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公开(公告)号：US11988713B2
公开(公告)日：2024-05-21
申请号：US17640774
申请日：2020-08-26
发明人： Wei Zeng , Min Chang , Xiaobeng Huang , Haiming Liao , Haisheng Jin , Enlin Wang
IPC分类号： G01R31/327 , G01N9/00 , H01H35/24
CPC分类号： G01R31/3274 , G01N9/00 , H01H35/24
摘要： A contact signal acquisition circuit for online checking a gas density relay on site is provided, including a first connecting circuit, connecting a contact of a gas density relay to a contact signal control loop, and a second connecting circuit, connecting a contact of the gas density relay to a contact signal sampling interface of an online check device. In a non-checking state, the second connecting circuit is disconnected, and the first connecting circuit is closed; and in a checking state, the first connecting circuit is disconnected, and the second connecting circuit is connected, so as to connect the contact of the gas density relay to the contact signal sampling interface of the online check device, guaranteeing that no contact action signal is uploaded during checking and safe operation of a power grid is not affected.
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公开(公告)号：US11988714B2
公开(公告)日：2024-05-21
申请号：US17640781
申请日：2020-08-26
发明人： Haiyong Jin , Yehong Wu , Xiaobeng Huang , Wei Zeng , Caixia Hao , Lele Wang
IPC分类号： G01R31/327
CPC分类号： G01R31/3278
摘要： A gas density relay check device and a check method thereof are provided. In check, a temperature adjusting mechanism and a gas density relay are relatively set. Temperature rise and fall of a temperature compensation element of the gas density relay is adjusted through the temperature adjusting mechanism, then the gas density relay is enabled to have a contact signal action. A gas density value is obtained according to the pressure value and the temperature value in the contact action. A contact signal operating value of the gas density relay is detected to check on the contact signal operating value of the gas density relay. The gas density relay check device of the present disclosure is capable of accurately checking gas density relays, and is particularly applicable to a gas density relay without a three-way valve, and check can be achieved without disassembling the gas density relay.
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