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 ECOTAP® VPD® III 30D-24 :
1. Installation horizontally below the transformer cover.
2. Installation horizontally on the transformer side wall.
3. Installation vertically on the transformer side wall.
What variants of the ECOTAP® VPD® III 30D-24 are available?
The only variance in the ECOTAP® VPD® III 30D-24 lies in the transition resistors, which depend on the step voltage and the rated current. The specific variant required must be determined before shipment.
How is the ECOTAP® VPD® connected to the transformer’s tap winding?
The connection contacts of the ECOTAP® VPD® III 30D-24 must be connected to the tap winding connecting leads and on-load tap-changer take-off leads by crimping, ensuring they are not subject to mechanical stress.
What must be considered when drying the transformer?
The motor drive and control unit must not be dried. During the drying process, the temperature should not exceed 135 °C.
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.
Do the screws on the motor drive always need to be tightened securely?
As soon as the transformer is exposed to the elements, even for a short time, the motor drive should be placed on the sealing module and secured with the seven supplied M6 screws at a torque of 6 Nm. This hast o be done to to ensure IP66 protection.
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.
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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.
