High voltage power frequency warning grid

Its output voltage is 3kV at industrial frequency (50Hz). The power grid can be used for explosives, weapons depots
, etc.
    When minor faults such as porcelain bottle flashover discharge occur in the high-voltage power grid, the primary current of the step-up transformer T2 will increase.
The current signal is detected by the current transformer TAz, and a voltage signal is generated on its parallel resistor Ri. After rectification by the rectifier, Take out the voltage signal from
the voltage divider R2 and RP to turn on the thyristor V (the setting of RP can be adjusted), and the buzzer HA will sound an alarm
. SB is the alarm release button.
    If a metallic short circuit occurs in the high-voltage power grid, the circuit breaker QF2 will trip while the thyristor V is turned on, and
the red indicator light H2 connected in parallel with it will light up. The power grid is also equipped with a neon bubble indicator to indicate whether the high voltage is normal. When a ground
fault occurs, the neon bulb near the ground point will go out, making it easier to find the fault.
    Step-up transformer T2 uses JDJ-10/0. lkV, 640V. A voltage transformer.