AC voltage withstand test device

With the development of the national economy and the increase in the voltage level of urban power supply,With its reasonable process and structure, excellent electrical performance, and safe and reliable operating characteristics, it has been increasingly widely used both domestically and internationally. Especially in the field of high-voltage transmission, significant progress has been made. Compared with oil filled cables, cross-linked cables are easy to lay and install, have simple operation and maintenance, and do not have oil leakage problems. However, recent operations and research have shown that the insulation of cross-linked polyethylene cables is prone to dendritic discharge during operation, causing insulation aging and damage, seriously affecting the service life of cross-linked polyethylene insulated power cables. Therefore, fully understanding the insulation characteristics of cross-linked cables, timely and effectively discovering and preventing certain defects in insulation, is of great significance for ensuring the safe operation of equipment and even systems. The main factors affecting the insulation of cross-linked cables and the principle of cable handover tests were elaborated, and it was believed that it is necessary and feasible to conduct AC withstand voltage tests on cross-linked cables on site.

1、 Product Overview

AC voltage withstand test deviceAccording to the requirements of the test transformer standard DL/T848.2-2004, the product has the characteristics of small size, light weight, compact structure, complete functions, and easy use. It is a practical instrument used in power, industrial and mining, scientific research and other departments to conduct power frequency withstand voltage tests and DC leakage tests on various high-voltage electrical equipment, electrical components, and edge materials. It is the * instrument in high-voltage testing.

2、 Product Structure

The iron core of the AC voltage withstand test device is a single frame type. The coil adopts a multi-layer tower structure with the same core cylinder. The primary low-voltage winding is wound on the iron core, and the secondary high-voltage winding is wound on the outside of the low-voltage winding. This coaxial arrangement reduces the coupling loss between the windings. The high-voltage silicon stack is packaged in a sleeve using a process, and the outer shell of the product is made into an octagonal structure that matches the core, resulting in an overall beautiful and elegant appearance.

3、 Working principle

1. The AC withstand voltage test device is a single-phase transformer with connection group number II. The working process of a single high-voltage test transformer is to connect the AC 220V (380V for 10KVA and above) voltage to the power control box (platform), and adjust the voltage from 0 to 200V (0 to 400V for 10KVA and above) to the primary winding of the test transformer through the self coupling voltage regulator (attached to the regulator for 50KVA and above) inside the power control box (platform). According to the principle of electromagnetic induction, the high voltage required for the test can be obtained in the high-voltage winding of the test transformer.

3KVA 5KVA/50KV power frequency withstand voltage test device
4、 Technical indicators

1. Environmental conditions for use

The ambient temperature shall not be higher than+40 ℃ and not lower than -20 ℃;

The relative humidity of the air is not greater than 90%;

Altitude not exceeding 3500 meters;

2. Working voltage

The input voltage of the power control box (unit) is AC 220V or 380V, and the relative error does not exceed ± 10%; (The specific voltage to be used is selected according to the specifications of the test transformer specified by the user)