2000kva oil-immersed transformer

　　Comprehensive Analysis of 2000kVA Oil-Immersed Transformers

　　I. Core Parameters and Performance Indicators

　　Rated Capacity and Voltage

　　Rated capacity: 2000kVA, suitable for medium-to-large industrial facilities, commercial buildings, and renewable energy generation scenarios.

　　Typical voltage configuration: High-voltage side 10kV/low-voltage side 0.4kV, supporting ±5% or ±2×2.5% no-load tap changers to accommodate grid voltage fluctuations.

　　Loss and Efficiency

　　No-load loss: As low as 1,225W for S20 series, approximately 30% lower than S11 series, primarily due to high-permeability silicon steel core materials.

　　Load loss: Approximately 14,640W for 2000kVA models, utilizing oxygen-free copper windings to reduce resistive losses.

　　Energy efficiency grade: Compliant with GB20052 Grade II standards, reducing total losses by 25% compared to traditional models, with annual electricity savings of tens of thousands of kWh.

　　Impedance and Overload Capacity

　　Short-circuit impedance typically ranges from 4.5% to 6%, ensuring current-limiting capability during faults.

　　Short-term overload capacity: 1.3× rated capacity for 120 minutes or 1.6× for 45 minutes, meeting sudden load demands.

　　II. Structural Design and Technical Features

　　Fully Sealed Corrugated Tank

　　Adopts corrugated fins for elastic compensation of oil volume changes, enabling maintenance-free operation and virtually eliminating oil leakage.

　　Tank pressure resistance: 50kPa for 5 minutes without deformation, suitable for harsh environments.

　　Cooling and Insulation System

　　Natural cooling (ONAN) or forced-air cooling (ONAF) designs ensure oil temperature rise does not exceed 60K.

　　Insulation grade: F-class (155℃), utilizing heat-resistant transformer oil and paperboard composite insulation, with partial discharge ≤5pC.

　　Protection and Monitoring Devices

　　Equipped with gas relays, pressure relief valves, thermometers, and oil level indicators for multi-layer protection.

　　Optional smart monitoring modules enable real-time cloud uploads of oil temperature, load data, etc.

　　III. Application Scenarios and Selection Guidelines

　　Typical Application Fields

　　Industrial manufacturing: Continuous production industries like steel and chemicals requiring high-reliability power supply.

　　Renewable energy generation: Step-up systems for wind and photovoltaic power plants, matching inverter outputs.

　　Commercial buildings: Grade I load supply for large shopping malls, data centers, etc.

　　Key Selection Factors

　　Load characteristics: Prioritize S20 series for fluctuating loads to minimize no-load losses.

　　Environmental conditions: Derate capacity by ~10% per 1,000m elevation increase in high-altitude regions.

　　Energy efficiency requirements: Grade II models cost 5%–10% more initially but recoup the difference within 5 years.

　　IV. Market Pricing and Supplier Analysis

　　Price Ranges

　　Basic models (e.g., S11-M-2000/10): Approximately RMB 88,000–128,000, suitable for general-purpose loads.

　　High-efficiency models (e.g., S20-M-2000/10-NX2): Approximately RMB 185,000–204,000, ideal for energy-sensitive projects.

　　Custom models (e.g., amorphous alloy cores): 20%–30% premium, reducing no-load losses by an additional 60%.

　　Leading Suppliers

　　Jiangsu Juli Power Equipment Co., Ltd.: Offers full S20 series specifications with custom design support.

　　Shandong Jiaxing Electric Co., Ltd.: Specializes in Grade II energy-efficient models with mature corrugated tank technology.

　　Zhejiang Zhaolun New Energy Technology Co., Ltd.: Focuses on PV-配套 (photovoltaic-matched) transformers, providing dual 10kV/20kV voltage options.

　　V. Maintenance and Fault Handling Guide

　　Routine Inspection Items

　　Oil level and quality: Monthly checks of oil level gauges; oil transparency ≥70%, water content ≤20ppm.

　　Temperature monitoring: Top oil temperature ≤85℃, temperature rise limit 60K.

　　Sound diagnosis: Normal operation produces uniform "humming"; abnormal noises may indicate winding looseness or core grounding issues.

　　Common Fault Solutions

　　Oil leakage: Tighten bolts or replace oil-resistant rubber seals; conduct sealing tests post-repair.

　　Excessive oil temperature: Inspect for radiator blockages; clean fins if necessary.

　　Light gas alarm: Immediately analyze gas samples; reset relays for air presence; power down for inspection if combustible gases are detected.

　　VI. Technological Development Trends

　　Material Innovations

　　Expanded adoption of amorphous alloy cores, reducing no-load losses below 0.8kW (for 2000kVA models).

　　Replacement of mineral oil with natural ester (vegetable oil) for enhanced fire resistance and biodegradability.

　　Smart Upgrades

　　Integration of IoT sensors for remote diagnostics and predictive maintenance.

　　Deployment of digital twin technology to simulate full lifecycle transformer conditions.

　　Environmental Compliance

　　Adherence to RoHS directives, banning harmful substances like PCBs.

　　Mandatory recycling rates ≥95% for retired transformers, with separate metal and oil recovery.