The reasons for generating a secondary open circuit of the current transformer are as follows:
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(1) Due to the defects in the structure and quality of the test terminal in the AC current loop, the screw and the copper plate screw hole are in poor contact during operation, resulting in an open circuit.
(2) Since the glue wood of the test terminal pressure plate in the current loop is too long, the metal piece of the rotary terminal is not pressed on the metal piece of the pressure plate, and is mistakenly pressed on the bakelite sleeve, thereby causing an open circuit.
(3) Mistakes in the work of the repair personnel, such as forgetting to connect the internal connector of the relay and fail to find it during acceptance.
(4) The secondary wire terminal fitting is not tightly pressed, and when the current in the circuit is large, the heat is blown or oxidized to cause an open circuit.
(5) The outdoor terminal box and junction box are damp, and the terminal screws and gaskets are rusted too much, resulting in an open circuit.