Key Insights
DC leakage testing measures the flow of leakage current across insulators, offering deeper insights into defects such as cracks, moisture, and insulation deterioration. With adjustable voltage settings, DC leakage tests are more sensitive than traditional megohmmeter tests, providing accurate indications of localized failures, especially in porcelain insulation, interlayer fractures, and insulation oil degradation.
On the other hand, DC withstand voltage tests assess the dielectric strength of insulation materials. By subjecting insulation to high voltage, typically 2-2.5 times the operational voltage, this test highlights vulnerabilities that could lead to operational breakdowns. The test is particularly useful for high-voltage motors, capacitors, lightning arresters, and other critical electrical components. A key advantage of DC withstand voltage testing is its ability to detect defects early, with minimal damage to the insulation.
Technology and Methodology
The DC leakage and withstand voltage tests are conducted using Wrindu’s advanced DC high-voltage generators, which use PWM high-frequency pulse width modulation technology. This method ensures stable high voltage with minimal pulsation, offering accurate and reliable results.
While both tests use high voltage, DC withstand voltage tests are typically destructive, identifying specific defects by measuring leakage current behavior as voltage increases. A critical aspect of the testing process is monitoring leakage current. If an anomaly occurs—such as a rapid increase in leakage current—further adjustments, including increasing voltage or extending test duration, can help pinpoint the issue.
Testing Protocol and Precautions
During the DC withstand voltage test, Wrindu emphasizes safety with a well-defined protocol. High-voltage equipment must be grounded properly, and leakage current must be measured using high-precision microammeters to eliminate stray current influence. Temperature and humidity control are essential factors, as they can significantly impact the accuracy of test results. The test should be conducted in a controlled environment, ideally between 30-80°C, to ensure reliable data.
Applications in Industry
The DC withstand voltage test is especially valuable for preventive maintenance in industries like power generation, where high-voltage equipment such as transformers and generators require regular testing to avoid unanticipated failures. However, Wrindu cautions against using DC tests on cross-linked polyethylene (XLPE) cables, due to the potential risk of accelerated aging and breakdown under DC voltage.
For safer and more effective operation, Wrindu recommends performing the test with trained professionals and under the supervision of qualified personnel. Comprehensive test results can help operators identify necessary maintenance actions—such as oil changes or insulation repairs—before issues escalate into costly breakdowns.
About Wrindu
Wrindu is an innovative leader in the field of electrical testing equipment, specializing in high-precision solutions for power systems. Wrindu’s products are trusted by industries worldwide to ensure the reliability, safety, and performance of electrical infrastructure.
For more information about Wrindu’s DC Leakage and DC Withstand Voltage Testing Solutions, visit official website: www.wrindu.com / www.hvtesters.com
Media Contact
Company Name: Rui Du Mechanical and Electrical (Shanghai) Co., Ltd.
Email: Send Email
Phone: 13661908522
Address:No.500 Jianyun Road, Pudong New Area
City: Shanghai
Country: China
Website: https://www.wrindu.com/
