Huazheng HZ-20AS Handheld Portable Lighting Arrester Tester

1 .Reference Voltage Measurement

1.1 Reference voltage input range: 25V～250V RMS,50Hz/60Hz

1.2 accuracy of reference voltage measurement: ± (reading × 5% + 0.2V)

1.3 accuracy of voltage harmonic measurement:  ± (reading × 10%)  

1.4 reference voltage channel input resistance: ≥1500kΩ  

2.1Whole current measurement range: 0 ～ 20mA RMS,50Hz/60Hz

2.2 Accuracy: ± (reading × 5% + 5uA)

2.3 fundamental wave measurement accuracy of resistive current: ± (reading × 5% + 5uA)  

2.4 Current harmonics measurement accuracy: ± (reading × 10% + 10uA)

2.5 Current channel input resistance: ≤ 2Ω 

3 .Electric-field Intensity Measurement

3.1 input range of electric field strength: 30kV/m～300kV/m

3.2 accuracy of electric field intensity measurement:± (reading × 10%)

3.3 accuracy of electric field harmonic measurement: ± (reading × 10%)

4. Service Conditions And Shape

4.1 power supply：built-in lithium battery or external charger, charger input 100-240VAC 50Hz/60Hz,output DC8.4V 2A

4.2 Charging time: 4 hours

4.3 Battery life: host:8h, Voltage Collector: 8h

4.4 size of the host: 246mm (length) × 156mm (width) ×62mm (height)

4.5  weight of the host：1.0kg (excluding cables)

4.6 size of the voltage collector : 115mm (length) × 120mm (width) × 65mm (height)

4.7 voltage collector :  0.6kg (excluding cables)

4.8 service temperature: -10℃～50℃

4.9 relative humidity: ＜90%，No condensation

When the three phases test the zinc oxide arrester arranged in-line at the same scene , as shown in Figure 2, due to the existence of stray capacitance, the current phase of A and C offset to B phase, and the general offset angle is 2°～4° or so, which will make phase A φ decrease, resistive current increase, phase C φ increase, and resistive current decrease or even become negative. This phenomenon is called interphase interference.

The method to solve this problem is to adopt automatic compensation algorithm, which is the built-in "automatic edge repair" function. Assuming that the phase difference of Ia and Ic is 120°when there is no interference, and the interference of B to phase A and C is the same, and then measure Φca--the angle of Ic advanced Ia, phase A compensation Φ A = 0 (Φ ca - 120 °) / 2, phase C compensation Φ0c= -（Φca -120°）/2. This method actually averages the resistance of phase A and C, and it is greatly likely to cover up the existing problems. Therefore,it is recommended to assess the original data without automatic compensation, (namely the compensation angle is 0°), and assess the trend of change.