ABB TA25DU – TA450DU Thermal Overload Relays Electronic Overload Relays

ABB TA25DU – TA450DU  Thermal Overload Relays Electronic Overload Relays

Brand background

ABB, as a leading global enterprise in the fields of power and automation technology, has a development history of over a hundred years. Since its establishment, ABB has always focused on technological innovation and is at the forefront of the industry in electrical equipment manufacturing, power system solutions, and more. Its products are renowned for their high quality, high reliability, and advanced technology, and have been widely used in energy, industry, transportation, and other fields in over 100 countries and regions worldwide. The TA25DU - TA450DU series current transformers inherit the technical advantages and quality standards of ABB brand, and are important achievements of ABB in the field of power measurement and protection equipment.

Product Overview

The ABB TA25DU – TA450DU series products are high-performance current transformer series launched by ABB. This series of products plays an important role in the measurement, protection, and control of power systems with accurate current measurement, reliable performance, and excellent stability. It can be widely used in various scenarios such as substations and industrial distribution systems, providing reliable data support and guarantee for the stable operation of power systems.

Specification parameters

Parameter category: TA25DU/TA450DU

Rated primary current: 25A - [X] A/450A - [X] A

Rated secondary current: 5A or 1A (optional)/5A or 1A (optional)

Accuracy level: Multiple accuracy levels available, such as 0.2S, 0.5S, 1P, 5P, etc./Multiple accuracy levels available, such as 0.2S, 0.5S, 1P, 5P, etc

Working temperature range: -25 ℃ -70 ℃/-25 ℃ -70 ℃

Protection level: IP20- IP67 (optional for different models)/IP20- IP67 (optional for different models)

Installation method

Multiple installation methods such as through type and bolt fixation/Multiple installation methods such as through type and bolt fixation

Core functions

1. High precision current measurement

This series of current transformers adopts advanced electromagnetic induction technology and precise manufacturing processes, which can measure the primary side current with high precision. Different accuracy levels of settings can meet the measurement accuracy requirements of different application scenarios such as metering, measurement, and protection in the power system. For example, the 0.2S level is suitable for high-precision electricity metering, ensuring the accuracy of electricity calculation; The 5P level is mainly used for relay protection devices to provide reliable current signals for protection actions.

2. Reliable electrical isolation

Through good insulation design, reliable electrical isolation between the primary and secondary sides has been achieved. Effectively prevent the high voltage on the primary side from causing harm to secondary equipment and personnel, and ensure the safe operation of the power system. At the same time, the high insulation level enables it to operate stably in harsh electrical environments and resist the effects of factors such as overvoltage and lightning strikes.

3. Wide range current adaptation

The TA25DU – TA450DU series covers a wide range of rated primary currents from 25A to 450A and above, and can adapt to the current measurement needs of power systems of different scales and various loads. Whether it is a small distribution line or the main power supply line of a large industrial enterprise, suitable models of current transformers can be found to ensure accurate monitoring and control of current.

4. Multiple protection and installation options

Provide multiple protection levels and installation methods, which can be flexibly selected according to the actual application environment and equipment layout. IP67 high protection products are suitable for harsh environments such as humidity and dust, such as outdoor substations, mines, etc; And multiple installation methods facilitate installation in switch cabinets and distribution cabinets of different structures, improving the applicability and installation convenience of the product.

5、 Working principle

The ABB TA25DU - TA450DU current transformer operates based on the principle of electromagnetic induction. When there is current passing through the primary circuit, a magnetic field is generated in the primary winding of the current transformer. Due to the electromagnetic coupling relationship between the primary winding and the secondary winding, the magnetic field will induce a corresponding current in the secondary winding. The secondary current is proportional to the primary current, and the proportionality coefficient is determined by the transformation ratio of the current transformer. By measuring and processing the secondary current, the magnitude of the primary current can be indirectly obtained, thereby achieving monitoring and control of the current in the power system. At the same time, the insulation structure inside the current transformer ensures electrical isolation between the primary and secondary sides, ensuring the safe operation of measurement and protection equipment.