Technical Solution: RW Series Vacuum Pressure Impregnation (VPI) Dry-Type Transformers

07/04/2025

Technical Solution: RW Series Vacuum Pressure Impregnation (VPI) Dry-Type Transformers

I. Core Technological Innovations

  1. Defect-Free Insulation System
    • Utilizes Vacuum Pressure Impregnation (VPI) process to cast high-density epoxy resin, achieving void-free solidified insulation.
    • Partial discharge levels stably controlled at ​<10 pC​ (IEC 60076-11 standard).
    • Insulation thermal class reaches ​Class H (180°C), with insulation performance degradation rate ​≤5%​ throughout the lifespan.
  2. Robust Environmental Adaptability Structure
    • Integrated casting and sealing technology, achieving ​IP54 protection​ (resists persistent dust ingress and water splashing from all directions).
    • Flame-retardant grade F1​ (per GB/T 2207 standard testing, no sustained combustion under 900°C open flame).
    • Wide operating temperature range: ​-25°C to +40°C​ (no derating required in areas at ​≤1000m altitude).
  3. Energy Efficiency Optimization Design
    • ​≥15% reduction**​ in no-load losses for SCBH15/SCB14 series compared to GB 20052 energy efficiency standard.
    • Measured data (1000kVA): No-load loss ​≤0.40kW, Load loss ​≤7.8kW.
    • Dynamic load loss optimization technology, achieving efficiency ​≥98.5%​ within the 35%~100% load range.
  4. Intelligent Maintenance System
    • Embedded ​PT100 platinum resistors in windings​ (IEC 60751 Class A accuracy, temperature measurement error ​±1°C).
    • Supports ​Modbus RTU/TCP protocols. Enables via IoT gateway:
      • Real-time winding hot-spot temperature monitoring.
      • Three-phase unbalance analysis.
      • Dynamic load-rate energy efficiency assessment.

II. Scenario-Based Application Advantages

Application Scenario

Core Problem Solved

Technical Implementation Path

General Industry

Metal dust erosion; Frequent equipment starts/stops

IP54 housing seal + VPI pollution-resistant structure

Commercial Complexes

Stringent fire codes; Compact space

F1 flame-retardant grade + Compact design (28% footprint reduction)

Data Centers

Harmonic pollution (THDi ​≤8%); Require 7×24 stable power

Anti-harmonic magnetic circuit design + ​±2°C​ temperature control accuracy

III. Life Cycle Cost Optimization

Parameter

Oil-Immersed Transformer

This Solution

Benefit Comparison

Maintenance Cycle

Every 2 years

Maintenance-free

Saves ​¥40k/year​ in maintenance

Failure Rate

0.8 per 1000 units/year

0.2 per 1000 units/year

60% reduction​ in downtime losses

Residual Value (20 yrs)

30%

55%

25% increase​ in asset value

Total Cost of Ownership

Benchmark

30% lower

 

(Validated by TCO Model)

     

IV. Engineering Validation Data

  • Accelerated Aging Test:​ Continuous operation for ​5000 hours at 40°C/85% RH; Insulation resistance maintained ​≥1000 MΩ.
  • Seismic Performance:​ Passed ​Class II seismic test​ per GB/T 13540 standard (horizontal acceleration ​0.3g).
  • Noise Control:​ ​≤55 dB(A)​ noise level during operation at ​1000kVA load​ (measured at ​1m distance).
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