Definition & Structure
An oil-immersed transformer is a common power equipment that performs critical tasks such as voltage conversion and power distribution in electrical grids. It is widely used in urban/rural power grid upgrades, industrial/mining applications, combined transformers, and prefabricated substations.
Key components include:
1.Core: Laminated from high-permeability silicon steel sheets to form a closed magnetic circuit.
2.Windings: Made of copper or aluminum wire, serving as conductive loops wound around the core.
3.Tank: Houses insulating oil and supports other components.
4.Conservator (Oil Expension Tank): Compensates for oil volume changes.
5.Breather: Prevents moisture ingress.
6.Pressure Relief Device (Explosion Vent): Releases excessive internal pressure.
7.Radiators: Enhance heat dissipation.
8.Bushings: Provide external insulation for terminals.
9.Tap Changer: Adjusts voltage ratio.
10.Buchholz Relay: Detects internal faults.
11.Temperature Gauge & Oil Purifier: Monitor and maintain oil quality.
12.Oil :Serves as the primary insulation and cooling medium.
Performance Features
1.High Efficiency & Energy Savings:
Laminated core with minimal air gaps reduces losses and noise.
Near-circular core cross-section improves three-phase balance and lowers harmonic distortion.
2.Enhanced Reliability:
Oil penetrates silicon steel layers, damping noise.
Sealed construction protects insulation from environmental factors.
3.Strong Load Adaptability:
Adjusts input/output currents to meet varying load demands.
Cooling Methods
1.Oil-Natural Air-Natural (ONAN): Relies on natural oil convection.
2.Oil-Natural Air-Forced (ONAF): Adds fans to cool tank and pipes.
3.Oil-Forced Air-Forced (OFAF): Uses pumps to circulate oil through external coolers.
Insulation Structure
1.Internal Insulation:(1)Main Insulation: Oil-paper barriers isolate windings from grounded parts/other windings.
(2)Longitudinal Insulation: Separates sections within the same winding.
2.External Insulation: Bushings insulate terminals from ground/each other.
nsulation Structure
1.Internal Insulation:(1)Main Insulation: Oil-paper barriers isolate windings from grounded parts/other windings.
(2)Longitudinal Insulation: Separates sections within the same winding.
2.External Insulation: Bushings insulate terminals from ground/each other
Operational Parameters
1.Temperature Limits:
Top oil temperature ≤ 90°C (85°C recommended for longevity).
Alarm triggers at 80°C.
2.Overload Capacity:
Permits 1.1-1.2× rated current during emergencies.
Monitor load/temperature post-alarm; reduce load if necessary.
Advantages.
Oil-immersed transformers are suitable for various power grid scenarios, featuring excellent structure and performance. They efficiently convert and distribute electrical energy, ensuring stable and secure power supply.
Product Parameter:
| Product Name |
Product Model |
Product Feature |
Product Parameter |
| Oil-immersed transformer |
S11/S13/S20/S22 |
1. Energy conservation and environmental protection
2. Low load loss
3. Resistance to lightning strike
4. Strong short-circuit resistance |
Type:Power Transformer
Material:silicon steel sheet
Frequency:50/60HZ
Winding Material:Copper/ Aluminum
Input Voltage:10kv-110kv
Output Voltage:440v 400v 480v
Phase:ThreeThree
Certification:ISO9001
Rated capacity:30-3000kva
Cooling Method:ONAN
Usage:Power Electronic
Shape : coil |
Main Products
Company Profile
Foshan Zongcheng Electric Co., Ltd . Mainly produces S13, S20, S22 series 10KV, 20KV, 35KV oil-immersed power transformers; SH15 amorphous alloy transformer; SCB12, SCB13, SCB14, SCB18 series 10KV, 20KV, 35KV epoxy resin cast dry type power transformers; SCBH15 amorphous alloy transformer; SGB series non-encapsulated dry power transformer, low loss power transformer such as on-load voltage regulation; Combined American type, box-type substation, etc. The technical standard strictly adopts the international GB10941-2013; GB/T6451-2015, GB/T1094.11-2007/GB/T10228-2015 standards.
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