CR-20 Tap Changer

The CR-20 is designed for high-speed tap adjustment in voltage regulators. Its stepper motor direct-drive system enables precise and responsive voltage regulation, suited for dynamic distribution networks. Engineered for mechanical robustness and simplified maintenance, it complies with IEC, IEEE, and ABNT standards for applications up to 36.2 kV.

Role of Tap Changers in Voltage Control

The on-load tap changer adjusts the regulator winding ratio, enabling voltage regulation without service interruption. By selecting different winding taps, it raises or lowers voltage according to grid conditions, maintaining output within the range defined by the electronic controller. Motor-driven actuation ensures precise and automatic positioning in response to system variations.

CR-20 Actuation Mechanism

The CR-20 features a direct-drive actuation system, eliminating the spring energy storage stage used in conventional mechanisms.

This simplified architecture reduces moving parts and supports mechanical reliability with lower maintenance requirements.

A contact retention system ensures switching continuity even in the event of a momentary power interruption. When supply is restored, the switching sequence is automatically completed, preventing line opening and minimizing contact arcing.

Electrical and mechanical end-stop limits define precise operating positions and protect system integrity.

Tap transition time is approximately 0.35 seconds per step, with full travel from neutral to maximum position in approximately 5.6 seconds.

Control and Monitoring Signals

The CR-20 tap changer is equipped with nine micro-switches, a resistive position sensor, and an External Mechanical Indicator (EMI).

The operation counter generates an electrical pulse at each tap change, enabling lifecycle tracking based on total switching operations.

Neutral position and polarity signals provide operational status to the control system, supporting controlled and safe operation.

The resistive position sensor (potentiometric disc) provides electrical tap position feedback, ensuring synchronization between the tap changer and the electronic controller.

The External Mechanical Indicator provides real-time mechanical position indication, allowing position verification even when the regulator is de-energized.

Applications in Single-Phase Voltage Regulators

Power Distribution
Urban and rural feeders with voltage drop or load variation
Industrial Facilities
Critical processes requiring stable voltage control
Critical Systems
Applications requiring high service continuity
Distributed Generation
Networks requiring fast voltage response in systems with distributed energy resources

Technical Differentiators and Operational Reliability

Position synchronization between the tap changer and TSEA electronic controllers via resistive measurement
High-speed tap transition (approximately 0.35 seconds per step), supporting dynamic voltage response
Simplified mechanical architecture with reduced moving parts
Consistent switching precision over extended operating cycles
Compliance with IEC, IEEE, and NBR standards, meeting defined mechanical, thermal, and dielectric requirements
Engineering-led technical support throughout the asset lifecycle

Technical Specifications

Type:
On-load rotary tap changer for single-phase voltage regulators, direct-drive motor actuation
Operating Voltage:
Systems up to 36.2 kV
Current Rating:
668 A
Operation Time per Position:
0.35 seconds
Operation Time (Neutral to Maximum Position):
5.6 seconds
Operations Before Major Overhaul:
Up to 1,000,000 operations
Applicable Standards:
IEC 60076-21:2018
IEEE Std C57.15-2017
ABNT NBR 11809:1991
Mounting:
Integrated into TSEA voltage regulators

Frequently Asked Questions

What is the function of the TSEA CR-20 Tap Changer?

It enables on-load tap switching in single-phase voltage regulators, supporting uninterrupted voltage regulation.

What differentiates the CR-20 from other tap changers?

The CR-20 features a direct-drive actuation system with high-speed tap transition (approximately 0.35 seconds per step) and reduced mechanical complexity.
This design supports fast voltage response and simplified maintenance in dynamic network applications.

What differentiates the CR-20 from other tap changers?

What is the current rating of the CR-20?

Up to 668 A, according to applicable design and test parameters.

Does the CR-20 comply with applicable standards?

Yes. It is designed in accordance with IEC 60076-21, IEEE Std C57.15, and ABNT NBR 11809.