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Principle
Figure 1 shows the principle for the principle of action
visitor counter type JS hookup. Figure 1 (a) for JS type
action visitor counter the basic structure, the so-called
double valve chip structure. When lightning arrester action,
discharge current flow through valve slice R1, the pressure
drop in R1 by valve slice R2 give capacitor C charging,
then C again to assolenoid style of inductance coil L discharge
visitor counter, make its rotation 1 case, remember one
times. Change R1 and R2 resistance, can make the visitor
counter with different sensitivity. Generally minimum operating
current for 100A (8/20 mu s) current impulse. Because R1
there are certain pressure drop, will make the lightning
arrester residual pressure increases, so it is mainly used
for 40kV above the high-pressure arresters.
Figure 1 (b) says JS - 8 type action of structure, visitor
counter is rectifier type structure. Lightning arrester
action, high-temperature valve plates on the pressure drop
by R1 whole wave rectifier to capacitor C charging, then
C again to assolenoid style visitor counter L discharge,
make its counting. The visitor counter of valve plates R1
resistance of smaller (in 10kA when the pressure drop was
1.1 kV), the flow capacity is big (1200A square-wave), minimum
operating current also for 8/100A (20s) the impact of the
current. JS - 8 type visitor counter can be used for 6.0
lightning arrester, 330kV system ~ JS - 8A type visitor
counter can be used for lightning arrester 500kV system.
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