Choose A Current Transformer for Motor Protection: External BDCTAD-00-020 Is More Worry-Free

Current transformers are essential for motor protection these days—especially external ones, such as the BDCTAD-00-020, a dedicated external current transformer for motor protectors. This has become increasingly common in the industry. Previously, people favored internal current transformers, installed alongside the protector. While this seemed simple, it proved problematic over time. External current transformers, on the other hand, offer significant advantages in flexibility, installation costs, and ongoing maintenance. Today, we’ll discuss why external current transformers, especially the BDCTAD-00-020, are a good choice for motor protection.

What do current transformers do? Internal ones can be quite troublesome.

To be honest, the purpose of current transformers in motor protection is to monitor current. When the motor rotates, the current is measured, measured, and stable. This data is then transmitted to the motor protector. The protector then determines whether to issue an alarm or shut down the motor. Traditional built-in current transformers are like welded-on protectors. Initially, they’re configured to a specific motor’s specifications. If the motor model changes, or if production capacity increases and a larger motor is needed, the entire protector must be replaced—what a hassle. External current transformers, however, are separate and offer a perfect solution.

Maximum flexibility: External current transformers are convenient for motor replacement and cabinet installation.

Let’s first discuss flexibility. External current transformers are truly convenient. With built-in current transformers, you must specify the motor’s rated current when you purchase them, and then configure the transformer’s ratio accordingly. If the motor’s current changes, the built-in transformer can’t be adjusted, requiring the entire protector to be replaced. However, external current transformers like the BDCTAD-00-020 offer different ratio options. If motor parameters change, you can simply replace the protector with a corresponding external current transformer without having to change the protector. Furthermore, internal current transformers must be squeezed into the protector housing. If the electrical cabinet is crowded with wires and components, installation can be extremely difficult and can even affect measurement accuracy. External current transformers don’t present this problem; simply find an empty spot and secure them. Regardless of the chaotic layout of the cabinet, they can be installed securely and accurately measure current.

Financial Considerations: Installing External Current Transformers Can Save Money

Further calculations reveal that installing external current transformers is actually more economical. If the specifications of an internal current transformer are incorrect, or if the motor is later modified, reordering a new protector with an internal current transformer is not only expensive, but also requires waiting for delivery. However, external current transformers like the BDCTAD-00-020 are standardized and compatible with several motor protectors, eliminating the need for custom designs for each motor. Installation is also much easier; workers don’t need to remove the wires inside the protector; they simply tighten a few screws and connect the wires, saving time and reducing labor costs compared to internal installation. If an old factory is upgrading its system and the existing current transformer is still functional, instead of replacing it entirely, adding an external current transformer can save significant money—especially for plants with many motors, potentially saving tens of thousands of yuan annually.

No Worries About Maintenance: External current transformers are quick to replace and easy to check.

External current transformers offer significant maintenance relief. If a built-in current transformer breaks, you have to disassemble the entire current transformer, shutting down the motor. This can take half a day or even an entire day, disrupting production. However, external current transformers, like the BDCTAD-00-020, are modular. To inspect or replace them, simply disconnect the wiring and remove the transformer. This can be done in minutes without requiring the motor to be shut down for extended periods. They’re also easy to clean and inspect without opening the current transformer casing, freeing workers from the confines of a tight space, making them much safer. Even remotely monitoring the status of current transformers is easy—external current transformers can be connected to the SCADA system for real-time data viewing, allowing you to detect problems before they break down and repair them.

Reliable Performance: The BDCTAD-00-020 External Current Transformer is Accurate and Durable

The BDCTAD-00-020 external current transformer is not only flexible, cost-effective, and easy to maintain, but also offers reliable performance. Made of high-quality materials and meticulously crafted, it measures current with higher accuracy than many internal current transformers. Furthermore, since it doesn’t need to be nestled within the protector, it’s immune to electromagnetic interference from the protector, resulting in even more accurate data. Accurate current data is crucial for motor protection; a single error could result in a delayed alarm and potentially a motor burnout. Furthermore, external current transformers aren’t subject to the heat and vibration of the protector, allowing them to last longer than internal ones. Some can last up to five or six years without replacement. With fewer replacements, maintenance costs are naturally lower.

Many companies have switched to external current transformers, and the feedback has been positive—some report reduced motor downtime, while others report significant annual maintenance savings. Whether you’re installing a new motor or retrofitting an existing system, choosing an external current transformer specifically designed for motor protectors like the BDCTAD-00-020 will save you time and effort compared to built-in current transformers.

Confused about which one to choose? Contact us to find a current transformer solution.

If you’re struggling with choosing a current transformer for motor protection, contact us directly. We’ve been manufacturing current transformers for years. Whether it’s for high-load motors, explosion-proof motors, or retrofitting existing systems, we can provide you with the right solution, saving you the hassle of searching for the right solution. After all, choosing the right current transformer reduces motor problems and ensures smooth production. Inquire now:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

Yoyik offers various types of power plants spare parts for steam turbines, generators, boilers as below:
thermocouple WRNK2-833/NN/K
SENSOR POSITION LVDT ZDET-400B
potentiometer is a transducer TDZ-1F INPUT:1-5VDC OUTPUT:24VDC
Current and voltage type transformers LJB1-5A/10V
Eddy Current Sensor PR6422/104-020
Bo mạch đấu nối in/out van ME8.530.024
Speed Transducer ZS-03 L=80
Steam turbine bolt electric heating rod ZJ-22(T)(R)
proximity sensor types CWY-DO-812502
SWITCH PRESSURE HS70595
Water pressure pulsation monitor with pressure transmitter SYM-1
LANCE STICK TINY OIL XDZ-1-1935
Collision Switch XCK-L106
thermocouple WRKK2-291
Eddy Current Sensor PR6423/001-110
sensor TD-1 150S
Bolt electric heating rod DFJ760W35Z
CPU 1214C(DC/DC/DC) 6ES7214-1AG40-0XB0
Eddy Current Sensor PR6423/002-031
LVDT FOR HP Quick closing Valves C9231122
sensor TDZ-IE-31
magnetic proximity switch TM0393-A17-B00 0-100um
Electrode RDJ-2000
temperature controller thermocouple WREK2-230
industrial displacement sensor DET700A
LVDT Main Steam Stop Valve HTD-100-3
pressure controller QYJ-10Kpa
LVDT Sensor 7000TDG
intelligence Hand Operator NPDF-D11F1
FLOW SWITCH ZNJC09010101
Eddy Current Sensor PR6422/001-140