▍ brief 　↴

YLBL seriesZinc oxide lightning arrester live testerIt is a product developed and produced by Shaanxi Yilian Electric specifically for testing the electrical performance of various phases of zinc oxide lightning arrester (MOA)Zinc oxide lightning arrester testing instrumentThe live testing instrument for zinc oxide lightning arresters can timely detect dangerous defects such as insulation moisture and valve plate aging inside the arrester by measuring parameters such as full current and resistive current flowing through the arrester.

▍ Functional Features 　↴

●  Adopting high-performance, low-power ARM processors with DSP floating-point processing units, which have faster operation speed, higher accuracy, and larger data processing capacity; This can ensure the accuracy and stability of the test data calculation.

　● High precision sampling filtering circuit and digital filtering technology can filter out on-site interference signals.

　● Adopting floating-point fast Fourier algorithm to achieve high-precision analysis of fundamental, harmonic voltage, and current signals.

　● Adopting an industrial grade 5.7-inch 320 × 240 dot matrix monochrome LCD screen, the display is clear and the human-machine interface is friendly; Display prompt information and help instructions for some important operations and parameter settings; The status bar at the top of the screen can display the working and testing status information of various peripherals.

　● Can simultaneously measure the electrical parameters of three-phase zinc oxide lightning arresters and automatically compensate for phase to phase interference; It can also be measured single-phase and supports the PT secondary voltage of phase B grounding as the reference voltage; When the measured phase is different from the reference voltage phase, the compensation angle can be automatically calculated.

　● Provide wired and wireless testing methods, with wireless testing methods being easier and more flexible to operate; It can greatly reduce the workload of on-site testing personnel.

　● The voltage collector integrates local display (128 × 64 dot matrix OLED LCD screen) and phase sequence detection function, which can display three-phase full voltage, fundamental voltage, 3rd, 5th, and 7th harmonic effective values, system frequency values, and three-phase voltage phase difference; Facilitate on-site testing personnel to quickly check the connection between the voltage collector and the PT secondary voltage output terminal, as well as various parameters of the three-phase voltage.

　● The voltage collector adopts dual full digital isolation technology, which is safer and more reliable.

　● AC/DC dual-use: Built in lithium battery power supply or 220V AC charger power supply adaptive.

　● The instrument host and voltage collector are equipped with large capacity rechargeable lithium batteries, which can be charged in one go and can work continuously for 8 hours.

　● Intelligent battery management: remaining battery display, low battery alarm, long-term idle prompt, automatic backlight adjustment.

　● Built in real-time clock that can display the current time and date in real-time; Automatically record the testing date and time.

　● The storage methods for test data are divided into local storage and USB storage. Local storage can store 100 pieces of test data, and local storage can be converted to USB storage; USB storage can save test data and waveform images, with test data in TXT format and waveform images in BMP format, which can be directly edited and printed on a computer.

　● Built in thermal printer, capable of printing test data and saved test records; The printing content can be selected, which can save the amount of printing paper used.

▍ Technical Parameter 　↴

→Reference voltage channel input resistance: ≥ 1500k Ω

→Current channel input resistance: ≤ 2 Ω

→Accuracy of electric field harmonic measurement: ± (reading x 10%)

▍ Model specifications 　↴

▍ Working principle 　↴

Zinc oxide lightning arrester live testermeasuring principle

The working principle of the live testing instrument for zinc oxide lightning arrester adopts the projection method shown in Figure 1 to calculate the resistive current of the fundamental wave and each harmonic.

Zinc oxide lightning arrester live testerPhase to phase interference and automatic compensation principle

picture2 Interphase interference

When testing a zinc oxide lightning arrester arranged in a straight line simultaneously in three phases on site, as shown in Figure 2, due to the presence of stray capacitance, the phase of the A and C phase currents will shift towards the B phase, with a general offset angle of about 2 ° to 4 °; This will cause a decrease in phase A diameter, an increase in resistive current, an increase in phase C diameter, a decrease or even negative resistive current, a phenomenon known as phase to phase interference.

The solution to this problem is to use an automatic compensation algorithm, which is the built-in "automatic edge compensation" function of the instrument. Assuming that Ia and Ic have no interference, the phase difference is 120 °, and assuming that B has the same interference relative to phases A and C; Measure the angle Φ ca at which Ic leads Ia, compensate for phase A with Φ 0a=(Φ ca-120 °)/2, and compensate for phase C with Φ 0c=- (Φ ca-120 °)/2. This method actually averages the resistive currents of phases A and C, which is highly likely to mask the existing issues. Therefore, it is recommended to evaluate the raw data without automatic compensation (i.e. compensation angle of 0 °) and assess its trend of change.

▍ Instructions for use 　↴

Figure 18Wiring diagram of wired testing method (simultaneous measurement of three phases)

　　Wiring instructions for wired testing methodsThe wired testing method requires the use of communication cables to connect the instrument host and voltage collector, and to transmit and synchronize data through wired means. The wiring diagram is shown in Figure 18.
When wiring, the current and voltage must be connected in the correct phase sequence. The instrument host is set to wired testing mode, and the voltage collector is set to wired transmission mode.

　　Wireless testing method wiring instructionsWireless testing method: The instrument host and voltage collector transmit and synchronize data through wireless communication. The wiring diagram is shown in Figure 19.

Figure 19 Schematic diagram of wireless testing method wiring (simultaneous measurement of three phases)

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