Description
Product Overview
The ABB REX010 HESG324426R1 is identified by its REX010 model designation as part of ABB’s generator earth-fault protection equipment family. In a generator protection installation, the REX010 supplies a coded low-frequency signal that is coupled into the protected circuit through the appropriate REX011 injection transformer. The associated protection relay processes the measurement to detect insulation faults that conventional protection functions may not cover near the generator neutral point. ABB’s REG316*4 documentation describes the REX010 and REX011 as components of a coordinated stator and rotor earth-fault protection arrangement.
This equipment is intended for generator protection applications, including power stations and industrial facilities with their own generation assets. Its role differs from that of a conventional protection relay: the REX010 generates the injection signal, while the associated protection system evaluates the relevant measurements and determines the protection response. Correct operation therefore depends on the relay version, injection-transformer configuration, generator grounding arrangement, and the REX010’s ordered electrical options. The documented family includes auxiliary DC supply options spanning 36–312 V DC, along with selectable frequency and optocoupler-input configurations. Those options must be matched to the installed system rather than assumed from the model name alone.
For procurement, the exact suffix matters. The supplied identifier HESG324426R1 does not match the commonly documented HESG324426M... ordering format found in the available technical literature. Before approving a replacement, compare the physical nameplate, complete order code, wiring connections, and the original protection-system documentation. Ask the supplier to confirm the condition, test procedure, and applicable electrical configuration. A similar model designation alone is not sufficient evidence that a unit is a direct replacement.
Product Introduction
Generator earth faults close to the neutral point can be difficult to detect using conventional protection alone. The ABB provides the low-frequency injection function used in compatible generator protection schemes, helping the associated relay monitor the protected insulation system.
For a replacement involving HESG324426R1, verify the complete order code, DC supply range, frequency option, and optocoupler input configuration. These details can determine whether the unit is suitable for the existing REG216 or REG316*4 installation.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | |
| Supplied part number | HESG324426R1 |
| Product category | Generator earth-fault protection injection unit |
| Protection application | Stator and rotor earth-fault protection schemes |
| Operating principle | Coded low-frequency signal injection |
| Associated protection relays | REG216 / REG316*4, subject to system configuration |
| Associated injection transformer | REX011 variant selected for the grounding arrangement |
| Auxiliary power supply | 36–312 V DC across documented family options |
| Frequency options | 50 Hz or 60 Hz system configurations documented |
| Optocoupler input options | 18–36 V DC, 36–75 V DC, or 82–312 V DC, depending on order configuration |
| Installation | Protection-system-specific mounting; verify the original assembly |
| Communication protocol | No standard digital communications protocol verified for this unit |
| Operating temperature | Exact value not verified for the supplied suffix |
| Protection rating | Not verified |
| Condition | Confirm with supplier |
| Test documentation | Request unit-specific test evidence |
The electrical options above describe the documented product family, not a confirmed configuration for the exact HESG324426R1 suffix.
REX010 HESG324426R1
Related Products
- ABB REG216 — Generator protection relay used in compatible injection-based earth-fault protection schemes. Confirm the system version and wiring requirements.
- ABB REG316*4 — Generator protection relay family documented with the injection unit and REX011 transformer.
- ABB REX011 — Injection transformer block that couples the signal into the protected circuit. The correct variant depends on the generator grounding arrangement.
- ABB REX011-1 — Injection-transformer variant used for a particular secondary-injection arrangement at the generator star point. Verify the complete configuration before substitution.
- ABB -2 — Injection-transformer variant associated with secondary injection at the generator terminals. It is not interchangeable with other variants without checking the circuit design.
- ABB REG670 — A generator protection relay family mentioned by some supplier references in connection with applications. Confirm support for the specific installation with the applicable ABB documentation.
- ABB REX012 — An auxiliary filtering component cited in supplier documentation for certain protection configurations. Determine whether it is required from the original system design.
Frequently Asked Questions
Q1: What does the ABB do?
It generates a coded, low-frequency injection signal for compatible generator earth-fault protection schemes. The associated injection transformer and protection relay work with this signal to monitor insulation faults.
Q2: Is HESG324426R1 the same as HESG324426M0001?
That equivalence has not been established. ABB technical literature documents ordering codes in the HESG324426M... family. Ask the supplier to verify whether is a valid variant, legacy identifier, or another marking before ordering a substitute.
Q3: Can I replace the while the generator is running?
Do not assume it can be hot-swapped. The participates in a generator protection circuit, so any replacement procedure must follow the approved plant outage, isolation, and protection-bypass requirements. Arrange appropriate protection coverage before removing the unit.
Q4: What DC supply does the require?
The documented product family includes 36–312 V DC auxiliary supply options. The correct option depends on the unit’s order configuration and the station battery supply. Check the actual nameplate and ordering documentation before energizing it.
Q5: Does the work with any transformer?
No. The transformer variant must match the injection method and generator grounding arrangement. ABB documentation distinguishes transformer variants for different injection configurations.
Q6: What should I verify when purchasing a replacement?
Confirm the full part number, nameplate markings, DC supply option, frequency selection, optocoupler input range, and compatibility with the installed relay and transformer. Request clear photographs and unit-specific inspection or functional-test records.
Q7: Is a new-surplus unit guaranteed to be original and functional?
No. “New surplus” describes a claimed condition, not proof of authenticity or successful operation. Request traceable identification, photographs of the actual unit, documented testing, and written warranty and return terms. For a generator protection component, condition and configuration should be verified before installation.
