1. Scientifically divide the equipment testing cycle and formulate testing plans at different levels

According to the regulations, the test frequency is divided based on voltage levels and equipment importance. Main transformers, high-voltage cables, and switchgear cabinets are designated as critical equipment, with their testing cycles shortened. Auxiliary power distribution equipment has its testing cycle moderately extended. Relying on equipment such as the HZVLF ultra-low frequency and transformation ratio tester, the regular testing of equipment with accelerated insulation deterioration is replaced by condition-based maintenance, reducing unnecessary power outages for testing.

II. Optimize the combination of experimental projects and consolidate on-site testing in a one-stop manner

Coordinate the power outage window period to simultaneously conduct ultra-low frequency voltage withstand test, dielectric loss test, partial discharge test, transformer ratio test, and oil test, completing multiple periodic tests in one power outage. Select multi-functional integrated instruments, where one device can handle multiple tests such as voltage withstand, dielectric loss, and partial discharge, reducing the number of equipment brought to the site and shortening the on-site construction duration.

III. Establish digital ledgers based on inspection data to facilitate operation and maintenance

Data from each periodic test is categorized and archived, establishing a comprehensive equipment lifecycle ledger. By comparing changes in test parameters over the years, potential insulation hazards can be predicted. The storage and printing functions of instruments are utilized to retain original reports, reducing the workload of paper-based data organization and enabling quick screening of abnormal equipment for early maintenance scheduling.

IV. Rationally allocate testing instruments to reduce the cost of outsourced testing

We have equipped ourselves with proprietary testing equipment such as ultra-low frequency, high current, and oil content detection devices, and have implemented regular periodic self-inspection. For special and challenging projects, we resort to a small amount of outsourcing. The Baoding Huazheng integrated portable instrument facilitates field inspections, shortens equipment transfer time, and avoids additional expenses incurred by repeated equipment rental.

5. Standardize on-site operation procedures to enhance the speed of on-site testing

Unify wiring specifications, test operation procedures, and safety control rules, and standardize the work of test personnel. Leverage the automatic voltage boosting, automatic calculation, and automatic evaluation functions of the instrument to eliminate manual data calculation steps and significantly reduce the testing time for individual equipment.

VI. Rectify hidden risks within the closed loop to extend the equipment operation and maintenance cycle from the source

Defects found during periodic testing are graded and archived. Minor defects are immediately eliminated, while major defects are scheduled for maintenance during power outages. After the hidden dangers are closed-looped, retesting and verification are conducted to slow down equipment aging, extend the interval between subsequent tests, and continuously reduce the overall operational and maintenance costs throughout the entire cycle.