Stable power supply is the cornerstone of industrial production and people's livelihood security. As the "heart" of the power system, the quality of transformers directly determines the safety and efficiency of power grid operation. As one of the leading dry type transformer manufacturers, Jinshanmen Electric has been deeply engaged in the transformer field for decades, adhering to the iron rule of "zero-defect delivery". Through five core factory tests, we inject extremely reliable quality genes into every dry type transformer, whether it is a 500 kva dry type transformer or a 1000 kva dry type transformer, ensuring users access to safe and reliable electricity.
1. Insulation Resistance Test: Building a "Firewall" for Power
Insulation performance is the lifeline of a transformer, directly related to operational safety. Jinshanmen uses a 2500V professional megohmmeter to accurately test the insulation performance between the transformer windings, iron core and shell. We strictly control the insulation resistance value - it must be ≥100MΩ at room temperature (the standard is dynamically adjusted according to the product capacity), and the absorption ratio must be ≥1.3. This fundamentally eliminates the risks of leakage and insulation breakdown during operation, building the first "firewall" for power transmission, applicable to all our products including 500 kva dry type transformer and 1000 kva dry type transformer.
2. Turn Ratio and Connection Group Label Test: Precisely Controlling the Voltage "Conversion Valve"
The accuracy of voltage conversion directly affects the stable operation of downstream equipment. Jinshanmen uses professional testing equipment to strictly verify the turn ratio error and connection group label of transformers: ensuring the turn ratio error is ≤±0.5%, fully complying with design standards; at the same time, accurately confirming that the connection group label (such as the commonly used Dyn11) is consistent with the design. This ensures accurate voltage conversion, avoiding equipment damage and power failures caused by label errors or turn ratio deviations, which is crucial for both 500 kva and 1000 kva dry type transformers.
3. Load Loss and No-Load Loss Test: Practicing Energy-Saving "Hard Standards"
Under the dual-carbon goal, energy-saving performance has become the core competitiveness of transformers. Jinshanmen conducts dual tests of load loss and no-load loss on each transformer: testing load loss under rated current and monitoring no-load loss under rated voltage. We ensure both indicators are ≤ design values and fully comply with GB 20052 Class 1 energy efficiency standards. Through extreme energy consumption control, we help users reduce operating costs and contribute to green and low-carbon development. This energy-saving advantage is fully reflected in our 500 kva, 1000 kva and other specifications of dry type transformers.
4. Short-Circuit Withstand Test: Tempering "Compressibility" in Extreme Working Conditions
Sudden short circuit is the ultimate test of transformer mechanical strength and insulation stability. Jinshanmen conducts rigorous tests on transformers by simulating real short-circuit conditions, requiring no deformation or displacement of windings, no damage to the insulation layer, and stable core parameters after the test. Jinshanmen transformers that have passed this test can maintain structural integrity even in extreme power failures, buying valuable time for power grid fault investigation and recovery. This performance is essential for high-power products like 1000 kva dry type transformer.
5. Partial Discharge Test: Detecting Internal "Invisible Hidden Dangers"
Tiny defects inside the windings (such as air bubbles and impurities) can cause partial discharge, accelerate insulation aging, and become "invisible killers" for long-term operation. Jinshanmen uses high-precision partial discharge testing equipment to test transformers under rated voltage, ensuring the partial discharge amount is ≤50pC. This accurately detects internal insulation defects, fundamentally avoiding insulation aging and damage, extending the service life of transformers, and ensuring long-term stable operation for both 500 kva and 1000 kva dry type transformers.
From insulation performance to voltage conversion, from energy consumption to extreme pressure resistance, Jinshanmen takes the five core tests as the benchmark, integrating quality control throughout the entire production process. As professional dry type transformer manufacturers, every Jinshanmen dry type transformer delivered, whether 500 kva or 1000 kva, is the crystallization of "strict standards + professional technology". Choosing Jinshanmen means choosing reliable, energy-saving and safe power guarantee, making every kilowatt of electricity convey quality and peace of mind.