Oil Immersed OLTC Power Transformer Control System

1. Voltage Quality: Core Significance and Grid Challenges

(1) Key Impact of Voltage Variation

• Excessive voltage deviation (higher or lower than the allowable range) reduces the efficiency of motors, transformers, and electronic equipment by 10–20%, accelerates insulation aging, and shortens service life by 30% or more.
• For precision industrial equipment (e.g., CNC machines, electronic sensors), unstable voltage causes operational errors and product quality defects.

(2) Grid Constraints Leading to Voltage Fluctuations

• Insufficient Reserve Capacity: Power supply systems with small reserve capacity struggle to adapt to sudden load changes (e.g., peak industrial electricity use), leading to significant voltage drops.
• Weak Grid Structure: Underdeveloped regional power grids (e.g., rural areas) have poor voltage regulation capabilities, making voltage variation highly sensitive to load fluctuations.

(3) OLTC: Critical Measure for Voltage Regulation

2. Current Pain Points of OLTC Distribution Transformer Regulation

(1) Manual Adjustment Defects

• Many OLTC oil-immersed transformers still rely on manual tap adjustment. Improper operation, human error, and delayed response to load changes lead to voltage deviation, failing to meet real-time voltage regulation needs.
• Manual adjustment cannot keep up with rapid load fluctuations (e.g., sudden startup of large industrial motors), resulting in prolonged voltage instability.

(2) Domestic Automatic Controller Shortcomings

• Low Intelligence: Lack of automatic load and voltage monitoring, requiring manual parameter setting and adjustment.
• Poor Measurement Accuracy: Voltage and current measurement errors exceed 1%, leading to incorrect tap switching and unstable voltage output.
• Low Reliability: Frequent failures (e.g., sensor malfunctions, circuit board damage) due to poor component quality, disrupting normal voltage regulation.

(3) Imported Automatic Controller Limitations

• Language Barrier: Parameters and specifications are described in foreign languages, increasing operational and maintenance difficulty for on-site staff (most of whom lack professional foreign language skills).
• Outdated Display: Uses nixie tube displays with limited information and poor readability, making it hard to monitor real-time status (e.g., tap position, voltage value) and troubleshoot faults.
• Poor Adaptability: Long-term idle use due to incompatible grid parameters or complex operation, failing to contribute to voltage quality improvement.

3. CHH Power’s Intelligent OLTC Distribution Transformer Solution

(1) Core Advantages of CHH Power’s Intelligent Controller

• High Intelligence: Equipped with AI-based load and voltage prediction algorithms, automatically monitors grid voltage, load current, and power factor in real time. Taps are switched proactively (response time <1s) to stabilize voltage before deviations occur.
• High Measurement Accuracy: Adopts high-precision AD sampling modules (measurement error ≤0.2%), ensuring accurate acquisition of voltage and current data, and precise tap positioning.
• User-Friendly Design:
  • Full Chinese operation interface (with optional multi-language switching) and 7-inch color LCD touch screen, clearly displaying tap position, voltage/current values, fault codes, and operation logs.
  • Simplified operation steps, supporting one-key automatic regulation and manual emergency adjustment, reducing training costs for on-site staff.
• High Reliability: Uses industrial-grade components (e.g., imported sensors, military-grade circuit boards) with a mean time between failures (MTBF) >50,000 hours. Equipped with over-temperature, over-current, and short-circuit protection functions to avoid controller damage.

(2) Optimized OLTC Transformer Integration

• CHH Power’s OLTC oil-immersed transformers (e.g., S11-OLTC series) integrate the intelligent controller as a standard configuration, ensuring seamless matching between the transformer and controller.
• Supports remote monitoring and control via 4G/5G or Ethernet, enabling on-site staff to adjust parameters, query status, and troubleshoot faults through a mobile app or PC terminal—reducing on-site maintenance workload by 60%.

(3) Application Effect