HVJF-99  Visual Ultrasonic Detector

Acoustic emission technology, a common on-line monitoring technology for partial discharge, is suitable for detecting the surface discharge or creepage of high-voltage electrical equipment, such as the supporting insulators of high-voltage transmission line, high voltage cables and accessories, etc.

HVJF-99 is exactly designed for this purpose. It is a sort of portable instrument powered by battery with ultra-low power dissipation. The high-brightness green-laser collimation equipment is convenient for the users to locate the target even under the strong light. The camera with telescopic function can achieve the visualization of partial discharge in ultrasonic detection. It can also take and save pictures of the discharge-parts when locating the fault of partial discharge. The earphone output can convert the ultrasonic signal to the acoustical signal that can be heard. It improves the efficiency and is suitable for multiple working occasions.

Technical parameters

Size of reflective disk: 360mm

Working temperature: -10℃～＋40℃ 

Storage temperature: -20℃～＋50℃ 

Working frequency: 40kHz

Earphone connection: 3.5mm jack

Laser source: P<20mW, 532nm

Operating system: Windows Embedded CE 6.0

Memory card: SD card (standard capacity: 2GB)

Display screen: 3.0 inch TFT color LCD screen, resolution: 640×480 

The instruction of detection sensitivity: the sensitivity detections are respectively described for corona discharge and spark-plug discharge at different discharge capacity and different detection distances.

1)  As for corona discharge:

The point-discharge adjusts the different discharge capacity by changing the shape of point, the section area and the height of point; only the point-discharges below 70pc have been selected for testing this time.

Table 1 Sensitivity (corona discharge) statistical table

2) As for spark-plug discharge

The characteristics of spark-plug discharge is that the spark plug starts to discharge when the voltage is applied to the incipient discharge voltage; and the apparent discharge of the spark plug will not increase as the voltage increases, but the acoustic signal generated by discharge are strengthened with it.

The test data in the table below is completed under the discharge voltage of 5kV. According to the data, the signal received by corona gun in the range of 15m shows an over-range state from the view of screen waveform, and 50dB may be the maximum value displayed at G0 tap.

Table 2 Sensitivity (spark-plug discharge) statistical table

FAQ:

1. When can I get the price?

We usually quote within 6 hours work time after we get your inquiry. If you are very urgent to get price, please call us or tell us in your email so that we will regard your inquiry priority.

2. What about the delivery time for production?

Honestly, it depends on the order quantity and the product. Usually our leading time is within 7 working days after order confirmation.

3. What is your payment terms?

We accept EXW, FOB, CFR, CIF, DDU, ect. You can choose the one which is the most convenient and cost effective for you.

4. How much will the Shipping cost and time be?

This will depend on size of your goods and method of shipping (by sea/ by air/by Express) and your designated seaport or airport. We will be grateful if you can spare us some minutes to evaluate the cost based on the information of product.

5. Could you please tell me the Warranty Period of your product?

Our warranty period is one year free and lifelong maintenance. If the product is damaged (if not man-made damage), in the first year,we will send free parts for replacement. Over warranty, maintenance is paid service.

6. Do you have Technical Backup to all customers from different countries?

To be sure,our technical support is always available and quick response.
We are manufacturer with much on-site testing experience, thus we know how to deal with your problems. Moreover, our engineers can go to your country to support if needed.