ABB 1TNA900111R0100 Current Transformer KORC 4L 100/1

1TNA900111R0100

ABB 1TNA900111R0100 is a 100/1 dual-winding current transformer designed for 12kV medium-voltage systems. It provides a 0.5-class metering winding and a 5P10-class protection winding. Its most notable feature is the 1A rated secondary current, making it particularly suitable for applications with long secondary circuit conductors or for use with measurement and protection devices designed for 1A input.

Product Overview

• Brand: ABB

• Full Model Number: 1TNA900111R0100

• Product Series: KORC 4L

• Type: Window-Type / Through-Type Current Transformer

• Primary Purpose: Installed in metal-enclosed medium-voltage switchgear (e.g., ABB UniGear) for system current measurement and electrical protection.

• Key Features: Compact structure, high accuracy, and strong reliability.

Detailed Technical Parameters

Parameter Category

Parameter Item

Detailed Specification

Basic Information

Full Model Number

1TNA900111R0100

Product Series

KORC 4L

Description

Window-Type Current Transformer

Primary Side Parameters

Rated Primary Current (Ipr)

100 A

Installation Method

Through-Type

Secondary Side Parameters

Rated Secondary Current (Isr)

1 A

Output

2 independent cores and secondary windings (Dual Winding)

Core 1 (C1)

Accuracy Class

0.5

Rated Burden (Burden)

5 VA (or similar, refer to analysis below)

Function

For Precision Measurement

Core 2 (C2)

Accuracy Class

5P

Rated Burden (Burden)

10 VA (or similar, refer to analysis below)

Accuracy Limit Factor (ALF)

10

Accuracy Limit Current

10 x Ipr = 1000 A

Function

For Relay Protection

General Parameters

Frequency

50/60 Hz

Rated Insulation Level

Suitable for 12kV Systems

Standard

Complies with IEC 61869, etc.