Description
Product overview
The ABB REX010 HESG324426R0001 is part of a specialized protection arrangement for synchronous generators. In the REG216/REG316*4 system, the REX010 injection unit supplies the signal-generation stage used with the REX011 injection transformer block. Together, these components support stator and rotor earth-fault protection, including detection methods designed to cover the full stator winding rather than relying only on conventional fault detection near the winding terminals.
The unit’s configuration matters. ABB’s legacy documentation describes different auxiliary battery-voltage versions and selectable injection frequencies corresponding to one-quarter of the system frequency. It also specifies status indicators for readiness, overload, and disabled or interrupted injection. These details are important during maintenance because an indication that the unit is powered does not, by itself, confirm that the injection signal is present or that the complete protection scheme is functioning correctly.
When sourcing the ABB REX010 HESG324426R0001, verify the installed version and ordering code against the original equipment documentation. The available legacy manual uses the order number HESG324426M0001 plus configuration codes, while current supplier listings use the R0001 designation. Do not assume these codes are interchangeable without confirmation. A replacement should be checked alongside the REX011 transformer block, generator grounding arrangement, station battery supply, and REG216/REG316*4 protection configuration.
Key technical specifications
| Parameter | Details |
|---|---|
| Manufacturer | ABB |
| Model | REX010 |
| Requested part number | HESG324426R0001 |
| Product type | Injection unit for earth-fault protection |
| Compatible protection family | REG216 / REG316*4, subject to configuration |
| Associated unit | REX011 injection transformer block |
| Protection application | 100% stator and rotor earth-fault protection |
| Operating principle | Low-frequency signal injection |
| Auxiliary supply range | Family documentation lists 36–312 V DC; exact version must be verified |
| Documented battery versions | U1, U2, U3 |
| Injection frequency | Selected to correspond to one-quarter of the system frequency |
| Optocoupler input range | Version-dependent; documented ranges include 18–312 V DC |
| Status indicators | Ready, overload, and disabled/no injection |
| Controls | Enable/disable and reset, according to documented unit design |
| Terminal type | Phoenix HDFK, 4 mm² connection specification in legacy documentation |
| Mounting | REG316*4 housing arrangement |
| Communication protocol | Not identified as a network communication module |
| Current lifecycle | Legacy equipment; verify support and availability |
Specifications above are based on legacy REX010 documentation for the product family. They are not confirmation of the precise electrical configuration of the requested R0001 unit.
REX010 HESG324426R0001
Related products
These components belong to the same protection arrangement or are relevant when maintaining the installation:
- ABB REX011 — injection transformer block used with REX010.
- ABB REX011-1 — transformer variant for a specified stator grounding arrangement.
- ABB REX011-2 — transformer variant for injection at the generator terminals.
- ABB REG216 — generator protection system.
- ABB REG316*4 — generator protection relay system associated with the /011 arrangement.
These are related system components, not interchangeable replacements. The correct variant depends on the generator grounding method and the installed protection design.
Frequently asked questions
What does the do?
It generates injection signals for the transformer unit as part of the stator and rotor earth-fault protection scheme used with compatible REG216/REG316*4 systems.
Can it be used as a standalone protection relay?
No. It is an auxiliary injection unit within a larger protection arrangement. The associated protection system and transformer unit are required for the intended application.
Is 36–312 V DC suitable for every ?
That range appears in the family documentation, but individual versions have different supply characteristics. Check the original configuration code and nameplate before applying power.
Can any transformer be paired with this unit?
No. The transformer type must match the generator’s grounding and injection arrangement. Verify the existing transformer designation before ordering.
What should a supplier test?
Request documented power-up checks, READY/OVERLOAD/DISABLED indicator checks, injection-output verification, and functional checks with suitable test equipment. The scope should be stated explicitly; a basic power-on test does not establish that the generator protection scheme is ready for service.
What should be checked before replacing a failed unit?
Confirm the full order code, supply-voltage version, injection frequency, optocoupler input range, type, terminal connections, and the relevant REG216/*4 settings.
Procurement recommendation
For the ABB HESG324426R0001, prioritize configuration matching over a generic description of “ compatible.” Before purchasing, obtain a clear nameplate photograph, the complete ordering code, the documented supply-voltage version, and test results that confirm injection operation. For generator protection equipment, replacement acceptance should include verification of the complete protection scheme by qualified personnel before the generator returns to service.
