2
the inductance coil L of the electromagnetic counter, making it rotate one grid and record
one time. Changing the resistance of R1 and R2 can make the recorder have different
sensitivity. The general minimum action current is 100A (8/20 s) impulse current. Because
there is a certain pressure drop on R1, it will increase the residual voltage of arrester, so it
is mainly used for high voltage arrester over 40 kV.
Fig. 1 (b) represents the structure of the type of motion recorder, which is a rectifying
structure. When the arrester operates, the voltage drop on the high temperature valve
sheet R1 is charged to capacitor C by full wave rectification, and then C discharges L of
the electromagnetic counter to make it count. The resistance value of the valve piece R1
of the counter is small (the pressure drop at 10 kA is 1.1 kV), the flow capacity is large
(1200 A square wave), and the minimum operating current is 100 A (8/20s) impulse
current.
III.Technical Parameter
1
、
Output voltage
：
DC3000V ±5%
2
、
Interval time
：
≥30s
3
、
Power supply
：
AC200V±10% 50Hz±2%
4
、
Shock current
：
≥100A
（
8/20μs
）
5
、
Dimension
：
380×250×180mm
6
、
Weight
：
3kg
IV.Inspection Methods And Principles
Due to poor sealing, the action counter may enter moisture or moisture in operation,
which causes the internal components to rust, leading to the normal operation of the
counter. Therefore, the "Regulations" stipulate that the meter should be checked once a
year. There are direct current method, alternating current method and standard impulse
current method. The research shows that the standard impulse current method is the most
reliable and its principle wiring is shown in Figure 2.
