Working conditions
The paper-oil insulated voltage transformers we offer exhibit excellent resistance to extreme weather conditions. They can be used reliably at altitudes above 1000 m, in seismically active areas, and in high-wind environments.
High-voltage voltage transformer in paper-oil insulation (72.5–525 kV)
Application
What are paper-oil insulated HV voltage transformers used for?Their primary purpose is to step down voltage in a given line and isolate measuring instruments, meters, or relays from the high-voltage power circuit. Structurally, transformers can accommodate multiple voltage windings, and their insulators housing can be made of porcelain or silicone.Our product line includes two main types of Arteche transformers: inductive and capacitive voltage transformers. They are ideal for installation at measurement points due to their very high accuracy class.
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Advantages
- Very high and consistent accuracy (up to 0.1%) stable throughout the transformer’s entire service life
- Excellent mechanical strength while maintaining compact dimensions
- Anti-resonance winding design
- Protected by active elements inside a metal tank, pressure relief valves, and short-circuit-resistant electrical connections
- Easy to transport, store, and install (with minimal visual impact)
- Hermetically sealed for complete water resistance
- Compliant with international standards (including IEC, IEEE, UNE, BS, VDE, SS, CAN, etc.)
- Each transformer is designed to pass all type tests required in the standards
- Environmentally friendly design using high-quality PCB-free oils and recyclable materials
- Maintenance-free throughout their service life
Electrical data
Accuracy class (according to IEC standards for 100 VA)
Class 0.2/3P
Accuracy class (according to IEC standards for 250 VA)
Class 0.5/3P
Accuracy class (according to IEEE standards)
0.3 (WXYZ), 1.2 (WXYZ, ZZ)
Maximum operating voltage (kV)
52–525 kV
Power frequency withstand voltage (kV)
95–680 kV
Lightning impulse withstand voltage (BIL) (kVp)
250–1,550 kV
Thermal load (VA)
1,500–3,500
Standard creepage distance (mm)
1,300–1,3125 mm
Operating conditions
Value
Operating temperature
-55°C to +55°C
Max. altitude above sea level
1,000 m
Mechanical data
Weight
450–1,300 kg
Downloads
Catalog of HV transformers
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"HV voltage transformers in paper-oil insulation from 72.5 to 525 kV"
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Table of contents:
What is a voltage transformer and what is it used for?
What exactly is the role of a voltage transformer? First and foremost, it steps down voltage in the power line to safe levels. It works similarly to current transformers, except that instead of current, it transforms the voltage signal from the primary circuit.
In practice, voltage transformers enable precise voltage measurement while isolating measuring devices and relays from power circuits. This allows for safe operation of instruments, protecting equipment from overloads and surges.
The high accuracy of voltage transformers is particularly important in networks where even a small phase angle error could affect measurement results and the operation of automation systems.
Design and operating principle
Each voltage transformer consists of a primary winding and a secondary winding wound on a common magnetic core. The primary winding is connected to the power network, and the secondary winding is used to connect meters, relays, or control devices.
During operation, the voltage in the secondary winding remains proportional to the voltage in the primary winding, enabling accurate measurement and analysis of network status. The transformer design minimizes phase angle error and ensures a constant accuracy class—in the case of Arteche solutions, as high as 0.1%. Such high precision is particularly important in applications requiring reliability and power supply stability.
What types of voltage transformers are there and what are they used for?
Depending on application and voltage level, modern voltage transformers differ in design and insulation technology. Our product line includes two main types of transformers, characterized by insulation type:
- Paper-oil insulation – a proven solution, resistant to changing conditions and a wide temperature range.
- Gas insulation – used in compact GIS installations, offering high integrity and compact dimensions.
Regardless of type, all voltage transformers manufactured by Arteche meet international standards (IEC, IEEE, VDE).
Voltage transformers are used in industry and in electrical transmission and distribution systems. Thanks to their compact design and weather resistance, they operate reliably over extended periods. They also offer flexible installation configurations.
How to choose the right voltage transformer?
Selecting a voltage transformer requires analysis of its operating conditions, network type, device function, and required accuracy. A properly selected model will not only ensure safe integration with measuring equipment but will also enhance the reliability of the entire installation.
Have questions about transformer selection? Contact our specialists—we'll discuss your project needs and recommend the appropriate protection solution.