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0102030405
Huazheng HZJS-3 Lightning Surge Arrester Discharge Counter Tester
I. Principle
Figure 1 shows the principle wiring diagram of JS action counter. Figure 1 (a) is the basic structure of hzjs-type action register, namely the dual-disc structure.
Figure 1. Schematic wiring of hzjs-type action register
(a)JS Type； (b)JS-8 Type
R1、R2-Non-linear resistance；C-Energy storage capacitor
L-Register coil； D1~4Silicon diode
When the arrester operates, the discharge current flows through the valve sheet R1. The voltage drop across the valve sheet R2 charges the capacitor C, which then discharges the inductance coil L of the electromagnetic counter, causing it to rotate by one grid and record one count. By adjusting the resistance of R1 and R2, the sensitivity of the recorder can be changed. The typical minimum action current is 100A (8/20 µs) impulse current. Since there is a certain pressure drop across R1, this increases the residual voltage of the arrester, so it is mainly used for high-voltage arresters over 40 kV.
Fig. 1(b) shows the structure of this type of motion recorder, which uses a rectifying structure. When the arrester operates, the voltage drop across the high-temperature valve sheet R1 is charged to the capacitor C through full-wave rectification. The capacitor then discharges the inductance coil L of the electromagnetic counter, causing it to count. The resistance value of the valve sheet R1 in the counter is low (the pressure drop at 10 kA is 1.1 kV), the current-carrying capacity is high (1200 A square wave), and the minimum operating current is 100 A (8/20 µs) impulse current.
II.Technical Parameter
1、Output voltage：DC1600V ±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
III.Inspection Methods And Principles
Due to poor sealing, the counter may be exposed to moisture during operation, which can cause internal components to rust and prevent the counter from operating normally. Therefore, the "Regulations" stipulate that the meter should be checked once a year. There are three methods for testing: the direct current method, the alternating current method, and the standard impulse current method. Research shows that the standard impulse current method is the most reliable, and its wiring diagram is shown in Figure 2.
Fig. 2 principle wiring of standard impulse current detection method
（The part of the dotted box is an impulse current generator）
C-Charge capacitance；R-Charging resistance；L-Damped inductor
D-Silicon diode rectifier；r-Shunt；B-Testing transformer
V-Electrostatic voltmeter；CRO-High voltage oscilloscope
If an 8/20 µs, 100A impulse current wave produced by the impulse current generator is applied to the action recorder, and the recorder operates normally, the instrument is functioning properly. If the recorder does not operate correctly, it should be dismantled and repaired. For example, a power bureau used this method to test 27 counting devices, of which 3 were not moving. Upon disassembly, the internal components were found to be damp and damaged.
The Regulations stipulate that continuous testing should be conducted 3 to 5 times, with each test yielding normal results. The time interval between tests should be no less than 30 seconds. After testing, the recorder should be reset to 0.
Matters Needing Attention
1.When dismantling the connection, if the output voltage does not return to zero, the operator must not touch the non-insulated part of the test line to avoid personal injury.
2.The tested product must not be charged.
Packing List
|
No. |
Item |
Qty |
|
1 |
Main engine |
1 |
|
2 |
Power line |
1 |
|
3 |
Fuse pipe |
2 |
|
4 |
Red test line |
1 |
|
5 |
Black test line |
1 |
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