ABB 1TNA900241R0110 Current Transformer KORC 4SL 110/4

ABB 1TNA900241R0110 Current Transformer KORC 4SL 110/4

This is a Low-Power, Ring-Type Current Transformer (CT) from ABB, designed for metering and protection applications in electrical systems. It's part of the KORC series.

Part Number Breakdown: 1TNA900241R0110

This is ABB's unique internal catalog number. While the exact meaning of every digit isn't public, the structure is standard for ABB components.

• 1TNA: Typically indicates a product family or business unit within ABB (often for medium-voltage components and systems).

• 900241: The unique item code for this specific model.

• R0110: Often denotes a specific version or revision.

Technical Specifications: KORC 4SL 110/4

This is the most important part for understanding the transformer's capabilities.

1. KORC

• This is the product series name. The KORC series is a well-known range of cast-resin, window-type (ring-type) current transformers from ABB.

2. 4SL

• This indicates the accuracy class.

◦ The number (4) refers to the Accuracy Class for Metering. In this case, it's Class 4, which is suitable for standard revenue metering and load monitoring. (More precise meters might use Class 1 or 0.5).

◦ The letter (SL) refers to the Accuracy Class for Protection. 'S' stands for a high-accuracy class for protection, meaning it will perform accurately even during high fault currents. The 'L' likely specifies a particular limit for the composite error.

3. 110/4

• This defines the current ratio.

◦ 110: The primary rated current (Ipn) is 110 Amps. This is the current flowing in the main conductor that the CT is designed to measure.

◦ 4: The secondary rated current (Isn) is 4 Amps. This is the standardized output current that will be sent to the measuring instruments (ammeters, energy meters, protection relays).

◦ Therefore, the ratio is 110:4. For every 110A in the primary conductor, the CT will output 4A. When the primary current is at its rated 110A, the secondary current will be exactly 4A.

Key Features & Physical Characteristics

• Type: Window Type (Ring Type). The main power cable is passed directly through the hole in the center; there are no primary windings.

• Insulation: Cast in epoxy resin. This makes it robust, moisture-resistant, and suitable for harsh environments.

• Mounting: Typically mounted on a panel or DIN rail via a built-in bracket.

• Application: Used for:

◦ Electrical Energy Metering (for billing or monitoring)

◦ System Monitoring (ammeters, SCADA systems)

◦ Protection Relays (to detect overcurrent faults and trigger circuit breakers)

Summary

In simple terms, the ABB 1TNA900241R0110 KORC 4SL 110/4 is a robust, ring-shaped sensor that safely measures high current in a power line.

• It takes a high current (up to 110 Amps).

• It reduces it to a much lower, standardized, and safe current (4 Amps).

• It provides this signal to meters and protective devices with a defined level of accuracy for both normal and fault conditions.