YHX Zinc Oxide Surge Arrester Tester

1、 Introduction:

YHX Zinc Oxide Surge Arrester TesterIt is one of our factory's series of localized products and a specialized instrument for detecting the various electrical characteristics of zinc oxide lightning arresters in power system operation.
It has the following advantages:
1. Liquid graphics display, Chinese printing, intuitive interface, high degree of automation, easy for on-site personnel to operate and use.
2. Advanced digital signal processing technology, strong anti-interference performance, high measurement accuracy, users can directly observe signal waveforms from the LCD screen, with oscilloscope function.
3. Reliable, using isolation transformers and high resistance voltage dividers to avoid PT secondary side short circuits.
4. Small in size, lightweight, and easy to carry.
2、 Technical features:
1. Power supply: AC 220V ± 10%, 50Hz ± 1%.
2. Reference voltage input range: AC10~220V.
3. Measurement parameters:
a、 Leakage current of lightning arrester full current (including harmonics): I1 I3 I5 I7.
b、 Leakage current resistive component (including harmonics): IR1 IR3 IR5 IR7.
c、 Peak resistive current: positive peak Ir+negative peak Ir-
d、 Peak current: Ip
e、 Operating (or testing) voltage value (including harmonics): U1 U3 U5 U7
f、 Power consumption of lightning arrester: Pw
4. Measurement accuracy: 5%
5. Measurement range: Leakage current: Ix=0-10mA
3、 Testing method:
（1） Online testing:
The test circuit is shown in Figure 1. PT is a voltage transformer in phase with the tested object, and MOV is the tested object.

（2） Offline testing:
The test circuit is shown in Figure 2. When wiring, please connect a 100 Ω -200 Ω resistor in series between the zinc oxide lightning arrester and the ground wire to ensure the continuity of the test circuit.

4YHX Zinc Oxide Surge Arrester Testeroperating steps
The panel layout of the live testing instrument for zinc oxide lightning arrester is shown in Figure 3.

(This tester has four buttons, the overall button method is: up button, down button to select the corresponding menu column, confirm button and exit button to modify values or enter the next * * menu).
1. After connecting the test circuit according to Figure 1 or Figure 2, turn on the power of the tester.
2. Move the cursor to the "Variable Ratio Input" position to input the variable ratio. The variable ratio refers to the ratio of the operating voltage (or test voltage) to the voltage signal connected to the voltage channel of the tester. For the variable ratio in Figure 1 with PT wiring, and for Figure 2 with wiring, it is the variable ratio of the test transformer. Please note that for some test transformers with measurement windings, if the voltage signal is connected to the measurement winding, the variable ratio of the input test voltage to the measurement winding voltage will be used.
3. Move the cursor to the 'Voltage Channel' position and select the corresponding channel for voltage signal access on the panel.
4. Move the cursor to "coarse measurement" or "fine measurement". "coarse measurement" is used for simple measurement, with a testing time of about 4 seconds. "fine measurement" is used for more complete testing, with a testing time of about 15 seconds.
After pressing the confirm button, the interface shown in Figure 4 can be seen:
The voltage value in Figure 4 is the test voltage value, which can be updated in real time. Users can observe whether the test voltage is reached through this file. After confirming, the tester starts testing and outputs the results.
The output result under the 'rough measurement' mode is shown in Figure 5
I1 is the effective value of the full current
IP is the peak value of full current
Ir1 is the effective value of the fundamental wave of resistive current
Ir+is the positive peak value of resistive current
Ir - is the negative peak value of resistive current
U1 is the effective value of the fundamental voltage wave
PW is active power
When shown in Figure 5, pressing the confirm button will enter the interface for printing data, and pressing the other three buttons can repeat the test. In the 'fine measurement' mode, the full current, voltage, fundamental wave of resistive current, and effective values of 3rd, 5th, and 7th harmonics will be displayed on separate screens. The peak value of full current, positive and negative peak values of resistive current, and active power will be displayed. Press the confirm button to enter the next screen during operation, and press the exit button to return to the previous screen.
Viewing waveform usage:
After entering the transformation ratio and voltage channel, move the cursor to the "View Waveform" level and press the confirm button to view the waveform of voltage and current. The waveform can be refreshed in real time. When displaying the waveform, there are several buttons that can be used to read the waveform data
1. Press the up key to display data point by point forward.
2. Press the down arrow key to display data point by point backwards.
3. Simultaneously press the up and confirm keys to quickly display data forward.
4. Simultaneously press the down and confirm keys to quickly display data backwards.
5. Press the confirm button to continue displaying the waveform.
6. Press the exit button to return to the main menu.