ABB |REX011 HESG323888R101 HESG448296| injection transformer block
Description
The ABB REX011 is an injection transformer block designed for use in generator protection systems. It works in conjunction with the REX010 injection unit to provide comprehensive stator and rotor earth fault protection, ensuring reliable operation and insulation supervision.
Features
- Application: Stator and rotor earth fault protection
- Compatibility: Requires REX010 injection unit
- Continuous Supervision: Insulation level and earth fault resistance
- Alarm/Tripping Values: Configurable in kΩ
Technical Specifications
-
Settings:
- Alarm Stage: 100 Ω to 25 kΩ (stator), 100 Ω to 20 kΩ (rotor)
- Delay: 0.2 s to 60 s
- Tripping Stage: 100 Ω to 25 kΩ (stator), 100 Ω to 20 kΩ (rotor)
- Reset Ratio: 110% for ≤10 kΩ, 120% for >10 kΩ (stator); 110% (rotor)
-
Accuracy:
- 0.1 kΩ to 10 kΩ: <±10%
- 0 to 100 Ω, 10 kΩ to 25 kΩ: <±20% (stator); 0 to 100 Ω, 10 kΩ to 25 kΩ: <±20% (rotor)
- Starting Time: 1.5 s
-
Functional Requirements:
- Stator Earthing Current: Max. I0 <20 A (recommended I0 = 5A)
- Stator Earthing Capacity: 0.5 µF to 6 µF
- Rotor Earthing Capacity: 200 nF to 1 µF
- Time Constant τ: RER × C = 3...10 ms
ABB |REX011 HESG323888R101 HESG448296| injection transformer block

ABB |REX011 HESG323888R101 HESG448296| injection transformer block
Description
The ABB REX011 is an injection transformer block designed for use in generator protection systems. It works in conjunction with the REX010 injection unit to provide comprehensive stator and rotor earth fault protection, ensuring reliable operation and insulation supervision.
Features
- Application: Stator and rotor earth fault protection
- Compatibility: Requires REX010 injection unit
- Continuous Supervision: Insulation level and earth fault resistance
- Alarm/Tripping Values: Configurable in kΩ
Technical Specifications
-
Settings:
- Alarm Stage: 100 Ω to 25 kΩ (stator), 100 Ω to 20 kΩ (rotor)
- Delay: 0.2 s to 60 s
- Tripping Stage: 100 Ω to 25 kΩ (stator), 100 Ω to 20 kΩ (rotor)
- Reset Ratio: 110% for ≤10 kΩ, 120% for >10 kΩ (stator); 110% (rotor)
-
Accuracy:
- 0.1 kΩ to 10 kΩ: <±10%
- 0 to 100 Ω, 10 kΩ to 25 kΩ: <±20% (stator); 0 to 100 Ω, 10 kΩ to 25 kΩ: <±20% (rotor)
- Starting Time: 1.5 s
-
Functional Requirements:
- Stator Earthing Current: Max. I0 <20 A (recommended I0 = 5A)
- Stator Earthing Capacity: 0.5 µF to 6 µF
- Rotor Earthing Capacity: 200 nF to 1 µF
- Time Constant τ: RER × C = 3...10 ms