CONTACT SIGNAL ACQUISITION CIRCUIT FOR ON-SITE ON-LINE CHECK OF GAS DENSITY RELAY

摘要

A contact signal acquisition circuit for on-site on-line check of a gas density relay, comprising a first connection circuit and a second connection circuit, the first connection circuit connecting a contact of a gas density relay with a contact signal control loop, the second connection circuit connecting the contact of the gas density relay with a contact signal sampling interface of an on-line check device; in a non-check state, the second connection circuit is turned off, and the first connection circuit is turned on; in a check state, the first connection circuit is turned off, and the second connection circuit is turned on, so that the contact of the gas density relay is connected to the contact signal sampling interface of the on-line check device, ensuring that a contact action signal is not uploaded when check is performed, not affecting the safe operation of a power grid, and achieving maintenance-free of the gas density relay, greatly improving the benefits and improving the reliable and safe operation of the power grid.