Handheld Zinc Oxide Arrester Live Analyzer 

I. LYYB-3000 Handheld Zinc Oxide Arrester Live Analyzer Features

This device is a handheld operating instrument with a large Chinese display, easy operation, and reliable data testing.

Weighing only 0.5kg, it is significantly lighter than other similar instruments while offering more powerful functions.

It simultaneously tests the total current, resistive current, deflection angle, active power, capacitive current, and 3rd, 5th, 7th harmonic currents of three-phase arresters, and can directly evaluate the performance of the arrester (excellent, good, fair, poor).

This instrument can use electric field induction or wireless transmission methods instead of PT secondary wiring.

This instrument can directly measure resistive current without connecting to PT secondary.

This instrument offers multiple testing methods for convenience (PT, wireless, induction, no PT).

This instrument can test three phases simultaneously with automatic compensation, making it very convenient to use.

The instrument is equipped with an 8000mAh high-capacity lithium battery, allowing continuous operation for 36 hours on a single charge.

High-precision sampling and processing circuits, advanced Fourier harmonic analysis technology, ensure more reliable data. The instrument uses a unique high-speed magnetic isolation digital sensor to directly collect input voltage and current signals.

 

LYYB-3000 Handheld Zinc Oxide Arrester Live Analyzer Operation Modes

PT Mode

The instrument inputs PT secondary voltage as a reference signal, and simultaneously inputs the MOA current signal. After Fourier transform, the voltage fundamental wave U1, current fundamental peak Ix1p, and current-voltage angle Φ can be obtained. Therefore, the component in phase with the voltage is the resistive current fundamental peak (Ir1p), and the orthogonal component is the capacitive current fundamental peak (Ic1p): Ir1p=Ix1pCOSΦ       Ic1p=Ix1pSINΦ

Considering that δ=90°—Φ is equivalent to the dielectric loss angle, directly using Φ to evaluate MOA is also very simple: without "interphase interference", Φ is mostly between 81° and 86°. According to the requirement that "resistive current should not exceed 25% of total current", Φ should not be less than 75.5°. Refer to the table below for segmented evaluation of MOA performance:

Actually, attention should be paid when Φ<80°.

Grounding:

Connect the ground wire before measurement, and disconnect it last after measurement! If the grounding point has paint or rust, it must be cleaned thoroughly.

Reference Voltage

Insert one end of the reference voltage signal cable into the reference voltage socket, and connect the other end to the PT secondary low-voltage output of the phase under test: the small black clip connects to the neutral point (x), and the small red clip connects to phase B voltage). For external application method, connect to the measuring winding of the step-up transformer. If the PT is far away, an extension cable can be used.

Current Signal

First insert the leakage current signal cable plug into the instrument, then clip the other end (or attach via an insulating rod) to the upper end of the discharge counter of the MOA under test. In the laboratory, the MOA without a discharge counter can be placed on an insulating board, and the current signal can be taken from the lower end of the MOA. Extension cables cannot be used for the current signal.



Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.