ECOTAP® VPD® III
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Compact on-load tap-changer for Voltage Regulating Distribution Transformers (VRDT)
Keep your distribution grid’s voltage stable within a defined range with ECOTAP® VPD® III, the advanced on-load tap-changer (OLTC) for voltage regulation. Designed for high-performance applications, it combines a wide control range with fine-step adjustment –ideal for public, industrial, and renewable-integrated distribution grids. ECOTAP® VPD® is a highly economical solution. The tap-changer is completely maintenance-free throughout the transformer’s entire service life while the Control unite is designed for plug and play replacement.
ECOTAP® VPD® III delivers precise voltage control for distribution grids. Its robust design supports autonomous regulation without manual intervention, while integrated communication options enable seamless connectivity to smart grid and SCADA systems. Maintenance-free operation ensures low lifecycle cost.
Compact yet powerful, with ECOTAP® VPD® III operators will benefit from a solution that meets today’s dynamic grid requirements while remaining cost-effective and reliable throughout the transformer’s entire service life.
Precise Voltage Regulation
- Wide control range with fine-step adjustment for accurate performance
- Autonomous voltage regulation without manual intervention
- Ideal for public, industrial, and private distribution grids
Maintenance-Free & Cost-Efficient
- No servicing required throughout the transformer’s entire lifecycle
- Reduces operating costs and simplifies asset management
- Highly economical solution for long-term grid planning
Flexible Integration
- Communication-ready for SCADA and smart grid environments
- Compact design for easy installation and planning
- Adjustable alarm limits and flexible recording intervals
Robust & Future-Ready
- Engineered for dynamic grid conditions and renewable integration
- Durable construction for reliable long-term performance
- Designed to meet evolving network requirements
What you get:
- 1 VPD III On-load-tap-changer
- 1 box with ECOTAP® VPD® Control control unit
Documents
| Name | Category | Date | Size | Download |
|---|---|---|---|---|
ECOTAP VPD (24 kV)-Short Overview |
Flyer | 27.03.2025 | 3.0 MB |
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|
ECOTAP VPD (24kV) |
Operating Instruction | 04.07.2025 | 5.0 MB |
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ECOTAP VPD MD and C Motor-drive unit and control unit |
Operating Instruction | 11.07.2025 | 5.0 MB |
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ECOTAP VPD MD and C Operating Instructions |
Commissioning Instruction | 17.10.2024 | 5.0 MB |
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FAQ - Frequently Asked Questions
Which installation positions are possible at the transformer?
There are three ways of installing the on-load tap-changer (OLTC):
1. Installation horizontally below the transformer cover.
2. Installation horizontally on the transformer side wall.
3. Installation vertically on the transformer side wall.
Is it possible to modify the transition resistors after delivery?
No. ECOTAP® VPD® has glued connections, therefore a later modification is not possible..
Does the ECOTAP® VPD® allow single bridging regulation?
No, ECOTAP® VPD® has a linear regulation. Single bridging or double bridging is a regulation used with OCTCs.
Why should the underside of the transformer cover not be painted in the area near the sealing module?
When the underside of the transformer is painted, the finish might get damaged and start crumbling because of being squeezed when attaching the seal flange to the transformer cover, which might lead to corrosion and a rotting effect. When only a primer is applied to the surface, this can be avoided.
Is communication available?
ECOTAP® VPD® has signaling contacts for error and ready. Beyond these signals communication is available via MODBUS RTU, further communication options are available.
How long does a tap-change take?
A switching operation takes approx. 420 milli-seconds. All three seconds an operation can be initiated.
Problem with the installation? No problem at all!
Discover our how-to videos for many products.
Welcome to our how-to videos section, your ultimate guide to easy installation, commissioning and maintenance. Our videos provide you with clear and understandable instructions specifically designed to make it easier for you to use our products.
These videos complement our operating instructions and provide additional visual support for a seamless implementation of your projects. Take a look at our videos and make your life easier.
Dissolved Gas Analysis (DGA)
Download the DGA Application Guide and protect your transformers from unexpected failures
Our free Application Guide provides information on how Dissolved Gas Analysis (DGA) can help detect transformer failures early.
Learn what problems are caused by gases in the transformer oil and how continuous monitoring of hydrogen, carbon monoxide and moisture using an online DGA sensor can help prevent costly transformer downtime.
With your newfound knowledge, you can improve your equipment monitoring and minimize the risk of downtime and costly repairs.
