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SF6安全保障专家
专注于SF6气体检测的专业化
Why check SF6 gas density relays regularly
发布时间：2017-08-05
来源：ydlcb 浏览次数：33次
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.
Verification basis: The former Guodian Company attached great importance to the regular inspection of SF6 gas density relays. DL/T596-1996 "Preventive Test Procedures for Power Equipment" and the National Energy Administration "Twenty-five Key Requirements for the Prevention of Power Production Accidents and the preparation of interpretation" 13 "to prevent GIS, switchgear accidents" article 13.1.6, the State Grid Company "State Grid Company" eighteen major anti-accident measures of the power grid "revised version The connection between the sulfur hexafluoride density relay and the switchgear body in Item 12.1.1.6 of "Preventing GIS and Switchgear Accidents" must meet the requirements that the parity density relay is not disassembled.
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 the oil-filled type, the magnetic-assisted electric contact contact is immersed in silicone oil, but for a long time, after several moves, its contact performance will decline, and the oil film has an insulating effect, and the contact will also be poor or blocked.
(4) Due to its own manufacturing quality problems, there is inaccurate temperature compensation, and the error is seriously large (overcompensate or undercompensate).
(5) Due to insufficient aging or material problems, for a long time, it will drift, and the accuracy will be seriously large (the stress is not eliminated).
(6) Due to design defects, there will be failure at low temperatures (never operate).
(7) Due to design defects, the action and display value will be seriously deteriorated at high temperatures.
(8) For relative cavity density relays, due to internal or external reasons, the standard cavity will leak air, and there is a large error or failure of the action value.
(9) Due to severe vibration during transportation, the relay will fail and the accuracy will deteriorate.
(10) Due to the quality problems of the components, the time is slightly longer, which may cause relay failure and poor accuracy.
(11) Because the shell vent is not loosened, or the shell sealing problem, there is a change in the internal pressure of the shell, which is a change in accuracy.
(12) Due to the erosion of rain or corrosive gases, the relay will fail and the accuracy will deteriorate.
(13) Due to improper use, it will also affect use. (Installation position)
(14) Due to process problems, it will cause the failure of the density relay, or the accuracy is poor.
(15) Due to the switch factory or relay in order to reduce costs, the selection of inferior products or components.
(16) Electrical performance: insulation problems.
(17) Sealing performance.
Inspection basis
DL/T596-1996 Procedure for Preventive Testing of Electric Power Equipment, January 1, 1997
25 Key Requirements for the Prevention of Major Accidents in Power Production, issued on September 28, 2000
The National Energy Administration's 25 Key Requirements for Preventing Power Production Accidents, issued on April 16, 2014