：ydlcb 浏览次数：34次

The measurement of SF6 dew point meter has the following defects:

A. Not online

SF6 dew point meter is used for regular detection, which is a non-online detection method, and can not reflect the operating status and dynamic changes of the equipment in real time. The maintenance of equipment and the automation of power distribution network in the true sense cannot be realized.

Weavers Inspection's micro-water integrated online monitor enables comprehensive online accurate measurement of humidity, density and temperature in the SF6 chamber of the high voltage circuit breaker without releasing SF6 gas, automatic activation of the alarm, locking device and real-time remote data transmission. It can meet the comprehensive online monitoring of SF6 gas status of SF6 high voltage circuit breaker, and provide technical guarantee for substation comprehensive automatic control and equipment status maintenance.

B. The measurement is limited by the ambient temperature.

The temperature of the instrument should not be lower than the ambient temperature during testing. The storage and working temperature of the instrument is -10℃ ~ +50℃. At the same time, different ambient temperatures, the measurement range is different (the following table). As can be seen from the table, the northern winter and the southern summer are not suitable for field testing. The relevant data can be found in the Conversion table of Dew Point (DP) to Water Content Volume ratio (ppmv).

Measuring range (dew point)	Ambient temperature
-60℃ (min)	10 ℃ or less
-55℃ (min)	20 ℃ or less
-45℃ (min)	35 ℃ or less

C. It takes time, effort and energy

During the test, SF6 gas is emitted for a long time. Because the sampling line contains moisture. Dry the sampling line at least 10 minutes before the measurement. A complete and accurate test takes about 45-55 minutes. According to the standard sample gas flow rate, that is, 30 to 40L/h, a test needs to emit about 35 liters of SF6 gas. Therefore, SF6 gas should be supplemented after the test is completed. The following figure shows the change curve and time required for the dew-point meter to reach a stable value.