ABB REX011 Injection Transformer Unit

Product Description

Configured for low-frequency signal coupling in ABB REG216 and REG316*4 generator protection systems, the ABB HESG323888R101 / HESG448296 (REX011 Injection Transformer Unit) transfers the coded injection signal into the protected generator circuit. It operates with the REX010 injection unit during standstill, start-up, run-down, and full-load conditions.

Suffix Breakdown & Model Matrix

The supplied data identifies two part numbers for the REX011 unit:

The supplied information does not define a separate functional meaning for the individual characters within HESG323888R101 or HESG448296. Therefore, no suffix interpretation is assigned.

Hardware Specifications

ABB Generator Earth Fault Signal Injection

The REX011 transformer couples the coded low-frequency signal from the REX010 injection unit into the generator winding. This arrangement supports earth fault detection for both stator and rotor circuits.

The injection path remains active across different generator operating states. Consequently, the protection principle does not depend only on generator rotation or normal load conditions.

The integrated Type P8 contactor provides a protective switching function. When an earth fault produces a high current condition above 5 A, the contactor isolates the injection circuitry from the fault path.

Frequently Asked Questions

Q: Which protection systems use the ABB REX011?
A: The supplied data identifies ABB REG216 and REG316*4 numerical generator protection systems as compatible systems.

Q: What is the function of the REX011 transformer?
A: The REX011 couples the coded low-frequency injection signal from the REX010 injection unit into the generator circuit for stator and rotor earth fault protection.

Q: What protects the injection circuitry during a high-current earth fault?
A: The REX011 includes a Type P8 contactor that isolates the injection circuitry when the earth fault current exceeds 5 A.

Field Installation Guidelines

Install the REX011 according to the applicable ABB REG216 or REG316*4 protection-system documentation. Confirm the unit identification and wiring assignments before connecting the injection circuit.

Connect the REX011 to the associated REX010 injection unit and generator protection circuit using the specified terminal assignments. Do not substitute terminal functions based solely on physical similarity.

Route the injection and protection wiring separately from high-current power conductors where the installation permits. This arrangement limits unwanted electromagnetic coupling into the low-frequency measurement circuit.

Use the specified Phoenix-type high-capacity terminals for the primary earthing and coupling connections. Verify terminal tightness and conductor seating before energizing the protection circuit.

Before commissioning, verify the REX011 wiring, REX010 interface, generator connection, and Type P8 contactor circuit. Also confirm the earth fault protection circuit operates according to the applicable ABB protection-system test procedure.

Other Attributes

• Series: Advant OCS/800xA
• Country of Origin:  Germany/Sweden/Finland
• Lead Time: In Stock, 2 Working Days

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