VLF Cable Tester

Hipot Cable Testing and Analysis

Precisely detect hidden faults in cables and high-voltage equipment, extend equipment lifespan, and ensure safe and stable operation of your power system

With the rapid development of the power industry, power cables play a crucial role in the stability and safety of running power systems. The demand for cable testing equipment is steadily increasing. VLF(Very Low Frequency) cable tester is a specialized instrument designed to assess the insulation performance of power cables, motor windings, and high-voltage equipment. By operating at low frequencies, it can effectively detect defects that may not be easily identified with high-frequency signals, making it essential for the maintenance and fault detection of power systems.

Hipot Cable Tester

Hipot Cable Tester is used to verify the integrity of the insulation in medium and high voltage (MV and HV) cables. This technique is particularly advantageous for field testing due to the portability of VLF equipment, which is typically smaller and lighter compared to traditional high-frequency test equipment. The inherent capacitance of power cables requires charging when energized, and since VLF systems operate at frequencies below 1 Hz, they consume significantly less power than systems using higher frequencies. This makes VLF testing an efficient and cost-effective approach, especially for testing modern polymer-insulated cables such as XLPE and EPR.

VLF Hipot Tester

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DC Hipot Tester

AC Hipot Tester

AC Resonance Test System

Cable Tan Delta Test

During long-term operation, power cables may experience insulation aging, damage, and other issues due to various factors. These problems can lead to dielectric loss, which affects the normal functioning of the cable. The dielectric loss testing in power cables is essential.

Cable tan delta tester is a effective and reliable test method to measure of the dissipation factor of HV cables

Hipot Tester

VLF Hipot Tester

Resonance Test System

Advanced VLF tester by application

VLF testers are widely used in power transmission and distribution networks for testing medium- and high-voltage cables, ensuring grid reliability and safe operation. They play a crucial role in renewable energy systems, industrial plants, electrical system and transportation networks like railways and subways by verifying the insulation integrity of critical infrastructure. Additionally, they are essential in factory testing for cable manufacturers and maintaining underground cables in airports, mining, and utilities

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Product Details

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HOT

Why do people use VLF Hipot Tester?

VLF hipot testers use a sine wave voltage output that typically ranges from 0.1 Hz to 0.01 Hz. The frequency of the VLF output is important because it affects the test voltage level that can be applied to the insulation without causing damage. At lower frequencies, higher voltages can be applied without damaging the insulation. This is because the low frequency allows the voltage to penetrate the insulation and charge the capacitance of the system, rather than simply causing surface breakdown.

What is the principle of AC resonance test system?

The principle of AC resonance test system is based on the resonant circuit theory. In this test, an AC source is used to excite the system with a specific frequency, and the current response of the system is measured. The test system consists of a variable frequency AC source, a reactor or inductor, a capacitor, and a voltage and current measurement system.

what is withstand voltage test ？

A withstand voltage test is a type of high voltage test that is performed on electrical equipment or systems to assess their ability to withstand a specified voltage level for a certain period of time without breakdown or failure.

The test involves applying a high voltage to the equipment or system under test, typically at a level higher than its rated voltage, for a specified duration. The voltage level and test duration are determined by relevant standards and the specifications of the equipment being tested.