In the whole process of power generation, transmission, distribution and use of the power system, voltage stability is directly related to equipment safety and power quality. The regulating transformer (voltage regulating transformer) is the "precision control center" to achieve this goal. Unlike ordinary transformers, which only do voltage conversion, it can automatically or manually adjust the output voltage in real time according to power grid fluctuations and load changes to ensure its stable operation within the qualified range. Relying on deep technical accumulation, Kechang Electric analyzes its core technology and selection strategy for you.
Core values: Why are they indispensable?
The essence of regulating transformers lies in "precise control", which mainly solves four pain points:
Equipment safety guards
The voltage of the power grid fluctuates with load and line loss. Over/undervoltage will directly damage expensive equipment such as precision machine tools and servers. Adjusting the transformer can compensate in real time and lock the output voltage.
Energy efficiency optimization expert
Stable voltage helps to improve the power factor, reduce reactive power loss, reduce the energy consumption of the system and the transformer itself, and achieve economical operation.
Power supply reliability guarantee
In view of the low voltage at the end of a long line or in remote areas, adjusting the transformer can raise the voltage level to ensure the normal start-up and efficient operation of the client equipment.
Flexible adaptation
It support manual, automatic and remote control, and seamless access to smart grids and energy management systems.
Brief analysis of technical principles
The principle is based on the law of electromagnetic induction: U1/U2 ≈N1/N2 (voltage ratio≈ turns ratio).
Core operation: Change the effective number of turns (N1) of the high-voltage winding to change the variable ratio.
Implementation method: Set up multiple taps in the high-voltage winding, switch gears through the tap switch, and change the number of turns on the high-voltage side equivalently to offset the fluctuations in the input voltage and maintain the stability of the output voltage (U2).
Two key technology types
| Types | Features | Advantages |
|
Non-excitation voltage regulation (power failure voltage regulation) |
The structure is simple and the cost is low, but it must be operated in a power-off state. |
Seasonal voltage adjustment or long-term operation mode changes, scenarios where frequent operation is not required (the range is usually ±5%). |
|
On-load voltage regulation (with load voltage regulation) |
The transformer can be adjusted smoothly when it is charged, without interrupting the power supply. The structure is complex and equipped with a transition resistor to limit the circulation. |
Fast response and high accuracy are the core of realizing automatic voltage control (AVC). |
Kechang solution: Our SZ11-M and other on-load voltage regulating series products have passed all tests of the National Electrical Product Quality Inspection and Testing Center, with reliable operation and accurate voltage regulation.
Scientific selection guide
The selection needs to consider the following elements comprehensively:
Demand matching
frequent voltage fluctuations → choose on-load voltage regulation; long-term stability only requires fine-tuning→ choose non-excitation voltage regulation.
Parameter definition
clarify the voltage regulation range (such as±5%,±2×2.5%) And system voltage/capacity level.
Intelligent upgrade
Do you need RS485 communication, access to SCADA, or implement AVC functions? Kechang can provide solutions for integrated intelligent terminals.
Quality assurance
The tap switch is the core moving part, and the quality determines the life span. Choosing Kechang Electric (with ISO9001, 56 patents and complete type test reports) is the cornerstone to ensure long-term stable operation.
Core composition
In addition to conventional iron cores, windings, fuel tanks and other components, the unique core of the regulating transformer lies in：
Tap switch: voltage regulating actuator (with or without excitation).
Control unit: it includes a controller (responsible for monitoring, comparison, and ordering) and a voltage measuring device (PT/CT), which together form a closed-loop control loop.
