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.

Key advantages

1. High precision and reliability

The use of high-quality magnetic materials and advanced manufacturing processes ensures the high precision and long-term stability of the current transformer. After strict quality inspection and testing, it can operate reliably in various complex power environments, reduce measurement errors and the probability of equipment failures, and provide strong guarantees for the stable operation of the power system.

2. Flexible product configuration

Rich specifications and diverse product models enable customers to flexibly configure according to specific application needs. Whether it is the requirements for measurement accuracy, rated current, protection level, or installation method, suitable products can be found in the TA25DU – TA450DU series to meet the personalized needs of different projects.

3. Easy to install and maintain

Reasonable structural design and standardized installation interfaces make the installation process of current transformers simple and convenient. At the same time, the product has good durability and stability, and requires minimal daily maintenance. Even when maintenance is required, quick inspection and repair can be carried out, reducing operation and maintenance costs and equipment downtime, and improving the operational efficiency of the power system.

4. Complies with international standards

Strictly follow international and domestic standards for design, manufacturing, and inspection to ensure that product quality and performance reach international advanced levels. It has good compatibility with other standard compliant power equipment, making it easy to integrate and apply in various power engineering projects, enhancing the competitiveness and applicability of the product in the global market.

Precautions

1. Installation requirements

Before installation, carefully check the product model and specifications to ensure they match the actual usage requirements. During the installation process, strictly follow the product installation instructions to ensure the correct connection of the primary and secondary windings and avoid polarity reversal. At the same time, ensure that the installation position of the current transformer is firm, meets the mechanical strength requirements, and prevents its performance from being affected by factors such as vibration.

2. Operation monitoring

During the operation of the current transformer, regularly check its appearance for signs of damage, overheating, and loose secondary circuit wiring. Monitor whether the output current on the secondary side is normal. If there is any abnormality, analyze the cause in a timely manner and take corresponding measures. Avoid open circuit operation on the secondary side, as it can generate high voltage at both ends of the secondary winding, endangering equipment and personnel safety, and potentially damaging the current transformer.

3. Maintenance and upkeep

Maintain the current transformer according to the prescribed cycle, including cleaning surface dust, checking insulation performance, etc. For products that operate for a long time, regular accuracy checks should be conducted to ensure measurement accuracy. If insulation aging, performance degradation and other problems are found, equipment should be replaced in a timely manner to ensure the safe and reliable operation of the power system.

Similar model supplement

1. ABB TA15DU series

Compared with the TA25DU – TA450DU series, this series has a smaller rated primary current range and is mainly suitable for small power systems or low current load circuits with a rated current of 15A - [X] A. Similar to some models in the TA25DU-TA450DU series in terms of accuracy level, rated output, and other parameters, but the overall performance indicators and product size are relatively small, making it more suitable for installation environments with limited space.

2. ABB TA600DU series

The TA600DU series has a higher rated primary current, ranging from 600A and above, and is suitable for current measurement and protection of large industrial enterprises, substation main transformers, and other high current circuits. We have strengthened the design in terms of insulation level and rated output to meet the operational requirements of higher current and voltage levels. At the same time, this series of products has been upgraded in intelligent monitoring function, which can provide more device status information, making it easier to achieve remote monitoring and intelligent operation and maintenance.