What is a combined instrument transformer?

Combined instrument transformers are devices that, as their name suggests, combine the functions of a potential device and a current device inside, their application is, therefore, the same as that of the devices that comprise it, such as separate the measuring instruments, meters, relays, etc… from the circuit and reduce the currents and voltages to manageable values ​​proportional to the original primaries.

The combined transformers are specially designed to be installed in works that, due to space or cost, do not allow the equipment to be used separately.

Types of combined instrument transformers

The combined instrument transformers are classified into two categories of use, the first for outdoor use, which are characterized by their gray color that allows them to repel UV rays to preserve their internal temperature, and the combined transformers for indoor use designed with a brown color and a compact size to take up as little space as possible.

Combined instrument transformer design

The internal construction of a combined instrument transformer is similar to the construction of current and voltage transformers; this type of instrument transformer is designed with cycloaliphatic epoxy resin, which allows each part of the transformer to be isolated, forming a single piece that preserves the electrical and mechanical properties of the equipment for extended and high-precision operation.

The single-body designs with cycloaliphatic resin allow the combined transformer to withstand adverse weather conditions such as atmospheric discharges that can interrupt the operation of the equipment, as well as exterior and interior deterioration due to UV rays, preserving its internal temperature and its life. Useful.

Combined Instrument Transformer Applications

• Ideal for installation at metering points due to its very high accuracy class in both current and voltage.
• Suitable for discharge of high voltage lines and cables and capacitor banks.
• Excellent frequency response, ideal for wave quality monitoring and harmonic measurement.
• They are ideal for application at metering points for billing or metering and are designed for both exteriors and interiors.

Advantages of combined instrument transformers

Within the multiple advantages of combined instrument transformers we can find others such as:

• Reduction of the necessary space in the substation, transport and warehouse.
• Savings in structures, supports, connectors and installation time.
• Savings in revision and possible maintenance.
• Reduction of number of spare parts.
• Ideal for installation at metering points due to its very high accuracy class in both current and voltage.
• Suitable for discharge of high voltage lines and cables and capacitor banks.
• Excellent frequency response, ideal for wave quality monitoring and harmonic measurement.
• Resistance to high extreme weather conditions.

Current transformer

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