Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of power transformer with oltc in China. If you're going to wholesale durable power transformer with oltc made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
Zhejiang Hengli Electrical manufactures Power Transformers with OLTC (On-Load Tap Changer) for power systems where supply voltage needs to be adjusted without interrupting the load. Unlike an off-circuit tap changer, an OLTC allows the transformer ratio to be changed while the transformer remains energized and supplying power. This makes it suitable for networks with fluctuating voltage, changing load demand or long distribution feeders.
For utility and industrial projects, the OLTC is selected according to the transformer rating, voltage class, required regulation range, step voltage, current and control scheme rather than treated as a standard accessory. Zhejiang Hengli Electrical can configure the transformer and OLTC as an integrated solution based on the project's electrical specifications.
Main Parameters
|
Item |
Typical Configuration |
|
Transformer Type |
Oil-Immersed Power Transformer |
|
Rated Capacity |
Custom according to project |
|
HV Voltage |
6 / 10 / 11 / 33 kV or customized |
|
LV Voltage |
0.4 / 0.415 kV or customized |
|
Frequency |
50 / 60 Hz |
|
Phase |
3 Phase |
|
Cooling |
ONAN / ONAF as required |
|
Winding |
Copper or Aluminum |
|
Tap Changer |
OLTC |
|
Tap Range |
Customized, commonly specified around ±5% to ±10% |
|
Standards |
IEC or project requirements |
Final ratings, tap positions, regulation range and OLTC type are determined by the transformer specification and system requirements.
Construction and OLTC Configuration
The transformer consists of a magnetic core, HV/LV windings, insulation system, oil-filled tank, bushings, cooling equipment and protection accessories. The OLTC is integrated with the tapped winding and operated through a motor-drive mechanism. Depending on the project, the tap changer can use conventional or vacuum switching technology. Modern vacuum OLTC designs are also available for applications requiring reduced switching wear and specific maintenance arrangements.
The control system can be configured for automatic voltage regulation (AVR) or manual operation. For utility projects, remote monitoring and control interfaces can also be specified according to the substation automation system.
Key Features & Advantages
Continuous voltage regulation
The OLTC changes the effective transformer ratio while the transformer remains in service, helping maintain the required bus or feeder voltage without planned power interruption.
Designed around the actual grid condition
Tap range, step voltage, rated current and tapping location can be selected according to the project's voltage fluctuation and load profile.
Suitable for variable-load systems
The transformer can respond to changing network conditions, making it suitable for substations, industrial plants and renewable-energy-connected grids.
Integrated control and protection
Motor drive, position indication, voltage regulation control and required protection functions can be coordinated with the transformer design.
Factory testing before delivery
Routine transformer tests and OLTC operation checks can be arranged before shipment, with technical documentation and test reports supplied according to the agreed specification.
Typical Application
Power Transformers with OLTC are commonly used in utility substations, industrial substations, renewable-energy grid connections, commercial power networks and large distribution systems where voltage stability is important. OLTC-equipped transformers are also used in modern networks to support changing loads and renewable integration.
For example, a 1250 kVA, 11/0.415 kV oil-immersed transformer with OLTC can be configured for an industrial distribution system experiencing significant incoming-voltage fluctuations. Instead of shutting down the transformer to change taps, the OLTC can adjust the ratio during operation, helping maintain a more stable LV supply.
FAQ
Request a Technical Datasheet & Quotation
Send your transformer capacity, voltage ratio, OLTC regulation range and application to Zhejiang Hengli Electrical. Our engineering team can provide a project-specific configuration, technical datasheet and quotation.
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