Overview of Understanding on Product Selection of Deyan Electric

Deyan Electric specializes in 10～35kV high and low voltage complete power distribution equipment. Its core products cover ring main units, gas-insulated switchgears, high-voltage switch cabinets, box-type substations, prefabricated cabins, photovoltaic step-up box substations, photovoltaic grid-connected cabinets and more, serving power distribution projects such as industrial & commercial power supply, municipal infrastructure, photovoltaic new energy and park power supply. Combined with the company's actual manufacturing capacity, the understanding of product selection is sorted out as follows:

I. Primary Selection Principle: Take On-site Operating Conditions as the Basis for Model Selection

The model selection work shall first clarify the project application scenarios, and match mature existing cabinet models with power supply demands. Scheme design shall not go beyond the scope of mass-produced products.

1. Photovoltaic and distributed new energy projects: Photovoltaic step-up box substations and photovoltaic grid-connected cabinets are selected conventionally. For outdoor centralized layout and positions with limited installation space, gas-insulated ring main units and standard switching stations are configured to meet basic grid-connected power supply requirements.

2. Urban supporting facilities, commercial parks and factory internal power distribution: Compact gas-insulated switchgears and fully insulated ring main units are prioritized for narrow power distribution rooms and enclosed spaces such as basements. Air-insulated high-voltage complete switchgears are adopted for conventional indoor power distribution stations with sufficient space.

3. Wild construction sites and scattered outdoor power supply points: Integrated box substations and standard prefabricated cabins are preferred. Relying on factory integral prefabrication and fast on-site installation, the on-site construction period can be shortened.

II. Distinction of Core Technical Selection: Insulation Form, Land Occupation and Environmental Adaptability

The company's product line consists of two mature technical routes: air-insulated equipment and gas-insulated equipment, which serve as the critical dividing line for model selection.

1. Installation space conditions: Gas-insulated switchgears with smaller floor area and fully insulated cabinets are selected for confined indoor power distribution rooms and underground power distribution spaces; air-insulated switchgears can be adopted for sites with ample space and strict budget control to cut procurement costs.

2. External environmental conditions: Fully enclosed gas-insulated equipment is prioritized for outdoor, high-humidity and dusty working conditions to reduce hidden insulation risks caused by condensation and external environments. Air-insulated cabinets can meet operation requirements for dry indoor power distribution sites with convenient maintenance.

3. Rigorous matching of electrical parameters: Cabinet models shall be selected in strict accordance with system rated voltage, rated current, short-circuit breaking current and other primary parameters to ensure reasonable coordination of protection parameters between upper and lower switches and satisfy mandatory specifications for safe operation of power distribution systems.

III. Comprehensive Trade-off Between Cost and Operation & Maintenance

Model selection shall not simply compare the initial procurement price of equipment; later maintenance difficulty and versatility of spare parts must be comprehensively considered.

1. Station projects with stable load and dedicated maintenance personnel: Economical standard air-insulated complete equipment can be selected to control upfront investment.

2. Wild sites with inconvenient inspections: Enclosed gas-insulated equipment is prioritized to reduce daily maintenance frequency.

3. Standard mass-produced cabinet models are preferred, with sufficient stocked standardized parts to facilitate spare parts procurement and equipment maintenance. Non-standard customized schemes will only be evaluated for special size or structural demands, with full assessment of increased cycle time and costs brought by customization.

IV. Control of Compliance and Delivery Scope

1. During model selection, verify the type test reports and qualification documents of corresponding cabinet models to ensure the equipment complies with industrial standards and meets project acceptance requirements.

2. The selection scope is limited to stably mass-producible products of the company; special structures and configurations beyond manufacturing capacity will not be included in schemes.

3. Model selection belongs to the overall matching of complete power distribution schemes. While confirming equipment models, coordinate the planning of primary main wiring, cabinet layout and basic secondary wiring schemes to guarantee mutual compatibility of all complete equipment.

Conclusion

Product selection of Deyan Electric is a systematic equipment matching work carried out around project load capacity, installation site, environmental conditions, budget and delivery cycle. The core thinking is as follows: Based on actual on-site working conditions, select insulation schemes and equipment models within the scope of the company's mature mass-produced products, balance operational safety, project implementability, maintenance convenience and investment rationality, and build reliable and compliant basic power distribution solutions supported by existing mature complete products.