The zinc oxide arrester tester is simple to operate and convenient to use. The entire measurement process is controlled by a single chip microcomputer. It can measure the total current, resistive current and its harmonics, power frequency reference voltage and its harmonics, active power and phase difference of the zinc oxide arrester. The large screen can display the true waveforms of voltage and current. The zinc oxide arrester tester employs digital waveform analysis technology and uses software anti-interference methods such as harmonic analysis and digital filtering to ensure accurate and stable measurement results. It can accurately analyze the content of fundamental wave and 3-7th harmonics, and can overcome the influence of inter-phase interference and correctly measure the resistive current of the side-phase arrester.
The zinc oxide arrester tester is equipped with a high-speed panel printer and rechargeable batteries. It is very convenient for the testers to use on-site. The instrument adopts a unique high-speed magnetic isolation digital sensor to directly collect the input voltage and current signals, ensuring the reliability and security of the data.
1. Wired mode
The zinc oxide arrester tester uses the secondary voltage of the PT as the reference signal and simultaneously inputs the current signal of the MOA. Through Fourier transformation, the voltage fundamental component U1, the peak value of the current fundamental component Ix1p, and the current-voltage angle φ can be obtained. Therefore, the in-phase component of the voltage is the resistive current fundamental peak value (Ir1p), and the orthogonal component is the capacitive current fundamental peak value (Iclp): Ir1p = Ix1p * COSφ, Ic1p = -Ix1p * SINφ
Considering that 5 = 90″ – φ is equivalent to the dielectric loss angle, directly evaluating MOA using φ is also very straightforward: there is no “phase-to-phase interference”, and most are between 81° and 86°. According to the requirement that “resistive current should not exceed 25% of the total current”, φ cannot be less than 75.5°.
Grounding
Before measurement, connect the ground wire first. After the measurement is completed, remove the ground wire! If there is paint or rust at the grounding point, it must be cleaned thoroughly.
Reference voltage
The reference voltage signal line is inserted into the reference voltage socket at one end, and the other end is connected to the secondary low-voltage output of the tested phase PT: the small black clip is connected to the neutral point (x), and the small red clip is connected to the measured phase voltage (a/b/c). When using the external application method for measurement, it is connected to the measurement winding of the step-up transformer. If the PT is located far away, an extension cable can be used.
Current signal
First, insert the plug of the leakage current signal line into the zinc oxide surge arrester tester. Then, attach the other end of the clamp to (or use an insulating pole to connect to) the upper end of the discharge counter of the tested phase MOA. In the laboratory, the MOA without a discharge counter can be placed on an insulating board, and the current signal can be obtained from the lower end of the MOA. The current signal cannot be transmitted through an extension cable.
2. Wireless Mode
Just need a current line to obtain the current signal, and then the total current and resistive current can be measured. (This mode is a rapid test. Only the current signal of phase B is required. After measurement, it will be in a waiting state. Connect the upper ends of the discharge counters of phases A, B, and C in sequence. The printer starts working when it is the end of one phase measurement cycle. After the measurement is completed, turn off and exit.)
Current signal
First, insert the plug of the leakage current signal line into the zinc oxide surge arrester tester. Then, attach the other end of the clamp to (or use an insulating pole to connect to) the upper end of the discharge counter of the tested phase MOA. In the laboratory, the MOA without a discharge counter can be placed on an insulating board, and the current signal can be obtained from the lower end of the MOA. The current signal cannot be transmitted through an extension cable.
Post time: Apr-16-2026