The secondary circuit is the general term for the protection, control, measurement, photoacoustic signals and connections of high-voltage equipment. Loop energization and withstand voltage test are two inspection methods for secondary equipment. Due to the complicated wiring of the secondary circuit, the following aspects should be paid attention to when conducting the test.
(1) Before the test, check the drawings and wiring to confirm that the tested circuit is no longer involved in the operating circuit, that no cross-current will occur, and that all connection points that should be disconnected have been disconnected or measures have been taken. measure.
(2) Before the test, the person in charge on duty and relevant personnel should be notified to stop other work on the circuit being tested, and personnel should be sent to guard all side doorways that may enter the test range to prevent outsiders from getting electric shock. .
(3) If the security grounding point, secondary working grounding and other connections of the transformer need to be removed during the secondary circuit test, they should be recorded clearly one by one to prevent omissions and errors when the work is completed and restored. This in turn causes secondary equipment performance changes and hidden defects.
(4) During the energization test of the secondary circuit of the voltage transformer, you should first check that the primary and secondary switches and fuses are indeed disconnected to avoid reverse charging or causing other circuit equipment to become electrified and cause accidents.