If you visit a factory that manufactures switchgear today and compare it to a factory from ten years ago, you will notice a significant difference: The usable space inside the switchgear is noticeably smaller.

Modern low-voltage power distribution systems no longer serve solely to distribute electricity. Engineers today must integrate meters, communication modules, monitoring devices, protective relays, and sometimes even IoT gateways into a single distribution box.

Therefore, every millimeter inside the MCCB switchboard is of crucial importance.

This raises an interesting question:

Do we still need three independent current transformers for three-phase current measurement, or is there a better solution?

The space problem that nobody has addressed.

Many electrical engineers focus on the specifications of circuit breakers, the dimensions of wires, and the specifications of instruments, but the real challenge in the assembly process is often the lack of installation space.

If three independent current transformers are installed around each phase conductor, many problems quickly arise:

• More connection points are needed.
• The circuits have become more complex.
• The assembly time has increased.

Maintenance will become increasingly complicated in the future.

In large projects, these small defects can quickly add up.

This applies particularly to commercial buildings, industrial plants and solar power distribution systems, where many devices have to be accommodated in a limited space.

Why are more and more panel manufacturers choosing to use computed tomography technology in the design process?

In recent years, many switchgear manufacturers have gradually switched to the use of integrated three-phase current transformers.

The reason is simple.

The installers do not need to install three separate current transformers; one module with three measuring channels is sufficient.

This method can immediately simplify panel construction.

The cable routing is much neater now.

The installation process is faster.

Most importantly, however, valuable space is saved in the control cabinet, which can then be used for installing other equipment.

For manufacturers producing hundreds of panels per month, even a slight reduction in assembly time can have a significant impact on production efficiency.

A concrete example of an industrial distribution system.

For example, as part of the plant expansion project, the installation of a three-phase electricity meter downstream of the compact circuit breaker (MCCB) is planned.

The traditional solution is to use three separate CT scanners.

At first glance, it seems very simple.

However, as soon as the engineers begin laying cables, installing instruments, and placing communication modules, the available space is quickly used up.

Typically, integrated three-phase current transformers can solve this problem, as all three phases are measured in one device.

The components on the control panel are arranged more clearly, and installers spend less time adjusting cable positions during the debugging process.

Why is compatibility with compact circuit breakers (MCCBs) important?

Not all current transformers are designed for use in compact circuit breakers (MCCBs).

Many standard current transformers offer good electrical performance, but require additional installation space that is difficult to find in compact control cabinets.

For this reason, manufacturers of power distribution systems are increasingly opting for modern transformers that are specifically designed for installations with compact circuit breakers (MCCBs).

A suitable current transformer (CT) simplifies installation while ensuring measurement accuracy and system reliability.

This is particularly important in industrial projects, where hundreds of compact circuit breakers (MCCBs) may be installed in a factory.

Which musical notes are most commonly used today?

The requirements vary depending on the application area, but different ratios often occur in industrial and commercial projects:

• 100/5A
• 200/5A
• 250/5A
• 400/5A
• 600/5A

In large power distribution networks, capacities of over 1000 A are becoming increasingly common due to rising energy consumption and increasing device density.

Typically, engineers choose the turns ratio of a current transformer based on the expected operating current, rather than the maximum theoretical load.

A CT scanner of the right size can provide higher measurement accuracy and more reliable monitoring data.

How is the solar energy monitoring project progressing?

The development of energy management systems in Southeast Asia has created a new demand for compact power metering solutions.

The factory is under pressure to reduce energy costs.

CCTV systems are being installed more and more frequently in commercial buildings.

Accurate production and consumption data are needed for the implementation of solar energy projects.

In such applications, engineers often look for ways to simplify installation while ensuring reliable current measurement.

Built-in three-phase current transformers fit perfectly with this trend, as they simplify wiring and optimize the available space in the distribution box.

Should we abandon traditional installation methods for CT scanners?

These three independent current transformers are currently in perfect working order and will continue to be used in many projects.

However, the requirements for modern electrical systems have changed.

The size of the panels is getting smaller and smaller.

Video surveillance systems are becoming increasingly complex.

Installation efficiency is becoming increasingly important.

For many switchboards that use compact circuit breakers (MCCBs), the integration of three-phase current transformers is a convenient way to save space, simplify installation, and improve the overall layout of the switchboard.

Given the boom in industrial plants, commercial buildings and renewable energy projects in Southeast Asia, this design approach is expected to see wider application in the coming years.

Compay：HEYI Electrical Co., Ltd.
Brand: HEYI/ASCT
Contact: Bethy
E-mail: heyi@heyiele.com             
Tel: 86-13968747975

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