Utility

——Selection Guidelines, Safety Specifications, and Common Fault Handling

I. Product Selection Guide

This manual is applicable to the installation and maintenance guidance for oil-immersed transformers. Oil-immersed transformers are widely used in outdoor substations, industrial parks, and similar scenarios due to their excellent heat dissipation performance and overload capacity, with the insulating oil serving both insulation and cooling functions. If the project involves grid connection of renewable energy, special matching with photovoltaic transformers is also required. As a supplier and manufacturer with years of industry experience, we recommend that users clarify the operating environment and capacity requirements during the selection phase, and refer to the customized solutions provided by our factory when necessary. Special attention should be paid to high voltage transformers, where insulation levels and withstand voltage ratings must be strictly verified.

II. Installation and Safety Specifications

During installation, oil-immersed transformers must be equipped with a complete oil containment pit and pressure relief devices to prevent insulating oil leakage in case of accidents. It is also essential to ensure that accessories such as radiators and gas relays are installed in accordance with design requirements. For the highly integrated box-type substation, if it is configured with an oil-immersed transformer, the foundation level must be ensured during on-site hoisting, and circuit commissioning shall be completed strictly in accordance with the wiring diagram. All terminals must be securely fastened, and the grounding system must meet the design requirements. In terms of safety, operators must strictly follow power-off and voltage verification procedures. Especially before performing a withstand voltage test on high voltage transformers, proper wiring must be confirmed.

III. Operation, Maintenance, and Common Fault Handling

During routine inspections, special attention should be paid to whether the oil level of the oil-immersed transformer is normal, whether there is any oil leakage, and whether the silica gel in the breather has become ineffective. For photovoltaic transformers applied in photovoltaic power stations, particular attention should be given to the impact of inrush current on protection devices. Common faults such as excessive temperature rise in the transformer should first be addressed by checking whether the load rate exceeds the limit. If the heavy gas protection operates, the gas composition should be analyzed to determine whether an internal fault has occurred. All maintenance operations shall be documented. As a professional manufacturer and factory, our company can provide long-term spare parts support and remote technical guidance.