Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Primary Application | Medium voltage feeder and AC motor protection |
| Mounting | 4U panel mount, flush fit |
| Front Panel Rating | IP54, rear terminals IP20 |
| Protection Functions | 3-stage overcurrent, directional overcurrent, earth fault, undercurrent |
| Recording | High-speed disturbance recorder, fault event logging |
| Communication | IEC 60870-5-103, Modbus RTU, optional Ethernet |
| Auxiliary Supply | 24–250 V DC / 80–250 V AC |
| Frequency Range | 50 Hz / 60 Hz, field selectable |
| Measurement Accuracy | ±0.5% for current and voltage |
| Additional Features | Circuit breaker condition monitoring, THD power quality measurement |
| Supported Earthing Systems | Solidly earthed, resonant earthed, isolated neutral |
Product Introduction
The ABB REX521GHHPSH50G is a legacy multifunction IED built for medium voltage distribution feeders and circuit-breaker controlled motor loads. It combines protection, breaker control, metering, and event recording in one compact unit. This hardware variant supports directional overcurrent and configurable earth fault logic. It works as primary feeder protection or backup protection for transformers and HV line schemes, and stores fault waveform data for post-event analysis.
REX521GHHPSH50G
REX521GHHPSH50G
REX521GHHPSH50G
REX521GHHPSH50G
REX521GHHPSH50G
Application Scenarios & Field Experience
Many older radial distribution substations run on legacy protection hardware with limited fault recording and no built-in breaker wear tracking. Simple overcurrent relays cannot capture waveform data, so root cause analysis after a transient fault takes hours. This IED solves that by logging every fault event and tracking breaker operation count.
- Utility distribution substations: 10kV–35kV radial outgoing feeders, requires auto-reclose for overhead lines.
- Cement plant switchgear: Medium voltage large motor feeders, overcurrent and locked rotor protection.
- Water treatment facilities: Incoming MV bus feeders, backup protection for station transformers.
- Industrial mine sites: Isolated-neutral cable networks, sensitive earth fault detection.
In my experience, a manufacturing plant had a REX521GHHPSH50G lock up after a switching transient corrupted its application settings. The team pulled the spare unit, loaded the saved parameter set via the local HMI, and verified binary input/output mapping before closing the breaker. The feeder returned to service in 40 minutes, and the disturbance record from the failed unit confirmed the root cause was a voltage transient on the auxiliary supply.
Standard Operating Procedure (SOP) for Quality Control
- Visual & Origin Inspection: Check OEM nameplate, serial number, housing condition, and factory labels. Reject units with cracked display screens or bent terminal pins.
- Live Rig Testing: Apply secondary injection test signals, confirm all protection stages trip at set thresholds, verify binary input/output actuation.
- Firmware Verification: Capture firmware version and application configuration ID. Match against the variant’s factory configuration sheet.
- ESD-Safe Packaging: Seal the relay in anti-static shielding bag, add foam bracing, pack into rigid carton, mark for ESD controlled handling.
Frequently Asked Questions (FAQ)
Q1: Can REX521GHHPSH50G integrate into the same substation automation system with Relion 615 series IEDs? A: Yes, but protocol mapping must be handled carefully. REX521 uses IEC 60870-5-103 by default, while Relion 615 uses IEC 61850. You will need protocol translation or a mixed system configuration. Q2: What warranty applies to this ABB REX521GHHPSH50G? A: We offer a 12-month warranty. Warranty covers hardware defects under normal operating conditions. Damage from miswiring, overvoltage transients, or incorrect parameter downloads is excluded. Q3: Is this specific hardware variant in stock? A: Stock availability changes daily. Confirm lead time before scheduling an outage window. This exact GHHPSH50G variant is a configured build and may not always be ready for immediate shipment. Q4: Can I load a configuration file from a different REX521 variant onto this unit? A: Do not load configs from different hardware variants. Mismatched I/O mapping will cause false trips or unresponsive outputs. Use only the configuration built for the GHHPSH50G hardware layout. Q5: Can I remove this relay while the feeder is energized? A: Do not remove the unit unless CTs are shorted and secondary circuits are isolated. Open CT circuits produce dangerous high voltage and can trigger an unintended system trip.
