The application prospects of dry vacuum on-load tap changers in smart grids

I. Introduction

With the development of smart grids and the increasing proportion of new energy access, the requirements for voltage stability and power supply quality in the power grid are getting higher and higher. The Dry-Type Vacuum On-Load Tap Changer (V-OLTC), as an important voltage regulating device for modern transformers, has broad application prospects in the smart grid due to its high-precision voltage regulating capability, environmental protection and safety characteristics, and intelligent control potential. This article will conduct a systematic analysis from aspects such as technical principles, the demands of smart grids, application advantages, and future development trends, providing references for power system engineers.

Ii. Overview of Dry Vacuum On-Load Tap Changer

1. Definition and Function

The dry vacuum on-load tap changer is a voltage regulating device that can achieve tap switching under load conditions. It completes contact switching through vacuum arc extinguishing technology, ensuring safe and stable operation under high voltage and high current conditions. The main functions include:

With load voltage regulation to ensure the stability of grid voltage;

Reduce transformer losses and improve power supply efficiency;

Realize remote or intelligent control to adapt to complex power grid environments.

2. Core features

Vacuum arc extinguishing technology: Rapid arc extinguishing, reducing contact loss;

Dry insulation: Oil-free, environmentally friendly, safe, and with low maintenance costs;

High-precision voltage regulation: Precise tap position, stable voltage regulation;

Intelligent interface: Compatible with SCADA systems and intelligent substation monitoring systems, it enables remote control and automatic regulation.

Iii. The Demand for Voltage Regulation Equipment in Smart Grids

1. Voltage stability requirements

In the smart grid, the connection of new energy sources such as wind power and photovoltaic power to the grid causes frequent voltage fluctuations. High-precision pressure regulating equipment can:

Quickly respond to load changes;

Keep the user-end voltage within the set range;

Improve the operational efficiency of electrical equipment and reduce energy consumption.

2. Automation and remote monitoring

The smart grid requires equipment to support remote monitoring and automatic regulation.

The dry vacuum on-load tap changer can be seamlessly connected to the intelligent substation control system through a digital control interface.

3. Energy conservation and environmental protection requirements

Traditional oil-immersed voltage regulating switches have leakage and maintenance problems.

The dry vacuum on-load tap changer adopts dry insulation and vacuum arc extinguishing, reducing energy waste and environmental pollution.

Improve the operational efficiency of the system and achieve the energy-saving goals of the power grid.

Iv. Advantages of Dry Vacuum on-load Tap Changers in Smart Grids

1. High efficiency and energy saving

Vacuum arc extinguishing reduces contact loss and lowers energy consumption.

Precise tap switching reduces energy loss caused by voltage fluctuations;

In large-capacity transformers, the overall energy-saving effect is obvious.

2. Intelligent control capability

It can achieve remote monitoring and automatic pressure regulation.

Combined with the intelligent dispatching system, it supports load forecasting, demand response and optimized dispatching.

Realize dynamic regulation of grid voltage and enhance the flexibility of grid operation.

3. Safety and environmental protection

Dry insulation, oil-free, reducing the risk of fire and pollution;

Vacuum arc extinguishing ensures safe and reliable switching under load.

Compact in structure and modular, it is easy to install and maintain.

4. Adapt to complex load environments

In the smart grid, the load fluctuates greatly and the output of new energy is unstable.

The dry vacuum on-load tap changer can respond quickly and improve system stability.

Support frequent tap operation to reduce equipment loss caused by abnormal voltage.

V. Analysis of Application Prospects

1. Urban smart distribution network

The urban distribution network has a dense load and frequent voltage fluctuations.

The dry vacuum on-load tap changer can achieve remote automatic voltage regulation, ensuring the power supply quality for residential and commercial users.

Improve the intelligent management level of the power grid.

2. Industrial parks and high-load scenarios

Industrial loads change frequently, and high voltage stability is required.

The use of dry vacuum on-load tap changers can reduce equipment wear and tear and improve production efficiency.

Support intelligent monitoring and load optimization adjustment to reduce energy consumption costs.

3. New energy grid connection scenarios

The integration of new energy sources such as wind power and photovoltaic power has led to significant voltage fluctuations and obvious peaks and troughs.

The dry vacuum on-load tap changer achieves smooth voltage control through intelligent regulation.

Improve the utilization rate of new energy and reduce the risk of unstable power grids.

4. Smart Microgrids and distributed energy systems

Microgrids have high requirements for voltage regulation accuracy and fast load fluctuations.

The dry vacuum on-load tap changer can be linked with the energy storage system and the load management system to achieve adaptive voltage regulation.

Ensure the stable operation of microgrids and the efficient utilization of energy.

Vi. Future Development Trends

1. Intelligence and digitalization

Integrate intelligent sensors and remote communication modules to achieve all-round status monitoring;

Support big data analysis and predictive maintenance to enhance equipment reliability;

Deeply integrate with smart substations and distribution automation systems to achieve autonomous voltage regulation.

2. High reliability and long-life design

Optimize the contact material and mechanical structure to reduce the failure rate;

Enhance environmental adaptability to high-temperature, humid and polluted environments;

Extend the service life of equipment and reduce operation and maintenance costs.

3. Energy Conservation and green Development

Continue to optimize vacuum arc extinguishing and dry insulation technologies to enhance energy efficiency;

Promote the application of environmentally friendly materials to reduce the impact on the environment;

Achieve the energy-saving goals of the smart grid and operate in coordination with renewable energy.

Dry vacuum on-load tap changers, with their advantages of high-precision voltage regulation, vacuum arc extinguishing, dry environmental protection and intelligent control, are becoming important equipment in the construction of smart grids. It has demonstrated broad application potential in scenarios such as urban power distribution, industrial loads, new energy grid connection, and microgrids. With the development of intelligent, digital and energy conservation and environmental protection technologies, dry vacuum on-load tap changers will play an increasingly crucial role in power grid automation and efficient energy conservation, providing stable, efficient and green power guarantee for modern smart grids.