CHH Power’s dry-type power transformers feature four core discharge methods, with strict voltage, current, and temperature controls to ensure stable performance and long service life. Below is a systematic breakdown of discharge technologies, operational limits, and environmental adaptability—tailored to the company’s product design standards.
1. Core Discharge Methods & Application Scenarios
CHH Power’s dry-type power transformers adopt four discharge modes, each optimized for specific testing or operational needs:
| Discharge Method | Key Characteristics | Application |
|---|---|---|
| Constant Current Discharge | Maintains stable current output regardless of internal resistance changes | Primary method for discharge performance testing (ensures accurate data on capacity and voltage stability) |
| Constant Load Discharge | Load remains fixed during discharge | Preferred for lithium-ion dry-type transformers (adapts to dynamic internal resistance shifts during operation) |
| Pulse Discharge | Delivers short-duration, high-intensity current pulses | Specialized scenarios (e.g., emergency power supply for industrial equipment) |
| Constant Power Discharge | Maintains consistent power output; current adjusts with voltage changes | High-demand applications requiring stable power delivery (note: risk of current surges if voltage drops) |
Critical Protection for Transformer Banks
When discharging transformer banks, CHH Power equips all units with a dedicated protection board set to a low-voltage threshold. This prevents over-discharge failures by cutting off the circuit once the voltage falls below the safe limit.
2. Discharge Voltage Control Standards
Voltage regulation is critical to avoid over-discharge (a primary cause of transformer damage). CHH Power enforces the following limits:
Single Transformer
- Standard discharge cutoff voltage: 2.75V (room temperature, normal discharge rate).
- Low-temperature/high-rate discharge cutoff voltage: 2.5V (compensates for increased internal resistance in extreme conditions).
Transformer Banks
- Recommended discharge cutoff voltage: n·3V (where
n= number of transformers in the bank). - Over-discharge definition: When the discharge voltage drops below the specified cutoff (triggers immediate protection board activation).
3. Impact of Discharge Current on Performance
Discharge current directly affects transformer capacity and lifespan—CHH Power provides clear guidelines to balance performance and durability:
- High-Current Effects:
- Elevated current reduces the discharge voltage platform and overall discharge capacity.
- For constant power discharge: A falling voltage platform forces current to rise; exceeding 2C (twice the rated capacity current) causes significant capacity degradation.
- Recommended Current Limit:
- Standard dry-type transformers: Discharge within 2C (enforced by CHH Power’s design specifications).
- Exception: Power-type dry-type transformers (manufactured via specialized processes) support higher current discharge for short-duration peak loads.
4. Operating Temperature Range & Performance Adaptability
CHH Power’s dry-type transformers are engineered for broad temperature adaptability, with material and design variations for extreme environments:
Temperature Ranges
- General-purpose lithium-ion dry-type transformers: -25°C to +55°C (optimal for most industrial and commercial applications).
- Extreme-environment models: -40°C to +60°C (customized for harsh conditions like high-altitude areas or desert climates).
Temperature Impact on Discharge Performance
| Temperature Condition | Performance Behavior | Design Adaptations for Extreme Models |
|---|---|---|
| Low Temperature (-40°C to -25°C) | – Internal resistance increases sharply | – High-conductivity electrolyte materials |
| High Temperature (+45°C to +60°C) | – Discharge capacity is slightly higher than room temperature (negligible difference) | – Heat-resistant separator materials |
Cost Consideration
Extreme-temperature (low/high) transformers require specialized materials and engineering, so their production costs are higher than general-purpose models—CHH Power offers these as custom solutions for targeted applications.
Key Operational Recommendations from CHH Power
- Adhere to the 2C discharge current limit for standard models to maximize lifespan.
- Use the correct cutoff voltage for single units or banks (refer to product nameplates).
- For extreme-temperature operations, select CHH Power’s custom low/high-temperature models to avoid performance loss or damage.
- Regularly inspect the protection board during maintenance to ensure over-discharge protection functions normally.
CHH Power’s discharge performance standards are designed to balance reliability, efficiency, and adaptability—ensuring our dry-type power transformers excel in diverse industrial and commercial power systems.
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