115kV 132kV to 22kV 120MVA 125MVA Electric Substation Power Transformer
115kV 132kV to 22kV 120MVA 125MVA Electric Substation Power Transformer
1. Product Description
The 115kV / 132kV step-down to 22kV 120MVA and 125MVA electric substation power transformer is a high-capacity, grid-grade heavy-duty power conversion device tailored for regional power transmission and substation power distribution systems. Manufactured in strict accordance with IEC 60076 international power transformer standards and national grid technical specifications, this high-voltage power transformer is specially designed for 115kV and 132kV high-voltage transmission networks to complete stable step-down conversion to 22kV medium-voltage power supply systems, serving as the core power conversion equipment in main substations and regional power grid hubs.
This series covers mainstream large-capacity specifications including 120MVA and 125MVA, matching the high-load operation demands of urban trunk power grids, industrial cluster power supply and new energy grid-connected substations. Adopting mature oil-immersed cooling and insulation structure, the equipment supports ONAN/ONAF/ODAF multi-cooling modes, which can automatically adjust heat dissipation efficiency according to actual operating load. The high and low voltage windings use high-purity oxygen-free copper wire with vacuum pressure impregnation process, which effectively improves overall insulation performance and mechanical stability. Different from small and medium distribution transformers, this 115kV 132kV substation transformer focuses on long-term full-load stable operation and strong short-circuit resistance, fully adapting to continuous high-power operation scenarios of large-scale power substations.
All units undergo strict partial discharge testing, short-circuit impact testing and temperature rise testing before leaving the factory, with partial discharge value controlled within 5pC to ensure low-loss and low-noise operation throughout the service cycle. The overall structure adopts fully sealed anti-corrosion oil tank design, which can resist outdoor high temperature, humidity, salt fog and corrosive environments, greatly reducing later operation and maintenance costs. As a mainstream high-capacity step-down transformer for 115kV and 132kV power grids, it is widely recognized in the industry for stable voltage conversion, low operating loss and strong environmental adaptability.
2. Core Product Features
2.1 High-Capacity Stable Voltage Conversion
Featuring professional 115kV/132kV to 22kV voltage grade matching, this 120MVA and 125MVA high voltage power transformer realizes precise and stable step-down transmission of high-voltage grid electric energy. It effectively solves the problems of voltage fluctuation and power attenuation in long-distance power transmission, maintains constant output voltage of 22kV medium-voltage system, and provides reliable voltage guarantee for subsequent secondary power distribution and terminal power consumption. The equipment supports long-term full-load and slight overload continuous operation, with extremely strong load impact resistance, and can cope with peak power consumption impact of regional power grids.
2.2 Ultra-Low Loss and Energy-Saving Operation
Optimized with high-performance oriented silicon steel sheet core and multi-layer segmented winding structure, the transformer greatly reduces no-load loss, load loss and magnetic flux leakage loss. Compared with traditional old-fashioned substation transformers of the same capacity, the power loss is significantly reduced, which effectively improves the comprehensive energy utilization rate of the power grid and reduces long-term grid operation energy consumption. Whether it is 120MVA conventional power supply configuration or 125MVA high-load customized configuration, all performance indicators meet international energy-saving standards, helping power grid enterprises achieve energy conservation and emission reduction goals.
2.3 Excellent Insulation and Safety Performance
The whole machine adopts multi-stage composite insulation structure and global vacuum oil injection process, with uniform internal insulation strength and no dead corners. It has strong lightning impulse resistance and over-voltage resistance, and can effectively resist instantaneous voltage surge and grid fault impact in 115kV and 132kV high-voltage transmission lines. The fully sealed oil tank structure completely isolates external moisture and dust, avoids insulation aging and breakdown caused by long-term operation, and greatly improves the overall operation safety and stability of the substation system. The product is equipped with perfect over-temperature, over-current and short-circuit protection functions to prevent equipment failure and grid accidents.
2.4 Strong Environmental Adaptability and Durability
Designed for outdoor substation harsh working conditions, the shell adopts heavy-duty anti-corrosion electrostatic spraying process, which can adapt to high temperature, severe cold, high humidity, coastal salt fog and industrial corrosive environments. The flexible multi-cooling mode can automatically adapt to seasonal temperature changes and load changes, ensuring stable heat dissipation in high-temperature summer full-load operation and low-temperature winter stable start-up. The mechanical structure is firm and reliable, with strong seismic performance and deformation resistance, and can maintain stable operation for a long time in complex working conditions, with a design service life of up to 35 years.
2.5 Intelligent and Low-Maintenance Design
This electric substation power transformer supports the installation of online monitoring systems for oil temperature, oil level, partial discharge and operating current, which can realize real-time remote monitoring of equipment operating status and early warning of potential faults. The fully sealed structure avoids frequent oil replenishment and maintenance, greatly reducing daily operation and maintenance workload and manual maintenance costs. The standardized modular design is convenient for on-site installation, commissioning and later maintenance and replacement of accessories, improving the overall operational efficiency of the substation.
3. Core Purpose
The core purpose of the 115kV 132kV to 22kV 120MVA 125MVA substation power transformer is to undertake high-capacity voltage step-down and power distribution tasks in regional high-voltage power grids. It converts 115kV and 132kV high-voltage electric energy transmitted by regional trunk lines into standard 22kV medium-voltage electric energy that meets industrial and municipal power distribution standards, realizing safe, efficient and stable power energy transmission and transfer between high-voltage transmission network and medium-voltage distribution network.
