Electrical distribution transformers are core power equipment that convert alternating voltage (or current) of one value to another at the same frequency, while enabling impedance transformation or phase adjustment. CHH Power offers a full range of distribution transformers—covering diverse types and applications—to support the entire power transmission and consumption chain. Below is a systematic breakdown of their core attributes.
1. Core Definition & Core Roles
A distribution transformer is a versatile electrical device that performs three key functions:
- Voltage transformation: Converts alternating voltage between different values (step-up or step-down) at the same frequency.
- Current/impedance adjustment: Alters alternating current magnitude and optimizes impedance matching for system compatibility.
- Isolation/phase adjustment: Provides electrical isolation between circuits and adjusts phase as needed for specific applications.
CHH Power’s transformers integrate these functions, with designs tailored to power generation, transmission, and end-user scenarios.
2. Critical Significance in Power Systems
Distribution transformers are indispensable for efficient, safe power supply—acting as “energy bridges” between power plants and end users:
2.1 Step-Up for Long-Distance Transmission
Power plants generate electricity at 3.15kV, 6.3kV, 10.5kV, or 15.75kV (economical for generators in terms of safety and manufacturing cost). To transmit power P=3UIcosφ over long distances:
- Higher voltage reduces line current (when P and cosφ are fixed), minimizing transmission line losses and saving conductive materials.
- CHH Power’s step-up transformers boost generator output to high voltages (up to 500kV, China’s maximum AC transmission voltage) for economical long-distance delivery.
2.2 Step-Down for End-User Applications
Upon reaching power-consuming areas, high voltage must be reduced to meet equipment requirements:
- Most civilian and commercial appliances use 220V (single-phase) or 380V (three-phase).
- Industrial motors may require 3kV or 6kV; low-voltage equipment uses 36V.
- CHH Power’s step-down transformers (installed in substations at all levels) precisely reduce voltage to match end-user needs.
3. Classification of CHH Power Distribution Transformers
Transformers are categorized by use, structure, core design, and phase count—all sharing the same basic principles and structures:
| Classification Criterion | Types | CHH Power Product Focus |
|---|---|---|
| By Use | Power transformers, distribution transformers, voltage-regulating transformers, instrument transformers, isolation transformers | Full range coverage, with distribution/voltage-regulating transformers as core products for commercial/industrial use |
| By Structure | Two-winding, three-winding, multi-winding, autotransformers | Two-winding (mainstream for general use) and autotransformers (for high-efficiency, compact scenarios) |
| By Core Structure | Core-type, shell-type | Core-type (widely used in power systems) and shell-type (for small, compact power supplies) |
| By Phase Count | Single-phase, three-phase, multi-phase | Three-phase (dominant for industrial/commercial grids) and single-phase (for residential/distributed loads) |
4. Basic Structure of CHH Power Distribution Transformers
All transformers consist of two core components: iron core (magnetic circuit) and coils (electrical circuit), with strict material and insulation standards:
4.1 Iron Core
- Role: Forms a closed magnetic circuit for electromagnetic induction, reducing energy loss.
- Material: Stacked 0.35–0.5mm silicon steel sheets, separated by insulating paint to minimize eddy current loss (from magnetic flux changes).
- Types: Core-type (CHH’s mainstream design) and shell-type (for specialized compact applications).
4.2 Coils (Windings)
- Primary Winding: Connected to the power supply, with turn count N₁.
- Secondary Winding: Connected to the load, with turn count N₂.
- Insulation Requirements: Strict insulation between windings, and between windings and the iron core (compliant with CHH’s Class H insulation standards for durability).
- CHH’s Winding Standards: Uniform, tight winding with no crossings or overlaps (ensures stable performance and long service life).
5. Core Functions of CHH Power Transformers
Beyond voltage transformation, transformers serve two critical roles:
- Impedance transformation: Matches load impedance to the power source, maximizing power transfer efficiency (key for industrial equipment and electronic products).
- Isolation: Separates the primary and secondary circuits, preventing electric shock hazards and reducing interference (critical for sensitive electronic equipment).
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