"Increaser", also known as "large current booster", is a high-current booster and high-current generator device for transformer testing equipment. The high-current booster is suitable for supplying primary current when verifying current transformers. Power supply or as other 50HZ single-phase power supply equipment. The current booster for transformer verification is suitable for power users such as power testing, power metering, and power maintenance. There are many types of current booster, how to choose, the following are respectively introduced: 1. Model: GYSL-500A Capacity (3KVA) Power supply: 220V, integral type. 2. Model: GYSL-1000A Capacity (6KVA) Power supply: 220V, integral type. 3. Model: GYSL-1500A Capacity (9KVA) Power supply: 220V, integral type. 4. Model: GYSL-2000A Capacity (12KVA) Power supply: 380V, integral. 5. Model: GYSL-2500A Capacity (15KVA) Power supply: 380V, split type. 6. Model: GYSL-5000A Capacity (30KVA) Power supply: 380V, split type. 7. Model: GYSL-10000A Capacity (60KVA) Power supply: 380V, split type.