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XN-GEN Technical Support: A Comprehensive Guide to Selecting Diesel Generators

1. Criteria for Selecting a Diesel Generator

Performance and Quality Standards

Diesel generators are widely used in telecommunications, finance, healthcare, education, commerce, industrial enterprises, and residential areas as emergency backup power sources. They also serve as independent power solutions for military operations, outdoor activities, vehicles, and marine applications.

When selecting a diesel generator for communication purposes, it must meet the GB2820-1997 G3 or G4 standards and comply with the “Implementation Rules for Network Access Quality Certification of Communication Diesel Generators.” These rules define 24 performance indicators that a generator must meet. Additionally, it should pass rigorous quality inspections conducted by the national Communication Power Equipment Quality Supervision and Inspection Center.

For military communication applications, the generator must comply with the relevant GB2820-1997 standards, GJB military standards, and specific military department requirements under the “Quality Testing Standards for Communication Power Equipment.” The generator must undergo strict quality inspections from designated military organizations.

Key Factors to Consider When Choosing a Diesel Generator

Several essential factors influence the choice of a diesel generator:

1. Intended Use: Diesel generators can serve as primary power sources, backup power supplies, or emergency power solutions. The specific application determines the necessary features and performance criteria.
2. Load Capacity: Selecting the appropriate capacity depends on the expected load and fluctuation range. Single-unit capacity and backup unit capacity should be carefully calculated.
3. Environmental Conditions: Considerations include altitude, temperature, and climatic conditions that may impact performance.
4. Generator Type: The choice of generator model should align with operational requirements, efficiency, and durability.
5. Excitation System: Choosing between self-excited and separately excited generators impacts performance stability.
6. Automation Features: Depending on operational needs, selecting an automated system can enhance efficiency and reliability.

2. Diesel Generator Selection Standards

To ensure reliable operation, communication diesel generators must comply with 24 key performance indicators as outlined in the certification standards. Below are the essential requirements:

1. Exterior and Structural Requirements

• The generator’s dimensions, installation parameters, and connection points must conform to approved factory blueprints.
• Welding quality must be robust, with uniform weld seams free from defects such as cracks, porosity, or slag inclusion. Protective coatings should be smooth, without peeling or rust spots.
• Electrical installations must align with circuit diagrams, with all wire connections clearly marked and securely fastened.
• The generator must have a reliable grounding terminal.
• The nameplate must display complete and accurate information.

2. Insulation Resistance and Dielectric Strength

• Insulation Resistance: Independent electrical circuits should have insulation resistance greater than 2MΩ.
• Dielectric Strength: Electrical circuits must withstand an AC voltage test for 1 minute without breakdown or arcing:
  • For circuits below 100V, the test voltage is 750V.
  • For circuits 100V and above, the test voltage is 1440V.

3. Phase Sequence Requirements

• The control panel terminal phase sequence must follow a standard left-to-right or top-to-bottom order when viewed from the front.

4. Standby Readiness and Preheating

• The generator should include a heating system to ensure that engine oil and coolant temperatures remain above 15°C, facilitating rapid startup and immediate load handling.

5. Automatic Start and Stop Reliability

• The generator should feature an automatic startup and shutdown mechanism with high reliability, ensuring immediate power supply in emergencies and proper shutdown without operational failures.

By following these guidelines, users can select a high-quality diesel generator that meets industry standards and operational needs while ensuring optimal performance and longevity.