ABB 1TNA900151R0200 Current Transformer KORC 4L 200/5

1TNA900151R0200

This alphanumeric string is a standard industrial part number that describes the transformer's key specifications. Here is a detailed explanation of what each part means:

1. Manufacturer & Product Line

• ABB: This is the manufacturer, a global leader in power and automation technologies.

• 1TNA: This is a common prefix for ABB's low-voltage instrument transformer product line.

2. Part Number & Description

• 900151R0200: This is the specific unique article number for this particular current transformer model. It's used for ordering and identifying the exact product in catalogs and price lists.

3. Core Technology

• KORC: This stands for Kernel Opening Rogowski Coil.

◦ Rogowski Coil: Unlike traditional iron-core current transformers, a Rogowski coil is an air-core, flexible toroidal coil. It measures the rate of change of current (di/dt) and integrates the signal to provide a proportional voltage output representing the current.

◦ Kernel Opening: This indicates the coil is split, allowing it to be opened and closed around the conductor without disconnecting the cable. This is a major advantage for installation.

4. Physical Configuration

• 4L: This denotes the physical shape and termination type. In this context, 4L typically means it is a rectangular, solid-body Rogowski coil with a fixed length and integrated electronics, often with a standard cable and connector output.

5. Electrical Specifications

• 200/5: This is the most critical specification.

◦ 200: The primary rated current is 200 Amperes. This is the nominal current flowing in the conductor you are measuring.

◦ 5: The secondary output is standardized to 5 Amperes for traditional CTs. However, for a Rogowski coil like the KORC, this is a bit of a legacy notation. The actual output is a low-level voltage signal (e.g., 100mV, 333mV, 1V) that is proportional to the 200A primary current. It's labeled 200/5 to indicate its measurement range is equivalent to a standard 200/5A CT.

Summary of Key Features and Advantages

Feature

What it Means

Benefit

Rogowski Coil (KORC)

Air-core, flexible/split design.

No Saturation: Can measure very high currents and complex waveforms without distortion.

Lightweight & Flexible: Easy to install, especially in tight spaces.

Safe: Opens to a dead short when disconnected, preventing dangerous high voltages.

Kernel Opening

Can be clipped around a conductor.

Retrofit-Friendly: Installation without shutting down the system (if designed for hot-swapping).

Easy Maintenance: Can be easily removed for calibration or replacement.

Ratio 200/5

Measures up to 200A primary current.

Standard for monitoring and protecting circuits with currents up to 200A.

ABB Brand

Made by a major manufacturer.

High quality, reliability, and widely available technical support and documentation.