In regional power grid operation, this high-capacity power transformer undertakes the core function of grid voltage grade conversion and power load distribution. It balances the power supply pressure of regional power grids, solves the problem of insufficient power supply capacity and unstable voltage in peak power consumption periods, and ensures the balanced and orderly distribution of electric energy in urban areas, industrial parks and new energy bases. At the same time, it can effectively isolate grid faults, prevent high-voltage line faults from spreading to medium-voltage distribution systems, and protect the safe operation of terminal power consumption equipment and regional power grid systems.
For new energy grid-connected projects, the equipment can stabilize the grid-connected voltage of large-scale photovoltaic and wind power stations, solve the problem of unstable output voltage of new energy power generation, realize efficient grid-connected power transmission of new energy, and improve the grid absorption capacity of clean energy. It is an indispensable core power equipment for optimizing regional power grid structure and improving power supply reliability.
4. Application Scenarios
4.1 Regional Urban Main Substation Projects
115kV 132kV to 22kV 120MVA and 125MVA power transformers are the key supporting equipment for urban central substations and regional hub substations. They are mainly used for step-down power supply of urban trunk power grids, undertaking high-power power supply tasks of urban residential clusters, commercial centers, municipal facilities and public buildings. The high stability and large load capacity of the equipment fully meet the 24-hour uninterrupted power supply demand of modern cities, and effectively guarantee the reliability of urban municipal power supply.
4.2 Large Industrial Park and Heavy Industry Power Supply
This high-capacity substation power transformer is widely used in large industrial zones, chemical industrial parks, steel and metallurgy bases, mining industrial clusters and other heavy-load industrial scenarios. Industrial production has the characteristics of large power load, frequent load fluctuation and long-term continuous operation. The 120MVA and 125MVA super-large capacity can fully bear the centralized power consumption demand of large industrial equipment and production lines, and the strong overload and anti-fluctuation performance ensures the stable operation of industrial power supply systems and avoids production shutdown losses caused by voltage instability.
4.3 New Energy Centralized Power Station Grid Connection
It is perfectly applicable to centralized large-scale photovoltaic power stations, onshore and offshore wind power plants and energy storage power station grid-connected supporting projects. New energy power generation has the characteristics of intermittency and volatility. This 115kV/132kV step-down 22kV power transformer can stabilize new energy output voltage, complete efficient power collection and voltage conversion, realize safe and standardized grid connection of new energy power, greatly improve the grid-connected efficiency and power utilization rate of clean energy, and support the construction of new power systems.
4.4 Regional Power Grid Renovation and Expansion Projects
With the continuous expansion of urban scale and industrial power demand, traditional low-capacity substation equipment is difficult to meet the growing power load demand. This 120MVA and 125MVA high-capacity power transformer is widely used in old regional power grid renovation, substation capacity expansion and power grid upgrading projects. It effectively improves the power supply capacity and transmission efficiency of regional power grids, solves the problems of insufficient power supply and voltage drop in old power grids, and adapts to the rapid growth of social power consumption demand.
5. FAQ (Frequently Asked Questions)
Q1: What is the difference between 120MVA and 125MVA 115kV/132kV to 22kV substation transformers, and how to select the correct model?
The core difference between the 120MVA and 125MVA models lies in the maximum continuous load capacity and peak overload tolerance. The 120MVA transformer is suitable for conventional regional substations and industrial parks with stable daily load and small peak fluctuation, which can meet the conventional high-power power supply demand with higher cost performance. The 125MVA model is an upgraded high-load version, with stronger peak overload resistance and longer full-load operation cycle, more suitable for new energy grid-connected substations, rapidly developing urban power grids and heavy industrial zones with growing power load. In actual selection, users need to comprehensively consider the current basic load and future load growth reserve of the substation, and it is recommended to reserve 10%-20% capacity margin to avoid long-term full-load overload operation.
Q2: What are the key installation and commissioning requirements for 115kV 132kV high voltage substation power transformers?
This series of high-capacity power transformers belongs to grid-grade high-voltage electrical equipment, and must be installed and commissioned in strict accordance with high-voltage power engineering specifications. First, the substation foundation needs to meet the load-bearing and anti-seismic standards for large transformer installation, with perfect drainage and ventilation facilities. Second, professional vacuum oil injection and static standing treatment must be carried out after equipment in-place to eliminate internal air bubbles and ensure insulation performance. In addition, complete lightning protection, grounding and short-circuit protection devices need to be configured, and partial discharge test, temperature rise test and voltage withstand test must be completed before grid-connected operation. Professional high-voltage electricians are required for on-site commissioning to ensure that all electrical performance indicators meet grid access standards.
Q3: What are the common operating faults and daily maintenance tips for 120MVA/125MVA substation power transformers?
Common operating faults of high-capacity oil-immersed substation transformers mainly include abnormal oil temperature rise, oil leakage, abnormal operating noise, partial discharge exceeding the standard and unbalanced voltage output, most of which are caused by long-term overload operation, radiator blockage, insulating oil aging and poor sealing. In daily maintenance, users need to regularly check the transformer oil level, oil quality and radiator cleanliness to ensure unobstructed heat dissipation; regularly test insulation resistance and grounding performance to eliminate hidden insulation dangers; check the tightness of wiring terminals and sealing parts to prevent oil leakage. It is necessary to avoid long-term overload operation and regular sampling and testing of insulating oil. Timely replacement of deteriorated insulating oil can effectively extend the service life of the equipment and ensure the long-term stable operation of the substation system.
