110kV Substation Power Transformer Solution

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Product Description

Product Attributes
Product Feature
Product description

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Overview

Product Attributes

Model No.: S18-110kV Series

Brand: HENGFENGYOU

Application: Substation power Transformer

Phase: Three-phase

Rated Voltage: 110kV (Customizable 110kV–121kV)

Rated current: 50A – 1000A

Frequency: 50Hz / 60Hz

Degree of protection: IP56

Standard: IEC60076, ANSI/IEEE, SABS，SASO，EN，NF，GB1094

Certificate: ISO 9001, CE, IEC Compliant

Shell Material: Steel

Origin: China

Packaging: Sea-worthy Plywood Case / Steel Frame

Delivery Time: 60-90Days

Product Feature

Product description

I. Selection & Specification Strategy for 110kV Substation Transformers
The selection of the main power transformer is the cornerstone of substation design, requiring a comprehensive balance of load characteristics, environmental conditions, fire safety requirements, and Total Cost of Ownership (TCO).
1. Type and Cooling Method
Mainstream Selection: Three-phase double-winding or three-winding oil-immersed power transformers are recommended. For 110kV applications where site space is limited or transportation is difficult, modular transformers complying with IEC 60076 are available. Unit capacities typically range from 25MVA to 200MVA.
Cooling Systems: Depending on the load, ONAN (Oil Natural Air Natural) or ONAF (Oil Natural Air Forced) are standard. For urban centers or underground substations with stringent fire/explosion requirements, SF6 Gas-insulated Transformers or Natural Ester (Vegetable Oil) Transformers are ideal due to their non-flammable and eco-friendly properties.
2. Capacity, Efficiency, and Standards
Capacity Planning: Based on grid simulation and load growth forecasts. A typical configuration includes dual main units (e.g., 25MVA, 40MVA, 50MVA, or 63MVA) to ensure the N-1 redundancy criterion.
Energy Efficiency: Equipment must meet global efficiency mandates to reduce operational losses. Hengfengyou Electric products comply with EU Tier 2, US DOE 2016, GOST, and SABS efficiency levels.
Technical Standards: Fully compatible with international standards: GB, ANSI/IEEE, EN, NF, GOST, SABS, etc.
3. Environmental Adaptation
Corrosive/Sandy Environments: Enhanced external insulation and corrosion protection up to C5M class (ISO 12944). We recommend HGIS (Hybrid Gas Insulated Switchgear) to replace open-air equipment in extreme conditions.
High-Altitude Applications: For altitudes exceeding 2000m, specialized designs for dielectric clearance and temperature rise limits are implemented.
Low-Noise Requirements: For residential areas, we utilize optimized core structures and vibration-damping technology to ensure noise levels remain well below regulatory limits.
4. Technical Specification Table (Typical Parameters)

Parameter	Technical Indicator (Example)
Rated Voltage	110±8×1.25% / 10.5 kV (Customizable)
Rated Capacity	25,000 ~ 63,000 kVA
Frequency	50Hz / 60Hz
Vector Group	Dyn11 / Ynd11
Cooling Method	ONAN / ONAF

II. Design and Installation Plan
1. Layout of Distribution Equipment
110kV substation transformers should preferably be paired with Indoor GIS (Gas Insulated Switchgear) or Outdoor HGIS to minimize the footprint and maintenance workload. Connections between the transformer and GIS are typically made via GIB (Gas Insulated Busbars) or high-voltage cables.
2. Key Installation Processes
Positioning and Assembly: Utilize heavy-duty cranes for main body placement, followed by the installation of radiators, bushings, and the oil conservator.
Vacuum Oil Filling & Hot Oil Circulation: Perform vacuuming (<13Pa) before injecting qualified insulating oil. Hot oil circulation is then conducted to remove moisture and gases from the insulation materials, significantly enhancing dielectric strength.
Standing and Venting: After filling, the transformer must stand for 24–48 hours, with multiple venting cycles to ensure no residual air remains.
3. Grounding and Lightning Protection
Equip the neutral point with a complete protection assembly (disconnector, surge arrester, and discharge gap).
Ensure the tank and neutral point are reliably grounded with a resistance meeting design specifications.
III. Commissioning and O&M Plan
1. Handover Testing
Insulating Oil Test: Breakdown voltage, moisture content, and Gas Chromatography (DGA).
Winding Tests: DC resistance, turns ratio, polarity, and vector group verification.
Dielectric Strength: Partial Discharge (PD) Test and Applied Voltage Test.
2. System Commissioning and Energization
Protection Relay Coordination: Complete set transmission tests for differential and backup protection.
Inrush Current Impact Test: Perform five successive no-load energizations (switching impulses) to verify insulation integrity and ensure protection relays do not misoperate due to magnetizing inrush current.
3. Intelligent O&M
Online Monitoring: Deployment of Dissolved Gas Analysis (DGA), winding temperature monitoring, and PD monitoring systems.
Remote Surveillance: Integration with SCADA systems to support "unattended substation" operation modes.
IV. Solution Summary Table

Dimension	Core Content	Recommended Scheme / Standard
Selection	Type, Cooling & Capacity	3-Phase Oil-immersed, ONAN/ONAF, 25-63MVA
Efficiency	Loss Control	Compliant with GB 20052 Level 1/2 or Tier 2
Layout	Structure & Equipment	110kV Indoor GIS or Outdoor HGIS
Installation	Process & Workflow	Strict Vacuum Filling, Hot Oil Circulation, Venting
Testing	Insulation & Protection	PD Test, 5 Impact Energizations, Relay Coordination
O&M	Intelligence	DGA Online Monitoring & Smart Temp Control

In summary, a 110kV substation main transformer solution must adhere to the core principles of "High Reliability, Low Loss, and Intelligence." From precise selection in the early stages to rigorous process control during installation and digitalized O&M after commissioning, every step directly impacts grid security. Hengfengyou Electric leverages international manufacturing standards and advanced monitoring technologies to provide full life-cycle protection, ensuring your substation assets remain efficient and stable for over 30 years.
V. FAQ (Frequently Asked Questions)
Q1: How do ONAN and ONAF cooling modes switch in a 110kV transformer?
A: Transformers typically operate in ONAN (Natural) mode under low loads to minimize noise and self-consumption. When the load reaches 70%-80% of rated capacity or the oil temperature hits a set threshold, the control system automatically starts the fans to switch to ONAF (Forced) mode.
Q2: Why are five impact energization tests required before commissioning?
A: This is done to verify the transformer's insulation strength against switching overvoltages and to ensure that the differential protection relays do not trip falsely due to the magnetizing inrush current.
Q3: What are the advantages of Vegetable Oil (Natural Ester) over Mineral Oil?
A: Natural Esters have a fire point above 300°C (compared to ~160°C for mineral oil), offering superior fire safety. They are also biodegradable, environmentally non-toxic, and can extend the life of the insulation paper.
Q4: What special designs are needed for high-altitude (e.g., >3,000m) 110kV transformers?
A: Due to thin air, heat dissipation efficiency and air insulation strength decrease. We increase the creepage distance of bushings and apply a temperature rise correction to prevent overheating.
Q5: What indicators does Dissolved Gas Analysis (DGA) monitor?
A: It monitors gases like Hydrogen (H2), Methane (CH4), Acetylene (C2H2), etc. Changes in the concentration of these gases allow for the early detection of internal thermal or electrical faults.
Q6: What is the typical design life of a 110kV transformer?
A: Under standard operating and maintenance conditions, the design life is 30 years. With intelligent monitoring and high-quality maintenance, the actual service life can often exceed 40 years.

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