How to verify the SF6 gas density relay?- 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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How to verify the SF6 gas density relay?

发布时间：2018-08-22 来源：ydlcb 浏览次数：46次

SF6 electrical products have been widely used in the power sector, industrial and mining enterprises, to promote the rapid development of the power industry. SF6 gas density relay is one of the key components of SF6 electrical switch. It is used to detect the change of SF6 gas density in SF6 electrical equipment body. Its performance directly affects the reliable and safe operation of SF6 electrical equipment. SF6 gas density relays installed in the field often have inflexibility or poor contact after a period of time due to infrequent action, and some also have poor temperature compensation performance, which is easy to cause misoperation of SF6 gas density relays when the ambient temperature changes. From the actual operation, regular calibration of SF6 gas density relays on site is one of the necessary means to prevent problems and ensure the safe and reliable operation of power equipment.

In a sealed container, SF6 gas pressure at a certain temperature can represent SF6 gas density. In order to be unified, it is customary to take the pressure of SF6 gas at 20 ° C as the representative value of its corresponding density. Therefore, SF6 gas density relays use the pressure of SF6 gas at 20 ° C as a scale value. During on-site verification, the measured pressure value should be converted to its corresponding standard pressure value at 20℃ under different ambient temperatures, so as to judge the performance of the SF6 gas density relay.

The WINFOSS-A22 SF6 density relay calibrator developed by Weavers is a fully automatic and intelligent SF6 gas density relay calibrator. Using embedded microprocessor, the calibrator can verify the performance of various SF6 gas density relays, normal temperature pressure gauges and P20 pressure gauges. The calibrator can be used for the production, maintenance and monitoring of SF6 gas products, especially for power systems, and provides convenience for the production and safe operation of SF6 electrical products.

The density relay was tested by the charging process of SF6 equipment

(1) Temperature has a large impact, and it is difficult to ensure accuracy.

(2) Using the meter reading on the SF6 gas cylinder, the accuracy is very poor, and the accuracy cannot be guaranteed.

(3)SF6 density relays are actually used in the step-down process, and using the inflation process to test is inconsistent with the actual application, and also affects the accuracy of the test.

Because the SF6 gas density relay like other manometers after a period of use, its alarm and lock value will produce a certain drift; In addition, because the contact action of the density relay is not frequent, the contact action may be insensitive or ineffective. If not inspected, there is a security risk. Density relay quality problems exist for the following reasons:

(1) Its own vibration resistance is not enough, after the strong impact of the switch closing, the pointer is stuck, the contact will never fail (no action or always action), and the deviation exceeds the standard.

(2) Due to oil leakage, its vibration resistance is reduced, and after the strong impact of switch closing, the pointer is stuck, the contact will never fail (no action or always action), and the deviation exceeds the standard.

(3) Because the commonly used relay contact is a magnetically assisted electrical contact, the contact closing force is small, the time is slightly longer, and the contact will be blocked or the contact is not reliable. For oil-free, magnetic-assisted electric contact contacts exposed to air, very easy to oxidize or accumulate dust, the contact is easy to contact poor or impassable; For oil-filled, magnetically assisted electric contact contacts although